Hot extrusion forming method of copper alloy rail

Abstract

The invention relates to a hot extrusion forming method of a copper alloy rail. The method includes the following steps that 1, blank processing is performed, specifically, (1) forged polished blank round steel is sawn; (2) the center of the blank is drilled; (3) turning machining and polishing of the outer surface and the head are performed; 2, blank heating is performed, specifically, the heating temperature ranges from 900 DEG C to 950 DEG C; 3, tool and mold preparation is performed, specifically, extrusion molds with the same shapes are adopted; 4, lubrication is performed, specifically,the extrusion molds, manipulators and extrusion cylinders are coated with lubricants; 5, hot extrusion is performed, specifically, hot extrusion forming is performed on the blank; 6, cooling is performed, specifically, the copper alloy rail is cooled to the room temperature; 7, solid solution heat treatment is performed, specifically, the heating temperature ranges from 930 DEG C to 950 DEG C; 8,inspection is performed, specifically, the hardness and the conductivity are inspected; 9, straightening is performed, specifically, the copper alloy rail is straightened; 10, cold drawing is performed, specifically, cold drawing is performed on the copper alloy rail; 11, aging heat treatment is performed; 12, the section hardness, conductivity and room-temperature tensile strength are inspected;and 13, straightening is performed. According to the method, one-time forming of the workpiece is guaranteed through optimization of the mold design and the extrusion forming process, the surface quality of the manufactured copper alloy rail is good, and the physical, chemical and mechanical properties of the product are improved.

Description

technical field [0001] The invention belongs to the technical fields of extrusion molding technology and profiled bar manufacturing, and relates to a hot extrusion molding method for a copper alloy rail. Background technique [0002] Copper alloy track is a special shaped material, which is used in military industry and other fields. Because of its superior wear resistance, high strength, and excellent electrical conductivity, it is a better choice as a special track. The forming method of this kind of solid copper alloy track in China generally adopts the method of forging process forming, and the forging process of the copper alloy track with special-shaped inner hole is difficult to form. [0003] The outer shape and special-shaped inner hole can be formed at one time by hot extrusion. Hot extrusion is to heat the metal material to the hot forging forming temperature for extrusion, that is, to heat the billet to a temperature above the recrystallization temperature of th...

AI Technical Summary

Problems solved by technology

[0004] Since the hot extrusion molding method can be formed at one time, and after cold drawing, heat treatment and other processes, the performance and size requirements are guaranteed, but this forming method also has difficulties. Any problem in the link will lead to the failure of the molding method

Images