การศึกษาสมบัติเชิงกลจากกระบวนการรีดผิวละเอียด ด้วยวิธีการจำลองไฟไนต์เอลิเมนต์

Abstract

In Metal Forming processes, there are restrictions in producing work-pieces with enhanced surface finishes and improvement to the material fatigue strength. Therefore, this paper presents a new idea for the metal forming method which begins with the facilitation of fine surface rolling, for which produces the enhanced surface finish and increases the material strength. FEM- Simulation was carried out for predicting the mechanical property under the work-piece surface which resulted in residual stress in the fine surface rolling process. The hard smooth rolling mill made from ceramic, was 6 mm. diameters. The ceramic ball was rolled and rotated on the work-piece surface 0.2 mm depth under high pressure 150 bar. The results from the FEM-Simulation were compared with the experiment. The results show that: (i) after rolling, the surface roughness of the work-piece increased approximate 2.6 mm: (ii) the residual stress under the work-piece surface, was 800 MPa, thus the surface had more strength, about 60 HV. All the results derived from FEM-Simulation analysis showed reasonable agreement with the experimental application data.