SU554973A1 - Ultrasonic Welding Device - Google Patents

Description

(54) DEVICE FOR ULTRASONIC WELDING

I

The invention relates to ultrasonic welding of metals and can be used in electronic engineering.

Metal-forming devices with ultrasound are known, consisting of an oscillation transducer, a waveguide and a tool l.

However, these devices must be tuned to the resonant mode in the process of deformation of the workpiece. When the oscillation system is disconnected, the resonant mode of its operation is disrupted; therefore, the operation mode of the ultrasonic equipment when using such oscillatory systems is made difficult.

The closest technical solution to the invention is an ultrasonic welding device consisting of a transducer, a waveguide, an elastic wave transformer and a welding tool 2J.

However, such a device allows one to introduce vibrations into the materials to be welded. In this case, in the case of transverse or bending oscillations of the instrument

maximum shear stresses are concentrated along the periphery of the working end, which leads to a deterioration in the quality of the joint.

. The aim of the invention is to improve the quality of the compounds.

This is achieved by the fact that a loop is made on the lateral surface of the tool, one horse of which is located in the node of longitudinal vibrations, and the other at the working end of the tool. The length of the loop is equal to an odd number of quarters of the wavelengths of the longitudinal oscillations.

The drawing shows the proposed device for ultrasonic welding. It consists of a converter 1, connected, for example, by soldering to a waveguide 2, to which a pin is attached to an elastic oscillation transformer 3 connected to a welding tool 4. A loop 5 is fixed on the side surface of the tool, for example by soldering.

Claims (2)

The device operates as follows. The longitudinal ultrasonic oscillations from the transducer 1 through the waveguide 2 and the elastic vibration transformer 3, falling on the welding tool 4, propagate in it. In the place of attachment of the loop 5 to the side surface of the rod of the working tool, a wave separation occurs. A part of the oscillations continues to propagate in the original direction along the axis of stern and a part along the loop. The energy ratio between them in the absence of losses at the junction is defined as the ratio of the cross-sectional areas of the rod and loop, i.e. where w is the energy of ultrasonic vibrations (UT) propagating in the rod after being connected to the loop; A2 is the energy of the ultrasonic wave propagating in the loop; 5x is the cross-sectional area of the rod; 5 - cross-sectional area To eliminate the misalignment of the oscillating system, the loop has a length equal to an odd number of quarters of the wavelengths of the longitudinal vibrations and is fastened at one end to the longitudinal vibration unit and at the working end of the welding tool. To the working end of the tool, oscillations from the loop are perpendicular to the direction of propagation of longitudinal oscillations in the rod. Due to this, a complex oscillatory motion is introduced into the welding zone: in the plane of the elements to be welded and perpendicular to them. Since the shearing forces are concentrated in the immediate vicinity of the working end of the welding tool, the end face moves parallel to the surfaces to be welded and the mechanical stresses from the loading force of the longitudinal and transverse vibrations are distributed evenly over the entire area of the joint. This contributes to the emergence of interaction zones over the entire area of the working end of the tool, which improves the quality of the connection. The efficiency of using the device for ultrasonic welding is achieved by introducing two types of vibrations into the junction zone with a uniform distribution of mechanical stresses along the welding plane. Claims of the invention A device for ultrasonic welding, comprising a transducer, a waveguide, an elastic vibration transformer and a welding tool, characterized in that, in order to increase the quality of the connection, there is a loop on the side surface of the tool, one end of which is located the working end of the tool, while the length of the loop is equal to an odd number of quarters of the wavelength of the longitudinal oscillations. Sources of information taken into account in the examination: 1. Severdenko V. P., et al. Metal pressure treatment with ultrasound, Minsk, Science and Technology, 1973, p. 85, fig. 28a 2. Rydzevsky, AP and others. Ultrasonic welding in microelectronics, Reviews on electronic equipment. Seri: technologists, production organizations and equipment, vol. 7 (234), Central Research Institute Electronics, 1974, p. 5 (prototype).