为了镗QY25型汽车起重机基本臂(见图1)上的孔系,我们设计了如图2所示的镗模,使用钻床(ZQ3080)加工。经使用验证,所加工产品完全满足了图纸要求,花钱不多却解决了问题。经工艺分析知:除各孔系的孔间距要保证外,还要求3组孔均要垂直于基准面C,且尺寸130 mm、300 mm的对称面皆要与基准面C重合。1.模座以图2中件9(双孔镗模座)为例,先确定镗模开口处的尺寸 In order to bore the hole system on the basic arm of the QY25 truck crane (see Figure 1), we designed a boring die as shown in Figure 2 and machined it using a drill press (ZQ3080). The use of verified, the processed products fully meet the drawings requirements, spend less but solve the problem. The process analysis shows that: In addition to the hole spacing of the holes to be guaranteed, but also requires three holes are perpendicular to the reference plane C, and the size of 130 mm, 300 mm of the symmetry plane are to coincide with the reference plane C. 1. Mold base to Figure 9, the pieces 9 (double hole boring mold base), for example, first determine the size of the mold opening