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Preparation method of a super wear-resistant composite roll

A technology of composite rolls and rolls, applied in the directions of rolls, metal rolling, metal rolling, etc., can solve problems such as spalling, and achieve the effect of solving surface stress, saving roll manufacturing resources, and improving utilization rate

Active Publication Date: 2016-08-17
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 of a super wear-resistant composite roll

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preparation example Construction

[0033] A preparation method of a super wear-resistant composite roll of the present invention, the super wear-resistant composite roll is composed of a roll core and a roll working layer or a 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 by surfacing welding process on the core of the roll, and 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 described plate roll comprises the steps:

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

[0036]Step 2) Use the hollow electrode to surfacing the roller core to form a surfacing layer A on the surface of the roller core. The thick...

Embodiment 1

[0049] Such as figure 1 As shown, the preparation method of the plate roll with a diameter of 1200mm

[0050] Step 1) Prepare the core part of the plate roll by casting method, and 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 the hollow electrode is used to surfacing the roller core to form a surfacing layer A 3 on the surface of the roller core, and the thickness of the surfacing layer A is 24mm; the hollow cavity of the hollow electrode is equipped with Composite powder, its composition is: 42CrMo powder, 65 nickel alloy powder, nano tungsten carbide powder, aluminum powder and graphite powder. Its weight percentage is respectively 50%, 20%, 8%, 20% and 2%. The particle size of nano-tungsten carbide is 80 nanometers, the particle size of graphite powder is -325 mesh, and the rest are all powders of -200 mesh.

[0052] Step ...

Embodiment 2

[0056] Such as figure 2 As shown, the preparation method of profile rolls with a diameter of 800mm

[0057] Step 1) Prepare the core of the plate roll by casting method, the material is QT800-2. The core diameter is 795mm. 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 weld the reserved groove 4, fill the reserved groove to form a surfacing layer B 5, and the thickness of the surfacing layer B is 59 mm (that is, it 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 is filled with composite powder, and its composition is: 42CrMo powder, 65 nickel alloy powder, nano-tungsten carbide powder, aluminum powder and graphite powder. Its percentage by weight is respectively 45%, 25%, 12%, 15% and 3%. The par...

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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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Patent Type & Authority Patents(China)
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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