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1. 发明授权

US4612968A Method of casting using expendable patterns 失效
标题翻译：使用消耗型图案进行铸造的方法
公开(公告)号：US4612968A
公开(公告)日：1986-09-23
申请号：US763759
申请日：1985-08-07
申请人： Michael C. Ashton , Derek A. Bish , Stephen G. Sharman
发明人： Michael C. Ashton , Derek A. Bish , Stephen G. Sharman
IPC分类号： B22C9/04 , B22C15/10 , B22C15/22
CPC分类号： B22C9/046
摘要： A method of casting a metal article in a mould box comprises locating an expendable pattern in the box, the pattern having a gas permeable refractory coating thereon, placing and compacting unbonded particulate material about the pattern and supplying molten metal into the box so as to vaporize or burn away the pattern and form the article of defined shaped while applying a vacuum during casting. According to this invention, the method is improved by compacting the particulate material to a maximum bulk density where it contacts the coated pattern and applying a vacuum to the compacted particulate material so as to create sufficient pressure gradient in the height of the compacted material to maintain the integrity of the gas permeable refractory coating. In this way, the risk of mould collapse, metal breakout, and pollution are reduced.
摘要翻译：在模具箱中铸造金属制品的方法包括将一次性图案放置在盒子中，该图案在其上具有气体可渗透的耐火涂层，在该图案周围放置和压实未粘合的颗粒材料并将熔融金属供应到箱中以便蒸发或者在铸造过程中施加真空时烧掉图案并形成限定成形的制品。根据本发明，通过将颗粒材料压实至最大堆积密度，其中其与涂覆图案接触并向压实的颗粒材料施加真空，从而在压实材料的高度上产生足够的压力梯度以维持透气性耐火涂层的完整性。这样就可以减少模具倒塌，金属破裂和污染的风险。

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