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一、拉削余量拉削余量的大小直接会影响拉刀的长度,如加工孔径Φ30mm,长度30mm多的工件,拉削余量一般取1mm,但见到西德、日本的拉刀,如上述相似尺寸的工件的拉削余量只有0.3mm,它还不到我厂采用余量的1/3。余量差别大的原因是多方面的,但拉孔前的加工工艺落后是个重要因素,如我厂对孔径Φ50mm以下的工件用钻削加工,由于钻出孔的表面粗糙度只有Ra25～12.5μm,且时有较深的划沟,尺寸公差只达H13。另外,工件拉前孔和基准面垂直度误差大,拉
A broaching allowance Broaching allowance size will directly affect the length of the broach, such as processing aperture Φ30mm, length 30mm and more artifacts, broaching margin generally take 1mm, but to see West Germany, Japan’s broach, As the above-mentioned similar size workpiece broaching allowance is only 0.3mm, it is less than I use the remaining 1/3. The reasons for the large margin difference are many, but the lagging before the lapping process is an important factor, such as my factory on the workpiece diameter of Φ50mm with the drilling, the surface roughness due to drilling holes only Ra25 ~ 12.5μm , And when there is a deeper trench, the size tolerance of only H13. In addition, the workpiece before the hole and the reference plane perpendicularity error, pull