Thermographic Study on Temperature of Tool-Chip-Work System in Wood Cutting

为了研究刀具、切屑和工件等切削系统的热行为，利用热像仪获得了刀具、切屑和工件侧面的近距离热图像，并对刀具、切屑和工件进行了正交切削，切削速度为500 mm/min，切削深度为一定深度。此外，数值计算了在实际切削速度数量级的较高滑动速度下，刀具在与木材摩擦时刃口附近的温度。结果总结如下：1。1 .刀具温度在切削开始时迅速上升，在50mm长度切削过程中达到稳定状态，0型和II型切屑形成在切削边缘周围呈同心分布，而I型切屑形成由于切屑的周期性断裂，刀具温度呈周期性变化。0型和II型切屑的温度沿切屑长度方向均匀，最高温度出现在靠近切削刃的前刀面上。然而，I型晶片只有在断裂点才显示出明显的温度升高。数值分析发现，在实际切削速度下，刀具温度即使在与木材的摩擦中也必须上升几百度，在切削刃附近的前刀面温度最高。

In order to examine the thermal behavior of a cutting system, including tool, chip and work, closeup thermal images of the side face of tool, chip and work were obtained using a thermographic device during the orthogonal cutting of mizume (Betula grossa) with a few tools of different clearance and rake angles at a cutting speed of 500 mm/min and at some depths of cut. Furthermore, the tool temperature near the cutting edge in frictional rubbing against wood were numerically calculated for higher sliding speeds of the order of practical cutting speeds.Results are summarized as follows:1. The tool temperature rose rapidly at the beginning of cutting and reached steady states during the cutting of a 50 mm length showing concentric distributions around the cutting edges for the chip formations of Types 0 and II, while it varied periodically for the Type I chip formation due to the cyclic breakage of chips.2. The temperature of chips was uniform along the length of the chips of Type 0 and II and the maximum temperatures appeared on the rake face close to the cutting edge. Chips of Type I, however, showed a distinct temperature rise only at the breaking points.3. It was found from the numerical analysis that the tool temperature must rise several hundreds degrees even in frictional rubbing against wood at practical cutting speeds showing the maximums on the rake face near the cutting edge.