Fault detection method of roller body chamfering

Abstract

The present invention discloses a crack detection method for a roller body chamfer. The steps of the method are as follows: step 1, a surface ultrasonic probe is directly contacted with the surface of the roller body through a couplant; a distance H between the surface ultrasonic probe and the most external end of a roller roll body chamfer face is between 20 mm and 30 mm; step 2, a machine is started up; so the surface ultrasonic probe carries out all-round scanning examination to the chamfer face of the roll body; step 3, the reflection echo produced by the most external end of the chamfer and the reflection echo produced by the most internal end of the chamfer are taken as the standard echo; a defect is determined according to other reflection echoes between the two standard echoes. When the defect on the chamfer face is detected, the type of the defect is ensured through a magnetic particle detecting method. With the method provided by the present invention, the various defects which can not be observed through naked eyes on the chamfer face of the roll body can be detected; so the condition of product disqualification caused by the expansion of the defect on the chamfer face in the continuous quenching and other processes is avoided.

Description

technical field [0001] The invention relates to a roll flaw detection method, in particular to a roll body chamfer flaw detection method. Background technique [0002] The roll is one of the important parts of the steel rolling equipment. The roll is processed by the roll blank. The main process is: rough turning, quenching and tempering, quenching, cold treatment, tempering and finishing of the roll blank to obtain the finished roll. In the manufacturing process of roll blanks and rolls, some defects will inevitably occur inside and on the surface of the roll body. At present, the internal defects of the roll body can be detected by ultrasonic flaw detection method and X-ray method, and the surface defects can be detected by ultrasonic flaw detection method, magnetic particle flaw detection method, eddy current flaw detection method and coloring flaw detection method. The detection of internal defects of the roll body is generally carried out after rough turning, and the d...

AI Technical Summary

Problems solved by technology

However, in the manufacture of rolls, the defects on the roll body are all detected, and there is no report on the detection of defects on the chamfered surface of the roll body.

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