CN216028449U

CN216028449U - Key groove broach

Info

Publication number: CN216028449U
Application number: CN202122308567.3U
Authority: CN
Inventors: 戴少杰; 戴志伟; 恽建琴
Original assignee: Changzhou Zhiwei Tools Co ltd
Current assignee: Changzhou Zhiwei Tools Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-03-15
Anticipated expiration: 2031-09-23

Abstract

The utility model relates to a keyway broach, which comprises a hilt and a tool head, wherein a plurality of tool teeth are arranged on the upper surface of the tool head, chip pockets are formed between adjacent tool teeth, each tool tooth comprises a flat cutting tooth section and a groove cutting tooth section, the flat cutting tooth section is positioned at the foremost end of the tool head and is provided with 5 tool teeth, the groove cutting tooth section consists of an equal groove cutting tooth section and an increasing groove cutting tooth section, the tool teeth of the equal groove cutting tooth section are the same in width and are all 2mm, the increasing groove cutting tooth section is also provided with 5 tool teeth, and the tooth widths of the 5 tool teeth are sequentially increased by 0.1 mm. The utility model can ensure that the broach can be accurately processed, has high processing efficiency, long service life and processing cost saving, and meets the requirements on processing precision.

Description

Key groove broach

Technical Field

The utility model relates to the technical field of cutters, in particular to a key groove broach.

Background

Broaches are formed tools used for broaching that have rows of teeth on their surface that increase and change in size and shape from the cutting end to the cutting end. As the broaching tool makes a broaching motion, each tooth cuts a thickness of metal from the workpiece to a desired size and shape. Broaches are commonly used in the machining of round holes, splined holes, keyways, flats, contoured surfaces, etc. in both batch and mass production with high productivity.

The problems of unstable quality, quick abrasion, short service life and the like of a broaching product easily occur in actual production of the conventional keyway broaching tool, so that the processing cost is high.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: overcomes the defects in the prior art and provides a key groove broach.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a keyway broach, includes handle of a knife and cutter head, be equipped with a plurality of sword teeth on the upper surface of cutter head, form the chip groove between the adjacent sword tooth, the sword tooth includes truncation tooth section and groove truncation tooth section, truncation tooth section is located the foremost of cutter head, and has 5 sword teeth, groove truncation tooth section comprises halving groove truncation tooth section and increasing progressively groove truncation tooth section, the sword tooth width of halving groove truncation tooth section is the same, is 2mm, it also has 5 sword teeth to increase progressively groove truncation tooth section, and 5 sword teeth's tooth width increases 0.1mm in proper order.

The cutter head is divided into a flat cutting tooth section, an equally-divided groove cutting tooth section and an increasingly-increased groove cutting tooth section, so that the cutting of the key groove can be completed in sequence, the machining efficiency is high, the machining precision meets the requirement, and the service life is long.

Further inject, the groove gear cutting section includes first sword tooth and the second sword tooth that the interval set up, the equipartition has 3 chip separating grooves on the first sword tooth, the equipartition has 4 chip separating grooves on the second sword tooth, the chip separating groove is V type structure.

So set up, prevent long-pending bits, guarantee broach's reliability and life.

Further define, the width increases in proper order after going to the chip groove, and the groove depth of chip groove is 0.4 ~ 0.6mm, and the angle of opening of chip groove is 70 ~ 90.

So set up, reduce the friction between sweeps and the broach, guarantee the broaching quality.

Further, the front angle of the cutter tooth is 11-13 degrees, and the top back angle is 5-8 degrees.

By the arrangement, the broach can be accurately machined, and the machining precision is guaranteed.

Further, the number of the cutter teeth is 40-60.

Further limit, the chip pocket is the U-shaped structure of slope, and the width of chip pocket is 4mm, and its degree of depth is 2 ~ 3 mm.

So set up, guarantee that the chip removal is smooth and easy, the processing of being convenient for.

Further, the tool holder and the tool head are made of hard alloy.

So set up, guarantee that the broach obtains improving in aspects such as intensity, toughness, wearability for the life and the cutting strength of broach improve.

The utility model has the beneficial effects that: the utility model can ensure that the broach can be accurately processed, has high processing efficiency, long service life and processing cost saving, and meets the requirements on processing precision.

Drawings

The utility model is further described with reference to the following figures and embodiments.

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an enlarged schematic view of the structure at I in fig. 1.

Fig. 3 is a sectional view in the direction C-C in fig. 1.

Fig. 4 is a top view of fig. 1.

FIG. 5 is a view of FIG. 4

The enlarged structure of the figure.

In the figure: 1. the cutter comprises a cutter handle, 2 cutter heads, 21 cutter teeth, 22 chip grooves, A flat cutting tooth sections, B groove cutting tooth sections, B1 equal dividing groove cutting tooth sections, B2 increasing groove cutting tooth sections, B3 first cutter teeth, B4 second cutter teeth and 211 chip dividing grooves.

Detailed Description

The utility model will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1 to 5, a keyway broach comprises a handle 1 and a tool head 2 which are made of hard alloy, wherein 50 tool teeth 21 are arranged on the upper surface of the tool head 2, the front angle γ of each tool tooth 21 is 12 °, the top relief angle α is 6 °, chip flutes 22 are formed between adjacent tool teeth 21, each chip flute 22 is of an inclined U-shaped structure, the width of each chip flute 22 is 4mm, the depth of each chip flute 22 is 2.7mm, and the chip flutes 22 can reserve a storage space for pulled waste chips;

cutter tooth 21 includes flat cutter tooth section A and groove cutter tooth section B, flat cutter tooth section A is located cutter head 2's foremost, and has 5 cutter teeth 21, groove cutter tooth section B comprises partition groove cutter tooth section B1 and increment groove cutter tooth section B2, the cutter tooth 21 width of partition groove cutter tooth section B1 is the same, be 2mm, it also has 5 cutter teeth 21 to increment groove cutter tooth section B2, and 5 cutter teeth 21's tooth width increases 0.1mm in proper order.

The groove cutting tooth section B comprises a first cutter tooth B3 and a second cutter tooth B4 which are arranged at intervals, 3 chip separating grooves 211 are evenly distributed on the first cutter tooth B3, 4 chip separating grooves 211 are evenly distributed on the second cutter tooth B4, and the chip separating grooves 211 are of a V-shaped structure. The width of the chip dividing groove 211 is gradually increased from front to back, the depth of the chip dividing groove 211 is 0.5mm, the opening angle of the chip dividing groove 211 is 80 degrees, the chip dividing groove 211 can divide waste chips to reduce the shape of the waste chips, and the waste chips can be conveniently discharged.

In order to ensure that the surface of the broach does not have defects such as cracks and bruises that affect the performance of the broach when the broach of this embodiment is machined, the edge of the cutter teeth 21 is sharp, and there are no burrs, chipping, and grinding burns, and the connection between the chip pockets 22 and the cutter teeth 21 is smooth.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a keyway broach, includes handle of a knife and cutter head, its characterized in that: be equipped with a plurality of sword teeth on the upper surface of cutter head, form the chip pocket between the adjacent sword tooth, the sword tooth includes straight cut tooth section and groove cutting tooth section, straight cut tooth section is located the foremost of cutter head, and has 5 sword teeth, groove cutting tooth section comprises equal partition groove cutting tooth section and increase progressively groove cutting tooth section, the sword tooth width of equal partition groove cutting tooth section is the same, is 2mm, increase progressively groove cutting tooth section and also have 5 sword teeth, and 5 sword teeth's tooth width increases 0.1mm in proper order.

2. The keyway broach according to claim 1, wherein: the groove gear cutting section comprises a first cutter tooth and a second cutter tooth which are arranged at intervals, 3 chip separating grooves are evenly formed in the first cutter tooth, 4 chip separating grooves are evenly formed in the second cutter tooth, and the chip separating grooves are of a V-shaped structure.

3. The keyway broach according to claim 2, wherein: the width increases in proper order after going to the chip groove, and the groove depth of chip groove is 0.4 ~ 0.6mm, and the angle that opens of chip groove is 70 ~ 90.

4. The keyway broach according to claim 1, wherein: the rake angle of the cutter tooth is 11-13 degrees, and the top relief angle is 5-8 degrees.

5. The keyway broach according to claim 4, wherein: the number of the cutter teeth is 40-60 teeth.

6. The keyway broach according to claim 1, wherein: the chip pocket is the U-shaped structure of slope, and the width of chip pocket is 4mm, and its degree of depth is 2 ~ 3 mm.

7. The keyway broach according to claim 1, wherein: the tool handle and the tool head are made of hard alloy.