Method for manufacturing complex automotive front axle by using combined roll forging and die forging process and welding process

Abstract

The invention provides a method for manufacturing a complex automotive front axle by using the combined roll forging and die forging process and the welding process, which belongs to the technical field of automotive front axle manufacture. The invention mainly solves the problem that the front axle of a low-entrance bus can not be manufactured by the existing equipment and process. The method is mainly characterized in that the method comprises the following steps: (1) selecting low-carbon alloy round steel, and feeding the low-carbon alloy round steel according to the size of a part A and a part B; (2) processing the part A and the part B by use of a part A die and a part B die and the combined process of roll forging and die forging, and processing the interface position into an X-shaped groove; and (3) locating two pieces of the forged part B and one piece of the forged part A by a fixture, and processing the X-shaped groove by multilayer multi-pass welding to obtain the front axle. The method adopting the combined process of forging and welding can ensure the product quality, and has the advantages of less investment on equipment and dies, high material utilization rate, long service life of the dies, less pollution, low energy consumption, and the like. In addition, the method is suitable for large-batch production, and is mainly used for manufacturing large and complex automotive front axles.

Description

A method of manufacturing complex automotive front axles using roll forging die forging and welding processes technical field The invention belongs to the technical field of automobile front axle manufacturing. Specifically, it relates to a manufacturing method for producing a large and complex front axle of a low-entrance passenger car by adopting roll forging, die forging and welding jointing techniques. Background technique With the development of modern industry and the improvement of people's living standards, in order to meet people's higher and higher requirements for travel convenience and comfort, GAC Research Institute and our company have cooperated to develop 8-meter low-entrance buses to fill the gap between domestic and foreign medium-sized low-entrance buses. The technology of the bus is blank, and the advantages of the bus are as follows: 1. The suspension elastic elements are arranged above the wheels, which can realize an ultra-wide passage of 1 meter (th...

AI Technical Summary

Problems solved by technology

The most critical part of the above-mentioned low entrance bus models is the front axle of the low entrance bus. Because the two spring seats are placed on the two wheels of the low entrance bus, the shape and structure are complex. The front axle is 2280mm long, 887mm high, and the horizontal projected area is about 4800 For large and complex forgings of square centimeters, the current production of the large and complex low-entrance passenger car front axle requires a large-table forging die forging equipment with an overall forging force of more than 30,000 tons and a forging production line with multiple large-table and large-tonnage billet-making equipment. The production of the front axle requires a lot of equipment and a large investment, the billet making process is complicated, and it can be completed in multiple fires, and the material utilization of forgings is low. At present, there is no domestic manufacturer that can produce the front axle.

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