关键词: 水平强制振动, 振动式光整加工, 钛合金, 表面粗糙度, 显微硬度, 残余应力

Abstract:  To explore the influences of horizontal forced vibration finishing on the surface integrity of TC4 titanium alloy specimens， a single factor experiment was designed to analyze the effects of main processing parameters on surface roughness， microhardness， surface residual stress and contact angle， a better combination of processing parameters was obtained. The changes of the surface morphology， microstructure and surface lattice of the specimens were analyzed before and after processing under the optimal parameters. The results show that particle diameter is the main factor affecting surface roughness， microhardness and surface residual stress. As the particle diameter becomes larger， the roughness reduction rate increases first and then decreases， and the microhardness and surface residual compressive stress become larger. With the increasing of amplitude and frequency， the decreasing rate of surface roughness， microhardness and surface residual compressive stress increase. The maximum decreasing rate of surface roughness Ra， Rq， Rz， Rt and RSm may reach 65.0%， 62.2%， 45.2%， 42.0% and 73.7% respectively. Microhardness may be increased from 320.8HV0.1 to 363.9HV0.1. The residual compressive stress may be changed from -420.38 MPa to -621.25 MPa. The surface peaks are removed. A dense layer is formed on the surface， and the grain structure is refined. The diffraction peak is shifted and the greater residual compressive stresses are introduced. 

Key words: horizontal forced vibration, vibration finishing, titanium alloy, surface roughness, microhardness, residual stress