Process Characteristics Of Shell Stretching And Stamping Parts

The shell stretching stamping part is a stamping part processed using stretching technology. Stretching is the process of pressing a flat metal sheet into a die through the movement of a punch. The application of shell stretching stamping parts is very extensive, such as for automotive parts, household products, electronic devices, and so on.
The shell stretching and stamping parts can stretch the sheet metal into cylindrical bottle shaped parts; In the stretching operation, the diameter of the blank is affected by the circumference of the shell, which is in turn affected by the fluidity of the stamping material and the inward flow resistance and edge resistance of the peripheral material; When the resistance of the edge material exceeds the limit, the edge will wrinkle and become unstable.
To avoid wrinkling, it is necessary for the stamped part material to flow smoothly between the punch and the blank holder. The two main reasons for tensile fracture are that the ratio of the diameter of the stretched stamping part to the diameter of the blank exceeds the limit value, and when the stretching radius deepens from a flat blank to a shell, and the shell is stretched to a smaller diameter shell, there is a limit value for the inward flow distance of the material, commonly referred to as the stretching coefficient.
The ultimate tensile coefficient is influenced by factors such as the flowability of the stamping material, its compressive strength, and the flow resistance caused by compression. Excessive flow resistance causes damage and wrinkling at the edge of the shell, which is an area with weak material resistance.