Fast sample plate calibration method of gamma-ray thickness gauge

Abstract

A fast sample plate calibration method of a gamma-ray thickness gauge is mainly used for detecting the thickness of silicon steel. The method comprises the steps that 1, physical measurement is carried out on silicon steel sample plates of different thicknesses to obtain the absolute thickness values of the sample plates of all the thicknesses; 2, the silicon steel sample plates of the different thicknesses are manually measured on the gamma-ray thickness gauge one to five times, and the average manual measurement thickness value is calculated; 3, the thickness deviation value of the sample plates is calculated; 4, a compensation factor is determined, and meets the conditions that the absolute value of the thickness deviation value of the silicon steel sample plates with the thickness of 0.5 mm is not larger than 3 micrometers, and the absolute value of the thickness deviation value of the silicon steel sample plates of other thicknesses is not larger than 6 micrometers; and 5, the compensation factor is stored and calibrated on the gamma-ray thickness gauge. Calibration time ranges from 45 minutes to 1 hour; the number of times of starting a radiation source is 1 / 5 of original calibration time; calibration precision is higher than calibration of an original procedure; and the thickness quality of finished steel plates is improved.

Description

technical field [0001] The invention belongs to the field of metal detection automation and is mainly used for detecting the thickness of silicon steel. The gamma-ray thickness gauge is a gamma-ray thickness gauge produced by DMC (Ruimei) Company of the United States. Background technique [0002] The Sendzimir rolling mill is a reversible 20-roll cold rolling mill. It takes 5 passes of reciprocating rolling to roll a 2.6mm thick silicon steel raw coil into a 0.5mm finished coil. During the rolling process, the thickness feedback is provided by the American DMC (Ruimei) The γ-ray thickness gauge produced has a C-shaped frame at the entrance and exit, and is equipped with two sets of identical radiation sources and ionization receiving amplifiers. [0003] Due to the reciprocating rolling, the thickness gauge needs to measure steel plates of different steel types and thicknesses. In order to ensure the accuracy of the thickness measurement, it is necessary to calibrate all t...

AI Technical Summary

Problems solved by technology

With the increase of varieties and output of high-grade silicon steel, the silicon content of high-grade silicon steel is relatively high, and small changes in composition have a great impact on the calibration success rate and measurement accuracy. The above-mentioned calibration accuracy and calibration time can no longer adapt to the thickness, quality and output of high-grade silicon steel.