Method for casting roller with thick working layer

Abstract

The invention relates to a method for casting a roller with a thick working layer. The working layer of the roller adopts a centrifugal double-layer casting method; and when the inner surface temperature of a first layer of molten iron cast on the working layer of the roller is below a solidifying point, a second layer of molten iron is cast, and then core filling is performed. The inner surface temperature of the first layer of molten iron cast on the working layer of the roller is 10 to 50 DEG C lower than the solidifying point. The thickness ratio of the cast first layer of molten iron andthe cast second layer of molten iron after solidification is (1 / 2-2 / 3):1. Because the inner surface temperature of the first layer is low, and the cast second layer of molten iron can be solidified ina sequential mode, the formation of a hot spot is eliminated, the insufficient thickness of a bonding layer and the generation of waste with poor bonding when core part molten iron is cast are avoided, and good metallurgical bonding is realized.

Description

technical field [0001] The invention relates to the field of manufacturing composite cast iron rolls, in particular to a pouring method for thick working layer rolls. Background technique [0002] The thickness of molten iron in the working layer of commonly used centrifugal rolls is less than 100mm. The thickness of the working layer of the rolls of the E-rolling mill is required to be 180mm. The rolls are produced according to conventional methods. Due to the large thickness of the working layer, in the process of centrifugal casting, the rolls are affected by the external cooling speed and internal cooling rate. The surface cooling speed is faster, but the cooling speed inside the centrifugal working layer is slow, and it is easy to generate heat knots inside the centrifugal working layer. When pouring the molten iron in the core, if the core is filled according to the temperature at which the inner surface can be combined with the core, due to the existence of thermal jo...

AI Technical Summary

Problems solved by technology

When pouring the molten iron in the core, if the core is filled according to the temperature at which the inner surface can be combined with the core, due to the existence of thermal joints inside the centrifugal working layer, the centrifugal layer will be melted too much, resulting in waste products with insufficient thickness of the working layer. When the temperature of the inner surface of the centrifugal layer is low, filling the molten iron in the core will produce poorly bonded waste products