Hot bulge forming method for aluminum-alloy flash buttwelding ring components

Abstract

The invention discloses a hot bulge forming method for aluminum-alloy flash buttwelding ring components, which comprises the following steps of: after heating an aluminum-alloy flash buttwelding ring component subjected to annealing treatment, sleeving the aluminum-alloy flash buttwelding ring component on the periphery of a bulge forming block (subjected to preheating) in a bulge forming machine, and starting the bulge forming machine, so that the bulge forming block extrudes the ring component along the radial direction from the interior circumferential surface of the ring component so as to complete the first bulge forming, wherein the bulge forming temperature is 420-470 DEG C, the bulge forming time is 12-15s, the dwell time is 7-8s, and the deflection is 0.08-0.09%; rotating the ring component at an angle of 45 degrees along a central axis so as to complete the first rotation; then, performing the second bulge forming according to the operations above, wherein the bulge forming temperature is 390-440 DEG C, the bulge forming time is 20-35s, the dwell time is 15-16s, and the deflection is 0.7-0.8%; rotating the ring component again along the direction of the first rotation so as to complete the second rotation; and performing the third bulge forming according to the operations above, wherein the bulge forming temperature is 360-410 DEG C, the bulge forming time is 20-25s, the dwell time is 20-22s, and the deflection is 0.9-1%. The size precision of a ring component subjected to bulge forming can reach 0.1-0.2% of a corresponding size, and the method is mainly used in the field of space navigation.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for an aluminum alloy flash welding ring. Background technique [0002] After the aluminum alloy flash welding ring is welded and formed, due to the influence of the welding process, the welded ring has a straight edge on its circumference, and the high stress of the ring after welding will cause the ring to warp and deform, resulting in It is in the shape of an irregular ring, and its dimensional accuracy is poor. In general, the welded ring can only be used after reaching the required size through a full circle. [0003] The Chinese invention patent specification CN 101367104A published on February 18, 2009 discloses a hydraulic bulging strengthening process for replenishing fluid outside the retaining ring of a turbogenerator. Then inject the closed space formed by the fixed upper cone mold, the moving lower cone mold and the retaining ring through the p...

AI Technical Summary

Problems solved by technology

Since this method relies on the flexible contact between the liquid and the inner peripheral surface of the ring to cold expand the ring, its main function is to strengthen the ring. This method does not disclose in detail how to improve the dimensional accuracy of the ring through bulging, but only It is generally concluded that the purpose of improving the forming accuracy of the retaining ring can be achieved, that is, this method cannot solve the problems of the full circle and poor dimensional accuracy of the flash welding ring in the prior art

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