图1所示零件,直接由熔模铸造铸出A、B两加工基准面,这两平面的平面度误差对零件的加工精度影响很大。 原模具A、B两平面由中模(一)、 (二)、(三)三块拼合而成,由于模具的加工装配定位误差,平面度误差很大,致使铸件不能直接用该平面作为加工基准面。为减少机加工工作量,直接铸出A、B两加工 The parts shown in Fig. 1 directly cast A and B machining datums from investment casting, and the flatness error of these two planes has a great influence on the machining accuracy of the parts. The original mold A, B two planes from the mold (a), (b), (c) three pieces together, due to the mold assembly process positioning error, flatness error is large, resulting in casting can not be used directly as the plane Datum To reduce the workload of machining, direct casting A, B two processing