JPS6135931B2 - - Google Patents

Abstract

PURPOSE:To prevent overlook or mistake of the operator and enable automation of the process management by measuring the intensity and time of a current flowing into a ultrasonic wave oscillator to discriminate the working condition of a ultrasonic wave welding device. CONSTITUTION:A current is introduced into a current level discriminating circuit 3 and a current application time discriminating circuit 4, respectively, and the circuit 3. When the introduced current largely exceeds the upper limit level value, the circuit 3 emits a signal a to suitability of quality discriminating circuit 5, and when the current is in appropriate range, the circuit 3 emit a signal b. When the current is extremely small, the circuits 3 emits a signal c to the above circuit 5. On the other hand, the circuit 4 emits signals d, e and f to the above described circuit 5, respectively, when the introduced current 4 is extremely small, appropriate or excessively large. When signals b and e which are in the appropriate range, are simultaneously delivered to the circuit 5, an output signal of ''good'' is emitted, and in other cases, an output signal of ''no'' is emitted. The output signal of ''good'' or ''not'' emitted from the suitability of quality discriminating circuit 5 is sent to an automatic deposited matter carrier. In the case of the ''no'' signal, incomplete deposited matters are carried to the succeeding step.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a working condition monitoring device for an ultrasonic welding device.

Ultrasonic welding equipment for welding thermoplastic synthetic resin materials such as styrene is composed of an ultrasonic oscillator and a processing machine, and conventionally the working status has been monitored by visually observing changes in the ammeter attached to the ultrasonic oscillator. This was done by checking the finished product visually. However, this requires the worker to be near the ultrasonic oscillator or processing machine and constantly monitor it, and when working continuously for long periods of time, fatigue is high, and oversights and mistakes are likely to occur. This was a major cause of delays in automating process control.

The present inventor focused on the fact that there is a correlation between the magnitude and time of the current flowing into the vibrator of an ultrasonic oscillator and the quality of welding of the workpiece welded by the processing machine, and determined that the magnitude of the inflow current We have developed and proposed a monitoring device that measures time, automatically determines the working status of an ultrasonic welding device, and outputs a pass/fail signal.

Before explaining the structure of the present invention, the correlation between the welding operation of the ultrasonic welding device and the current flowing into the ultrasonic oscillator will be explained. Too little or too little inflow current or too little or too little application time will both cause poor welding, and if the ultrasonic vibrator is defective or there is an abnormality in processing pressure, the inflow current may become larger or smaller than the appropriate value.

In other words, if the inflow current is excessive, the welded material may melt too much, resulting in defective dimensions of the welded material, poor airtightness, etc., if the inflow current is excessive, and if the applied current is excessive, cracks may occur or melting may occur in areas other than the welded part. On the other hand, if the inflow current is too low or the application time is too short, insufficient melting of the welded part, poor dimensions of the welded material due to insufficient melting, insufficient airtightness, etc. will occur, and in these cases, normal Welding work cannot be performed.

Figure 1 is a graph depicting the waveform of the inflow current, with the level of the inflow current on the vertical axis and the application time on the horizontal axis. In the figure, A is the lower limit level of the inflow current, B is the upper limit level of the inflow current, and C indicates the predetermined minimum application time limit point, D indicates the maximum application time limit point, and in the figure, A indicates that the inflow current is below the appropriate level, and B indicates that the welding work is defective because it is above the appropriate level. d indicates that the welding work is defective due to insufficient application time. On the other hand, C indicates that the inflow current is within an appropriate level, the application time is appropriate, and the welding work is being performed normally. The present invention automatically determines the quality of the welding work by detecting the magnitude and application time of this inflow current,
It is intended to output a pass/fail signal. Hereinafter, the configuration will be explained in detail based on an embodiment of the present invention shown in the drawings.

1 is an ultrasonic oscillator, and 2 is a processing machine that performs welding work using the energy sent from the ultrasonic oscillator 1. The ultrasonic oscillator 1 and processing machine 2 constitute an ultrasonic welding device 7. There is. In addition,
The ultrasonic welding device 7 in this embodiment has an output of
500W, oscillation frequency 18KHz, pressure force 10Kg.
3 obtains a signal output from the ultrasonic oscillator 1,
This is a current level determination circuit that determines the current flowing into the vibrator of the ultrasonic oscillator 1, sets upper and lower limit levels, and determines whether the current is within the range or outside the range. 4 is a current application time determination circuit that similarly obtains the signal output from the ultrasonic oscillator 1 and determines the application time of the current flowing into the vibrator of the ultrasonic oscillator 1. The maximum and minimum time is set, and the time is within this range. This is used to determine that the value is out of range. Reference numeral 5 denotes a pass/fail judgment circuit which receives signals from the current level judgment circuit 3 and the current application time judgment circuit 4 and judges whether the welding work condition is good or bad, and outputs a pass/fail signal. The ultrasonic welding device 7 in the embodiment is used to weld a styrene lid to a styrene tank immediately after liquid is filled therein so as to keep it airtight, but if a thermoplastic synthetic resin material is to be welded, However, it is not limited to this.

This invention has the above-mentioned configuration, in which current is sent from the ultrasonic oscillator 1 to the current level determination circuit 3 and the current application time determination circuit 4, and in the current level determination circuit 3, the inflow current reaches the upper limit level. (B in Figure 1), determines whether it is within the range of the lower limit level (A in Figure 1),
If the level is greater than the upper limit level, a signal a is sent to the pass/fail judgment circuit 5, if it is within the proper range, a signal b is sent, and if it is less than the upper limit level, a signal c is sent to the pass/fail judgment circuit 5.

On the other hand, the current application time determination circuit 4 outputs a d signal if the inflow current application time is too short, and an e signal if the inflow current application time is appropriate.
If the signal is excessive, an f signal is sent to the pass/fail judgment circuit 5, respectively. The pass/fail determining circuit 5 outputs a pass output signal when the b signal and e signal within the proper range are input at the same time, and outputs a fail output signal in all other cases. And this pass/fail judgment circuit 5
The pass/fail output signal emitted from the device is sent to an automatic weld material transfer machine (not shown) outside of this device, and in the case of a fail output signal, incomplete weld material is discharged without being transported to the next process. It's getting old. It is also possible to send this output signal indicating whether the welding process is good or not to a recording circuit (not shown) outside the apparatus to continuously record the welding work status.

This invention has the above-mentioned configuration and operation, and automatically and accurately monitors whether the ultrasonic oscillator is operating normally and whether or not the welding work of the workpiece by the processing machine is being performed normally. It is possible to prevent workers from overlooking or making mistakes.
It has an excellent effect that can contribute to automation of process control.

[Brief explanation of the drawing]

FIG. 1 is a graph depicting the waveform of the current flowing into the ultrasonic oscillator, and FIG. 2 is a block diagram of an embodiment of the present invention. Further, in the figure, 1 represents an ultrasonic oscillator, 2 a processing machine, 3 a current level determination circuit, 4 a current application time determination circuit, and 5 a quality determination circuit.

Claims (1)

[Claims] 1 A current level determination circuit 3 that determines whether the value of the current actually flowing into the ultrasonic oscillator 1 of the ultrasonic welding device 7 is within a range of appropriate current values and outputs the result; A current application time determination circuit 4 that determines whether or not the current application time to the sound wave oscillator 1 is within a predetermined appropriate application time range and outputs the result; the current level determination circuit 3; It is characterized by comprising a quality judgment circuit 5 which receives the signal from the current application time judgment circuit 4 and judges whether the signals from both judgment circuits 3 and 4 are both within an appropriate range. Work status monitoring device for ultrasonic welding equipment.