A cold extrusion process of high-speed rail electrical connector pins

Abstract

The invention discloses a cold extruding process of a high-speed rail electrical connector pin, for solving the problem that the tensile strength of a conventional high-speed rail electrical connector pin cannot satisfy the tensile strength needed for high-speed driving of a high-speed train. The major technical points of the cold extruding process of the high-speed rail electrical connector pin are as follows: placing an intercepted TP1-Y phosphor deoxidized copper blank material in a vacuum heat treatment furnace for annealing processing, heating to a temperature of 700 to 800 DEG C, and performing thermal insulation for two to three hours; performing brush application of a water-soluble lubricant on the surface of the TP1-Y phosphor deoxidized copper blank material; after the TP1-Y phosphor deoxidized copper blank material is paced in a mold jacket for sealing, performing cold extruding for the first time by use of a hydraulic press; reversely performing cold extruding processing for the second time on the TP1-Y phosphor deoxidized copper blank material after the cold extruding of the first time; and heating a TP1-Y phosphor deoxidized copper workpiece to a temperature of 400 to 500 DEG C, performing thermal insulation for two to four hours, and then stopping the heating for air cooling. The cold extruding process of the high-speed rail electrical connector pin has the following advantages: the tensile strength after processing of a cold extruding technical mode is 300 to 400 MPa, the strength is increased by 30 to 40%, and the driving need of the high-speed train in a severe environment can be effectively met.

Description

technical field [0001] The invention relates to the technical field of cold forging, in particular to a cold extrusion process of a high-speed rail connector pin. Background technique [0002] In recent years, when Chinese leaders visit abroad, they will vigorously promote China's high-speed rail technology. High-speed rail has become a business card of China. In fact, China's high-speed rail is indeed something to be proud of. Many foreign technologies have been transformed and absorbed by China, and connectors, which are important components, have been monopolized by foreign companies. [0003] At present, with the rapid development of China's high-speed rail, the requirements for high-speed rail connector pins are also constantly improving. The traditional high-speed rail connector pins are processed directly by using CNC lathes. The selected materials It is red copper, but this kind of material has poor electrical conductivity and poor shape, and the red copper is pron...

AI Technical Summary

Problems solved by technology

[0003] At present, with the rapid development of China's high-speed rail, the requirements for high-speed rail connector pins are also constantly improving. The traditional high-speed rail connector pins are processed directly by using CNC lathes. The selected materials It is red copper, but this kind of material has poor electrical conductivity and poor shape, and the red copper is prone to hydrogen disease during the heating process, which will cause the parts to break during the processing and affect the high-speed rail connector pins. overall strength

[0004] Therefore, in order to improve the electrical conductivity of high-speed rail connectors and prevent the occurrence of hydrogen disease, many manufacturers will choose to use copper mixed with silver in the production process to process it into TP1-Y phosphorus deoxidized copper, and then use it as raw material. CNC lathes are used to directly process the high-speed rail connector pins. However, although the high-speed rail connector pins formed by this method have enhanced electrical conductivity and can prevent the occurrence of hydrogen disease, but because the silver material is soft and the entire body The processing process did not improve the internal structure of the high-speed rail connector pin, resulting in low tensile strength. After many experiments, it was shown that the tensile strength of the parts obtained by direct processing of bars was 270mpa, while the high-speed rail During high-speed driving, a strong pulling force will be generated on the pins of the high-speed rail connector. During long-term operation, if the tensile strength of the high-speed rail connector is not enough, the pins of the high-speed rail connector will not be able to maintain good connection stability. Therefore, it is difficult to meet the tensile strength requirements of high-speed rail during high-speed driving by using traditional processing techniques.