JPH0421579B2 - - Google Patents

Description

[Detailed description of the invention] purpose of invention (Technical field) This invention relates to an ultrasonic processing machine.

(Prior Art) Conventionally, when setting one machining cycle in an ultrasonic processing machine, the ultrasonic application time and the machining holding time after the ultrasonic wave is stopped are set in advance. When the start switch is operated to start one machining cycle, the machining horn first moves downward (forward).
When the machining hoe moves forward and comes into contact with the workpiece, it pressurizes the workpiece through the machining horn and applies ultrasonic waves to the machining horn for a preset ultrasonic duration. After the application time has elapsed, the ultrasonic vibration is stopped, and after the workpiece is held under pressure for the pressure holding period, the processing horn is moved upward (backwards) to complete one processing cycle. I was getting used to it.

(Problems to be Solved by the Invention) However, since the ultrasonic application time and the pressure holding time are set in advance, machining may be insufficient due to fluctuations in the tip vibration of the machining horn and machining pressure.
On the other hand, problems such as excessive machining and poor machining have occurred.

The object of the present invention is to provide an ultrasonic processing machine that can always perform stable machining without machining defects by adopting a method different from the conventional method described above.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention provides an ultrasonic processing machine that processes a workpiece by applying vibration to a processing horn using an ultrasonic application means. , a reciprocating drive means for reciprocating the processing horn toward the workpiece, and a contact detection means for detecting that the processing horn has contacted the workpiece and generating a detection signal. and a movement amount detection means for detecting the movement amount of the processing horn,
Applying ultrasonic vibration to the processing horn based on the detection signal of the contact detection means, and after the processing horn is moved by a preset movement amount from the time when the detection signal of the contact detection means is generated, The gist of the present invention is an ultrasonic machining machine comprising the ultrasonic applying means and a control means for controlling the reciprocating drive means so as to return the machining horn.

(Function) The machining horn is reciprocated toward the workpiece by a reciprocating drive means. On the other hand, the contact detection means detects that the machining horn has come into contact with the workpiece, and the movement amount detection means detects the amount of movement of the machining horn.

The control means applies ultrasonic vibration to the machining horn based on the detection signal of the contact detection means, and also preliminarily applies ultrasonic vibration to the processing horn based on the detection amount of the movement amount detection means from the time when the detection signal of the contact detection means is generated. It is determined that the machining horn has been moved by a set amount of movement, and the ultrasonic wave applying means and the reciprocating drive means are controlled to return the machining horn based on the determination result.

(Embodiment) A preferred embodiment embodying the present invention will be described below with reference to the drawings.

In Figure 1, the bed 1 has a support post 2 on its rear side.
is erected, and a frame 3 is supported by the pillar 2. A jig 4 is provided on the bed 1, and workpieces 5 and 6 made of plastic material are placed on the jig 4. An air cylinder 7 as a reciprocating drive means is mounted and fixed on the upper side of the frame 3. The piston rod 7a of the engine cylinder 7 is reciprocated in the vertical direction by the switching operation of the electromagnetic switching valve 8.

The movable body 9 is connected and fixed to the piston rod 7a, and is reciprocated in the vertical direction by the piston rod 7a. The machining horn 10 has a flange supported by the movable body 9, and a vibrator 11 as an ultrasonic wave applying means is coupled to the upper end thereof. Then, by moving the piston rod 7a of the air cylinder 7 downward, the machining horn 10 is brought into contact with the workpieces 5 and 6, and the vibrator 11 causes the machining horn 10 to vibrate ultrasonically. 5 and 6 are subjected to ultrasonic processing.

A pressure sensing switch 12 as contact detection means is attached to the air cylinder 7 and detects whether or not the machining horn 10 has contacted the workpieces 5, 6. The pressure sensing switch 12 detects when the pressure inside the air cylinder 7 reaches a preset pressure, that is, when the machining horn 10 comes into contact with the workpieces 5 and 6, the load applied to the piston rod 7a increases. It is designed to operate when the pressure inside the air cylinder 7 increases.

The frame 3 is provided with a linear scale 13 as a movement amount detection means, and a fixed rod 13a on the side thereof is provided.
is engaged with a contact plate 14 provided on the movable body 9, and the movable body 9, that is, the machining horn 10 is moved downward based on the amount of downward movement of the measuring rod 13a pushed down by the contact plate 14. Detect the amount of movement. The linear scale 13 is configured to output one pulse signal each time the measuring rod 13a moves by a predetermined amount. In this embodiment, the linear scale 13 is set in advance so that the contact plate 14 provided on the movable body 9 engages with the measuring rod 13a of the linear scale 13 immediately before the processing horn contacts the workpieces 5 and 6. The amount of downward movement of the machining horn 10 is detected from the time it comes into contact with the workpieces 5 and 6.

Note that a start switch 15 for starting machining is provided on the front side of the bed 1.

Next, the electric circuit of the ultrasonic processing machine configured as described above will be explained.

In FIG. 2, a valve drive circuit 16 is a circuit that switches and controls the electromagnetic switching valve 8, and lowers the piston rod 7a of the air cylinder 7, that is, the machining horn 10, in response to an ON signal from the start switch 15. The electromagnetic switching valve 8 is controlled to move the machining horn 10 upward (backward motion) in response to a machining end signal SG2, which will be described later. The one pulse generating circuit 17 generates one pulse in response to an output signal output from the pressure sensing switch 12 when the pressure sensing switch 12 is activated, that is, when the machining horn 10 comes into contact with the workpieces 5 and 6. The pulse signal SG1 is outputted to the next stage flip-flop circuit (hereinafter referred to as FF circuit) 18. FF
The circuit 18 is set in response to the pulse signal SG1 and outputs a drive control signal for driving the vibrator 11. Conversely, when the FF circuit 18 is reset, it outputs a drive control signal to stop driving the vibrator 11.

The waveform shaping circuit 19 shapes the waveform of the pulse signal output from the linear scale 13 and outputs it to the counter 20 at the next stage. The counter 20 counts the pulse signals outputted from the waveform shaping circuit 19, and resets its contents in response to the pulse signal SG1 outputted from the one-pulse generation circuit 17. Therefore, the content of the counter is the amount of movement of the machining horn 10 detected via the linear scale 13.

When the workpieces 5 and 6 are subjected to ultrasonic processing using the processing horn 10, the dimensional change amount setting device 21 moves downward while being pressed from the time when the horn 10 comes into contact with the workpieces 5 and 6. It is a setting device for setting the optimum amount of movement at the time, and its setting dial is provided at a position adjacent to the activation switch 15.

The comparator 22 inputs the data of the optimum movement amount set by the dimensional change amount setter 21 and the contents of the counter 20 (actual movement amount of the machining horn 10).
Compare both data. Then, the comparator 22 outputs a machining end signal SG2 when the actual amount of movement of the machining horn 10 becomes the same as the optimum amount of movement. The processing end signal SG2 is output as a reset signal to the FF circuit 18, and resets the FF circuit 18. Therefore, the FF circuit 18 outputs a drive control signal for stopping the drive of the vibrator 11.
Further, the processing end signal SG2 is sent to the valve drive circuit 1.
6 is output. And the same valve drive circuit 16
The electromagnetic switching valve 8 is switched to move the machining horn 10 back.

Next, the operation of the ultrasonic processing machine configured as described above will be explained.

Now, when the start switch 15 is operated, the valve drive circuit 16 switches the electromagnetic switching valve 8 in response to the ON signal of the switch 15, drives the air cylinder 7, and moves the machining horn 10 to the workpieces 5 and 6. move towards When the machining horn 10 comes into contact with the workpieces 5 and 6, the pressure sensing switch 12 is activated. In addition, the one-pulse generating circuit 17 outputs one pulse signal SG1 to the FF circuit 18 in response to the operation of the pressure sensing switch 12 to set the FF circuit 18, and outputs it to the counter 20 to read the contents of the counter. to reset state.

The FF circuit 18 in the set state is connected to the vibrator 11.
The workpiece 5, is driven by the processing horn 10.
6. Start ultrasonic processing. Meanwhile, at the same time, the reset counter 20 starts counting the amount of movement of the machining horn 10 from the point of contact with the workpieces 5 and 6 based on the pulse signal output from the linear scale 13. .

Then, when the ultrasonic machining progresses and the comparator 22 determines based on the contents of the counter 20 that the machining horn 10 has moved by the optimum movement amount set by the dimensional change amount setter 21, the comparator 22 End signal SG2 is sent to FF circuit 18 and valve drive circuit 1
Output to 6.

The FF circuit 18 is reset based on this machining end signal SG2 and stops driving the vibrator 11.
Meanwhile, at the same time, the valve drive circuit 16 switches the electromagnetic switching valve 8 to move the machining horn 10 back.

When the machining horn 10 reaches the highest position, the ultrasonic machining machine completes one machining cycle and waits for the next activation of the start switch 15.

As described above, in this embodiment, the ultrasonic vibration is stopped from the time when the machining horn 10 comes into contact with the workpieces 5, 6 according to the dimensional change (optimum movement amount) of the workpieces 5, 6 due to machining. Moreover, since the machining horn 10 is made to move backward, there is no variation in machining caused by fluctuations in the vibration/amplitude of the ultrasonic vibrations or fluctuations in the pressure applied to the workpieces 5 and 6. , stable machining can be performed at all times.

Effects of the Invention As described above, according to the present invention, the ultrasonic vibration is stopped when the machining horn has moved a predetermined amount of movement from the time when it comes into contact with the workpiece, and the machining horn is made to move back. Because the vibration of ultrasonic vibration
There is no variation in machining caused by fluctuations in amplitude or fluctuations in pressure applied to the workpiece, and it has the excellent effect of always being able to perform stable machining.

[Brief explanation of drawings]

FIG. 1 is a side view of an ultrasonic processing machine embodying the present invention, and FIG. 2 is an electric block circuit diagram. In the figure, 5 and 6 are workpieces, 7 is an air cylinder,
8 is an electromagnetic switching valve, 9 is a movable body, 10 is a processing horn, 11 is a vibrator, 12 is a pressure sensing switch, 13 is a linear scale, 16 is a valve drive circuit 17 is a 1-pulse generation circuit, 18 is a flip-flop circuit, 20 is a counter, 21 is a dimensional change amount setter, and 22 is a comparator.

Claims (1)

[Scope of Claims] 1. In an ultrasonic processing machine that processes workpieces 5 and 6 by applying vibration to a processing horn 10 by an ultrasonic wave application means 11, the processing horn 10 is applied to the workpieces 5 and 6. a reciprocating drive means 7 for reciprocating the processing horn 10 toward the workpieces 5 and 6; a contact detection means 12 for detecting that the processing horn 10 has contacted the workpieces 5 and 6 and generating a detection signal; A movement amount detection means 13 for detecting the movement amount of the processing horn 10; and an ultrasonic vibration is applied to the processing horn 10 based on a detection signal from the contact detection means 12; A control means 16 for controlling the ultrasonic wave applying means 11 and the reciprocating drive means 7 so as to return the machining horn 10 after the machining horn 10 has been moved by a predetermined amount of movement since the detection signal is generated. Ultrasonic processing machine equipped with 22 etc.