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研究金属切削过程中切屑和刀具前刀面之间的摩擦现象,找出其变化规律,对了解和控制金属切削刀具的磨损过程及磨损速度,以提高刀具耐用度,具有十分重要的意义。刀具前刀面上的切屑与刀面之间的摩擦条件,比一般机械磨损过程要严酷得多:首先,切屑与前刀面之间的压力很大(可达1.96～2.94GPa以上),加之摩擦速度高,会产生大量的切削热,形成很高的切削温度。因而,在距切削刃一定范围内,切屑底部的金属要和刀具前刀面产生粘结。在粘结区域内,切屑与刀具前刀面的摩擦就不再是一般的外摩擦,而是粘结部份和上层金属之间的相对滑移,即内摩擦过程。所以,切屑与
It is of great significance to study the friction between chips and the rake face of the metal during the cutting process and to find out the regularity of its variation. To understand and control the wear process and the wear rate of the metal cutting tool, it is very important to improve the durability of the tool. The rake condition between the chip and the rake face on the rake face of the tool is much harsher than the normal mechanical wear process. First, the pressure between the chip and the rake face is very high (up to 1.96 to 2.94 GPa) Friction speed is high, will produce a large amount of cutting heat, forming a high cutting temperature. Therefore, within a certain distance from the cutting edge, the metal at the bottom of the chip is bonded to the rake face of the tool. In the bond area, the friction between the chip and the rake face of the tool is no longer normal external friction, but rather the relative slip between the bonding part and the upper metal, ie the internal friction process. Therefore, the chip and