Hot bulging forming method for bearing steel rectangular cross-section ring unit

Abstract

The invention discloses a hot bulging forming method for a bearing steel rectangular cross-section ring unit. The hot bulging forming method comprises the following steps of fixing a preheated die sleeve on a worktable of a bulging machine, then, sleeving the periphery of a preheated bulging block in the bulging machine with the preheated bearing steel rectangular cross-section ring unit, and enabling the bearing steel rectangular cross-section ring unit to locate in an annular space formed by encircling the outer circumferential surface of the bulging block and the inner ring surface of the die sleeve; starting the bulging machine to enable the bulging block to extrude the ring unit along a radial direction from the inner circumferential surface of the ring unit and extruding into the inner ring surface of the die sleeve after the ring unit is deformed by 9-11 percent to fill a closed mold cavity formed by encircling the outer circumferential surface of the bulging block and the inner ring surface of the die sleeve, and retaining the pressure of the ring unit to enable the ring unit to become the bulged rectangular cross-section ring unit. According to the method, by adopting one-time large-deformation bulging forming, the operation is simplified, and the bulged rectangular cross-section ring unit which is high in dimensional accuracy, good in product quality and high in production rate is obtained. The bulged rectangular cross-section ring unit is mainly used for revolved body parts used in the fields of wind power generation 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 bearing 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] Bearing steel rectangular cross-section ring parts (referring to ring parts with a rectangular cross-section in the longitudinal section) are generally not high in dimensional accuracy due to the influence of the rolling process and equipment limitations after ...

AI Technical Summary

Problems solved by technology

The method adopts the open bulging method to bulge and form the bearing steel rectangular cross-section annular member, which has the following problems: first, only the inner diameter of the annular member can reach 1‰~2‰ of the inner diameter, for the annular 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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