Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll

A composite roll, uniform hardness technology, applied in the field of roll manufacturing, can solve the problems of long cycle and low efficiency, and achieve the effect of improving strength and toughness, fast cooling and high hardness

Inactive Publication Date: 2013-07-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after quenching and cooling, the roll of this invention also needs to be tempered, which has a long cycle and low efficiency.

Method used

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  • Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll
  • Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll
  • Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The roll body (3) is made of boron-containing high-speed steel, the roll neck (1) and the roll center (4) are made of nodular cast iron, and is cast into a boron-containing high-speed steel composite roll through centrifugal compound casting. After rough machining, it is heated Heating in the furnace to 1080°C, after 4 hours of heat preservation, place it in the cooling control device (5), and make the roll rotate at a speed of 20rpm during the cooling process, and at the same time coat the heat insulating material (2) on the roll neck (1) surface , and the roll neck (1) is placed outside the cooling device (5). The insulation material (2) is CaO / SiO with a thermal conductivity of 0.043 (w / m.k) 2 , and its thickness is 2mm. Using mist and gas cooler (6), first press the spray quenching process parameter 1 (P 空气 =0.15MPa, P 水 =0.30MPa, Q 水 =1.65m 3 / h) Spray cooling for 6 minutes, then reduce the cooling rate, and switch to spray quenching process parameter 2 (P 空气...

Embodiment 2

[0035] The roll body (3) is made of boron-containing high-speed steel, the roll neck (1) and the roll center (4) are made of nodular cast iron, and is cast into a boron-containing high-speed steel composite roll through centrifugal compound casting. After rough machining, it is heated Heat the furnace to 1060°C, place it in the cooling control device (5) after 6 hours of heat preservation, and make the roll rotate at a speed of 15 rpm during the cooling process, and at the same time coat the heat insulating material (2) on the surface of the roll neck (1) , and the roll neck (1) is placed outside the cooling device (5). The heat insulating material (2) is asbestos cloth with a thermal conductivity of 0.069 (w / m.k), and its thickness is 4mm. Using mist and gas cooler (6), first press the spray quenching process parameter 1 (P 空气 =0.12MPa, P 水 =0.35MPa, Q 水 =1.80m 3 / h) Spray cooling for 5 minutes, then reduce the cooling rate, and switch to spray quenching process parameter...

Embodiment 3

[0037] The roll body (3) is made of boron-containing high-speed steel, the roll neck (1) and the roll center (4) are made of nodular cast iron, and is cast into a boron-containing high-speed steel composite roll through centrifugal compound casting. After rough machining, it is heated Heating in the furnace to 1070°C, after 5 hours of heat preservation, place it in the cooling control device (5), and make the roll rotate at a speed of 18rpm during the cooling process, and at the same time coat the heat insulating material (2) on the roll neck (1) surface , and the roll neck (1) is placed outside the cooling device (5). The insulation material (2) is CaO / SiO with a thermal conductivity of 0.043 (w / m.k) 2 , and its thickness is 2mm. Using mist and gas cooler (6), first press the spray quenching process parameter 1 (P 空气 =0.13MPa, P 水 =0.32MPa, Q 水 =1.75m 3 / h) Spray cooling for 6 minutes, then reduce the cooling rate, and switch to spray quenching process parameter 2 (P 空气...

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Abstract

A composite roll having uniform roll surface hardness and made of high-speed steel containing boron and a method for manufacturing the composite roll belong to the technical field of manufacture of rolls. A roll body is made of the high-speed steel containing boron, a roll core is made of spheroidal graphite cast iron, the roll body and the roll core are centrifugally cast in a compounded manner,and metallurgical bonding is realized. On the basis of high-tungsten high-speed steel, the chromium content of the roll body is reduced, and the boron and a proper quantity of trace alloying elementssuch as potassium, sodium, calcium, barium, zinc, magnesium, lanthanum, cerium and the like aer added into the roll body. The roll body is heated in a heating furnace, stays warm and then is placed in a cooling control device, a roll neck is coated with a heat-insulating material and is placed outside the cooling control device, the roll body is in spray cooling according to a spray quenching process 1, then is in spray cooling according to a spray quenching process 2 until the temperature of the roll body is lower than 160 DEG C, and is in natural air cooling, when the temperature of the roll surface rises to 300 DEG C, the roll body is in spray cooling according to the spray quenching process 2 again, spray cooling is performed repeatedly until the rising temperature of the roll surfacedoes not exceed 300 DEG C, and then the roll body is in air cooling to the room temperature. The roll surface hardness of the composite roll is high, hardness uniformity of the roll surface is good, wear resistance of the roll is fine, and the service life of the composite roll is long.

Description

technical field [0001] The invention relates to a manufacturing method of a high-speed steel composite roll, in particular to a boron-containing high-speed steel composite roll with uniform 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32B22D13/00B22D19/16C21D1/18C21D9/38B21B27/00
Inventor 符寒光邢建东雷永平蒋业华周荣郭红星岑启宏
Owner BEIJING UNIV OF TECH
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