JPH03275179A - Ultrasonic working device - Google Patents

Abstract

PURPOSE:To allow oscillation while a node position is held fixed even if a tool, etc., are exchanged by analyzing the natural oscillation frequency over the entire part of an oscillation system and driving the oscillation system with the waveforms including up to the natural oscillation frequency components of higher orders by the result of the analysis. CONSTITUTION:The voltage of a square waveform is outputted from a waveform generator 1. The output from the waveform generator 1 is amplified by a wide band amplifier 2 to drive the entire part of the driving system. The output (voltage and current) of the wide band amplifier 2 is sampled by a waveform analyzer 4 and a transmission function (impedance curve) is determined from the voltage and current waveform. The waveform synthesized of the resonance frequency up to the highest possible order is computed by a computer 5 from the transmission function determined by the waveform analyzer 4. A series of the above-mentioned working are executed every time when certain conditions, such as specified time or specified working amt., are satisfied. The waveform computed by the computer 5 is outputted to the waveform generator 1 to drive the entire part of the oscillation system. Consequently, the oscillation is possible in this way while the node position is held fixed even if the tool, etc., are exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ultrasonic machining device that performs ultrasonic machining using ultrasonic vibrations.

[Prior Art] Fig. 3 is a block diagram of a conventional ultrasonic processing device, in which (1) is an oscillator, (2) is an amplifier connected to the output of this oscillator (1), and (3) is an amplifier connected to the output of this oscillator (1). is a vibration conversion element driven by the output of the amplifier (2), and (7) is a vibration conversion element (
3), this first horn (7) being fixed with a flange (8). The first horn (
A second horn (9) is further attached to the tip of the horn (9), and a tool (10) is attached to the tip of the horn (lO).
The workpiece (12) is machined. (11) is an abrasive grain between the tool (lO) and the workpiece (12).

The conventional device is configured as described above, and its operation will be explained next. In order to generate ultrasonic waves, an oscillator (1
) is amplified by the amplifier (2), and the vibration conversion element (3) is driven. The vibrations generated therein are transmitted to the horns (7) and (9), causing the tool (10) to vibrate and machining to proceed via the abrasive grains (11). In this case, vibration is transmitted and amplitude expanded to the horns (7) and (9). This device is usually fixed via a flange (8) at one node of the vibration system (a location where the amplitude does not fluctuate).

“Problem to be solved by the invention” A conventional ultrasonic processing device is configured as described above.
As shown in Figure 3, a node, which is usually a fixed point, is supported, but the tool (10) or the tool (10) and the horn (
If you replace 7) and (9), the natural frequency of the entire vibration system will change, and the position of the supported node (fixed point) will change.
There was a problem in that it supported the vibration point and interfered with the vibration.

This invention was made to solve the above-mentioned problems, and it is an ultrasonic machining device that can fix the supported point to the node even if the tool (■0) is converted, and the vibration will not be disturbed. The purpose is to obtain.

[Means to solve the problem]

The ultrasonic machining apparatus according to the present invention analyzes the natural frequency of the entire vibration system, and based on the result, drives the vibration system with a waveform that includes natural vibration components of harmonics.

[Effect]

Since the ultrasonic machining apparatus according to the present invention is driven with a waveform that includes even high frequency components, the position of the node can be arbitrarily set, and the node can always be the supporting point.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is a waveform generator (3) that generates an arbitrary waveform, (2) is a wideband amplifier connected to the output of the waveform generator (1), (4) is a waveform analyzer, ( 5) is a computer that controls the waveform generator (1) based on the analysis results of the waveform analyzer (4)). The other parts of the apparatus according to the embodiment of the present invention are constructed as described above, and the operation thereof will be explained next.

The impedance curve of the entire vibration system of the device according to one embodiment of this invention is as shown in Figure 2, and the one that is not fixed with the flange (8) has a sharper first-order resonance than the one that is fixed, and only the first-order resonance frequency is sufficient. It vibrates.

However, if the flange (8) is fixed, the -order resonance becomes sharp and vibration cannot be achieved sufficiently. Therefore, sufficient vibration can be obtained by driving the entire vibration system with a waveform that combines secondary and higher resonance frequencies.

Therefore, first, a rectangular waveform voltage is output from the waveform generator (1). The output from the waveform generator (1) is amplified by a broadband amplifier (2) to drive the entire vibration system.

At that time, the output (voltage, current) of the broadband amplifier (2) is sampled by the waveform analyzer (4), and a transfer function (impedance curve) is determined from the voltage and current waveforms (4). The waveform that synthesizes the resonance frequencies up to the highest possible order from the transfer function obtained with the waveform analyzer [4] is calculated using the computer (5).
Calculate with.

The above-mentioned series of processes is performed every time a certain condition such as a certain amount of machining is satisfied for a certain period of time or a certain amount of processing, and the waveform calculated by the computer (5) is outputted to the waveform generator [1] to drive the entire vibration system.

In the above embodiment, a wide attenuation amplifier is used, but an inverter power supply may also be used, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, the frequency of the entire vibration system is analyzed, and based on the results, it is configured to be driven with a waveform that includes harmonic resonance frequency components. Even if tools, horns, etc. are replaced, the node position remains fixed and vibrations can be obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an ultrasonic machining device according to an embodiment of the present invention, Fig. 2 is a diagram showing an impedance curve of the entire vibration system of this inventive device, and Fig. 3 is a diagram showing a conventional ultrasonic processing device. FIG. In the figure, (1) is a waveform generator, (2) is a wideband amplifier, (
3) is a vibration conversion element, (4) is a waveform analyzer, (5) is a computer, (7) is a horn, (8) is a flange, (lO) is a tool, (11) is an abrasive grain, (12) is a It is the workpiece. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] An ultrasonic machining device characterized by analyzing the natural frequency of the entire vibration system and driving the vibration system with a waveform that includes even higher-order natural frequency components based on the analysis results.