Study on Tools with Restricted Tool-Chip Contact Length (Part 6)
Study on Tools with Restricted Tool-Chip Contact Length (Part 6)
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刀具与切屑接触长度受限的刀具研究（第六部分）
DOI：
10.2493/jjspe1933.34.113
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发表时间：
1968
影响因子：
--
通讯作者：
E. Usui
中科院分区：
文献类型：
--
作者：
K. Hoshi;E. Usui
描述了各种硬质合金和高速钢切削刀具加工低碳钢和中碳钢时的磨损特性和刀具寿命曲线，并与传统刀具进行了比较。虽然人为减少刀具与切屑的自然接触长度通常会减少月牙洼和后刀面磨损，但始终存在接触长度的最佳值，低于该值，刀具寿命就会缩短。最佳长度取决于刀具的侧前角，发现前角越小，长度越短。比较最佳接触长度下的刀具磨损，发现随着前角的减小，后刀面磨损有所增加，但月牙洼明显减少。接触长度充分减小的刀具表现出一种特殊类型的凹坑，该凹坑不是形成在第一前刀面上，而是主要沿着第二前刀面形成。前人论文中提出的切削机理理论很好地解释了这一特点。即使在高速加工中，不仅切削温度而且切削刃的形状对刀具磨损也非常重要。磨损机制似乎可以解释为应力依赖性速率过程。
Wear characteristics and tool-life curves in machining of low and medium carbon steels with various types of cut-away tools made of carbide and high speed steel are described and compared with those for conventional tools. Although an artificial reduction of natural tool-chip contact length usually reduces both crater and flank wear, there always exists optimum value of contact length below which tool-life is shortened. The optimum length depends on side rake angle of the tool and is found that the smaller the rake angle, the shorter the length becomes . In comparison of tool wear at the optimum contact length, it is found that flank wear is somewhat increased, but crater is substantially reduced as the rake angle is decreased . Tools with sufficiently reduced contact length show a special type of crater which is not formed on the first rake face, but mainly develops along the second rake face . This characteristic is well explained by the theory of cutting mechanism presented in the previous papers . Not only cutting temperature but also shape of cutting edge has a great importance on tool wear even in high speed machining. The wear mechanism appears to be explained as a stressdependent rate process.