UA18486U - Ultrasonic concentrator - Google Patents

Abstract

An ultrasonic concentrator is made in the form of a solid of revolution of variable section. Its profile has a form determined by the relationship: where Dx - cross-section diameter at point x; D0 - diameter of minimum cross section; x - coordinate.

Description

Description of the invention

The useful model refers to ultrasonic technology and can be used when conducting 2 technological processes of ultrasonic welding of materials.

There are known and described devices of a similar purpose |1), where the ultrasonic concentrator is made in the form of a rod of variable conical cross-section. However, the disadvantage of such a concentrator is the low intensity of ultrasonic energy in a given section, and as a result, insufficient sound energy density is observed at the point of contact of the concentrator with the material during ultrasonic processing.

As a prototype, an ultrasonic concentrator in the form of a body of rotation with a variable cross-section of stepped shape (21. This prototype is actually a combination of two concentrators of a prismatic shape, which are characterized by different values of the cross-section.

The shortcomings of the prototype include the possibility of hub failure in the nodal cross-section in the mode of large amplitudes of the oscillating speed, since the plane of zero displacement coincides with the 12th plane of maximum mechanical cyclic stresses. In addition, in this mode there is a high probability of significant sensitivity to the loads applied to the end of the prototype.

The useful model is based on the task of significantly increasing the coefficient of concentration of the amplitudes of oscillations, due to the fact that the profile has a shape that is determined according to the ratio:

Because hard

Op NO N where

B, - cross-sectional diameter at point x;

IN NI what , - sh - diameter of the minimum cross-section;

HOW - coordinate.

And this, in turn, makes it possible to obtain a significant maximum increase in the amplitude of the oscillations of the working end (from the concentrator without a corresponding increase in the power of the converter, which ensures the achievement of the technical result.

The essence of the useful model is explained by the drawing, where Figure 1 shows an ultrasonic concentrator "E of a special shape, and Figure 2 shows the distributions of displacement amplitudes and cyclic stresses along the length of the concentrator. co

The ultrasonic concentrator 1 is rigidly connected to the magnetostrictive energy converter of electrical vibrations into mechanical energy by the end of a larger cross-section 2. Either a technological tool or a working sample is attached to the narrow end of the concentrator for conducting technological processes of ultrasonic welding. In addition, the drawing (figure 2) shows the distributions of displacement amplitudes 4 and cyclic stresses 5 along the axis of symmetry of the hub. These dependencies are clearly " 70 The thesis regarding the mismatch of the node of mechanical oscillations with the maximum of mechanical stresses on the first 2 s form is confirmed, which ensures long-term effective operation of the proposed useful model in ultrasound technology. :z» In the thus created ultrasonic oscillating system (magnetostrictive converter - ultrasonic concentrator - working sample), oscillations are excited by smoothly changing the operating frequency, BRINGING them to the phenomenon of resonance on the first form. The amplitude of these longitudinal torsional oscillations is recorded using a microscope (not shown) at the free end of the concentrator.

Conducted tests using a useful model showed that the amplification factor of the amplitudes of oscillations is 3-4 times higher than the known ones. и5» Sources of information 1. Mora K.MU., Gootiv A. Te rpuzisa! apa bBiioodisai EpPesiv oi Nidp-Rgedoepsu Botspa UUamez oi Ogeai so Ipsepziu, РЙ.Mad. (7), 4, 417, 1927.

F 2. Severdenko V.P., Klubovych V.V., Stepanenko A.V. Processing of metals by pressure with ultrasound. - Minister of State:

Science and technology, 1973. - pp. 35-36.

Claims (1)

29 Formula of the invention p An ultrasonic concentrator made in the form of a body of rotation of a variable section, which is distinguished by the fact that its profile has a shape determined by the ratio: bo pe s te de r, - diameter of the cross section at point x; bo bo - diameter of the minimum cross-section;