Thermal extrusion forming device and process for steel diesel engine piston

Abstract

The invention provides a thermal extrusion forming device and process for a steel diesel engine piston. The device comprises a multi-direction forming extrusion device for extruding a metal blank to form a forge piece blank and a punching device for punching the forge piece blank. The device and process can achieve flash-free forge forming of the steel diesel engine piston and a piston pin hole can be formed. According to the process and device, most metal flow lines of the formed forge piece are reserved and are distributed along a contour of the forge piece, so that a stress state of a partin a using process is facilitated, and meanwhile, as the process and device need a short forming step, the forming equipment is relatively low in energy consumption and relatively high in utilizationratio of metals.

Description

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

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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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