Hot bulging method of superhard aluminum alloy conical rolled ring

Abstract

The invention discloses a hot bulging method of a superhard aluminum alloy conical rolled ring. The hot bulging method comprises the steps of arranging the conical hot-rolled ring on the periphery ofa preheated bulging block in a bulging machine in a sleeved manner, moving a preheated pressing block matched with the bulging block, and pressing the pressing block and the bulging block on the upperend face of the rolled ring; starting the bulging machine, and enabling the bulging block to extrude the rolled ring from the inner conical surface of the rolled ring radially, and meanwhile enablingthe pressing block to axially extrude the rolled ring synchronously so that the rolled ring is subjected to plastic deformation including increase of the inner and outer diameters, reduction of the wall thickness and decrease of the height; reaching the preset size, and finishing the bulging after pressure maintaining, in the bulging process, the bulging temperature is 180-280 DEG C, the bulgingspeed is 0.68-1.68 mm / s, the pressing speed is 0.28-1.28 mm / s, and the pressure maintaining time is 54-94 s; and then rotating the rolled ring around the central axis by 30 degrees, and finishing thesizing after bulge marks formed in the inner conical surface of the rolled ring in the bulging process are bulged flat according to the above operation. The dimensional precision of the bulged rolledring reaches + / -2 mm, and the rolled ring is mainly applied to the field of aerospace and the like.

Description

technical field [0001] The invention relates to a bulging method of a ring, in particular to a thermal bulging method of a superhard aluminum alloy tapered ring rolling piece. Background technique [0002] The tapered ring rolling piece is a special-shaped ring rolling piece with a tapered longitudinal section, which is widely used in aviation, aerospace, gas turbines, special engineering equipment and other industries. Due to the difference in diameter between the upper and lower end surfaces of the tapered ring rolling piece, the difficulty of bulging is increased, and defects are prone to occur if the bulging process is not well controlled. [0003] The Chinese invention patent specification CN102441604A published on May 9, 2012 discloses a thermal expansion method for aluminum alloy special-shaped ring rolling parts. Its inner ring surface is set on the periphery of the outer peripheral surface of the preheated bulging block, and the outer peripheral surface of the bulg...

AI Technical Summary

Problems solved by technology

[0004] When the above method is used to bulge the tapered ring rolled piece of superhard aluminum alloy, due to the difference in diameter between the upper and lower ends of the rolled tapered ring piece, most of the strain during bulging is concentrated on the small end surface of the rolled tapered ring piece After the bulging is completed, a slope will appear on the large end surface of the tapered ring rolling piece from the inner diameter to the outer diameter, and a concave phenomenon will appear in the middle of the inner wall of the tapered ring rolling piece. If the bulging force is too large, it is easy to break the cone The rolling piece of the ring bulges upwards to form a bulging block

That is to say, after the bulging of the tapered ring rolling piece, there will be problems such as warping deformation, inner wall depression, and low dimensional accuracy.

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