Processing method of positioning hook forge piece

Abstract

The invention discloses a processing method of a positioning hook forge piece. The processing method of the positioning hook forge piece comprises the following steps: 1), selectively using 35mm round steel and cutting by using a shearing machine, wherein the length of a sheared rough blank piece is 172mm; 2) putting the rough blank piece obtained in the step 1 into an intermediate frequency heating furnace for heating at a heating temperature of 1120 to 1180 DEG C and keeping the heating for 2-3min; 3) drawing out two ends of the workpiece obtained in the step 2 by utilizing an air hammer till the arrival of 20+/-2mm diameter, wherein the hammer drawing is performed for 8-14 times; 4) putting the drawn-out workpiece into a bending die of a punching machine for bending; 5), putting the bent workpiece into a shaping die in an electric screw press for hot forging by using the shaping die, wherein the temperature is 900 DEG C and the pressure is 630T; and 6) putting the hot forged workpiece into the punching machine for side cutting and punching. With the adoption of a quenching and tempering heat treatment technology for a positioning hook provided by the invention, the high temperature normalizing and the forging are caused to organically form a continuous production line; and therefore, the defects of the prior art are overcome, the energy resource is saved, the heat treatment quality is improved, the production period is shortened, the production cost is lowered and the radiation pollution to a workshop environment is reduced.

Description

technical field [0001] The invention relates to the processing field of positioning hooks, in particular to a processing method of positioning hook forgings. Background technique [0002] The positioning hook for trains is an important accessory of railway wagons. It is mainly the main part of the upper and lower connection structure between the tank body and the bottom frame. At the same time, it prevents the tank from moving laterally during operation, so the positioning hook itself for railway wagons Has high quality requirements. The manufacturing method of the existing positioning hook for railway freight cars is the method of casting molding, and what the positioning hook casting adopted is sand casting, i.e. water glass sand carbon dioxide hardening process. [0003] It has the following main disadvantages: [0004] The surface is poorly formed, the appearance quality is poor, and there are many defects such as pores, shrinkage cavities, and shrinkage porosity. The ...

AI Technical Summary

Problems solved by technology

[0004] The surface is poorly formed, the appearance quality is poor, and there are many defects such as pores, shrinkage cavities, and shrinkage porosity. The reason for these defects is the structure of the casting itself. Defects such as shrinkage cavity and shrinkage porosity make the internal structure of the molded parts loose, and internal defects are not easy to find, which seriously affects the quality of the molded parts and has potential hazards; in addition, the molding process of the pressing plate requires the core to be formed, the mold or the core Pore ​​defects are prone to occur if it is not completely dry. During the molding process, if the cleaning is not clean, it is easy to produce casting defects such as sand inclusions and sand loss, which will affect the appearance quality of castings.