Hot-bulging method for hard aluminum alloy tapered ring rolled piece

Abstract

The invention discloses a hot-bulging method for a hard aluminum alloy tapered ring rolled piece. The method comprises the steps that the hot-rolled tapered ring rolled piece is arranged on the peripheries of preheated bulging blocks in a bulging machine in a sleeving manner, preheated pressing blocks are moved to be matched with the bulging blocks and pressed on the upper end face of the ring rolled piece. The bulging machine is started, the bulging blocks squeeze the ring rolled piece from the inner circular conical surface of the ring rolled piece in the radial direction, while the pressingblocks synchronously squeeze the ring rolled piece in the axial direction so that plastic deformation of the ring rolled piece that the inner-outer diameter size is expanded, the wall thickness is reduced, and the height is reduced can be generated, and bulging is completed after the preset size is reached and pressure maintaining is performed; in the bulging process, the bulging temperature is 160-260 DEG C, the bulging speed is 0.66-1.66 mm / s, the pressing-down speed is 0.26-1.26 mm / s, and the pressure maintaining time is 52-92 s; and then, the ring rolled piece is rotated along the centeraxis, and then correction is completed after a bulge mark formed on the inner circular conical surface of the ring rolled piece in the bulging process is bulged flatly according to the above operation. The size precision of the bulged ring rolled piece reaches + / -2 mm, and the hard aluminum alloy tapered ring rolled piece is mainly used for the field of aerospace and the like.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for a tapered hard aluminum alloy rolled ring. 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 bulging block ...

AI Technical Summary

Problems solved by technology

[0004] When the above method is used to bulge the hard aluminum alloy tapered ring rolling piece, due to the difference in diameter between the upper and lower end surfaces of the tapered ring rolling piece, most of the strain during bulging is concentrated on the small end surface of the tapered ring rolling 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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