SU805165A1 - Device for nondestructive inspection of ferromagnetic material mechanical properties - Google Patents

Description

(54) DEVICE FOR NON-DESTRUCTIVE TESTING

MECHANICAL PROPERTIES OF FERROMAGNETIC MATERIALS

The purpose of the invention is to show the accuracy of the control.

The goal is achieved by the fact that the device is equipped with a series-connected current stabilizer, the input of which is connected to a direct current source, differentiation unit, a square root extraction unit and a threshold unit, the second input of which is connected to the output of the current stabilizer, a capacitor and a magnetizing solenoid / output with control We are switching input and measuring unit.

The drawing shows a structural diagram of the proposed device.

The device contains series-connected direct current source 1, stabilizer 2, differentiating unit 3, square root extraction unit 4 and threshold unit 5, the second input of which is connected to the output of current regulator 2, a capacitor 6 connected in parallel by a series-connected magnetizing solenoid 7 and switch 8 , the control input of which is connected to the output of the threshold unit, connected in series to the generator 9 for driving the flux-gate converter 10 and the measuring unit 11, connecting nnogo yield threshold unit 5.

The device works as follows.

The magnetizing solenoid 7 is installed with its end on the ferromagnetic material under study (not shown). In the initial state, when the switch 8 is closed, the capacitor 6 is charged with a stable in time current from the stabilizer 2 current supplied from the direct current source 1. The linearly increasing voltage of the charge of the capacitor 6 is fed to the input of the differentiating unit 3, the output of which thus forms a constant voltage level, the magnitude of which is directly proportional to the charge rate of the capacitor b.

The signal from the differential output of unit 3 is fed to the input of unit 4 / square root, the output voltage of which is proportional to the square of the input. From the output of block 4, the square root signal is fed to one of the inputs of threshold block 5, to the second input of which a linearly increasing charge voltage of capacitor 6 arrives. Thus, the potential of one input of threshold block 5 remains constant in time, and the potential of the second input linearly increases. When the voltage is linearly increased with the voltage value of the output voltage of the square root extractor unit,

the threshold unit 5, opening the switch 8. The capacitor 6 is discharged through the switch and the magnetizable solenoid 7, creating a pulsed magnetic field at the end of the solenoid. J During the discharge of the capacitor b from the output of the threshold unit 5, the measurement unit 11 is given a signal that prohibits the measurement, therefore the proposed device does not respond to

magnetic field created by a magnetizing pulse. The capacitor discharge field B of the signal of the threshold unit 5 becomes zero, the switch 8 is closed, and the measuring unit 11 fixes

5 the magnitude of the residual magnetization of the material, by which its mechanical properties are judged.

Introduction to the device of current stabilizer, differentiator, block

The extraction of the square root and the threshold unit makes it possible to sharply increase the stability of the pulsed magnetic field created at the end of the solenoid, since its voltage does not depend on the capacitance capacitance.

This circumstance leads to an increase in the accuracy of control of the mechanical properties of ferromagnetic materials.

Claims (2)

1.Non-destruction control by electromagnetic methods. MDNTP, collection, Part 1, 1971, p. 118. 2. Non-destructive methods and means of control and their application in industry. Minsk, Science and technology, 1973 (prototype).