CN101569946A

CN101569946A - Involute spline push broach

Info

Publication number: CN101569946A
Application number: CNA200910097693XA
Authority: CN
Inventors: 敬代云
Original assignee: ZHEJIANG SHUANGHUAN DRIVELINE CO Ltd
Current assignee: ZHEJIANG SHUANGHUAN DRIVELINE CO Ltd
Priority date: 2009-04-16
Filing date: 2009-04-16
Publication date: 2009-11-04

Abstract

The invention relates to an involute spline push broach, belonging to the technical field of push broaches of metal cutting tools. The involute spline push broach comprises a front pilot, a cutting part and a tool shank. The involute spline push broach is characterized in that a basal body of the cutting part is externally plated with a layer of carborundum with the thickness of 0.05mm to 0.20mm; and the reference circle tooth thickness at the rear end of the cutting part is larger than that of the front end of the cutting part by 0.02 to 0.10mm. The broach has high durability and long service life; a single cutting tool has processed parts in large quantities, and the cutter can be used repeatedly after the layer of carborundum reaches wearing limit and is plated with carborundum again.

Description

Involute spline push broach

Technical field

The invention belongs to metal cutting tool class push broach technical field, be specifically related to be applied to rectification, the push broach that the spline precision is recovered spline distortion after the heat.

Background technology

In the machine-building process, involute inner spline class part needs before heat treatment with involute spline broach broaching or pinion cutter slotting moulding, after Overheating Treatment is hardened, distortion to a certain degree can appear in spline, the spline precision also certain decline can occur, when this distortion shows as internal spline upper and lower side tapering and reference circle ellipse when comparatively serious, can have influence on the normal use of internal spline.General piece surface hardness after heat treatment is hardened can be very high, usually require to reach more than the 60HRC, so internal spline is revised very difficult.Have once in a while at present and adopt carbide alloy to push away (drawing) cutter to repair, but that carbide alloy pushes away the manufacturing cost and use cost of (drawing) cutter is very high, the easy tipping of point of a knife during use, and it is also very difficult to reface, and is not suitable for using in producing link in enormous quantities.

Summary of the invention

Patent of the present invention is hardened to heat treatment at the prior art existence, and the back involute inner spline carries out smart school cutter manufacturing cost height, the defective of the difficulty of refacing, its purpose is to provide a kind of be used to improve precision after the spline heat, low cost of manufacture, the durability height, the involute spline push broach that cutter hub can use repeatedly.

For realizing the object of the invention, adopt following technical scheme:

Purpose of the present invention is achieved through the following technical solutions:

A kind of involute spline push broach, comprise front pilot, cutting portion and handle of a knife, it is characterized in that: be coated with one deck diamond dust outside on the cutting portion matrix, the thickness of Buddha's warrior attendant layer of sand is 0.05mm～0.20mm, and the reference circle transverse tooth thickness of cutting portion rear end is than the big 0.02～0.10mm of value of cutting portion front end.

The thickness of described Buddha's warrior attendant layer of sand is 0.1mm～0.20mm

Involute spline push broach of the present invention is reserved the diamond dust thickness of appropriate granularity in advance on the reference circle transverse tooth thickness of spline push broach, evenly plate one deck diamond dust by electroplating at cutting portion, makes the push broach transverse tooth thickness behind the gold-plated emery meet the requirement of workpiece finished size.Choose the granularity of suitable diamond dust according to actual needs, Mohs' hardness can be chosen from 100～400, and it is good preferentially choosing 200#, must guarantee that the push broach reference circle transverse tooth thickness behind the gold-plated emery meets the requirement of finished product internal spline reference circle space width.

After workpiece to be machined heat treatment is hardened, use the push broach of involute spline Buddha's warrior attendant that the inner spline gear side is carried out finishing, by extruding and shear action, that layer of metal that distortion back flank is had more is extruded, thereby internally spline teeth, teeth directional, tooth pitch, etc. carry out a spot of correction, precision with after the raising spline heat guarantees that it can normally use.

Involute spline push broach of the present invention spline push broach compared to existing technology, its beneficial effect is:

(1) manufacturing cost reduces, and only is 1/3 of carbide alloy push broach.

(2) durability improves more than 5 times than carbide alloy push broach.

(3) single many cutter institute processing parts quantity.

(4) reusable, after the Buddha's warrior attendant layer of sand arrives the limit of wear, can return former diamond dust, cutter hub is reusable behind the electrogilding emery again.

Description of drawings

Fig. 1 is the outline drawing of push broach of the present invention.

Fig. 2 is the B-B place cut-away view of Fig. 1.

Fig. 3 is the enlarged drawing at C-C place among Fig. 1.

Fig. 4 is the enlarged drawing at B place among Fig. 1.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the present invention is done and to describe in further detail:

A kind of as Figure 1-3 involute spline push broach, comprise front pilot 1, cutting portion 2 and handle of a knife 3, the outer one deck Buddha's warrior attendant layer of sand 3 that is coated with on cutting portion 2 matrixes, the thickness of Buddha's warrior attendant layer of sand 3 is 0.05mm～0.20mm, the present invention adopts even-grained diamond dust, electroplates last layer diamond dust by electric plating method equably at cutting portion 2 matrix surfaces.On the cutting portion calibration knuckle-tooth of involute spline push broach before plating is thick, to reserve the pairing transverse tooth thickness value of the diamond dust granularity that to electroplate in advance, and the reference circle transverse tooth thickness (M) of cutting portion rear end 2b is greater than the reference circle transverse tooth thickness (M+ Δ M) of front end 2a, promptly Δ M is 0.02～0.10mm as shown in the figure, on the flank of cutting portion, form a positive cone, to guarantee that cutting portion is on uniformly-coating in the broaching process behind the diamond dust, the transverse tooth thickness of cutting teeth strengthens step by step, by cutting and squeezing action to the inner spline gear groove by tooth, that layer of metal that flank distortion after the internal spline heat has more is got rid of, thereby internal spline teeth, teeth directional, tooth pitch, Deng carrying out a spot of correction, with the precision after the raising spline heat.

Compliance test result: applicant company was at a kind of branch sleeve with internal spline of processing in 2008, internal spline adopts broaching layout processing, part is internal spline generation moderate finite deformation behind carburizing and quenching: the internal spline reference circle becomes ellipse, deviation from circular from reaches 0.080, tapering between two ends reaches 0.050, comprehensive drift can't feed, and bad ratio reaches 50%, and total bad quantity is 2000.If can not take corrective measure, the part that this batch is 2000 is only scrapped processing.Applicant company uses spline push broach of the present invention, the internal spline reference circle circularity of these 2000 products is finished to 0.020, tapering is finished to 0.010, product reaches the reference circle circularity 0.03 of drawing requirement, the requirement of tapering 0.02 fully, comprehensive drift can pass through smoothly, and comprehensive no-go gage can stop.

After adopting the Buddha's warrior attendant push broach, finishing effect to internal spline is very obvious, the utility model is compared existing carbide alloy push broach, its low cost of manufacture, durability improves several times than carbide alloy push broach, and prolong service life, single many cutter institute processing parts quantity, and the Buddha's warrior attendant layer of sand can be returned former diamond dust after arriving the limit of wear, and is promptly reusable behind the electrogilding emery again.

Claims

1, a kind of involute spline push broach, comprise front pilot, cutting portion and handle of a knife, it is characterized in that: be coated with one deck diamond dust outside on the cutting portion matrix, the thickness of Buddha's warrior attendant layer of sand is 0.05mm～0.20mm, and the reference circle transverse tooth thickness of cutting portion rear end is than the big 0.02～0.10mm of value of cutting portion front end.

2, a kind of according to claim 1 involute spline push broach, the thickness that it is characterized in that described Buddha's warrior attendant layer of sand is 0.1mm～0.2mm.

3, a kind of as claimed in claim 1 or 2 involute spline push broach, the Mohs' hardness that it is characterized in that described diamond dust is 100～400.

4, as a kind of involute spline push broach as described in the claim 3, the Mohs' hardness that it is characterized in that described diamond dust is 200.