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The effect of tooling temperature on the formability of sheet steel

Journal of Materials Processing Technology
Publication Date
DOI: 10.1016/0924-0136(94)90401-4


Abstract This paper describes the results of an investigation that was made to determine the effect of controlling the punch and die temperatures on the drawability of cylindrical sheet metal cups. Tooling temperatures may reach 100 to 200°C in commercial press forming operations due to the work of deformation and interference friction. For this reason, circular blanks of aluminum-killed drawing quality (AKDQ) steel sheet were press formed into cylindrical cups using various punch and die temperature combinations in an attempt to control the strength and drawability of the sheet metal. Increasing the die temperature from 20°C to 125°C had little or no effect on sheet formability regardless of punch temperature. Cooling the punch to temperatures between 5 and 10°C, however, increased the limiting drawing ratio by about 15% and increased the forming height by approximately 50%. These observations are rationalized on the basis of the strength vs. temperature relationship for the aluminum-killed steel.

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