Manufacturing process for bearing plate of planetary carrier of automobile CVT automatic transmission

Abstract

The invention discloses a manufacturing process for a bearing plate of a planetary carrier of an automobile CVT automatic transmission. The manufacturing process comprises the following steps: (1) blanking; (2) blank making before warm forging; (3) shot blasting; (4), warm forging and extrusion forming: heating a blank to 210+/-20 DEG C, coating graphite, then continuing to heat to 820-860 DEG C, firstly upsetting and extruding and then performing backward extrusion forming to form a round plate and forming a metal ring vertically extending to one side on the edge of the circumference of the round plate, and then punching a central hole of the round plate; (5) residual heat annealing; (6) blank making and shot blasting after the warm forging; (7) lubricating treatment; (8) outer tooth forming by cold forging extrusion: placing the lubricated blank into a female die, and performing cold extrusion to form an outer gear ring; and (9) nitriding, wherein an effective oxide layer on the surface has a depth of 0.007-0.3mm. The manufacturing process is reasonable in technical route, metal flows are not cut off, a tooth surface strength of the product is high, raw materials are saved, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of forging and forming, and in particular relates to a temperature-cooling composite forging and extrusion forming process for a CVT automatic transmission planet carrier bearing plate. Background technique [0002] The planet carrier plate is used for fixing and transmission in the automatic transmission of automobiles. The end face of the bottom plate is connected with the planet carrier, and the outer teeth play the role of transmission. At present, the tooth blank is generally forged by hot forging technology, and then inserted by general cutting technology. The disadvantage is that the cutting production efficiency is low, and it is only suitable for single-piece or small-batch production applications. Secondly, the cutting process is used to form the tooth surface. Although it can be easily mass-produced, the investment in gear shaping processing equipment Large, low production efficiency, waste of raw...

AI Technical Summary

Problems solved by technology

[0002] The planet carrier plate is used for fixing and transmission in the automatic transmission of automobiles. The end face of the bottom plate is connected with the planet carrier, and the outer teeth play the role of transmission. At present, the tooth blank is generally forged by hot forging technology, and then inserted by general cutting technology. The disadvantage is that the cutting production efficiency is low, and it is only suitable for single-piece or small-batch production applications. Secondly, the cutting process is used to form the tooth surface. Although it can be easily mass-produced, the investment in gear shaping processing equipment Large, low production efficiency, waste of raw materials, high cost, cut metal flow line, low tooth surface strength, prone to tooth damage and can not be shifted

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