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我厂495型柴油机汽缸体主轴承孔的精镗是在卧式镗孔专用机上进行的。汽缸体材料为HT20-40,硬度HB170～241,孔径d=76~(+0.03),光洁度(?)6。多年来,其精镗孔光洁度却很少能达到(?)6;为了提高产品质量,我们对此进行了分析研究,并进行了多次试验,效果较好。现介绍如下:我们原来采用的刀具材料为YG6,走刀量δ=0.033mm/r,切削深度t=0.05mm,r=2mm (见图1)。用这种圆弧过渡刃镗刀精镗孔,残留面积的理论残留高度H=δ~2/8r=0.033~2/(8×2)=68×10~(-6)mm=0.068μ。按照光洁度标准(?)6的残留高度H′≤2.5μ,H≤H′,但在实际加工中精镗孔的光洁度却一直不能稳定在(?)6。
495 diesel engine cylinder bore hole in the fine boring machine is boring machine for horizontal. Cylinder material for the HT20-40, hardness HB170 ~ 241, aperture d = 76 ~ (+0.03), finish (?) 6. Over the years, the fine boring finish is rarely achieved (?) 6; In order to improve product quality, we conducted an analysis of this, and conducted several tests, the effect is better. Now introduced as follows: We originally used the tool material YG6, take the amount of δ = 0.033mm / r, cutting depth t = 0.05mm, r = 2mm (see Figure 1). With this kind of arc boring boring boring tool fine boring, the theoretical residual height of residual area is H = δ ~ 2 / 8r = 0.033 ~ 2 / (8 × 2) = 68 × 10 -6 mm = 0.068μ. According to the finish standard (?) 6, the residual heights H’≤2.5μ, H≤H ’, but the finish of the fine boring in the actual machining has not been able to stabilize (?) 6.