超声振动磨削纳米氧化锆陶瓷材料的磨削力及表面残余应力的研究

Study on grinding force and residual stress of nano ZrO_2 ceramics during ultrasonic vibration grinding

纳米陶瓷由于其相对于工程陶瓷优越的力学性能及物理特性,在各行业都有广泛的应用前景。采用超声复式加工方法,针对不同的磨削参数对纳米ZrO2陶瓷进行了普通和超声磨削实验,研究了磨削参数对磨削力的影响,并通过X射线衍射分析了在普通和超声磨削状态下对工件表面残余应力及纳米ZrO2陶瓷各晶相的影响。研究结果表明:利用超声振动磨削能有效减少磨削力,不同的磨削方式对纳米ZrO2陶瓷表面残余应力影响较大,采用普通磨削工件表面残余应力为拉应力,当超声振动方向平行于砂轮速度方向时,工件表面残余应力为压应力,振动方向垂直于砂轮速度方向时工件表面残余应力绝对值较小。

In contrast to conventional engineering ceramics,nano ceramics possesses excellent mechanical property and physical characteristics,so it has tremendous application prospect.The influences of different parameters on grinding forces were studied under the condition of conventional grinding and ultrasonic vibration grinding.In addition,the residual stress of surface and crystalline phase transformation under the condition of conventional grinding and ultrasonic vibration grinding were analyzed by X-ray diffraction.The research results indicated that the grinding forces could be reduced effectively by ultrasonic vibration assisted grinding.The residual stress of nano ZrO2 ceramics surface is determined much by different grinding styles.Surface residual stress is tensile when nano ZrO2 ceramics is ground in traditional method.Compressive stress is obtained on the surface when vibration direction is parallel to wheel speed,and the value of residual stress decreases much when vibration direction is vertical to wheel speed.