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Equipment and method for preparing roller

A roll and equipment technology, applied in the field of roll preparation equipment, can solve the problems of roll layer structure segregation, coarse eutectic carbide, loose structure, etc., and achieve the effect of improving coarse structure, uniform solidified structure, and reducing porosity

Active Publication Date: 2022-05-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the manufacturing methods of rolls mainly include the following types, namely: centrifugal casting method, spray forming, continuous casting outer layer forming, hot isostatic pressing and rotary electroslag casting method. The above methods are widely used in mass industrial production. Centrifugal casting method, however, the structure segregation of the rolling layer formed by centrifugal casting method is serious, with coarse eutectic carbide
Spray forming is a rapid solidification technology, which utilizes refined liquid metal, which is atomized into a droplet jet, so that semi-solidified particles are deposited on the roller core, and rapid solidification realizes the refinement of the metal structure, uniform composition, and eliminates macro segregation , but this method is easy to cause tissue loosening, and there are obvious pores

Method used

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  • Equipment and method for preparing roller
  • Equipment and method for preparing roller
  • Equipment and method for preparing roller

Examples

Experimental program
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Effect test

preparation example Construction

[0034]When the equipment 10 for preparing rolls in the embodiment of the present application is in use, the rotating mechanism 12 drives the mandrel 11 to rotate around the axis of rotation, and the translation mechanism 13 drives the rotating mechanism 12 and the mandrel 11 to move linearly along the extension direction of the axis of rotation synchronously. Simultaneously, the injection mechanism 14 sprays the molten metal from the injection port 1421 onto the surface of the mandrel 11. During the rotation and translation of the mandrel 11, the molten metal can be evenly distributed on the surface of the mandrel 11, and the cooling mechanism 15 The metal on the surface of the injection mandrel 11 is cooled and solidified to form a roll. Wherein, when the equipment 10 for preparing rolls in the embodiment of the present application is in use, the molten pool is limited between the bottom surface of the nozzle 142 and the mandrel 11, and the bottom surface of the nozzle 142 act...

Embodiment 1

[0059] This embodiment provides a method for preparing rolls, which utilizes the equipment 10 for preparing rolls in the embodiment of the present application to prepare rolls, including the following steps:

[0060]Vacuumize the vacuum chamber 18 and feed inert gas into the crucible 141 with molten metal so that the pressure in the crucible 141 is 0.15 MPa higher than the pressure in the vacuum chamber 18; wherein the molten metal The insulation temperature is 1530°C.

[0061] Preheat the mandrel to a temperature of 1080°C, drive the mandrel 11 to rotate around the rotation axis at a speed of 120 r / min through the rotation mechanism 12, and at the same time, the translation mechanism 13 drives the rotation mechanism 12, and the mandrel 11 rotates at a speed of 12 cm along the extension direction of the rotation axis. / min speed linear motion, lifting mechanism 17 drives translation mechanism 13, rotation mechanism 12 and mandrel 11 to descend with the speed of 10mm / min; Where...

Embodiment 2

[0066] This embodiment provides a method for preparing rolls. The only difference from Embodiment 1 is that the composition of the metal melt in this embodiment is high-speed steel-2, and the rotation speed of the mandrel 11 is 100r / min. 11. The speed of linear motion along the extension direction of the rotation axis is 10cm / min. The holding temperature of the metal melt is 1510°C.

[0067] The carbides in the outer layer of the roll prepared in this example are evenly distributed, and no obvious network carbides are seen. The tissue is dense, and no pores visible to the naked eye are found. Among them, the average grain size of carbides is 8 μm, along the radial direction of the roll, the hardness of the outer layer of the roll fluctuates little, and the change trend is the same as that of Example 1, and the microhardness is maintained at 800-850HV.

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Abstract

The invention provides equipment and a method for preparing a roller, and relates to the technical field of roller preparation. The equipment for preparing the roller comprises a mandrel, a rotating mechanism, a translation mechanism, an injection mechanism and a cooling mechanism, the mandrel is transversely arranged, and the rotating mechanism is configured to be used for driving the mandrel to rotate around a rotating axis; the translation mechanism is configured to be used for driving the rotating mechanism and the mandrel to do synchronous reciprocating rectilinear motion in the extending direction of the rotating axis; the spraying mechanism is provided with a spraying opening used for spraying metal melt to the surface of the mandrel in a plane flow mode, the spraying direction of the metal melt points to the roller face of the mandrel, the distance between the spraying opening and the roller face of the mandrel in the spraying direction ranges from 5 mm to 10 mm, the included angle between the spraying direction and the vertical direction ranges from 0 degree to 30 degrees, and the diameter of the mandrel ranges from 80 mm to 140 mm; the cooling mechanism is configured to be used for cooling and solidifying the metal melt sprayed to the surface of the mandrel. The technical problems that in the prior art, tissue is thick and large, and pores are obvious can be solved.

Description

technical field [0001] The present application relates to the technical field of roll preparation, in particular, to an equipment and method for preparing rolls. Background technique [0002] At present, the manufacturing methods of rolls mainly include the following types, namely: centrifugal casting method, spray forming, continuous casting outer layer forming, hot isostatic pressing and rotary electroslag casting method. The above methods are widely used in mass industrial production. Centrifugal casting method, however, the structure segregation of the rolling layer formed by centrifugal casting method is serious, with coarse eutectic carbides. Spray forming is a rapid solidification technology, which utilizes refined liquid metal, which is atomized into a droplet jet, so that semi-solidified particles are deposited on the roller core, and the rapid solidification realizes the refinement of the metal structure, uniform composition, and eliminates macro segregation , but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115B22F7/08
CPCB22F3/115B22F7/08
Inventor 张佼王玉杰姜海涛孙宝德
Owner SHANGHAI JIAO TONG UNIV
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