SU945764A1

SU945764A1 - Article magnetographic checking method

Info

Publication number: SU945764A1
Application number: SU711616154A
Authority: SU
Inventors: Николай Сергеевич Акулов; Валерий Сергеевич Козлов; Олег Антонович Жолнерович; Александра Михайловна Шарова
Original assignee: Отдел Физики Неразрушающего Контроля Ан Бсср
Priority date: 1971-01-11
Filing date: 1971-01-11
Publication date: 1982-07-23

Description

(5) СПОСОБ МАГНИТОГРАФИЧЕСКОГО КОНТРОЛЯ ИЗДЕЛИЙ(5) METHOD FOR MAGNETOGRAPHIC CONTROL OF PRODUCTS

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Изобретение относитс к магнитографическому контролю и может быть использовано дл контрол качества изделий из ферромагнитных материалов.The invention relates to a magnetographic control and can be used to control the quality of products made of ferromagnetic materials.

Наиболее близким по технической сущности к изобретению вл етс способ магнитографического контрол изделий из ферромагнитных материалов, заключающийс в том, что изделие намагничивают совместно с размещенным Q на его поверхности носителем, считают с носител магнитограмму и по ней суд т о наличии дефектов The closest to the technical essence of the invention is a method of magnetic inspection of products made of ferromagnetic materials, which means that the product is magnetized together with the carrier placed Q on its surface, the magnetogram is counted from the carrier and judged by the presence of defects

Недостаток известного способа заключаетс в отсутствии эталонировани J5 контраста магнитной записи на носителе , что снижает достоверность контрол .A disadvantage of the known method is the absence of J5 contrasting the magnetic recording on the media, which reduces the reliability of the control.

Цель изобретени - повышение достоверности контрол ..20The purpose of the invention is to increase the reliability of control .. 20

Указанна цель достигаетс за счет того, что на «магнитном носителе получают немагнитные участки, измер ют сигнал, обусловленный этими участками , и по величине этого сигнала суД т о контрасте магнитной записи.This goal is achieved due to the fact that non-magnetic sections are received on a magnetic carrier, the signal due to these sections is measured, and the magnitude of this signal is found in the contrast of the magnetic recording.

Способ осуществл етс следующим образом .The method is carried out as follows.

На магнитном носителе получают не- магнитные участки, например .вырезают отверстие или на небольшом участке ленты оставл ют только узкую полоску магнитного сло . Накладывают магнитный носитель на изделие так, чтобы отверстие было расположено в исследуемой зоне. Измер ют сигнал, обусловленный немагнитным участком носител , и по величине этого сигнала суд т о контрасте магнитной записи на носителе .Non-magnetic areas are obtained on a magnetic carrier, for example, a hole is cut out, or only a narrow strip of magnetic layer is left in a small section of the tape. Impose a magnetic carrier on the product so that the hole was located in the study area. The signal due to the non-magnetic portion of the carrier is measured, and the magnitude of this signal determines the contrast of the magnetic recording on the carrier.

Claims

In order to select the magnetization mode when carrying out magnetic control, the carrier is applied to the defect-free area of the product. Then, the magnetization of the product is changed until a magnetic saturation occurs in the product, and the growth rate of the carrier bias, which is determined by the signal from the nonmagnetic region, is not maximized. Then the magnetization of the carrier corresponds to its maximum sensitivity. Then, magnetic products inspection is carried out. The proposed method makes it possible to obtain information on the intensity of magnetization of the carrier and, thereby, to increase the reliability of the magnetic control. Claims of Invention The method of magnetographic control of products made of ferromagnetic materials v.-I. . This means that the product is magnetized together with the carrier placed on its surface, the magnetogram is read from the carrier and it is judged that there are defects that, in order to increase the reliability of the control, non-magnetic sections are obtained on the magnetic carrier. , the signal due to these areas is measured, and the magnitude of this signal determines the contrast of the magnetic recording. Sources of information taken into account during the examination 1. Kozlov B.C. Physics of magnetographic flaw detection. M., Mechanical Engineering, 1968, p. tO-SI (prototype).