WO2008062825A1

WO2008062825A1 - Insert/detachable type cutting tool and insert

Info

Publication number: WO2008062825A1
Application number: PCT/JP2007/072534
Authority: WO
Inventors: Kazuya Yamazaki; Kenji Sugawara
Original assignee: Mitsubishi Materials Corporation
Priority date: 2006-11-22
Filing date: 2007-11-21
Publication date: 2008-05-29
Also published as: JPWO2008062825A1; JP2009066746A

Abstract

In an insert/detachable type cutting tool, a mounting seat has a base and a clamp piece, the base is provided with an insert-mounting base surface and a contact wall, and the clamp piece is provided with a pressing protrusion protruding toward the base and two locking protrusions protruding beyond the pressing protrusion upward toward the base. The insert has a polygonal flat plate shape, and has a nose portion protruding toward one direction when viewed from a side facing that polygonal surface and provided at its side ridge with the above cutting edge, locking portions provided on the opposite sides of the base end of the nose portion to be locked with the above locking protrusions respectively, and a contact portion kept in contact with the contact wall while facing a side opposite to the extension direction of the nose portion.

Description

Specification

Insert detachable cutting tool and insert

Technical field

[0001] The present invention relates to an insert detachable cutting tool that is optimal for copying a workpiece, and an insert used therefor.

This application claims that priority has been claimed for Japanese Patent Application No. 2006—315353, filed on Nov. 22, 2006, and Japanese Patent Application No. 2007—213538, filed on August 20, 2007. This is incorporated here.

Background art

As an insert constituting an insert detachable cutting tool used for copying, for example, as described in Patent Document 1, a triangular plate, a rhombus plate or a parallelogram plate is formed, and its corner portion protrudes. It has been proposed to form a nose portion and provide a cutting edge on the side ridge portion of the nose portion. In this insert, since the tip angle of the nose portion is configured to be small, the force S can be applied by moving the nose portion so as to follow the outer shape of the work material.

The insert is provided with a through-hole penetrating in the thickness direction at the center thereof, and is configured to be attached to the insert detachable cutting tool using the through-hole.

[0003] By the way, when performing copying / processing, the nose portion is moved along the outer shape of the work material to perform cutting, so that the cutting resistance acts on the nose portion in all directions. For this reason, for example, when a clamp screw or the like is passed through and fixed to the through hole, the insert may rotate around the through hole portion. Also, if the mounting rigidity of the insert is low! /, If the cutting resistance causes the insert to sway, cutting cannot be performed with high dimensional accuracy.

[0004] On the other hand, Patent Document 2 discloses an insert attachment / detachment in which the mounting rigidity is increased by forming uneven portions on the side surface of the insert and the wall surface of the mounting seat to which the insert is attached, and fitting them together. -Type cutting tools have been proposed! In this insert detachable cutting tool The insert to be used has a through-hole penetrating in the thickness direction at the center thereof, and the tip of the clamp piece of the mounting seat is engaged with the through-hole portion so that the insert is pulled in. Concave and convex portions are fitted.

Patent Document 1: Japanese Utility Model Publication No. 56-132009

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-261883

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the insert detachable cutting tool disclosed in Patent Document 2, the insert is clamped by fitting the uneven portions provided on the side surface of the insert and the wall surface of the mounting seat. In order to improve the rigidity, it is necessary to secure a contact area between the side surface of the insert and the wall surface of the mounting seat. Here, if the side surface of the insert is enlarged, the protruding length of the nose portion is shortened, and the copying process cannot be performed sufficiently. On the other hand, when the protruding length of the nose portion is increased, the mounting rigidity of the insert is reduced.

[0006] Further, since the tip of the clamp piece is engaged and clamped in the through hole provided in the insert, the insert easily rotates around the through hole portion due to cutting resistance, and the engagement of the uneven portion is There was a risk that the insert could not be firmly fixed due to the release.

In addition, since the insert is provided with a through-hole, the insert itself has low rigidity, and the cutting resistance causes vibration, which makes it impossible to perform cutting with high dimensional accuracy. In addition, if excessive cutting force was applied, the insert could be damaged.

[0007] The present invention has been made in view of such a situation, and an insert detachable cutting tool capable of reliably preventing misalignment of the insert due to cutting resistance and performing cutting with high dimensional accuracy. And it aims at providing the insert used for this.

Means for solving the problem

[0008] The insert detachable cutting tool of the present invention is an insert detachable cutting tool configured by mounting an insert having a cutting edge on a mounting seat provided at the tip of a holder. The mounting seat includes a pedestal portion extending toward one side and a couch disposed to face the pedestal portion. And a lamp piece. The pedestal portion includes a pedestal surface on which the insert is placed, and an abutting wall portion that stands on the other end of the pedestal surface, and the clamp piece protrudes toward the pedestal portion. And two locking projections that protrude one step higher than the pressing projection toward the pedestal portion. The insert has a polygonal flat plate shape, protrudes in one direction when viewed from the side facing the polygonal surface, and has a nose portion provided with the cutting edge on a side ridge portion, and Locking portions that are provided on both sides of the base end portion and are respectively engaged with the locking projections, and are in contact with the contact wall portion facing away from the extending direction of the nose portion. A contact portion to be operated. The insert is arranged on the mounting seat such that the nose portion protrudes from the tip of the pedestal portion, and the clamp piece is brought close to the pedestal portion and retracted toward the other side. Thus, the insert is clamped and fixed.

[0009] Further, the insert of the present invention is an insert attached to the above-described insert detachable cutting tool, and the outer shape thereof is a polygonal flat plate shape, as viewed from the side facing the polygonal surface. A nose portion projecting in one direction and having the cutting edge provided on the side ridge portion, a locking portion provided on both sides of the base end portion of the nose portion, and an extending direction of the nose portion And a contact portion facing the opposite side.

[0010] According to the insert detachable cutting tool and the insert having this configuration, when the insert is mounted on the mounting seat, the insert is separated into the base surface, the pressing convex portion, the locking convex portion, and the abutting wall portion. It will be clamped. Therefore, since the insert is clamped from two directions and fixed, the displacement of the insert can be prevented even if the cutting resistance acts in any direction with respect to the nose portion.

Specifically, the locking part is formed on both sides of the base end part of the nose part, and the contact part is formed so as to face the side opposite to the extending direction of the nose part. It is possible to surely prevent the position from being shifted so that it rotates.

Furthermore, since the pedestal surface and the pressing projection are clamped, it is possible to reliably prevent the insert from being displaced so as to be lifted from the pedestal surface.

[0011] In addition, since it is not necessary to provide a through hole in the insert, the rigidity of the insert can be improved, and the occurrence of runout of the insert due to cutting resistance can be prevented and dimensional accuracy can be improved. Can be cut. Furthermore, it is possible to prevent the insert from being damaged by cutting resistance and extend the life of the insert.

Here, a coolant groove extending along an extending direction of the nose portion of the insert attached to the mounting seat is formed on a surface of the clamp piece facing the pedestal surface, and the holder A coolant supply hole communicating with the coolant groove may be formed.

In this case, the coolant supplied through the coolant supply hole is discharged along the extending direction of the nose portion through the coolant groove, so that the coolant can be reliably supplied toward the cutting point, and the cutting process is performed. Can be performed smoothly.

[0013] In addition, the insert of the present invention is a flat plate having an equilateral triangle shape, and each side of the equilateral triangle is directed toward the middle point side when viewed from the side facing the equilateral triangle surface. The three nose portions each having a pair of cutting blades extending so as to approach each corner of the equilateral triangular surface can be formed by forming the recesses inwardly according to the above. Good. An equilateral triangle is formed by connecting the intersections of the extension lines to the corners of the pair of cutting edges of the three nose portions with straight lines.

In this case, one nose portion is arranged so as to protrude from the pedestal portion, and the side surface on both sides of the base end portion of this nose portion, that is, the side surface between the other nose portions is used as a locking portion to engage the mounting seat. The insert is clamped to the mounting seat by engaging with the stop projection and contacting the contact wall with the side facing away from the extending direction of one nose as the contact. Can do. Therefore, by rotating this insert, the three nose parts can be used sequentially for cutting, and the life of the insert can be further extended.

[0014] The insert detachable cutting tool of the present invention is an insert detachable cutting tool configured by mounting an insert having a cutting edge on a mounting seat provided at the tip of a holder. The mounting seat has a pedestal portion extending toward one side, and a clamp piece disposed to face the pedestal portion. The pedestal portion includes a pedestal surface on which the insert is placed, and an abutting wall portion standing on the other end of the pedestal surface, and the clamp piece protrudes toward the pedestal portion. A protrusion and a second protrusion that protrudes further toward the pedestal than the pressing protrusion, and is arranged in a direction intersecting the direction in which the pedestal extends as viewed from the side facing the pedestal surface. And a convex portion. The insert is polygonal A nose portion that protrudes in one direction as viewed from the side facing the polygonal surface and has the cutting edge on the side ridge portion, and the one that the nose portion protrudes. A contact portion that faces away from the direction and contacts the contact wall portion, and two engagement recesses that are provided on the polygonal surface and engage with the engagement protrusion, respectively. And have! / The insert is disposed on the mounting seat so that the nose portion protrudes from the tip of the pedestal portion, the engaging convex portion is engaged with the engaging concave portion, and the pressing convex portion is moved forward. The insert is clamped and fixed by bringing it into contact with the polygonal surface, causing the clamp piece to approach the pedestal portion and retracting toward the other side.

[0015] Further, the insert of the present invention is an insert attached to the above-described insert detachable cutting tool, the outer shape of which is a polygonal flat plate shape, viewed from the side facing the polygonal surface. A nose portion protruding in one direction and provided with the cutting edge on a side ridge portion, an abutting portion facing away from the one direction in which the nose portion protrudes, and a polygonal surface With two engaging recesses!

[0016] According to the insert detachable cutting tool and the insert having this configuration, when the insert is mounted on the mounting seat, the insert is contacted with the pedestal surface, the pressing convex portion, and the engaging convex portion engaged with the engaging concave portion. Clamping is performed at the contact wall. Therefore, since the insert is clamped from two directions and fixed, the displacement of the insert can be prevented even if the cutting resistance acts in any direction with respect to the nose portion. Specifically, the two engaging convex portions of the clamp piece are arranged in a direction intersecting with the extending direction of the pedestal portion when viewed from the side facing the pedestal surface, and engage with the two engaging concave portions of the insert. In addition, since the abutting portion of the insert is pressed against the abutting wall portion of the pedestal portion by the retraction of the clamp piece, it is possible to reliably prevent the displacement of the insert so as to rotate on the pedestal surface. In addition, since the pedestal surface and the pressing projection are clamped, it is possible to reliably prevent the insert from being displaced so as to lift from the pedestal surface.

[0017] Further, since the engaging recess does not need to be provided so as to penetrate the insert, the rigidity of the insert can be improved, and the occurrence of the runout of the insert due to the cutting resistance can be prevented, and the cutting process can be performed with high dimensional accuracy. It can be performed. In addition, the insert can be prevented from being damaged by cutting resistance, and the life of the insert can be extended. Also, the two engaging recesses Since the portion can be formed closer to the abutting portion away from the nose portion, it is possible to avoid the clamp piece from protruding toward the tip end side of the nose portion, thereby impairing the chip discharging performance. The advantage that can be prevented is also obtained.

Here, a coolant groove is formed on a surface of the clamp piece facing the pedestal surface along a direction in which the nose portion of the insert attached to the mounting seat extends, and the holder includes A coolant supply hole communicating with the coolant groove may be formed. In this case, the coolant supplied through the coolant supply hole is discharged in the direction in which the nose extends through the coolant groove, so that the coolant can be reliably supplied toward the cutting location, and the cutting process can be performed smoothly. It becomes possible.

[0019] Further, the insert of the present invention has a flat plate shape whose outer shape is an equilateral triangle, and each side of the equilateral triangle is directed to the midpoint side when viewed from the side facing the equilateral triangle surface. The three nose portions each having a pair of cutting blades extending so as to approach each vertex toward the apex of the equilateral triangular surface can be formed by forming the recess so as to be recessed inwardly. Good. When the intersections of the extended lines toward the respective corners of the pair of cutting blades of the three nose parts are connected by straight lines, an equilateral triangle is formed, and the equilateral triangle surface is on a bisector of the nose part. Each one of the engaging recesses is formed. In this case, one nose part is arranged so as to protrude from the pedestal part force, and the two engaging recesses located on the bisector of the other nose part other than this one nose part are arranged in the two clamp pieces. Each of the inserts is attached to the mounting seat by engaging with the engaging convex portion and contacting the abutting wall portion with the side surface of the insert facing the direction opposite to the extending direction of the one nose portion as the abutting portion. Can be clamped. Therefore, by rotating the insert around the center of the equilateral triangular surface, the three noise portions can be used sequentially for cutting, and the life S of the insert can be further extended with a force S.

The invention's effect

[0020] According to the present invention, it is possible to provide an insert detachable cutting tool capable of reliably preventing displacement of the insert due to cutting resistance and performing cutting with high dimensional accuracy, and an insert used therefor. Can do.

Brief Description of Drawings FIG. 1 is a top view of an insert-detachable cutting tool 101 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG.

3 is a front view of the insert-detachable cutting tool 101 shown in FIG.

4 is a perspective view of an insert 140 used in the insert detachable cutting tool 101 shown in FIG.

FIG. 5 is a perspective view showing an insert 150 according to another embodiment of the present invention.

FIG. 6 is a perspective view showing an insert 160 according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of an insert detachable cutting tool 101 equipped with the insert 160 shown in FIG.

FIG. 8 is a perspective view showing an insert detachable cutting tool 201 according to a second embodiment of the present invention.

FIG. 9 is a plan view of the embodiment shown in FIG.

FIG. 10 is a side view of the embodiment shown in FIG.

FIG. 11 is a front view of the embodiment shown in FIG.

FIG. 12 is an enlarged sectional view taken along line BB in FIG.

FIG. 13 is a perspective view of the clamp piece 230 used in the embodiment shown in FIG. 8 as seen from the lower surface side.

FIG. 14 is a perspective view showing an insert 240 used in the embodiment shown in FIG.

FIG. 15 is a plan view of the embodiment shown in FIG.

FIG. 16 is a CC cross-sectional view in FIG.

FIG. 17 is a plan view showing an insert 250 according to another embodiment of the present invention.

FIG. 18 is a sectional view taken along the line DD in FIG.

FIG. 19 is a plan view showing an insert 260 according to another embodiment of the present invention.

FIG. 20 is a cross-sectional view taken along line EE in FIG.

FIG. 21 is a perspective view showing an insert 270 of still another embodiment of the present invention.

Explanation of symbols

[0022] 101 · · · Insert-detachable cutting tool, 110 · · Honoreda, 111 · · · Coolant supply hole, 115 … Mounting seat, 116 ··· Fixing screw, 120 ··· Base portion, 121 ··· Base surface, 122 ··· Abutment wall portion, 130… Clamp piece, 131 ··· Locking convex portion, 132 ··· Pressing convex portion Part, 133 ... Coolan groove, 140, 150, 160 ... insert, 141 ... seating surface, 142 ... scoop surface, 143 ... nose 咅 ^ 144 ... cutting blade, 1 46 ... locking 147 ... Abutting part 201 ... Insert removable type IJ tool 210 ... Holder 21 21 ... Coolant supply hole 215 ... Mounting seat 216 ... Fixing screw 220 ... Pedestal 221 ... Base surface 222 ... Abutting wall part 230 ... Clamp piece 231 ... Pressing convex part 232 ... Engaging convex part 233 ... Coolant groove, 240, 250, 260 ... Insert, 241 ... Seating surface, 242 ... Rake face, 243 ... Nose part, 244 ... Cutting edge, 245 ... Abutment part, 246, 251, 261 ... Engaging recess, L ... Axis, M ... Bisecting line

BEST MODE FOR CARRYING OUT THE INVENTION

[0023] (First embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 show an insert detachable cutting tool according to the present embodiment, and FIG. 4 shows an insert used for the insert detachable cutting tool.

This insert-detachable cutting tool 101 includes a holder 110 extending along the axis L, and an insert 140 attached to the tip of the holder 110 (FIG. 1 and FIG. 2) and the left side thereof.

[0024] As shown in Figs. 1 and 2, the holder 110 has a substantially quadrangular prism shape having an upper surface 110A and a lower surface 110B facing each other and a pair of side surfaces 110C, and an insert 140 is attached to the tip thereof. A mounting seat 115 is formed!

The mounting seat 115 includes a pedestal portion 120, a clamp piece 130 disposed opposite to the pedestal portion 120, and the clamp horse 130 fixed to the hororeda 110 and the clamp horse 130 close to the pedestal rod 120. And a fixing screw 116 that presses against.

[0025] As shown in FIGS. 1 to 3, the pedestal portion 120 is extended so as to protrude toward the tip side along the axis L, and the width of the pedestal portion 120 gradually increases according to the directional force toward the tip side. Is configured to be narrow.

As shown in FIG. 2, the front end side portion of the pedestal portion 120 is recessed one step downward from the upper surface 110A of the holder 110, and the upper surface of the recessed portion places an insert 140 described later. The pedestal surface 121. Further, a contact wall portion 122 that stands up from the pedestal surface 121 is provided on the base end side (right side in FIGS. 1 and 2) of the pedestal surface 121. In the present embodiment, as shown in FIG. 1, the pair of contact wall portions 122, 122 are formed symmetrically across the axis L when viewed from the side facing the upper surface 110A. 122 is inclined with respect to the side surface 110C of the holder 110 so as to gradually approach the axis L as it goes toward the tip side.

In addition, a housing hole 123 that opens upward is provided on the upper surface of the pedestal portion 120 that is continuous from the upper end to the base end side of the contact wall portion 122, and the housing hole 123 has a coil spring. 12 4 are housed. In addition, a screw hole 125 extending in a direction orthogonal to the upper surface of the pedestal 120 is formed in the bottom surface of the accommodation hole 123.

On the further proximal end side of the accommodation hole 123, a concave groove 126 is formed which is recessed downward and extends in the width direction of the holder 110 (vertical direction in FIG. 1). The side wall on the front end side of the concave groove 126 is an inclined wall 127 inclined to the upper surface 110A of the holder 110 such that the upward force is directed upward, and gradually the forward force is directed toward the distal end side. Further, a notch recess 128 is formed in the center portion in the width direction of the recess groove 126 by notching a part of the slope wall 127 so as to be orthogonal to the upper surface 110A.

In addition, a coolant supply hole 111 extending in parallel with the axis L is formed in the holder 110, and the coolant supply hole 111 is communicated with the distal end side of the base surface 121. A hole 112 is provided. Further, a connection portion 113 for connecting a coolant pipe (not shown) is provided at the base end side opening of the coolant supply hole 111.

The clamp piece 130 has a substantially rectangular shape as shown in FIG. 1, and a pair of locking projections 131, 131 projecting downward are provided at the tip corners thereof. The inner side surface of the locking projection 131 is configured to form a convex curve that is convex toward the inside of the clamp piece 130 in a cross section perpendicular to the protruding direction of the locking projection 131.

[0029] In addition, a pair of pressing protrusions 132, 132 protruding downward are arranged in parallel in the width direction on the base end side portion of the locking protrusion 131. The pressing protrusion 132 has a cylindrical shape as shown in FIGS. Further, the protruding height of the pressing convex portion 132 is set to be one step lower than the protruding height of the locking convex portion 131. The pair of pressing convex portions 132, 132 are The pair of locking projections 131 are arranged on the inner side in the width direction.

[0030] A coolant groove 133 extending toward the front end side is formed on the inner side in the width direction of the pair of pressing convex portions 132, 132.

On the base end side of the coolant groove 133, a through hole 134 force S that penetrates in the thickness direction of the clamp piece 130 is provided, and a seat dolly portion 135 is formed in an upper opening portion of the through hole 134. . Furthermore, an engaging portion 136 that protrudes downward is formed at the base end portion of the clamp piece 130, and the lower end surface of the engaging portion 136 is directed toward the base end side of the clamp piece 130. In accordance with the sea urchin, the gradual downward force is given as the inclined surface 137. In addition, a protrusion 138 extending further downward from the inclined surface 137 is formed at the central portion in the width direction of the engaging portion 136.

[0031] The fixing screw 116 has a multi-stage columnar shape, and has a screw portion 1 16A in which a male screw is formed on the outer peripheral surface and a rear end of the screw portion 116A. A shaft portion 116B having a one-step small diameter, and a head portion 116C that is continuously provided on the rear end side of the shaft portion 116B and protrudes outward in the radial direction are provided. The fixing screw 116 is passed through the through hole 134 of the clamp piece 130 so that the head portion 116C is accommodated in the seat drip portion 135, and the shaft portion 116B is passed through the coil spring 124. It is screwed into the screw hole 125 of the pedestal part 120. As a result, by loosening the fixing screw 116, the clamp piece 130 is moved away from the pedestal 120 by the coil spring 124, so that the insert 140 can be attached and detached without completely removing the fixing screw 116. Can be configured

[0032] Further, when the engaging portion 136 of the clamp horse 130 is engaged, the inclined surface 137 and the inclined wall 127 of the pedestal portion 120 are arranged so as to be slidable with the force S, and further project from the engaging portion 136. The protrusion 138 is accommodated in the cutout recess 128 of the base 120 with a gap in the vertical direction and the axis L direction. Further, the upper opening portion of the communication hole 112 of the pedestal portion 120 is disposed so as to face the proximal end portion of the coolant groove 133 of the clamp piece 130.

As described above, the mounting seat 115 including the pedestal portion 120, the clamp piece 130, and the fixing screw 116 is provided at the tip of the holder 110.

Next, the insert 140 attached to the mounting seat 115 will be described. This insert 140 is made of a hard material such as cemented carbide, and as shown in FIG. The shape is a regular triangular flat plate. One triangular surface is a seating surface 141, and the other triangular surface is a rake surface 142.

[0034] The insert 140 is formed such that each side of the equilateral triangle is recessed toward the inside according to the urging force toward the midpoint of each side when viewed from the side facing the rake face 142. Three nose portions 143 are formed. A rake face 142 cutting blades 144 and 144 are formed on the edge of each nose part 143. When the intersections of the extension lines to the corners of the pair of cutting edges 144 and 144 of the three nose parts 143 are connected by straight lines, an equilateral triangle is formed. It should be noted that the tip angle a of the nose portion 143 is set to α = 25 ° in the present embodiment in which it is preferable to set the tip angle a within the range of 15 ° ≦ a ≦ 35 °.

[0035] Between the two adjacent nose portions 143, when viewed from the side facing the rake face 142, the support surface portion 14 5 extending in a direction intersecting the extending direction of the two nose portions 143. Is formed. The support surface portion 145 serves as a locking portion 146 that is engaged with the locking projection 131 of the clamp piece 130. In the present embodiment, the support surface portion 145 is formed so as to be orthogonal to a direction that bisects the crossing angle in the extending direction of the two nose portions 143. As a result, the support surface portions 145 are arranged on both sides of the base end portion of the nose portion 143, respectively.

[0036] In the present embodiment, the side surface of the nose portion 143 is inclined so as to gradually retreat toward the inner side of the insert 140 from the rake face 142 toward the seating face 141. The cutting edge 144 has a clearance angle. However, the support surface portion 145 is formed so as to be orthogonal to the rake surface 142 and the seating surface 141, respectively.

[0037] The insert detachable cutting tool 101 is configured by mounting the insert 140 having such a configuration on the mounting seat 115 provided at the tip of the holder 110 as follows. .

First, the fixing screw 1 16 is loosened so that the clamp piece 130 and the pedestal 120 are separated from each other, thereby creating a gap in which the insert 140 can be inserted. Insert 140 is inserted into this gap from the front end side of holder 110 while arranging the extending direction of one nose portion 143A parallel to the axis L direction and slidingly contacting seating surface 141 with pedestal surface 121. The other two nose portions 143B, 14 located on both sides of the support surface portion 145 facing the opposite side of the extending direction of the one nose portion 143A The side surfaces of 3C are brought into contact with the contact wall portion 122 of the pedestal portion 120, respectively. That is, the side surfaces of the other two nose portions 143B and 143C are the contact portions 147.

[0038] Next, the fixing screw 116 is tightened. Then, the head 116C of the fixing screw 116 presses the seat drip portion 135 of the clamp piece 130 and moves so that the clamp piece 130 comes close to the pedestal portion 120, and the sliding of the inclined surface 137 and the inclined wall 127 As a result, the clamp piece 130 moves toward the base end. Then, the two locking protrusions 131 of the clamp piece 130 are brought into contact with the support surface portions 145 (locking portions 146) disposed on both sides of the base end portion of the one nose portion 143A of the insert 140 and clamped. The pressing protrusion 132 of the piece 130 is brought into contact with the rake face 142 of the insert 140.

Further, by tightening the fixing screw 116, the insert 140 is clamped in the vertical direction (the thickness direction of the insert 140) by the pedestal surface 121 and the pressing convex portion 132, and the locking convex portion 1 31 and the contact wall portion With 122, it is clamped in the direction of the axis L.

[0039] The insert detachable cutting tool 101 configured as described above is supported by a machine tool such as a lathe or a machining center, and the insert 140 is pressed against a workpiece rotating at a high speed. The workpiece 110 is cut so as to follow the workpiece by the cutting blade 144 of the one nose portion 143A that is relatively moved and protruded from the front end side of the holder 110.

[0040] According to the insert detachable cutting tool 101 according to the present embodiment, the insert 140 is clamped by the base surface 121 and the pressing convex portion 132, and the locking convex portion 131 and the abutting wall portion 122, respectively. The insert 140 can be firmly fixed, and the displacement of the insert 140 can be prevented even if the cutting force acts on the nose portion 143 in any direction.

[0041] Specifically, the support surface portions 145 located on both sides of the base end portion of one nose portion 143A are engaged with the locking projections 131 as locking portions 146, respectively, and the extension of one nose portion 143A is performed. Since the side surfaces of the other two nose parts 143B and 143C located on both sides of the support surface part 145 facing the opposite direction are in contact with the contact wall part 122 of the pedestal part 120 as the contact parts 147, The insert 140 is clamped at four points in the axis L direction, and the insert 140 can be reliably prevented from rotating or sliding on the pedestal surface 121.

The insert 140 has a base surface 121 in the vertical direction (the thickness direction of the insert 140). Since it is clamped by the pressing convex portion 132, it is possible to reliably prevent the insert 140 from being displaced from the pedestal surface 121 so as to lift up.

[0042] Furthermore, since it is not necessary to provide a through hole for mounting on the mounting seat 115 in the insert 140, the rigidity of the insert 140 can be improved, and the insert 140 can be prevented from shaking due to cutting resistance. Generation can be prevented and cutting can be performed with high dimensional accuracy. Further, the force S can be used to prevent the insert 140 from being damaged by the cutting force and extend the life of the insert 140.

Further, in the present embodiment, the coolant groove 133 is formed in the clamp piece 130 and the coolant supply hole 111 communicating with the coolant groove 133 is formed in the holder 110, so that the supply is made through the coolant supply hole 111. The coolant thus discharged can be discharged through the coolant groove 133 along the extending direction of one nose portion 143A. Therefore, the coolant can be reliably supplied toward the cutting location, and the cutting can be performed smoothly.

[0044] In addition, the outer shape of the insert 140 is a regular triangular flat plate shape, and three nose portions 143 extending toward each vertex of the regular triangular surface are formed when viewed from the side facing the regular triangular surface. Therefore, one nose part 143A is arranged so as to protrude from the pedestal part 120, and the support surface part 145 located between the other two nose parts 143B and 143C is used as the locking part 146. Attaching to the mounting seat 1 15 using the side surfaces of the other two nose parts 143B and 143C located on both sides of the support surface part 145 facing the opposite side of the extending direction of one nose part 143A as the contact part 147 be able to. Therefore, by rotating the insert 140, the three nose parts 143 can be sequentially used for cutting, and the life S of the insert 140 can be further extended with the force S.

[0045] While the insert detachable cutting tool according to the first embodiment of the present invention has been described above, the present invention is not limited to this, and is appropriately within a range not departing from the technical idea of the present invention. It can be changed.

For example, in the insert 140 of the first embodiment, the force S that causes the side surfaces of the nose portion 143 located on both sides of the support surface portion 145 to contact the contact wall portion 122, another embodiment shown in FIG. As in the case of the insert 150, a receiving surface 148 that contacts the contact wall 122 may be formed on both sides of the support surface 145. Here, the receiving surface 148 is changed to the rake surface 142 and the seating surface 141. If the contact wall portion 122 of the pedestal portion 120 is erected so as to be orthogonal to the pedestal surface 121, the contact wall portion 122 can be easily formed. Of course, the mounting rigidity of the insert 150 can be further improved.

[0046] Further, like the insert 160 of the other embodiment shown in FIG. 6, the side surface and the seating surface 141 and the rake surface 142 are orthogonal to each other, and the seating surface 141 and the rake surface 142 can be used interchangeably. It may be a negative type. In order to give relief to the side surface connected to the rake face 142, such an insert 160 was inclined so that the pedestal face 121 gradually receded toward the lower end as shown in FIG. The holder 110 is mounted by being clamped in a direction substantially perpendicular to the pedestal surface 121 (thickness direction of the insert 160) and a direction in which the pedestal surface 121 extends (projection direction of the nose portion 143).

[0047] In addition, although it has been described that the nose portion 143 is disposed so as to protrude along the axis L of the holder 110, the present invention is not limited to this, and in a direction oblique to the axis L of the holder 110. Alternatively, the nose portion 143 may be projected in a direction orthogonal to the axis L. Further, the shape of the holder 110, the shape of the clamp piece 130, and the shape of the insert 140 may be other shapes that are not limited to the present embodiment.

[0048] Further, the configuration in which the fixing screw 116 is screwed via the coil spring 124 has been described.

The 1S coil spring 124 may not be provided. However, by arranging the coil spring 124, a gap is generated between the clamp piece 130 and the pedestal portion 120 just by loosening the fixing screw 116, and this insertion gap can be easily attached and detached.

[0049] (Second Embodiment)

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. FIGS. 8 to 12 show an insert detachable cutting tool according to the present embodiment, FIG. 13 shows a clamp piece used for the insert detachable cutting tool, and FIGS. The insert of embodiment of this invention with which an insert detachable cutting tool is mounted | worn is shown. The insert detachable cutting tool 201 includes a holder 210 extending along the axis L, and the insert 240 of the above-described embodiment attached to the tip of the holder 210 (left side in FIGS. 8 and 9).

[0050] As shown in FIGS. 8 to 12, the holder 210 has an upper surface 210A and a lower surface 2 facing each other. 10B and a pair of side surfaces 210C are formed into a substantially quadrangular prism shape, and a mounting seat 215 for mounting the insert 240 is formed at the tip thereof. The mounting seat 215 is attached to a base portion 220, a step portion 210D that protrudes one step from the upper surface 210A, and is disposed to face the upper portion of the base portion 220. The clamp piece 230 is fixed to the holder 210. And a fixing screw 216 for pressing the clamp piece 230 so as to be close to the pedestal portion 220.

[0051] The pedestal part 220 is extended along the axis L so as to protrude toward one side of the front end side of the holder 210. The pedestal part 220 is configured such that its width gradually decreases as the urging force increases toward the front end side. Yes. As shown in FIG. 10, the tip side portion of the pedestal portion 220 is recessed one step downward from the upper surface of the step portion 210D, and the upper surface of the recessed portion is a pedestal surface 221 on which an insert 240 described later is placed. The pedestal surface 221 is inclined so as to have a directional force toward the tip, and gradually toward the lower surface 210B.

Furthermore, a contact wall portion 222 that stands in a direction perpendicular to the pedestal surface 221 is provided on the other base end side (right side in FIGS. 9 and 10) of the pedestal surface 221. In the present embodiment, as shown in FIG. 8, the pair of abutting wall portions 222 are formed symmetrically with respect to the axis L as viewed from the side facing the upper surface 210A. It is inclined with respect to the side surface 210C of the holder 210 so as to gradually approach the axis L symmetrically with the axis L as it goes toward the tip side. Further, a portion between the contact wall portions 222 (not shown) is formed in a planar shape extending perpendicularly to the axis L in a plan view perpendicular to the pedestal surface 221.

[0053] Furthermore, an accommodation hole 223 is formed on the upper surface of the step portion 210D so as to be positioned on the axis L in the plan view in a direction perpendicular to the pedestal surface 221. A coil spring 224 is accommodated in the accommodation hole 223. In addition, a screw hole 225 is formed coaxially with the accommodation hole 223 from the center of the bottom surface of the accommodation hole 223.

Furthermore, a recess 226 is formed on the back surface of the stepped portion 210D facing the base end side so as to be positioned on the base end side of the accommodation hole 223. As shown in FIG. 12, the recess 226 has an obtuse angle on the upper surface of the step portion 210D and gradually descends toward the proximal side as it goes downward, with respect to the center line of the receiving hole 223. A flat inclined wall 227 inclined at a fixed inclination angle, and flat in the receiving hole 223 so as to cut out a portion on the axis L of the inclined wall 227 in the plan view. A notch recess 228 extending in a row is formed.

In addition, the holder 210 is provided with a blind hole-shaped coolant supply hole 211 extending in parallel to the axis L from the base end thereof. The distal end side of the coolant supply hole 211 extends upward in parallel with the accommodation hole 223 and opens at the base end portion of the pedestal surface 221, and further along the portion between the pair of contact wall portions 222. The communication hole 212 communicates with the extended communication hole 212.

As shown in FIG. 9, the clamp piece 230 has a substantially rectangular shape extending along the axis L in the plan view, and two corners on the front end side of the lower surface thereof are shown in FIGS. As shown in FIG. 13, a pair of pressing projections 231 projecting downward is provided. Further, on the lower surface of these pressing convex portions 231, there are formed engaging convex portions 232 that protrude one step further downward, and these engaging convex portions 232 are as shown in FIG. 13 in this embodiment. It has a disc shape or a column shape.

Further, on the lower surface of the clamp piece 230, a coolant groove 233 that opens between the pair of pressing convex portions 231 and the engaging convex portions 232 and opens to the proximal end side of the clamp piece 230. Is formed. Further, the base end of the coolant groove 233 communicates with a through hole 234 that passes through the upper and lower surfaces of the clamp piece 230, and a seat drip portion 235 is formed at the upper surface opening of the through hole 234. In addition, the lower surface of the pressing convex portion 231 is in a direction perpendicular to the center line of the through hole 234, and the center line of the disk or cylinder formed by the engaging convex portion 232 is the center line of the through hole 234. It is made to be parallel to.

Furthermore, a protrusion 236 that protrudes downward and is accommodated in the recess 226 is formed on the lower surface of the clamp piece 230 on the base end side of the through hole 234. The surface of the projecting portion 236 facing the tip side is directed downward, and gradually becomes a force on the proximal end side of the clamp piece 230, and is inclined to the inclined surface 237. The inclination angle formed with respect to the recess 226 is equal to the inclination angle formed by the inclined wall 227 of the recess 226 with respect to the center line of the receiving hole 223. Further, at the lower end of the projecting portion 236, a cylindrical projecting portion 2 38 that projects further downward from the inclined surface 237 in parallel with the center line of the through hole 234 and is accommodated in the notched recess 228. Is formed.

[0059] Furthermore, the fixing screw 216 has a multi-stage columnar shape, and has a screw portion 216A in which a male screw is formed on the outer peripheral surface and a rear end of the screw portion 216A. one A shaft portion 216B having a stepped small diameter, and a head portion 216C that is connected to the rear end side of the shaft portion 216B and projects outwardly in the radial direction are provided. The fixing screw 216 is passed through the through hole 234 of the clamp piece 230 so that the head portion 216C is accommodated in the seat drip portion 235, and the shaft portion 216B is passed inside the coil spring 224 and screwed. When the portion 216A is screwed into the screw hole 225 of the pedestal portion 220, the clamp piece 230 is attached to the holder 210 so that the center line of the receiving hole 223 and the center line of the through hole 234 are coaxial. Mounted on step 210D.

[0060] In addition, the inclined surface 237 of the projecting portion 236 of the clamp piece 230 and the inclined wall 227 of the pedestal portion 220 are disposed so as to be in close contact with each other and slidable while being attached to the holder 210. The protruding portion 238 protruding from the protruding portion 236 is accommodated in the cutout recess 228 of the pedestal portion 220 with a gap in the vertical direction and the axis L direction. Further, the upper opening portion of the communication hole 212 of the pedestal portion 220 is disposed so as to face the proximal end portion of the coolant groove 233 of the clamp piece 230. Therefore, in this attached state, the pair of pressing convex portions 231 and the engaging convex portions 232 are the one extending so that the base portion 220 protrudes on both sides of the axis L of the holder 210 in the plan view. It is arranged in a direction that intersects (orthogonally) the axis L direction.

[0061] Next, the insert 240 attached to the mounting seat 215 will be described. This insert 240 is made of a hard material such as a cemented carbide, and as shown in FIG. 15, is a negative insert whose outer shape is formed in a regular triangular flat plate shape. One of the equilateral triangular surfaces is selected as the seating surface 241. The other equilateral triangular surface is the rake surface 242.

[0062] However, this insert 240 is seen from the side facing the seating surface 241 or the rake face 242 of the equilateral triangle, and the inner side of each side of the equilateral triangle toward the midpoint side (the center C side). The three nose portions 243 extending from the center C toward the vertices of the equilateral triangle are formed. A pair of cutting blades 244 and 244 are formed at the side ridges of the nose portions 243 so as to approach each vertex of the equilateral triangular surface. Extension lines to each corner of the pair of cutting edges 244, 244 of three nose parts 243 If each intersection of is connected with a straight line, it becomes an equilateral triangle. Further, the side surface of the insert 240 perpendicular to the equilateral triangular surface as the flank face of the cutting blade 244 is a contact portion 245 that contacts the contact wall portion 222 of the pedestal portion 220 and is adjacent to the circumferential direction. The crossing angle between the pair of contact portions 245 located on each side of the equilateral triangle between the nose portions 243 is equal to the crossing angle between the pair of contact wall portions 222.

[0063] Note that, by setting the crossing angle of the pair of contact portions 245 in this way, the tip angle α of the nose portion 243 is also set, and the tip angle α is 15 ° ≤ a ≤ 35 Force to be within the range of ° S Preferably, α = 25 ° is set in the present embodiment. The tip of the nose portion 243 is formed in a convex arc shape, while the pair of contact portions 245 intersect each other, and the portion where each side of the regular triangle is recessed toward the center C on the middle point side is the nose A concave arc surface having a larger radius than the convex arc at the tip of the part 243 is in smooth contact with the pair of abutting parts 245.

[0064] And, in the equilateral triangular surface of the insert which is the seating surface 241 or the rake surface 242, two engaging recesses 246 are formed for one nose portion 243 used for cutting. The engaging concave portion 246 is engageable with the two engaging convex portions 232 of the clamp piece 230.

The engaging recess 246 is a blind hole-like recess having a bottom surface, and in this embodiment, is recessed so as to form a disk-like or columnar space having a center line perpendicular to the equilateral triangular surface. The inner diameter and depth thereof are slightly larger than the outer diameter of the disk or cylinder formed by the engaging convex portion 232 and the amount of protrusion from the lower surface of the engaging convex portion 232, respectively.

[0065] Further, in the insert 240 of the present embodiment, such an engaging recess 246 has a bisector of each nose portion 243 as shown in FIG. 15 when viewed from the side facing the equilateral triangular plane. The center fountain is positioned at the same distance between the tip of the nose 243 and the center C. It is formed. The interval between two engagement recesses 246 that are circumferentially adjacent to each other in the equilateral triangular plane is equal to the interval between the two engagement projections 232 of the clamp piece 230, and thus the two engagement projections 232 are When engaged with the two engaging recesses 246, the one nose portion 243 in which the remaining engaging recesses 246 are positioned on the bisector M is used for copying. The insert detachable cutting tool 201 is configured by mounting the insert 240 having such a configuration on the mounting seat 215 provided at the tip of the holder 210 as follows. First, the fixing screw 216 is loosened so that the clamp piece 230 and the pedestal portion 220 are separated from each other, thereby creating a gap in which the insert 240 can be inserted. In this embodiment, a sheet 247 having the same shape and the same thickness as the equilateral triangular surface of the insert 240 is interposed between the seating surface 241 and the pedestal surface 221 of the insert 240. The above gap includes the thickness of the sheet 247. The insert 240 and the sheet 247 are inserted into the gap from the front end side of the holder 210 so that the bisector M of the one nose portion 243 coincides with the axis L in the plan view. A pair of contact portions 245 on one side of a regular triangle facing the opposite side to the one direction from which the nose portion 243 protrudes are brought into contact with the pair of contact wall portions 222 of the pedestal portion 220, respectively.

[0067] Next, when the fixing screw 216 is tightened, the head 216C of the fixing screw 216 presses the seat drip portion 235 of the clamp piece 230 and moves so that the clamp piece 230 approaches the pedestal portion 220. The clamp piece 230 moves toward the base end side by sliding between the inclined surface 237 and the inclined wall 227. Then, the two engaging convex portions 232 of the clamp piece 230 are fitted into the two engaging concave portions 246 other than the engaging concave portion 246 located on the bisector M of the one nose portion 243 of the insert 240 and engaged. When the insert 240 is brought into contact with the equilateral triangular surface of the insert 240, which is the rake face 242 and the fixing screw 216 is further tightened, the insert 240 and the pedestal surface 221 are pressed. The sheet 247 is clamped in the direction perpendicular to the pedestal surface 221 (thickness direction of the insert 240) with the part 231 and also clamped in the axis L direction with the engaging convex part 232 and the abutting wall part 222 . The sheet 247 may be clamped by one fixing means together with the insert 240, or may be clamped by a fixing means different from the insert 240.

[0068] The insert detachable cutting tool 201 configured as described above is supported by a machine tool such as a lathe or a machining center, and the insert 240 is pressed against the workpiece while the insert 240 is pressed against the workpiece rotating at high speed. The cutting edge 244 of the one nose portion 243 protruding from the tip end side of the holder 210 is cut so as to follow a workpiece such as a V pulley. At this time, the communication hole 212 is connected to the coolant supply hole 211. The coolant (cutting fluid) is supplied to the coolant groove 233 of the clamp piece 230 through the bisector M of the 1 nose portion 243 of the insert 240 at the tip of the nose portion 243. It is discharged and cools and lubricates the cutting part. When removing the insert 240, the clamping screw 230 is moved away from the base 220 by the coil spring 224 by loosening the fixing screw 216, so the fixing screw 216 is completely removed. The insert 240 can be attached and detached.

As described above, according to the insert detachable cutting tool 201 according to the present embodiment, the insert 240 is clamped by the pedestal surface 221 and the pressing convex portion 231, the engaging convex portion 232 and the abutting wall portion 222, respectively. Therefore, the insert 240 can be firmly fixed, and even if the cutting force acts on the nose portion 243 in any direction, the displacement of the insert 240 can be prevented.

[0070] Specifically, in the plan view, the insert 240 has two engaging protrusions 232 located on both sides of the axis L and arranged in a direction perpendicular to the axis L. Engage with two engaging recesses 246 located on both sides of the matched bisector M and arranged in a direction perpendicular to the axis L, and the axis L and the bisector M are also connected to each other. Clamped between each pair of abutting portions 245 and abutting wall portions 222 located on both sides of the sandwiched portion, that is, clamped at a total of four points in the direction of the axis L and the direction perpendicular thereto. Therefore, the insert 240 can be reliably prevented from rotating or sliding on the base surface 221. Further, since the insert 240 is clamped by the pedestal surface 221 and the engaging projection 232 of the clamp piece 230 in the direction perpendicular to the pedestal surface 221, the insert 240 is lifted from the pedestal surface 221. It is possible to reliably prevent displacement.

[0071] Furthermore, the engaging recess 246 provided in the insert 240 in this way can be formed in a blind hole shape without penetrating the insert 240, so that the rigidity of the insert 240 can be improved. In addition to preventing the occurrence of runout of the insert 240 due to cutting force, it is possible to perform cutting with high dimensional accuracy and prevent damage to the insert 240 even if an excessive load is applied, thereby extending the life of the insert 240. Can be achieved.

Further, in the present embodiment, the coolant groove 233 is formed in the clamp piece 230, and the coolant supply hole 211 communicating with the coolant groove 233 is formed in the holder 210. Therefore, the coolant is supplied through the coolant supply hole 211. Cut coolant through coolant groove 233 Can be supplied toward one nose 243 used. The two engaging protrusions 232 of the clamp piece 230 are arranged on both sides of the axis L with a space in the direction intersecting the axis L, and engage with the two engaging recesses 246 of the insert 240. Therefore, it is possible to arrange the coolant groove 233 along the axis L in a plan view so that a convex portion that prevents coolant supply is not formed on the axis L and the bisector M, and therefore, surely toward the cutting site. Coolant can be supplied to the pump and more reliable lubrication and cooling can be achieved.

[0073] Further, the outer shape of the insert 240 is a regular triangular flat plate shape, and three nose parts 243 extending toward each vertex of the regular triangular surface are formed when viewed from the side facing the regular triangular surface. Therefore, when any one nose portion 243 is arranged so as to protrude from the pedestal portion 220, the engagement recess 246 located on the bisector M of the other two nose portions 243 is The insert 240 can be mounted on the mounting seat 215 by engaging with the mating convex portion 232 and bringing the two abutting portions 245 opposite to the one nose portion 243 into contact with the abutting wall portion 222. wear. Therefore, this nose 240 can be rotated to use the three nose parts 243 in order for cutting, and the insert 240 can be turned upside down to use the opposite regular triangular surface as the rake face 242. With the force S, the life of the insert 240 can be further extended.

[0074] Further, since the engaging recess 246 is formed on the equilateral triangular surface thus defined as the rake face 242, the distal end portion of the clamp piece 230 having the engaging protrusion 232 that engages with the engaging recess 246. When viewed from the side facing the rake face 242, it can be stored in the triangular plane that does not protrude outward from the cutting edge 244 of the one nose portion 243 used for cutting. It is possible to prevent the situation where the amount of cutting of 244 is limited. In this embodiment, the engagement protrusion 232 is engaged with the two engagement recesses 246 separated from the one nose 243 toward the base end side of the holder 210, so that the clamp in the axial direction is performed. The position of the tip of the piece 230 can also be arranged closer to the base end side, and it is possible to prevent chips generated by cutting from colliding with the clamp piece 230 and damaging its discharge performance. it can.

[0075] The force described above for the insert detachable cutting tool 201 and the insert 240 according to the second embodiment of the present invention is not limited to this. Changes can be made as appropriate without departing from the technical idea.

For example, in the insert 240 of the second embodiment, the engagement recess 246 is formed to form a disk-like or columnar space similar to the engagement projection 232, as shown in FIGS. As with the insert 250 of another embodiment, the engaging recess 251 may be formed to have a concave spherical shape such as a hemispherical shape. Alternatively, like the insert 260 of another embodiment shown in FIGS. 19 and 20, a truncated cone or a conical space whose inner diameter gradually decreases with the engagement recess 261 facing the bottom may be formed. In these embodiments shown in FIGS. 17 to 20, the same reference numerals are assigned to portions other than the engaging recess 246 common to the insert 240 of the second embodiment shown in FIGS. 14 to 16. is there.

[0076] In this case, the engagement convex portion 232 of the clamp piece 230 may have a size and shape that can engage with the engagement concave portions 251 and 261 and draw the inserts 250 and 260 into the proximal end side of the holder 210. For example, it may protrude in the same disk shape or column shape as in the second embodiment. Further, in accordance with the shape of each engagement recess 251, 261, it protrudes in a convex curved shape such as a hemisphere, or protrudes in a truncated cone shape or a cone shape to engage with these engagement recesses 251, 261 In this case, however, the inserts 250 and 260 are slightly pressed by the engagement with the engagement recesses 251 and 261, so that the inserts 250 and 260 are pressed against the base surface 221 side. It is possible to further reliably prevent the position from being shifted from the base surface 221.

[0077] Furthermore, in these inserts 240, 250, 260, three engagement recesses 246, 251, 261 as described above are spaced apart from each other on the equilateral triangular surface that becomes the seating surface 241 or the rake surface 242. The force S formed independently with a gap, for example, the insert C 270 of the other embodiment shown in FIG. It may be formed so as to constitute one recess 271 having a triangular shape. In the present embodiment, three engaging recesses 246 are continuously formed corresponding to the insert 240 of the second embodiment shown in FIGS. 14 to 16, and a recess 271 is formed. Parts common to the insert 240 are also assigned the same reference numerals.

[0078] Even in such a case, the two engaging convex portions 232 of the clamp piece 230 are engaged with the two engaging concave portions 246 located at two of the three triangular portions formed by the concave portions 271. Insert 27 Since 0 is clamped, positional deviation can be prevented. However, even in this case, in order to ensure that the pressing convex portion 231 of the clamp piece 230 is brought into contact with the equilateral triangular surface which is the rake face 242, the perimeter of the equilateral triangular surface and the recess 271 are not connected to the concave portion 271. It is desirable that a flat surface portion that is continuous with the equilateral triangular surface is left with a certain width.

[0079] Furthermore, the inserts 240, 250, and 260 are all of the negative type, but the side surface of the cutting edge 244, which is the flank face, gradually moves from one equilateral triangle surface to the other equilateral triangle surface. It is possible to use a positive insert that is inclined so as to be retracted and the cutting edge 244 has a clearance angle. In this case, the engaging recess 24 6, 251, 261 only on one equilateral triangular surface that is the rake face 242 May be formed. However, also in this case, it is desirable that the side surface portion that becomes the contact portion 245 that contacts the pair of contact wall portions 222 of the pedestal portion 220 be perpendicular to these equilateral triangular surfaces.

[0080] In the insert detachable cutting tool of the second embodiment, the pedestal part 220 extends so as to protrude to one side along the axis L of the holder 210, and the insert 240 also corresponds to the nose of the first part. The force described as having the part 243 arranged so as to protrude is not limited to this, and the nose part 243 of the base parts 220 and 1 is obliquely crossed with the axis L of the holder 210 or the nose part. 243 may be projected in a direction perpendicular to the axis L. Furthermore, the shape of the hono-redder 210, the shape of the clamp piece 230, and the shape of the insert 240 may be other shapes that are not limited to this embodiment. For example, in the clamp piece 230 of the present embodiment, the engaging convex portion 232 protrudes from the lower surface of the pressing convex portion 231! /, And the force is formed separately at another position! /, May! / .

In addition, although described as a configuration in which the fixing screw 216 is screwed through the coil spring 224, the coil spring 224 may not be provided. However, when the coil spring 224 is placed, a gap is created between the clamp piece 230 and the pedestal portion 220 just by loosening the fixing screw 216, and this insertion gap can be easily attached and detached. .

Industrial applicability

The present invention relates to an insert detachable cutting tool configured by attaching an insert having a cutting blade to a mounting seat provided at the tip of a holder. The mounting seat is one side A pedestal portion extending toward the pedestal and a clamp piece disposed to face the pedestal portion. The pedestal portion includes a pedestal surface on which the insert is placed, and an abutting wall portion standing on the other end portion of the pedestal surface, and the clamp piece protrudes toward the pedestal portion. And two locking projections that protrude one step higher than the pressing projection toward the pedestal portion. The insert has a polygonal flat plate shape, and protrudes in one direction when viewed from the side facing the polygonal surface, and a nose portion provided with the cutting edge on a side ridge portion; and the nose portion A locking portion that is provided on both sides of the base end portion and engages with the locking projection, and abuts against the abutting wall portion facing away from the extending direction of the nose portion. A contact portion. The insert is disposed on the mounting seat such that the nose portion protrudes from the tip of the pedestal portion, and the clamp piece is brought close to the pedestal portion and retracted toward the other side. To clamp and insert the insert.

According to the present invention, it is possible to provide an insert detachable cutting tool that can surely prevent displacement of the insert due to cutting resistance and perform cutting with high dimensional accuracy, and an insert used therefor.

Claims

The scope of the claims

[1] An insert detachable cutting tool configured by attaching an insert having a cutting blade to a mounting seat provided at a tip of a holder,

The mounting seat includes a pedestal portion extending toward one side, and a clamp piece disposed to face the pedestal portion,

The pedestal portion includes a pedestal surface on which the insert is placed, and an abutment wall portion standing on the other end of the pedestal surface,

The clamp piece includes a pressing convex portion that protrudes toward the pedestal portion, and two locking convex portions that protrude further toward the pedestal portion than the pressing convex portion, and the insert is A nose portion having a polygonal flat plate shape, projecting in one direction when viewed from the side facing the polygonal surface and provided with the cutting edge on the side ridge portion, and a base of the nose portion Locking portions that are provided on both sides of the end portion and are respectively engaged with the locking projections, and are in contact with the contact wall portion so as to face away from the extending direction of the nose portion. A contact portion, and

The insert is arranged on the mounting seat so that the nose portion protrudes from the tip of the pedestal portion, and the clamp piece is brought close to the pedestal portion and retracted toward the other side. Accordingly, an insert detachable cutting tool for clamping and fixing the insert.

[2] The insert detachable cutting tool according to claim 1,

A coolant groove extending along an extending direction of the nose portion of the insert attached to the mounting seat is formed on a surface of the clamp piece facing the pedestal surface, and the coolant is formed on the holder. A coolant supply hole communicating with the groove is drilled!

[3] With an insert attached to the insert detachable cutting tool according to claim 1 or claim 2,

The outer shape is a polygonal flat plate shape that protrudes in one direction when viewed from the side facing the polygonal surface and has a cutting edge on the side ridge, and The locking portions provided on both sides of the base end portion are directed to the side opposite to the extending direction of the nose portion. An insert having a contact portion.

[4] The insert according to claim 3,

Its outer shape is a regular triangular flat plate shape, and when viewed from the side facing the equilateral triangle surface, each side of the equilateral triangle is dented toward the middle point, and indented toward the inside. Thus, three nose portions each having a pair of cutting blades extending toward each corner of the equilateral triangular surface are formed,

An insert that becomes an equilateral triangle by connecting the intersections of the extension lines to the corners of the pair of cutting blades of the three nose parts.

[5] An insert detachable cutting tool configured by attaching an insert having a cutting edge to a mounting seat provided at a tip of a holder,

The pedestal portion includes a pedestal surface on which the insert is placed, and an abutting wall portion standing on the other end of the pedestal surface,

The clamp piece protrudes toward the pedestal portion, and further protrudes toward the pedestal portion further than the pressing convex portion, and the pedestal portion is viewed from the side facing the pedestal surface. Two engaging projections arranged in a direction intersecting the extending direction,

The insert has a polygonal flat plate shape, as seen from the side facing the polygonal surface, protrudes in one direction and has a nose portion provided with the cutting edge on a side ridge portion, and the nose. A contact portion that faces the side opposite to the one direction in which the portion protrudes and contacts the contact wall portion, and is provided on the polygonal surface and is engaged with the engagement convex portion, respectively. Two engaging recesses,

The insert is disposed on the mounting seat such that the nose portion protrudes from the tip of the pedestal portion, the engaging convex portion is engaged with the engaging concave portion, and the pressing convex portion is An insert detachable cutting tool that clamps and fixes the insert by bringing it into contact with a polygonal surface, causing the clamp piece to approach the pedestal portion, and retracting toward the other side.

[6] The insert detachable cutting tool according to claim 5,

A coolant groove is formed on a surface of the clamp piece facing the pedestal surface along a direction in which the nose portion of the insert attached to the mounting seat extends. A coolant supply hole that communicates with it!

[7] An insert attached to the insert detachable cutting tool according to claim 5 or claim 6,

The outer shape is a polygonal flat plate shape, which protrudes in one direction when viewed from the side facing the polygonal surface, and has a nose portion provided with the cutting edge on the side ridge portion. An insert having a projecting contact portion facing away from the one direction and two engagement recesses provided on the polygonal surface.

[8] The insert according to claim 7,

Its outer shape is a regular triangular flat plate shape, and when viewed from the side facing the equilateral triangle surface, each side of the equilateral triangle is dented toward the middle point, and indented toward the inside. Thus, the three nose portions each having a pair of cutting blades extending toward each vertex of the equilateral triangular surface are formed,

When the intersections of the extension lines to the corners of the pair of cutting edges of the three nose parts are connected by a straight line, an equilateral triangle is formed.

The insert in which each said engagement recessed part is formed in the bisector of the said nose part in the said equilateral triangle surface.