Back-pressure thixotropic extrusion forming method and device for shaft sleeve parts

Abstract

The present invention discloses a back-pressure thixotropic extrusion forming method and device for a sleeve part, which belongs to the field of semi-solid forming technology. The present invention first reheats the semi-solid blank to a semi-solid temperature range, keeps it warm for a period of time, obtains a semi-solid slurry, and then transfers it to the mold cavity. By controlling the hydraulic press and the hydraulic cylinder connected to the upper and lower back-pressure rings, the semi-solid slurry obtains the follow-up back pressure provided by the upper and lower back-pressure rings during the extrusion process, and when the mold is closed, the upper and lower back-pressure rings give the sleeve part back pressure and then eject it to obtain a semi-solid extruded sleeve part. The method of the present invention adopts a semi-solid forming process and a hydraulic control system to prepare the sleeve part. Its advantages are that the process flow is short, near-net forming can be achieved, and the production cost is low. The prepared sleeve part has a dense structure, uniform solid-liquid phase distribution, and good mechanical properties.

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