A device and process for hot extrusion forming of a steel diesel engine piston

Abstract

The invention provides a hot extrusion forming device and process for a steel diesel engine piston. The device includes a multi-directional forming extrusion device for extruding a metal blank to form a forging blank and a punching hole for punching the forging blank. The invention can realize the flashless forging forming of the steel diesel engine piston, and can form the piston pin hole, the process and the device can keep most of the metal streamlines of the forgings, and the metal streamlines are distributed along the contour of the forgings. It is beneficial to the stress state of the part during use, and at the same time, the required forming process of the process and the device is short, the energy consumption of the forming equipment is low, and the metal utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of metal hot precision forging, in particular to a hot extrusion forming device and process for a steel diesel engine piston. Background technique [0002] The working environment of the piston in the oil production machine is very harsh, and it needs to withstand periodic mechanical loads such as high-pressure gas burst pressure, inertial force generated by high-speed reciprocating motion, lateral pressure and friction force. The temperature of the piston increases, and the temperature distribution is very uneven, resulting in a large thermal deformation and thermal stress of the piston, and in severe cases, cylinder pulling and locking will occur. At present, aluminum pistons have broad application prospects, but steel pistons must be used for diesel engines with combustion pressure exceeding 22Mpa and liter power greater than 100KW. Some data show that the power of diesel engines using steel pistons can b...

AI Technical Summary

Problems solved by technology

[0003] At present, the production of steel pistons generally adopts the open die forging process, which needs to go through preform, final forging, edge trimming and other processes. Due to problems such as flashing and large draft angle of forgings, it is easy to cause low metal utilization rate and equipment capacity. The consumption is high, and the piston pin hole cannot be forged, which increases the man-hours of subsequent machining, which is not conducive to cost reduction

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