Thermal expansion forming method of rectangular aluminum alloy section ring piece

Abstract

The invention discloses a thermal expansion forming method of a rectangular aluminum alloy section ring piece. The method comprises the steps that a preheated die sleeve is fixed to a workbench of an expanding machine, the heated rectangular aluminum alloy section ring piece is then arranged on the periphery of a preheated expanding block in the expanding machine in a sleeved mode, and is located in ring space defined by the outer circumferential surface of the expanding block and the inner ring surface of the die sleeve; the expanding machine is started to ensure that the expanding block squeezes the ring piece from the inner circumferential surface of the ring piece in the radial direction, after deforming by 11% to 12%, the ring piece enters the inner ring surface of the die sleeve in a squeezed mode, a sealed cavity defined by the outer circumferential surface of the expanding block and the inner ring surface of the die sleeve is filled with the ring piece, and the ring piece becomes an expanded rectangular section ring piece after pressure holding. Due to the adoption of once large deformation expanding forming, the method simplifies operation and the expanded rectangular section ring piece which is high in size precision, good in quality and high in production rate is acquired. The expanded rectangular section ring piece is mainly used for revolved body parts, like barrel-shaped shells, used in fields like aerospace.

Description

technical field [0001] The invention relates to a bulging method of a ring, in particular to a thermal expansion forming method of an aluminum alloy rectangular section ring. Background technique [0002] In the field of ring forming technology, with the development of aviation, aerospace, shipbuilding, nuclear energy, gas turbines, wind power and other industries, the requirements for high reliability, long life and low cost of ring parts require the forming dimensional accuracy, structure and quality of ring parts. Performance also puts forward higher requirements, and the forming of ring parts is developing in the direction of high quality, precision, high efficiency, environmental protection and low cost. [0003] Aluminum alloy rectangular cross-section rings (referring to rings with rectangular longitudinal cross-sections) are rolled by ring rolling mills. Due to the influence of rolling process and equipment limitations, their dimensional accuracy is generally not hig...

AI Technical Summary

Problems solved by technology

The method adopts the open bulging method to bulge and form the aluminum alloy rectangular cross-section ring, which has the following problems: first, only the inner diameter of the ring can reach 1‰ to 2‰ of the inner diameter. For the ring The dimensional accuracy of the outer diameter and height of the ring part cannot reach this dimensional accuracy, because the dimensional accuracy of the outer diameter and height of the annular part is not controlled during the bulging process, and its size cannot be improved by this bulging method. Accuracy, that is, the height and outer diameter of the ring are basically maintained at the level after ring rolling; second, the method uses three consecutive small deformations and two rotations to bulge the rectangular cross-section ring, each bulging It can only be realized by adjusting and controlling a large number of process parameters. The process is relatively cumbersome, the productivity is low, the energy consumption is large, the production preparation time and production cycle are long, and the requirements for equipment are also high. It is not conducive to controlling the product in the actual production process. Quality and organization mass production, it is difficult to obtain high-quality, precise, efficient, environmentally friendly and low-cost ring parts

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