THEORETICAL STUDY OF RADIAL STRESSES IN SHEET METAL FORMING

Abstract

Hydro forming manufacturing process, the fluid pressure contributes positively in several ways for producing of seamless shells, cups and boxes of different shapes. Hydro forming deep drawing process is the one of the hydro forming manufacturing. In this process, applying the hydraulic fluid pressure on blank surfaces in radial direction through punch movement within fluid in fluid chamber, which is provided in die and punch chambers. The fluid pressure is supported for the blank surfaces in entire process. In radial direction, radial stresses are generated in the blank due to punch force on the blank with supported by blank holder force. The radial stresses are evaluated in magnesium alloy with castor oil medium. The radial stresses are decreasing with increases in radial distance is obtained. The automatic co-ordination is developed in between the punch and blank holder