JP2014223698A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool having a configuration capable of down-sizing without lowering the rigidity of a tool body so much.SOLUTION: A cutting tool 1 comprises: a first cutting insert 10 showing a flat plate shape and having a cutting edge 11; a second cutting insert 20 showing a flat plate shape and having a cutting edge 21; a tool body 30 having longitudinal tips, to which the first and second cutting inserts 10 and 20 are mounted; and a spacer 40 having a predetermined thickness. In the cutting tool 1, the first and second cutting inserts 10 and 20 are fixed to the tool body 30 while holding the spacer 40 therebetween.

Description

  The present invention relates to a cutting tool, and more particularly to a cutting tool having a plurality of cutting inserts.

  As a cutting tool provided with a plurality of cutting inserts, for example, a cutting tool described in Patent Document 1 is known. In the cutting tool described in Patent Document 1, cutting inserts are attached to both sides of the tip of the tool body with screws.

JP 2003-245809 A

  However, in the cutting tool described in Patent Document 1, it is necessary to provide a number of mounting holes corresponding to the cutting insert in the tool body. For this reason, there existed a problem that the rigidity of a tool main body fell or a cutting insert enlarged. On the other hand, in the configuration of the cutting tool described in Patent Document 1, when trying to reduce the size of the cutting insert, it is necessary to widen the interval between the cutting inserts as shown in FIG. There was a problem of increasing the size.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cutting tool having a configuration that can be downsized without significantly reducing the rigidity of the tool body.

  In order to solve the above problems, a cutting tool according to the present invention includes a first cutting insert having a flat plate shape and having a cutting edge, a second cutting insert having a flat plate shape and having a cutting edge, A tool body on which the second cutting insert is attached to the front end in the longitudinal direction and a spacer having a predetermined thickness are provided, and the first and second cutting inserts are fixed to the tool body with the spacer interposed therebetween. It is characterized by that.

  In this cutting tool, the first and second cutting inserts are fixed to the tool body with a spacer interposed therebetween. In this case, the distance between the cutting inserts can be secured by the spacer, and the cutting inserts spaced apart by the spacer can be collectively fixed to the tool body. Therefore, according to the cutting tool according to the present invention, it is possible to reduce the size of the cutting tool without significantly reducing the rigidity of the tool body.

  The cutting tool preferably further includes a fixing member that fixes the first and second cutting inserts and the spacer to the tool body. In this case, the first and second cutting inserts and the spacer can be reliably fixed to the tool body by the fixing member. In this cutting tool, the first and second cutting inserts and the spacer are each provided with a through hole, and the fixing member is attached to the tool body through each through hole. The through hole of the second cutting insert is preferably tapered or stepped from one side to the other.

  In the above cutting tool, the tool main body has a housing portion for housing the first and second cutting inserts at the tip thereof, and the housing portion is at least a flat end surface of the first and second cutting inserts. It is preferable that the first and second cutting inserts are fixed to the tool body so as to be biased by the constraining surface. In this case, the restraint surface can prevent the displacement (rotational displacement) of the cutting insert due to the load during the cutting process, and can secure the cutting insert and the tool body more reliably.

  In the cutting tool, the first and second cutting inserts may have the same shape. In this case, it is not necessary to prepare separate cutting inserts, and the configuration of the cutting tool can be simplified. Depending on the required cutting process, the first and second cutting inserts may have different shapes. In this case, more complicated cutting can be performed.

  In the above cutting tool, it is preferable that the first and second cutting inserts are fixed to the tool body so that the respective central axes are coaxial. In this case, the alignment between the cutting inserts becomes easy, and in particular, when the first and second cutting inserts have the same shape, the alignment becomes even easier.

  Moreover, this invention can also be caught as invention of the manufacturing method using one of the cutting tools mentioned above as another side surface. That is, the product manufacturing method according to the present invention includes a step of attaching any of the cutting tools described above to a cutting device, a step of rotating a workpiece, and cutting of the cutting tool with respect to the rotating workpiece. And a predetermined cutting process using a blade. According to this manufacturing method, cutting can be performed without significantly reducing the rigidity of the tool body. Therefore, efficient processing can be performed over a long period of time, and the production cost of the product can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting tool provided with the structure which can be reduced in size, without reducing the rigidity of a tool main body so much can be provided. Further, in the present invention, since the insert seat processing can be performed in the same process, a step in the longitudinal direction between the chips as in the conventional case is hardly generated, and a cutting tool having a higher quality cutting insert is provided. Can do.

It is a perspective view which shows the cutting tool which concerns on one Example of this invention. It is the elements on larger scale which expanded the front-end | tip part of the cutting tool shown in FIG. FIG. 3 is a partial enlarged perspective view in which a second cutting insert is removed from a tip portion of the cutting tool shown in FIG. 2. It is a fragmentary sectional view in alignment with the IV-IV line of the front-end | tip part of the cutting tool shown in FIG. 1, (a) is a figure containing a fixing member, (b) is a figure except a fixing member.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  FIG. 1 is a perspective view showing a cutting tool according to the present embodiment. As shown in FIG. 1, the cutting tool 1 includes a first cutting insert 10, a second cutting insert 20, a tool body 30, a spacer 40, and a fixing member 50. The cutting tool 1 is attached to a cutting device (not shown), and a predetermined cutting process is performed on a workpiece to be held and rotated by a holding device (not shown) using the cutting edges 11 and 21 (see FIG. 2). It is a tool for applying (for example, groove processing).

  As shown in FIGS. 1 and 2, the first cutting insert 10 has a substantially equilateral triangular plate shape and is configured to have a cutting edge 11, a rake face 12, and a breaker 13 at each corner. The Further, as shown in FIGS. 3 and 4, the first cutting insert 10 is formed with a through hole 14 that penetrates the center of the flat plate shape. The through hole 14 has a tapered or stepped cross section, and the opening on the spacer 40 side is larger than the opening on the attachment side of the tool body 30. A fixing member 50 is inserted into the through hole 14 as will be described later.

  The second cutting insert 20 has the same shape as the first cutting insert 10, has a substantially equilateral triangular flat plate shape, and has a cutting edge 21, a rake face 22, and a breaker 23 at each corner. Composed. As shown in FIG. 4, the second cutting insert 20 is formed with a through hole 24 that penetrates the center of the flat plate shape. The through hole 24 has a tapered or stepped cross section like the through hole 14, and the outer opening is larger than the opening on the spacer 40 side. With such a configuration, the head of the fixing member 50 inserted into the through hole 24 is caught by the tapered portion or the stepped portion, and the second cutting insert 20 is attached to the tool main body 30 together with the first cutting insert 10 and the spacer 40. Fix it. The first and second cutting inserts 10 and 20 may not have the same shape but may have different shapes. Moreover, the 1st and 2nd cutting insert 10 and 20 may be polygonal flat plate shapes, such as a substantially triangular shape and a substantially square shape, instead of the substantially equilateral triangular flat plate shape.

  The spacer 40 has a cylindrical shape having a predetermined thickness, and a through hole 42 is formed therein. The predetermined thickness of the spacer 40 is, for example, about 0.5 mm to 3 mm. The spacer 40 is disposed so as to be sandwiched between the first and second cutting inserts 10 and 20, and the first and second cutting inserts 10 and 20 are spaced apart from each other by a predetermined distance so as not to interfere with each other. The spacer 40 is preferably made of a material having a strength that does not change the separation distance between the first and second cutting inserts 10 and 20 over a long period of time. For example, the spacer 40 is made of an alloy steel such as SCM440.

  The tool main body 30 has a distal end portion 31 to which the first and second cutting inserts 10 and 20 are attached, and a substantially rectangular parallelepiped base portion 32 to which the tool main body 30 is fixed to a cutting device. The tool main body 30 is formed with a receiving portion 34 for receiving the first and second cutting inserts 10 and 20 and the spacer 40 together at the distal end portion in the longitudinal direction.

  The accommodating part 34 is a space having a substantially equilateral triangular cross section so as to correspond to the shape of the cutting inserts 10 and 20, and an upper part in the drawing (a part corresponding to one side of the substantially equilateral triangular shape) is an opening. Yes. Constraining surfaces 35 and 36 are formed on the portion of the accommodating portion 34 that is not opened (the other two sides of the substantially equilateral triangle shape). The restraining surfaces 35 and 36 are partly in contact with the flat plate-like end surfaces of the first and second cutting inserts 10 and 20 to restrain them.

  The tool body 30 is formed with an escape portion 37 (also referred to as a dullness) in the lower portion of the housing portion 34 in the figure, and the cutting edges 11, 21 that are not used by the first and second cutting inserts 10, 20 are provided. It can be placed and accommodated at the location. The presence of such a relief portion 37 allows the first and second cutting inserts 10 and 20 to be replaced with other cutting edges 11 and 21 when one of the cutting edges 11 and 21 is damaged. The second inserts 10 and 20 can be easily rotated and rearranged.

  A screw hole 38 for attaching a fixing member 50 composed of a screw or the like is formed on the side surface 33 that defines the housing portion 34 of the tool body 30 together with the restraining surfaces 35 and 36. Then, the first cutting insert 10, the spacer 40, and the second cutting insert 20 are arranged and accommodated in order in the accommodating portion 34 of the tool main body 30 from the side surface 33 side to the outer side of the tool main body 30. The fixing member 50 inserted into 42 and 24 is attached to the screw hole 38 and tightened, whereby the first and second cutting inserts 10 and 20 are fixed to the tool body 30 via the spacer 40 therebetween. At this time, the side surface 33 on the mounting side of the tool main body 30 is arranged so that one side surface of the first cutting insert 10 is in contact therewith and positioned there. Further, the first and second cutting inserts 10 and 20 are fixed to the tool body 30 so that the respective central axes in which the through holes 14 and 24 for attachment are formed are coaxial.

  The screw hole 38 which is an attachment hole is formed slightly above the location on the side surface 33 corresponding to the through holes 14 and 24 of the first and second cutting inserts 10 and 20 accommodated in the accommodating portion 34. . Thus, when both the cutting inserts 10 and 20 are attached to the tool body 30 by the fixing member 50 by shifting the axis of the attachment hole 38 and the axes of the through holes 14 and 24, the both cutting inserts 10 and 20 are directed downward in the figure. Thus, both cutting inserts 10 and 20 are slightly biased against the restraining surfaces 35 and 36. With the configuration in which such an urging force is applied, it is possible to suppress the occurrence of positional deviation (rotational deviation) due to the load in the machining direction that occurs during the machining of the two cutting inserts 10 and 20. , 20 is more reliably fixed.

  Next, a method for processing a workpiece using the cutting tool 1 having the above-described configuration will be described.

  First, the cutting tool 1 described above is attached to a cutting device to prepare for cutting. Further, in order to cut the workpiece, the workpiece is held and fixed to a predetermined holding device.

  Subsequently, the object to be processed held by the holding device is rotated, the cutting edges 11 and 21 of the cutting tool 1 are brought close to the rotating object to be processed, and cutting such as grooving is performed. Then, the cutting part is changed and other cutting processes are performed in the same manner to complete the product. According to this manufacturing method, since cutting can be performed without significantly reducing the rigidity of the tool body 30, efficient processing can be performed over a long period of time, thereby reducing the production cost of the product. it can.

  As described above, according to the cutting tool 1 according to the present embodiment, the cutting inserts 10 and 20 are fixed to the tool body 30 with the spacer 40 interposed therebetween. For this reason, the distance between the cutting inserts 10 and 20 can be easily secured by the spacer 40, and the cutting inserts 10 and 20 spaced apart by the spacer 40 can be collectively fixed to the tool body 30 by one fixing member 50. it can. Therefore, according to this cutting tool 1, since only one mounting hole 38 for attaching the fixing member 50 is required, it is possible to reduce the size of the cutting tool 1 without significantly reducing the rigidity of the tool body 30. Moreover, in the cutting tool 1 which concerns on this embodiment, since the insert seat process by the same process can be performed, it becomes difficult to generate | occur | produce the level | step difference in the longitudinal direction between the chips like the past, and higher quality cutting insert 1 and A cutting tool provided with the cutting insert 1 can be obtained.

  Further, in the cutting tool 1, the tool body 30 has a housing portion 34 that houses the cutting inserts 10, 20 at the distal end portion 31, and the housing portion 34 is at least one of the flat plate-shaped end surfaces of the cutting inserts 10, 20. The restraint surfaces 35 and 36 for restraining the portion are included. The cutting inserts 10 and 20 are fixed to the tool body 30 so as to be urged by the restraining surfaces 35 and 36. For this reason, the restraint surfaces 35 and 36 effectively prevent the positional displacement of the cutting inserts 10 and 20 due to the load during cutting, and secure the cutting inserts 10 and 20 and the tool body 30 more reliably. be able to.

  Moreover, in the cutting tool 1, the cutting inserts 10 and 20 are the same shape. For this reason, it is not necessary to prepare separate cutting inserts, and the configuration of the cutting tool 1 can be simplified. Further, the cutting inserts 10 and 20 are fixed to the tool body 30 so that the respective central axes are coaxial. For this reason, the positioning between the cutting inserts 10 and 20 is facilitated, and further, the processing shift due to the difference between the inserts during processing can be suppressed. Of course, the cutting inserts 10 and 20 may have different shapes depending on the required cutting, and in that case, more complicated cutting can be performed.

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, although the cutting tool provided with the two cutting inserts 10 and 20 was illustrated in the above embodiment, the number of cutting inserts is not limited to two, and each of the cutting inserts includes three or more cutting inserts. Each of the spacers 40 described above may be provided between the two. In this case, it is possible to perform more complicated processing or simultaneously cut a large number of locations. Moreover, since the spacer is used, even if the number of cutting inserts is increased, only one mounting hole 38 is required in principle, and many cutting inserts can be provided without significantly reducing the rigidity of the tool body. Is possible.

  Moreover, although the example which fixes each cutting insert 10 and 20 only by the restraint surfaces 35 and 36 and the fixing member 50 was shown in embodiment mentioned above, the press which the cutting tool 1 further presses the cutting insert 10 and 20 from upper direction is shown. (Not shown) may be provided. By fixing from above as well, the cutting inserts 10 and 20 can be more firmly fixed to the tool body 30.

  DESCRIPTION OF SYMBOLS 1 ... Cutting tool, 10 ... 1st cutting insert, 11 ... Cutting blade, 14, 24, 42 ... Through-hole, 20 ... 2nd cutting insert, 21 ... Cutting blade, 30 ... Tool main body, 31 ... Tip part, 34 ... accommodating portion, 35, 36 ... constraining surface, 40 ... spacer, 50 ... fixing member.

Claims (8)

A first cutting insert having a flat plate shape and having a cutting edge;
A second cutting insert having a flat plate shape and having a cutting edge;
A tool main body to which the first and second cutting inserts are attached to the distal end in the longitudinal direction;
A spacer having a predetermined thickness,
The cutting tool, wherein the first and second cutting inserts are fixed to the tool body with the spacer interposed therebetween.   The cutting tool according to claim 1, further comprising a fixing member that fixes the first and second cutting inserts and the spacer to the tool body. Each of the first and second cutting inserts and the spacer is provided with a through hole,
The cutting tool according to claim 2, wherein the fixing member is attached to the tool body through each through hole.   4. The cutting tool according to claim 3, wherein the through hole of the second cutting insert has a taper shape or a step shape from one to the other. The tool body has a receiving portion for receiving the first and second cutting inserts at a tip portion thereof, and the receiving portion is at least a part of a flat plate-shaped end surface of the first and second cutting inserts. Including a restraint surface that restrains
The cutting tool according to any one of claims 1 to 4, wherein the first and second cutting inserts are fixed to the tool body so as to be urged by the constraining surface.   The cutting tool according to any one of claims 1 to 5, wherein the first and second cutting inserts have the same shape.   The cutting tool according to any one of claims 1 to 6, wherein the first and second cutting inserts are fixed to the tool body such that the central axes are coaxial. Attaching the cutting tool according to any one of claims 1 to 7 to a cutting device;
Rotating the workpiece;
Performing a predetermined cutting process on the rotating workpiece using the cutting edge of the cutting tool;
A method for manufacturing a product, comprising:

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