Cold extruding process

Abstract

The invention provides a cold extruding process. Fabrication of center holes at two ends of a shaft is completed through cooperation between an oil hydraulic press and a die, wherein the die is composed of an upper die and a lower die, the upper die is installed on an upper working platform of the oil hydraulic press, the lower die is installed on a lower working platform of the oil hydraulic press, and the upper die and the lower die are respectively provided with a die cavity matching with the shaft; a to-be-fabricated shaft is put in the die cavity of the lower die, then the upper working platform drives the upper die to press downwardly, and the upper die and the lower die cooperate with each other to finish fabrication of center holes at two ends of the shaft. According to the process provided in the invention, fabrication of the center holes at two ends of the shaft is finished through one extrusion, so precision of coaxiality of the two center holes is substantially improved, processing in a subsequent procedure is facilitated, product quality is greatly improved, and raw materials are saved by 19%; meanwhile, frequency of mechanical cutting is reduced, which enables time for subsequent lathe machining to be saved, two-stage fabrication in conventional methods is changed into one formation, and thus, working hours are saved by about 25% as a whole.

Description

technical field [0001] The invention relates to the technical field of auto parts production, in particular to a refrigerant pressure process for manufacturing a shaft in an automotive hydraulic steering pump. Background technique [0002] We know that there is a shaft in the automotive hydraulic steering pump, which is a core part of the hydraulic steering pump. In the machining process of this shaft, the processing of multiple processes must be based on the center holes at both ends of the shaft (one end is a thimble hole, and the other end is a hexagonal hole). In the conventional machining process, due to such two The production of the center hole is completed in two steps, so the coaxiality accuracy of the two center holes is very poor, which causes great difficulties for the processing of the subsequent process and seriously affects the qualified rate of the product. In addition, in the processing of shaft products in conventional machining, the diameter of the raw ma...

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Problems solved by technology

[0003] In order to overcome the two center holes at both ends of the shaft that are completed twice in the prior art, the accumulated error is formed, so the coaxiality accuracy of the two center holes at both ends is very poor, and the technology of mechanical lathe processing is time-consuming and consumable Disadvantages, the present invention provides a new approach, that is, the cold extrusion process, which not only ensures the accuracy of the coaxiality of the two central holes at both ends, but also saves the consumption of raw material round steel, and can also shorten the next mechanical cutting process. process time

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