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    • 7. 发明授权
    • Lost foam casting using dimensionally self-stabilized pattern
    • 使用尺寸自稳定图案的失蜡泡沫铸造
    • US06263950B1
    • 2001-07-24
    • US09276857
    • 1999-03-26
    • Marie-Christine G. Jones
    • Marie-Christine G. Jones
    • B22C702
    • B22C7/023B22C9/046Y10S264/09
    • The method of lost foam casting uses a polystirene foam pattern molded from polystirene beads preexpanded from raw polystirene beads that have a raw bead diameter in the range of about 0.1 to about 0.6 millimeters and that include isopentane as a relatively slow diffusing blowing agent alone, or together with normal pentane as a relatively high diffusing blowing agent, the isopentane being present in an amount of at least about 40% by weight of the total blowing agent of the raw beads to significantly reduce post-molding dimensional pattern shrinkage and to render the molded patterns inherently more dimensionally stable. The patterns can be used directly in the lost foam casting of molten metal without the need for any intermediate pattern dimension-stabilizing treatment.
    • 失去泡沫铸造的方法使用由原始多晶珠形成的聚苯乙烯珠粒成型的聚苯乙烯泡沫图案,原始聚合物珠粒的生珠直径在约0.1至约0.6毫米的范围内,并且包括单独的相对缓慢的扩散发泡剂的异戊烷,或 与正戊烷作为相对高的扩散发泡剂一起,异戊烷的存在量为原始珠粒的总发泡剂的至少约40重量%,以显着降低后成型尺寸图案收缩并使成型 图案固有地更加尺寸稳定。 这些图案可以直接用于熔融金属的失去泡沫铸造中,而不需要任何中间图案尺寸稳定处理。