SU1325345A1 - Device for determining magnetization in magnetic-particle tests - Google Patents

Abstract

The invention relates to non-destructive inspection of parts and relates to a magnetic powder inspection method. The purpose of the invention is to increase the accuracy of setting the magnetization mode when using the magnetic powder method of various steel grades in a wide range of specified modes of magnetization. The goal is achieved by the fact that the device contains blocks for determining the tangential component of the field strength, magnetic induction and magnetic permeability of the monitored area of the product 2. The induction in product 2 is determined by the value of induction in the sample 24, made from the material of the product being tested, magnetic field, the intensity of which is automatically maintained equal to the tangential component on the surface of the test item. When the product can be magnetized by a constant, alternating or pulsed field. 1 il. l with: 00 So 4 SP

Description

The invention relates to the destructive testing of products, serves to determine the setting of the magnetizing mode during magnetic magnetic powder inspection and can be used in all fields of engineering.

The purpose of the invention is to improve the accuracy of the magnetization mode setting by determining the induction of the controlled area of the product,

The drawing shows a functional diagram of the proposed device.

The device contains a magnetisation unit t of product 2, a Hall converter 3 connected in series, an amplifier 4, a signal type conversion unit 5 consisting of amplitude value bodies 6 connected to the output of the amplifier, a tangential component of field strength and sequentially connected determination circuit 7 module and integrator 8; measurement switch 9; multiplier 10; controlled current source 11; induction sensor 12 consisting of a solenoid 13 and two differential measuring coils 14 and 15, block 16 of induction outputs equal to induction in controlled article 2, including sequentially connected integrator 17, amplifier 18 and peak detector 19, induction dividing unit 20 into tangential field component, switch 21 and indicator 22 for registering and setting the magnetization mode, and reference signal generator 23 connected to the second input of the multiplier 10 a. When performing an induction measurement operation in the surface layer of the product, a sample 24, made of a material, is inserted into the measuring coil 15 of the induction sensor 12. ontroliruemogo article.

The device works as follows.

A Hall 3 transducer is placed on the area of the tested product, which is installed in a magnetic flaw detector for magnetization. From the Hall transducer 3, a signal is taken that is proportional to the tangential component of the field intensity H |, which is then amplified by amplifier 4. from which the signal goes to integrator 8 and

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When measuring the effective value of) H through the switch 9, the signal is fed to the first input of multiplier 10 from integrator 8, and when measuring the amplitude value Hi through switch 9, the signal is fed to the first input of multiplier 10 from meter 6. To the second input of multiplier signal supplied from reference signal generator 23. In the multiplier 10, the signal multiplies from generator 23 by a signal proportional to the tangential component N. The resultant, t-multiplication signal from multiplier 10 is fed to a controlled current source 11. A solenoid 13 is connected to the outlet of the stoker It, Source 11 ensures the equality of the fields in the solenoid, center 13 and on the surface of the part in the controlled zone. The Hall 5 signal removed from the converter 3 from the measuring winding of the differential sensor. 15, proportional to the induction in sample 24, goes to the integrator 17 and then through the amplifier 18 and the peak detector 19 is fed to the input of the B / H division unit 20. At the same time, the signal, proportional H, is also supplied to the dividing unit 20 from the switch 9 o

The switch 21 provides the signals: proportional to the tangential component of the field strength H

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II, d is proportional to induction B - to input III.

Indicator 22 alternates between values В,, Н

Consider .J, jU, by which the magnetization mode is determined by comparing the obtained values with the desired values. The criterion for evaluating the mode is the true value of induction Vl of the part in the control zone, equal to the induction of a sample of the same material. After comparison, the preset value B is set. In measurements, a sample is used that is made of a material with magnetic properties similar to the magnetic properties of the tested product. If the field strength H is equal on the product and the amplitude value of the field strength in the solenoid. 13 The induction value in sample 24 will be equal to the induction in the surface layer of the part in the controlled area.

The proposed device makes it possible to set the magnetization modes according to three parameters B, H, and iju, which makes it possible to more accurately determine and set the mode of magnetization of responsible-purpose products with a complex configuration and in a wide range of selected control modes.

Claims (1)

Invention Formula An apparatus for detecting magnetization during magnetic particle inspection, comprising a magnetization unit, a Hall transducer connected in series to be installed on the surface of a controlled product, an amplifier, a signal type conversion unit, a measurement mode switch and an indicator, characterized in that, in order to improve the accuracy of the magnetization mode , it is equipped with a signal connected in series by a multiplier, the input of which is connected to the measurement type switch, one source Editor A. Kozoriz Compiled by I. Keso n Tehred L. Serdyukova Order 3043/38 Circulation 776 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 0 five five current, an induction sensor consisting of a solenoid and two differential measuring coils, an induction measurement unit including a series-connected integrator, an amplifier and a peak detector, a dividing unit and a switch whose output is connected to an indicator, and a reference signal generator connected to the second multiplier input. , the signal type conversion unit is implemented in the form of an amplitude value meter of the tangential component of the field strength, the output connected to the first switch terminal bodies of the type of measurement, and a serially connected circuit for determining the module, the input connected to the input of the meter of the amplitude value of the tangential component and the integrator connected by the output to the second terminal of the switch, the sensor of the type of measurement, the output of the switch of the type of measurement connected to the inputs of the division unit and the second input of the switch , and the output of the peak detector is connected to the third input of the switch. Proofreader V. Booth ha Subscription