JPH07266421A - Method and device for ultrasonic welding - Google Patents

Abstract

PURPOSE:To reduce a time to start a welding operation to enhance a working efficiency by a method wherein an ultrasonic horn part is so controlled as to move at a relatively high speed just before a tool horn abuts against a work and move at a relatively low speed while applying a predetermined pressure to the work in a period of time from just before the contact to the contact. CONSTITUTION:Under the control of a main controller 7 based on a position sensor 13, when a top of a tool horn 6c of an ultrasonic horn part 6 exists in an area H1 with respect to a work W, air is supplied into an air cylinder 5 through pipes 17, 22, a change-over valve 12, a pipe 20, a first speed controller 9, and a pipe 18, and the ultrasonic horn part 6 is controlled by the first speed controller 9 so as to be lowered at a high speed. Next, when the top of the tool horn 6c is moved into an area H2, air is supplied from the change-over valve 12 through a pipe 21, a second speed controller 10, a pipes 19, and the pipe 18, and the ultrasonic horn part 6 is controlled by the second speed controller 10 so as to be lowered at a low speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic welding method and an apparatus therefor, and more particularly, to an ultrasonic welding method suitable for varying the transfer speed of a tool horn of an ultrasonic horn section to a workpiece. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, when performing processing by ultrasonic welding, an ultrasonic horn portion having a tool horn connected to an ultrasonic transducer through a booster, and an air cylinder for driving the ultrasonic horn portion up and down. In general, an ultrasonic welding device including a control unit (speed controller) that controls the amount of movement of the air cylinder (the descending speed of the ultrasonic horn unit), a support that supports the ultrasonic horn unit and the air cylinder, and the like. Is used for.

When performing ultrasonic welding on a workpiece placed on a base by the ultrasonic welding apparatus, the controller controls the air cylinder to drive the ultrasonic horn above the base. To the object to be descended while maintaining a constant speed, and by applying a predetermined static pressure to the object to be descended by the tool horn of the ultrasonic horn and operating the ultrasonic horn, It was supposed to be welded.

[0004]

However, in the above-mentioned conventional ultrasonic welding apparatus, the control unit controls the driving of the air cylinder to lower the ultrasonic horn unit at a constant speed. Therefore, the descending speed (moving speed) of the ultrasonic horn until the tip of the tool horn of the ultrasonic horn contacts the work piece and the ultrasonic velocity after the tip of the tool horn contacts the work piece It was not possible to freely adjust the descending speed (processing speed) of the sonic horn section.

Therefore, in order to improve the work efficiency of ultrasonic welding, when the moving speed of the ultrasonic horn part is lowered at a constant speed, the tip of the tool horn of the ultrasonic horn part is the work piece. Although the moving time of the ultrasonic horn portion until contacting with can be shortened, on the other hand, since the processing speed of the ultrasonic horn portion after the tip of the tool horn contacts the workpiece is too high, for example, When the upper work piece was inserted into the lower work piece placed on the base, it became a press fit state, resulting in a decrease in the adhesion strength of both work pieces, resulting in a defective product. .

On the other hand, in order to perform ultrasonic welding in a proper state, when the moving speed of the ultrasonic horn part is lowered at a constant speed, the tip of the tool horn of the ultrasonic horn part is processed. The processing speed of the ultrasonic horn after contact with the blade can be maintained at an appropriate speed, but on the other hand, the moving time of the ultrasonic horn until the tip of the tool horn contacts the workpiece increases. Therefore, there is a problem that work efficiency is reduced.

[0007]

It is an object of the present invention to improve the disadvantages of the above conventional example, and in particular, by changing the transfer speed of the tool horn before and after the contact of the tool horn of the ultrasonic horn with the workpiece. It is an object of the present invention to provide an ultrasonic welding method and an apparatus therefor, which also aims at improving work efficiency while appropriately performing ultrasonic welding.

[0008]

According to a first aspect of the present invention, an ultrasonic horn portion having a tool horn to which ultrasonic vibration is transmitted is transferred toward a workpiece, and the tool horn is processed by the workpiece. In the ultrasonic welding method in which the ultrasonic welding is carried out by pressing the workpiece into contact with the workpiece, the transfer speed of the ultrasonic horn is relatively high until just before the tool horn contacts the workpiece. First to control so that
And the process from immediately before the tool horn comes into contact with the work piece until it comes into contact with the work piece while controlling the transfer speed of the ultrasonic horn part to be a relatively slow transfer speed while applying a predetermined pressure to the work piece. And a second step of performing. This is intended to achieve the above-mentioned object.

According to a second aspect of the present invention, an ultrasonic horn portion having a tool horn to which ultrasonic vibrations are transmitted is moved toward a work piece, and the tool horn is pressed against the work piece. In the ultrasonic welding method in which the ultrasonic welding is at least performed, the transfer speed of the ultrasonic horn is controlled to be a relatively high transfer speed until just before the tool horn contacts the workpiece. After the first step and the contact of the tool horn with the workpiece, the ultrasonic horn portion is controlled to have a relatively slow transfer speed while applying a predetermined pressure to the work. The second step is used. This is intended to achieve the above-mentioned object.

According to a third aspect of the present invention, there is provided an ultrasonic horn part having an ultrasonic vibrator and a tool horn mounted on the ultrasonic vibrator via a booster, and the ultrasonic horn attached to the ultrasonic horn part. The transfer speed of the ultrasonic horn section by the horn transfer pressurizing section for transferring the horn section toward the work piece and pressing the tool horn against the work piece under pressure, and the transfer speed of the ultrasonic horn section by the horn transfer pressurizing section In an ultrasonic welding device having a control unit for controlling, a position sensor for detecting that the tip of the tool horn has reached a predetermined position near the processing point is provided in the vicinity of the ultrasonic horn unit, and the control unit But,
It operates based on the information detected by the position sensor, and is controlled so that the transfer speed of the ultrasonic horn unit by the horn transfer pressurizing unit is relatively high until just before the tool horn contacts the workpiece. , The ultrasonic horn section is operated by the horn transfer pressurizing section while applying a predetermined pressure to the work piece from immediately before the tool horn comes into contact with the work piece until it comes into contact with the work piece based on the detection information of the position sensor. The transfer speed control function is provided to control the transfer speed to be a relatively low transfer speed. This is intended to achieve the above-mentioned object.

According to a fourth aspect of the present invention, there is provided an ultrasonic vibrator having an ultrasonic vibrator and a tool horn mounted on the ultrasonic vibrator via a booster, and the ultrasonic horn attached to the ultrasonic horn. The transfer speed of the ultrasonic horn section by the horn transfer pressurizing section for transferring the horn section toward the work piece and pressing the tool horn against the work piece under pressure, and the transfer speed of the ultrasonic horn section by the horn transfer pressurizing section In an ultrasonic welding device having a control unit for controlling, a position sensor for detecting that the tip of the tool horn has reached a predetermined position near the processing point is provided in the vicinity of the ultrasonic horn unit, and the control unit But,
It operates based on the information detected by the position sensor, and is controlled so that the transfer speed of the ultrasonic horn unit by the horn transfer pressurizing unit is relatively high until just before the tool horn contacts the workpiece. After the tool horn comes into contact with the work piece by operating based on the detection information of the position sensor, the transfer speed of the ultrasonic horn section by the horn transfer pressurizing section is increased while applying a predetermined pressure to the work piece. The transfer speed control function for controlling the transfer speed to be relatively slow is provided. This is intended to achieve the above-mentioned object.

[0012]

According to the first aspect of the present invention, first, in the first step, the transfer speed of the ultrasonic horn is relatively high until just before the tool horn contacts the workpiece. To control. Next, in the second step, from just before the tool horn abuts the workpiece to the time it abuts,
The transfer speed of the ultrasonic horn unit is controlled to be a relatively low transfer speed. That is, the transfer speed of the ultrasonic horn unit is varied immediately before the tool horn contacts the workpiece and immediately before the tool horn contacts the workpiece.

According to the second aspect of the present invention, first, in the first step, the transfer speed of the ultrasonic horn is relatively high until just before the tool horn contacts the workpiece. To control. Next, in the second step, after the tool horn comes into contact with the workpiece, the transfer speed of the ultrasonic horn unit is controlled to be a relatively low transfer speed.
That is, until just before the tool horn contacts the workpiece,
After the tool horn comes into contact with the workpiece, the transfer speed of the ultrasonic horn unit is changed.

According to the third aspect of the present invention, first, after fixing the workpiece to a predetermined position and then activating the ultrasonic welding apparatus, the horn transfer pressurizing unit is operated in accordance with the operation of the ultrasonic welding apparatus. Moves the ultrasonic horn section toward a workpiece with a predetermined pressing force. At this time, the position sensor provided near the ultrasonic horn unit detects whether or not the tip of the tool horn of the ultrasonic horn unit has reached a predetermined position near the processing point. Based on the detection information from the position sensor, the control unit controls the transfer speed of the ultrasonic horn unit to be a relatively high transfer speed until just before the tool horn contacts the workpiece. Next, based on the detection information of the position sensor, the control unit drives and controls the horn transfer pressurizing unit from immediately before the tool horn abuts the workpiece to the time when the tool horn abuts the workpiece. While applying pressure, the transfer speed of the ultrasonic horn unit is controlled to be a relatively low transfer speed. That is, the control unit variably controls the transfer speed of the ultrasonic horn unit by dividing it into a section from immediately before the tool horn comes into contact with the workpiece and from just before the tool horn comes into contact with the workpiece. To do.

According to the fourth aspect of the present invention, first, after fixing the workpiece to a predetermined position and then activating the ultrasonic welding apparatus, the horn transfer pressurizing unit is operated in accordance with the operation of the ultrasonic welding apparatus. Moves the ultrasonic horn section toward a workpiece with a predetermined pressing force. At this time, the position sensor provided near the ultrasonic horn unit detects whether or not the tip of the tool horn of the ultrasonic horn unit has reached a predetermined position near the processing point. Based on the detection information from the position sensor, the control unit controls the transfer speed of the ultrasonic horn unit to be a relatively high transfer speed until just before the tool horn contacts the workpiece. Next, based on the detection information of the position sensor, the control unit drives and controls the horn transfer pressurizing unit to apply a predetermined pressure to the work piece by the tip of the tool horn after the tool horn contacts the work piece. Meanwhile, the transfer speed of the ultrasonic horn unit is controlled to be a relatively low transfer speed. That is, the control unit variably controls the transfer speed of the ultrasonic horn unit by dividing into a section before the tool horn abuts the workpiece and a section after the tool horn abuts the workpiece.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first and second embodiments to which the ultrasonic welding method and apparatus of the present invention are applied will be described below with reference to the drawings.

(1) First embodiment. FIG. 1 shows the configuration of the ultrasonic welding apparatus in the first embodiment. In the first embodiment, for example, a cylindrical first cover placed on the upper surface of a base 1 of the ultrasonic welding apparatus. Workpiece W1
In this example, the case where the disk-shaped second workpiece W2 having a shape that fits into the opening W1a is fixed by ultrasonic welding to the opening W1a.

The ultrasonic welding apparatus in the first embodiment is
An air cylinder 5 that is firmly fixed to a column 2 that is erected on the upper part of the base 1 via mounting members 3, auxiliary mounting members 4a and 4b, bolts 4c, and the like, and an ultrasonic horn that is connected to the air cylinder 5. The part 6, the main controller 7, the exhaust speed controller 8, the first speed controller 9, the second speed controller 10, the up / down valve 11, the switching valve 12, the position sensor 13, and the oscillation circuit 23. And so on.

More specifically, the air cylinder 5 comprises an air cylinder body 5a and a rod 5b, and an ultrasonic horn portion 6 is fixed to the lower end of the rod 5b. The ultrasonic horn unit 6 includes an ultrasonic vibrator 6a that generates ultrasonic vibration based on a high-frequency current supplied from the oscillation circuit 23 via a lead wire 6e, and an ultrasonic vibrator 6a.
The booster 6b is connected to a and the tool horn 6c is connected to the booster 6b. The ultrasonic transducer 6a and the booster 6b are housed inside the case 6d, and the detected piece 14 is attached to the outer peripheral surface of the case 6d.

A position sensor 14 is provided in the vicinity of the ultrasonic horn portion 6, and when the ultrasonic horn portion 6 is lowered from the original position shown by the air cylinder 5 as described later, the position sensor 14 is placed. Detects the detected piece 14 attached to the ultrasonic horn section 6 and outputs a detection signal to the main controller 7
It is designed to output to. Further, the first work W1 is placed on the upper surface of the base 1, and the upper part of the first work W1 is inserted into the hole W1a of the first work W1. The second workpiece W2 to be processed is placed. That is, by the position sensor 14, the tip of the tool horn 6c of the ultrasonic horn unit 6 has reached a predetermined position near the machining point (the position just before the tip of the tool horn 6c abuts the second workpiece W2). It is designed to detect

An exhaust speed controller 8 is connected to the air cylinder 5 through a pipe 15, and an ascending / descending switching valve 11 is connected to the exhaust speed controller 8 through a pipe 16 for ascending / descending. The lowering switching valve 11 is connected to an air supply source (not shown) via a pipe 17. The first speed controller 9 is connected to the air cylinder 5 via a pipe 18, and the second speed controller 10 is connected to the air cylinder 5 via a pipe 19 branched from the pipe 18. A switching valve 12 is connected to the speed controllers 9 and 10 via pipes 20 and 21. Furthermore, the switching valve 12 is connected to the up / down switching valve 11 via a pipe 22.

The exhaust speed controller 8 controls the exhaust of the air inside the air cylinder 5, and the air exhausted from the inside of the air cylinder 5 is connected to the pipes 15, 1.
6, the ascending / descending valve 11 and the pipe 17 are exhausted.

The opening of the air passage of the first speed controller 9 is set to be large, and by controlling the air pressure of the air cylinder 5, the ultrasonic horn portion 6 of the ultrasonic horn portion 6 is controlled through the rod 5b of the air cylinder 5. The ascending / descending operation is controlled. In the first speed controller 9, the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1 (the tool horn 6c moves from the original position to the second workpiece W2).
If it is within the range immediately before the contact with the contact point), the lowering speed of the ultrasonic horn section 6 by the air cylinder 5 is controlled based on a command from the main controller 7 so as to be a relatively fast lowering speed set in advance. It has become.

The opening of the air passage of the second speed controller 10 is set to be small, and the air cylinder 5
By controlling the air pressure of, the ascending / descending operation of the ultrasonic horn section 6 is controlled via the rod 5b of the air cylinder 5. When the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H2 (the range from immediately before the tool horn 6c contacts the second workpiece W2 to the contact), the second speed controller 10 operates Based on a command from the main controller 7, the descending speed of the ultrasonic horn unit 6 by the air cylinder 5 is controlled to be a preset relatively slow descending speed.

The main controller 7 outputs an ascending control signal to the ascending / descending valve 11 when raising the ultrasonic horn unit 6, and an ascending / descending valve 11 when descending the ultrasonic horn unit 6. It is designed to output to. As a result, when the ultrasonic horn portion 6 is raised, the raising / lowering valve 11 is controlled so that the air inside the air cylinder 5 is exhausted, and when the ultrasonic horn portion 6 is lowered, an air supply source is supplied to the inside of the air cylinder 5. The up / down valve 11 is controlled so that air is supplied from the.

Further, when the main controller 7 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the above-mentioned range H1 based on the detection signal of the position sensor 14, it switches the first speed controller selection signal. Valve 1
It is designed to output to 2.

As a result, when the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1, the pipes 17, 22, the switching valve 12, the pipe 20,
Since a path through which air is supplied from the air supply source is formed via the first speed controller 9 and the pipe 18,
The speed controller 9 controls the descending speed of the ultrasonic horn unit 6 to be a relatively high descending speed as described above.

On the other hand, when the main controller 7 determines based on the detection signal of the position sensor 14 that the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the above range H2, it switches the second speed controller selection signal. Valve 1
It is designed to output to 2.

As a result, when the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H2, the pipes 17, 22, the changeover valve 12, the pipe 21,
Since the path through which the air is supplied from the air supply source is formed through the second speed controller 10 and the pipes 19 and 18, the second speed controller 10 includes the air cylinder 5
To control the second workpiece W by the tool horn 6c.
While applying a predetermined pressure to 2, the descending speed of the ultrasonic horn section 6 is controlled to be a relatively slow descending speed as described above.

That is, the main controller 7 compares the descending speed of the ultrasonic horn unit 6 by the first speed controller 9 until just before the tool horn 6c of the ultrasonic horn unit 6 contacts the second workpiece W2. The horn 6c of the ultrasonic horn unit 6 is controlled by the second speed controller 10 until just before the tool horn 6c of the ultrasonic horn 6 contacts the second workpiece W2. It has a descending speed control function for controlling the descending speed to be a relatively slow descending speed.

Further, the main controller 7 outputs a control signal to the oscillation circuit 23 so that a high frequency current is sent from the oscillation circuit 23 to the ultrasonic horn section 6 via the lead wire 6e.
Is supplied to the ultrasonic transducer 6a. As a result, ultrasonic vibrations are generated in the ultrasonic vibrator 6a of the ultrasonic horn unit 6, and the ultrasonic vibrations are transmitted to the tool horn 6c via the booster 6b.

Next, the operation when ultrasonic welding is performed on a workpiece by the ultrasonic welding apparatus in the first embodiment having the above-mentioned structure will be described with reference to FIG.

First step. First, an operator fixes the cylindrical first workpiece W1 on the upper surface of the base 1 of the ultrasonic welding device via a jig (not shown), and at the same time, the disc-shaped second workpiece W1. The workpiece W2 is fitted into the opening W1a of the first workpiece W1.

Second step. Next, when the operator turns on the power source (not shown) of the ultrasonic welding device, the position sensor 14 near the ultrasonic horn unit 6
The detected piece 14 attached to the ultrasonic horn unit 6 is detected and a detection signal is output to the main controller 7. When the main controller 7 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1 based on the detection signal of the position sensor 14, the main controller 7 outputs the first speed controller selection signal to the switching valve 12.

Along with this, from the air supply source to the inside of the air cylinder 5, the pipes 17, 22, the switching valve 12, the pipe 20,
A path is formed through which the air is supplied from the air supply source via the first speed controller 9 and the pipe 18. As a result, the first speed controller 9 controls the descending speed of the ultrasonic horn 6 by the air cylinder 5 to be a preset descending speed, and causes the ultrasonic horn 6 to descend rapidly.

Third step. Next, when the main controller 7 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 has entered the range H2 based on the detection signal of the position sensor 14 as the ultrasonic horn unit 6 descends, The speed controller selection signal is output to the switching valve 12.

Along with this, the pipes 17, 22 from the air supply source to the inside of the air cylinder 5, the switching valve 12, the pipe 21,
A path is formed through which the air is supplied from the air supply source through the second speed controller 10 and the pipes 19 and 18.
Accordingly, the second speed controller 10 controls the descending speed of the ultrasonic horn unit 6 by the air cylinder 5 to be a slow descending speed set in advance, and gradually descends the ultrasonic horn unit 6.

Fourth step. The main controller 7 detects that the tip of the tool horn 6c of the ultrasonic horn unit 6 is the second based on the detection signal of the position sensor 14.
When it is determined that the workpiece W2 is in contact with the workpiece W2, the oscillation circuit 23 is drive-controlled to supply a high-frequency current to the ultrasonic horn unit 6. Along with this, ultrasonic vibrations are generated in the ultrasonic vibrator 6a of the ultrasonic horn unit 6, and the ultrasonic vibrations are transmitted to the tool horn 6c via the booster 6b.

The second speed controller 10 controls the drive of the air cylinder 5 to control the tool horn 6 of the ultrasonic horn section 6.
The tip of c is pressed against the second workpiece W2 with a predetermined pressure. As a result, the ultrasonic vibrations are transmitted to the second work piece W2 and the first work piece W1 via the tool horn 6c, and as a result, the second work piece W2 is opened at the opening of the first work piece W1. W1
It is ultrasonically welded to a.

Next, the main controller 7 outputs a control signal to the switching valve 12 and a control signal to the oscillation circuit 23. Along with this, the second speed controller 10 stops the driving of the air cylinder 5, and the oscillation circuit 23 stops the supply of the high frequency current to the ultrasonic transducer 6a of the ultrasonic horn unit 6. As a result, the first and second workpieces W1 and W2 are naturally cooled, and the welded portions are solidified.

Fifth step. Next, the exhaust speed controller 8 transfers the air inside the air cylinder 5 to the pipes 15 and 16 and the up / down valve 1
1. By exhausting air through the pipe 17, the rod 5b of the air cylinder 5 is raised. Along with this, the ultrasonic horn unit 6 also rises to the original position (the position shown in FIG. 1). After this, the worker is ultrasonically welded from a jig (not shown) on the upper surface of the base 1 to the first and second workpieces W1, which are integrated.
Take out W2. The above is one cycle of the ultrasonic welding work by the ultrasonic welding device.

As described above, according to the first embodiment,
Until the tool horn 6c of the ultrasonic horn 6 comes into contact with the workpiece, the first speed controller 9 sets the descending speed of the ultrasonic horn 6 by the air cylinder 5 to a relatively high descending speed. The time required before the start of the ultrasonic welding work by the horn 6c can be shortened and the ultrasonic welding work can be swiftly transitioned. As a result, the work efficiency relating to the ultrasonic welding can be improved.

Further, according to the first embodiment, the second speed controller 10 operates the ultrasonic horn by the air cylinder 5 from immediately before the tool horn 6c of the ultrasonic horn portion 6 comes into contact with the workpiece to the contact thereof. Since the descending speed of the portion 6 is set to a relatively slow descending speed, proper ultrasonic welding can be performed.

Further, according to the first embodiment, since the descending speed of the ultrasonic horn unit 6 is changed according to the position of the tip of the tool horn 6c, the descending speed of the ultrasonic horn unit 6 is lowered relatively fast. It is possible to switch from the speed to the relatively slow descending speed at an appropriate timing, and as a result, a series of operations related to ultrasonic welding can be smoothly performed.

(2) Second embodiment. FIG. 3 shows the configuration of the ultrasonic welding apparatus in the second embodiment. In the second embodiment, the first workpiece W1 ′ placed on the upper surface of the base 1 of the ultrasonic welding apparatus. Hole W1 '
The case where the second workpiece W2 'is inserted into a and ultrasonically welded is given as an example.

The ultrasonic welding apparatus in the second embodiment is
The difference from the ultrasonic welding device in the first embodiment is that the second workpiece W2 'is inserted into the hole W1'a of the first workpiece W1' and ultrasonically welded. In addition, the control functions of the main controller 27, the first speed controller 29, and the second speed controller 30 are different from each other. Other than that, the configuration is the same as that of the first embodiment described above, so that the components of FIG. The components other than the workpiece and the main controller 27, the first speed controller 29, and the second speed controller 30 are designated by the same reference numerals, and the description thereof will be omitted.

The features of the ultrasonic welding apparatus in the second embodiment will be described. In the first speed controller 29, the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1 '.
When the tool horn 6c is in the range from the original position to immediately before contacting the second workpiece W2, based on the command from the main controller 27, the descending speed of the ultrasonic horn unit 6 by the air cylinder 5 is preset. The control is performed so that the set descending speed is relatively fast.

Further, the second speed controller 30 is
The tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H2 '.
In the range (from the time when the tool horn 6c comes into contact with the second workpiece W2 until the second workpiece W2 is completely inserted into the hole W1a of the first workpiece W1), the main controller Based on the command of 27, the descending speed of the ultrasonic horn portion 6 by the air cylinder 5 is controlled to be a preset relatively slow descending speed.

When the main controller 27 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 is within the above-mentioned range H1 'based on the detection signal of the position sensor 14, it outputs the first speed controller selection signal. It is designed to output to the switching valve 12.

As a result, when the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1 ', the pipes 17 and 22, the switching valve 12 and the pipe 2 are introduced into the air cylinder 5.
Since the path through which air is supplied from the air supply source is formed through 0, the first speed controller 29, and the pipe 18, the first speed controller 29 compares the descending speeds of the ultrasonic horn units 6 as described above. It is controlled so as to achieve a rapid descending speed.

On the other hand, when the main controller 27 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 is within the above-mentioned range H2 'based on the detection signal of the position sensor 14, it outputs the second speed controller selection signal. It is designed to output to the switching valve 12.

As a result, when the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H2 ', the pipes 17 and 22, the switching valve 12 and the pipe 2 are introduced into the air cylinder 5.
Since the path through which air is supplied from the air supply source is formed via the first and second speed controllers 30 and the pipes 19 and 18, the second speed controller 30 drives and controls the air cylinder 5 and uses the tool horn 6c. While the predetermined pressure is applied to the second workpiece W2, the descending speed of the ultrasonic horn unit 6 is controlled to be a relatively slow descending speed as described above.

That is, the main controller 27 causes the first speed controller 29 to lower the descending speed of the ultrasonic horn 6 relatively quickly until just before the tool horn 6c of the ultrasonic horn 6 contacts the workpiece. The control is performed so that the tool horn 6c of the ultrasonic horn unit 6 comes into contact with the workpiece, and the second speed controller 3
When the value is 0, the descending speed control function is provided to control the descending speed of the ultrasonic horn unit 6 to be a relatively slow descending speed.

Next, the operation when ultrasonic welding is performed on a workpiece by the ultrasonic welding apparatus according to the second embodiment having the above-mentioned configuration will be described with reference to FIG.

First step. First, an operator fixes the first workpiece W1 ′ on the upper surface of the base 1 of the ultrasonic welding device via a jig (not shown), and also the hole of the first workpiece W1 ′. The second workpiece W2 ', which is inserted into the portion W1'a by ultrasonic welding, is placed on top of the first workpiece W1'.

Second step. Next, when the operator turns on the power source (not shown) of the ultrasonic welding device, the position sensor 14 near the ultrasonic horn unit 6
The detected piece 14 attached to the ultrasonic horn unit 6 is detected and a detection signal is output to the main controller 27. The main controller 27 determines that the tip of the tool horn 6c of the ultrasonic horn unit 6 is in the range H1 ′ based on the detection signal of the position sensor 14.
If it is determined that the first speed controller selection signal is output, the first speed controller selection signal is output to the switching valve 12.

Along with this, from the air supply source to the inside of the air cylinder 5, the pipes 17, 22, the switching valve 12, the pipe 20,
A path is formed through which the air is supplied from the air supply source through the first speed controller 29 and the pipe 18. As a result, the first speed controller 29 controls the descending speed of the ultrasonic horn unit 6 by the air cylinder 5 to be a fast descending speed set in advance, rapidly descends the ultrasonic horn unit 6, and the tool horn 6c. The tip of the second workpiece W2 '.

Third step. Next, when the main controller 27 drives and controls the oscillation circuit 23 and supplies a high frequency current to the ultrasonic horn unit 6,
Ultrasonic vibration is generated by the ultrasonic vibrator 6a of the ultrasonic horn unit 6, and the ultrasonic vibration is transmitted to the tool horn 6c via the booster 6b. At this time, due to the air pressure of the air cylinder 5, the tip of the tool horn 6c of the ultrasonic horn portion 6 is moved to the second position.
Since it is pressed against the upper surface of the work piece W2 ′, ultrasonic vibrations are generated by the second work piece W2 ′ via the tool horn 6c.
And to the first workpiece W1 ′.

Fourth step. When the ultrasonic vibration is transmitted from the tool horn 6c of the ultrasonic horn unit 6 to the second workpiece W2 ', the second workpiece W2'.
Starts to enter the hole W1'a of the first workpiece W1 ', and ultrasonic welding is started. Hole W1'a of the first workpiece W1 '
The tool horn 6c to which the air pressure is applied from the air cylinder 5 gradually descends with the start of the insertion of the second workpiece W2 ′ into the.

At this time, the position sensor 14 detects the detected piece 14 attached to the ultrasonic horn section 6 and outputs a detection signal to the main controller 27. Main controller 2
When it is determined based on the detection signal of the position sensor 14 that the tip of the tool horn 6c of the ultrasonic horn unit 6 has entered the range H2 ', 7 outputs a second speed controller selection signal to the switching valve 12.

Along with this, from the air supply source to the inside of the air cylinder 5, the pipes 17, 22, the switching valve 12, the pipe 21,
A path is formed through which the air is supplied from the air supply source through the second speed controller 30 and the pipes 19 and 18.
As a result, the second speed controller 30 controls the descending speed of the ultrasonic horn section 6 by the air cylinder 5 to be a slow descending speed set in advance, and the tool horn 6c.
The second work piece W2 'is pressed against the first work piece W1' at the tip of. As a result, the second workpiece W2 'is properly inserted into the hole W1'a of the first workpiece W1'.

Fifth step. When the main controller 27 determines that the rod 5b of the air cylinder 5 has reached the preset predetermined stroke based on the detection signal of the position sensor 13, the switching valve 1
2 and the control signal to the oscillation circuit 23. Along with this, the second speed controller 30 stops driving the air cylinder 5, and the oscillation circuit 23
Stops the supply of the high frequency current to the ultrasonic transducer 6a of the ultrasonic horn unit 6. As a result, the first and second workpieces W1 'and W2' are naturally cooled and the welded portions are solidified.

Sixth step. Next, the exhaust speed controller 8 transfers the air inside the air cylinder 5 to the pipes 15 and 16 and the up / down valve 1
1. By exhausting air through the pipe 17, the rod 5b of the air cylinder 5 is raised. Along with this, the ultrasonic horn unit 6 also rises to the original position (the position shown in FIG. 3). After this, the worker is ultrasonically welded from a jig (not shown) on the upper surface of the base 1 to the integrated first and second workpieces W.
Take out 1'and W2 '. The above is one cycle of the ultrasonic welding work by the ultrasonic welding device.

As described above, according to the second embodiment,
Until the tool horn 6c of the ultrasonic horn unit 6 comes into contact with the workpiece, the first speed controller 29 sets the descending speed of the ultrasonic horn unit 6 by the air cylinder 5 to a relatively high descending speed. The time required before the start of the ultrasonic welding work by the horn 6c can be shortened and the ultrasonic welding work can be swiftly transitioned. As a result, the work efficiency relating to the ultrasonic welding can be improved.

Further, according to the second embodiment, immediately before the tool horn 6c of the ultrasonic horn unit 6 comes into contact with the workpiece, the second speed controller 30 causes the ultrasonic horn unit 6 by the air cylinder 5 to move the ultrasonic horn unit 6c. To set the descending speed to a relatively slow descending speed, when inserting the other workpiece into the hole of one workpiece and performing ultrasonic welding, the descending speed of the ultrasonic horn is Since it is too high, it is possible to eliminate the problem that the other work piece is pressed into the hole of one work piece and causes poor welding of both work pieces.

Further, according to the first embodiment, since the descending speed of the ultrasonic horn section 6 is changed according to the position of the tip of the tool horn 6c, the descending speed of the ultrasonic horn section 6 is lowered relatively fast. It is possible to switch from the speed to the relatively slow descending speed at an appropriate timing, and as a result, a series of operations related to ultrasonic welding can be smoothly performed.

[0067]

As described above, according to the ultrasonic welding method of the present invention as set forth in claim 1, in the first step, the ultrasonic horn portion of the ultrasonic horn is used until just before the tool horn contacts the workpiece. The transfer speed is controlled to be a relatively high transfer speed, and in the second step, the ultrasonic horn part of the ultrasonic horn unit is applied while applying a predetermined pressure from immediately before the tool horn abuts the workpiece to the time when the tool horn abuts the workpiece. Since the transfer speed is controlled to be a relatively low transfer speed, it is possible to shorten the time required before the start of the ultrasonic welding work with the tool horn and to rapidly shift to the ultrasonic welding work. It is possible to improve the working efficiency of ultrasonic welding.

According to the ultrasonic welding method of the present invention as set forth in claim 2, the transfer speed of the ultrasonic horn is relatively high until just before the tool horn contacts the workpiece in the first step. In the second step, after the tool horn abuts the workpiece, the ultrasonic horn is moved at a relatively low speed while applying a predetermined pressure to the workpiece. In order to achieve the same effect as that of the invention according to claim 1 and to make the ultrasonic horn part have a relatively slow transfer speed after the tool horn contacts the workpiece as described above. , For example, when performing ultrasonic welding by inserting the other workpiece into the hole of one workpiece, transfer the ultrasonic horn portion at a higher constant speed in order to improve the work efficiency of ultrasonic welding as in the past. As in the case of Workpiece can be eliminated such a disadvantage causes poor welding of a press-fit state both workpiece. Therefore, there is an effect that it is possible to achieve both improvement in work efficiency related to ultrasonic welding and proper ultrasonic welding.

According to the ultrasonic welding apparatus of the third aspect of the present invention, the control unit detects the tool based on the detection information of the position sensor that detects that the tip of the tool horn has reached a predetermined position near the machining point. The transfer speed of the ultrasonic horn is controlled to a relatively high transfer speed immediately before the horn comes into contact with the work piece, and a predetermined pressure is applied to the work piece immediately before the tool horn comes into contact with the work piece. In addition, since the transfer speed of the ultrasonic horn unit is controlled to a relatively low transfer speed, the same effect as that of the invention according to claim 1 is obtained, and as described above, the ultrasonic speed is changed according to the position of the tip of the tool horn. Since the transfer speed of the ultrasonic horn is variable, it is possible to switch the transfer speed of the ultrasonic horn from a relatively high transfer speed to a relatively low transfer speed at an appropriate timing. It is possible to perform a series of operations smoothly, an effect that.

According to the ultrasonic welding apparatus of the present invention as defined in claim 4, the control section detects the fact that the tip of the tool horn has reached a predetermined position close to the machining point, based on the information from the position sensor, and the tool horn. Until the tool contacts the work piece, the transfer speed of the ultrasonic horn is controlled to a relatively high transfer speed, and after the tool horn contacts the work piece, the ultrasonic wave is applied while applying a predetermined pressure to the work piece. Since the transfer speed of the horn part is controlled to be a relatively low transfer speed, the same effects as those of the inventions according to claims 1 and 3 are obtained, and further, as described above, the tool horn comes into contact with the workpiece. After that, because the ultrasonic horn part has a relatively slow transfer speed, for example, when performing ultrasonic welding by inserting the other workpiece into the hole of one workpiece,
As in the conventional case where the ultrasonic horn is moved at a higher constant speed in order to improve the work efficiency of ultrasonic welding, the other workpiece is pressed into the hole of one workpiece. It is possible to solve the problem of causing defective welding of the workpiece. Therefore, there is an effect that it is possible to achieve both improvement in work efficiency related to ultrasonic welding and proper ultrasonic welding.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an ultrasonic welding device in a first embodiment to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an operation when ultrasonically welding a workpiece by the ultrasonic welding device in the first embodiment.

FIG. 3 is an explanatory diagram showing an overall configuration of an ultrasonic welding device in a second embodiment.

FIG. 4 is an explanatory diagram showing an operation when ultrasonically welding a workpiece by an ultrasonic welding device in a second embodiment.

[Explanation of symbols]

 5 Air cylinder as horn transfer pressurizing unit 6 Ultrasonic horn unit 6a Ultrasonic transducer 6b Booster 6c Tool horn 7,27 Main controller as control unit 9,29 First speed controller 10,30 Second speed controller 13 Position Sensor W1, W1 ′ First work piece as work piece W2, W2 ′ Second work piece as work piece

Claims (4)

[Claims] 1. An ultrasonic horn unit having a tool horn to which ultrasonic vibrations are transmitted is transferred toward a work piece, and the tool horn is pressed against the work piece for ultrasonic welding. In the ultrasonic welding method, the first step of controlling the transfer speed of the ultrasonic horn part to be a relatively high transfer speed until just before the tool horn contacts the workpiece. A second control is performed from immediately before the tool horn comes into contact with the workpiece to the time when the tool horn comes into contact with the workpiece so that the transfer speed of the ultrasonic horn unit becomes a relatively slow transfer speed while applying a predetermined pressure to the workpiece. An ultrasonic welding method comprising the steps of: 2. An ultrasonic horn unit having a tool horn to which ultrasonic vibrations are transmitted is moved toward a work piece, and the tool horn is pressed against the work piece for ultrasonic welding. In the ultrasonic welding method, the first step of controlling the transfer speed of the ultrasonic horn part to be a relatively high transfer speed until just before the tool horn contacts the workpiece. After the tool horn comes into contact with the work piece, a second step of controlling the transfer speed of the ultrasonic horn part to be a relatively slow transfer speed while applying a predetermined pressure to the work piece. An ultrasonic welding method characterized by being provided. 3. An ultrasonic horn part having an ultrasonic vibrator and a tool horn mounted on the ultrasonic vibrator via a booster, and an ultrasonic horn part attached to the ultrasonic horn part to be processed. A horn transfer pressurizing section for transferring the tool horn to the workpiece and pressurizing the tool horn to the workpiece, and a control section for controlling the transfer speed of the ultrasonic horn section by the horn transfer pressurizing section. In an ultrasonic welding apparatus provided with, in the vicinity of the ultrasonic horn portion, a position sensor is provided for detecting that the tip of the tool horn has reached a predetermined position close to a processing point, and the control unit is the position sensor. It operates based on the detection information, and the transfer speed of the ultrasonic horn unit by the horn transfer pressurizing unit is controlled to be a relatively high transfer speed immediately before the tool horn comes into contact with the workpiece. The operating speed of the ultrasonic horn section by the horn transfer pressurizing section operates while operating on the basis of the detection information of the tool and immediately before the tool horn comes into contact with the workpiece until it comes into contact with the workpiece. An ultrasonic welding device having a transfer speed control function for controlling a transfer speed to be relatively slow. 4. An ultrasonic horn part having an ultrasonic vibrator and a tool horn mounted on the ultrasonic vibrator via a booster, and an ultrasonic horn part attached to the ultrasonic horn part to be processed. A horn transfer pressurizing section for transferring the tool horn to the workpiece and pressurizing the tool horn to the workpiece, and a control section for controlling the transfer speed of the ultrasonic horn section by the horn transfer pressurizing section. In an ultrasonic welding apparatus provided with, in the vicinity of the ultrasonic horn portion, a position sensor is provided for detecting that the tip of the tool horn has reached a predetermined position close to a processing point, and the control unit is the position sensor. It operates based on the detection information, and the transfer speed of the ultrasonic horn unit by the horn transfer pressurizing unit is controlled to be a relatively high transfer speed immediately before the tool horn comes into contact with the workpiece. After the tool horn comes into contact with the work piece by operating based on the detection information of the tool, the transfer speed of the ultrasonic horn part by the horn transfer pressurizing part is relatively slow while applying a predetermined pressure to the work piece. An ultrasonic welding device having a transfer speed control function for controlling the transfer speed.