JP2006247775A - Cutting tool and insert - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool and an insert for use in the cutting tool, adjusting the projection amount of a cutting edge outward in the radial direction of the tool body with good accuracy, reducing the size of a cutout part of the tool body, improving the rigidity of the tool body, improving dynamic balance, attaining high working accuracy, and used under high speed condition. <P>SOLUTION: This cutting tool 31 includes the long cylindrical tool body 32, wherein a plurality of cutout parts 39 are formed on the outer peripheral surface of the tool body 32, and a cartridge 51 having a cutting edge 65 is housed in the cutout parts. The cartridge 51 is flat in its outline, a cutting edge part 70 having the cutting edge 65 and a mounting part 53 are arranged side by side on the surface of the cartridge 51, and a slit 57 extending to separate the mounting part 53 from the cutting edge part 70 is formed on the back of the cartridge 51. The back of the cutting edge part 70 is provided with an adjusting mechanism 33 for adjusting the projection amount of the cutting edge 65 outward in the radial direction of the tool body 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a long cutting tool for processing a prepared hole formed so as to penetrate a workpiece to have a predetermined inner diameter.

  Conventionally, for example, a line bar disclosed in Patent Document 1 is known as this type of cutting tool. The line bar disclosed in Patent Document 1 has a long cylindrical tool body rotated about an axis, and a plurality of cutting blades are provided on the outer peripheral surface of the tool body in the axial direction. In the above-described line bar, it is necessary to accurately adjust the protruding amount of the cutting blade mounted on the outer peripheral surface of the tool body to the outside in the tool body radial direction. Therefore, a line bar is provided in which a finely adjustable micro cartridge capable of finely adjusting the protruding amount of the cutting blade as shown in Patent Document 2 is provided on the outer peripheral surface of the tool body.

  FIG. 23 and FIG. 24 show an example of a conventional line bar on which the above-described fine adjustment type micro cartridge is mounted. The line bar 1 has a long cylindrical tool body 2, and a plurality of notches 3 are provided in the direction of the axis O on the outer peripheral surface thereof. A fine adjustment type micro cartridge 4 is attached to the notch 3. The fine-tuning microcartridge 4 has a cylindrical bush 5 and is arranged so that the axis of the cylinder formed by the bush 5 is along the radial direction of the tool body 2.

  Inside the bush 5 is provided an inner wall 6 that divides the cylinder formed by the bush 5 into a tool body 2 radial inner side and a tool main body 2 radial outer side. , And a disc spring 8 is disposed between the washer 7 and the inner wall 6. An internal thread portion 9 is formed on the inner peripheral surface of the bush 5 on the outer side in the radial direction of the tool body 2, and an adjustment nut 10 is screwed thereon.

The adjustment nut 10 has a cylindrical outer shape, a male screw is formed on the outer peripheral surface of the cylinder, a female screw is formed on the inner peripheral surface of the cylinder, and an inner peripheral surface of the adjustment nut 10 is A cylindrical cutting blade portion 12 is screwed. That is, the cutting edge portion 12 is fitted into the bush 5 via the adjustment nut 10.
Moreover, the cutting blade part 12 and the washer 7 are connected by the clamp screw. And the insert 14 which has the cutting blade 13 is being fixed to the front end side of the cutting blade part 12, ie, the tool main body 2 radial direction outer side.

The line bar 1 is inserted into a pilot hole provided so as to penetrate the workpiece, and rotated around the axis O in a state in which both ends of the line bar 1 are supported by the machine tool. The plurality of cutting edges 13 provided on the outer peripheral surface 2 cuts a plurality of locations on the inner peripheral surface of the prepared hole.
Further, the fine adjustment type micro cartridge 4 mounted on the line bar 1 rotates the adjustment nut 10 with a work tool such as a spanner, so that the cutting blade portion 12 is not rotated, that is, the cutting blade 13 is rotated. The cutting edge portion 12 can be projected and retracted in the radial direction of the tool body 2 without changing the angle. Therefore, in this line bar 1, since the protrusion amount of the cutting blade 13 to the outside of the tool body 2 in the radial direction can be adjusted with high accuracy, the processing accuracy in the line bar 1 can be improved.
Japanese Patent Application Laid-Open No. 08-66810 Japanese Patent Laid-Open No. 06-210503

  By the way, in the fine adjustment type micro cartridge 4 attached to the line bar 1, it is necessary to accommodate the bush 5 to which the adjustment nut 10 is screwed in the tool body 2, and the notch 3 is provided on the outer peripheral surface of the tool body 2. There is a need. Further, since the adjustment nut 10 is rotated by a working tool such as a spanner, the amount of protrusion of the cutting blade 13 outward in the radial direction of the tool body 2 is adjusted, so that the spanner or the like is inserted into the notch 3 and the adjustment nut 10 is engaged. It is necessary to secure a space for rotating them together. Therefore, as shown in FIGS. 23 and 24, the notch 3 has a shape that expands outward in the radial direction of the tool body 2, and the tool body 2 needs to be greatly cut away.

  Further, since the fine adjustment type micro cartridge 4 itself contains the disc spring 8, washer 7, adjustment nut 10, etc., the size thereof is large, and the accommodating portion for accommodating the fine adjustment type micro cartridge 4 in the tool body 2. Will become bigger. Furthermore, since the insert 14 has a flat plate shape and the flat plate surface (triangular surface in FIG. 24) faces the tool rotation direction as a rake surface, the size of the notch 3 of the tool body 2 is further increased.

  Here, in the above-described line bar 1, when the outer diameter of the tool body 2 is smaller than the length in the direction of the axis O, and the notch portion 3 that is greatly cut out is formed on the outer peripheral surface of the tool body 2. Will significantly decrease the rigidity of the tool body 2. Therefore, there is a problem that the tool body 2 is bent due to the cutting resistance at the time of cutting, the position of the cutting edge 13 is not stable, and the processing accuracy of the line bar 1 is deteriorated.

  Further, in the cross section perpendicular to the axis O of the tool body 2, the center of gravity of the portion where the notch 3 is formed on the outer peripheral surface of the tool body 2 is shifted to the side opposite to the notch 3. There was a problem that the dynamic balance at the time of rotating around the axis O deteriorated and the tool main body 2 was vibrated to further deteriorate the machining accuracy. Further, when the rotational speed is increased, the vibration of the tool body 2 due to the deterioration of the dynamic balance becomes intense, so that the rotational speed of the line bar 1 cannot be increased and the machining efficiency is deteriorated. It was.

  This invention has been made in consideration of such circumstances, and can accurately adjust the amount of protrusion of the cutting blade outward in the radial direction of the tool body, and reduce the size of the notch portion of the tool body, An object of the present invention is to provide a cutting tool such as a line bar, which can increase the rigidity of the tool body and improve the dynamic balance, can be used under high-speed conditions with high machining accuracy, and an insert used for the cutting tool.

  In order to solve the above-described problems, the present invention has a long cylindrical tool body rotated about an axis, and a plurality of notches arranged in the axial direction are formed on the outer peripheral surface of the tool body. A cutting tool in which a cartridge having a cutting edge is accommodated in the notch and the cutting edge protrudes radially outward of the tool body, the cartridge having a flat outer shape and a thickness thereof. A cutting blade portion provided with the cutting blade on the surface of the cartridge facing the radially outer side is accommodated in the notch portion with the vertical direction directed in the radial direction of the tool main body, and the cartridge of the tool main body. A mounting portion to be mounted on the cutout portion is provided side by side, and a slit extending so as to separate the mounting portion and the cutting blade portion is formed on the back surface of the cartridge. The back side of the cutting edge Characterized in that the adjusting mechanism which presses the back surface of the cutting portion for adjusting the projection amount to the tool body radially outer side of the cutting edge is provided.

  In the cutting tool having the above-described configuration, a slit is provided between the mounting portion and the cutting blade portion, and an adjustment mechanism is provided on the back surface side of the cutting blade portion to adjust the protrusion amount of the cutting blade to the outside in the tool body radial direction. Therefore, when the back surface of the cutting blade portion is pressed by this adjusting mechanism, the cartridge is elastically deformed with the end point of the slit as a fulcrum, and the cutting blade protrudes outward in the tool body radial direction. On the other hand, by loosening the pressure on the back surface of the cutting edge, the cartridge is elastically restored and the cutting edge moves inward in the tool body radial direction. In this way, it is possible to adjust the protruding amount of the cutting blade to the outer side in the tool body radial direction, and it is possible to improve the processing accuracy of the cutting tool.

  Further, in the cutting tool having the above-described configuration, a plurality of cartridges arranged on the outer peripheral surface of the tool main body are formed in a flat plate shape, and a cutting blade portion and a mounting portion for the tool main body are arranged side by side. Since the cartridge is accommodated in the cutout portion in the radial direction of the tool body, the thickness of the cartridge can be reduced, and the depth of the cutout portion of the tool body can be reduced. In addition, the amount of protrusion of the cutting blade to the outside in the radial direction of the tool body can be adjusted from the back side of the cutting blade without inserting a work tool such as a spanner into the notch, that is, from the side opposite to the notch of the tool body. Therefore, it is possible to reduce the size of the notch portion of the tool main body and to prevent the rigidity of the tool main body from being lowered. Therefore, the tool body is prevented from being greatly bent by the cutting resistance, and the processing accuracy of the cutting tool can be further improved.

  In addition, since the notch formed in the tool body is small, the center of gravity of the tool body in a cross section perpendicular to the axis of the tool body is prevented from greatly deviating from the axis of the tool body, and the tool body is rotated around the axis. The dynamic balance at the time is improved. Therefore, the vibration of the tool body during high-speed rotation can be prevented, the rotation speed of the cutting tool can be increased, and the processing efficiency of this cutting tool can be improved.

  Further, by making the adjustment mechanism an adjustment screw that is screwed into the tool body toward the back surface of the cutting blade portion, the cutting blade can be protruded radially outward by screwing the adjustment screw, The cutting blade can be moved inward in the tool body radial direction by loosening the adjustment screw. Therefore, the protruding amount of the cutting blade to the outside in the radial direction of the tool body can be easily and precisely adjusted.

  The adjustment screw includes an adjustment shaft extending toward the back surface of the cutting blade portion and an adjustment nut having a head exposed on the outer peripheral surface of the tool body opposite to the notch portion. Thus, for example, even when the amount of protrusion of the cutting blade to the outside in the radial direction of the tool body is automatically adjusted by an automatic adjuster having a nut gripping portion that grips the head of the adjustment nut, The head of the exposed adjustment nut can be engaged with the portion, and the amount of protrusion of the cutting blade to the outside in the radial direction of the tool body can be adjusted by an automatic adjuster. Therefore, the protruding amount of the cutting blade to the outside in the radial direction of the tool body can be adjusted more easily and more precisely.

  Further, by providing the adjustment mechanism with a biasing member that biases the adjustment screw to the side opposite to the notch portion, the adjustment screw is always pressed to the side opposite to the notch portion by the biasing member. The generation of a gap (backlash) between the male screw and the female screw inside the tool body is prevented. Therefore, the protruding amount of the cutting blade to the outside in the radial direction of the tool body can be performed more precisely.

  The adjusting screw is housed in a housing hole that extends from the back surface of the cutting blade portion through the axis of the tool body in a direction perpendicular to the axis and has an opening on the outer peripheral surface of the tool body, By forming a flat portion in which the tool body is cut out around the opening, a flat portion is formed on the opposite side of the cartridge having the cutting blade portion with the axis of the tool body interposed therebetween. Therefore, the weight balance can be achieved in the cross section perpendicular to the axis of the tool body, and the dynamic balance of the tool body can be improved. Further, since the flat portion is provided, for example, in the case of having an adjustment nut as an adjustment screw, the head of the adjustment nut is surely exposed from the tool body, and the automatic adjustment with the nut gripping portion as described above is performed. The amount of protrusion of the cutting blade to the outside in the tool body radial direction by the machine can be reliably adjusted.

  Also, by screwing the adjustment screw in a direction inclined with respect to the tool body radial direction, the amount of movement of the cutting blade with respect to the screwing amount of the adjustment screw is reduced, so that the cutting blade is more accurately accurate than the pitch of the adjustment screw. The amount of protrusion can be adjusted. Therefore, the protruding amount of the cutting blade to the outer side in the radial direction of the tool body can be adjusted easily and more precisely.

  In addition, by configuring the cutting blade portion with an insert having the cutting blade and an insert mounting seat provided in the cartridge, the insert can be used when the cutting blade is worn or damaged by cutting. Since it can be used by exchanging, the life of the cutting tool is improved, and the usage cost of the cutting tool can be reduced.

  Further, as an insert attached to the insert mounting seat, a polygonal flat plate shape is formed, and the upper surface portion forming the polygon is attached to the insert mounting seat with the outer side in the radial direction of the tool body, and a side ridge of the upper surface portion. The portion is provided with a main cutting edge, and a chamfered portion is formed on the other side ridge portion of the polygon intersecting with the main cutting edge, and a secondary cutting edge connected to the main cutting edge is formed. By using the inserted insert, the insert can be mounted so that the thickness direction of the flat plate-like insert substantially coincides with the radial direction of the tool body, so that the thickness of the cartridge can be further reduced, and the tool in which the cartridge is accommodated The size of the notch portion of the main body can be reduced, and the rigidity of the tool main body can be further improved.

  As described above, according to the present invention, it is possible to accurately adjust the protruding amount of the cutting blade to the outside in the radial direction of the tool body, reduce the size of the notch portion of the tool body, improve the rigidity of the tool body, and move the tool body. It is possible to provide a long cutting tool such as a line bar that can improve the balance, have high processing accuracy, and can be used under high-speed conditions, and an insert used for this cutting tool.

A first embodiment of the present invention will be described with reference to the accompanying drawings. The line bar is shown in FIGS. FIGS. 7 and 8 show the cartridge, and FIGS. 9 to 11 show the insert attached to the cartridge.
The line bar 31 adjusts the position of the main cutting blade 65 in the radial direction of the tool main body 32, the cartridge 51 including the cutting blade portion 70 including the insert mounting seat 52 and the insert 61, and the main cutting blade 65. And an adjusting mechanism 33 to be used.

  The tool main body 32 is made of a steel material or the like, and is a long cylindrical body part 34 centering on the axis O, and a disk-like shape disposed at one end of the body part 34 and having a larger diameter than the body part 34. The attachment part 35 is provided. A plurality of coolant holes 36 (two in this embodiment as shown in FIG. 2) are provided in the tool body 32, extending in parallel with the axis O and having one end opened to the mounting portion 35.

  A plurality of notches 39 (10 in this embodiment as shown in FIG. 6) are formed on the outer peripheral surface of the tool body 32 in the direction of the axis O. The notch 39 is formed with a storage hole 40 extending along the radial direction of the tool main body 32 from the inner wall surface of the tool main body 32 in the radial direction. The large diameter portion 40A is opened on the rear end side of the storage hole 40 and opened on the outer peripheral surface of the tool. The first cutout portion 39A provided with the flat portion 41 and the second cutout portion having a through hole 42 that opens from the inner wall surface in the radial direction of the tool body 32 to the outer peripheral surface on the opposite side along the radial direction of the tool body 32. There are two types of 39B. The first cutout portions 39A and the second cutout portions 39B are alternately arranged in the direction of the axis O. Further, a coolant supply hole 43 communicating with the coolant hole 36 and opening toward the notch portions 39 is provided.

  An accommodation nut 40 provided in the first notch 39A accommodates an adjustment nut 44 having a columnar adjustment shaft 44A and a disk-shaped head portion 44B that is coaxial with the adjustment shaft 44A and has a large diameter. A coil spring 45 is disposed as a cylindrical urging member on the large diameter portion 40 </ b> A provided on the rear end side of the storage hole 40, and the adjustment shaft 44 </ b> A is inserted into the cylinder of the coil spring 45. A male screw portion 44C is formed between the adjustment shaft 44A and the head portion 44B of the adjustment nut 44, and this male screw portion 44C is screwed with a female screw portion 40B provided on the inner peripheral surface of the large diameter portion 40A. The disc-shaped head portion 44B is exposed to the flat portion 41 provided on the outer peripheral surface of the tool body 32. The coil spring 45 and the adjustment nut 44 constitute an adjustment mechanism 33.

An adjustment screw 47 is accommodated in the through hole 42 provided in the second notch 39B. An engagement hole is formed in the rear end surface of the adjustment screw 47, and this engagement hole is formed on the outer peripheral surface of the tool body 32. It is exposed towards.
The first cutout portion 39A and the second cutout portion 39B accommodate a cartridge 51 to which an insert 61 having a main cutting edge 65 is attached.

  The cartridge 51 accommodated in the notch 39 is formed in an oval plate shape as shown in FIGS. 7 and 8, and an insert mounting seat for attaching the insert 61 to the surface (left side in FIG. 8) of the cartridge 51. 52 and a mounting portion 53 for mounting the cartridge 51 on the tool body 32 are arranged side by side. The insert mounting seat 52 and the insert 61 constitute a cutting edge portion 70.

  A mounting screw insertion hole 54 through which the mounting screw 59 is inserted is provided in the mounting portion 53 so as to extend in the thickness direction of the cartridge 51. The insert mounting seat 52 has a recess 55 that is open to the front side in the tool rotation direction and the surface facing the radial outside of the tool body 32 when the cartridge 51 is mounted on the tool body 32. A mounting screw 56 is attached to the cartridge 51 in the thickness direction.

A slit 57 extending so as to separate the insert mounting seat 52 and the mounting portion 53 is formed on the back surface (right side in FIG. 8) of the cartridge 51, and the depth of the slit 57 is from the back surface of the cartridge 51 to the cartridge 51. The position is up to about half the thickness.
When the cartridge 51 is mounted on the tool main body 32, the portion on the rear side in the tool rotation direction extends parallel to the axis O, and the inclined surface 58 recedes inward in the radial direction of the tool main body 32 toward the rear side in the tool rotation direction. Is formed.
As shown in FIG. 8, the wall surface of the recess 55 provided in the insert mounting seat 52 on the radially inner side (right side in FIG. 8) of the tool body 32 is directed toward the cutting edge 70 side (upper side in FIG. 8) of the cartridge 51. The tool body 32 is formed so as to be gradually inclined radially outward (right side in FIG. 8).

  The insert 61 is made of a hard material such as a cemented carbide, has an outer shape formed in a square flat plate shape as shown in FIG. 9, and has a bottom surface portion 62 seated on the insert mounting seat 52 and a top surface portion 63 facing the bottom surface portion 62. And four side portions 64. In the present embodiment, the side surface portion 64 is a rake face, and the top surface portion 63 is a so-called vertical blade insert having a flank surface. Further, the side surface portion 64 is formed so as to gradually spread outward from the bottom surface portion 62 toward the upper surface portion 63, and has an isosceles trapezoidal shape as shown in FIG. The insert 61 is a positive insert with a clearance angle.

And the main cutting edge 65 is provided in the side ridge part which the side part 64 and the upper surface part 63 cross | intersect, and a chamfering part is formed in the other side ridge part of the polygon which the upper surface part 63 which cross | intersects this main cutting edge forms. When the insert 61 of FIG. 9 is viewed from the B direction, both ends of the upper surface portion 63 are formed in a convex curved shape as shown in FIG. The chamfered portion 66 is provided with a sub cutting edge so as to be continuous with the main cutting edge 65.
Further, an attachment screw insertion hole 68 extending perpendicularly to the bottom surface portion 62 is formed in the central portion of the square formed by the top surface portion 63.

The bottom surface portion 62 of the insert 61 is disposed so as to contact the recess 55 of the insert mounting seat 52 of the cartridge 51, and the mounting screw 56 is inserted into the mounting screw insertion hole 68 of the insert 61 and screwed to the insert mounting seat 52. The insert 61 is attached to the cartridge 51.
In addition, the mounting screw 59 is inserted into a mounting screw insertion hole 54 provided in the mounting portion 53, and the cartridge 51 is screwed into a screw hole formed in the notch 39 of the tool main body 32, so that the cartridge 51 is attached to the tool main body 32. It is attached to. Here, the cartridge 51 is accommodated in the first cutout portion 39 </ b> A and the second cutout portion 39 </ b> B, and the main cutting edge 65 portion of the insert 61 protrudes from the outer peripheral surface of the tool body 32.

The tip surface of the adjustment shaft 44A of the adjustment nut 44 accommodated in the accommodation hole 40 is brought into contact with the back surface side of the insert mounting seat 52 of the cartridge 51 accommodated in the first cutout 39A. 44B is exposed to the flat part 41 provided in the outer peripheral surface of the tool main body 32.
The tip of the adjustment screw 47 housed in the through hole 42 is in contact with the back surface side of the insert mounting seat 52 of the cartridge 51 housed in the second notch 39B, and the engagement hole of the adjustment screw 47 serves as the tool body. It is exposed to 32 outer peripheral surfaces.

The above-described line bar 31 is inserted into a pilot hole provided so as to penetrate the workpiece after adjusting the amount of protrusion of the main cutting edge 65 to the outside in the radial direction of the tool body 32, It is rotated around the axis O in a state where both ends are supported, and the plurality of main cutting edges 65 provided on the outer peripheral surface of the tool body 32 are used to cut a plurality of portions of the pilot hole.
Here, the cutting fluid is supplied to the coolant hole 36 opened in the mounting portion 35, and the cutting fluid is supplied toward the main cutting edge 65 of the cartridge 51 attached to the notch 39 through the coolant supply hole 43.

  In the line bar 31 configured as described above, the slit 57 is provided between the mounting portion 53 of the cartridge 51 and the insert mounting seat 52, and the position of the insert 61 in the radial direction of the tool body 32 is adjusted on the back side of the insert mounting seat 52. An adjustment mechanism 33 is provided. By pressing the back surface of the insert mounting seat 52 by the adjusting mechanism 33, the cartridge 51 is elastically deformed with the end point 57A of the slit 57 as a fulcrum, and the insert 61 protrudes outward in the radial direction of the tool body 32. On the other hand, by loosening the pressing force on the back surface of the insert mounting seat 52, the cartridge 51 is elastically restored, and the insert 61 moves inward in the radial direction of the tool body 32. In this way, the amount of protrusion of the main cutting edge 65 to the outside in the radial direction of the tool body 32 can be adjusted with high accuracy, and the processing accuracy of the line bar 31 can be improved.

The cartridge 51 has a flat plate shape, and a mounting portion 53 for the insert mounting seat 52 and the tool main body 32 is provided side by side. The cartridge 51 is accommodated in the notch 39 with its thickness direction directed in the radial direction of the tool main body 32. Therefore, the ratio of the cartridge 51 to the tool body 32 in the radial direction is small, and the size of the notch 39 that accommodates the cartridge 51 can be reduced. Further, the adjustment mechanism 33 provided on the back side of the insert mounting seat 52 can adjust the protrusion amount of the main cutting blade 65 outward in the radial direction of the tool body 32 with an operation from the side opposite to the notch portion 39 with high accuracy. It is not necessary to insert a work tool such as a wrench into 39, and the size of the notch 39 can be further reduced.
Accordingly, the rigidity of the tool body 32 can be increased, and the balance of the movement of the tool body 32 can be improved, so that the bending of the tool body 32 due to cutting resistance is prevented, the processing accuracy of the line bar 31 is improved, and the line The processing efficiency can be improved by increasing the rotation speed of the bar 31.

Further, since the flat portion 41 with the head 44B of the adjustment nut 44 exposed is formed on the opposite side of the first cutout portion 39A, the first cutout portion 39A and the flat portion 41 are in a cross section perpendicular to the axis O. It arrange | positions so that it may oppose on the axis line O, and a gravity center does not shift | deviate largely with an axis line. Therefore, the dynamic balance when the line bar 31 is rotated around the axis O can be further improved.
Further, since the head 44B of the adjustment nut 44 is exposed on the outer peripheral surface of the tool body 32, the amount of protrusion of the main cutting blade 65 to the outside of the tool body 32 in the radial direction can be adjusted using an automatic adjuster. That is, as shown in FIGS. 1 and 2, the head 44 </ b> B of the adjustment nut 44 can be gripped by the nut gripping portion H of the automatic adjuster, and the amount of protrusion of the main cutting blade 65 outward in the radial direction of the tool body 32 is adjusted. be able to.

  Further, since the coil spring 45 is provided as an urging member, the adjustment spring 44 is always pressed toward the outer peripheral side of the tool main body 32 by the coil spring 45, and the male screw portion 44C and the large diameter portion of the adjustment nut 44 are pressed. Generation of a so-called backlash between the 40A female thread portion 40B and the so-called backlash is prevented, and the position of the main cutting edge 65 of the insert 61 can be adjusted with higher accuracy. Here, a description has been given using a cylindrical coil spring as the urging member disposed in the large-diameter portion 40A provided on the rear end side of the storage hole 40, but the present invention is not limited to this. A disc spring or the like may be used.

Further, the insert 61 fixed to the cartridge 51 is a so-called vertical blade insert in which the side surface portion 64 is a rake face and the upper surface portion 63 is a flank surface. The small thickness direction can be attached to the tool body 32 in the radial direction, and the thickness of the cartridge 51 including the insert 61 can be reduced. Therefore, the size of the notch 39 that accommodates the cartridge 51 can be further reduced, and the rigidity of the tool body 32 can be further improved.
Moreover, since the insert 61 is formed symmetrically, the insert 61 can be effectively used by rotating the insert 61 and sequentially using the four main cutting blades 65, and the use cost of the insert 61 can be reduced.

Next, regarding the line bar according to the second embodiment of the present invention, portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.
In the present embodiment, similarly to the second notch portion 39B of the first embodiment, a through hole 82 is provided that opens from the inner wall surface of the notch portion 39 in the radial direction of the tool body 32 to the outer peripheral surface of the tool body 32. However, the through hole 82 is formed so as to be inclined with respect to the radial direction of the tool body 32, that is, to be inclined with respect to the adjustment direction of the main cutting edge 65. An adjustment screw 87 is screwed into the through-hole 82, and a pin whose tip end surface is obliquely cut is inserted into the tip end side of the adjustment screw 87. An engagement hole is formed on the rear end side of the adjustment screw 87, and this engagement hole is exposed toward the outer peripheral surface of the tool body 32.

The cartridge 51 is attached to the notch 39, and the tip end face of the pin that is obliquely cut off is brought into close contact with the back surface of the insert mounting seat 52 provided on the cartridge 51. The position of the main cutting edge 65 of the insert 61 is adjusted by inserting and rotating a hexagon wrench or the like into the engagement hole of the adjustment screw 87 exposed toward the outer peripheral surface of the tool body 32.
Here, since the adjustment screw 87 is provided so as to be inclined with respect to the adjustment direction of the main cutting edge 65, the position of the main cutting edge 65 can be adjusted with higher accuracy than the screw pitch of the adjustment screw 87. Therefore, the position adjustment of the main cutting edge 65 can be performed with high accuracy, and the processing accuracy of the line bar 31 can be further improved.

  In the present embodiment, the insert to be mounted has been described as an insert having a chamfered portion as a rake face and an upper surface portion as a flank surface, but the present invention is not limited thereto, and the side of the upper surface portion of the insert is not limited thereto. A so-called horizontal blade insert may be used in which a cutting edge is provided at the ridge and the upper surface portion is a rake face. However, when such an insert is used, it is necessary to mount the insert so as to stand on the outer peripheral surface of the tool body with respect to the tool body, which increases the thickness of the cartridge and the size of the notch. Therefore, it is preferable to use an insert as in this embodiment.

Although the insert has been described as a square flat positive insert, the present invention is not limited to this, and a negative insert as shown in FIGS. 15 to 18 may be used, and the chamfered portion extends in two polygonal surfaces. (Square surface) may be the same direction or alternate directions. In these cases, since eight sets of main cutting edges and sub cutting edges can be used, the cost of using the insert can be reduced.
Moreover, the thing of a triangular flat plate shape as shown in FIG. 19, FIG. 20 and the rhombus flat plate shape shown in FIG. 21, FIG.

It is a side view of the part which attached the cartridge to the 1st notch part of the line bar which is the 1st Embodiment of this invention. It is sectional drawing of the part which mounted | wore the cartridge to the 1st notch part of the line bar which is the 1st Embodiment of this invention. It is the side view which looked at the part which attached the cartridge to the 1st notch part of the line bar which is the 1st Embodiment of this invention from the cartridge side. It is a side view of the part which mounted the cartridge in the 2nd notch part of the line bar which is the 1st Embodiment of this invention. It is sectional drawing of the part which mounted | wore the cartridge to the 2nd notch part of the line bar which is the 1st Embodiment of this invention. It is a side view of the line bar which is the 1st embodiment of the present invention. It is a front view of the cartridge with which the line bar which is the 1st Embodiment of this invention is mounted | worn. It is a side view of the cartridge with which the line bar which is the 1st Embodiment of this invention is mounted | worn. It is a top view of the insert attached to the cartridge of FIG. It is the side view which looked at the insert of Drawing 9 from the A direction. It is the side view which looked at the insert of Drawing 9 from the B direction. It is a side view of the cartridge attachment part of the line bar which is the 2nd Embodiment of this invention. It is sectional drawing of the cartridge attaching part of the line bar which is the 2nd Embodiment of this invention. It is the side view which looked at the cartridge attachment part of the line bar which is the 2nd Embodiment of this invention from the cartridge side. It is a top view of an insert which is other embodiments of the present invention. It is a side view of the insert which is other embodiment of this invention. It is a top view of an insert which is other embodiments of the present invention. It is a side view of the insert which is other embodiment of this invention. It is a top view of an insert which is other embodiments of the present invention. It is a side view of the insert which is other embodiment of this invention. It is a top view of an insert which is other embodiments of the present invention. It is a side view of the insert which is other embodiment of this invention. It is a side view of the conventional line bar. It is a side view of the cartridge attachment part vicinity of the conventional line bar.

Explanation of symbols

31 Line bar (cutting tool)
32 Tool body 33 Adjustment mechanism 39 Notch 44 Adjustment nut 44A Adjustment shaft 44B Head 45 Coil spring (biasing member)
51 Cartridge 53 Mounting portion 57 Slit 47, 87 Adjustment screw 61 Insert 65 Main cutting edge (cutting edge)
66 Chamfer 70 Cutting edge

Claims (8)

A cartridge having a long cylindrical tool body rotated about an axis, a plurality of notches arranged in the axial direction is formed on the outer peripheral surface of the tool body, and a cartridge provided with a cutting blade in the notch A cutting tool that is housed and the cutting blade protrudes radially outward of the tool body,
The cartridge has a flat outer shape, is accommodated in the notch portion with the thickness direction directed in the radial direction of the tool main body, and the cutting blade is provided on the surface of the cartridge facing outward in the radial direction. A cutting blade portion and a mounting portion for mounting the cartridge on the notch portion of the tool body are juxtaposed, and the back surface of the cartridge extends to separate the mounting portion and the cutting blade portion. A slit is formed,
The tool body is provided with an adjustment mechanism on the back surface side of the cutting blade portion that presses the back surface of the cutting blade portion to adjust the protruding amount of the cutting blade to the outside in the radial direction of the tool body. A cutting tool characterized by that.   The cutting tool according to claim 1, wherein the adjustment mechanism is an adjustment screw that is screwed into the tool main body toward the back surface of the cutting blade portion.   The adjustment screw includes an adjustment shaft extending toward the back surface of the cutting blade portion and an adjustment nut having a head portion exposed on an outer peripheral surface opposite to the notch portion of the tool body. The cutting tool according to claim 2.   The cutting tool according to claim 2 or 3, wherein the adjustment mechanism includes a biasing member that biases the adjustment screw to a side opposite to the notch.   The adjustment screw is housed in a housing hole that extends from the back surface of the cutting blade portion through the axis of the tool body in a direction perpendicular to the axis and has an opening on the outer peripheral surface of the tool body, The cutting tool according to any one of claims 2 to 4, wherein a flat portion in which the tool body is cut out is formed around the portion.   The cutting tool according to any one of claims 2 to 4, wherein the adjusting screw is screwed in a direction inclined with respect to the tool body radial direction.   The cutting tool according to any one of claims 1 to 6, wherein the cutting blade portion includes an insert having the cutting blade and an insert mounting seat provided in the cartridge. An insert attached to the cutting tool according to claim 7,
A polygonal flat plate shape is formed, and the upper surface portion forming the polygon is attached to the insert mounting seat with the tool body main body facing radially outward, and a main cutting edge is provided on a side ridge portion of the upper surface portion, An insert, wherein a chamfered portion is formed on another side ridge portion of the polygon intersecting with the main cutting edge, and a secondary cutting edge connected to the main cutting edge is formed.

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