Centrifugal casting composite end cover and method for centrifugal casting composite roll

Abstract

The invention discloses a centrifugal casting mold composite end cover and a method for carrying out composite roll centrifugal casting through the same. The centrifugal casting mold composite end cover comprises a casting mold end cover and an additional end cover. The casting mold end cover and the additional end cover are movably connected through a rotary buckle device composed of screw holes, bolts and protruding clamping openings. The method for carrying out composite roll centrifugal casting through the centrifugal casting mold composite end cover comprises the steps that the centrifugal casting mold composite end cover is installed at the two ends of a metal cast mold, a thickened roll working layer is centrifugally cast, and the roll core portion and neck are statically cast in a mold assembling mode after the additional end cover is dismantled, wherein the specific steps comprise casting sand preparation, casting tool preparation and preheating, metal casting mold coating, liquid metal treatment, working layer centrifugal casting, static casting of the core potion and roll neck, and cooling machining. The centrifugal casting mold composite end cover and the method for carrying out composite roll centrifugal casting through the same have the advantages that installation is easy and convenient, the thickened working layer is formed during centrifugal casting, the roll service life is prolonged, the rejection rate and cost are reduced, and meanwhile casting and machining of the roll core portion and neck are not affected.

Description

technical field [0001] The invention relates to the technical field of centrifugal casting, in particular to a composite end cover of a centrifugal casting mold and a method for centrifugal casting of a composite roll using the same. Background technique [0002] Centrifugal casting can solidify and form castings under the action of centrifugal force, and is widely used in the production of various castings, especially in the production of composite rolls. Ordinary composite rolls refer to rolls composed of a working layer and a core (including the roll neck), and some composite rolls also include a transition layer between the working layer and the core. The composite roll can not only meet the requirements of the rolling mill for the wear resistance and thermal fatigue resistance of the working layer of the roll, but also ensure the strength and toughness of the core and roll neck. The composite roll is used as the main consumption process part in the steel rolling proces...

AI Technical Summary

Problems solved by technology

Under normal circumstances, when the composite roll is used to the scrap limit (that is, the working layer is consumed) or when a large defect occurs, the roll will be scrapped as a whole, and the core part of the roll will be treated as scrap steel, which has a great impact on the rolling cost

[0003] At present, in the composite roller centrifugal casting process, ordinary casting end caps are installed at both ends of the centrifugal casting mold, which only have a sealing effect and can prevent liquid metal from splashing, with a single function

The method of centrifugal casting of compound rolls by using the existing ordinary cast end caps usually produces a relatively thin working layer of the compound rolls, which cannot meet the needs of rolling steel production that requires a thick working layer of the rolls. The consumption of the rolls is accelerated, and the scrap rate increases. The rolling cost is reduced; at the same time, in order to increase the high-temperature wear resistance of the working layer of the composite roll, the above-mentioned casting method adds high-hardness carbide elements and elements to improve the stability of the matrix against tempering in the pouring material of the working layer, which increases the production cost.

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