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我厂在研制一种大功率高速柴油机时,活塞顶面的机械加工遇到了很大困难,其主要原因是,活塞顶面有六个与进排气阀相对的月牙形凹坑1,尺寸为R30~(+0·2),及与之相连的在同一平面上的装六个螺柱的孔的突出部分2,其宽度为22(R11)和一个对面有孔的突出部分3,尺寸为R8(见图1)。其余部分,为深度15,直径φ180,用R30~(±0·16)相衔接的光滑型面。突出部分2和3,使车削、
I plant in the development of a high-power high-speed diesel engine, the piston top machining encountered great difficulties, the main reason is that the top of the piston has six intake and exhaust valve opposite crescent-shaped pits 1, the size of R30 ~ (+0.2), and connected to the same plane with six stud holes protruding portion 2, the width of 22 (R11) and a hole 3 opposite the protrusions 3, the size of R8 (see Figure 1). The rest, for the depth of 15, diameter φ180, with R30 ~ (± 0.16) convergence of the smooth surface. Prominent parts 2 and 3 make turning,