钛合金TC4粗加工刀具优选及切削参数优化

Cutting Tool Selection and Cutting Parameter Optimization of Titanium Alloy Rough Milling

针对市场上一些适用于钛合金粗加工的立铣刀,进行了刀具优选的切削试验,选用单元材料可变加工成本作为刀具优选评价指标,对刀具的切削性能进行了量化评价。优选试验结果表明,价格低廉的焊接式硬质合金立铣刀用于钛合金粗加工的性价比较高,整体式硬质合金刀具用于钛合金粗加工并不经济。使用单因素试验法对优选出的刀具进行切削参数优化试验,得到了焊接式硬质合金立铣刀粗加工钛合金时较适用的切削参数范围。同时以不同的加工效率为约束,以单元材料最小加工成本为优化目标函数,对刀具的切削参数进一步优化,使用遗传算法对优化模型进行求解。优化结果显示,焊接式硬质合金立铣刀的加工效率不宜太大,优化得到了刀具较经济的加工效率和较理想的切削参数。

Several end mills suitable for tita- nium alloy rough milling are selected from the market. Cutting tool selection experiments are conducted using those tools. The variable cost of unit volume of material is used as the cutting tool selection indicator. It is used to quantitatively evaluate the pertbrmance of cutting tool. The selection experiment results show that the welded carbide end mill is more appropriate for titanium alloy roughmilling because of its low price. The solid carbide end mills are expensive for titanium alloy roughmilling. A single factor cutting experiment is done to optimize the parameters of the welded carbide end mill. An optimum range of cutting paraineters is obtained. By using different machining efficiency as constraints, the minimum cost of unit volume of material as optimized objective function, optimization models are set up. The models are solved by the genetic algorithm. The optimization results show that the welded carbide end mill machining efficiency shouldnot be too high. The economic machining efficiency and the optimized cutting parameters are obtained..