JP2014030856A - Cutter replacement type cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach and detach a plurality of cutting inserts to and from a tool body through one operation, and also to simplify a structure and to relax installation regulations.SOLUTION: A cutter replacement type cutting tool includes a tool body 1, a plurality of cutting inserts 10 mounted on a support seat 2 provided on the tool body 1, and clamp means 3 of fixing each cutting insert to the tool body 1. The clamp means 3 comprises a clamp bolt 6 screwed in the center of a tip of the tool body and a clamp member 8 having a plurality of clamp pieces 8a, and the clamp pieces 8a are pressed and inserted into wedge grooves by fastening the clamp member 8 with the one clamp bolt 6 so as to press and fix the plurality of cutting inserts 10 together at a time.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade-exchangeable cutting tool in which a cutting blade is configured using a detachable cutting insert, and more particularly, to a blade-exchangeable cutting tool that simplifies a plurality of cutting inserts.

  In a known rotary cutting tool equipped with a plurality of cutting inserts in the tool body, a wedge groove is provided between the cutting insert seated on the support seat of the tool body and the tool body, and a clamp piece is placed in the wedge groove. Some press-fit to fix the cutting insert.

  A rotary cutting tool of this type is mainly used in which the clamp piece is pushed in the tool radial direction and the clamp piece is pressed into and retracted from the wedge groove.

  In addition to the above-described structure using the clamp piece, the cutting insert in the cutting tool exchangeable cutting tool is fixed by clamping with a clamp screw or pulling with a pulling pin.

  Most of the cutting tool exchangeable cutting tools that employ these clamping methods employ a structure in which individual cutting inserts are individually fixed.

  In Patent Document 1 below, a first pressing member that presses the cutting insert against the support seat (attachment portion), a second pressing member that presses the first pressing member against the tool body (holder body), The structure which clamps a cutting insert combining the fastening member which fixes a 2 press member to a tool main body is described.

  In the structure, the clamping means includes a first pressing member that presses the cutting insert against the tool body, a second pressing member that presses the first pressing member against the tool body, and the second pressing member is tightened. The thing comprised with the fastening member is contained.

JP 2006-272478 A

  Cutting tools that individually fix individual cutting inserts require more labor and time for exchanging blades, making it difficult to achieve further efficiency in cutting.

  On the other hand, among the cutting tools disclosed in the above-mentioned Patent Document 1, a type that presses a plurality of first pressing members with a single second pressing member fixes, for example, two cutting inserts once. Can be fixed by the tightening operation, and the attachment / detachment of the cutting tool is simplified.

  However, the cutting tool disclosed in Patent Document 1 employs a pull-in type clamping means composed of three parts (a first pressing member, a second pressing member, and a tightening member), so that the structure is complicated. In addition to being disadvantageous in terms of cost, the size of the clamping means is increased, so that a small cutting tool is easily subject to installation regulations.

  Accordingly, an object of the present invention is to enable a plurality of cutting inserts to be attached to and detached from the tool body by a collective operation, and to simplify the structure and relax the installation regulations.

  In order to solve the above-described problems, in the present invention, a tool main body provided with a plurality of support seats at circumferential intervals on the outer periphery of the tip, a cutting insert attached to each of the support seats, and each cutting insert A cutting tool exchangeable cutting tool provided with clamping means for fixing the tool to the tool body was configured as follows.

  That is, the clamp means is composed of a clamp bolt or a W screw clamp screw that is screwed into the center of the tip of the tool body, and a clamp member that is fastened to the clamp bolt and clamp screw to fix the cutting insert to the tool body.

  Further, the clamp member is provided with a plurality of clamp pieces movable in the tool axis direction, and the plurality of clamp pieces are fastened with one clamp bolt or one clamp screw, whereby the tool body and the support are supported. Each cutting insert was pressed and fixed together by press-fitting into a wedge groove formed between the cutting inserts mounted on the seat.

  Such a cutting tool divides each clamp piece from each other, and includes a pressed portion that is arranged at the center of the tip of the tool body so as to overlap each divided piece in the tool axis direction, and in a hole provided in the pressed portion. It is preferable that the clamp bolt is inserted and the clamp member is tightened with the clamp bolt.

  Further, instead of the above structure that divides each clamp piece, a pressurized portion that is disposed at the center of the tip of the tool main body is formed on the clamp member, and a hole for inserting the clamp bolt into the pressurized portion or A screw hole for screwing the clamp screw is formed, the pressed part and each clamp piece are integrally formed, and further, individual bending of each clamp piece is allowed between the pressed part and each clamp piece. It is also preferable to form an elastically deformable portion.

  In the cutting tool exchangeable cutting tool according to the present invention, the plurality of clamp pieces included in the clamp member are fastened with a single clamp bolt, so that the plurality of cutting inserts can be attached and detached by a collective operation.

  Further, each clamp piece of the clamp member is pushed in the tool axis direction by a clamp bolt arranged at the center of the tip of the tool body and is press-fitted into a wedge groove formed between the tool body, so that the clamping means can be clamp bolts or It can be configured by a clamp screw and a clamp member, which is advantageous in terms of cost and eases application restrictions for small cutting tools.

Side view showing an example of the cutting tool exchangeable cutting tool of the present invention The side view which looked at the blade tool exchange-type cutting tool of FIG. 1 from the position rotated 90 degrees Front view of the cutting tool exchangeable cutting tool of FIG. The perspective view which shows the cutting tool exchange type cutting tool of FIG. 1 in the unclamped state (A): Perspective view of a clamp member provided in the cutting tool replaceable cutting tool of FIG. 1, (b): End view of the clamp member same as above, (c): Side view of the clamp member same as above. The perspective view which shows the other example of the cutting tool exchange-type cutting tool of this invention Front view of the cutting tool exchangeable cutting tool of FIG. The perspective view which shows the modification of a clamp means The perspective view which shows the further another example of the cutting tool exchange-type cutting tool of this invention (A): Perspective view of a clamp member provided in the cutting tool exchangeable cutting tool of FIG. 9, (b): Disassembled perspective view of the clamp member same as above. The perspective view which shows the further another example of the cutting tool exchange-type cutting tool of this invention (A): Perspective view of a clamp member provided in the cutting tool exchangeable cutting tool of FIG. 11, (b): End view of the clamp member same as above. (A): A perspective view showing an example of a cutting insert provided in the cutting tool exchangeable cutting tool of the present invention, (b): a plan view of the above cutting insert, (c): a side view of the above cutting insert, (d) : End view of the cutting insert

  Hereinafter, based on FIGS. 1 to 13 of the accompanying drawings, an embodiment of the blade-exchangeable cutting tool of the present invention will be described. 1-5 has shown the cutting tool exchange type cutting tool of the 1st form. FIGS. 6 to 8 show a cutting tool exchangeable cutting tool of the second form, FIGS. 9 and 10 show a cutting tool exchangeable cutting tool of the third form, and FIGS. 11 to 12 show a cutting tool exchangeable cutting tool of the fourth form. Each tool is shown.

  Each of the first to fourth embodiments includes a tool main body 1, a plurality of cutting inserts (blade tools) 10 to be mounted on the tool main body, and a clamp means 5 for fixing the cutting inserts to the tool main body 1.

  A plurality of support seats 2 and chip pockets 3 corresponding to the respective support seats are provided on the outer periphery of the tip of the tool body 1 at intervals in the circumferential direction, and a cutting insert 10 is mounted on each support seat 2. The mounting structure and the cutting insert used are the same in the first to fourth embodiments.

  As shown in FIG. 13, the cutting insert 10 is a positive type blade-tip replaceable insert that uses two corners at diagonal positions by a corner change by rotation of 180 degrees. It has the cutting edge 11 comprised by the ridgeline between.

  The illustrated cutting insert 10 is provided with a flat portion 14 pressed by the clamp means 5 and a vertically long concave portion 15 (a direction along the long side of the insert is assumed to be a vertical direction) near the center of the upper surface. The recess 15 is a preferable element but is not essential.

  The clamp means 5 includes a clamp bolt 6 (see FIGS. 4, 9, and 11) or a clamp screw 7 (see FIGS. 6 and 8) that is screwed into a screw hole (not shown) at the center of the tip of the tool body 1, and its The clamp member 8 is clamped to a clamp bolt or a clamp screw and presses and fixes the cutting insert 10 to the tool body 1.

  The clamp member 8 is a member that is fastened to the clamp bolt 6 or the clamp screw 7 and is propelled in the tool axis direction, and has the same number of clamp pieces 8a as the number of cutting inserts and bolt holes Bh through which the clamp bolts 6 are inserted (FIG. 5). , FIG. 10 and FIG. 12) or a pressurized portion 8b provided with a screw hole Sh (see FIG. 8) into which the clamp screw 7 is screwed.

  The clamp piece 8a is located at a position corresponding to each support seat 2, and the clamp piece 8a is press-fitted into a wedge groove 4 formed between the cutting insert 10 mounted on the support seat 2 and the tool body 1. The cutting insert 10 is pressed and fixed to the support seat. The wedge groove 4 has a groove width that narrows toward the rear of the tool body 1.

  The first embodiment shown in FIGS. 1 to 5 and the second embodiment shown in FIGS. 6 to 8 differ only in the method of tightening the clamp member 8. That is, the cutting tool exchange-type cutting tool of the first embodiment fastens the pressed portion 8b with the clamp bolt 6 inserted into the bolt hole Bh and propels the clamp piece 8a in the tool axis direction.

  On the other hand, in the second form cutting tool exchangeable cutting tool, one end side of a clamp screw 7 called a W screw having opposite threads cut at both ends is screwed into the screw hole Sh of the pressed portion 8, By operating the clamp screw 7 whose other end is screwed into the tool main body 1, the pressed portion 8b is tightened to push the clamp piece 7 in the tool axis direction.

  The clamp piece 8a of the clamp member has a pressing surface having a protrusion 9, and the flat surface 14 on the upper surface of the cutting insert is pressed by the pressing surface. The protrusion 9 on the pressing surface engages with a recess 15 provided on the upper surface 12 of the cutting insert, and functions to prevent the cutting insert 10 from shifting due to centrifugal force during cutting. The protrusions 9 are provided as necessary, and in a tool that omits the protrusions 9, the recess 15 of the cutting insert is also omitted.

  The cutting tool exchange type cutting tool of the third form and the cutting tool exchange type cutting tool of the fourth form use a countermeasure against the fear of non-uniform tightening of a plurality of cutting inserts due to machining errors.

  Inevitable machining errors occur in the support seat 2, the clamp member 8, and the cutting insert 10 of the tool body. Depending on the magnitude of the machining error, any one of the cutting inserts 10 may be clamped in advance, and the clamping of the other cutting inserts 10 may be insufficient due to subsequent tightening restrictions by the clamp.

  Therefore, the third embodiment of the blade-exchangeable cutting tool divides each clamp piece 8a from each other as shown in FIGS. Each divided piece is provided with a pressurized portion 8b that is arranged in the center of the tip of the tool body 1 so as to overlap in the tool axis direction, and one clamp bolt 6 is provided in a bolt hole Bh provided in the pressurized portion 8b. And the clamp bolt 6 is used to clamp the divided pieces of the clamp member together.

  In addition, as shown in FIGS. 11 and 12, the cutting tool replacement type cutting tool according to the fourth embodiment integrates each part of the clamp member 8 in the same manner as in the first embodiment and is arranged at the center of the tip of the tool body. An elastically deformable portion 8c that allows individual bending of each clamp piece is formed between the portion 8b and each clamp piece 8a.

  The illustrated elastically deformable portion 8c is formed by providing a slit cut in the tool radial direction behind the pressing surface of the clamp piece 8a, but is connected to the proximal end side of the clamp piece 8a (to the pressed portion 8b). It may be an elastically deformable part produced by narrowing the side).

  In addition, the structure of the 4th form can tighten the to-be-pressurized part 8b even if it uses any of the clamp bolt 6 and the clamp screw 7. FIG.

  Thus, if each divided piece is divided or individually bent, the machining error is absorbed by the individual movement and bending of each clamp piece, and after any one cutting insert 10 is clamped in advance. Also, tightening with the clamp bolt 6 and the clamp screw 7 can be continued. Therefore, other cutting inserts are also clamped stably.

  As can be seen from the above description, the cutting tool exchangeable cutting tool of the present invention can be configured by the clamp means of the clamp bolt or the clamp screw and the clamp member, and the cost can be reduced by reducing the number of parts. Further, since the clamping means has a simple and bulky structure, the present invention can be applied to a small cutting tool.

DESCRIPTION OF SYMBOLS 1 Tool body 2 Support seat 3 Chip pocket 4 Wedge groove 5 Clamp means 6 Clamp bolt 7 Clamp screw 8 Clamp member 8a Clamp piece 8b Pressurized part 8c Elastically deformable part 9 Protrusion Bh Bolt hole Sh Screw hole 10 Cutting insert 11 Cutting Blade 12 Upper surface 13 Side surface 14 Flat portion 15 Recess

Claims (3)

A tool body (1) provided with a plurality of support seats (2) at circumferential intervals on the outer periphery of the tip, a cutting insert (10) attached to each of the support seats (2), and each cutting insert A cutting tool exchangeable cutting tool comprising a clamping means (5) for fixing to a tool body (1),
The clamp means (5) is clamped to a clamp bolt (6) or a W screw clamp screw (7) screwed into the center of the tip of the tool body (1), and the cutting insert (10) is fastened to the clamp bolt or clamp screw. It consists of a clamp member (8) fixed to the tool body,
The clamp member (8) has a plurality of clamp pieces (8a) movable in the tool axis direction,
The plurality of clamp pieces (8a) are tightened with a single clamp bolt (6) or a single clamp screw (7), and the cutting inserts mounted on the tool body (1) and the support seat (2) ( 10) A cutting tool exchangeable cutting tool configured to press into each of the cutting inserts (10) by press-fitting into a wedge groove (4) formed between them.   Each of the clamp pieces (8a) is divided from each other, and each of the divided pieces has a pressed part (8b) arranged in the center of the tip of the tool body (1) so as to overlap in the tool axis direction. The cutting tool exchangeable cutting tool according to claim 1, wherein the clamp bolt (6) is inserted into a bolt hole (Bh) provided in a portion, and the clamp member (8) is tightened by the clamp bolt.   The clamp member (8) has a pressurized part (8b) disposed at the center of the tip of the tool body (1), and a bolt hole through which the clamp bolt (6) is inserted into the pressurized part (8b). (Bh) or a screw hole (Sh) into which the clamp screw (7) is screwed, the pressed portion (8b) and each clamp piece (8a) are formed integrally, and the pressed portion ( The cutting tool exchangeable cutting tool according to claim 1, wherein an elastically deformable portion (8c) that allows individual bending of each clamp piece is formed between 8b) and each clamp piece (8a).

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