高压CO_(2)冷却切削高温合金GH4169的切削特性研究

Research on Cutting Characteristics of High Pressure CO_(2)Cooling Cutting High Temperature Alloy GH4169

以高压CO_(2)为冷源和切削液载体的冷却润滑加工技术,能有效改善难加工材料加工质量并具有环保优势,其工艺有待深入开发。结合CO_(2)热力学状态、流体运动方程以及传热模型,建立了各冷却加工参数之间的联系。基于有限元对高压CO_(2)冷却切削GH4169的过程进行计算与分析,考察各工艺参数对切削性能的影响。结果表明,相比干切和浇注式切削,CO_(2)介入后能明显改善切削力、切削温度以及表面残余应力。提高CO_(2)喷射压力可以降低切削力与温度,喷射角度和喷嘴半径对切削力和温度呈现非单调性变化,在一定范围内存在最佳值。适当增大喷射压力可促进切屑断屑。

The cooling lubrication machining technology using high-pressure CO_(2)as the cold source and cutting fluid carrier can effectively improve the processing quality of difficult to machine materials and has environmental advantages.Its process needs to be further developed.Combining the CO_(2)thermodynamic state,fluid motion equation and heat transfer model,the relationship between the cooling processing parameters was established.Calculate and analyze the process of high-pressure CO_(2)cooling cutting GH4169 based on finite element analysis,and investigate the influence of various process parameters on cutting performance.The results show that compared to dry cutting and casting cutting,CO_(2)intervention can significantly improve cutting force,cutting temperature,and surface residual stress.Increasing the CO_(2)injection pressure can reduce cutting force and temperature.The injection angle and nozzle radius exhibit non monotonic changes in cutting force and temperature,and there is an optimal value within a certain range.Increasing the injection pressure appropriately can promote chip breakage.