Rotary backward-extrusion device and method for manufacturing ultra-fine crystal cup shaped part
A technology of reverse extrusion and cup-shaped parts, which is applied in the direction of metal extrusion dies, metal extrusion mandrels, etc., can solve the problems of large friction resistance and small shear deformation, so as to reduce friction resistance, reduce load, and improve Effect of shape and dimensional accuracy
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[0037] Example: such as Figure 1-Figure 6Shown: a rotary back-extrusion device for preparing ultra-fine crystal cup-shaped parts, including punch holder 1, back-extrusion punch 2, extrusion cylinder 3, pad 5, ejector rod 8, and lower template 6; The outer surface of the reverse extrusion punch 2 is provided with a spiral boss, the upper end of the reverse extrusion punch 2 is connected with the punch holder 1, the reverse extrusion punch 2 is set in the extrusion cylinder 3; the center of the extrusion cylinder 3 is opened There is a circular through hole; the pad 5 is placed in the extrusion cylinder 3, the upper surface of the pad 5 is provided with a spiral groove, and the lower end of the pad 5 is provided with a polygonal boss; the center of the lower template 6 is provided with a polygonal through hole; The shape of the ejector rod 8 is a polygon, and it is placed in the through hole of the lower template 6. The lower template 6 is connected with the extrusion cylinder ...
example 1
[0049] Example 1: The diameter of the initial blank 4 is 17mm, the height is 40mm, the material is 1100Al, the maximum diameter of the reverse extrusion punch 2 is 12.5mm, the number of turns of the gradual boss 2-2 is 2 turns, and the number of turns of the equal-section boss 2-3 is 1 turn, the maximum height of the boss is 1.25mm, the pitch of the helical boss is 8.3mm, the rotation speed of the reverse extrusion punch 2 is 50 rpm, and the pressing depth is 35mm. In this case, the equivalent strain and load of the cup after rotating back extrusion are as follows: Figure 7 and 8 As shown, it can be seen that the maximum equivalent effect becomes 9.26, and the maximum axial load acting on the reverse extrusion punch is 2.2 tons, and when the billet is in contact with the spiral boss, the load drops significantly below 1.2 tons. The maximum equivalent effect of reverse extrusion of the table and non-rotating punch becomes 4.2, and the maximum axial load of the punch is 4.8 to...
example 2
[0050] Example 2: The diameter of the initial blank 4 is 17mm, the height is 40mm, the material is 1100Al, the maximum diameter of the reverse extrusion punch 2 is 12.5mm, the number of turns of the gradual boss 2-2 is 2 turns, and the number of turns of the equal-section boss 2-3 is 1 circle, the maximum height of the boss is 1.25mm, the pitch of the helical boss is 8.3mm, the rotation speed of the reverse extrusion punch 2 is 300 rpm, and the depression depth is 19mm. In this case, the maximum equivalent effect after rotary reverse extrusion becomes 33.9, and the maximum load is 1.75 tons, indicating that increasing the rotation speed will significantly increase the degree of deformation of the billet, and the degree of deformation will significantly refine the material structure, and the increase in the rotation speed will further reduce deformation load.
[0051] The above simulation results show that rotary back extrusion is a better method than conventional back extrusio...
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Abstract
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