SG砂轮磨削航空合金温度研究

钛合金和高温合金的导热性差,磨削过程中产生的高温不仅加速砂轮的磨损,而且降低工件表面质量,磨削温度是影响磨削过程的重要参数。本文重点阐述了夹丝半人工热电偶法测温原理及标定方法,并对不同磨削条件下磨削航空合金的温度进行了实验研究。实验选用新型陶瓷氧化铝SG砂轮和普通GC砂轮,分析磨削温度信号的物理意义,系统地研究了磨削用量、磨削方式、砂轮类型以及工件材料对航空合金磨削时温度的影响,为航空合金的高效高精度磨削加工工艺优化提供实验依据。

Study on Grinding Temperature in Aeronautical Alloys with SG Wheels

The poor conductivity of titanium alloys and high temperature alloys results in concentration of high temperature at the tool work-piece interface in the grinding process, which not only accelerates abrasive wear but also leads to degradation in work-piece quality, so grinding temperatures have important influence on grinding process. Principle of temperature measurement of implanted thermocouple and calibration method of quasi-artificial thermocouple were detailed. Experimental studies on grinding temperature during grinding these two kinds of aeronautical alloy were conducted, and the sol-gel alumina abrasive wheel and the conventional abrasive were used in the experiment respectively. Grinding temperature signal was firstly analyzed, and then the influence on the grinding temperature of different grinding conditions was discussed: including grinding parameters, grinding mode, coolant condition, different kinds of wheels and different kinds of work-piece material used in experiment. The results provide a experimental basis for technical optimization in the grinding of aeronautical alloys with high-efficiency and high-quality.