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Nondestructive inspection method for roll neck of support roll

A non-destructive flaw detection and support roller technology, applied in the direction of material magnetic variables, etc., can solve the problems of inability to assess the degree of crack damage, poor detection sensitivity, inability to accurately locate crack positions and crack depths, and achieve accurate measurement and hazard assessment, safe use. significant, significant effect

Inactive Publication Date: 2012-12-19
JIGANG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the blind area of ​​the probe, the detection sensitivity of this method is poor, and it is impossible to accurately locate the crack position and crack depth
Unable to accurately assess the degree of crack damage

Method used

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  • Nondestructive inspection method for roll neck of support roll
  • Nondestructive inspection method for roll neck of support roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0040] see figure 1 , figure 2 , a backup roll roll neck non-destructive testing method, comprising the steps of:

[0041] (1) Grinding of the roll neck: perform preliminary grinding on the roll neck, remove the rust on the surface of the roll neck, and use sandpaper to polish, so that the surface finish of the R part of the roll neck reaches Ra0.2;

[0042] (2) Surface wave detection: Use a small-sized chip surface wave probe to detect the roll neck position, and if there is an abnormal echo area in the surface wave scan, mark the abnormal echo area;

[0043] (3) Magnetic particle inspection: carry out wet continuous magnetic particle inspection on the abnormal echo area, using DC yoke and black

[0044] Magnetic suspension fluid, which magnetizes the area to be detected in both axial and circumferential directions, and marks th...

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PUM

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Abstract

The invention discloses a nondestructive inspection method for the roll neck of a support roll. The nondestructive inspection method is characterized by comprising the following steps of: 1, roll neck grinding; 2, surface wave detecting; 3, magnetic powder detecting; 4, coloring detection; and 5, crack depth sounding. According to the invention, crack detection is carried out on an R part of the roll neck, the sensitivity of the crack detection can be increased to 0.01mm, and the false alarm caused by repair welding of the R part of the roll neck can be effectively avoided. Meanwhile, the depth of a crank of the roll neck is accurately measured and the hazard assessment is carried out on the crack, and the significance is achieved in safety use of the support roll.

Description

technical field [0001] The invention relates to the field of hot continuous rolling steel strip rolling, in particular to a non-destructive flaw detection method for roll necks of backup rolls. Background technique [0002] As an important spare part in steel rolling production, hot-rolled backup rolls have the characteristics of long service life, high unit cost and heavy rolling force. However, because the roll neck R is located on the periphery of the sealing ring, it is subjected to the erosion of cooling water and the heating of oil film oil during use, and this part is severely corroded. The backup roller acts as a driven roller and does not bear torque itself. However, the roll neck is the variable diameter part from the thick roll body of the back-up roll to the roll neck oil film bearing, and the roll neck of the back-up roll bears the repeated action of alternating shear stress. As the most stressed part in the rolling process, it is used During the process, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/84
Inventor 时连宾常大勇陈传玉王玉洁
Owner JIGANG GRP
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