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  • Modelling and verification of forming of coated thin steel sheet products incorporating frictional slip behaviour between press tool and workpiece


This report is the result of a joint project undertaken by British Steel plc and Rockfield Software Ltd., to investigate the extent and impact of friction between tools and materials used in press forming sheet steel. The aim was to produce a simple computer model which could simulate the frictional behaviour of coated sheet steel when it came into contact with production tools such as the blankholder and die plates. Excessive sliding between production tools and sheet steel can affect the product's surface condition and impair the quality of the coating, especially if this is of a relatively soft material. Conventionally, predictions of the frictional behaviour of coated sheet steel have been derived from computer models which simulate press and steel surface conditions in order to assess the impact of contact pressure on product quality. In this case, frictional coefficients were derived from a simulation of the stretch/ draw test, and predictions were as accurate as those made from the friction model. The team's alternative model was validated through a simulation of the forming of a headland mount and a door inner complex pressing. It is important, however, that the model incorporates details of the geometry of production tools and the lubricant to be used in production. The researchers conclude that provided this is done, their model can produce accurate predictions of the strain profile of tool/ surface friction in the production of coated sheet steels.

Additional information

Authors: GODWIN M J, British Steel plc, London (GB)
Bibliographic Reference: EUR 18397 EN (1998)
Availability: Available from OOPEC Sales agents
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