SEMI-SOLID METAL FORMING METHOD

摘要

A semi-solid metal forming method comprising the steps of providing a thixotropic metal slug corresponding to the weight of metal to be used, heating slug to a semi-solid state until the liquid fraction gives the desired forming viscosity, transferring the slug to a pressure die-casting or forging press, and forming the slug by pressure die-casting or forging. According to the method, the viscosity of the slug is adjusted to the desired value by correspondingly adjusting the heating power by a quantity related to the resistance of the material to the forging punch or the plunger during the process of filling the forging die or the mould cavity. Said method is particularly suitable for forming thixotropic aluminium alloys.