(1) Die cavity diameter (ie working diameter) D=D`+δ`D` Where D is the outer diameter of the extrusion, δ`——the shrinkage of the steel, which can be δ`=1.2%~1.5% (2) outer diameter of the bottom of the die D1=(2.5～3.0)D (3) Hole diameter of the bottom plate of the die jacket D2=D1-(20mm～30mm) (4) Diameter of the inner surface of the die D3=(1.3~1.7)D (5) Outer die outer diameter D5=(1.2~1.3)D (6) the height of the inner die of the die h=h0+(3~5)R Where h0——the height of the blank in the cavity, the mold takes h0=35mm R——the radius of the fillet at the entrance of the die, generally takes 2~5mm (7) Die and template positioning height H`=(0.1～0.2)D (8) concave die height H=h+h (9) Outer cone taper α=(10°～15°) (10) The inner wall taper of the concave model cavity (ie, the draft angle) β=(0°10`~0°20`) The material of the anti-extrusion die can generally be 3Cr2W8V and 5CrMnMo, the heat treatment hardness is HRC50-55, and the die life is generally about 3000 pieces. 3. Calculation of the main dimensions of the anti-extrusion punch In the calculation of the main dimensions of the anti-extrusion punch (Fig. 5), the requirements of the extrusion drawing must first be satisfied, and the dimensions of the remaining parts can be calculated on the basis of determining the working diameter d of the punch. Figure 5 reverse extrusion die (1) Punch working diameter d=D"+δD " Where D" - the inner diameter of the extrusion, (2) Punch end diameter D2=(0.5~0.7)d (3) Diameter rod diameter D1=0.95d (4) Punch fastening part diameter D=d+(1+2htanα) (5) the height of the free part of the punch H=(2~7)d1 (6) Height of the punching part h=(1.3～1.8)d (7) the height of the working part of the punch H1=(0.3~0.5)d (8) The height of the transition of the punch is reduced H2=(0.3~0.7)d1 (9) Punch fastening part taper α=(10°～15°) (10) Punch work taper β=(120°～160°) The material of the anti-extrusion punch can generally be 3Cr2W8V and 5CrMnMo, the heat treatment hardness is HRC55-60, and the service life of the mold can reach 3000~5000 pieces. Previous page Resin fiber dsics are designed for blending edged ,seams and corners,weld grinding and deburrning.make by electrostatically depositing grains of aluminum oxide /calcined aluminum /silicon carbide /zircon on heavy duty velcanized fiber backiing with heat-resistant phenolic resins . it is mainly used in all kings of metal and non-metallic materials.it is suitable for shipbuilding ,automobile, aviation,machinery, bridge and construction industry. Fiber Disc,Fibre Sanding Disc,Fiber Discs For Grinder,Fiber Cutting Disc Henan Yuteng Abrasives Co.,Ltd , https://www.henanyutengabrasives.com