Method of equal channel angular extrusion

In a method for extruding of material billets by equal channel angular extrusion, an improvement for cost effective multi-pass processing without billet reshaping and reheating, comprising the steps of:

• providing an extrusion apparatus with a base mounted at the bottom plate, a punch, a die having contiguous vertical and horizontal channels of the identical cross-sectional area, a slider operated by a hydraulic cylinder, which forms the bottom wall of the horizontal channel and has a protrusion overlapping the channel;
• providing the material billet of the identical cross-section area with channels;
• moving the slider to the original position in which the slider protrusion coincides with an entrance section of the horizontal channel and locks the vertical channel;
• inserting the well-lubricated preheated or cold billet into the vertical channel;
• extruding the billet by the punch from the vertical channel into the horizontal channel till punch attains the top wall of the horizontal channel;
• slightly moving the punch up;
• moving the slider into an extruding direction till slider releases fully the billet bottom surface;
• moving the punch down and ejecting the billet from the horizontal channel;
• and
• moving the slider to the original position and ejecting the billet from the die into an opposite direction to the extruding direction.

A method of equal channel angular extrusion, comprising the steps of:

• providing an extrusion apparatus with a base mounted at the bottom plate, a punch, a die having contiguous vertical and horizontal channels of the identical cross section area, a slider operated by a hydraulic cylinder, which forms the bottom wall of the horizontal channel and has a protrusion overlapping the channel, and a trimming knife;
• providing the material billet of the identical cross-section area with channels;
• moving the slider to the original position in which the slider protrusion coincides with the an entrance section of the horizontal channel and locks the vertical channel;
• inserting the well-lubricated billet into the extrusion channel;
• extruding the billet by punch from the vertical channel into the horizontal channel till punch attains the top wall of the horizontal channel;
• slightly moving the punch up;
• moving the slider into an extruding direction till full release of the billet;
• moving the punch down and ejecting the billet by punch from the horizontal channel;
• moving the slider to the original position and ejecting the billet from the die into an opposite direction to the extrusion direction;
• and
• trimming a flash at the top billet surface by the knife, which takes place simultaneously with billet ejection from the die.

A device for equal angular extrusion comprising:

• a die defining a vertical channel and a horizontal channel;
• a moveable slider, the moveable slider defining at least in part the horizontal channel;
• and
• the slider moveable in a first extrusion direction during extrusion of the billet and moveable in a second direction opposite the extrusion direction to eject the billet from the tool.