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柴油机汽缸盖上的进、排气导管孔内径为D=φ22H7,孔深为285mm,孔的表面粗糙度为Ra1.25μm,孔的轴线直度误差为0.03mm,圆度误差为0.009mm,孔的深径比为13。为此,我厂设计制造了深孔加工用的精铰、挤光复合铰刀(见附图)。经生产实践,取得较好的效果,孔表面粗糙度可达到Ra1.25～0.63μm(部分可达到Ra3.2μm),孔的直度及圆度也达到设计图纸要求。 1.刀具的结构和特点 (1)该刀具是由刀体与硬质合金刀片组成,刀具全长为465mm,刀体材料为40Cr,刀体硬度为HRC35～40,柄部硬度为HRC45～50。
Diesel engine intake and exhaust manifold hole diameter D = φ22H7, hole depth of 285mm, the hole surface roughness Ra1.25μm, hole axis straightness error of 0.03mm, roundness error of 0.009mm, hole The aspect ratio is 13. To this end, I plant design and manufacture of deep hole processing with precision hinge, light composite reamer (see photo). The production practice, and achieved good results, hole surface roughness can reach Ra1.25 ~ 0.63μm (some can reach Ra3.2μm), hole straightness and roundness also meet the design requirements. 1. The structure and characteristics of the cutter (1) The cutter is composed of a cutter body and a carbide blade, the total length of the cutter is 465mm, the cutter body material is 40Cr, the cutter body hardness is HRC35-40, the handle hardness is HRC45-50 .