Vacuum reverse expansion sintering mold method

The invention discloses a vacuum reverse expansion sintering mold method which comprises the following specific steps: S1, a preparation stage: an operator prepares materials to be sintered in proportion in advance, and uniformly mixes and stirs the materials; s2, a preliminary shaping stage, wherein a worker preliminarily shapes the prepared materials in a machine or manual mode; by adopting a vacuum reverse expansion sintering mode, it can be guaranteed that the overall chemical property change of the material is relatively slow in the sintering process, meanwhile, the product is protected by injecting the protective gas in the vacuum state, the product is subjected to low-temperature and high-temperature impact treatment, the overall product is very prone to severe shrinkage after surface expansion, and the product quality is improved. According to the mold, oxygen and other materials contained in holes in the surface of a product can be rapidly extruded out, the whole surface is smooth in area and more st