Precision forging process for twisting connector part of automotive chassis suspension system

Abstract

The invention relates to precision forging process for a twisting connector part of an automotive chassis suspension system. The process comprises the steps of selecting bars, determining feeding size of an original blank according to weight and process of a forging part; preheating the bars in an electric furnace and preheating an extrusion die; taking the bars out of the furnace and extruding the bars to form a blank on an extruding machine; placing a formed rough blank into the electric furnace for heating insulation; sequentially performing first die forging forming on a friction press; cooling the pre-forged blank with air after the first die forging, then sawing off flash, and repairing damage; placing the pre-forged blank into the electric furnace for heating insulation and preheating a forging die; performing second die forging forming and removing the flash; and performing shape correcting, quenching aging and shot blasting. According to the precision forging process for the twisting connector part of the automotive chassis suspension system, the blank of the complex part is formed by utilizing one die, four convex round corners at the bottom of the part difficult to form meet the requirement for precise size, a streamline is distributed along the shape of the part, inner tissues are evenly distributed, and grain size is even and small. Compared with a cast product, product mechanical property is obviously reinforced.

Description

technical field [0001] The invention relates to a torsion joint part of an automobile chassis suspension system, in particular to a precision forging process for the torsion joint part of an automobile chassis suspension system. Background technique [0002] At present, the key stress-bearing parts of some high-performance automobile chassis suspension systems (such as: the torsion joint parts of the automobile chassis suspension system) have an important impact on the stability, reliability, and ride comfort of the vehicle, so it is required The internal organizational performance is very high, and the flow lines are distributed along the geometric shape of the part, which can withstand the requirements of working in a complex environment. [0003] see figure 1 , which is a schematic diagram of the structure of the torsion joint parts of the automobile chassis suspension system. The material of the parts is aluminum alloy material LY11. As shown in the figure: the base of...

AI Technical Summary

Problems solved by technology

Due to the high dimensional accuracy requirements of the four protruding rounded corners of the base of the part, the outer surface of the rounded corners of the base requires forging the original surface, that is, no machining will be performed after forging. Since the rounded corners of the part base are thinner and located in the deep cavity of the mold, During forging, at the deep and narrow fillet part of the die cavity, the frictional resistance, the vertical component force caused by the die wall and the cooling of the metal here are faster, the deformation resistance is large, and the plasticity of the metal at the four fillet parts of the base of the part is deteriorated, resulting in the parts The four rounded corners of the base produce dissatisfaction

If the forging is repeated at one time, the metal at the rounded corner of the base will cool quickly, the plastic flow will become poor, and the metal will be difficult to transfer and distribute. a lot of waste

If the temperature is low, the plasticity is not good, it is difficult to fill, the dimensional accuracy of the fillet cannot be guaranteed, and the deformation resistance is large, it is easy to forge and crack, resulting in the scrapping of the billet

High temperature has good plasticity, but if the temperature is too high, over-burning structure will easily appear, resulting in coarse grains and reduced mechanical properties of parts

Therefore, it is difficult to form such parts by ordinary forging methods.

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