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Centrifugal ceramic composite vertical mill roller sleeve and manufacturing method thereof

A vertical mill roller sleeve and ceramic composite technology, which is applied in the field of roller sleeve and its manufacturing, can solve the problems of failure to repair again, cracking of the roll sleeve, etc., and achieve the effect of good bonding state, avoiding falling off, high strength and toughness

Inactive Publication Date: 2016-05-04
河北津西钢铁集团重工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the vertical mill roller sleeves in China are made of alloy casting and surfacing welding. During daily use and later repairs, due to defects in process materials and base metals, it is easy to cause abnormal damage such as overall cracking of the roller sleeves, which cannot be repaired again. make repairs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The centrifugal ceramic composite vertical mill roll sleeve is prepared by the following process.

[0029] (1) Melting outer layer material process: the chemical composition weight percentage of outer layer high chromium cast iron is: C2.6%, Si0.6%, Mn0.9%, Cr19%, Ni0.9%, Mo1.8%, P0 .02%, S0.01%, the balance is Fe and unavoidable impurities.

[0030] (2) Process of melting the inner layer material: the chemical composition weight percentage of the inner layer ductile iron material is: C3.7%, Si2.6%, Mn0.4%, P0.01%, S0.01%, and the balance is Fe and unavoidable impurities.

[0031] (3) Centrifugal pouring process: The centrifuge rotates at 450rpm, and ceramic particles are fixed in the mold cavity; the outer layer of molten steel is poured when the mold temperature is 200°C, and 80% of the outer layer of molten steel is poured into the mold, followed by subsequent molten steel Evenly add the preheated mold slag; the pouring of the outer layer of molten st...

Embodiment 2

[0034] Embodiment 2: The centrifugal ceramic composite vertical mill roll sleeve is prepared by the following process.

[0035] (1) Melting outer layer material process: the chemical composition weight percentage of outer layer high chromium cast iron is: C2.5%, Si0.7%, Mn0.8%, Cr20%, Ni1.1%, Mo1.9%, P0 .02%, S0.02%, the balance is Fe and unavoidable impurities.

[0036] (2) Process of melting the inner layer material: the chemical composition weight percentage of the inner layer ductile iron material is: C3.8%, Si3.0%, Mn0.5%, P0.01%, S0.02%, and the balance is Fe and unavoidable impurities.

[0037] (3) Centrifugal pouring process: the centrifuge speed is 500rpm, ceramic particles are fixed in the mold cavity; the outer layer of molten steel is poured when the mold temperature is 180°C, and 75% of the outer layer of molten steel is poured into the mold, followed by subsequent molten steel Evenly add the preheated mold slag; the pouring of the outer layer of molten steel is...

Embodiment 3

[0040] Embodiment 3: The centrifugal ceramic composite vertical mill roll sleeve is prepared by the following process.

[0041] (1) Melting outer layer material process: the chemical composition weight percentage of outer layer high chromium cast iron is: C2.8%, Si0.9%, Mn0.9%, Cr22%, Ni1.3%, Mo2.2%, P0 .01%, S0.03%, the balance is Fe and unavoidable impurities.

[0042] (2) Melting inner layer material process: The chemical composition weight percentage of the inner layer ductile iron material is: C3.7%, Si2.8%, Mn0.5%, P0.02%, S≤0.01%, the balance is Fe and unavoidable impurities.

[0043] (3) Centrifugal pouring process: the centrifuge rotates at 420rpm, ceramic particles are fixed in the mold cavity; the outer layer of molten steel is poured when the mold temperature is 150°C, and 78% of the outer layer of molten steel is poured into the mold, followed by subsequent molten steel Evenly add the preheated mold slag; the pouring of the outer layer of molten steel is complet...

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Abstract

The invention discloses a centrifugal ceramic composite vertical mill roller sleeve and a manufacturing method thereof. The centrifugal ceramic composite vertical mill roller sleeve comprises an inner layer and an outer layer. The outer layer is high-chromium cast iron, and ceramic particles are embedded in the outer layer. The high-chromium cast iron is prepared from, by weight, 2.3-3.3% of C, 0.3-1.0% of Si, 0.6-1.2% of Mn, 18-22% of Cr, 0.7-1.7% of Ni, 1.5-3.0% of Mo, 0-0.03% of P, 0-0.03% of S and the balance Fe and inevitable impurities. According to the vertical mill roller sleeve, the material proportion of the inner layer and the outer layer is optimized; high-alloy elements are adopted by the outer layer, the matrix can be effectively reinforced by increasing the content of alloy such as C, Cr, Mo and V, the total amount of carbide is increased, and therefore the smoothness of a friction surface can be effectively improved; the outer layer of the roller sleeve is made to be high in abrasion resistance, high in strength and enough in toughness, and the service life of the roller sleeve is effectively prolonged. According to the manufacturing method, a heat treatment technique of annealing, quenching and tempering is adopted, the purposes of improving the carbide form, promoting structural transformation and refining structures are achieved, so that the abrasion resistance and fracture toughness of the roller sleeve are improved.

Description

technical field [0001] The invention relates to a roller cover and a manufacturing method thereof, in particular to a centrifugal ceramic composite vertical mill roller cover and a manufacturing method thereof. Background technique [0002] At present, most of the vertical mill roller sleeves in China are made of alloy casting and surfacing welding. During daily use and later repairs, due to defects in process materials and base metals, it is easy to cause abnormal damage such as overall cracking of the roller sleeves, which cannot be repaired again. Make repairs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a centrifugal ceramic composite vertical mill roller sleeve with high wear resistance, high strength and sufficient toughness; the invention also provides a manufacturing method of the centrifugal ceramic composite vertical mill roller sleeve. [0004] In order to solve the above-mentioned technical probl...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/08B22D13/04C21D5/00C21D1/26C21D1/18
CPCC22C37/10B22D13/04C21D1/18C21D1/26C21D5/00C22C37/08
Inventor 李贺军张国芳王盼合赵东升剧小华杜亚军郑海明王雅玲赵玉江谷洋柴丽娜王海波郝庆雨冯志春闫志洋路广潘志军孙建平王立勇王小龙谷建凤李志山李志刚
Owner 河北津西钢铁集团重工科技有限公司
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