Determination method for blank dimension of centrifugal casting based bimetal ring piece hot ring rolling

Abstract

The invention provides a determination method for the blank dimension of centrifugal casting based bimetal ring piece hot ring rolling, and belongs to the field of ring piece machining forming design.The determination method is characterized by including the following steps that firstly, only the situation that the wall thickness of the outer layer of a centrifugal casting blank is larger than that of the inner layer of the centrifugal casting blank and the wall thickness of the outer layer of a ring piece forging is larger than that of the inner layer of the ring piece forging is considered,and before and after hot ring rolling, the axial heights are not changed, the wall thicknesses are reduced, and the diameters are increased; secondly, according to the dimension of a bimetal ring piece forging, the relation between the ring rolling ratio of the inner layer and the diameter of the inner and outer layer interface of the ring piece forging and the relation between the ring rolling ratio of the outer layer and the diameter of the inner and outer layer interface of the ring piece forging are determined; thirdly, the relation between the interface diameter of the centrifugal casting blank and the diameter of the inner and outer layer interface of the ring piece forging is determined; fourthly, the relation, within the time interval after centrifugal casting of the outer layer of the blank is completed, between the contraction amount of the outer layer of the blank and the wall thickness of the outer layer of the blank is determined; and fifthly, according to the principle that the volume is not changed before and after hot ring rolling, the dimension of the centrifugal casting blank is determined. The determination method has the beneficial effects that the blank dimension can be easily, conveniently and rapidly determined, the design efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of ring processing and forming design, and in particular relates to a method for determining the size of a hot-rolled and expanded blank of a centrifugally cast bimetallic ring. Background technique [0002] The bimetallic composite ring is a composite ring composed of two different metal materials. The inner and outer materials are tightly combined through mechanical pressing, metallurgical reaction or atomic diffusion, which can maximize the use of the inner and outer single metal The best properties of each (such as high strength, wear resistance, corrosion resistance), its physical, chemical and mechanical properties are much superior to single metal material rings, and gradually become a substitute for precious single metal rings, It has broad application prospects in equipment manufacturing in petrochemical, marine engineering, energy, aerospace and other industrial fields with harsh service conditions. There a...

AI Technical Summary

Problems solved by technology

However, when two single metal rings are separately rolled and expanded, it will lead to many processes and low efficiency. The inner and outer contact surfaces only undergo elastic deformation or small plastic deformation, and there is no diffusion bonding surface, resulting in poor contact interface quality; The stability of the rolling process of the combined rolling and expanding of a single metal ring-shaped forging billet is poor, and it is easy to cause warping of the axial end surface. Combination, low bonding strength, unable to meet the requirements of high-performance bimetallic composite ring manufacturing technology

[0003] According to the Chinese invention patent application number "201410629533.6", a slab-based design method for the radial and axial rolling blank size of the ring is disclosed, and the application number "201510610173.X" discloses a centrifugal casting bimetal composite ring hot rolling expansion method. The forming process and application number "201510610418.9" discloses a centrifugal casting method for the inner layer Q345B outer layer 40Cr composite ring. Problems such as low bonding strength of bimetallic contact interface, serious material waste and low production efficiency

However, in this bimetallic ring manufacturing technology, there are often situations where the inner and outer wall thicknesses are different and the amount of rolling deformation is different, so as to meet the service performance of the bimetallic composite ring with an inner layer that is easy to weld and an outer layer that is wear-resistant. At this time, it is impossible to accurately determine the size of the inner layer and the outer layer of the blank in the centrifugal casting process. If only relying on the production experience in the traditional process, or the principle of constant volume before and after rolling, the size of the blank will be too large. Breaking away from the production reality of the casting process, it increases the production cost, reduces the design and production efficiency, and also causes the unreasonable distribution of the inner and outer layer metals to cause stress concentration at the interface, reducing the metallurgical bonding strength and mechanical properties of the interface

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