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Preparation method for super wear-resistant composite roll

A technology of composite rolls and rolls, which is applied in the direction of rolls, metal rolling, metal rolling, etc., can solve problems such as spalling, and achieve the effects of solving surface stress, reducing consumption per ton of steel, and saving resources in roll manufacturing

Active Publication Date: 2014-04-02
西安奥奈特固体润滑工程学研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is spalling caused by internal cracks, which may be related to the presence of inclusions and bonding layer defects inside the roll. Under the action of rolling force, cracks are generated and expanded to cause spalling

Method used

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  • Preparation method for super wear-resistant composite roll
  • Preparation method for super wear-resistant composite roll

Examples

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preparation example Construction

[0033] The method for preparing a super wear-resistant composite roll of the present invention is composed of a roll core and a roll working layer or roll nest working layer. The roll material core is referred to as the roll core; the roll working layer or roll The nest working layer is prepared on the core of the roll by surfacing welding process, and is hardened by explosive hardening process or laser surface hardening process; the form of the roll is divided into two types: plate roll and profile roll.

[0034] The preparation method of the sheet roll includes the following steps:

[0035] Step 1) Use QT400--QT800-2 nodular cast iron cast plate roll material core, the core diameter is 5mm-50mm smaller than the final nominal diameter of the roll;

[0036] Step 2) Use a hollow electrode to surfacing the roller core to form a surfacing layer A on the surface of the roller core. The thickness of the surfacing layer A is 5-50mm; the hollow cavity of the hollow electrode contains...

Embodiment 1

[0049] Such as figure 1 As shown, the method for preparing a sheet roll with a diameter of 1200mm

[0050] Step 1) Prepare the core of the sheet roll by casting method, the material is QT800-2. The core diameter is 1160 mm. The surface roughness Ra after rough machining is 32um.

[0051] Step 2) The surface of the roller core 1 needs to be heated to 290°C, and a hollow electrode is used to surfacing the roller core to form a surfacing layer A 3 on the surface of the roller core. The thickness of the surfacing layer A is 24mm; the hollow electrode cavity contains Composite powder, its composition is: 42CrMo powder, 65 nickel alloy powder, nano tungsten carbide powder, aluminum powder and graphite powder. The weight percentages are 50%, 20%, 8%, 20% and 2% respectively. The particle size of nano tungsten carbide is 80 nanometers, the particle size of graphite powder is -325 mesh, and the rest are all -200 mesh powder.

[0052] Step 3) Use high-energy directional explosive heat trea...

Embodiment 2

[0056] Such as figure 2 As shown, the method for preparing a profile roll with a diameter of 800mm

[0057] Step 1) Prepare the core of the sheet roll by casting method, the material is QT800-2. The core diameter is 795 mm. The surface roughness Ra after rough machining is 32um. The size of the reserved groove 4 is 50 mm in width and 40 mm in depth, and the distance between each reserved groove is 120 mm.

[0058] Step 2) Use a hollow electrode to surfacing the reserved groove 4, fill the reserved groove to form a surfacing layer B 5, the thickness of the surfacing layer B is 59 mm (that is, 19 mm higher than the surface of the core); Filling the reserved groove is the roller nest; the hollow cavity of the hollow electrode contains composite powder, and its composition is: 42CrMo powder, 65 nickel alloy powder, nano tungsten carbide powder, aluminum powder and graphite powder. The weight percentages are 45%, 25%, 12%, 15% and 3% respectively. The particle size of nano tungs...

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Abstract

The invention relates to a preparation method for a composite roll, in particular to the preparation method for a super wear-resistant composite roll. The super wear-resistant composite roll is manufactured by adopting the composite technology of a surfacing technology of self-fluxing alloy powder with super wear-resistant performance and an explosion hardening process or a laser surface hardening engineering technology. The roll consists of a roll core part and a roll working layer, wherein the roll working layer is prepared on the roll core part by a surfacing process; the roll core part is made of QT400-QT800-2 ductile iron and 235-450 cast steel; the composite material of the surface working layer comprises the following components of 42CrMo powder, 65 nickel alloy powder, nano-tungsten carbide powder, aluminum powder and graphite powder. The surface of the roll manufactured by the composite technology has super wear-resistant performance. Over 80 percent of the materials used by the roll can enter a cyclic remanufacturing process; the manufacturing process has the characteristic of green manufacturing. The forms of rolls comprise sheet rolls and profile rolls.

Description

technical field [0001] The invention relates to a preparation method of a composite roll, in particular to a preparation method of a super wear-resistant composite roll. It belongs to the remanufacturing field of green design of metallurgical machinery and equipment. Background technique [0002] As an important consumable part in the rolling process, the roll will be damaged due to many reasons in the normal rolling process. But the main reason is that the surface stress of the roll, thermal fatigue, impact fatigue, and hardness and hardness homogenization defects lead to the inability to maximize the amount of steel passed, especially the hardness of the roll, which is an important indicator of the mechanical properties of the roll material. Hardness is not the basic performance of materials, but only a practical engineering performance, which is used to perform simple non-destructive evaluation of material strength, heat treatment state or work hardening degree. Accordin...

Claims

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Application Information

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IPC IPC(8): B23P23/04B21B27/00
CPCB21B27/02B23P15/00
Inventor 张军
Owner 西安奥奈特固体润滑工程学研究有限公司
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