Method for forming irregular section ring unit by using high-temperature alloy rectangular section ring unit in thermal-bulging mode

Abstract

The invention discloses a method for forming an irregular section ring unit by using a high-temperature alloy rectangular section ring unit in a thermal-bulging mode. The method includes the steps that 1, a preheated die sleeve is fixed to a work table of a bulging machine, the heated high-temperature alloy rectangular section ring unit is arranged on the periphery of a preheated bulging block in the bulging machine in a sleeved mode, and the heated high-temperature alloy rectangular section ring unit is located in an annular space formed by enclosure of the outer circumference face of the bulging block and the inner ring face of the die sleeve; 2, the bulging machine is started, the ring unit can be extruded by the bulging block from the inner circumference surface of the ring unit in the radial direction and extruded into the inner ring face of the die sleeve after the ring unit deforms by 12%-15%, a closed cavity formed by enclosure of the outer circumference face of the bulging block and the inner ring face of the die sleeve is full of the ring unit, and the ring unit becomes the irregular section ring unit after pressure maintaining. According to the method, bulging forming is achieved by one-shot large deformation, operation is simplified, and the bulged irregular section ring unit which is high in size accuracy, good in product quality and high in productivity can be obtained. The irregular section ring unit is mainly applied to revolved body components and parts like cylindrical shells in the fields like aerospace.

Description

technical field [0001] The invention relates to a ring bulging method, in particular to a method for thermally expanding a ring with a rectangular cross-section of a high-temperature alloy to form a ring with a special-shaped cross-section. 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] High-temperature 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 longitudina...

AI Technical Summary

Problems solved by technology

The method adopts the open bulging method to bulge and form the high-temperature alloy special-shaped cross-section ring, which has the following problems: first, only the inner diameter of the ring can reach 1‰ to 2‰ of the inner diameter. For the ring 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. Second, in the process of using this method to bulge a 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 It is thinned by bulging first, and the metal flows from its lower half to its upper half. If the control is not good, it will easily cause too much metal accumulation in the upper half, so that the wall thickness of the special-shaped cross-section ring part formed by bulging is uneven, and it will cause abnormal shape in severe cases. The upper half of the cross-section ring produces defects such as bulges and is scrapped; the third, the method bulges the rectangular cross-section ring into a special-shaped cross-section ring through one large deformation bulging and three consecutive small deformation bulgings, and three rotations. Secondary bulging 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, there is no It is beneficial to control 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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