Inner necking mouth machining mould and machining method for workpiece

Abstract

The invention provides an inner necking mouth machining mould and a machining method for a workpiece. The inner necking mouth machining method for the workpiece comprises the following steps: fixing the workpiece to a clamp; performing electric heating on a machining end of the workpiece; rotating the workpiece when the machining end of the workpiece is heated so that the workpiece is in contact with the inner necking mouth machining mould and moves relative to the inner necking mouth machining mould to generate frictional heating; extruding and flanging the machining end inwards; and simultaneously, shaping the machining end, wherein the inner necking mouth machining mould is a hard material, meanwhile, the rotating linear velocity of the workpiece is 2 to 15 m/s, and the extruding pressure is 5 to 150 kg/m<2>. When the workpiece is machined by the method, the friction heat can be generated optimally by matching the speed and the pressure, so that the energy consumption can be effectively reduced; the machining efficiency and quality of the workpiece can be effectively improved; the twisting and bending of the workpiece are effectively avoided during machining; the inner necking mouth of the workpiece is integrated; the end part of the workpiece is thickened; the influence on the airtightness and the safety caused by the appearance of the falling off or cracking of the end part of the workpiece is effectively avoided; the application range of the workpiece is expanded; and production can be performed aiming at different workpieces.

Description

technical field [0001] The invention relates to the technical field of necking processing, in particular to a mold for processing inner necking of a workpiece and a processing method thereof. Background technique [0002] The mechanical seal is a shaft sealing device for a rotating machine. Such as centrifugal pumps, centrifuges, reactors and compressors and other equipment. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a A shaft seal device that prevents leakage. The pressure vessel head is an important component of the mechanical seal of the water pump during production. The pressure vessel head often needs to be shrinked by a shrinking machine during production so that it can be more tig...

AI Technical Summary

Problems solved by technology

[0006] During the processing of this method, it is difficult to control the heating temperature, rotation speed and rotational extrusion force of the workpiece. When the heating temperature is too high, the workpiece is prone to twisting and bending, the energy loss is too high, and the temperature is too low or too high to affect the inversion of the workpiece. Edge effects, processing efficiency and processing quality

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