การศึกษาอิทธิพลความหยาบผิวของดรอว์บีดที่มีผลต่อการลากขึ้นรูปโลหะแผ่น ที่มีรูปทรงไม่สมมาตรโดยการจําลองด้วยไฟไนต์เอลิเมนต

Abstract

It is well known that the dragging process There are many factors that affect the quality of a workpiece, such as lubricant, friction, and mechanical properties of the material, etc. These are all reasons why. Causing defects on the workpiece Especially workpieces that are asymmetrical To achieve consistency And the integrity of the forming process must control the flow of the workpiece material. Using drawbeads is another One method is used to control the flow of the workpiece. However, the resistance to the flow of the workpiece Not just the shape of the drawbead It is also caused by friction from the surface of the drawbead as well, with different surface drawn drawbeads resulting in different friction.
This research aimed to study the shedding of sheet metal in the asymmetrical dragging process by using drawbeads of different surface roughness. And to simulate with finite element method This study used a semicircular drawbeed. 3 grades of surface roughness were defined as 0.152 Ra, 0.963 Ra and 6.127 Ra. Materials used in the study were cold rolled steel grades JIS: SPCC, SPCD and SPCE. ) 50 percent of the force obtained from the calculation.
The results showed that the roughness of the drawbead surface had an effect on the flow of the workpiece. There are drawbeads. The high surface roughness results in the workpiece being more prone to tearing and wrinkling, while the less roughness of the drawbeads is Minimal creases And does not cause tearing Simulation with finite elements and The results of the actual experiment (Experiment) show the behavior of sheet metal forming. That is the trend of Consistent results The application of finite elements can predict and find solutions to the finite element. Efficient flow of the work piece in the form of traction.