SU957091A1

SU957091A1 - Magnetizing device

Info

Publication number: SU957091A1
Application number: SU803006179A
Authority: SU
Inventors: Зосим Григорьевич Каганов; Михаил Израилевич Белый; Вера Дмитриевна Горбоконенко; Евгений Михайлович Белый
Original assignee: Ульяновский политехнический институт
Priority date: 1980-11-20
Filing date: 1980-11-20
Publication date: 1982-09-07

Description

(5) НАМАГНИЧИВАЮЩЕЕ УСТРОЙСТВО(5) MAGNETIZING DEVICE

Изобретение относитс к нераэрушающим методам контрол ферромагнитных материалов на наличие нарушений сплошности поверхности и может быть использовано во всех отрасл х машиностроени .The invention relates to non-destructive methods of monitoring ferromagnetic materials for the presence of discontinuities in the surface and can be used in all branches of engineering.

Известно намагничивающее устройство к магнитографическому дефектоскопу , содержащее систему электромагнитов , наносные наконечники которых вы полнены из эластомагнетика, а обмотки электромагнитов прдключеТ1Ы к переменному источнику переменного то ка СП,A magnetizing device for a magnetographic flaw detector is known, which contains a system of electromagnets, the impurity tips of which are made of an elastomagnet, and the windings of electromagnets are connected to a variable source of alternating current SP,

Недостатком устройства вл етс тр,д4то оно не обеспечивает однородного намагничивани больших поверхнос гей и довольно сложно при использовании их в эксплуатации.The device has the disadvantage of tr, d4to it does not provide homogeneous magnetization of large surfaces and is quite difficult to use when used in operation.

Наиболее близким по технической сущности к изобретению вл етс намагничивающее устройство к магнитографическому дефектоскопу, содержащее последовательно-гибко соединенные магнитные элементы и охватывающие их токовозбуждающие контуры, служащие дл создани маг н1тного потокз в ферромагнитном материале 2.The closest in technical essence to the invention is a magnetizing device for a magnetographic flaw detector, containing sequentially-flexibly connected magnetic elements and enveloping their current-exciting contours, which serve to create magnetized fluxes in a ferromagnetic material 2.

Недостатком устройства вл етс то , что оно сложно в. эксплуатации и не обеспечивает однородное намагничивание изделий, имеющих сложную форму поверхности и различные размеры.The disadvantage of the device is that it is difficult to. operation and does not provide a uniform magnetization of products having a complex surface shape and different sizes.

10ten

Цель изобретени - расширение технологических возможностей намагничивающего устройства.The purpose of the invention is to expand the technological capabilities of the magnetizing device.

1515

Цель, достигаетс тем, что в намагничивающем устройстве, содержащем последовательно-гибко соединенные магнитные элементы и охватывающие их токовозбуждающие контуры, магнитные The goal is achieved by the fact that in a magnetizing device, which contains series-flexibly connected magnetic elements and current-exciting circuits encompassing them, magnetic

Claims

The 20 elements are made in the form of a profile with a spin wave of an elastomagnetic plate, reinforced with current-exciting circuits. FIG. 1 shows a diagram of the device; in FIG. 2 - diagram of magnetic field intensity. The device contains a plate 1 of an elastomagnet containing a mixture of rubber with carbon black and a ferromagnetic powder. The profiled side of plate 1 is reinforced with current-absorbing conductors 2, which form a circuit and are connected to an AC source (not shown). The plate with current-exciting conductors is magnetized by a pulsed magnetic field, resulting in the formation of groups of discrete permanent magnets. The north and south poles of these 3 magnets are inserted on the active profile-side of the plate. Preliminary magnetization of the plate with current-exciting circuits is carried out with the help of capacitor installations equipped with profile inductors. The profile of the inductor is taken from the condition of the passage of the injected current-exciting conductors between the successively flexible discrete permanent magnets. The device works as follows. Alternating current of high frequency is passed through the current-exciting conductors 2. The magnetic fields formed by the conductors with current are concentrated in the powder structures of permanent magnets, which play the role of ferromagnetic polarized cores. The resulting field is the algebraic sum of a self-magnetised elastomagnet and the current carrying conductors. The magnetizing device is superimposed on the object of control, on the surface of which a thin layer of hysteresis thermal indicator based on liquid crystals is applied. Through the conductors of the device pass powerful current pulses. Under the influence of an electromagnetic field, eddy currents are created in the product, which is accompanied by the appearance of temperature gradients in the zones of defects and structural heterogeneity, temperature gradients are recorded using a thermal indicator (bleaching temperature 21 and 33 ° C), which makes it possible to obtain a thermogram of the state of the surface layer of the object. The magnetizing device will effectively carry out the magnetization of large surfaces of a complex profile, which will increase the performance of quality control products. Claims of the invention A magnetizing device containing series-flexibly connected magnetic elements and current-exciting circuits encompassing them, in order to expand the technological possibilities, the magnetic elements are made in the form of a profiled elastomagnetic plate reinforced by the current-exciting circuits. Sources of information taken into account in the examination 1, USSR Author's Certificate No., cl. G 01 N 27/82, 1977.

2. USSR author's certificate number 86518, cl. G 01 N 27/82, 1976 (prototype).

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