Processing method of magnesium alloy compressional deformation and mold

The invention discloses a processing method and a die for the extruding deformation of the magnesium alloy, and adopts an extrusion die which unilaterally extrudes, radially flows and molds through a diameter changing angle, the extrusion ratio is four to sixty, antifriction material is uniformly coated in an extruding channel cavity of the die after the die is heated, then the semi finished metal of the magnesium alloy which is processed in uniformization is heated and put in the extrusion cavity of the heated die, and then passed through the downwards moved terne die of the extrusion die, with the extrusion speed of 0.5 m/min to 3 m/min and the extruding force of 3 MPa to 35 MPa at the same time, the die extrudes from the top end of the semi finished metal of the magnesium alloy in a constant speed, to lead the semi finished metal of the magnesium alloy to flow to the diameter changing cavity channel of the die extrusion cavity to be radially deformed. The invention adopts the unilateral extrusion die which extrudes, radially flows the diameter changing angle to deform, to not only hugely improve the refined effect of the magnesium alloy crystal grain, to lead the synthetic mechanical property of the magnesium alloy material to be improved, but also to achieve the extrusion speed to keep under the state of low temperature extrusion, to keep the quality of the shaped sample piece, thereby improving the production efficiency of the extrusion deformation process of the magnesium alloy.