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在钻床上加工圆柱形工件中的高精度孔,如不使用夹具,质量往往不够稳定,孔的中心綫与工件轴綫会发生偏移,有时会超过0.5毫米;孔和孔间的距离只能根据划綫决定,孔的表面光洁度也较差,一般只能达到(?)(?)6,例如,镗杆上固定镗刀用的孔,加工时更感困难,它的轴线既要与镗杆上已加工好的长方孔相垂直,与长方孔一边的距离要准确控制,又要通过镗杆的轴绫,允差仅为0.03毫米。
High precision holes in cylindrical workpieces are machined on the drilling machine, and the quality is often not stable if the jigs are not used. The centerline of the hole is offset from the workpiece axis by more than 0.5 mm. The distance between holes and holes can only be For example, the hole for boring a boring bar on the boring bar is more difficult to process. Its axis is not only boring with the boring The rectangular holes on the pole have been machined perpendicularly, the distance from the side of the rectangular hole must be precisely controlled, and the axis of the boring bar must pass through the shaft with a tolerance of only 0.03 mm.