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塑料模—精铸—振动紧实负压复合工艺是目前国际上新兴的一种先进铸造工艺,它集中了气化模、熔模精密铸造、负压浇注工艺的特长。该工艺利用熔模精铸的制壳技术,在高密度、高精度的气化模上制壳,一般涂挂3～4层,壳厚3～4mm,在浇注前预先采取适当工艺将气化模脱出,型壳经过高温焙烧后置入砂箱,往型壳周围填充干砂,进行震动紧实,使型壳获得足够的支撑强度,在负压下进行浇注,从而可以避免铸件产生皱皮和增碳缺陷。它适用于各种合金大型、复杂的少余量或无余量精密铸件的生产。该工艺具有较高的经济效益。
Plastic Mold - Casting - Vibration Compaction Negative pressure compounding technology is a newly emerging advanced casting technology in the world. It focuses on the specialty of gasification mold, investment casting, and negative pressure casting technology. The process uses investment casting shell making technology, high-density, high-precision gasification mold on the shell, generally painted hanging 3 to 4 layers, the shell thickness of 3 ~ 4mm, prior to pouring in advance by appropriate technology to gasification Mold prolapse, the shell after calcination at high temperature into the sand box, filled with dry sand around the shell, the vibration tight, the shell to obtain sufficient support strength, under negative pressure for casting, which can prevent the casting wrinkled skin And carbon defects. It is suitable for a variety of large alloy, complex spare or no margin of precision castings. The process has high economic benefits.