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Treatment method of high-speed steel roller surface cracks

A roll surface and processing method technology, applied in the field of hot roll defect detection, can solve problems such as threats to rolling mill equipment, roll accidents, cost increase, etc., and achieve the effect of reducing product cost and ensuring product quality

Inactive Publication Date: 2015-03-25
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high price of high-speed steel rolls, crack reduction will increase the cost. High-speed steel rolls are used in the upstream rack. The "steel jam" accident in production seriously threatens the safe use of high-speed steel rolls. After the steel jams, the hot steel plate and the roll surface contact, resulting in deep thermal cracks on the roll, high-speed steel rolls have high hardness, and the cracks expand rapidly. Improper handling will cause the roll to peel off or even burst
Due to the high cost of high-speed steel rolls, if the cracks are completely removed, a large number of abnormal diameter reductions will be caused, and the capital loss of the rolls will be serious, resulting in increased product costs and affecting the utilization rate of high-speed steel rolls.
Retaining cracks will cause roll accidents, affect production, threaten rolling mill equipment, and surface cracks become a bottleneck restricting the use of high-speed steel rolls

Method used

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  • Treatment method of high-speed steel roller surface cracks
  • Treatment method of high-speed steel roller surface cracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: On the 1700 production line of Benxi Iron and Steel Hot Rolling Plant, there were four imported high-speed steel rolls worth 2.4 million yuan on August 17, 2008 and November 30, 2009. Due to a steel jamming accident during the rolling process, the rolls Surface cracks appeared, and the depth of the cracks was detected to be 12mm and 15mm in the radial direction. After on-site inspection by foreign experts, it was determined that the 4 rolls were unusable and scrapped ahead of schedule.

[0030] Due to the high price of the rolls, 4 rolls were kept. After many tests and researches, this method was finally invented.

[0031] In May 2010, it was decided to grind the opening of the crack to the closed state. At first, it was carefully tracked and used, and finally the feasibility of the method of the present invention was determined. Wherein 06YS02G01 and G06 two rolls after grinding Φ4.15mm, use according to the method of the present invention, during from May 2...

Embodiment 2

[0033] Example 2: During the use of domestic high-speed steel rolls in September 2012, it was found that Φ6mm equivalent irregular open defects occurred on the roll body. The ultrasonic detection depth was 35mm, and the defects reached the effective use radius of the roll. If the roll is scrapped, it will lose 760,000 yuan. After several inspections, it is considered that the defect is hole-like in appearance and generally regular in appearance, but there is no obvious ring crack, and the inside is narrow crack-like, slightly inclined, and the overall stability is relatively stable. The non-destructive testing method can be used to monitor its surface crack shape and internal shape, and it can be used safely, and finally the roll can be used safely to the scrapped diameter. Such as figure 2 a, figure 2 b, figure 2 c, figure 2 As shown in d, the defect gradually decreases until it is eliminated with the normal wear of the roll during use.

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Abstract

The invention belongs to the field of hot-rolled roller defect detection, and relates to a treatment method of high-speed steel roller surface cracks. Crack properties are classified through detection of a grinder eddy current flaw detector, and whether cracks are net type hot cracks is determined; shapes of surface cracks are observed through magnetic powder flaw detection to determine whether the cracks are without annular fractures; the determined cracks without the annular fractures are subjected to ultrasonic flaw detection, and whether the inside is in a stable state is determined; and the cracks in an instable state are polished and detected until the cracks are in a stable state. According to the method, various surface cracks can be clearly determined, and inside and outside forms of the cracks can be monitored, so that a correct treatment method can be adopted, and accordingly, a high-speed steel roller is safely used under the condition that part of surface cracks are not required to be cleared.

Description

technical field [0001] The invention belongs to the field of defect detection of hot-rolled rolls, and in particular relates to a processing method for surface cracks of high-speed steel rolls. Background technique [0002] Due to the high price of high-speed steel rolls, crack reduction will increase the cost. High-speed steel rolls are used in the upstream rack. The "steel jam" accident in production seriously threatens the safe use of high-speed steel rolls. After the steel jams, the hot steel plate and the roll surface Contact will cause deep thermal cracks on the roll. High-speed steel rolls have high hardness and cracks will expand rapidly. Improper handling will cause the roll to peel off or even burst. Due to the high cost of high-speed steel rolls, if the cracks are completely removed, a large number of abnormal diameter reductions will be caused, and the capital loss of the rolls will be serious, resulting in increased product costs and affecting the utilization ra...

Claims

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Application Information

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IPC IPC(8): G01N27/84G01N27/90G01N29/04
Inventor 于浩孟伟周勇董宝权于文禹
Owner BENGANG STEEL PLATES
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