RU1795364C - Method of ultrasonic testing of articles - Google Patents

Abstract

The invention relates to non-destructive testing and can be used in the electronics industry to verify the assembly quality of traveling wave tubes. The purpose of the invention is the expansion of the functionality for monitoring high-frequency packages of traveling wave tubes with dielectric support rods - is achieved due to the fact that the pulses of ultrasonic vibrations are excited alternately at both ends of each of the rods of the packet, the reflected signals for each rod are compared, the distance between pulses the location of defects is determined, and in each of the defect-free rods, the amplitude of the transmitted vibrations is measured and the value of the error is determined from its averaged value bag tension. 2 ill.

Description

SL

WITH

The invention relates to non-destructive testing and can be used in the electronics industry to verify the assembly quality of traveling wave tubes (LEV).

A known method for controlling the quality of contact of the conjugated elements of a product is to calibrate an ultrasonic sensor on a prototype of a high-frequency packet (HF packet) of TWT with reference defects, seal and immerse the HF packet in a bath with immersion liquid, and an oscillating signal is applied to the ultrasonic sensor frequencies, scan the sensor along the contact surface of the elements of the RF packet, measure the resonance peaks and determine the areas of poor contact of the elements of the assembled RF packet by comparison with standards.

The disadvantages of this method are the need to seal the controlled RF packet and place it in an immersion liquid, it is impossible to determine the presence and location of cracks in the dielectric supports of the retardation system and the inability to control the assembly tension of the RF packet.

The closest technical solution is the method of ultrasonic testing of tubular products, which consists in the fact that pulses of ultrasonic vibrations are excited at the end of the product being monitored, the transmitted signals are received from the opposite end, their parameters are measured, and defects are detected in the product and its wall thickness changes .

The disadvantage of this method is the narrow scope, limited

V |

YU

(L 00

about

4

products with an annular pipe profile, and the inability to determine the location of a defect in connection with the use of information only from past ultrasonic vibrations.

The purpose of the invention is to expand the functionality in the control of high-frequency packages of traveling wave tubes with dielectric support rods.

The goal is achieved by preliminarily exciting the pulses of ultrasonic vibrations at both ends of each of the package rods, comparing the reflected signals for each rod, determining the location of defects by the distance between the pulses, and measuring the amplitude of the transmitted vibrations in each of the defect-free rods and the average value determines the value of the assembly tension of the bag.

Figure 1 presents a General view of a device that implements the method; figure 2.- node I in figure 1.

The device comprises a frame 1, on which the front and rear headstock 2,3 are mounted, installed with the possibility of counter movement along the guides 4, the centering elements 5, the piezoelectric transducers 6 placed in them, fixed in the rotation mechanisms 7. On one of the headstock there is a replaceable latch 8 angular installation of the RF package, controlled by piezoelectric transducers mi, containing piezoelectric plate 9 and elastic protector 10. Controlled high-frequency package, indicated by the number 11,

Claims (1)

The claims The method of ultrasonic testing of products, which means that they emit pulses of ultrasonic vibrations from one end of the controlled product, receive transmitted signals at the other end of the product, which determine the state of the product parameters, characterized in that, in order to expand the functionality for monitoring high-frequency lamp packages includes dielectric support rods 12 with ends 13, a retardation system 14, a vacuum shell 15, and energy leads 16. The method is carried out as follows. The high-frequency package 1 is fixed in the centering elements 5 with a certain angular orientation from the output 16 of energy, which is carried out using a removable latch 8 of the angular installation, which is selected depending on the size of the controlled RF package. The transceiver piezoelectric transducer 6 is pressed against the end face .13 of one of the dielectric rods 12 through an elastic protector 10, by means of which an echo signal is emitted and received. The RF packet is then rotated at a fixed angle and measurements are repeated for the next two rods. Similarly, measurements are taken from the second ends of all the rods. Comparing the parameters of the received signals, the presence or absence of defective rods, as well as the location of the detected cracks are established. Then, piezoelectric transducers 6 are mounted on both ends of each of the defect-free rods, the signals of the oscillation transducers are received and analyzed, the measured amplitudes for all defect-free rods are averaged, and the assembly tension of the RF packet is determined. At the end of control the piezoelectric transducers 6 are retracted from the article, it is detached, the latch 8 is removed, and the headstock 2, 3 is retracted. waves with dielectric support rods pre-excite pulses of ultrasonic vibrations alternately at both ends of each of the package rods, compare the reflected signals for each rod, determine the location of defects by the distance between pulses, and measure the amplitude of the transmitted vibrations in each of the defect-free rods and by its average value the assembly tension of the bag is determined. 1C .19-