Thermal bulging method for high-temperature alloy flashing welding ring piece

Abstract

The invention discloses a thermal bulging method for a high-temperature alloy flashing welding ring piece. The thermal bulging method comprises the following steps that: the high-temperature alloy flashing welding ring piece subjected to annealing treatment is heated and then sheathed on the periphery of a preheated bulging block in a bulging machine; the bulging machine is started to enable the bulging block to extrude the ring piece along the radial direction from the inner circumferential surface of the ring piece so as to complete the first bulging, wherein the bulging temperature is within 800 DEG C-950 DEG C, the bulging time is within 22s-28s, the pressure-holding time is within 10s-12s, and the deformation is within 0.6%-0.8%; the ring piece rotates by 45 degrees along the central axis to complete the first rotating; the second bulging is carried out according to the operation above, wherein the bulging temperature is within 770 DEG C-920 DEG C, the bulging time is within 25s-30s, the pressure-holding time is within 20s-22s, and the deformation is within 0.7%-0.9%; the second rotating is completed by rotating the ring piece again towards the direction the same as that of the first rotating; and the third bulging is carried out according to the operation process above, wherein the bulging temperature is within 740-890 DEG C, the bulging time is within 30s-40s, the temperature-holding time is within 26s-28s, and the deformation is within 0.8%-1%. The dimensional precision of the bulged ring piece can reach 0.1%-0.2% of the corresponding dimension, and the thermal bulging method is mainly applied to 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 a superalloy flash welding ring. Background technique [0002] After the high-temperature 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 th...

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, it is only suitable for some materials with small deformation resistance, and its main function is to strengthen the ring. For materials with greater deformation resistance, such as High-temperature alloys are not applicable; and this method does not disclose in detail how to improve the dimensional accuracy of the ring through bulging, but 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 in the prior art. There are problems with poor roundness and dimensional accuracy of flash welded rings

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