Abstract
Application of regression method for determining the die land dimensions based on data from industry
Highlights
Closed-die forging is one of the oldest and most common forming technologies for manufacturing the finished and semi-finished products
Additional mass of the raw material is necessary in order to guarantee the absence of underfilled hollows in the die cavity
It is well known that the excess volume of the billet does not by itself assure the filling of the die cavity
Summary
Closed-die forging (with flash) is one of the oldest and most common forming technologies for manufacturing the finished and semi-finished products. About 70% of the parts produced in Europe were forged by closed-die forging [1]. For this forming technology it is characteristic that the volume of the forged part /billet is greater than the volume of the finished part. Excess material is a consequence of inaccuracy while determining mass (volume) of the raw material with respect to the mass of the pure forged part as well as the tendency to do complete filling of the die cavity. Material flows outside of the die cavity so the width of the flash continually increases, while its thickness decreases. Material flow in radial direction is predominantly replaced by material flow in the axial direction, and in this way the remaining hollows in the forging die are filled
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