A Hot Rolling and Expanding Process for Centrifugal Casting Bimetallic Composite Rings

Abstract

The invention relates to a centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology, and belongs to the technical field of ring part rolling expansion machining. The centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology is characterized by comprising the following steps: (1) isothermal heating is carried out; (2) a heated duplex-metal composite ring blank is placed on a radial and axial direction ring rolling machine; (3) the contact relation between a forming roller and the ring blank is determined; (4) a driving roller drives the duplex-metal composite ring blank and a core roller to perform rotation motion, meanwhile, the core roller does straight line feeding motion in the radial direction of the ring blank, an end face taper roller only keeps the rotary motion rather than conducting axial feeding, and continuous local plastic deformation of wall thickness reduction, diameter enlarging and cross section layout shaping is continuously carried out on the duplex-metal composite ring blank; and (5) when a preset value of the outer diameter of a duplex-metal composite ring part is obtained, a guide roller gives out a signal, the core roller stops feeding, and extend-rolling is finished. The centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology has the beneficial effects that the process procedure is shortened, the device investment is reduced, and energy and materials are saved; and meanwhile, the composite ring part interface plastic deformation is sufficient, the bonding strength is high, the mechanical property is good, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of rolling and expanding processing of ring parts, and in particular relates to a hot rolling and expanding forming process of a centrifugally cast bimetal composite ring. Background technique [0002] Bimetal composite rings can maximize the best properties of the inner and outer single metals (such as wear resistance and corrosion resistance), and their physical, chemical and mechanical properties are much superior to those of single metal rings , become a substitute for precious single metal rings, and are widely used in petrochemical, energy, aerospace and other industrial fields with harsh service conditions. [0003] At present, there are two main production methods for bimetallic rings. One is to roll two single metal rings separately through the ring rolling process, and then fit them together to form bimetallic rings. The disadvantage is that the process Many, low efficiency, and poor contact surfa...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main production methods for bimetallic rings. One is to roll two single metal rings separately through the ring rolling process, and then fit them together to form bimetallic rings. The disadvantage is that the process Many, low efficiency, and poor contact surface quality; the other is to assemble two single-metal annular forging billets concentrically, and use a ring rolling machine to produce continuous local plastic deformation with reduced wall thickness and enlarged diameter, and a certain The disadvantages of bimetallic rings with high quality and performance are poor stability in the rolling process, difficulty in making billets before rolling, large investment in equipment, and serious waste of materials. They are only suitable for the production of bimetallic composite rings with small holes and thin walls.

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