Self-changing gearbox flywheel bracket tray deep-drawing hammer down forming process and mould

Abstract

The invention discloses a method and a die for warm deep drawing and upsetting of automatic transmission flywheel pallet, and belongs to a method and a die for plastic forming of metal materials. The invention solves the problems that the prior process and die for cold stamp forming can form small pallet like parts by using only low-strength, high-plasticity carbon thin steel plate as blank materials and a process and a die for forming large pallet like parts by using No. 45 medium carbon thick steel plate with high strength and low plasticity as blank materials are not available, and is used for forging automatic transmission flywheel pallet for cars. The forming process of the invention comprises a heating step and a forming step and has the advantages of short and reasonable process flow and stability. The die of the invention comprises a deep drawing lower die, an ejecting device, a deep drawing and upsetting upper die and a guiding device, and has the advantages of reasonable structure, convenient manufacture, installation and use, reliable operation, long service life and capacity of forming flywheel pallet castings with high surface finish quality. The method and die require only one time of heating and a die set and can operate once for all, thereby improving production efficiency and forging quality of the castings.

Description

Technical field: [0001] The invention belongs to a metal material plastic forming method and a mold thereof, which are used for the production of forgings of a flywheel tray of an automatic gearbox of a car. Background technique: [0002] The automatic transmission flywheel tray assembly is a key component of a new 2L16 valve engine newly introduced by Shenlong Automobile Co., Ltd. It is composed of a flywheel and a ring gear that are press-fitted and welded as a whole. The flywheel is a large and shallow disk-shaped piece with a diameter of more than 270 mm, a wall thickness of the rim greater than that of the web, and a small transition fillet between the rim and the web. For this kind of disc-shaped parts, if the traditional processing technology is adopted, it will inevitably lead to low material utilization rate, many processing procedures and long cycle time. [0003] In recent years, for the processing of parts with similar shapes to flywheels, in addition to the "Ne...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a warm-drawing deep-upsetting forming process for the flywheel tray of an automatic transmission and its mold, which solves the problem that the existing cold-stamping forming process and its mold can only form small discs with low-strength, good-plastic low-carbon thin steel plates as blanks Process and mold problems that cannot form large-scale disc-like parts with 45 medium carbon thick steel plates with high strength and poor plasticity as blanks

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