Hard scraping broach for machining high-hardness materials

Abstract

The utility model relates to the technical field of broaching tools, in particular to a hard scraping broaching tool used for machining high-hardness materials. In order to solve the problems that when a traditional broach is used for machining high-hardness materials, abrasion of the broach is serious, precision is not easy to guarantee, and machining efficiency is low, the novel hard scraping broach used for machining the high-hardness materials comprises a front handle part, a neck part, a front guide part, a broach tooth part, a cross-shaped connecting key sleeve, a locking threaded sleeve, a rear guide part and a rear handle part. The cutter tooth part is made of hard alloy materials, the cross-shaped connecting key sleeve is located between the front guide part and the cutter tooth part, external threads are arranged on the rear guide part, and the locking thread sleeve is connected to the rear guide part in a threaded mode and abuts against the rear end face of the cutter tooth part. According to the hard scraping and broaching tool, the service life of the tool is prolonged, and meanwhile the machining efficiency and the machining quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to broach technical field, concretely is a kind of hard scraping broach for processing high-hardness material. BACKGROUND

[0002] High-hardness material is usually manufactured into various wear-resistant components and high-strength structural parts due to its superior wear resistance, corrosion resistance and high strength, and such structural parts are usually used in key parts (such as engine, instrument panel and other parts) of aerospace field, large ships and heavy machinery, and these key parts usually need to be processed into high-precision holes, and the engine and other parts also need to be processed into high-precision spline holes.

[0003] In the prior art, a broach is generally used to process high-precision holes. The conventional broach includes, from front to back, a front handle portion, a neck portion, a front guide portion, a tooth portion, a rear guide portion and a rear handle portion, and the broach is generally made of high-speed steel, and low-speed broaching is used during broaching. Therefore, when processing high-hardness material, the broach is severely worn, the precision is not easy to guarantee, and the processing efficiency is low. Moreover, the wear of the broach is mainly in the tooth portion, and since the conventional broach is an integrated broach, the entire broach needs to be replaced when the tooth portion is worn, and the cost is high. SUMMARY

[0004] The utility model discloses a kind of hard scraping broaches for processing high-hardness material to solve the problem that the conventional broach is severely worn, the precision is not easy to guarantee, the processing efficiency is low and the replacement cost is high when processing high-hardness material.

[0005] The utility model is implemented by the following technical solutions:

[0006] A kind of hard scraping broach for processing high-hardness material, including front handle portion, neck portion, front guide portion, tooth portion, cross coupling key cover, locking screw sleeve, tooth portion is made of hard alloy material, the center portion of the rear end face of front guide portion integrally extends with positioning rod, the rear end portion of positioning rod is equipped with rear guide portion and rear handle portion, the center of tooth portion is equipped with positioning hole, positioning hole and the middle part clearance of positioning rod cooperate, cross coupling key cover is located between front guide portion and tooth portion, cross coupling key cover includes the clearance fit connection of the front end portion of the positioning rod with the shaft sleeve, the front end face and rear end face of shaft sleeve are respectively fixed with front positioning key and rear positioning key, shaft sleeve is set on the front end portion of positioning rod, the rear end face of front guide portion is equipped with the front key groove of the front positioning key of cross coupling key cover adaptation, the front end face of tooth portion is equipped with the rear key groove of the rear positioning key of cross coupling key cover adaptation, rear guide portion is equipped with external thread, locking screw sleeve is screwed on rear guide portion and is tightly pressed on the rear end face of tooth portion.

[0007] When using, workpiece is sleeved from the front of broach, then the front handle portion of hard scraping broach is fixed to broaching machine, and then workpiece is abutted against flange plate on broach, and then processing can be carried out.

[0008] Principle: The cutter tooth part is made of hard alloy material, which improves the service life of the cutter, is suitable for machining high-hardness materials, and the hard alloy material is suitable for high-speed cutting, which improves the machining efficiency and the machining quality; in addition, the split broach structure is adopted, when the cutter tooth part is worn, only the cutter tooth part needs to be replaced, and the replacement cost is low.

[0009] Further, the front positioning keys are two and are distributed on the front end face of the shaft sleeve, the front key grooves are two, the rear positioning keys are two and are distributed on the rear end face of the shaft sleeve, and the rear key grooves are two, further improving the stability of the overall structure.

[0010] Further, the cutter tooth on the cutter tooth part is a spline tooth, which is convenient for machining the spline hole.

[0011] The hard scraping broach has the advantages that the service life of the cutter is improved, and the machining efficiency and the machining quality are improved; in addition, the cutter adopts the split broach structure, when the cutter tooth part is worn, only the cutter tooth part needs to be replaced, and the replacement cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0012] The drawings incorporated into the description and forming a part of the description, show the embodiments consistent with the present application, and together with the description, are used to explain the principle of the present application.

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced, and obviously, other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 It is the overall structure schematic diagram of the hard scraping broach;

[0015] Figure 2 It is the use state diagram of the hard scraping broach;

[0016] Figure 3 It is the structure schematic diagram of the cross coupling key sleeve;

[0017] Figure 4 It is Figure 3 The left view;

[0018] Figure 5 It is Figure 3 The right view.

[0019] In the figure: 1-fore handle, 2-neck, 3-fore guide, 4-cutter tooth, 5-cross coupling key cover, 51-bush, 52-fore positioning key, 53-rear positioning key, 6-locking screw cover, 7-rear guide, 8-rear handle, 9-workpiece, 10-flange. DETAILED DESCRIPTION

[0020] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the following will further describe the present application. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the description, it should be noted that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; Obviously, the examples in the description are only a part of the examples of the present application, not all examples.

[0023] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0024] As Figures 1 to 5 shown, a hard scraping broach for machining high-hardness materials, comprising a fore handle 1, a neck 2, a fore guide 3, a cutter tooth 4, a cross coupling key cover 5, a locking screw cover 6, the cutter tooth 4 is made of hard alloy material, a positioning rod is integrally extended axially from the center of the rear end surface of the fore guide 3, the rear end part of the positioning rod is provided with a rear guide 7 and a rear handle 8, the center of the cutter tooth 4 is provided with a positioning hole, the positioning hole is in clearance fit with the middle part of the positioning rod, the cross coupling key cover 5 is located between the fore guide 3 and the cutter tooth 4, the cross coupling key cover 5 comprises a bush 51 in clearance fit connection with the front end part of the positioning rod, the front end surface and the rear end surface of the bush 51 are respectively fixed with a fore positioning key 52 and a rear positioning key 53, the bush 51 is sleeved on the front end part of the positioning rod, the rear end surface of the fore guide 3 is provided with a fore key groove matched with the fore positioning key 52 of the cross coupling key cover 5, the front end surface of the cutter tooth 4 is provided with a rear key groove matched with the rear positioning key 53 of the cross coupling key cover 5, the rear guide 7 is provided with external threads, and the locking screw cover 6 is threadedly connected to the rear guide 7 and tightly presses against the rear end surface of the cutter tooth 4.

[0025] In use, the workpiece 9 is sleeved in the front part of the broach, then the front handle part 1 of the hard scraping broach is fixed to the broaching machine, and then the workpiece 9 is abutted against the flange plate 10 on the broach, and the machining can be carried out.

[0026] Principle description: the cutter tooth part 4 is made of hard alloy material, which improves the service life of the cutter, is suitable for machining high-hardness materials, and the hard alloy material is suitable for high-speed cutting, which improves the machining efficiency and the machining quality; in addition, the split broach structure is adopted, when the cutter tooth part 4 is worn, only the cutter tooth part 4 needs to be replaced, and the replacement cost is low.

[0027] In specific implementation, the front positioning keys 52 are two and are distributed on the front end surface of the shaft sleeve 51, the front key grooves are two, the rear positioning keys 53 are two and are distributed on the rear end surface of the shaft sleeve 51, and the rear key grooves are two, which further improves the stability of the overall structure.

[0028] In the specific implementation, the cutter teeth on the cutter tooth part 4 are spline teeth, which are convenient for machining spline holes.

[0029] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. A hard scraper for machining high-hardness materials, characterized in that, The device includes a front shank (1), a neck (2), a front guide (3), a cutting tooth (4), a cross-shaped connecting key sleeve (5), and a locking screw sleeve (6). The cutting tooth (4) is made of hard alloy material. A positioning rod extends axially from the center of the rear end face of the front guide (3). The rear end of the positioning rod is provided with a rear guide (7) and a rear shank (8). The center of the cutting tooth (4) is provided with a positioning hole, which is clearance-fitted with the middle part of the positioning rod. The cross-shaped connecting key sleeve (5) is located between the front guide (3) and the cutting tooth (4). The cross-shaped connecting key sleeve (5) includes a section between the front end of the positioning rod and the front end of the positioning rod. The bushing (51) is fitted with a clearance fit. The front end face and the rear end face of the bushing (51) are respectively fixed with a front positioning key (52) and a rear positioning key (53). The bushing (51) is fitted onto the front end of the positioning rod. The rear end face of the front guide part (3) is provided with a front keyway that matches the front positioning key (52) of the cross-shaped key sleeve (5). The front end face of the cutting tooth part (4) is provided with a rear keyway that matches the rear positioning key (53) of the cross-shaped key sleeve (5). The rear guide part (7) is provided with an external thread. The locking screw sleeve (6) is threaded to the rear guide part (7) and pressed against the rear end face of the cutting tooth part (4).

2. The hard scraper for machining high-hardness materials according to claim 1, characterized in that, There are two front locating keys (52) and they are distributed on the front end face of the bushing (51) to the left and right. There are two front keyways. There are two rear locating keys (53) and they are distributed on the rear end face of the bushing (51) to the left and right. There are two rear keyways.

3. A hard scraper for machining high-hardness materials according to claim 2, characterized in that, The cutting teeth on the cutting tooth section (4) are spline teeth.

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