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On the forging die used for die forging, it is used to reduce the partial cross-sectional area of the blank and increase the cross-sectional area of another part so that the volume distribution meets the requirements of the calculated blank drawing. It is one of the billet making steps and also has the functions of rolling, length control and oxide scale removal.
Rolling extrusion die slots are available in two types: open and closed (see picture). These two types of rolling extrusion die slots can be used alone or mixed, that is, the head is open and the stem is closed.
The open rolling extrusion die slot (Figure a) has a rectangular cross-section with open sides. The blank can be expanded freely and has little aggregation effect. It is used to roll-extrude intermediate blanks of shafts with small changes in cross-section. The open mold slot is easy to manufacture.
Closed rolling extrusion die groove Closed rolling extrusion die groove (Fig. b) The cross section of the die groove is oval and the entire side is closed. During forging, the lateral flow of metal is restricted, the axial aggregation effect is large, and the surface of the blank after forging is smooth. It is suitable for forgings with large cross-sectional changes and is not prone to folding during final forging.
It is widely used, but the manufacturing of closed mold grooves is more complicated. In addition to the deformation working part, the rolling extrusion die slot also has jaws (see final forging die slot) and burr grooves. The shape and size of each part are determined individually.
Link to this article：Rolling die slot
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