Heat bulging forming method for stainless steel rectangular cross section annular elements

Abstract

The invention discloses a heat bulging forming method for stainless steel rectangular cross section annular elements. The method comprises the following steps that a preheated mold sleeve is fixed on a work table of a bulging machine, then, a heated stainless steel rectangular cross section annular element is sheathed on the periphery of a preheated bulging block in the bulging machine so that the heated stainless steel rectangular cross section annular element is positioned in an annular space surrounded by the outer circumference surface of the bulging block and the inner annular surface of the mold sleeve, the bulging machine is started so that the bulging block extrudes the annular element from the inner circumference surface of the annular element in the radial direction, deforms 10 percent to 13 percent, and is then extruded into the inner annular surface of the mold sleeve, a sealed die cavity surrounded by the outer circumference surface of the bulging block and the inner annular surface of the mold sleeve is fully filled, and the bulged rectangular cross section annular element is formed after the pressure preservation. The method adopts one-step large-deformation-quantity bulging forming, the operation is simplified, and the bulged rectangular cross section annular element with high dimension precision, high product quality and high productivity is obtained. The bulged rectangular cross section annular element is mainly used for rotating body parts of tubular casings and the like used in the fields of aeronautics and astronautics and the like.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal expansion forming method for a stainless steel 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] Stainless steel 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 ...

AI Technical Summary

Problems solved by technology

The method adopts the open bulging method to bulge and form the stainless steel rectangular cross-section ring, which has the following problems: first, only the inner diameter of the ring can reach 1‰~2‰ of the inner diameter, for the ring The dimensional accuracy of the outer diameter and height of the ring cannot be achieved, because the dimensional accuracy of the outer diameter and height of the ring is not controlled during the bulging process, and the dimensional accuracy cannot be improved by this bulging method. , that is, the height and outer diameter dimensional accuracy 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 achieved 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. In the actual production process, it is not conducive to controlling product quality. and organize mass production, it is difficult to obtain high-quality, precise, efficient, environmentally friendly and low-cost ring parts

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