Precise extruding and forming method for long barrel-shaped component with base

Abstract

The invention discloses a precise extruding and forming method for a long barrel-shaped component with a base. The precise extruding and forming method comprises the following steps: firstly heating round steel or square steel, which is cut by a saw, in a medium-frequency induction heating furnace, raising the temperature to an initial forging temperature of a material, and removing an oxide skin; then putting the heated square material of which the oxide skin is removed into a concave model cavity for performing extruding and forming, and descending a sliding block of a hydraulic machine so as to complete the operation procedures of the extruding and the forming; entering an extruded and formed blank material into a reverse extrusion forming station, so that the reverse extrusion forming is realized through the quick pressing of the hydraulic machine; pressing the blank material extruded reversely by a press machine, and forming a forward extrusion blank material so as to complete the forming of the long barrel-shaped component with the base in the length direction; putting the formed blank material into a drawing mold so as to form the required barrel-shaped size. According to the precise extruding and forming method, the deformation is greatly reduced, the uniformity of the wall thickness of a forging is improved, the life of a punch is prolonged, and the equipment investment is reduced.

Description

technical field [0001] The invention relates to a metal plastic forming technology in material processing engineering, in particular to a method for precision extrusion forming of a long cylindrical part with a bottom. Background technique [0002] Long cylindrical parts with bottom are a kind of products with large quantity and wide range, which are widely used in military and civilian fields. Typical products are such as projectile blanks and gas cylinders. The existing forming process of such long cylindrical products is mainly There are two types, one forming process is through multi-pass back extrusion forming, and the other forming process is through pressing, back extrusion (punching) and drawing forming. When these two processes are forming cylindrical parts with a bottom with a long length (≥400mm), both of them have a large difference in product wall thickness. The low utilization rate is a technical problem that is difficult to solve in the field of hot extrusion...

AI Technical Summary

Problems solved by technology

When these two processes are forming cylindrical parts with a bottom with a long length (≥400mm), both of them have a large difference in product wall thickness. The low utilization rate is a technical problem that is difficult to solve in the field of hot extrusion forming of such products. The reason for this problem lies in the back extrusion process of the two processes. During the process, the punch directly squeezes the workpiece, which bears a lot of pressure. Under the pressure of the slender rod, it is easily deformed and unstable. The extrusion punch is easy to bend, which causes uneven wall thickness of the workpiece.

In addition, the life of the punch is low during the reverse extrusion process, resulting in a high scrap rate, frequent mold replacement, and a decrease in production efficiency

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