基于平均切削厚度钛合金TC4铣削机理

The Milling Mechanism of Ti6Al4V Based on Average Cutting Thickness

选用航空领域应用最广泛的钛合金TC4,基于平均切削厚度进行大量铣削试验,通过切削温度、切削力、切削振动、切屑变形等方面研究其铣削机理.试验结果表明,平均切削厚度是影响铣削性能的重要参数;保持平均切削厚度不变,在一定范围内调整径向切削深度和每齿进给,不论是切削温度、切削力还是振动变化都很小,可以认为具有相同的切削效果.同时,还归纳出不同铣削速度段下切削温度随平均切削厚度的变化规律及切屑变形的特性,并指出选择合适的平均切削厚度进行铣削加工TC4,不仅可以提高刀具耐用度而且可以改善加工表面质量.

The milling mechanism of Ti6Al4V was studied by means of comparing cutting temperature, cutting force, cutting vibration and chip deformation based on average cutting thickness. The experimental conclusion shows that the average cutting thickness plays an important role during side milling of Ti6Al4V . Due to the little variation of cutting temperature, cutting force and vibration, the milling performanee can be considered as changeless at a constant average cutting thickness which is controlled by adjusting radial cutting depth and feed per tooth within a certain range. The effect of average cutting thickness on the variation of cutting temperature was obtained in the work. Both the tool life and machined surface quality are improved a lot with an optimal average cutting thickness.