SU1128155A1 - Device for pulse magnetic checking of ferromagnetic article physical mechanical parameters - Google Patents

Abstract

A DEVICE FOR IMPULSE MAGNETIC CONTROL OF PHYSICAL AND MECHANICAL PARAMETERS OF FERROMAGNETIC PRODUCTS, containing a magnetizing element, a software current pulse generator connected to it, a series-connected magnetosensitive element, a measuring unit and a recorder, which is applied to a projectile, a successively connected magnetosensitive element, a measuring unit and a magnetically sensitive element, a projectile surface pattern, a surface, a surface, a target, a target, a –– –––––––––––––––––––––––––––––––––––––––––––– memory, comparison unit and control unit, connected between the output of the measuring unit and the control input of the program generator torus-current pulses, the second input of the comparison unit is connected to the output of the measurement unit, the inputs of the control unit are connected to the measurement unit and the programmable current pulse generator, its outputs are connected to the measurement unit, unit, memory, comparison unit and recorder, and the programmable pulse generator current is made with adjustable pulse amplitude.

Description

The invention relates to the study of the physical and chemical properties of materials and alloys and can be used for the non-destructive control of the mechanical properties of ferromagnetic products. A device for controlling the physicomechanical parameters of ferromagnetic products is known, which contains a source of constant current, an electronic switch, a magnetizing system, implemented as two mutually perpendicular P-shaped ferromagnetic circuits with windings of power placed on them, connected independently of one another through an electronic switch with a constant source current, flux-gate converter installed in the plane of the poles of the magnetic cores symmetrically with their axis of intersection with the possibility of wok rotation This axis and connected via an electronic switch with an indicator (1. The disadvantage of this device is low accuracy due to the effect of the change in the gap between the transducer and the product being monitored. The device closest to the invention is a device for pulsed magnetic control of physical and mechanical parameters of ferromagnetic of products, containing a magnetizing element, a software current pulse generator connected to it, a magnetosensitive element connected in series, a measuring unit and a regis Rathore. The software current pulse generator is made with automatic programming of the number of pulses 2. A disadvantage of the known device is the low reliability of the control due to the influence on its results of the change in the gap between the magnetizing magnetically sensitive elements and the product being monitored. The aim of the invention is to increase the reliability of the control. The goal is achieved by the fact that a device for pulsed magnetic control of physico-mechanical parameters of ferroManoiTHbix products, containing a pumping element, 6 a key to it, a programmable current pulse generator, serially connected memory-sensing element, the measuring unit and recorder are connected in series with a memory unit connected in series, the comparison unit and the control unit connected between the output of the measurement unit and the control input of the software pulse current generator, the second input bpok the comparison is connected to the output of the unit measured, the inputs of the control unit are connected to the measurement unit and the programmable current pulse generator, its outputs are connected to the measurement unit, the memory unit, the comparison unit, and the recorder, and the current generator of current pulses is made with adjustable pulse amplitude . The introduction of a comparison block and a control block into the device leads to an increase in the reliability of the control by automatically selecting the optimal amplitude of the magnetizing pulses, in which the control results depend little on the size of the gap between the magnetizing and magnetically sensitive elements and the item being monitored. FIG. 1 shows a block diagram of the device; in fig. 2 - dependence of the residual field gradient on the amplitude of the magnetizing pulses with and without gap. The device consists of a magnetically sensitive element, which is a flux-probe-meter 1, connected to measurement unit 2, which is connected to recorder 3, memory unit 4 and unit, 5 comparison, the output of the latter is connected to control unit 6. The output of the control unit 6 is connected to the memory unit 4, the comparison unit 5, the measurement unit 2 and the programmed current pulse generator 7, which is connected to a magnetizing element made in the form of a solenoid 8. A ferrosonde gradiometer 1 is located inside the solenoid 8. Dependence of the residual field gradient from the amplitude of the magnetizing pulses without a gap is represented by curve 9 (Fig. 2), with a gap - curve 10. The device works as follows. When the control unit 6 is turned on, the latter starts a software generator 7 of current pulses, which forms successively the next series of demagnetizing and magnetizing pulses passing through the solenoid 8. The amplitude of the magnetizing pulses is increased first through one series and from the second through two series of pulses. The first series of demagnetizing pulses demagnetizes the monitored product (not shown), and the first series of magnetizing impulses of the initial amplitude cause a magnetic spot on the monitored product. A signal proportional to the residual magnetic field gradient acting on the flux probe gradiometer 1 is measured by measurement unit 2 and is fed to the input of memory block 4. The signal for the end of the measurement comes from the measurement unit 2 and the control unit 6. In this case, the control unit 6 outputs a resolution signal to the 4th unit pa3

Mating the rewriting of input information changes the transmission coefficient of measurement unit 2 to a larger one and restarts the program generator 7 of current pulses, which generates a second series of demagnetizing-magnetizing pulses, which first demagnetize the product and then magnetize it again, and the amplitude of these magnetizing pulses more than in the previous series. The signal about the end of the second series of pulses enters the block 6) milling, which in this case permits the measurement to block 2 of measurement and block 5 of comparison. At the same time, the signal from block 4 of memory or the previous measurement is fed to one input of comparison unit 5, and the signal from block 2 of measurement from the last measurement is sent to the second input. The result of the comparison of the data of these measurements comes from the output of the comparison unit 5 to the control unit 6. If the comparison result is less than zero, i.e. the output signal of measurement unit 2 from the subsequent measurement is more than the previous one, the demagnetization-magnetization cycle and the switching of the gain of measurement unit 2 are repeated until the e1 signals are compared, and the initial amplitude of the second series of magnetizing pulses is. If the signals are equal or their differences are greater than zero, the control unit 6 receives signals that record the amplitude of the magnetizing pulses and establish the specified transmission coefficient of the measurement unit 2. Subsequently, monitoring was realized with one cycle: demagnetization. - magnetization by a fixed amplitude; - measurements of the residual field gradient at a fixed gain of the measuring unit.

281554

In each pair of cyclag: demagnetization magnetization - measurement with the initial gain of measurement unit 2, demagnetization - pulse magnetization of greater amplitude - measurement with a large gain of measurement unit 2 - large amplitude and greater gain correspond to control without a gap between the magnetized solenoid

10 and material, and a smaller amplitude and a smaller gain factor correspond to the control with a gap. Since the dependencies of the magnitude of the residual field gradient of a locally magnetized product on the amplitude of 15 magnetising pulses in the presence of a gap (a smaller gain factor and a smaller amplitude of pulses) and without it (a larger gain factor and a larger amplitude of pulses) intersect (Fig. 2),

20 By varying the magnitude of the magnetizing impedances, cos, and comparing the results of measuring the residual field gradient, one can find the amplitude of the magnetizing pulses at which the measurement results are close, as in

25 ialychii a given gap, and without it.

The proposed device by choosing the optimal amplitude of the magnetizing pulses by simulating a change in the magnetic field, acting on the controlled product 30 with and without a gap, changing the amplitude of the magnetizing pulses and simulating the change in the residual field, acting on a ferrosonde probe with and without a gap, by changing the usability coefficient of the measuring unit, it allows for an order of magnitude to decrease the sensitivity to clearance, to increase the reliability of the control and to expand the range of controlled products (parts with non-ferromagnetic protective coatings). FCG.G at the end of the solenoid

Claims (1)

DEVICE FOR PULSED MAGNETIC CONTROL OF PHYSICAL AND MECHANICAL PARAMETERS OF FERROMAGNETIC PRODUCTS, comprising a magnetizing element, a programmed current pulse generator connected to it, magnetically sensitive element connected in series, a measuring unit and a recorder, characterized in that it is provided with a purpose of increasing reliability memory, a comparison unit and a control unit included between the output of the measurement unit and the control input of the software generator and pulses of current, the second input of the comparison unit is connected to the output of the measurement unit, the inputs of the control unit are connected to the measurement unit and the program generator of current pulses, its outputs are connected to the measurement unit, unit, memory, comparison unit to the recorder, and the program generator of current pulses is made with adjustable pulse amplitude. A .Z 1 1128155 2