THE INFLUENCE OF SURFACE ROUGHNESS ON THE DEFORMING FRICTION BEHAVIOR OF AL-MG ALLOYS

摘要

The inhomogeneous morphology of the surface asperities generated during metal forming causes strain localization resulting in tearing during metal forming, and increasing friction between mating die surfaces. Much of the data in the literature do not account for the influences of variations in metallurgical conditions on the friction behavior. A prototype apparatus has been developed to simulate the friction behavior in the region of a drawbead and thereby enable assessment of the influences of metallurgical variables and changes in the microstructural conditions that occur under deforming loads. The results of this study demonstrate that measurement system is capable of distinguishing changes in the coefficients of static and sliding friction in the test data, and that the wear scars are suitable for detailed microstructural analyses. Thus, the design generally meets the necessary criteria for the experimental technique and it is appropriate for further development.