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淬硬钢以其优良的特性在模具行业中得到广泛的应用。但是在淬硬钢铣削过程中,其本身固有的极差的切削性能使得刀具磨损、破损非常严重,特别在小直径铣刀加工淬硬钢时影响更为突出。文中通过采用直径为2mm的TiAlN涂层硬质合金铣刀对S136淬硬模具钢进行中高速干式切削实验,分析了小直径涂层铣刀切削淬硬钢时切削速度、进给速度和切削深度对切削力的影响规律;提出在提高单位时间材料去除率并且要求切削力尽可能低的情况下,采取提高切削速度的策略要优于增加每齿进给量的策略;通过SEM观察刀具失效形态分别为刀尖破损、侧刃微崩、涂层烧伤与脱落和疲劳裂纹。为小直径铣刀的应用提供理论依据。
Hardened steel with its excellent properties in the mold industry has been widely used. However, in the hardened steel milling process, its inherent poor cutting performance makes the tool wear and tear damage is very serious, especially in the small diameter milling hardened steel processing more prominent. In the paper, the high-speed and medium-speed dry cutting experiments of S136 hardened die steel with TiAlN coated cemented carbide cutter with diameter of 2mm were carried out. The cutting speed, feeding speed and cutting of hardened steel with small diameter coated cutter were analyzed Depth on the cutting force; proposed in improving the material removal rate per unit time and requires the cutting force as low as possible, to improve the cutting speed strategy is better than increasing the feed per tooth strategy; by SEM observation tool failure Morphology were tip damage, side edge micro-collapse, coating burns and loss and fatigue cracks. For the application of small diameter milling provide a theoretical basis.