JP2012024875A - Insert and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert having high positioning accuracy and sufficient rigidity, and a cutting tool for performing crude processing and finish processing by one cutting process.SOLUTION: This insert 1 includes a bar-like shank section 2, handle sections 5 (5A and 5B) projecting at the ends of the shank section 2, a plurality of cutting edges 3 and 4 having cutting edges 3 (3A and 3B) for pressing work and cutting edges 4 (4A and 4B) for pulling work that are disposed at the ends of the handle sections 5 (5A and 5B), and a tilt surface 6B disposed on the handle section 5B on the opposite (second end B) side of the shank section 2 with respect to the cutting edges 3A and 4A on the first end A side. The cutting tool T inserts the insert 1 into an insertion hole 11 formed at the tip of a holder 10, and fixes it in a state where the tilt surface 6B is butted on a positioning member 12 disposed in the holder 10.

Description

  The present invention relates to a throw-away tip suitable for machining the inner diameter of a hole provided in a work material.

  As a cutting tool used for inner diameter cutting, as in Patent Document 1, cutting edges are formed at both ends in the longitudinal direction of a substantially rod-shaped insert, and the side surface of the center portion of the insert is the tip of a screw member screwed into a holder. What is locked and fixed with is known.

  Moreover, in patent document 2, the insert which formed a pair of cutting blade in the handle part which protrudes from the end of the substantially round-bar-shaped shank part is disclosed, and a pair of cutting blades may be the same shape, or as different shapes One of them can be used as a cutting blade for other purposes such as a threading process, a filleting process, or a pulling process in which a chip is retreated. Further, a flat surface is formed in the substantially round bar-shaped shank portion of the insert, and the flat surface is locked and fixed by the tip surface of the screw member screwed into the holder.

JP 2001-129704 A JP 2004-216465 A

  However, although such an insert is relatively accurately positioned in the axial direction, the core height of the insert is poor in repetition accuracy. That is, in positioning the core height, a flat surface (upper surface side plane portion) perpendicular to the core height direction is provided on the outer peripheral surface above the insert. For example, the upper surface side plane portion is pressed by screwing. Fix it. For this reason, the insert may rotate slightly when screwed and pressed, and skill is required to keep the core height constant when repeatedly fixing. As a result, the variation in repeated mounting accuracy increases. In addition, when performing roughing and finishing by inner diameter processing, after roughing, the insert is once pulled out from the hole of the work material, and a method of cutting by replacing with a cutting tool for finishing is employed. The machining process takes time, and the position of the cutting edge specified by the processing machine may be displaced in roughing and finishing, resulting in poor machining accuracy.

  An object of the present invention is to provide an insert with good positioning accuracy and a cutting tool in which the insert is mounted on a holder. Another object of the present invention is to provide a cutting tool capable of performing roughing and finishing with high accuracy in a single cutting process.

  The first insert of the present invention comprises: a rod-shaped shank portion; a handle portion protruding from the end portion of the shank portion; and a pressing cutting blade and a drawing cutting blade provided at a tip portion of the handle portion. A plurality of cutting blades, and an inclined surface provided on the opposite side of the shank portion with respect to the cutting blade.

  Further, the second insert of the present invention includes a rod-shaped shank portion, a handle portion protruding from the end portion of the shank portion, a pressing cutting blade and a drawing cutting blade provided at the tip portion of the handle portion. A plurality of cutting blades including blades and an inclined surface provided on the opposite side of the shank portion from the cutting blades.

  Here, in the above configuration, it is desirable that the amount of protrusion of the blade edge toward the side surface of the drawing cutting blade is smaller than that of the pushing cutting blade.

  In the above configuration, it is desirable that the handle portion and the plurality of cutting blades are disposed at both ends of the shank portion.

  Further, in the above-described configuration, the pressing blade is formed so as to protrude toward the tip side of the drawing blade, and the front flank of the pressing blade uses the other cutting blade. It is desirable to also serve as the inclined surface that becomes a restraining surface when performing.

  Moreover, in the said structure, it is desirable to latch the fixing member fixed to a holder with the outer peripheral curved surface of the said shank part.

  The cutting tool of the present invention includes a rod-shaped shank portion, a handle portion protruding from the end portion of the shank portion, a pressing cutting blade and a drawing cutting blade provided at the distal end portion of the handle portion. An insert having a plurality of cutting blades and an inclined surface provided on the opposite side of the shank portion from the cutting blade is inserted into an insertion hole formed at the tip of the holder, and provided in the holder It fixes in the state which contacted the said inclined surface to the positioning member.

  According to the insert of the present invention, since the inclined surface is provided on the side opposite to the cutting edge, the inclined surface can be attached to the holder by contacting the positioning member provided on the holder. It functions as a surface for constraining the length direction and the length direction, can suppress the rotation of the insert at the time of fixing, and has good repeatability in positioning the core height. Further, if the inclined surface also serves as the front clearance surface of the cutting blade for pressing, the shape of the insert can be a simple shape, and manufacturing is easy and dimensional accuracy is improved.

  Furthermore, since the cutting edge for pressing and the cutting edge for drawing are provided on the same tip side of the insert, roughing is performed by pressing while inserting the insert into the hole of the work material, and then the insert is cut. By performing the finishing process in the drawing mode when extracting from the material, roughing and finishing can be performed in one step. For this reason, the process can be shortened, and the cutting edge position shift due to the insertion error of the insert and the accuracy error of the machine at the time of shifting to the finishing process hardly occurs, and the cutting process with high accuracy is possible.

It is a schematic perspective view of the insert which is one Embodiment of this invention. FIG. 2A is a top projection view, FIG. 2B is a side projection view, and FIG. 2C is a front view projection view of the insert shown in FIG. 1. It is a schematic perspective projection view of the cutting tool which is one embodiment of the present invention using the insert shown in FIG. FIG. 4 is a (a) top view, (b) side view, and (c) tip view of the cutting tool shown in FIG. 3. It is a schematic perspective view which shows the modification of the insert of this invention. It is a side projection figure which shows the other modification of the insert of this invention.

Hereinafter, a cutting tool T for inner diameter processing that uses the insert 1 according to an embodiment of the present invention mounted on the holder 10 will be described with reference to FIGS. 1 is a schematic perspective view of the insert 1, FIG. 2 is a top projection view of the insert 1 of FIG. 1 as viewed from the X direction (upper surface direction), and FIG. 1B is a side projection view as viewed from the Y direction (side direction). (C) It is the front view projection figure seen from Z direction (tip direction). 3 is a schematic perspective projection view of the cutting tool T in which the insert 1 is mounted on the holder 10. FIG. 4 is a top projection view of the cutting tool T of FIG. 3 as viewed from the (a) X direction (upper surface direction). b) Side projection viewed from the Y direction (side direction), (c) Front end projected view viewed from the Z direction (tip direction).

  In FIGS. 1 and 2, the insert 1 is formed of a rod-like body, and a handle 5 is provided at each end of the shank 2 located at the center, and each of the first end A and the second end B of the handle 5 is provided. The cutting edge 3A and the cutting edge 4A for drawing, and the cutting edge 3B and the cutting edge 4B for drawing are formed at the tip of the cutting edge. This rod-shaped body refers to a shape whose basic shape is a substantially cylindrical shape, a substantially polygonal column shape, or a combination of these. In addition, in this embodiment, the shank part 2 is substantially circular in the cross section (cross section seen from the front end side) in the center part of a longitudinal direction.

  The insert 1 is a two-corner insert bar having cutting edges at both ends. In this embodiment, as shown in FIG. 2 (a), the cutting edges 3A, 4A on the first end A side and the cutting edges 3B, 4B on the second end B side are both cut of the insert 1. It is formed so as to protrude laterally with respect to the handle 5 (5A, 5B), which is a portion that can be inserted into the inner diameter of the material.

  Inclined surfaces 6 (6A, 6B) are formed on the tip surfaces of the first end A and the second end B, respectively. The inclined surface 6 is inclined so as to recede from the pressing blade 3A toward the drawing blade 4A (toward the shank portion 2). And according to this structure, the inclined surface 6 (6A, 6B) serves also as the flank of the cutting blade 3 for pressing (3A, 3B). The inclined surface 6 (6A, 6B) is used when the cutting blade 3B at the tip opposite to the inclined surface 6A is used, that is, when the cutting blade 3A is inserted into the insertion hole 11 of the holder 10. It functions as a restraining portion that is brought into contact with the positioning member 12 formed in the 10 insertion holes 11 and restrains the core height direction, the length direction, and the rotation direction of the insert 1. Similarly, the inclined surface 6B functions as a restraining portion that abuts the positioning member 12 and restrains the insert 1 when the cutting blade 3A is used. Also, the repeatability in positioning the core height is good. Furthermore, since a large cross-sectional area can be ensured with respect to a conventional shape in which a flat portion is provided on the upper surface side of the shank portion, it has sufficient rigidity.

  According to the shape of the insert 1 shown in FIGS. 1 and 2, it is difficult to finish at the deepest part of the hole of the work material, but the hole for the fluid bearing (FDB) of the spindle motor built in the hard disk (HDD). As in the above processing, it can be processed without problems in applications where the deepest part has relief.

  The shape of the inclined surface 6 is not particularly limited. The cross-sectional view perpendicular to the longitudinal direction of the insert 1 is desirably flat, but the side view parallel to the longitudinal direction may be, for example, a flat surface or a concave surface (particularly a concave curved surface). Moreover, in order for the part contact | abutted to the positioning member 12 of an inclined surface to be in the position away from the cutting blade 3 for a pushing process, and the cutting blade 4 for a drawing process, in order to suppress the defect | deletion of the cutting blades 3 and 4, And it is desirable to increase the positioning accuracy of the unused cutting edge when the inclined surface 6 including the used cutting edge is used as the restraint surface.

According to the configuration of FIGS. 1 and 2, the drawing cutting blade 4A is disposed at a position near the center of the rotationally symmetric position with respect to the central axis of the shank portion 2 from the position of the pressing blade 3A. The relationship between the pressing blade 3B for pushing and the cutting blade 4B for drawing is similar. With such a configuration, the handle 5 (5A, 5B) of the insert 1 is inserted into the hole of the work material while the work material is rotated, and the work is cut with the cutting blade 3 (3A, 3B) for pressing. After roughing by pressing while moving in the direction in which the handle 5 (5A, 5B) is inserted into the hole of the material, the drawing cutting edge 4 (4A) with the rotation direction of the work material unchanged 4B), the drawing process can be performed while proceeding in the direction in which the handle 5 (5A, 5B) is extracted from the hole of the work material. Further, since the cutting edge projection amount toward the side surface of the drawing cutting blade 4 (4A, 4B) is smaller than the pressing cutting blade 3 (3A, 3B), the handle portion 5 (5A, 5B) can be drawn with a small cut amount while increasing the cross-sectional area to increase the rigidity.

  In this embodiment, as shown in FIG. 2 (b), a chip pocket 8 extends in a region from the rake face of the cutting blades 3, 4 to the shank portion 2, and is generated by the cutting blades 3, 4. Even if chips are temporarily stored in the chip pocket 8 and a large amount of chips are gradually discharged from the gap between the inner wall surface of the work material and the insert 1, chips are generated near the cutting edges 3 and 4. Prevents clogging and cutting.

  On the other hand, as shown in FIGS. 3 and 4, the holder 10 is provided with an insertion hole 11 into which the insert 1 is inserted at the tip of the holder 10, and in the insertion hole 11, the inclined surface 6 of the insert 1 is provided. A positioning member 12 to be contacted is provided. 3 and 4, a plurality of positioning member mounting holes 13 for inserting the rod-shaped positioning member 12 are provided on the side surface of the holder 10. A rod-shaped positioning member 12 is inserted into one of the positioning member mounting holes 13. The reason why a large number of positioning member mounting holes 13 are provided is to make it possible to adjust the protruding amount of the insert 1 as appropriate.

  The positioning member 12 is not particularly limited as long as it is in contact with the inclined surface 6 of the insert 1 such as a pin or a screw material. Since a pin can be easily inserted and removed, the amount of protrusion of the insert can be easily changed. In this embodiment, a pin is used as the positioning member 12. The positioning member 12 is also provided so that the axis of the positioning member 12 is perpendicular to the longitudinal direction of the insertion hole 11.

  Further, the positioning member 12 is fixed by sandwiching and fixing both ends of the cylindrical pin with screws, and threading is applied to one end of the cylindrical pin, and this threaded portion is also provided in the holder 10. A method of screwing into a threaded portion, a method of fixing one end of a cylindrical pin with a taper shape having an enlarged diameter, and abutting and fixing the tapered portion to a predetermined position of the positioning member mounting hole 13, and a cylindrical pin with an adhesive A fixing method and a fixing method by tightening a screw member from a side surface of a cylindrical pin are mentioned.

  The position of the positioning member 12 in the insertion hole may be adjusted as appropriate according to the insertion angle of the inclined surface of the insert 1. It is desirable that the inclined surface 6 of the insert 1 and the positioning member 12 come into contact with each other so as to be in line contact. For example, when the positioning member 12 is a cylindrical pin, the insert 1 is mounted on the holder 10. In this case, it is desirable that the direction perpendicular to the longitudinal direction of the inclined surface 6 and the direction perpendicular to the longitudinal direction of the holder 10 on the outer peripheral surface of the positioning member 12 are parallel to each other. Thereby, stable and strong restraint is possible.

  According to FIGS. 3 and 4, in addition to the positioning member 12, an insertion hole is formed from the outer peripheral surface of the holder 10 on the tip side of the holder 10 in addition to the positioning member 12 in order to suppress the dropping and rattling of the insert 1. 11 is formed, and a screw member 15 that is a fixing member is screwed into the screw hole 14, and the outer peripheral surface of the shank portion 2 of the insert 1 is pressed and fixed at the tip of the screw member 15. . At this time, it is desirable that the outer peripheral surface of the shank portion 2 in contact with the screw member 15 is a curved surface. That is, when the shank portion 2 is brought into contact with the screw member 15 in a plane, the insert 1 may be rotated and attached due to manufacturing variation, and the attachment position may be out of order.

Then, the cutting tool T of the present invention in which the insert 1 is mounted on the holder 10 is provided in the insertion hole 11 by inserting the insert 1 into the insertion hole 11 of the holder 10 as shown in FIGS. The positioning member 12 is fixed with the inclined surface 6 in contact therewith. With such a configuration, good repeatability is obtained in positioning of the insert 1 in the longitudinal direction and the core height direction, and rotation of the insert 1 during cutting is also suppressed.

  1 to 4, the configuration in which the inclined surface 6 is formed on the tip surface of the insert 1 has been described. However, the present invention is not limited to this, and for example, as shown in FIG. An insert 1 ′ having a configuration in which an inclined surface 6 ′ (6′A, 6′B) is provided between the cutting blades A and B of “(5′A, 5′B)” and the shank portion 2 when extending from the cutting blades A and B. May be. Further, as shown in FIG. 6, a handle portion 5 ″ having a cutting blade 3 ″ for pushing and a cutting blade 4 ″ for drawing is formed only on one end side of the shank portion 2, and the other end is an inclined surface. It may be an insert 1 '' composed of only 6 ''.

1, 1 ′, 1 ″ insert 2 Shank 3 (3A, 3B), 3 ″ Cutting blade 4 (4A, 4B), 4 ″ Cutting blade 5 (5A, 5B), 5 '(5'A, 5'B), 5 "Handle 6 (6A, 6B), 6'(6'A,6'B),6" Inclined surface 7 (7A, 7B) Rake surface 8 ( 8A, 8B) Chip pocket 10 Holder 11 Insertion hole 12 Positioning member 13 Positioning member mounting hole 14 Screw hole 15 Screw member (fixing member)
T Cutting tool A 1st end B 2nd end

Claims (7)

  A plurality of cutting blades including a rod-shaped shank portion, a handle portion protruding from an end portion of the shank portion, a cutting blade for pushing and a cutting blade provided at a tip portion of the handle portion; An insert having an inclined surface provided on a side opposite to the shank portion with respect to the blade.   A plurality of cutting blades including a rod-shaped shank portion, a handle portion protruding from an end portion of the shank portion, a cutting blade for pushing and a cutting blade provided at a tip portion of the handle portion, and the shank; An insert having an inclined surface provided on the side opposite to the cutting edge.   The insert according to claim 1 or 2, wherein the amount of protrusion of the cutting edge toward the side surface of the drawing cutting blade is smaller than that of the pressing cutting blade.   The insert according to any one of claims 1 to 3, wherein the handle portion and the plurality of cutting blades are disposed at both ends of the shank portion.   The insert according to claim 4, wherein the cutting edge for pressing is formed so as to protrude toward the tip side of the cutting edge for drawing, and a front clearance surface of the cutting edge for pressing also serves as the inclined surface.   The insert according to any one of claims 1 to 5, wherein a fixing member that is fixed to a holder is latched by an outer peripheral curved surface of the shank portion. The insert according to any one of claims 1 to 6,
A cutting tool which is inserted into an insertion hole formed at the tip of the holder and fixed in a state where the inclined surface is in contact with a positioning member provided in the holder.