Forging and pressing method of steel rail heel and three-position molding die used thereby

Abstract

The first purpose of the invention is to provide a forging and pressing method of steel rail heel; a steel rail heel comprises a pre-forging heel and a final forging heel; the pre-forging heel comprises a first section, a second section, and a third section; the final forging heel comprises a fourth section and a fifth section; the method specifically comprises the following steps: implementing a first stage forging and pressing after heating the first section, the second section and the third section, wherein the first two sections are molded by forging and pressing, the third section is pre-deformed; and implementing a second stage forging and pressing after heating the last three sections. The provided forging and pressing method adopts a measure of molding twice, thereby being able to solve the defect that the size of the molded final forging heel is unqualified, as well as greatly reducing the molding force in the entire steel rail heel product molding process. The second purpose of the invention is to provide a three-position molding die with a simple integral structure; a second upper die section inside a pre-forging rail molding cavity and a first pre-forging insert inside a final forging molding cavity are both in detachable structures, thereby meeting different requirements to the three-position molding die in the twice forging and pressing process; the three-position molding die is convenient to be assembled, and strong in practicability.

Description

technical field [0001] The invention relates to the field of railway switch point rails, in particular to a forging method for the heel end of a rail and a three-station forming die adopted therefor. Background technique [0002] Domestic high-speed, speed-up and most normal-speed railway turnout point rails are made of asymmetric cross-section rails, and the connection with the standard rail of the railway line requires the connecting section to be processed into a standard rail shape, thus producing asymmetric cross-section rail hot die forging point rails. Finally, the asymmetric section rail is forged into a 150mm long transition section and a 450mm long standard section rail. [0003] Seamless track is an important new technology in today's track structure. The heel of the switch rail of the seamless line is connected to the guide rail by welding. Due to the limitation of the current technological level in the design, the welding position of the heel of the switch rail...

AI Technical Summary

Problems solved by technology

[0004] The equipment capacity of domestic turnout manufacturers is configured according to the forging and forming of the length of the existing rail heel forming section. The maximum tonnage of the existing rail heel forging and forming press is about 5000t. After the forming section is lengthened, if the whole is formed at one time, the mold cavity is vertical If it is not closed, there must be a material head at the end of the rail after forming. If the length of the forming section reaches 1050mm, the mold cavity must be greater than 1050mm and include the length of the material head. If the length of the mold is too long, the length of the formed rail is too long, and the deformed metal Large quantity, sharp increase in metal deformation resistance, insufficient tonnage of equipment

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