我厂曾为某单位压铸一种铝合金件毛坯 ,零件上有三个相同的锥形孔 ,孔的尺寸精度和位置精度较高 ,而且零件图上没有对孔提出加工要求 ,这就使加工锥形型芯工序显得格外重要了。锥形型芯如图 1所示 ,在加工该型芯锥面的过程中 ,须满足 7.2 9- 0 .0 1,1° ,34 9- 0 .0 3三个尺寸 I plant for a unit of aluminum die casting a blank, there are three parts on the same tapered hole, the hole size of the high precision and location accuracy, and parts on the hole did not make the processing requirements, which makes the processing cone Form core process is particularly important. Conical core shown in Figure 1, in the process of processing the mandrel conical surface, to meet the 7.2 9-0.1 0,1 °, 34 9-0 0 .0 3 three dimensions