Differential extrusion forming die of high-performance magnesium alloy cup-shaped part
A technology for extrusion forming and cup-shaped parts, which is used in metal extrusion dies, metal extrusion mandrels, etc.
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[0055] Take the preparation of an AZ31 magnesium alloy cup with an outer diameter of 200 mm and an inner diameter of 170 mm as a specific example.
[0056] The blank size used is H=360mm, diameter D 1 =80mm, "T" shape upper die 4 cavity diameter D 2 = 90mm, D 1 2 . The whole mold is preheated to 400°C for 2 hours, and the magnesium alloy billet is heated to the forming temperature of 350°C and held for 2 to 4 hours. The extrusion speed of the punch is 1 mm / s.
[0057] Such as Figure 3-1 As shown, 4 to 8 vertical holes are provided on the upper end of the "T" shaped upper die 4 along the axial equidiameter as the small holes for feeding lubricant.
[0058] Such as Figure 3-2 As shown, the length L2 of the sizing belt of the "T"-shaped upper die 4 is 8.8mm, and the length L1 of the sizing belt of the "U"-shaped lower die 5 is 24mm; Considering the pressure angle, the connection surface between the sizing belt at the lower end of the "T"-shaped upper die 4 and the horizo...
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