Manufacturing method of coupler knuckle

Abstract

The invention provides a manufacturing method of a coupler knuckle, which comprises the following steps of blanking, heating for the first time, free forging, heating for the second time, die forging for the first time, trimming for the first time, heating for the third time, die forging for the second time, trimming for the second time, processing, heat treatment and flaw detection, wherein in the step of processing, the pattern draft of a blank making piece is processed; in the step of heat treatment, the quenching and tempering treatment is performed on the blank making piece; in the step of flaw detection, the flaw detection is performed on the surface of the blank making piece; if the qualification is obtained after the flaw detection, the product manufacturing is completed; and if the qualification is not obtained after the flaw detection, the product is moved to a waste area. According to the manufacturing method of the coupler knuckle, the coupler knuckle forging process is determined to be the free forging blank making, two-time die forging and two-time trimming production processes in accordance with the structural features of a forging coupler knuckle. After the coupler knuckle which is produced by adopting the forging process is used, casting defects such as air holes, slag inclusion, shrinkage porosity and the like of the casting coupler knuckle can be completely avoided, the internal quality of the coupler knuckle is guaranteed, and the service life of the coupler knuckle is prolonged.

Description

Technical field [0001] The invention relates to forging technology, in particular to a method for manufacturing a hook tongue, and belongs to the technical field of rail vehicles. Background technique [0002] The knuckle is used to realize the connection between the locomotive and the vehicle or the vehicle and the vehicle and transmit the traction and impact force, and keep a certain distance between the vehicles. In addition to the random and alternating traction, compression and impact forces, the knuckle must also be subjected to bending moments during train operation. Especially in the shunting operation, the knuckle is often subjected to a great impact force. Therefore, the use conditions are very bad, resulting in cracks, deformation, abrasion, and poor three-state functions. Since my country's heavy-duty trucks have generally used the No. 16 coupler, cracks have often occurred in the S-shaped surface of the knuckle. From the statistical survey data of the use of the ho...

AI Technical Summary

Problems solved by technology

[0004] The main failure mode of the cast knuckle is fracture and wear. The friction and abrasive wear of the cast knuckle during use are the main reasons for the wear of the knuckle; Stress concentration caused by impact and friction and wear is the main cause of cracks. The root cause of both lies in the existence of casting defects such as knuckle pores, slag inclusions, and shrinkage cavities. These defects form cracks under the action of alternating stress. , resulting in direct fracture or the formation of fine chips, which in turn accelerates the wear of the knuckle during the operation of the car body, and the quality cannot be effectively guaranteed, which brings great hidden dangers to driving safety.

Images