Method for forming deformed section annular part from stainless steel rectangular section annular part in a thermal expansion mode

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 ring bulging method, in particular to a method for thermally expanding a stainless steel rectangular cross-section ring to form a special-shaped 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 a rectangular longitudinal section) or special-shaped rings (referring to a ring with a non-rectangular longitudinal section) are rolled by a ring rolling mill, d...

AI Technical Summary

Problems solved by technology

The method adopts the open bulging method to bulge and form the stainless steel ring with special-shaped cross-section. 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. ; Second, in the process of using this method to bulge the rectangular cross-section ring into a special-shaped cross-section ring, because the lower half of the rectangular cross-section ring is first subjected to the bulging force from the bulging block, its lower half first Thinned by bulging, the metal flows from its lower half to its upper half. If the control is not good, it is easy to cause too much metal accumulation in the upper half, so that the wall thickness of the shaped cross-section ring part formed by bulging is uneven, and in severe cases, it will cause a special-shaped cross-section The upper half of the ring is scrapped due to defects such as bulging; third, the method bulges the rectangular cross-section ring into a special-shaped cross-section through one large deformation bulging, three consecutive small deformation bulging, and three rotations. Bulging 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 the actual production process. 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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