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Combined technology for milling and grinding tooth parts of spiral taper gear

A technology of spiral bevel gear and combined process, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems that the tooth surface error cannot be completely eliminated, the heat treatment deformation error, the one-time investment of equipment is large, and the adjustment of machine tools is complicated, so as to reduce equipment Effects of investment, improvement of production efficiency, and simplified process flow

Inactive Publication Date: 2007-05-09
ZHUZHOU GEAR CO LTD
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AI Technical Summary

Problems solved by technology

These three processing techniques have their own advantages and disadvantages. The first technique is simple, but the precision is not high; Completely eliminate the tooth surface error and improve the tooth surface accuracy, but the high-precision spiral bevel gear adopts the process of grinding both the basin tooth and the corner tooth, which belongs to the typical space surface hard tooth surface processing. The adjustment of the machine tool is complicated, the manufacturing cost is high, and the production The efficiency is low, the production cycle is long, and the one-time investment in equipment is quite large. Therefore, the cost price of a gear grinding process of the spiral bevel gear is equivalent to the price of the finished product of the second method of processing the helical gear, and the gear grinding makes the effective hardness layer depth of the tooth surface Reduced by 0.2-0.3mm, expensive

Method used

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Embodiment Construction

[0013] Process of the present invention is described in detail below:

[0014] For a driven wheel with a diameter of φ450mm and a number of teeth of 43 teeth, the process is: forging billet: outer diameter φ460mm, inner hole φ220mm, thickness 71mm—pre-heat treatment, normalizing: temperature 920-950°C, time 2-2.5 hours, surface The hardness is 156~207HBS—car blank—milling teeth—chamfering, cleaning—heat treatment: carburizing and quenching temperature is 20-24 hours, of which the carburizing temperature is 920-930°C, and the diffusion temperature is 920-930°C , the holding temperature is 830-850°C, the quenching temperature is 830-850°C, the effective hardened layer depth is 1.7-2.1mm, the surface hardness is 58-63HRC, the core hardness is 33-45HRC, retained austenite, martensite, carbonization Grades 1 to 4, surface non-martensitic depth less than 0.02mm, - fine grinding inner hole and positioning end face - grinding bruises, surface roughness of grinding teeth is Ra0.8.

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Abstract

A grinding and abrading combined technology for machining the teeth of a pair of drive and driven spiral bevel gears includes such steps as forging, heat treating in advance, turning the raw teeth, grinding the primary locating position, milling spiral teeth, machining before heat treating (including tapping, chamfering and washing of driven gear and chamfering, milling spline and spiral threads and wash of drive gear, fine grinding, abrading between the drive and driven gears in a pair, and numbering them.

Description

Technical field: [0001] The invention belongs to the gear processing technology, in particular to the processing technology for the tooth part of the spiral bevel gear used in the drive axle transmission of automobiles. Background technique: [0002] The tooth processing technology of the driven wheel (referred to as "basin tooth") and driving wheel (referred to as "corner tooth") of the spiral bevel gear generally has the following three types. The wheels are respectively forged - pre-heat treatment - tooth blank turning - rough grinding of the main positioning part - helical tooth milling - pre-heat treatment processing (tapping, chamfering, cleaning of the driven wheel; driving wheel Chamfering, spline milling, thread milling, cleaning) - heat treatment - fine grinding (following wheel fine grinding inner hole and end face; driving wheel fine grinding main journal) - paired grinding and bruising - finished product pairing - storage. The second method adopts the process ...

Claims

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Application Information

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IPC IPC(8): B23P15/14C21D11/00C21D9/32
Inventor 谢耀东雷克干胡登云
Owner ZHUZHOU GEAR CO LTD
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