In cold forging, a high forming pressure is required to fill the billet material into the corners of the die cavity due to the high flow stress of the steels. To reduce the forming pressure, a method employing an axially driven die is proposed. In this method, the die is moved in the axial direction while the billet material is squeezed by the punch. The corners of the die cavity are filled easily by the help of the frictional force over the billet-die interface. The effectiveness of this methodfor precision forging of a spline is examined by model experiments. The results show that the forming pressure is significantly reduced compared with the conventional closed die forging or the floating die method.
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