JPH0441985Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention utilizes mechanical vibrations mainly in the ultrasonic frequency range using sound waves or ultrasonic waves, and is applied to, for example, welding plastics, and is perfect. This invention relates to specific means for adjusting how to make the vibration amplitude uniform on the end face of an ultrasonic horn that applies vibration in order to perform welding.

(Description of Prior Art) Fig. 1 shows an overview of a known vibrating horn that has been conventionally used as standard in the industry. A plate horn is fixed to the horn 1 by an appropriate method such as screwing or welding to form a resonator, and its height is 1/2 of the vibration wavelength λ. When the vibrating horn 1 is driven, the end face 3 of the plate horn 2 reciprocates as shown by arrow 4.

In this case, the amplitude of the vibrating end face is not uniform along the end face, but decreases toward the lateral ends, as shown in FIG.

Therefore, as shown by dotted lines in FIG. 3, both sides of the plate horn 2 are shaved off, and the amount of scraping is varied to adjust the vibration amplitude of the vibration surface to be approximately constant as shown in FIG. 4.

Note that 5 is a slot, which is provided to suppress lateral vibration of the plate horn 2.

(Purpose of the invention) In order to make the end face vibrate as uniformly as possible with the same amplitude as possible, the conventional method was to cut the sides of a plate horn (made of metal such as duralumin) to narrow its width and reduce its mass. Although adjustment methods were in place, there were drawbacks such as the time required for machining and the fact that it became unusable if it was cut too much.

The present invention eliminates such drawbacks and simply attaches nuts of different thicknesses and therefore different masses to the top surface of the plate horn, and selects the nut with the most desirable dimensions that are effective in making the vibration amplitude uniform. The advantage is that there is no need for cutting, and the distribution of vibration amplitude can be adjusted very easily and easily.

(Structure of the invention and adjustment procedure) The invention is constructed as shown in FIGS. 5 and 6. That is, FIG. 5A is a front view (only the nut section is shown in cross section), and FIG. 5B is a bottom view. 6 is a nut, 7 is a bolt for mounting the nut, and 8 is a screw hole.

Screw hole 8 provided on the top surface of plate horn 2
A bolt 7 is attached to the bolt 7, nuts 6 with various thicknesses t are prepared, nuts with different thicknesses are tightened to the bolt 7, and the added mass is varied to adjust the distribution of vibration amplitude. Find the mass that gives the flattest amplitude characteristics and fix the nut.

(Experimental results) The configuration shown in Figures 5 and 6, using duralumin as the material, has a width of approximately 150 mm and a depth of approximately 35 mm.
Fig. 7 shows the results of an experiment in which nuts of varying thickness were attached to a plate horn having dimensions of 100 mm and 100 mm in height.

The displacement on the vertical axis was divided by the maximum value and expressed as a percentage. t
As the value of t is changed from t = 0 to 8 mm and 12 mm, the mountainous distribution gradually becomes a flat distribution, and t
It can be seen that at = 14 mm, the mountain-like distribution, that is, the convex stripe, reverses to a dish-like distribution, and then as t increases from 16 to 18, the displacement increases.

From the above experimental results, it can be estimated that it would be sufficient to add a mass of t=13 mm.

(Effects of the invention) The amplitude distribution of the vibration surface can be easily adjusted by replacing the nut, and the work is easier compared to the conventional method of shaving off the horn. Accidents that render the product useless will never occur.

[Brief explanation of the drawing]

Figure 1 shows an overview of conventionally used vibrators. 1... Vibration horn, 2... Plate horn, 3
...End face, 4...Vibration direction, 5...Slot Figure 2 shows the distribution of vibration amplitude on the end face of Figure 1. FIG. 3 is an explanatory diagram of a state in which the amplitude is removed to make the distribution uniform. FIG. 4 is a diagram showing that the vibration amplitude of the vibration surface is almost constant. FIG. 5 and FIG. 6 are diagrams showing the configuration of the embodiment. 6...Nut, 7...Bolt, 8...Screw hole. FIG. 7 shows an example of the experimental results.

Claims (1)

[Scope of utility model registration request] The plate horn is a resonant type plate horn in which the dimensions between an input surface and an output surface formed on the opposite side thereof are determined to resonate by a half wavelength for a predetermined vibration frequency, and the has a means for applying vibration of a predetermined frequency, and screws are installed near both ends facing each other across the means for applying vibration, and the screw is used for adjusting the vibration amplitude of different masses. 1. A horn having vibration amplitude adjusting means, characterized in that the nut is configured to be selectively attached and detached.