钛合金螺旋铣孔参数对表面粗糙度影响研究

Study on the influence of helical milling parameters on surface roughness of titanium alloy

螺旋铣削作为一种新工艺在钛合金制孔方面得到广泛应用,表面粗糙度是评价钛合金孔加工质量的重要指标。基于Matlab建立钛合金螺旋铣孔表面粗糙度预测模型,开展钛合金螺旋铣孔实验,研究发现：在0.15-0.25 mm/rev范围内,随着螺距的增大,钛合金孔表面粗糙度呈现先减小后增大的变化趋势;在0.03-0.05 mm/tooth范围内,随着切向每齿进给的增大,表面粗糙度呈现先逐渐增大后减小的趋势;类似的,在2 500-3 500 r/min范围内,随主轴转速的提高,表面粗糙度变化曲线呈现先升高再降低的规律,但之后又有平缓上升的趋势。研究结果可为钛合金螺旋铣孔参数优化及表面粗糙的控制研究提供重要实验依据。

As a new technology, helical milling has been widely used in hole-making of titanium alloy, and the surface rough- ness is an important indicator for evaluating the quality of titanium alloy hole. In this paper, the helical milling experiments are carried out to study the effect of machining parameters on the surface roughness with the model established in Matlab. It is proved that the model can well predict the influence of the helical milling parameters on surface roughness. With screw pitch increasing, the surface roughness of titanium hole firstly decreases and then increases in the range of 0.15-0.25 mm/rev. However, the surface roughness increases gradually at first and then decreases with the increasing of the feed per tooth in the range of 0.03-0.05 ram/tooth. Similarly, with the increasing of spindle speed, the surface roughness firstly increases, then decreases, and again gradually increases smoothly in the range of 2 500- 3 500 r/min. The results in the work can provide experimental basis for optimizing cutting parameters and decreasing surface roughness in helical milling process.