DE102019114557A1 - Ultrasonic bonding apparatus and ultrasonic bonding method - Google Patents

Abstract

The invention relates to a device (10) for ultrasonic joining of joining partners (1) using ultrasonic tools and a method for ultrasonic joining. The device (10) comprises at least one sonotrode (3) that can be excited to produce ultrasonic vibrations, a temperature control device (4) for temperature control of at least one ultrasonic tool (2) and / or a joining partner (1). The device (10) also comprises a movement device (5) which is designed to move the temperature control device (4), the temperature control device (4) with at least part of the outside (6) of the ultrasonic tool (2) and / or of the joining partner (1) at least intermittently contact, and preferably break contact during ultrasonic bonding.

Description

The invention relates to a device for ultrasonic joining of joining partners with ultrasonic tools, comprising at least one sonotrode that can be excited to produce ultrasonic vibrations and a temperature control device, as well as a method for ultrasonic joining.

A variety of devices for ultrasonic joining are known from the prior art in which temperature control takes place. The processes should be kept stable, especially for welding tasks with critical temperature control. If the welding tools are not at the right temperature, there is a risk of buildup on the tools, especially when welding aluminum.

In principle, quality fluctuations can occur if the temperature is not kept stable.

The DE 102 50 741 B4 discloses a heated oscillating tool in which a heat generator is arranged concentrically around the sonotrode and encloses the sonotrode like a jacket.

According to DE 40 32 192 A1 a heating element can be materially connected to the outside of a tool.

DE 101 51 992 B4 shows a cooling element which is arranged between a vibration generator and a sonotrode.

DE 10 2013 214 106 A1 discloses sonotrodes with an integrated cooling device, wherein a coolant flows through the sonotrode body or a heat dissipation device is formed in the sonotrode body. According to DE 10 2011 109 518 A1 heating cartridges can be arranged in a sonotrode.

Out EP 1 868 182 A1 an ultrasonic transducer is known in which the electromechanical transducer is surrounded by a cooling liquid.

The disadvantage of the temperature control devices mentioned is that the temperature control devices are moved along with the vibration or at least have to be taken into account during the ultrasonic connection.

In the WO 2018/145769 A1 is mentioned, among other things, the cooling of a sonotrode with a cooling medium that is blown onto the sonotrode from outside.

EP 3 269 492 A1 shows a sonotrode that is pulled to a support block with a temperature-controlled screw.

It is therefore an object of the present invention to overcome the disadvantages of the prior art. In particular, devices for ultrasonic connection and methods for ultrasonic connection are to be provided with which reliable cooling is made possible in a simple manner.

The object is achieved with devices for ultrasonic connection and methods according to the independent claims.

The device for ultrasonically connecting parts to be joined with ultrasonic tools is in particular a device for ultrasonic welding and / or ultrasonic soldering.

The device for ultrasonic joining comprises at least one sonotrode which can be excited to produce ultrasonic vibrations, which can be brought into contact with at least one of the joining partners and by means of which the joining partner can be subjected to ultrasound in such a way that the joining partners are connected.

The device for ultrasonic connection also includes a temperature control device for temperature control of at least one ultrasonic tool and / or a joining partner.

The device comprises a movement device. The movement device is designed to move the temperature control device in order to at least temporarily bring the temperature control device into contact with at least part of the outside of the ultrasonic tool and / or the joining partner, and preferably to break the contact during the ultrasonic connection.

The temperature control takes place during the contact of the temperature control device with the ultrasonic tool and / or the joining partner. The heat is exchanged via convection via the contact surface. The temperature control can be very effective. With a sufficiently large temperature gradient and / or a sufficiently large contact surface, a target temperature can be reached quickly, for example.

The temperature control device can be brought specifically to external surfaces that are not accessible during the ultrasonic connection.

Since the temperature control device is not in contact with the ultrasonic tool and / or the joining partner during the ultrasonic connection must come, no consideration needs to be paid to the temperature control device in terms of vibration.

The temperature control device can keep the ultrasonic tool ready for operation by keeping the ultrasonic tool at a suitable temperature. As soon as a bonding cycle is to begin, the temperature control device can be decoupled from the ultrasonic tool and the bonding cycle can be started immediately.

Joining partners can also be tempered before, during and / or after positioning, so that they have the right temperature for the joining process. Additionally or alternatively, the joining partners can also be tempered after joining, for example in order to dissipate process heat.

Any device for ultrasonic connection can therefore be retrofitted with a combination of temperature control device and corresponding movement device.

The movement device can enable a rotation, a pivoting movement or a displacement of the temperature control device. The movement device can have a mounting for holding elements of the temperature control device. The movement device can have a drive device for performing the movement.

The movement device can comprise a motor, a pneumatic parallel gripper, an angular gripper, a pneumatic clamp or a pneumatic cylinder.

The temperature control device preferably has at least one contact surface that is complementary to a part of the outside of the ultrasonic tool and / or of the joining partner, so that an effective heat transfer is made possible.

The at least one ultrasonic tool that can be contacted by the temperature control device can be the sonotrode, a booster, a converter, an anvil, a hold-down device and / or a sideshift.

The temperature control device can be connected to a tool for contact with the joining partner, which preferably only takes place before and / or after the connection, or it can be integrated into a tool that is removed from the joining partner during the connection, for example a stop or a hold-down device, or with a tool that is arranged outside the compression chamber, for example a cable clamp.

In an advantageous embodiment, the temperature control device has at least one temperature control channel for passing through a temperature control fluid. The temperature control fluid can be, for example, water, oil or compressed air.

Alternatively or additionally, the temperature control device can comprise at least one electrical temperature control element.

The temperature control device is brought to a desired temperature via the temperature control fluid and / or via the electrical temperature control element and passes this on to the ultrasonic tool and / or the joining partner upon contact.

The temperature control device can absorb and / or release heat. The temperature control device can therefore heat or cool the ultrasonic tool and / or the joining partner.

The temperature control device preferably has at least two sub-elements. The sub-elements can each be equipped with at least one temperature control channel and / or with at least one electrical temperature control element.

These sub-elements can be arranged opposite one another with respect to the ultrasonic tool to be contacted and / or the joining partner to be contacted.

The temperature control device can approach the ultrasonic tool and / or the joining partner from several sides and thus contact a large part of the outer surface.

The temperature control device can comprise, for example, two temperature control jaws that are brought up to the sonotrode on both sides.

In an advantageous embodiment of the device, the temperature control device can be moved transversely to a direction in which the ultrasonic tool to be contacted and / or the joining partner to be contacted can be moved.

If, for example, the sonotrode can be moved vertically in the direction of the joining partner in order to be brought into the working position or out of the working position, the temperature control device can perform a movement in the transverse direction, for example in the horizontal direction.

In the working position, the sonotrode can apply ultrasound to the joint partners.

If necessary, all sub-elements can perform transverse movements, which are preferably symmetrical with respect to the one to be contacted Ultrasonic tool and / or the joining partner to be contacted run.

The device advantageously comprises a control unit which is designed to establish contact between the temperature control device and an ultrasonic tool to be contacted and / or the joining partner before and / or after the welding process. The control unit is preferably coupled to a control device for controlling the ultrasonic connection process or a part of this control device. The movement of the temperature control device can then take place as a function of the connection process. As soon as the connection cycle is to be started, the temperature control device is decoupled from the ultrasonic tool and / or the joining partner and the contact between the temperature control device and the outside is canceled. When the connection cycle is complete, contact can be re-established.

Alternatively or additionally, the control unit is designed to set the temperature control according to a preselected temperature or temperature curve.

The device advantageously comprises a temperature sensor which is designed to detect the temperature on the temperature control device and / or on the at least one ultrasonic tool to be contacted and / or on the at least one joining partner to be contacted.

If the temperature sensor is provided on the temperature control device, the temperature of the temperature control device is primarily recorded. The measurement can also indirectly provide information about the temperature of the ultrasonic tool and / or the joining partners, in particular when there is contact. The temperature sensor can therefore be used to check whether the ultrasonic tool and / or the joining partner are ready for operation.

The temperature sensor can be coupled to the control unit and / or to the control device. The start of a joining process can be prevented if the ultrasonic tool and / or the joining partner are not yet at the desired temperature.

The device can comprise a control unit which is designed to control the temperature control as a function of the measured temperature in accordance with a preselected temperature or temperature curve. If the ultrasonic tool and / or the joining partner is not yet at the desired temperature, it is possible to wait until the desired temperature has been set and / or the temperature gradient can be increased.

The object is also achieved by a method for ultrasonic joining, in particular ultrasonic welding and / or ultrasonic soldering, of joining partners.

A device as described above is preferably used.

The ultrasonic connection takes place using at least one sonotrode that can be excited to produce ultrasonic vibrations, which is brought into contact with at least one of the joining partners and by means of which the joining partner is subjected to ultrasound in such a way that the joining partners are connected.

A temperature control device for temperature control is brought up to the outside of at least one ultrasonic tool and / or at least one joining partner. The temperature control device is at least temporarily brought into contact with at least part of the outside of the ultrasonic tool and / or of the joining partner.

Preferably, the contact is broken during the ultrasonic bonding.

To break the contact, the temperature control device is moved away from the ultrasonic tool and / or the joining partner again.

The temperature control device can contact the at least one ultrasonic tool and / or the joining partner before and / or after the connection process.

The at least one ultrasonic tool that is contacted by the temperature control device can be the sonotrode, a booster, a converter, an anvil, a hold-down device and / or a sideshift.

While the temperature control device is in contact with the ultrasonic tool, a temperature control fluid, for example water, oil or compressed air, can be passed through at least one temperature control channel of the temperature control device.

Alternatively or additionally, at least one electrical temperature control element can be activated.

The temperature control device preferably has at least two sub-elements. These can be brought up to the ultrasonic tool and / or the joining partner from two opposite sides with respect to the ultrasonic tool to be contacted and / or the joining partner to be contacted.

The temperature control device can be moved transversely to a direction in which the ultrasonic tool to be contacted and / or the joining partner to be contacted can be moved.

The temperature control can be set according to a preselected temperature or temperature curve, preferably via a corresponding control unit.

The temperature of the temperature control device and / or of the at least one ultrasonic tool to be contacted and / or of the joining partner to be contacted is advantageously measured.

The temperature of the temperature control device and / or of the at least one ultrasonic tool to be contacted and / or of the at least one joining partner to be contacted can be regulated to a preselected temperature or temperature curve as a function of the measured temperature value.

For this purpose, the measured temperature value is compared with a setpoint value, preferably stored in a control unit. If the value is not reached, action can be taken.

Contact can be established or interrupted between the temperature control device and the ultrasonic tool and / or the joining partner, contact can be maintained, and the temperature gradient between the temperature control device and the ultrasonic tool and / or the joining partner can be changed.

• 1: eine schematische Darstellung eines ersten Beispiels für eine Vorrichtung zum Ultraschallverbinden in einer ersten Position;
• 2: eine schematische Darstellung des ersten Beispiels für eine Vorrichtung zum Ultraschallverbinden in einer zweiten Position;
• 3: eine schematische Darstellung eines Beispiels für eine Temperiervorrichtung;
• 4: eine schematische Darstellung eines weiteren Beispiels für eine Temperiervorrichtung.

The invention and its advantages are explained in more detail below on the basis of exemplary embodiments. Show it

• 1 : a schematic representation of a first example of a device for ultrasonic joining in a first position;
• 2 : a schematic representation of the first example of a device for ultrasonic joining in a second position;
• 3 : a schematic representation of an example of a temperature control device;
• 4th : a schematic representation of a further example of a temperature control device.

1 shows a schematic representation of a first example of a device 10 for the ultrasonic connection of joining partners 1 with ultrasonic tools 2 . The device 10 includes a sonotrode that can be excited to produce ultrasonic vibrations 3 , which with one of the joining partners 1 can be brought into contact and by means of which the joining partner 1 can be acted upon with ultrasound in such a way that the joining partners 1 get connected.

The device 10 also includes a temperature control device 4th for tempering the sonotrode 3 .

The device further comprises a movement device 5 , which is designed for the temperature control device 4th to move and the temperature control device 4th with at least part of the outside 6th the sonotrode 3 at least temporarily to bring them into contact.

2 shows a schematic representation of the first example of the device 10 for ultrasonic connection in a second position, namely during the ultrasonic connection when the sonotrode 3 the joining partners 1 applied with ultrasound. In this situation there is contact between the temperature control device 4th and sonotrode 3 canceled.

The temperature control device 4th has two sub-elements 7th on that regarding the sonotrode 3 are arranged opposite one another. By means of the movement device 5 are the sub-elements 7th in one direction 8th movable that transverse to the direction 9 runs along which the sonotrode 3 is brought into the working position.

The movement device 5 can comprise a sliding, folding and / or pivoting mechanism.

The temperature control device 4th includes a control unit 12 that is designed to prevent the contact between temperature control device 4th and the sonotrode 3 before and after the welding process.

The control unit 12 is on the one hand with the movement device 5 coupled, on the other hand with a control device 13 for setting the movement of the sonotrode 3 .

With the control unit 12 the temperature control can also be set according to a preselected temperature or temperature curve.

If the temperature is also recorded (see 3 ), so can the control unit 12 as part of a control unit 15th set the temperature control depending on the measured temperature according to a preselected temperature or temperature curve.

3 shows a schematic representation of an example of a temperature control device 4th .

The temperature control device 4th includes a temperature control channel 11 for carrying out a temperature control fluid, for example water, oil or compressed air.

On the temperature control device 4th is a temperature sensor 14th appropriate. About the change in the measured temperature during contact with an ultrasonic tool 2 , 3 (please refer 1 ) or a joining partner (see 4th ) the temperature of the same can also be determined indirectly.

4th shows a schematic representation of a further example of a temperature control device 4th .

The temperature control device 4th in this example comprises two sub-elements 7th , which are designed as water-cooled cable clamps.

The sub-elements 7th press a joining partner 1 , here a copper wire, into the recess 16 an ultrasonic tool 2 , here a counterpart, and contact the outside of the joining partner 1 .

During the positioning, the joining partner becomes 1 tempered. If the sonotrode (not shown) 3 is lowered, the sub-elements 7th from the joining partner 1 away.

List of reference symbols

1

Joining partner

(2)

Ultrasonic tools

3

Sonotrode

4th

Temperature control device

5

a movement device

6th

Outside

7th

Sub-elements

(8th)

direction

(9)

direction

(10)

contraption

(11)

Temperature control channel

12

Control unit

13

Control device

(14)

Temperature sensor

15th

Control unit

16

Recess

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10250741 B4 [0004]
• DE 4032192 A1 [0005]
• DE 10151992 B4 [0006]
• DE 102013214106 A1 [0007]
• DE 102011109518 A1 [0007]
• EP 1868182 A1 [0008]
• WO 2018/145769 A1 [0010]
• EP 3269492 A1 [0011]

Claims (16)

Device (10) for ultrasonic joining, in particular ultrasonic welding and / or ultrasonic soldering, of joining partners (1) with ultrasonic tools (2, 3), comprising at least one sonotrode (3) which can be excited to produce ultrasonic vibrations and which can be brought into contact with at least one of the joining partners (1) and by means of which the joining partner (1) can be acted upon with ultrasound in such a way that the joining partners (1) are connected, and a temperature control device (4) for temperature control of at least one ultrasonic tool (2) and / or a joining partner (1), characterized in , that the device comprises a movement device (5) which is designed to move the temperature control device (4), the temperature control device (4) with at least part of the outside (6) of the ultrasonic tool (2) and / or the joining partner (1) at least temporarily to bring into contact, and preferably to break the contact during the ultrasonic bonding. Device according to Claim 1 , the at least one ultrasonic tool (2) which can be contacted by the temperature control device (4) is the sonotrode (3), a booster, a converter, an anvil, a hold-down device and / or a sideshift. Device according to Claim 1 or 2 , wherein the temperature control device (4) has at least one temperature control channel (11) for passing through a temperature control fluid, for example water, oil or compressed air, and / or comprises at least one electrical temperature control element. Device according to one of the preceding claims, wherein the temperature control device (4) has at least two sub-elements (7) which are arranged opposite one another with respect to the ultrasonic tool (2, 3) to be contacted and / or the joining partner (1) to be contacted. Device according to one of the preceding claims, wherein the temperature control device (4) can be moved transversely to a direction (9) in which the ultrasonic tool (2, 3) to be contacted and / or the joining partner (1) to be contacted can be moved. Device according to one of the preceding claims, wherein the device comprises a control unit (13) which is designed to establish contact between the temperature control device (4) and an ultrasonic tool (2, 3) to be contacted and / or the joining partner (1) before and / or after the welding process and / or set the temperature control according to a preselected temperature or temperature curve. Device according to one of the preceding claims, wherein the device (10) comprises a temperature sensor (14) which is designed to measure the temperature on the temperature control device (4) and / or on the at least one ultrasonic tool (2, 3) to be contacted and / or on the at least one joining partner (1) to be contacted. Device according to Claim 7 wherein the device (10) comprises a control unit (15) which is designed to regulate the temperature control as a function of the measured temperature in accordance with a preselected temperature or temperature curve. Method for ultrasonic joining, in particular ultrasonic welding and / or ultrasonic soldering, of joining partners (1), preferably with a device according to one of the preceding claims, wherein at least one sonotrode (3) that can be excited to ultrasonic vibrations is brought into contact with at least one of the joining partners (1) and by means of which the joining partner (1) is subjected to ultrasound in such a way that the joining partners are connected, characterized in that a temperature control device (4) for temperature control is brought up to the outside of at least one ultrasonic tool and / or at least one joining partner (1), with at least a part of the outside of the ultrasonic tool (2, 3) and / or of the joining partner (1) is at least temporarily brought into contact and preferably the contact is canceled during the ultrasonic connection. Procedure according to Claim 9 The at least one ultrasonic tool (2, 3) which is contacted by the temperature control device (4) is the sonotrode (3), a booster, a converter, an anvil, a hold-down device and / or a sideshift. Procedure according to Claim 9 or 10 , whereby during the contact of the temperature control device (4) with the ultrasonic tool, a temperature control fluid, for example water, oil or compressed air, is passed through at least one temperature control channel (11) of the temperature control device (4) and / or electrical temperature control elements are activated. Method according to one of the Claims 9 to 11 , wherein the temperature control device (4) has at least two sub-elements (7) and wherein the at least two sub-elements (7) from two opposite sides with respect to the ultrasonic tool (2, 3) to be contacted and / or the joining partner (1) to be contacted, to the ultrasonic tool (2, 3) and / or the joining partner (1). Method according to one of the Claims 9 to 12 wherein the temperature control device (4) is moved transversely to a direction (9) in which the ultrasonic tool (2, 3) to be contacted and / or the joining partner (1) to be contacted can be moved. Method according to one of the Claims 9 to 13 , whereby the temperature control is set according to a preselected temperature or temperature curve. Method according to one of the Claims 9 to 14th , wherein the temperature of the temperature control device (4) and / or of the at least one ultrasonic tool (2, 3) to be contacted and / or of the at least one joining partner (1) to be contacted is measured. Procedure according to Claim 15 , the temperature of the temperature control device (4) and / or of the at least one ultrasonic tool (2, 3) to be contacted and / or of the at least one joining partner (1) to be contacted is regulated to a preselected temperature or temperature curve as a function of the measured temperature value.

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