Manufacture method of composite milling roller with good roller surface rigidity uniformity

A composite roll with uniform hardness technology, which is applied in the field of roll manufacturing, can solve the problems of low uniformity of roll surface hardness and poor roll surface temperature uniformity, and achieve the effects of good hardness uniformity, long service life and high strength

Inactive Publication Date: 2010-06-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires argon protection arc combustion, the surface temperature uniformity of the roll is poor, and the hardness uniformity of the roll surface is not high.

Method used

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  • Manufacture method of composite milling roller with good roller surface rigidity uniformity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The roll body (3) is made of high-carbon high-vanadium high-speed steel, and the roll neck (1) is made of ductile iron. After annealing and rough machining, the roll is heated in a heating furnace to the critical point A of high-carbon high-vanadium high-speed steel. C1 Above 150°C, after 4 hours of heat preservation, place in the cooling control device (4), the roll body (3) is placed in the cooling control device (4), and the roll neck (1) is placed outside the cooling control device (4), And make the roll rotate at a speed of 35rpm during the cooling process, and at the same time coat the heat insulating material (2) on the roll neck (1) surface, and its thickness is 2mm. The main chemical components (mass fraction, %) of the high-carbon high-vanadium high-speed steel are: 1.78C, 4.63V, 5.04Cr, 2.11Nb, 0.57Ni and 4.89Mo. Insulation material (2) is CaO / SiO with a thermal conductivity of 0.043 (w / m.k) 2 . In the controlled cooling device (4), the composite roll is fi...

Embodiment 2

[0025] The centrifugal casting composite roll whose body (3) is high chromium cast iron and roll neck (1) is nodular cast iron is heated to the critical point A of high chromium cast iron in a heating furnace after annealing and rough machining C1 Above 80°C, after 6 hours of heat preservation, place in the cooling control device (4), the roll body (3) is placed in the cooling control device (4), and the roll neck (1) is placed outside the cooling control device (4), And the roll is rotated at a speed of 25 rpm during the cooling process, and at the same time, the heat insulating material (2) is coated on the surface of the roll neck (1) with a thickness of 4 mm. Among them, the main chemical composition (mass fraction, %) of high chromium cast iron is: 2.89C, 18.61Cr, 1.04Ni, 1.88Mo and 0.17Ti. The thermal insulation material (2) is an asbestos cloth with a thermal conductivity of 0.069 (w / m.k). In the controlled cooling device (4), the composite roll is first sprayed with m...

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Abstract

The invention discloses a manufacture method of a composite milling roller with good roller surface rigidity uniformity, which is characterized in that the method comprises the following steps: firstly, heating the composite milling roller to a temperature 80 to 150 DEG C higher than the critical point AC1 in a heating furnace; placing the composite milling roller into a cold controller after heat preservation; firstly, spraying and cooling the composite milling roller for 5 to 15 minutes; then, cooling the composite milling roller for 20 to 60 minutes by gas; finally, cooling the composite milling roller by air until the roller surface temperature is lower than 300 DEG C; putting the composite milling roller into a furnace for tempering treatment at the tempering heating temperature between 450 and 580 DEG C; cooling the furnace to the temperature lower than 200 DEG C after heat preservation; and cooling the composite milling roller to the room temperature by air. The rigidity of the rolling surface of the composite milling roller of the invention is uniform, the service life is obviously prolonged, and the invention has good economic benefits when being popularized and applied.

Description

technical field [0001] The invention relates to a manufacturing method of a composite roll, in particular to a composite roll with good uniformity of roll surface hardness and a manufacturing method thereof, belonging to the technical field of roll manufacturing. Background technique [0002] Modern metallurgical industrial production is a systematic project integrating mining, mineral processing, sintering, ironmaking, steelmaking and steel rolling. Steel rolling is the last link of this systematic project. Most metallurgical products can only enter the market after rolling. The roll is the most important production tool in the rolling process. The quality of the roll directly affects the output and quality of metallurgical products. The level of a country's roll manufacturing technology directly reflects the level of the country's metallurgical industry. Modern metallurgical rolls have experienced several important processes in the development of materials and manufacturin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/68C21D1/18
Inventor 符寒光雷永平宫开令
Owner BEIJING UNIV OF TECH
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