GH4169合金的铣削过程及刀具磨损下的热力耦合研究

Milling Process of GH4169 Alloy and Thermodynamic Coupling Study under Tool Wear

GH4169合金是一种镍基高温合金,具有高屈服强度、高抗拉强度,能够持久的在高温条件下工作。本文首先分析了GH4169合金铣削过程中的相关理论,然后基于AdvantEdge软件对等效二维切削模型进行铣削有限元分析和实际测量,设置不同的加工参数,重点关注铣削过程中铣削力和铣削温度的变化趋势。接下来对不同刀具磨损程度下的铣削过程进行有限元分析和实际测量,研究了刀具磨损情况对于铣削力和铣削温度的影响。研究发现,铣削过程中切削力先上升后下降,铣削工艺强度越高,试件趋于稳定的整体温度越高;随着刀具磨损量继续增大,铣刀实际切削的厚度减小,致使铣削过程中的铣削力及铣削产热量减小,热影响层深变浅。本文得出的结论对今后GH4169合金及其余高温合金的加工和工艺优化具有指导意义。

GH4169 alloy is a nickel-based high-temperature alloy with high yield strength and tensile strength that can work for a long time at high temperature. In the present work, we first examined the theo-ry of the GH4169 alloy milling process, and then we performed milling finite element analysis by using AdvantEdge software for an equivalent two-dimensional cutting model and actual measure-ment, set various machining parameters and paid attention to the trend of milling force and tem-perature during the milling process. Next, finite element analysis and actual milling process meas-urements at various tool wear levels were performed to investigate the effect of tool wear on milling force and temperature. It was found that the cutting force increased and then decreased during the milling process, and the higher the intensity of the milling process, the higher the overall tempera-ture of the specimen tends to stabilize;as tool wear increased, the actual thickness of the milling cutter decreased, resulting in a decrease in milling force and heat production during the milling process, and the depth of the thermally affected layer became shallow. The conclusions reached in this paper will be useful in the future machining and process optimization of GH4169 alloy and oth-er high temperature alloys.