JPH04109808U - broach tool - Google Patents

Abstract

(57) [Summary] [Purpose] To form the cutting edge and guide portion of the second rough edge portion following the first rough edge portion in which the cutting edge and notch are formed on the same plane perpendicular to the axial direction. Thus, a broach tool is provided in which the length of the broach tool is shortened as a whole, the rigidity is increased, and the durability of the cutting edge is improved. [Structure] In a broach tool, cutting blades 42a to 42c and guide grooves 44a to 4 are provided on the same surface perpendicular to the axial direction.
The first rough blade part 32 has a plurality of first cutting parts 40 formed alternately with 4c, and the first cutting part 4 has cutting blades 48a to 48c and guide parts 50a to 50c alternately formed in the same way.
The cutting part 31 is constituted by the second rough blade part 34 in which a plurality of blades 6 are disposed. The cutting edges 48a to 48c of the second rough blade part 34 are located corresponding to the guide grooves 44a to 44c of the first rough blade part 32, and the guide parts 50a to 50c of the second rough blade part 34
have substantially the same shape as the cutting edges 42a to 42c of the first rough edge portion 32, and are arranged corresponding to the positions thereof.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a broach tool, and more particularly, the present invention relates to a broach tool, and more particularly, the present invention relates to a broach tool, and more particularly, the present invention includes at least a first rough cutting edge portion and a second rough cutting edge portion. The cutting edge of the second cutting part and the guide part in the second rough cutting part are both axially The broaching tool is formed on a surface perpendicular to the broaching direction, shortening the overall length of the broaching tool and This invention relates to a broaching tool with significantly improved rigidity.

0002

[Conventional technology]

Traditionally, when drilling holes in molds and forged products, drill tools and broaching tools have been used. A reamer tool or a broach tool is used. Brochure related to conventional technology The reach tool is shown in FIGS. 16 to 19. In this broach tool 2, the cutting blade 4 is It basically consists of a first rough blade part 6, a second rough blade part 8, and a finishing blade part 10. ing. As shown in FIG. Cutting blades 12a, 12b, 12c and guide grooves 14a, 1 are equally divided along the three locations. 4b and 14c are formed to form a cutting part 15, and this cutting part 15 is formed along the axial direction. As shown in FIGS. 18 and 19, a plurality of rough blades are provided in the second rough blade portion 8 in the axial direction. A cutting edge part 16 formed over the entire circumference in orthogonal planes and the first rough edge part 6. This is caused by cutting by the cutting blades 12a, 12b, and 12c, and the cutting blade 12a , 12b, 12c and guides 18a, 18b, 18c having similar shapes are provided. , the guides 18a, 18b and 18c collectively form a guide portion 20. Ru. A plurality of the guide parts 20 and the cutting blade parts 16 are arranged alternately. .

0003 When drilling a hole in the workpiece, first, the guide of the first rough cutting edge part 6 is A broach guide (not shown) is brought into contact with the grooves 14a, 14b, and 14c, and the broach is The tool 2 is fixed at the position of the hole provided in the workpiece, and drawing cutting is performed. Next, the second When the rough blade part 8 faces the machining process, the broach guide is moved backward, and the cutting edge of the first rough blade part 6 is A guide 18a of the second rough blade part 8 is attached to the machining area cut by 12a, 12b, and 12c. 18b and 18c are inserted, and the cutting blade portion 16 remains in the hole formed in the workpiece. Then, the finishing blade part 10 is used to finish the entire inner circumference of the hole. (See Special Publication No. 1-17811).

0004

[Problem that the idea aims to solve]

In this broach tool 2, the first rough edge portion 6 is formed by the broach guide or , the second rough blade part 8 is guided to the machining part of the workpiece, so that the blowing during cutting is prevented. This has the advantage that bending of the reach tool 2 is prevented. However, in the second rough blade part 8 The cutting edge portion 16 and the guide portion 20 are formed separately and arranged alternately in the axial direction. As a result, the broaching tool 2 becomes longer as a whole. In addition, the first rough blade part 6 The machined parts cut by the cutting blades 12a, 12b, 12c and the gas inserted into the machined parts. Cutting applied to each cutting edge portion 16 of the second rough blade portion 8 by sliding with the idle portion 20 When the resistance becomes large and an attempt is made to reduce the cutting resistance at each cutting edge portion 16, The number of cutting edge portions 16 of the second rough edge portion 8 must be increased, and as a result, the overall This results in a problem that the broaching tool 2 becomes longer. Therefore, the broach tool 2 Due to lack of rigidity, the radial balance is lost during cutting, causing a force acting in the radial direction. There are problems in that machining accuracy deteriorates and the durability of the cutting edge portion 16 becomes poor.

[0005] The present invention was made to solve this kind of problem, and in particular, the second rough In the blade section, both the cutting edge and the guide section are formed on the same plane perpendicular to the axial direction. By arranging a plurality of guide parts along the axial direction, the broach We provide a broaching tool with the shortest possible tool length and further improved rigidity. The purpose is to

[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 rough blade part, and a second rough blade part that is coaxial with the first rough blade part and has a plurality of second cutting parts. In a broaching tool with The first rough blade part is a first cutting part in which a cutting blade arranged along the axial direction and a notch are formed. has The second rough blade part is arranged along the axial direction, and corresponds to the cutting edge position of the first rough blade part. A guide portion is formed, and a cutting edge is formed corresponding to the notch position of the first rough edge portion. It consists of a second cutting part, Both the guide part and the cutting edge in the second rough cutting part are formed on the same plane perpendicular to the axial direction. It is characterized by what has been achieved.

[0007] Furthermore, the present invention includes a first rough blade portion having a plurality of first cutting portions; a second rough blade part coaxial with the part and having a plurality of second cutting parts, and a second rough blade part coaxial with the second rough blade part; In a broach tool equipped with a finishing blade part that is a shaft and has a plurality of cutting edges, The first rough blade part is a first cutting part in which a cutting blade arranged along the axial direction and a notch are formed. has The second rough blade part is arranged along the axial direction, and corresponds to the cutting edge position of the first rough blade part. A guide portion is formed, and a cutting edge is formed corresponding to the notch position of the first rough edge portion. It consists of a second cutting part, Both the guide part and the cutting blade are formed on the same surface perpendicular to the axial direction, and the finishing blade part is formed on the same surface perpendicular to the axial direction. It is characterized by having a cutting edge arranged along the direction and a spline blade in which a notch is formed. be a sign.

[0008]

[Effect]

The broach tool according to the present invention has a first cutting part in which a cutting edge and a notch are formed. A second cutting portion following the first rough cutting portion is formed corresponding to the cutting edge position of the first rough cutting portion. The guide part and the cutting edge formed corresponding to the notch position of the first rough edge part are arranged as an axis. By forming the second cutting part on the same surface perpendicular to the direction, the second cutting part The cutting blade inserted into the machining area defined by the cutting edge of the first rough edge part reduces the vibration during cutting by the cutting edge of the first rough edge part. In addition, vibrations in the radial direction are also prevented from occurring. Also, blow In addition to making it possible to shorten the overall length of the tool, it is also possible to reduce the length of the finishing tool. By providing a line blade, a hole defined by the first rough blade part and the second cutting part is formed. A spline groove can be formed with high precision around the periphery.

[0009]

【Example】

A preferred embodiment of the broaching tool according to the present invention will be described, and please refer to the attached drawings. This will be explained in detail below.

0010 In FIGS. 1 to 4, reference numeral 30 indicates a broaching tool according to this embodiment. , this broach tool 30 has a first rough edge part 32 and a second rough edge part 32 constituting the cutting edge part 31. It basically consists of a blade part 34 and a finishing blade part 36.

[0011] The first rough cutting portion 32 is spaced apart from the end portion 38 of the broaching tool 30 by a predetermined distance. A plurality of cut portions 40 are arranged along the axial direction. This first cutting portion 40 is formed at the end portion 3 The diameter gradually increases from the 8th side, and the overall shape is conical. This first cutting As shown in FIG. 2, each of the portions 40 has cutting edges 42a, 42b, 42c and notches. Certain guide grooves 44a, 44b, and 44c extend equally along the circumference on a surface perpendicular to the axial direction. Three locations are formed alternately. Shape of each cutting edge 42a, 42b, 42c has a circular arc shape, and the guide grooves 44a, 44b, and 44c also have a circular arc shape. ing.

0012 The second rough blade part 34 is provided continuously and coaxially with the first rough blade part 32. 2nd rough blade The portion 34 has a plurality of second cutting portions 46 arranged along the axial direction. This second cutting As shown in FIG. The guide portions 50a, 50b, and 50c are both provided on the same plane orthogonal to the axial direction. They are formed at three locations, each equally divided along the circumference. Cutting blades 48a, 48b, 4 8c corresponds to guide grooves 44a, 44b, and 44c formed in the first rough blade portion 32. The outer peripheral edges of the cutting edges 42a, 42b of the first rough blade portion 32 are provided at corresponding positions. It has substantially the same diameter as the machined part cut at 42c. Moreover, the guide parts 50a, 50 b, 50c are cut by the cutting blades 42a, 42b, 42c of the first rough blade part 32, respectively. The cutting blades 42a, 42b have approximately the same shape (in this embodiment, a fan shape) as the machined part. , 42c.

[0013] The finishing blade part 36 is provided continuously and coaxially with the second rough blade part 34, and is located on the outer peripheral edge. A cutting edge is formed all around the circumference.

[0014] Next, the operation of the broach tool 30 configured as described above will be explained. .

[0015] First, as shown in FIG. A workpiece 58 with a pilot hole 56 defined by a drill or the like is placed with the holes 52 and 56 aligned with each other. Then, the workpiece 58 is fixed using a clamp member 60. of the work 58 Insert the end of the broaching tool 30 into the pilot hole 56, and insert the end into the broaching machine (not shown). Fixed to.

[0016] Next, slide the broach guide installed on this broach machine radially. In addition, as shown in FIG. Broach guides 62a, 62b, 62c are applied to guide grooves 44a, 44b, 44c. The broaching tool 30 is held at three points in contact with each other. Broaching under the biasing action of the broaching machine The tool 30 is directed downward from the pilot hole 56 of the workpiece 58 and begins to be pulled out. 1. The three cutting edges 42a, 42b, and 42c formed on the rough edge portion 32 cut the workpiece 58. Cut at fixed points. The inner surface of the prepared hole 56 is sequentially cut with the cutting blades 42a, 42b, and 42c. , while enlarging the processed portion, the broach guides 62a, 62b, 62c The bottoms of the guide grooves 44a, 44b, and 44c are moved toward the second rough blade portion 34. Ku.

[0017] At this time, the broach tool 30 vibrates if there is an imbalance in the cutting force in the radial direction. Or, the deformation may occur, but the guide grooves 44a, 44b, 44c may not be brought into contact with the guide grooves 44a, 44b, 44c. The broach guides 62a, 62b, and 62c fix the broach tool 30 and prevent vibration. Alternatively, deformation can be prevented. Furthermore, an attempt is made to define the workpiece 58. The precise position of a larger hole can be guided relative to the broaching tool 30. .

[0018] Then, when the terminal end of the first rough blade portion 32 approaches the pilot hole 56 of the workpiece 58, the blow The broaching guides 62a, 62b, and 62c retract toward a broaching machine (not shown), and separated from the idle grooves 44a, 44b, and 44c. Subsequently, the second rough blade part 34 cuts the workpiece. 58 into the prepared hole 56.

[0019] The guide parts 50a, 50b, 50c provided in the second cutting part 46 of the second rough blade part 34 are , have substantially the same shape as the cutting edges 42a, 42b, 42c of the first rough edge portion 32, and 42a, 42b, and 42c are formed at the same position in the axial direction. This is it The guide parts 50a, 50b, 50c are the cutting edges 42a, 42b of the first rough blade part 32, It is inserted into the three machined parts cut at 42c and comes into contact with the inner surface thereof. Also, the The cutting blades 48a, 48b, 48c of the second cutting part 46 are connected to the guide groove 44 of the first rough blade part 32. The remainder of the workpiece 58 that has not been cut by the steps a, 44b, and 44c is then cut. At this time, the cutting blades 48a, 48b, 48c and the guide portions 50a, 50b, 50c are Because they are formed on the same plane perpendicular to the The guide portions 50a, 50b, 50c that are in contact with the surface suppress the The side portions 50a, 50b, 50c are in contact with the guide grooves 44a, 44b, 44c. Since it plays the same role as the broach guides 62a, 62b, and 62c, It is possible to prevent vibration of the tool 30 in the lateral direction.

[0020] The cutting edges 48a, 48b, and 48c of the second rough edge portion 34 define the desired position. The entire inner circumference of the pilot hole 56 of the workpiece 58 is finished smooth with the finishing blade part 36. .

[0021] FIG. 7 shows another embodiment of the present invention, in which the same components as in the first embodiment are the same. Reference numerals are given, detailed explanations thereof are omitted, and the same applies hereinafter. This second embodiment This embodiment differs from the first embodiment in that the shape of the cutting edge of the second rough edge portion is changed.

[0022] In this case, the second rough blade part 34 is not shown, but is provided continuously to the first rough blade part 32. A plurality of second cutting portions 64 are arranged along the axial direction. This second cutting section 64 As shown in FIG. 7, the cutting blades 66a, 66b, 66c and the guide portions 50a, 50b , 50c are formed on the same plane perpendicular to the axial direction, and are equally divided into three parts along the circumference. formed in places. The cutting blades 66a, 66b, and 66c are provided on the first rough blade portion 32. These cutting edges 66 are formed at positions corresponding to the idle grooves 44a, 44b, and 44c. The shapes of a, 66b, and 66c are each formed flat so as to form a chord, and the adjacent gas The shape of the side portions 50a, 50b, and 50c is arcuate.

[0023] The second rough blade part 34 is formed by guide grooves 44a, 44b, and 44c of the first rough blade part 32. The remaining part of the workpiece 58 that has not been cut is then cut. At this time, the cutting blades 48a, 48 b, 48c and the guide portions 50a, 50b, 50c are on the same plane perpendicular to the axial direction. Since the vibration during cutting is caused by the guide part in contact with the inner surface of the hole in the workpiece, 50a, 50b, and 50c.

[0024] FIG. 8 shows yet another embodiment of the present invention. In this third embodiment, the first This embodiment differs from the first and second embodiments in that the shape of the guide groove in the rough blade portion has been changed.

[0025] The first cutting part 70 of the first rough blade part 32 has cutting blades 42a, 42b, 42c and notches. The guide grooves 72a, 72b, and 72c are formed on the same surface perpendicular to the axial direction. , are formed at three locations equally divided along the circumference. Cutting blades 42a, 42b, 42 The shape of c is an arc, and the guide groove 7 adjacent to the cutting edges 42a, 42b, 42c The shapes of 2a, 72b, and 72c are flat and chord-like. guide groove Broach guides 62a, 62b, 62c are in contact with 72a, 72b, 72c. Ru. Cutting blades 42a, 42b, 42c formed in the second cutting part 46 of the second rough blade part 34 The guide portions 50a, 50b, and 50c each have an arc shape, and these are combined. A broaching tool is constructed.

[0026] Note that a guide groove with an arcuate bottom is provided on the outer periphery of the first rough blade portion 32 of the broach tool 30. 44a, 44b, 44c, as shown in FIGS. A predetermined position of the broaching tool 30 fixed to the tool 74 is set so that a recess is formed in the polishing area 76. It is formed by grinding with a ground whetstone 78. On the other hand, the first broach tool 30 In order to define flat guide grooves 72a, 72b, and 72c on the outer periphery of the rough blade portion 32, as shown in FIG. 11 and 12, the predetermined position of the broach tool 30 fixed to the fixture 74 The position is formed by polishing the polishing portion 80 with a grindstone 82 having a flat surface. this In this case, the broaching tool 30 can be obtained easily and inexpensively.

[0027] FIG. 13 shows yet another embodiment of the present invention. In this fourth example, The first cutting part 84 of the first rough blade part 32 has guides adjacent to the cutting blades 42a, 42b, 42c. The curved portions 86a, 86b, and 86c are formed on the same plane perpendicular to the axial direction, and are arranged on the circumference. It is divided into three equal parts along the line. These guide parts 86a, 86b, 86c In this case, the cutting edge 4 is removed without forming the guide grooves in the first to third embodiments. The surface of the steel material between 2a, 42b, and 42c is cut to create flat guide portions 86a, 86b. , 86c are formed. These guide parts 86a, 86b, 86c are provided with broaches. Guides 62a, 62b, and 62c abut. In the second cutting part 46 of the second rough blade part 34 The formed cutting edges 42a, 42b, 42c and guide portions 50a, 50b, 50c are connected to each other. Each has an arc shape, and these are combined to form a broach tool.

[0028] The pilot hole 56 defined in the workpiece 58 may be formed during forging or drilled. The center position of the pilot hole 56 is the desired center position. This may cause misalignment. However, in this embodiment, the workpiece 58 is Since the workpiece 58 is fixed by the pump member 60, there is no possibility that the workpiece 58 will be displaced during cutting. The hole is cut with the broach tool 30 set at the desired position to improve the positional accuracy of the hole. can be raised.

[0029] Still another embodiment of the present invention is shown in FIGS. 14 and 15. In this fifth embodiment In this case, the finishing blade part 90 is provided continuously to the second rough blade part 34 and covers the entire outer peripheral edge. A plurality of spline-shaped cutting edges 92 are formed around the circumference.

[0030] The workpiece 5 defined at a desired position by the first rough blade part 32 and the second rough blade part 34 The pilot hole 56 of No. 8 has a spline groove defined on its inner surface by the cutting edge 92 of the finishing blade portion 90. It will be done.

[0031] In addition, in this embodiment, the cutting edges of the first rough edge portion and the second rough edge portion are aligned along the circumference. Although it is divided into three equal parts, it is not limited to this. 8 and the first cutting part shown in FIG. 13 and the second cutting part shown in FIG. Of course, it is also possible to construct a reach tool.

[0032]

[Effect of the idea]

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

[0033] Both the cutting edge and the guide part of the second rough edge part following the first rough edge part are aligned perpendicularly to the axial direction. By forming the broach on a flat surface, the length of the broach tool can be shortened as a whole, and the broach can be made rigid. Improves sexual performance. Also, the first rough blade part is held by a broach guide, and the second rough blade part is held by a broach guide. The portion is held by a guide portion inserted into the processed portion cut by the cutting edge of the first rough blade portion. This prevents deformation of the broach tool and improves the durability of the cutting edge. It is also possible to improve the positional accuracy of the holes.

[0034] Further, a finishing blade is inserted into the hole precisely defined by the first rough blade part and the second rough blade part. By cutting with the spline blade formed on the part, spline processing with excellent accuracy is possible. It becomes possible to carry out construction work.

[Brief explanation of drawings]

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

[Fig. 2] A- of the broach tool according to the present invention in Fig. 1.
FIG. 3 is a cross-sectional view of the cut portion taken along line a.

[Fig. 3] b- of the broaching tool according to the present invention in Fig. 1;
It is a sectional view of a guide part along line b.

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

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

FIG. 6 is a cross-sectional view of the broaching tool according to the present invention in a state where the broaching guide is in contact with the guide groove of the first rough edge portion.

FIG. 7 is a cross-sectional view of the guide portion of the second rough cutting edge in the second embodiment of the broaching tool according to the present invention.

FIG. 8 is a cross-sectional view of the cutting portion of the first rough edge portion in the third embodiment of the broach tool according to the present invention.

FIG. 9 is an explanatory diagram showing a polishing state in which an arcuate guide groove is formed at the bottom of the cutting portion of the first rough blade portion of the broach tool according to the present invention.

10: c of the broaching tool according to the present invention in FIG. 9;
It is a cross-sectional view of guide groove formation along line -c.

FIG. 11 is an explanatory diagram showing a polishing state in which a flat guide groove is formed in the cutting portion of the first rough edge portion of the broach tool according to the present invention.

FIG. 12 is a longitudinal sectional view of the guide groove formed along line dd of the broaching tool according to the present invention in FIG. 11;

FIG. 13 is a cross-sectional view of the cutting portion of the first rough edge portion in the fourth embodiment of the broaching tool according to the present invention.

FIG. 14 is a front view of a fifth embodiment of the broaching tool according to the present invention.

15 is a sectional view of the finishing blade portion of the broaching tool according to the present invention in FIG. 14, taken along line ee.

FIG. 16 is a front view of a conventional broaching tool.

FIG. 17 f of the prior art broaching tool in FIG.
It is a sectional view of the cutting part along the -f line.

[Fig. 18] g of the prior art broaching tool in Fig. 16;
It is a sectional view of the cutting part along the -g line.

FIG. 19: h of the prior art broaching tool in FIG. 16;
It is a sectional view of a guide part along line -h.

[Explanation of symbols]

30... Broach tool 32... First rough blade part 34... Second rough blade part 40, 70, 84... First cutting part 46, 64... Second cutting part 42a-42c, 48a-48c, 66a-66c... Cutting blade 44a to 44c, 72a to 72c...Guide grooves 50a to 50c, 86a to 86c...Guide portions 62a to 62c...Broach guide

Claims (4)

[Scope of utility model registration request] Claim 1: A first rough blade part having a plurality of first cutting parts; and a second rough blade part coaxial with the first rough blade part and having a plurality of second cutting parts. In the broach tool, the first
The rough blade part has a cutting blade disposed along the axial direction and a first cutting part in which a notch is formed, the second rough blade part is disposed along the axial direction, and the first rough blade a second cutting part in which a guide part is formed corresponding to the cutting edge position of the first rough cutting part, and a cutting edge is formed corresponding to the notch position of the first rough cutting part; A broach tool characterized in that both the broach and the cutting edge are formed on the same plane perpendicular to the axial direction. 2. The broach tool according to claim 1, wherein an arcuate groove is formed at the bottom of the notch of the first rough cutting portion, and the cutting edge of the second rough cutting portion is formed into a flat or arcuate shape. A broach tool that is characterized by: 3. The broach tool according to claim 1, characterized in that the notch of the first rough edge portion is formed flat, and the shape of the cutting edge of the second rough edge portion is formed flat or arcuate. broach tool. 4. A first rough blade portion having a plurality of first cutting portions; a second rough blade portion coaxial with the first rough blade portion and having a plurality of second cutting portions; In a broach tool that is coaxial with the second rough edge part and has a finishing edge part having a plurality of cutting edges, the first rough edge part has a cutting edge arranged along the axial direction and a first edge part in which a notch is formed. The second rough blade part has one cutting part, the second rough blade part is arranged along the axial direction, a guide part is formed corresponding to the cutting edge position of the first rough blade part, and the second rough blade part has a cutting part of the first rough blade part. It consists of a second cutting part in which a cutting edge is formed corresponding to the notch position, and both the guide part and the cutting edge are formed on the same surface perpendicular to the axial direction,
A broaching tool characterized in that the finishing blade portion has a spline blade arranged along the axial direction.