Composite roll mixed with reinforcement cast iron base and manufacture method thereof

Abstract

The invention discloses a hybrid reinforced cast iron-containing compound roll and a preparation method thereof. A compound layer (working layer) of the prepared hybrid reinforced cast iron-containing compound roll is a cast iron-containing composite material which is reinforced by mixing tungsten filaments and carbide particles, and a roll core of the roll is made from high-strength grey cast iron. The preparation method of the compound roll comprises the following steps: the tungsten filament net which is made of the tungsten filaments is pre-arranged in a cast mold of a centrifuge and the number of the arranged layers is 1-4; the high-strength grey cast iron is cast in the cast mold of the centrifuge at certain rotation speed at the temperature of 1300-1350 DEG C; the cast roll is subject to heat treatment, thermal diffusion and phase transition, and cooled in a furnace to the room temperature to obtain the hybrid reinforced cast iron-containing compound roll. The compound layer (the working layer) of the hybrid reinforced cast iron-containing composite roll is in good combination with the roll core. Experiments prove that the hybrid reinforced cast iron-containing compound roll prepared by the method has the advantages of high red hardness, good wear resistance and small internal stress, thus the service life of the roll can be greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to roll manufacturing, in particular to a cast iron-based composite roll reinforced by mixing tungsten wire and carbide particles and a manufacturing method thereof. Background technique [0002] Rolls are the main consumable parts in steel rolling production, and their quality directly affects the efficiency of rolling mills, the quality of rolled materials, and the cost of rolled materials. The development of new rolls to meet the needs of steel rolling production is a subject of constant concern to roll workers. The working condition of the roll requires that the composite layer (working layer) metal has a relatively high hardness and wear resistance, while the inner layer should have a certain strength and toughness. In order to meet this purpose, there are currently two main methods for roll production. [0003] One method is to use a single material centrifugal casting rol...

AI Technical Summary

Problems solved by technology

However, high-speed steel contains more alloying elements such as W, Cr, Mo, V, etc., and the density of these elements and the carbides they form varies greatly. Under ordinary centrifugal casting conditions, alloy elements in high-speed steel rolls segregate seriously, The segregation of the centrifugal casting high-speed steel roll is mainly the segregation of MC carbide, which seriously affects the wear resistance of the roll

At the same time, using a single material to manufacture rolls often consumes a lot of resources

[0004] Another method is to use bimetallic liquid to centrifugally cast composite rolls. At present, there are many patents in this area, but it is difficult to implement, and it is often difficult to control the pouring time and temperature of the two melts. As a result, the quality of the composite rolls is not high, for example The inclusions must not be discharged during pouring, and casting defects are caused by the existence of the bonding part. It is often difficult to achieve excellent metallurgical bonding between the inner and outer layers, resulting in easy cracking during manufacturing and use.

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