Method for producing wear-resistant composite roller

A manufacturing method and technology of composite rolls, which are applied in the field of roll manufacturing, can solve problems such as low strength of the roll core, easy occurrence of slag inclusions in the joint layer of the roll core and the roll body, and roll peeling, so as to achieve good wear resistance of the roll and improve the joint layer quality, anti-oxidation effect

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above methods can solve the problem of low strength of the roll center during the pouring process of large centrifugal composite rolls, slag inclusions are prone to occur in the bonding layer between the roll center and the roll body, and the rolls are prone to peeling accidents during use.

Method used

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  • Method for producing wear-resistant composite roller
  • Method for producing wear-resistant composite roller

Examples

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Effect test

Embodiment 1

[0024] The centrifugal casting method is used to cast φ650mm×1700mm high-speed steel composite roll, the outer layer of the roll is high-speed steel, and the roll center and roll neck are ductile iron. First, the high-speed steel and the ductile iron are smelted separately in an electric furnace. Then pour the wear-resistant outer layer high-speed steel metal liquid of the composite roll into the cold type (8) installed on the horizontal centrifuge. After the roll outer layer high-speed steel metal liquid has been poured, add 300 ℃ baked steel into the cold type Glass slag (7), the composition (mass fraction) of glass slag is 42.5% SiO 2 , 41.8% Na 2 O, 9.5% B 2 o 3 and 6.2% Al 2 o 3 , the amount added is controlled at 2.0kg / m 2 (the inner surface of the wear-resistant outer layer of the roll), which evenly covers the inner surface of the outer layer of the roll under the action of centrifugal force. After the outer layer of high-speed steel liquid is solidified, the ce...

Embodiment 2

[0026] The centrifugal casting method is used to cast φ730mm×2600mm high-nickel-chromium cast iron composite roll. The outer layer of the roll is high-nickel-chromium cast iron, and the roll center and roll neck are nodular cast iron. First use electric furnace to smelt high-nickel-chromium cast iron and nodular cast iron respectively. Then pour the wear-resistant outer layer high-nickel-chromium cast iron metal liquid of the composite roll into the cold mold (8) installed on the horizontal centrifuge. The glass slag (7) baked at ℃, the composition (mass fraction) of the glass slag is 51.3% SiO 2 , 33.1% Na 2 O, 7.6% B 2 o 3 and 8.00% Al 2 o 3 , the amount added is controlled at 2.5kg / m 2 (the inner surface of the wear-resistant outer layer of the roll), which evenly covers the inner surface of the outer layer of the roll under the action of centrifugal force. After the outer layer of high-nickel-chromium cast iron liquid is solidified, the centrifugal cold form is hois...

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Abstract

The invention discloses a method for producing a large-scale wear-resistant composite roller, comprising the following steps: casting wear-resistant outer layer high alloy metal liquid of the wear-resistant composite roll in a cold mould arranged on a horizontal centrifuge; adding glass slag to the cold mould; after the wear-resistant outer layer high alloy metal liquid being solidified, hanging the centrifugal coal mould and assembling the centrifugal coal mould together with a roller neck and pouring box casting mould, a bottom box casting mould and casting pipes; rapidly casting molten iron to the centers of the upper ends of the casting pipes which are arranged vertically in the centers of both the roller neck and pouring box casting mould and the bottom box casting mould firstly at the speed of 60-80 kg/s by controlling the temperature at 1330-1400 DEG C and then at the speed of 15-30 kg/s after the molten iron entering the roller neck and pouring box casting mould; stopping casting the molten iron after the roller neck and pouring box casting mould being filled with the molten iron, and leaving the casting pipes in the center of a wear-resistant composite roller; cooling the wear-resistant composite roller to the room temperature; opening boxes to clean the wear-resistant composite roller blank; roughly processing the wear-resistant composite roller, and quenching and tempering the wear-resistant composite roller; and fine processing the wear-resistant composite roller until the wear-resistant composite roller having the required size and precision. The wear-resistant composite roller has high strength and good use effect.

Description

technical field [0001] The invention relates to a method for manufacturing a composite roll, in particular to a method for manufacturing a large-scale wear-resistant composite roll with a roll body diameter greater than 500mm, and belongs to the technical field of roll manufacturing. technical background [0002] Composite casting roll refers to the composite casting of the outer layer, the core and the roll neck of the roll body, which are made of two or more materials. performance. There are three types of roll compound casting methods: semi-flush compound casting, centrifugal compound casting and overflow compound casting. Centrifugal cladding is widely used in the casting production of large clad rolls because it is easy to achieve good metallurgical bonding between the roll body and the core and is easy to operate. Centrifugal casting composite roll technology has three forms: vertical centrifuge casting method, horizontal centrifuge casting method and inclined centri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16B22D13/02
Inventor 符寒光雷永平侯建强
Owner BEIJING UNIV OF TECH
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