SU1226261A1 - Arrangement for determining mechanical properties of ferromagnetic articles - Google Patents

Abstract

The invention relates to non-destructive testing of the mechanical properties of ferromagnetic materials. The aim of the invention is to increase the reliability of quality control of sheet metal. The portion of the monitored product on which the magnetizing element is mounted is successively magnetized to saturation, and then partially demagnetized by current pulses of opposite polarity. After each cycle of magnetization and demagnetization by a ferrosonde gradiometer, the residual magnetization of the test area is measured. Measurement results through the switch are recorded in memory units. From the outputs of the memory blocks, information is fed to an adder, at the output of which a signal is generated that depends only on the mechanical properties of the product and does not depend on its thickness. The mode of operation of the switch is set by the delay unit. 1 il. i (L

Description

The invention relates to non-destructive testing of the mechanical properties of ferromagnetic materials and products and can be used in the metallurgical industry to control the quality of sheet metal and in mechanical engineering to control the quality of heat treatment.

The purpose of the invention is to increase the reliability of the control.

The drawing shows a block diagram of a device for determining the mechanical properties of ferromagnetic products.

The device contains a magnetizing element 1, made in the form of a solenoid, a source 2 of a two-pole pulse current, shapers 3 and 4 of different polarity pulses connected between the outputs of the source 2

a bipolar pulse current and a 13X0 house of the magnetizing element 1, a delay unit 5, two outputs of which are connected to the second inputs of the formers 3 and 4 pulses, and the input is connected to the third output of the source 2 of a two polarity pulse current connected in series by a ferrosonde gradiometer 6, measuring unit 7, switch 8, the second and third inputs of which are connected to the third and fourth outputs of the delay unit 5, the first memory unit 9, the supervisor 10 and the indicator 11, and the second memory unit 12 connected between the output of the switch 8 and the second th input of the adder 10.

The device works as follows.

The magnetizing element 1 with the inside of the flux-probe gradiometer 6 is mounted with an end on the surface of a controlled ferromagnetic product (not shown). The source 2 of the bipolar pulsed current accumulates electrical energy and, at the end of the charging, triggers the delay unit 5, which successively at set intervals sends signals to the magnetizing pulse generator 3 and the switch 8 or demagnetizing pulse generator 4 and again to the switch 8.

The magnetizing pulse shaper 3 opens and transmits a current pulse through the magnetizing element 1, the amplitude of which ensures the creation of a pulsed magnetic field on its torus and a larger coercive force that is sufficient to introduce the local portion of the controlled product into magnetic saturation. Then shaper 3 is closed. The magnitude of the normal component of the local magnetic field of the residual magnetization, which carries information about the thickness of the test product, is measured.

The measurement is carried out as follows. The signal from the flux-gate gradiometer 6 is fed to the measuring device 7 and through the switch 8 to the block 9 of memory. After the measurement is completed, the demagnetizing pulse shaper 4 opens and passes a current pulse through the magnetizing element 1 1, which forms a demagnetizing pulse of a magnetic field at its end, the value of k is: less expensive than the magnetizing and insufficient for remagnetization

a controlled item, i.e. the product is partially demagnetized. The normal gradient component of the local magnetic field of the residual magnetization carrying information on the mechanical properties and thickness of the test product is again measured, and is stored by block 12.

The signals from blocks 9 and 12 are then fed to the adder 10 and to the indicator 11, and a total signal is derived, which depends on the mechanical properties of the product and does not depend on its thickness.

Formula of invention

A device for determining the mechanical properties of ferromagnetic products, containing a magnetizing element made in the form of a solenoid, a source of bipolar pulsed current, two different field generators of pulses connected between the outputs of a bipolar pulsed current source and the input of a magnetizing element, a delay unit whose two outputs connected to the second inputs of the pulse formers of 1 pulse, and the input is connected to the third output of the source of a two-polarized pulse current, and series-connected ferrosonde-grad The meter is located inside the solenoid, the measuring unit and the indicator.

characterized in that, in order to verify the authenticity of the control, it is equipped with a series-connected switch connected between the measuring unit and the indicator, the second and third inputs

Editor I. Derbak

Compiled by B, Krapivin

Tehred I. Veres Proof-reader E. Sirohman

Order 2121/39 Circulation 778 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

12262614

which are connected to the third and fourth outputs of the delay block, the first memory block and the adder, and the second memory block connected between the switch output and the second input of the adder.

Claims (1)

Claim A device for determining the mechanical properties of ferromagnetic products, containing a magnetizing element made in the form of a solenoid, a bipolar pulse current source, two drivers of bipolar pulses, connected between the outputs of the bipolar pulse current and the input of the magnetizing element, a delay unit, two outputs of which are connected to the second inputs of the shapers pulses, and the input is connected to the third output of the bipolar pulse current source, and the flux-gate gradient is connected in series a meter located inside the solenoid, a measuring unit and an indicator, characterized in that, in order to increase the reliability of control, it is equipped with a switch connected in series between the measuring unit and the indicator, the second and third inputs of which are connected to the third and fourth outputs of the delay unit, the first unit memory and the adder, as well as the second memory unit, included · ₅ between the output of the switch and the second input of the adder.