Alloyed steel horizontal type indirect extrusion machine

Abstract

The invention discloses a horizontal reverse alloy steel extrusion machine, which belongs to the novel technical field of seamless steel pipe and relates to a seamless steel pipe manufacturing facility. The purpose is to settle the problems of complex process, inefficiency, high energy consumption and pollution of the environment with the prior domestic cold drawing techniques of small-bore seamless alloy steel tube. The machine consists of a rigid framework, a liquid-filled combined hydraulic cylinder and a die assembly, wherein, the rigid framework consists of an anterior fixed beam, a posterior fixed beam and an intermediate moving beam on the frame, which are connected in series by a four tensile columns; the liquid-filled combined hydraulic cylinder has a compact structure and is capable of executing the operations of die displacement, material feeding, perforation, extrusion and die removal; the die assembly consists of a perforation and extrusion and automatic switching system, a hot extrusion / molding system and a die removal and disengaging and residual extrusion and cutting system. The machine is capable of achieving once-and-for-all heating and once-and-for-all molding to directly produce finished products of small-bore seamless alloy steel pipes. Compared with forward extrusion, the deviations of the displacement of the piercing mandril and the dies are small, and no friction occurs between the billets and the internal wall of the container, thereby the machine can directly adopt continuous casting billets to extrude small-bore pipes, and has the advantages of simple process, high quality, high efficiency, low energy consumption, etc.

Description

technical field [0001] The invention relates to the technical field of metal pressure processing in the metallurgical industry, in particular to an alloy steel horizontal reverse extrusion machine. Background technique [0002] my country is the world's largest producer of steel, and the output of seamless pipes ranks first. However, high-quality seamless pipes still rely on imports. The production technology of small-diameter alloy steel seamless pipes in China has long followed the process of cross-rolling perforation plus cold drawing or cold rolling into finished products. Due to the cross-rolling and piercing of the billet, the wall thickness of the capillary is uneven, and the surface and internal quality are low. The capillary needs to be pickled and saponified before drawing; there are many drawing passes and repeated annealing to eliminate work hardening, which makes the process complicated and inefficient. Low energy consumption, high energy consumption, and envir...

AI Technical Summary

Problems solved by technology

Since the metal flow direction is consistent with the movement direction of the extrusion shaft during the forward extrusion process, there is severe friction between the surface of the billet and the inner wall of the extrusion cylinder, resulting in a loss of 30 to 40% of the extrusion force; the temperature generated by the friction makes the billet Uneven temperature leads to uneven metal flow. In order to avoid defects such as cracks and wrinkles in the product, the extrusion speed must be reduced, resulting in a decrease in production efficiency.

Therefore, there are following defects and deficiencies: (1) high energy consumption; (2) short service life of the die extrusion cylinder; (3) low production efficiency; (4) thicker extrusion residue, greater metal loss

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