基于标准球在铸件基准传递上的方法研究

Method Based on Standard Ball Transfer in Casting Benchmark

通过标准球,实现三坐标测量和非接触式光学扫描测量数据的传递和验证,确定铸件基准。将标准球与铸件在同一坐标系中,使用非接触式光学扫描测量机进行扫描,根据产品三维模型进行拟合计算,得到理想的铸件尺寸状态,使标准球带有铸件坐标信息。根据标准球建立加工坐标系,通过基准目标的尺寸验证数据偏差是否满足加工要求,将理想的铸件尺寸状态传递给数控加工中心。结果表明,加工后,通过三坐标测量基准目标偏差,可以判定基准传递和加工结果是否符合要求。该方法可实现基准在铸件与零件加工过程准确、高效的传递。

The CMM and non-contact optical scanning measurement data were transmitted and verified by using the standard ball,and the casting reference was determined.The standard ball and the casting were in the same coordinate system,and the non-contact optical scanning measuring machine was used for scanning.According to the 3 D model of the product,fitting calculation was carried out to obtain the ideal casting size state,so that the standard ball had the casting coordinate information.The machining coordinate system was established according to the standard ball,and the data deviation was verified to meet the machining requirements through the size of the reference target.The ideal casting size state was transferred to the CNC machining center.The results show that the target deviation of CMM benchmark can be used to determine whether the benchmark transfer and the machining results meet the requirements.The method can realize accurate and efficient transfer of datum in casting and parts processing.