SU1716432A1

SU1716432A1 - Transducer for testing cylindrical articles

Info

Publication number: SU1716432A1
Application number: SU904809149A
Authority: SU
Inventors: Святослав Феоктистович Кукин
Original assignee: Производственное объединение "Минский тракторный завод им.В.И.Ленина"
Priority date: 1990-01-19
Filing date: 1990-01-19
Publication date: 1992-02-28

Abstract

Изобретение относитс к акустическим методам неразрушающего контрол . Цель изобретени - повышение производительности контрол за счет одновременной генерации на поверхности цилиндрического издели двух встречнонаправл ющихс пучков поверхностных ультразвуковых (УЗ) колебаний. Преобразователь с размещенным на плоской поверхности призмы 1 пье- зоэлементом 2 устанавливаетс на цилиндрическое изделие 9. Излученные пьезоэлементом 2 УЗ колебани 3 падают на отражающую поверхность 4, сформированную по полукубической параболической направл ющей, точка излома которой лежит в плоскости симметрии цилиндрической поверхности . После поверхности 4 отраженные колебани 5 и 6 попадают на контактные поверхности 7 и 8, сформированные по круговой направл ющей, центр которой лежит в плоскости симметрии цилиндрической поверхности. На поверхност х 7 и 8, контактирующих с изделием .9. УЗ колебани трансформируютс в УЗ поверхностные .волны 10 и 11. Преобразователем принимают как прошедшие по окружности издели 9, так и отраженные дефектом УЗ волны и по их параметрам определ ют качество , 8 ил.This invention relates to acoustic methods of non-destructive testing. The purpose of the invention is to increase the productivity of the control due to the simultaneous generation on the surface of a cylindrical product of two oppositely directed beams of surface ultrasonic (US) vibrations. A transducer with a piezoelectric element 2 placed on the flat surface of the prism 1 is mounted on a cylindrical product 9. The ultrasonic vibrations 3 emitted by the piezoelectric element 2 are incident to the reflecting surface 4 formed along a semicubic parabolic guide, the break point of which lies in the plane of symmetry of the cylindrical surface. After the surface 4, the reflected vibrations 5 and 6 fall on the contact surfaces 7 and 8, which are formed along a circular guide, the center of which lies in the plane of symmetry of the cylindrical surface. On surfaces 7 and 8 in contact with the product .9. Ultrasonic vibrations are transformed into ultrasonic surface waves 10 and 11. The transducer accepts both the circumferential products 9 and the waves reflected by the ultrasonic defect and their parameters determine the quality, 8 Il.

Description

Фиг.22

Y -I у,Y -I y,

№ Риг .ЗNo. Rig .Z

ФигЛFy

уat

vv

ДФиг .5Dfig .5

Риг. 7Rig. 7

17164321716432

Фиг. 6FIG. 6

Claims

Claim

An ultrasonic transducer for monitoring cylindrical products containing a flat piezoelectric element and a shaper of two ultrasonic beams with flat and mirror-symmetric cylindrical surfaces, the piezoelectric element is acoustically connected to the flat surface of the shaper so that its acoustic axis lies in the plane of symmetry of the cylindrical surface of the shaper perpendicular to its generatrix, characterized in that that, in order to improve the performance of the control of surface defects, a cylindrical surface made of two conjugated parts of the contact formed along a circular guide, the center of which lies in the plane of symmetry of the cylindrical surface, the reflecting one, formed along the semi-cubic parabolic guide, the break point of which lies in the plane of symmetry of the cylindrical surface, and the distance L along the arc of the circle between the extreme points is curved the surface of the former is selected from the condition where R is the radius of curvature of the contact surface;

a - angle of incidence of ultrasonic vibrations on the contact surface; 'd - the size of the piezoelectric element in the plane perpendicular to the plane of symmetry of the shaper.

Figure 2

Figure 4

Fig.Z