Backward extrusion process of long cylindrical bushing by using non-standard low-speed press

Abstract

The invention discloses a backward extrusion process of a long cylindrical bushing by using a non-standard low-speed press. The process comprises the following steps of: (a) blanking and heating; (b) profiling; (c) carrying out shallow punching; and (d) carrying out backward extrusion, wherein the press used in a step (b) to a step (d) is the non-standard low-speed press, and the work speed is not greater than 40mm / s; the diameter of a chamber of a profiling die in the step (b) is phi b, the diameter of a chamber of a shallow punching die in a step (c) is phi c, the diameter of a chamber of a backward extrusion die in the step (d) is phi d, and phi b is equal to phi c is equal to phi d; the diameter of a shallow punch in the step (c) is phi 1, the diameter of a backward extrusion punch in the step (d) is phi 2, and phi 1 is equal to phi 2; the shallow punching depth in the step (c) is Lc, the backward extrusion depth in the step (d) is Ld, and Lc is smaller than or equal to Ld / 2. The process has the characteristics of stable product quality, low tool, raw material and kinetic energy consumption and the like.

Description

technical field [0001] The invention relates to the technical field of elongated sleeve forming technology, in particular to the reverse extrusion molding process of elongated sleeve. Background technique [0002] Generally, the hot extrusion process used for cylindrical sleeves (including other types of cylindrical parts) is: heating (bar material)→pressing (preforming)→deep drawing→drawing, and the inner diameter of the workpiece remains unchanged during the drawing process. , The outer diameter gradually decreases, such hot extrusion is called drawing. The national standard press used is fast, the working speed is generally 80mm / s~100mm / s, and the power source is usually above 1000kw. There are the following problems: (1) The cost of the press is high, and because the press runs at a high speed, it requires more power sources, so the cost of kinetic energy is high; (2) Due to the large margin of the workpiece shape and unstable product quality, the corresponding It also...

AI Technical Summary

Problems solved by technology

There are the following problems: (1) The cost of the press is high, and because the press runs at a high speed, it requires more power sources, so the cost of kinetic energy is high; (2) Due to the large margin of the workpiece shape and unstable product quality, the corresponding (3) In the process of deep drawing and drawing, due to the large consumption of tooling such as punches, the cost of tooling is also increased, etc.

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