Method for Thermal Expansion of Stainless Steel Rectangular Cross-section Ring to Form Special-shaped Cross-section Ring

Abstract

The invention discloses a method for forming a deformed section annular part from a stainless steel rectangular section annular part in a thermal expansion mode. The method includes the steps that a die sleeve which is preheated is fixed on a worktable of a bulging machine, the heated stainless steel rectangular section annular part is arranged on the periphery of a preheated bulging block in the bulging machine in a sleeved mode, and therefore the stainless steel rectangular section annular part is located in an annular space defined by the outer circumference face of the bulging block and the inner ring face of the die sleeve; the bulging machine is started so as to enable the bulging block to extrude the annular part in the radial direction from the surface of the inner circumference of the annular part, the annular part is deformed by 11-14 percent and extruded into the inner ring face of the die sleeve, and a closed cavity defined by the outer circumference face of the bulging block and the inner ring face of the die sleeve is filled with the annular part. After the stainless steel rectangular section annular part undergoes pressure maintaining, the deformed section annular part is formed. According to the method, one-time large deformation bulging forming is adopted, operation is simplified, and the bulging deformed section annular part which is high in size precision, good in product quality and high in productivity is obtained. The deformed section annular part is mainly used in revolution body parts such as cylindrical shell bodies which are used in the fields such as aerospace.

Description

Technical field [0001] The invention relates to a bulging method of a ring member, in particular to a method for thermally expanding a stainless steel rectangular section ring member to form a special-shaped section ring member. Background technique [0002] In the field of ring forming technology, with the development of aviation, aerospace, shipbuilding, nuclear energy, gas turbines, wind power generation and other industries, the requirements for high reliability, long life and low cost of ring parts, the forming dimensional accuracy, organization and 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 section ring (referring to the ring with a rectangular cross section in the longitudinal section) or special-shaped section ring (referring to the ring with the longitudinal section of the non-rectangul...

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 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 organizing mass production. It is difficult to obtain high-quality, precise, efficient, environmentally friendly and low-cost ring parts

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