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近年来,带化学热处理保护层的刀具在前苏联及其他一些国家的使用量有很大的增长。为了评定刀具保护层的性能,提出了一种基于测量热电动势的方法。图1所示为测量示意图。毛坯11装于车床的卡盘6内,而镶有刀片10的车刀9装于刀夹内。刀片10用化学热处理方法复以保护层。车刀用衬垫8与机床绝缘。毛坯与车刀之间由电路连接,电路由与毛坯和挠性轴2在电气上连接的心轴4、水银滑动触点1、导线3、测量或记录仪表5(如毫伏计或示波器)和导线7组成。为了测定保护层的寿命,毛坯按切削速度作旋转运动,而车刀则作纵向进给运动。切削过程中,车刀和毛
In recent years, the use of tools with chemical heat treatment of protective layer in the former Soviet Union and other countries have increased the use of great growth. In order to evaluate the performance of the tool protective layer, a method based on the measurement of thermoelectromotive force was proposed. Figure 1 shows the measurement diagram. The blank 11 is mounted in a chuck 6 of a lathe, and a turning tool 9 fitted with a blade 10 is mounted in a holder. Blade 10 is chemically bonded to a protective layer. The tool insert 8 is insulated from the machine. The blanks and the turning tool are electrically connected by a circuit consisting of a spindle 4 electrically connected to the blank and the flexible shaft 2, a mercury sliding contact 1, a conductor 3, a measuring or recording instrument 5 such as a millivoltmeter or an oscilloscope, And wire 7 composition. In order to determine the life of the protective layer, the blank is rotated at the cutting speed while the turning tool is fed in the longitudinal direction. Cutting process, turning tool and hair