CN103009019A

CN103009019A - Machining method for torque transmission plate of speed changing box

Info

Publication number: CN103009019A
Application number: CN2011102896034A
Authority: CN
Inventors: 梁海
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-22
Filing date: 2011-09-22
Publication date: 2013-04-03

Abstract

A machining method for a torque transmission plate of a speed changing box belongs to the field of components of an automobile speed changing box and particularly relates to a machining technology for a torque transmission plate of an auxiliary box of the speed changing box. The machining method for the torque transmission plate of the speed changing box comprises the steps of precise casting and blanking, heat treatment and tempering, rough turning of two sides, rough turning of an inner hole, precise turning of two sides, rough grinding of two sides, precise turning of the inner hole, rough boring of a positioning hole, gear shaping, heat treatment and ion nitridation of a spline part, precise grinding of two sides, centering, precise boring of a positioning hole of the spline, lettering, inspection, washing and packaging. The defects of the existing manufacturing technology can be overcome. The qualification rate of torque transmission plate products in mass production through the machining method can reach 99.873 percent, the weight of the precise casting blank is reduced by about 22kg compared with that of a polishing plate, the material is saved, the machining efficiency is increased by about 60 percent, the cost is reduced, and the problems that the traditional torque transmission plate components are complicated in machining procedures, the rejection rate is high and the resource consumption is severe can be solved.

Description

Gearbox torsion pass plate processing method

Technical field

Patent of the present invention is applied to the automobile gearbox part field, is specifically related to a kind of processing technology of auxiliary box of automobile gear box torsion pass plate.

Background technology

China has become world car the first production and marketing big country, automobile is more and more universal, and the parts manufacturing technology of China's vehicle key is still waiting to promote, and automobile gearbox is as important its complex structure of parts of automobile, transmit the power of engine output, by the different torsion of gear change output; More and more miniaturization of gearbox, lightweight are also had higher requirement to parts performance wherein; Odd-side torsion pass plate is that a thin plate supports the torsion pass part in gearbox, be fixed on the gear box casing, carrying synchronization device cone ring, torsion pass plate part is that a centre has involute spline holes, the 40Cr metal plate of locating hole arranged outward, splined hole diameter 189mm, locating hole and spline position degree are less than 0.08, the thick 10mm of wooden partition, the flatness on plane is less than 0.05mm, the irregular thin plate of diameter 400mm, spline part requires the heat treatment surface hard, wear-resisting, and remainder can carry torsion, the about 4.2kg of fabricated part net weight.Routine techniques manufacturing process: forge blanking---cutting profile---heat treatment quenching and tempering---------rough turn---finish turning------bore hole---gear shaping---spline part heat treatment ionic nitriding------check---purged and packed of carving characters that finish grindes two that mills profile of roughly grinding two; Processes product 95% is scrapped routinely, mainly is that the spline heat treatment deformation causes position degree overproof, this outside lower heavily about 28kg of material blank that forges, and the processing cutting output of metal material is larger, and the effective rate of utilization of material is lower, and cost is higher.

Summary of the invention

Existing torsion pass plate manufacturing process: forge blanking---cutting profile---heat treatment quenching and tempering---------rough turn---finish turning------bore hole---gear shaping---spline part heat treatment ionic nitriding------check---purged and packed of carving characters that finish grindes two that mills profile of roughly grinding two; Scrapping by existing processes product 95%, mainly is that the spline heat treatment deformation causes position degree overproof, in addition, forges the heavily about 28kg of material blank, and the processing cutting output of metal material is larger, and the effective rate of utilization of material is lower, and cost is higher.

In order to solve the deficiency of existing manufacturing process technology, solve the problem that torsion pass plate part blank is heavy, the blank utilization rate is low, manufacturing procedure is many, percent defective is high, resource consumption is serious, the present invention proposes a kind of new manufacturing process.

Main technical schemes of the present invention: hot investment casting blanking---heat treatment quenching and tempering---rough turn two---rough turn endoporus---two of finish turnings------finish turning endoporus---heavy boring locating hole---gear shaping---spline part heat treatment ionic nitriding------spline centering right boring locating hole------check---purged and packeds of carving characters that finish grind two of roughly grinding two.

Beneficial effect: make in batches torsion pass panel products qualification rate by technical solution of the present invention and reach 99.873%, the heavily about 5.8kg of precision cast blank forges the about 22kg of whole plate weight saving, the design of two plane grooves has reduced allowance, improved working (machining) efficiency about 60%, greatly saved material, reduced cost, the product of its mechanical performance, mechanical property and whole plate is suitable; After the spline heat treatment, but use swelled spline centering right boring locating hole, the gap of eliminating spline reduces overproof the scrapping of position degree that heat treatment deformation causes.

Description of drawings

Torsion pass plate schematic perspective view.

The specific embodiment

Main technical schemes implementation step of the present invention: hot investment casting blanking---heat treatment quenching and tempering---rough turn two---rough turn endoporus---two of finish turnings------finish turning endoporus---heavy boring locating hole---gear shaping---spline part heat treatment ionic nitriding------spline centering right boring locating hole------check---purged and packeds of carving characters that finish grind two of roughly grinding two.

The implementation step:

1. the moulding of wax-pattern precision pouring is adopted in hot investment casting blanking, and profile and two sides symmetrical grooves disc are not processed, and thickness 14mm, endoporus stay 5mm allowance.

2. heat treatment quenching and tempering, quenching and tempering hardness HB229～269.

3. rough turn two, use Special lathe clamp, locate rough turn two with endoporus, end face, size is stayed 1.5mm, and flatness is less than 0.15.

4. rough turn endoporus is located, is clamped rough turn spline path, allowance 1mm with end face.

5. finish turning is two, uses Special lathe clamp, locates rough turn two with endoporus, end face, and size is stayed 0.8mm, and flatness is less than 0.10.

6. roughly grind two, size is stayed 0.3mm, and flatness is less than 0.05.

7. the finish turning endoporus is located, is clamped finish turning spline path with end face.

8. the heavy boring locating hole is located rough bore with the spline path, and 2mm is stayed in the locating hole aperture, and position degree is less than 0.3, and wherein two hole locations are less than 0.12, and the aperture size tolerance is less than 0.02mm.

9. gear shaping is located less than 0.12 hole with two hole locations, and the end face positioning compression carries out gear shaping.

10. spline part heat treatment ionic nitriding, nitrogenize layer depth 0.2～0.4mm, case hardness 〉=HV500.

11. finish grind two, correct grinding is to size, flatness is less than 0.04.

12. spline centering right boring locating hole, the crack anchor clamps but use special use swelled spline disappears, spline location end face compresses, and the right boring locating hole guarantees that aperture size, position degree are less than 0.08.

13. carve characters, each product is carved characters, but the tracing informations such as marking figure number, trade mark, code, processing batch number.

14. check is carried out layout inspection to the torsion pass panel products, forms survey report.

15. cleaning, packing, antirust, warehouse-in.

Claims

1. gearbox torsion pass plate processing method: hot investment casting blanking---heat treatment quenching and tempering---rough turn two---rough turn endoporus---two of finish turnings------finish turning endoporus---heavy boring locating hole---gear shaping---spline part heat treatment ionic nitriding------spline centering right boring locating hole------check---purged and packeds of carving characters that finish grind two of roughly grinding two.