Method for thermal expansion of aluminum alloy rectangular cross-section ring to form special-shaped cross-section ring

Abstract

The invention discloses a method for forming a deformed section ring piece through rectangular aluminum alloy section ring piece thermal expansion. The method comprises the steps that a preheated die sleeve is fixed to a workbench of an expanding machine, and the heated aluminum alloy section ring piece is then arranged on the periphery of a preheated expanded block in the expanding machine in a sleeved mode, and is located in ring space defined by the outer circumferential surface of the expanded block and the inner ring surface of the die sleeve; the expanding machine is started to ensure that the expanded block squeezes the ring piece from the inner circumferential surface of the ring piece in the radial direction, after deforming by 13% to 15%, 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 expanded 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 deformed 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 ring bulging method, in particular to a method for thermally expanding an aluminum alloy rectangular cross-section ring to form a special-shaped cross-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 a rectangular longitudinal section) or special-shaped rings (referring to a ring with a non-rectangular longitudinal section) are rolled by a ring ro...

AI Technical Summary

Problems solved by technology

This method adopts an open bulging method to bulge a rectangular cross-section ring into a special-shaped cross-section ring through one large deformation bulging, three consecutive small deformation bulging, and three rotations. Each bulging must be adjusted and controlled by a large number of The process parameters can only be realized, the process is relatively cumbersome, the prod

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