Centrifugal-casting bi-metal special-shaped ring part thermal ring rolling forming method

Abstract

The invention provides a centrifugal-casting bi-metal special-shaped ring part thermal ring rolling forming method, and belongs to the technical field of ring part machining. The centrifugal-casting bi-metal special-shaped ring part thermal ring rolling forming method is characterized by comprising the following technological steps that (1) the ring rolling ratio K and the size of a ring blank are calculated according to the size of a bi-metal special-shaped ring forged piece; (2) ring rolling hole design is conducted, wherein closed hole ring rolling is adopted, a driving roller is a cylindrical roller with an outer step in the middle, a core roller is a roller with an upper outer step and a lower outer step in the middle, a conical cylinder surface is arranged between the upper outer step and the lower outer step, and the outer step surface of the driving roller and the outer step surface of the core roller are tangent, so that a ring rolling forming cavity is formed; and (3) ring rolling forming machining is conducted, wherein the bi-metal ring blank which is formed through centrifugal casting and equipped with an inner layer made of metal Q345B and an outer layer made of metal 40Cr is heated, the initial temperature of the inner layer, the initial temperature of the outer layer of the ring blank, the rotating speed of the driving roller and the variable-speed feeding speed of the core roller are determined, and ring rolling is finished when the temperature of the inner layer is reduced to range from 820 DEG C to 850 DEG C. The centrifugal-casting bi-metal special-shaped ring part thermal ring rolling forming method has the advantages that the equipment investment is low, energy and materials are saved, and the combination strength of interfaces of an inner layer and an outer layer of a bi-metal special-shaped ring part is high. The drawing 1 is an abstract drawing.

Description

technical field [0001] The invention belongs to the technical field of ring processing, and in particular relates to a hot rolling and expanding forming method for a centrifugally cast bimetal special-shaped ring. Background technique [0002] Bimetal special-shaped rings refer to special-shaped rings with different materials on the outer surface or inner surface and irregular cross-sectional shapes. figure 1 The inner layer N and the outer layer W of the ring shown are made of different materials, and the inner surface of the inner layer of the ring has a slope and a complex shape, and its physical, chemical and mechanical properties are much superior to those of a single metal ring. It has become a substitute product for precious single metal rings, and has been widely used in petrochemical, energy, aerospace and other industrial fields with harsh service conditions. The key basic parts such as double-sided roller bodies, concrete mixer truck support guide rails, double-s...

AI Technical Summary

Problems solved by technology

The disadvantage of the above method is that the circumferential metal fiber streamline in the inner layer of the ring will be damaged during the cutting process, the structure performance will deteriorate, and its service life will be seriously reduced; and, in the current production method, it is difficult to make a billet before rolling. The forging and punching process requires a large investment in equipment, serious waste of materials and energy, and low production efficiency

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