Mono-block casting mould system for large-scale cast steel supporting roller and casting method thereof

Abstract

The invention relates to a mono-block casting mould system for a large-scale cast steel supporting roller and a casting method thereof. The system and the method are suitable for mono-block casting of cast steel supporting roller with a weight of 200 tons or more. The system and the method are different from the conventional technology, adopt a bottom-pouring and double-pouring system, a simple and practicable heat-insulation riser technology and a long nozzle after-teeming technology on the basis of a slide roller mould so as to produce a roller which has the advantages of no crack, capability of relieving element segregation, strong ultrasonic detection penetration ability, and excellent mechanical property of the work layer in the roller body; and especially adopts the long nozzle after-teeming technology so as to successfully solve the problems of segregation and cracks in the large-scale cast steel supporting roller neck.

Description

technical field [0001] The invention relates to the integral casting technology of cast steel support rolls, in particular to the integral casting mold system design and casting method of large cast steel support rolls exceeding 200 tons. Background technique [0002] In the past ten years, with the development of high-speed and automatic rolling mills, the requirements for flat shape control have become more and more excellent, and the rolling conditions have become more and more stringent, which has made it more and more important to improve rolling efficiency, reduce rolling costs, and ensure product quality. question. Therefore, the requirements for the performance of the back-up rolls on the rolling mill are getting higher and higher, and the selection of the optimal production method and material of the back-up rolls is the key to manufacturing high-quality back-up rolls. The manufacturing method of backup roll is mainly divided into two methods: forging and casting. ...

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Problems solved by technology

[0004] However, the problems of integrally cast cast steel backup rolls are: 1) Due to the large mass, the weight of the molten steel is heavy, and the casting is difficult; 2) The solidification time of the backup roll is long, and the segregation of chemical elements is difficult to control; 3) The length of the backup roll is too long. Feeding is difficult during the solidification process, and the core of the back-up roll is prone to shrinkage cavities and porosity defects; 4) The axial shrinkage of the back-up roll blank is large, and shrinkage cracks are prone to appear

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