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Friction measurements of a square box deep‐drawing process

The role of the lubricant during square box forming has been studied with a drawing lubricant performance assessment simulation system. Probes and sensors set up in different parts of the die are used to obtain the friction coefficient directly during drawing. The main finding is the validation of the relationship of the friction coefficients at the box corner, at the box side, and at the box side furthest away from the punch position. Also, a mathematical model has been set up. This model can be used to study the use of lubricant during large‐scale blank forming or to provide a new way to determine the friction boundary conditions in computer simulations.