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三十七、孔的加工方法有哪几种加工孔的常用方法是根据工件种类、孔的大小和加工精度来决定的。对实体钢件上加工Φ35以下的孔,可在钻床上一次钻出。其光洁度一般为▽3～4,精度达5～6级;大于Φ35的孔,要先钻一小孔再扩钻到尺寸。扩孔的光洁度达▽4～5,精度可提高到4～5级。钻孔范围一般为O.25～80毫米。对已铸或锻出毛坯孔者,采用扩孔,其光洁度为▽5～6,精度为4级,扩孔范围在10～100毫米。对于较大的孔则在镗床或车床上镗孔,一般镗孔可达▽4和4级以上精度,精镗可达▽9～10和
Thirty-seven, the hole processing methods There are several kinds of processing holes commonly used method is based on the type of workpiece, hole size and processing accuracy to decide. On the physical steel processing Φ35 below the hole can be drilled once in the drilling. The finish is generally ▽ 3 ~ 4, accuracy of 5 to 6; greater than Φ35 hole, you must first drill a hole and then drill to the size. Reaming the finish of ▽ 4 ~ 5, the accuracy can be increased to 4 to 5 levels. Drilling range is generally O.25 ~ 80 mm. For those who have cast or forged blank hole, the use of reaming, the finish of ▽ 5 ~ 6, accuracy of 4, reaming range of 10 to 100 mm. For larger holes boring machine boring machine or lathe, the general boring up to ▽ 4 and 4 precision, fine boring up to ▽ 9 ~ 10 and