Tool temperature control to increase the deep drawability of aluminum 1050sheet

A feasibility study on the tool temperature control to increase the deep dr awability of A1-1050 sheet is performed. The conventional deep drawings pro cess is limited to a certain limit drawing ratio (LDR) beyond which failure will ensue. The purpose of this study is to examine the possibilities of r elaxing the above limitation through the tool temperature control, aiming t owards a process with an increased LDR. The idea which may lead to this goa l is strengthening the punch-nose radius part by cold punch which has frequ ently been potential failure area in cup drawing process, while heating the remainder of the blank to reduce the stress on the cup sidewalls. Over the ranges of conditions investigated, the deep drawability of A1-1050 is foun d to be strongly sensitive to the temperature of the die and punch. The exp erimental implementation shows that the tool temperature control is very ef fective way to promote deep drawability of A1-1050. (C) 2001 Published by E lsevier Science Ltd.