Abstract: Large vibration tool, vibrating at ultrasonic frequency, especially for applications in the welding, joining or cutting of materials, especially thermoplastics, in cleaning or emulsifying by the activation of a liquid medium, in gas spraying or in shot blasting by blasting any kind of medium, made in the form of a circular sonotrode hollowed out at its center so as to produce a cavity allowing a shape approaching that of a bell to be obtained, said tool having a linking mass providing surface coupling with a vibrational excitation element; at least one circular membrane vibrationally excited at its center or at one end; and at least one tube-shaped final element, the end of which defines the working area of the sonotrode, linked to the linking mass via the said membrane, the latter transmitting the vibration to the said final element whose length is defined by a longitudinal vibration mode tuned to the said excitation frequency.

Abstract: Large vibration tool, vibrating at ultrasonic frequency, especially for applications in the welding, joining or cutting of materials, especially thermoplastics, in cleaning or emulsifying by the activation of a liquid medium, in gas spraying or in shot blasting by blasting any kind of medium, made in the form of a circular sonotrode hollowed out at its center so as to produce a cavity allowing a shape approaching that of a bell to be obtained,

Abstract: Method for cleaning or decoring a casting, wherein that, separately or in combination: the said casting may be excited by an ultrasonic source of vibration, to allow residual material in contact with the walls of the said casting to become detached, this casting resting on a number of anvils placed on vibrating means supporting the casting and in contact with a number of sonotrodes, the said casting may be beaten at a very low frequency so as to cause large-sized internal residue such as a sand-based core insert to crack up, vibrating means may be used to impart a low-frequency linear vibration to this casting so as to break up and fluidize the cracked bits, the material issuing forth from the said casting may be extracted using a stream of fluid.

Abstract: A method of cleaning a metal part such as a casting, wherein the part to be treated is placed on a support plate inside a container full of fluid, and at least one vibration generator is positioned in contact with the part. Generators are used to excite one natural mode of vibration of the part, causing the fluid inside the part to cavitate. The vibration generators in contact with the part operate with a running cycle for the vibration sources which is optimized by managing the state of the sources.

Abstract: Method of heating by emission of electromagnetic radiation, wherein at least one emitting source is arranged extending in the form of a resistive element matching as close as possible the geometry formed by the joint lines of the thermoplastic components to be joined together with a reflecting zone conforming likewise to the profile of the resistive element, then an energy source, such as, especially, an electric current, is caused to pass inside the said emitting source so as to cause, by the Joule effect and by focusing the released radiation onto the reflective surfaces, possibly coated with a metal film, a surface layer of material at the interface of the said components to melt, and then the radiating source is set back in a position which does not interfere with the joining of the components.