LUBRICATION AND THE CHOICE OF LUBRICANTS FOR DEEP-DRAWING

Abstract

The role and the importance of lubricants and lubrication in the process of metal forming are complex, and have been the object of many researches. In deep drawing of thin sheets the tribological conditions influence the forming process in a very complex manner and on equal terms with other elements of the forming system (machine, tool, material). The comments on the significance of the optimal choice of the lubricant for deep drawing, the methods and procedures for the evaluation of the technical quality of the lubricant are given in this paper. For two basic procedures of research, so called "complex" tribological models - stretching and pure deep drawing, and many investigated lubricants, the results are given from different categories: limit relations in forming and presentation in forming limit diagram. The compared results for stainless and low-carbon steel sheets in drawing sxis-symmetrical and square-section parts, are given.