JPH04118922U - spline broach tool - Google Patents

Abstract

(57) [Summary] [Purpose] To form the cutting edge of the second cutting edge section following the first cutting edge section where the cutting edge and notch are formed and the guide section on the same plane perpendicular to the axial direction. This provides a spline broach tool with increased rigidity and improved durability of the cutting edge. [Configuration] Spline cutting blade group 2 on the same plane perpendicular to the axial direction
A first cutting edge portion 1 having a plurality of first cutting portions 18 in which guide grooves 0a to 20c and guide grooves 22a to 22c are alternately formed.
The spline broach tool 10 is composed of the second cutting part 14 having a plurality of second cutting parts 24 in which spline cutting blade groups 26a to 26c and guide parts 28a to 28c are alternately formed. The spline cutting blade groups 26a to 26c of the second cutting blade part 14 are located corresponding to the guide grooves 22a to 22c of the first cutting blade part 12, and the guide parts 28a to 28c of the second cutting blade part 14 are , have substantially the same shape as the spline cutting blade groups 20a to 20c of the first cutting blade portion 12, and are arranged corresponding to the positions thereof.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a spline broach tool, and more particularly to at least a first cutting edge. The guide part and the cutting edge in the second cutting edge are both axially to improve vibration resistance and rigidity during cutting. In addition, the notch in the first cutting edge part is supported by a broach guide, and the workpiece is accurately This invention relates to a spline broach tool that forms spline grooves.

0002

[Conventional technology]

Conventionally, when creating spline grooves on workpieces such as molds and forged products, Japanese Patent Application Laid-Open No. 61-7 As disclosed in Japanese Patent No. 9517, first, a desired setting position is set with respect to the workpiece. Accurately measure and drill at the set position based on the measurement results to drill the pilot hole. The positional accuracy of the pilot hole is improved by drilling and milling. Next, the Insert the spline broach tool using the inner surface of the pilot hole as a guide and perform pull-cutting. and simultaneously form a spline groove around the entire circumference of the pilot hole.

0003 In this way, the reason why the positional accuracy of the pilot hole is required for the workpiece is because of the spline block. Modification to improve the positional accuracy of the pilot hole when forming spline grooves using a tool This is because it becomes impossible.

0004

[Problem that the idea aims to solve]

However, in the conventional spline broach tool, the workpiece is In order to simultaneously cut a spline groove on the inner periphery of the pilot hole, a radial balancer is used. When the base collapses, a force acting in the radial direction on one side is generated, which gradually becomes unevenly distributed, resulting in poor machining accuracy. There is a problem that it worsens the cutting edge and the durability of the cutting edge. Also, it is possible to drill holes in the workpiece. It is necessary to improve the positional accuracy at the stage of preparing the pilot hole, which requires labor and effort for positioning. Drilling and milling will be performed to finish the stock holes, and the machining process will be delayed. There is a problem of decreased productivity as well as increased costs.

[0005] The present invention was made to solve this kind of problem, and the first cutting edge part When cutting with the guide member in contact with the notch and fixing the spline broach tool, In addition, the cutting blade and the guide part are formed on the same plane perpendicular to the axial direction in the second cutting blade part. By inserting the guide part into the cut part, the spline during cutting can be Process required to further improve the rigidity of the broach tool and improve the machining accuracy of the prepared hole The purpose is to provide a spline broach tool that makes it possible to omit the Ru.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a first cutter having a plurality of first cutting parts. a cutting edge portion; a second cutting edge portion coaxial with the first cutting edge portion and having a plurality of second cutting portions; In a spline broach tool equipped with The first cutting part has a first cutting part in which a cutting blade and a notch are formed along the axial direction, The second cutting edge portion is arranged along the axial direction, and corresponds to the cutting edge position of the first cutting edge portion. A guide portion is formed, and a cutting edge is formed corresponding to the notch position of the first cutting edge portion. a second cutting part; Both the guide portion and the cutting edge in the second cutting edge portion are formed on the same plane perpendicular to the axial direction. It is characterized by what has been achieved.

[0007] In addition, the present invention provides a cutting edge disposed along the axial direction and a first cutout formed with a notch. a first cutting edge portion having a cutting portion; The cutting edge of the first cutting edge portion is coaxial with the first cutting edge portion and is disposed along the axial direction. A guide portion is formed corresponding to the position and corresponding to the notch position of the first cutting edge portion. a second cutting edge portion having a second cutting portion in which a cutting edge is formed; A plurality of inner diameter machining fixtures are coaxial with the second cutting edge portion and are arranged along the axial direction. A raised blade part, It is characterized by having the following.

[0008]

[Effect]

In the spline broach tool according to the present invention, the guide member is provided in the notch of the first cutting edge portion. guide the spline broach tool to a predetermined position in the pilot hole of the workpiece, and The vibration during cutting by the cutting edge of the second cutting edge section is inserted into the machining area defined by the cutting edge of the first cutting edge section. The inserted guide section prevents vibrations in the radial direction and improves rigidity. make it possible to

[0009] In addition, by providing a finishing blade part after the second cutting blade part, it is possible to form a spline blade. It is possible to finish the inner diameter of a spline groove with high precision.

0010

【Example】

A preferred embodiment of the spline broach tool according to the present invention will be described and attached. A detailed description will be given below with reference to the drawings.

[0011] In FIGS. 1 to 4, reference numeral 10 indicates a spline broach according to the present embodiment. This spline broach tool 10 has a first cutting edge 12 and a second cutting edge. It basically consists of a blade part 14.

0012 The first cutting edge 12 is spaced a predetermined distance from the end 16 of the spline broach tool 10. A plurality of first cutting portions 18 are arranged along the axial direction. This first cutting part 18 The diameter gradually increases from the end 16 side, and the overall shape is conical. child As shown in FIG. 2, each of the first cutting portions 18 of the book) 20a, 20b, 20c and guide grooves 22a, 22b, 22c which are notches are formed at three alternate locations by equally dividing a surface perpendicular to the axial direction along the circumference. husband Each spline cutting edge group 20a, 20b, 20c has an arc shape, and The shapes of the idle grooves 22a, 22b, and 22c are also arcuate.

[0013] The second cutting edge portion 14 is provided continuously and coaxially with the first cutting edge portion 12 . 2nd cutting edge The portion 14 has a plurality of second cutting portions 24 arranged along the axial direction. This second cut As shown in FIG. 3, the cutting portion 24 has arc-shaped spline cutting blade groups 26a, 26b, 26c and the arcuate guide portions 28a, 28b, 28c are the same and perpendicular to the axial direction. It is provided on one surface, and is formed in three equal parts along the circumference. spry The cutting blade groups 26a, 26b, and 26c are arranged in guide grooves 22 provided in the first cutting blade portion 12. a, 22b, and 22c, and the outer peripheral edge thereof is located at the first cutting edge portion 12. A spline groove machined portion cut with the spline cutting blade groups 20a, 20b, and 20c. They have substantially the same diameter. Further, the guide portions 28a, 28b, and 28c are arranged in the first direction, respectively. Splines cut by the spline cutting blade groups 20a, 20b, and 20c of the cutting blade part 12 It has approximately the same shape as the grooved part, and the spline cutting blade groups 20a, 20b, 20c have are placed in corresponding positions.

[0014] Next, the operation of the spline broach tool 10 configured as described above will be explained. Explain.

[0015] First, as shown in FIG. A workpiece 36 with a pilot hole 34 defined by a drill or the like is placed with the holes 30 and 34 aligned with each other. Then, the work 36 is fixed using a clamp member 38. of the work 36 Insert the end of the spline broach tool 10 into the pilot hole 34, this end not shown. Fix it on the broaching machine.

[0016] Next, slide the broach guide installed on this broach machine radially. In addition, as shown in FIG. Broach guides 40a, 40b, 40c are applied to guide grooves 22a, 22b, 22c. The spline broach tool 10 is held at three points in contact with each other. Emphasis on broaching machine During use, the spline broach tool 10 is directed downward from the pilot hole 34 of the workpiece 36. The spline cutting edge group 20a formed at three locations on the first cutting edge portion 12 begins to be pulled out. Spline grooves are cut at predetermined locations on the workpiece 36 using 20b and 20c. spline The inner surface of the prepared hole 34 is sequentially cut with the cutting blade groups 20a, 20b, and 20c, and the processed portion is enlarged. While the broach is being sharpened, the broach guides 40a, 40b, 40c are in the guide groove 22a, The bottom portions of 22b and 22c are moved toward the second cutting edge portion 14.

[0017] At this time, the spline broach tool 10 has an unbalanced cutting force in the radial direction. If there is, vibration or deformation will occur, but the guide grooves 22a, 22b, 22c The broach guides 40a, 40b, and 40c in contact with the spline broach tool 10 can be fixed to prevent vibration or deformation. Furthermore, work 3 6. Use the spline broach tool 10 to locate the larger precision hole to be defined in the It can be induced against.

[0018] Then, when the terminal end of the first cutting edge 12 approaches the prepared hole 34 of the workpiece 36, the blow The broaching guides 40a, 40b, and 40c retract toward a broaching machine (not shown), and id grooves 22a, 22b, and 22c. Subsequently, the second cutting edge portion 14 cuts the workpiece. 36 into the prepared hole 34.

[0019] The guide parts 28a, 28b, 28c provided in the second cutting part 24 of the second cutting blade part 14 are , splines having the same shape as the spline cutting blade groups 20a, 20b, and 20c of the first cutting blade part 12. It has an in-groove and is axially aligned with the spline cutting blade groups 20a, 20b, 20c. are formed at the same location. As a result, the spline cutting edge group of the first cutting edge portion 12 It is inserted into the three spline grooves cut at 20a, 20b, and 20c, Get in touch with that inner world. Moreover, the spline cutting blade groups 26a and 26b of the second cutting blade part 14 , 26c are cut easily due to the presence of the guide grooves 22a, 22b, and 22c of the first cutting edge portion 12. The remaining part of the workpiece 36 that was not cut is cut.

[0020] In this way, in this embodiment, half of the cutting force is applied to the first cutting edge portion 12 during cutting. A radial imbalance may cause the spline broach tool 10 to vibrate or change. I try to shape it, but the broach pins that are in contact with the guide grooves 22a, 22b, 22c The id 40a, 40b, 40c fix the spline broach tool 10 and prevent vibration. or deformation can be prevented. Also, rather than trying to define on work 36, Precise hole position can be guided to the spline broach tool 10 .

[0021] Further, in the second cutting edge portion 14, spline cutting edge group cutting edges 26a, 26b, 26 c and the guide portions 28a, 28b, and 28c are formed on the same plane orthogonal to the axial direction. Since the vibration during cutting is caused by the guide that is in contact with the inner surface of the pilot hole 34 of the workpiece 36, While being suppressed by the guide portions 28a, 28b, 28c, the guide portions 28a, 28b, 28c is a broach guide that was in contact with the guide grooves 22a, 22b, and 22c. 40a, 40b, and 40c, so the spline broach tool 10 is This has the effect of preventing lateral vibration.

[0022] Next, other embodiments of the present invention will be described. In this case, the same components are given the same reference numerals, and detailed explanation thereof will be omitted.

[0023] The spline broach tool 10 shown in FIG. This embodiment differs from the first embodiment in the following points.

[0024] The first cutting part 43 of the first cutting part 12 has a spline cutting blade group (three in the figure) 44. a, 44b, 44c and the guide grooves 46a, 46b, 46c, which are notches, are aligned in the axial direction. It is formed on the same plane perpendicular to There is. The shape of each spline cutting edge group 44a, 44b, 44c is circular arc shape, Further, the shapes of the guide grooves 46a, 46b, and 46c are formed flat so as to form a chord. ing.

[0025] These guide grooves 46a, 46b, 46c are provided with a broach guide 40 with a flat tip. a, 40b, and 40c are in contact with each other. formed in the second cutting portion 18 of the second cutting edge portion 14. The spline cutting blade groups 26a, 26b, 26c and the guide portions 28a, 28b, 28c are Each has an arc shape, and these are combined to form the spline broach tool 10. configured.

[0026] In this embodiment, the shapes of the guide grooves 46a, 46b, 46c of the first cutting part 24 are Since the shape is flat like a chord, it can be guided by a flat whetstone. A broaching tool that can polish the grooves 46a, 46b, and 46c easily and inexpensively. There is an effect that you can get 10.

[0027] FIG. 8 shows yet another embodiment of the present invention. The spline block of this third embodiment In the reach tool 50, after the first cutting edge part 12 and the second cutting edge part 14, A finishing blade portion 52 is formed. This finishing blade part 52 is similar to the second cutting blade part 14. It is provided coaxially, and a cutting edge is formed over the entire circumference of the outer peripheral edge.

[0028] In this case, the finishing blade part 52 allows the first cutting blade part 12 and the second cutting blade part 14 to The entire inner circumference of the spline groove cut with this method can be finished smoothly.

[0029]

[Effect of the idea]

According to the spline broach tool according to the present invention, the following effects can be obtained.

[0030] The first cutting edge portion holds the notch with a broach guide, and the second cutting edge portion holds the notch with the first cutting edge portion. During cutting, the guide part inserted into the machined part cut by the cutting blade suppresses the Deformation of the cutting tool due to radial vibration can be prevented. Therefore, the durability of the cutting edge It also improves the positional accuracy of the spline groove defined on the workpiece. be able to.

[0031] Furthermore, by providing a finishing edge after the second cutting edge, the spline edge can be used to form shapes. The inner diameter of the formed spline groove can be finished with high precision.

[Brief explanation of drawings]

FIG. 1 is an external view of a spline broach tool according to the present invention.

FIG. 2 is a longitudinal cross-sectional view of the first cutting portion of the spline broach tool according to the present invention in FIG. 1 along line a-a;

FIG. 3 is a longitudinal sectional view of the first cutting portion of the spline broach tool according to the present invention in FIG. 1 along line bb.

FIG. 4 is a perspective explanatory view of a spline broach tool according to the present invention.

FIG. 5 is a partially omitted front view showing the spline broach tool according to the present invention inserted into a hole in a workpiece.

FIG. 6 is a cross-sectional view of the spline broach tool with the broach guide in contact with the guide groove of the first cutting edge.

FIG. 7 is a cross-sectional view of the second embodiment of the spline broach tool, with the broach guide in contact with the guide groove of the first cutting edge.

FIG. 8 is an external view of a third embodiment of the spline broach tool according to the present invention.

[Explanation of symbols]

10, 50...Spline broach tool 12...First cutting edge part 14...Second cutting edge part 18, 43...first cutting part 24...Second cutting part 20a-20c, 26a-26c...Spline cutting blade group 22a-22c...Guide groove 28a-28c...Guide part 40a-40c...brooch guide

Claims (3)

[Scope of utility model registration request] Claims: 1. A first cutting blade having a plurality of first cutting parts, and a second cutting blade having a plurality of second cutting parts, the second cutting part being coaxial with the first cutting part. In the spline broach tool, the first cutting part has a first cutting part in which a cutting blade and a notch are formed along the axial direction, and the second cutting part is disposed along the axial direction, and a second cutting section in which a guide section is formed corresponding to the cutting edge position of the first cutting edge section and a cutting edge is formed corresponding to the notch position of the first cutting edge section; A spline broach tool characterized in that both a guide portion and a cutting edge in the cutting edge portion are formed on the same plane perpendicular to the axial direction. 2. The spline broach tool according to claim 1, wherein the bottom of the notch of the first cutting edge is formed into an arcuate groove or a flat shape. 3. A first cutting part having a first cutting part in which a cutting blade is arranged along the axial direction and a notch is formed, the first cutting part is coaxial with the first cutting part and is axially a second cutting edge, which is disposed along A spline comprising: a second cutting edge portion having a cutting portion; and a plurality of finishing blade portions for inner diameter machining, which are coaxial with the second cutting edge portion and arranged along the axial direction. broach tool.