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制造内燃机气缸套的典型工艺过程是规定直接在自动线上加工铸铁毛坯。在这种情况下可取消事先在万能机床上进行的“O”工序(粗加工)。在自动线上加工时粗加工和半精加工是规定要进行的工序。在作这道工序时,即使毛坯上存在有铸皮且其长度方向及端面的硬度差为HB60～80,也要求保证刀具在规定时间内能可靠地工作。对硬质合金车刀耐用度所作的研究表明,在“O”工序时的耐用度分布在变异系数ν=0.5～1时近似于服从指数规律(图1,a)。此外,还得出:在引起车刀耐用度离散的一些因素中有一个决定性的因素,该因素决定着耐用度的分布规律。对气缸套而
The typical process of making a cylinder liner for an internal combustion engine is the regulation of the machining of cast iron blanks directly on the wire. In this case, the “O” process (roughing) performed on the universal machine beforehand can be canceled. In the automatic online processing roughing and semi-finishing is required to carry out the process. In this process, even if there is cast on the blank and its length direction and the end of the hardness difference HB60 ~ 80, also requires the tool to ensure that within a specified period of time to work reliably. Studies on the durability of cemented carbide turning tools show that the durability distribution at “O” process approximates to the law of compliance with the variation coefficient ν = 0.5-1 (Fig. 1, a). In addition, it is concluded that there is a decisive factor in the factors that cause the durability of the turning tool to be discontinuous, which determines the distribution of durability. On the cylinder liner and