Method for forming rear axle whole by rapid extrusion

Abstract

The invention discloses a method for forming a rear axle whole by virtue of rapid extrusion. The method comprises the following steps of: firstly simultaneously heating the two ends of a seamless steel tube blank in an intermediate frequency heating furnace, wherein the heating temperature is gradually reduced from the end part of the blank to the middle part of the blank; then carrying out extrusion forming on the heated tube blank twice to reach required deflection, thus the shape of the end part of the blank and the wall thickness meet requirements of a drawing, a once-heating and twice-extrusion process is realized, the number of times for heating the blank and the forming procedures are reduced, the technological process is simplified, the quality of a forge piece is improved, and the efficiency of a production line is improved. Quantity of production equipment of the production line is reduced, the investment is saved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for metal plastic forming in material processing engineering, in particular to a method for rapid extrusion forming of an integral axle of a rear axle. Background technique [0002] The trailer axle is the main part on the trailer axle, which bears heavy loads and alternating loads. It must have high bending strength, torsional strength and fatigue strength. At present, there are mainly two structural forms of trailer axles, that is, split welded axles and integral axles. The split welded axle consists of an intermediate shaft body and shaft heads at both ends. Generally, the shaft head is forged and then welded to the hollow shaft body. In the early stage of axle production, split welded axles were mainly used. Welded axles have low load-carrying capacity, unreliable product quality, and hidden safety hazards in welded seams. Therefore, the output of this form of spindles is gradually shrinking. The integral main sh...

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Problems solved by technology

[0004] In the rotary extrusion production process, the end of the product is prone to instability during the forming process; the quality of the formed parts after heat treatment is unstable, and the scrap rate is high; the parameters of the rotary extrusion process for products of different specifications need to be explored during production, and the production process is unstable. Product quality cannot be guaranteed, and the production cost is relatively high;

[0005] In the hot extrusion production process, the internal structure and mechanical properties of the metal after forming are superior to the rotary extrusion process, but the existing production process mainly has cumbersome procedures and more heating sequences, which not only reduces the mechanical properties of the workpiece, High energy consumption and serious energy waste in the production process

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