CN102069174A - Method for producing centrifugal electroslag smelting and casting double-base composite roller - Google Patents

Abstract

The invention discloses a method for producing a centrifugal electroslag smelting and casting double-base composite roller, which is characterized by comprising the following steps: (1) preparing slag liquid, namely melting 55 to 65 percent of calcium fluoride, 25 to 35 percent of aluminum oxide and 5 to 15 percent of magnesium oxide in a furnace to obtain slag liquid, and melting metal iron to cast a consumable electrode; (2) pouring the slag liquid into the furnace, smelting the electroslag by melting the consumable electrode gradually into molten iron, allowing the molten iron to enter the furnace, and obtaining mixed liquid of slag and iron; (3), injecting the mixed liquid of slag and iron into a quantitative pouring ladle to perform smelting treatment, and injecting the mixed liquid of slag and iron into a centrifugal smelting machine to fill the mixed liquid of slag and iron into a mold and cure the mixed liquid of slag and iron under a centrifugal force to obtain a roller shell blank; and (4) clearing the slag on the inner surface of the roller shell blank, performing core filling treatment on the roller shell with molten iron, and obtaining the centrifugal electroslag smelting and casting double-base composite roller. The roller produced by the invention has high quality.

Description

A kind of production method of centrifugal electroslag smelting casting double-basis composite roll

Technical field

The present invention relates to a kind of production method of roll, especially a kind of production method of centrifugal electroslag smelting casting composite roll.

Background technology

The medium and small roll annual production of China is in nearly 80 families that have more than 3000 tons, these enterprises all adopt the mode of well-established law casting and centrifugal casting to produce roll, on manufacture and content, be in the level of " equal to each other " mostly, product begins to form market harmful competition situation already, however, the production average profit of medium and small roll still can maintain on 10%～35% the basis, and this respect drop mainly is embodied on the height of raw-material supply channel and roll product percent of pass.

In order to satisfy heavy industry, equipment manufacture needs to maximization, high efficiency and the development of product stabilized form, the steel industry Metallurgical Enterprise wishes that urgently mechanical property, the serviceability of roll can obtain further to improve, and the quality of breaker roll product, class, quality stability, reliability and security have proposed more strict requirement.Therefore, the research institution of home and abroad, manufacturer have all dropped into great amount of manpower and material resources in this respect, to seek technological innovation, seek more high-quality roll product and come out.

Centrifugal casting is that molten metal is passed through to inject centrifugal casting machine, and its centrifugal action lower charging type in rotation is at a high speed solidified, with its dense structure of centre spinning forming rolls.

Electroslag smelting casting is that electroslag is separated out heat (slag thermal resistance) by consutrode and fusing slag bath, and consutrode is melted gradually, and liquation pools and drips, and falls into metal bath by slag bath and obtains refining.Because steel, slag reaction temperature height (1700～1900 ℃), steel, slag fully contact, and refining process is strengthened in steel, the vibration of slag interface capillary, and the slag bath strong agitation, make that non-metallic inclusion is slag absorption and fusion in the molten steel.By physical-chemical reaction, pernicious gas in the molten steel (O, N, H) and harmful element (S, P, Pb, Bi, Sn) are fully removed.

At present, centrifugal casting and electroslag smelting casting have been widely used in roll produces, but because the difference of melt cinder composition, the roller performance of producing is different, and quality is all not ideal enough.

Summary of the invention

The present invention just provides a kind of roll quality, class, roll that quality is higher.

The technical solution used in the present invention is: a kind of production method of centrifugal electroslag smelting casting double-basis composite roll is characterized in that it may further comprise the steps:

(1), preparation slag liquid, get the calcirm-fluoride of (55-65) % and (25-35) % alundum (Al and (5-15) magnesia of % place fusing slagging liquid in the stove, get metallic iron and cast with the fusing back and make consutrode;

(2), slag liquid is poured in the stove, adopt the fusing consutrode to carry out electroslag melting, make consutrode be fused into iron liquid gradually and enter in the stove, slag iron mixed liquor;

(3), slag iron mixed liquor is injected quantitative pouring ladle and carry out the metallurgy processing; Slag iron mixed liquor is injected centrifugal casting machine fill type and solidifying under centrifugal force, must body of roll housing blank;

(4) behind the cleaning body of roll housing blank inner surface slag thing, fill out core with iron liquid breaker roll body of roll housing and handle, get centrifugal electroslag smelting casting double-basis composite roll.

Adopt technique scheme, the slag body that is formed by calcirm-fluoride, magnesia and alundum (Al fusing back can be removed the gaseous impurity in the molten iron, can be incubated molten iron again simultaneously, it is more reasonable to remove cast the once more performance of the product that obtains of molten iron behind the impurity.

The invention has the beneficial effects as follows: various types of roll internal structures that the present invention casting obtains are not found segregation phenomena, and the non-metallic inclusion in the metal is disperse, is spherical basically, and distributes very evenly on the whole volume of foundry goods.Therefore the performance of roll is good, and quality is higher.

The specific embodiment

A kind of production method of centrifugal electroslag smelting casting double-basis composite roll, it may further comprise the steps:

(1), preparation slag liquid, get the alundum (Al of 60% calcirm-fluoride and 30% and 10% magnesia and place fusing slagging liquid in the coreless induction furnace, get metallic iron and make the fusing consutrode with coreless induction furnace fusing back casting;

(2), slag liquid is poured in the electroslag graphite crucible stove, make consutrode be fused into iron liquid gradually and enter in the stove, slag iron mixed liquor;

(3), the slag iron mixed liquor in the graphite crucible stove is injected quantitative pouring ladle and carry out the metallurgy processing; With quantitative pouring ladle slag iron mixed liquor is injected centrifugal casting machine and fill type and solidifying under centrifugal force, must body of roll housing blank;

(4) table and behind the slag thing in the cleaning body of roll housing blank is filled out core with iron liquid to body of roll housing blank and is handled, and gets centrifugal electroslag smelting casting double-basis composite roll.

Filling out core handles and can adopt different metallic iron liquid to fill out core and handle according to different needs.

Claims (1)

1. the production method of a centrifugal electroslag smelting casting double-basis composite roll is characterized in that it may further comprise the steps:

(1), preparation slag liquid, get the calcirm-fluoride of (55-65) % and (25-35) % alundum (Al and (5-15) magnesia of % place fusing slagging liquid in the stove, get metallic iron and cast with the fusing back and make consutrode;

(2), slag liquid is poured in the stove, adopt the fusing consutrode to carry out electroslag melting, make consutrode be fused into iron liquid gradually and enter in the stove, slag iron mixed liquor;

(3), slag iron mixed liquor is injected quantitative pouring ladle and carry out the metallurgy processing; Slag iron mixed liquor is injected centrifugal casting machine fill type and solidifying under centrifugal force, must body of roll housing blank;

(4) behind the cleaning body of roll housing blank inner surface slag thing, fill out core with iron liquid breaker roll body of roll housing and handle, get centrifugal electroslag smelting casting double-basis composite roll.