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航空发动机上涡轮的零件由难于机械加工的耐热合金制成,零件的尺寸要求精确且形状复杂,例如图1所示为涡轮转子叶片。要制造内腔带有冷却孔道的,形状复杂的叶片零件,通常采用无余量熔模精密铸造的方法。一、对无余量精铸件的精度要求无余量精密铸造并非不留一点加工余量,只是将余量控制在允许范围内,表1列举了斯贝发动机的几个典型精铸件的尺寸公差。二、无余量精铸工艺精铸件主要工作表面由加工到不加工,必
Turbine parts on aero engines are made of hard-to-machine, heat-resistant alloys that require precise parts and complex shapes. For example, Figure 1 shows a turbine rotor blade. To create a cavity with cooling channels, the shape of the complex parts of the blade, usually without margin casting precision casting method. First, the marginless precision casting precision requirements No margin Precision casting is not without leaving a margin, only the margin control within the allowable range, Table 1 lists the Spy engine several typical precision castings dimensional tolerances. Second, no margin casting process Casting the main work surface from processing to non-processing, will