Thermal bulging process for special-shaped high-temperature-alloy rolled ring workpieces

Abstract

The invention discloses a thermal bulging process for special-shaped high-temperature-alloy rolled ring workpieces, which includes steps of primary bulging; primary rotation; secondary rotation; secondary bulging and tertiary bulging. In the primary bulging, a special-shaped high-temperature-alloy rolled ring workpiece which is treated by thermal rolling is sleeved on the periphery of a preheated bulging block in a bulging machine, and the bulging block squeezes the ring workpiece axially along the inner circumference of the rolled ring workpiece after the bulging machine is started so that the primary bulging is completed, wherein the bulging temperature ranges from 820 DEG C to 860 DEG C, the bulging time ranges from 20s to 30s, the pressure holding time ranges from 10s to 11s, and the deflection ranges from 0.7% to 0.9%. The primary rotation is completed by rotating the rolled ring workpiece along the center axis by 45 degrees. The secondary bulging is completed by processes of the primary bulging, wherein the bulging temperature ranges from 790 DEG C to 830 DEG C, the bulging time ranges from 20s to 30s, the pressure holding time ranges from 16s to 18s, and the deflection ranges from 0.8% to 1 %. The second rotation is completed by rotating the ring workpiece again along the direction the same with that of the primary rotation. The tertiary bulging is completed by the processes of the primary bulging again, wherein the bulging temperature ranges from 760 DEG C to 800 DEG C, the bulging time ranges from 30s to 40s, the pressure holding time ranges from 25s to 28s, and the deflection ranges from 0.9% to 1.1%. The dimensional precision of the rolled ring workpiece can be 1%. to 2%. of the corresponding precision after the rolled ring workpiece is bulged, and the rolled ring workpiece is mainly used for the fields of space navigation and the like.

Description

Technical field [0001] The invention relates to a bulging method of ring parts, in particular to a thermal bulging method of high-temperature alloy special-shaped ring rolling parts. Background technique [0002] After the high-temperature alloy special-shaped ring-rolled parts (referring to the ring-rolled parts with a non-rectangular cross-section in the longitudinal section) are rolled by the ring rolling mill, due to the limitations of the rolling process and equipment, the dimensional accuracy is generally not high; only in the special-shaped ring-rolled parts In the case of ideal shape and excellent equipment performance, its dimensional accuracy can reach 3‰~5‰ (three thousandths to five thousandths) of the corresponding size, and the special-shaped ring-rolled parts after rolling are due to greater stress , In the subsequent processing process, if the control is not good, it is easy to cause defects such as warpage, deformation and even cracking. [0003] The Chinese inven...

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 rectangular ring, it can only be suitable for some materials with small deformation resistance. Its main function is to strengthen the ring. Materials such as high-temperature alloys and special-shaped rings 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, the method It cannot solve the problem of low dimensional accuracy of special-shaped ring rolling pieces in the prior art

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