Effect of Spindle Speed on Performance Measures during Rotary Ultrasonic Machining of Fully Sintered Zirconia Ceramic

In order to solve the problems of the complex secondary sintering process, such as the difficulty of controlling shrinkage rate and high fracture rate of pre-sintered zirconia ceramics, a method of complete sintered zirconia ceramics processing by rotary ultrasonic machining was proposed. The experiments of rotary ultrasonic machining and diamond grinding on fully sintered zirconia ceramics were carried out, and the effects of spindle speed on cutting force, maximum edge chipping size, and subsurface damage characteristics were studied. Through comparative analysis, rotary ultrasonic processing can not only reduce the cutting force, effectively inhibit the edge chipping of fully sintered zirconia ceramic material, but also significantly reduce the subsurface micro crack, which is a new way to achieve the low-damage processing of fully sintered zirconia ceramic dental prosthesis.