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    • 2. 发明授权
    • Investment casting patterns and method
    • 投资模式和方法
    • US06481490B1
    • 2002-11-19
    • US09237435
    • 1999-01-26
    • Joseph M. VihtelicPhilip D. JacksonJiri E. KrestaKurt C. Frisch
    • Joseph M. VihtelicPhilip D. JacksonJiri E. KrestaKurt C. Frisch
    • B22C702
    • B22C7/023B22C9/043
    • Method of making a shell mold for casting molten metals or alloys involves forming a thermally collapsible, low density reaction injection molded (RIM) thermosetting polyurethane foam pattern having a shape corresponding to the casting to be made. The pattern is formulated to have an aggregate density (pattern outer skin and pattern cellular core) in the range of about 10 to 15 lbs/ft3 and a smooth continuous as-molded surface devoid of surface connected open cells, dimensional stability over a range of temperatures, and ready, ashless burnout from the shell mold formed thereon without cracking the shell mold. The pattern is free of organometallic catalysts that should not be present in the casting of aerospace superalloys, such as nickel and cobalt base superalloys and titanium. The pattern then is invested without the need for any surface polymer or other film or layer in a shell mold.
    • 制造用于铸造熔融金属或合金的壳模的方法包括形成具有与要制造的铸件相对应的形状的热可折叠,低密度反应注塑(RIM)热固性聚氨酯泡沫图案。 该图案被配制为具有在约10至15磅/平方英尺范围内的聚集密度(图案外皮和图案细胞芯),以及没有表面连接开孔的光滑连续成型表面,在一定范围内的尺寸稳定性 温度和准备好,从其上形成的壳模的无灰灼烧而不破坏壳模。 该图案没有有机金属催化剂,不应存在于航空航天超级合金(如镍和钴基超级合金和钛)的铸造中。 然后投资的模式不需要在壳模具中的任何表面聚合物或其它膜或层。