Ultrasonic welding device having a sonotrode carrier and a sonotrode fastened thereto

Abstract

The ultrasonic welding device (1) includes a sonotrode (3) and a sonotrode carrier (2) configured to generate ultrasonic vibrations of the sonotrode (3). Both the sonotrode (3) and the sonotrode carrier (2) have contact surfaces (5), at least one of the contact surfaces (5) being at least partially roughened. The sonotrode (3) is replaceably fastened to the sonotrode carrier (2) such that the contact surfaces (5) are pressed against one another.

Description

[Technical field]

[0001] The present invention relates to an ultrasonic welding device. The present invention further relates to a method for manufacturing a sonotrode for such an ultrasonic welding device and to a method for manufacturing a sonotrode carrier for such an ultrasonic welding device. [Background technology]

[0002] Ultrasonic welding devices generally comprise a sonotrode carrier to which sonotrodes can be interchangeably fastened. The ultrasonic vibrations of the sonotrode can be brought about by the sonotrode carrier, the energy of which can then be transmitted via the sonotrode to the workpieces to be welded. Depending on the application, the sonotrode carrier can be combined with different kinds of sonotrodes, such as (to name just a few) sonotrodes for spot or roll seam welding, or sonotrodes in the form of bent resonators that can also be used in difficult-to-access places.

[0003] The sonotrode can be screwed onto the sonotrode carrier, for example, via one or more screws. Deviations in the tightening torque of the screw(s), for example as a result of the use of an incorrect tool or as a result of dirty or defective joining surfaces, can significantly affect the vibration characteristics of the sonotrode and thus the welding characteristics of the ultrasonic welding device. Insufficient clamping force can, for example, cause the sonotrode to rotate during the welding operation and / or to deform excessively in the area of ​​the joining surfaces, which can have a negative effect on the welding result. In the worst case, the sonotrode and / or the screw can break. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, there may be a need for an ultrasonic welding device that allows a good fastening of the sonotrode to the sonotrode carrier.

[0005] Furthermore, a correspondingly improved method for manufacturing sonotrodes may be needed.

[0006] In particular, a correspondingly improved method for manufacturing a sonotrode carrier may be required.

[0007] These requirements may be met by the subject matter of the independent claims. Advantageous embodiments are set forth in the dependent claims, the following description and the accompanying drawings. [Means for solving the problem]

[0008] A first aspect of the invention relates to an ultrasonic welding device. The ultrasonic welding device comprises at least one sonotrode and a sonotrode carrier configured to induce ultrasonic vibrations of the sonotrode. Both the sonotrode and the sonotrode carrier have contact surfaces, hereinafter also called coupling surfaces. At least one of the contact surfaces is at least partially roughened. The sonotrode is replaceably fastened to the sonotrode carrier such that the contact surfaces are pressed against each other.

[0009] A second aspect of the invention relates to a method for manufacturing a sonotrode for an ultrasonic welding device, as described above and below, comprising at least one step of providing a sonotrode in an as-treated state and a step of treating the sonotrode to at least partially roughen a contact surface of the sonotrode.

[0010] A third aspect of the invention relates to a method for manufacturing a sonotrode carrier for an ultrasonic welding device as described above and below, the method comprising at least one step of providing a sonotrode carrier as is to be treated and a step of treating the sonotrode carrier to at least partially roughen a contact surface of the sonotrode carrier.

[0011] It should be noted that features of the ultrasonic welding apparatus may also be understood as features of the methods described above and below, and vice versa.

[0012] Without limiting the scope of the invention in any way, embodiments of the invention may be considered to be based on the concepts and findings described below.

[0013] As already mentioned, the connection between the sonotrode and the sonotrode carrier is decisive for the quality of the welding result. How good this connection is can depend on various influencing factors, for example whether the specified tightening torque of the screws is observed, how clean the contact surfaces are or the production-specific surface properties of the contact surfaces.

[0014] The approach presented here therefore makes it possible to make the connection between the sonotrode and the sonotrode carrier significantly less sensitive to contamination, for example by oil or grease, to maintenance and installation errors of the sonotrode, as well as to production variations of the associated components, and in fact no undesirable notches are produced on the sonotrode and / or the sonotrode carrier, which, even if they are relatively small, could lead to damage, taking into account the high levels of strain to which the sonotrode or the sonotrode carrier are subjected during the welding operation.

[0015] This is achieved in principle in that the friction between the sonotrode and the sonotrode carrier is increased in a suitable manner by targeted roughening of one or both contact surfaces or at least one section thereof. In other words, by correspondingly roughening the sonotrode and / or the sonotrode carrier using suitable processing methods, one or more roughened sections can be created in one or both contact surfaces which can hook on one another at a microscopic level with the corresponding counterpart, e.g. one or more sections that are not roughened and / or one or more sections of the corresponding roughened counterpart. Such micro-toothing ensures a reliable connection between the sonotrode and the sonotrode carrier during the welding operation and in fact does not require an increase in the clamping force with which the sonotrode and the sonotrode carrier are pressed against one another.

[0016] This beneficial effect could be demonstrated in tests measuring the rotational force required to rotate a sonotrode in a configuration known as a flexural resonator (see further below) relative to a sonotrode carrier.

[0017] The following parameters were used for the tests: distance of the application point of the rotational force from the center of the sonotrode: 78 mm, feed rate: 2 mm / min, tightening torque of the screw for fastening the sonotrode to the sonotrode carrier: 20 Nm. The force was introduced perpendicular to the longitudinal axis of the sonotrode.

[0018] In this case, it was possible to increase the torque from about 550 N for sonotrodes with unprocessed, i.e. not specially roughened, contact surfaces to about 800 N for sonotrodes with contact surfaces roughened by laser processing and even up to 1150 N for sonotrodes with contact surfaces roughened by blasting with glass pearls. It was therefore possible to more than double the stability of the fastening while having the same tightening torque. All the tested sonotrodes were unremarkable in terms of vibration properties.

[0019] The increase in the rotational force can be explained by the fact that as a result of the defined structures in the contact surface on the sonotrode and / or sonotrode carrier, a kind of positive locking on a microscopic scale, i.e. microtoothedness, is generated. The structures can be embodied in such a way that they penetrate the corresponding counterparts minimally, i.e. the sonotrode and sonotrode carrier do not contact the contact surface in a point-like or linear manner, but rather superficially. The structures used for the surface pressed together with the mating microtoothedness and / or structure may be slightly elastically and / or plastically deformed. The protruding edges or apexes of the structures generated by roughening can slightly penetrate the material close to the mating surface and thus result in microtoothedness. The deformations may be only a few millimeters or even smaller, in particular significantly smaller than the structures generated by roughening.

[0020] Some of the terms used above and below are explained in more detail below.

[0021] The term contact surface can be understood on the one hand as a macroscopically flat surface section of the sonotrode where the sonotrode comes into contact with the contact surface of the sonotrode carrier. On the other hand, it can be understood as a macroscopically flat surface section of the sonotrode carrier where the sonotrode carrier comes into contact with the contact surface of the sonotrode. The two contact surfaces can be covered by each other by fastening the sonotrode to the sonotrode carrier and pressed against each other with a defined clamping force.

[0022] The sonotrode and the sonotrode carrier can only be in contact at their contact surfaces.

[0023] The contact surface may be roughened partially, i.e. in one or more coherent or distinct sections, or the entire contact surface may be roughened, i.e. the roughened sections extend across the entire contact surface.

[0024] The term roughened section may in this context be understood as a flat part of the contact surface that has been specially treated, e.g. as a result of a special treatment, which has a significantly greater roughness than a part of the contact surface that has not been so treated or another surface of the sonotrode and / or sonotrode carrier. For this purpose, the contact surface may have been treated, for example, using mechanical, optical, electrical (e.g. erosion), electrochemical or chemical methods for surface treatment or using a combination of at least two of these methods. In other words, the treatment may result in the formation of special friction-increasing structures in the region of the contact surface, the friction-increasing properties of the structures being the same in all directions, i.e. non-directional or isotropic, or different in different directions, i.e. directional or anisotropic.

[0025] The roughness of such roughened sections of the contact surface may be quantitatively and / or qualitatively different from the roughness of sections of the contact surface that are not so roughened. The non-roughened sections may be substantially smooth, and the micro-irregularities of the surface of this section may arise from the manufacturing or processing method. For example, the non-roughened sections may have a residual roughness resulting from the machining of the associated component and / or the grinding, sanding or polishing of the associated component. Such residual roughness is generally anisotropic, i.e. the associated sections generally have a surface structure with a preferred direction that may correspond, for example, to the processing direction during machining, grinding, sanding or polishing. The roughness of the intentionally roughened sections of the contact surface may be significantly greater, for example by a factor of 2, 5 or even 10, compared to the non-roughened sections. Furthermore, techniques that generate an isotropic rough surface structure, i.e. without a preferred direction, such as, for example, laser irradiation, particle blasting, especially glass ball blasting or sand blasting, may be used for the targeted roughening of the contact surface.

[0026] The sonotrode carrier may, for example, comprise a converter and / or a booster. The sonotrode carrier may further comprise a generator. The sonotrode may, for example, be fastened to the free end of the sonotrode carrier (in the longitudinal direction) to the booster or converter, in such a way that the vibration axis, along which the sonotrode carrier can move back and forth, in particular at frequencies in the ultrasonic range, stands perpendicular to the contact surface.

[0027] In certain embodiments, the sonotrode carrier may further comprise an intermediate piece which is fastened to the booster or converter on the one hand and to which the sonotrode can be fastened on the other hand.

[0028] The term converter can be understood as an electromechanical component formed to convert the high frequency voltage supplied by the generator into mechanical ultrasonic vibrations having a corresponding frequency within the ultrasonic range, for example 20 kHz to 100 kHz, preferably 20 kHz to 35 kHz.

[0029] The booster, also called a transmission or amplitude conversion piece, can be formed to modify the ultrasonic vibrations provided by the converter with respect to their amplitude, i.e. to reduce and / or increase the amplitude, and transmit the so modified ultrasonic vibrations to the sonotrode. The booster may further be formed to attach the sonotrode carrier to the ultrasonic welding device.

[0030] The term sonotrode can be understood as a tool that can perform corresponding high-frequency resonant vibrations as a result of the introduction of ultrasonic vibrations and that is formed to transmit these vibrations to the workpiece or workpieces to be welded. For example, the sonotrode, in particular when embodied as a two-arm flexural resonator (see further below), may be formed to be symmetrical with respect to its longitudinal and / or transverse axis. Thus, non-uniform distortions on the sonotrode can be avoided.

[0031] According to one embodiment, the sonotrode can be replaceably fastened to the sonotrode carrier via at least one screw. In this case, the screw can press the contact surfaces against each other. This allows a controlled pressing of the contact surfaces. Thus, the replacement of the sonotrode can be further simplified. The sonotrode may also be replaceably fastened to the sonotrode carrier via two or more screws.

[0032] According to one embodiment, the thread may be introduced into the sonotrode opening of the sonotrode, which may be at least partially surrounded by the contact surface of the sonotrode. Additionally or alternatively, the thread may be introduced into the sonotrode carrier opening of the sonotrode carrier, which may be at least partially surrounded by the contact surface of the sonotrode carrier. In other words, the thread may run laterally, in particular vertically, through one or both contact surfaces. Thus, the frictional connection between the two contact surfaces may be improved.

[0033] According to one embodiment, the sonotrode opening may be surrounded by the contact surface of the sonotrode in the form of a ring and / or a ring segment. Additionally or alternatively, the sonotrode carrier opening may be surrounded by the contact surface of the sonotrode carrier in the form of a ring and / or a ring segment. This can simplify the orientation of the sonotrode relative to the sonotrode carrier, especially if the sonotrode is fastened to the sonotrode carrier via only one screw.

[0034] According to one embodiment, the sonotrode opening may be surrounded by at least one ring-shaped and / or ring segment-shaped roughened section of the contact surface of the sonotrode. Additionally or alternatively, the sonotrode carrier opening may be surrounded by at least one ring-shaped and / or ring segment-shaped roughened section of the contact surface of the sonotrode carrier. Unintentional rotation of the sonotrode relative to the sonotrode carrier during the welding operation can be effectively avoided, especially if the sonotrode is fastened to the sonotrode carrier via only one screw.

[0035] According to one embodiment, at least one of the contact surfaces can include a stripe pattern consisting of several stripe-shaped roughened sections. The stripe-shaped sections can be oriented in the same or different directions. It is advantageous if the stripe-shaped sections are distributed, in particular evenly, over the entire contact surface. The stripe pattern can be produced, for example, by laser processing of the sonotrode or the sonotrode carrier. In tests with this embodiment, it was possible to achieve particularly good results.

[0036] According to one embodiment, the roughened sections of the stripe pattern may be arranged parallel to one another. In this case, the roughened sections of the same or different contact surfaces may be arranged parallel to one another. Each roughened section of the stripe pattern may additionally extend parallel to the longitudinal direction of the sonotrode. In tests with this embodiment, it was also possible to achieve particularly good results.

[0037] According to one embodiment, the roughened section of the at least partially roughened contact surface has an average roughness depth R z is greater than 2,0 μm and / or the arithmetic mean roughness value R of the roughened section aSuch lower threshold values ​​have been shown in tests to be particularly useful.

[0038] According to one embodiment, the average roughness depth R z may be smaller than 14 μm. Additionally or alternatively, the arithmetic mean roughness value R a may be less than 3.0 μm. Such an upper threshold has been shown to be particularly useful in testing.

[0039] For example, the following roughness values ​​were measured in tests:

[0040] In the contact surface section roughened by blasting with glass pearls, R a For 0.53 μm, R z For 3.29 μm, In the section of the contact surface roughened by laser treatment, R a For R, 2.43 μm z For 13.27 μm, In the non-roughened, i.e. untreated or only polished, sections of the contact surface have R a For 0.16 μm, R z For 0.90 μm.

[0041] According to one embodiment, the sonotrode can be embodied as a flexural resonator comprising a base and at least one flexural arm protruding from the base. The sonotrode can be interchangeably fastened to a sonotrode carrier via the base, which may comprise the contact surface of the sonotrode. This has the effect that the sonotrode is excited to perform transverse vibrations, i.e. elastically deforms in a wavy line in the vibrating state. In this case, the sonotrode can have several points, also called zero crossings, at which their deflection relative to the virtual zero line is zero or negligibly small. This embodiment makes it possible to weld even workpieces that are difficult to access.

[0042] It is possible that the base represents the widest part of the sonotrode, and the bending arms may be embodied at least in part so as to be significantly narrower and / or thinner than the base. Sonotrodes in the form of rod-shaped bending resonators are also possible. For example, the cross section of the bending arms may taper with increasing distance from the base. The free end of the bending arms can thus also be moved towards workpieces that are difficult to access without the strength of the bending arms being significantly impaired. To allow the bending arms to vibrate freely, the bending arms must not come into contact with the sonotrode carrier. In other words, it is possible that the sonotrode, in the vibrating state, i.e. during the welding operation, only with its base, comes into contact with the sonotrode carrier. During the welding operation, the bending arms can only come into contact with the workpieces to be welded with their free ends.

[0043] For example, a flexural resonator may include two flexural arms projecting in opposite directions from a substrate.

[0044] According to an embodiment, the processing of the contact surfaces of the sonotrode and / or sonotrode carrier may comprise laser treatment, mechanical processing by blasting with a blasting agent or a combination of the two. Thus, the processing of the sonotrode or sonotrode carrier may be performed particularly precisely. By laser treatment, the relevant contact surfaces may for example be melted pointwise at several points by laser pulses. In this case, microscopically small bumps may be formed at the relevant points as a function of the selected laser parameters, this small bump having the effect of microtoothing. For example, by laser treatment it is possible to generate precise stripe patterns consisting of several stripe-shaped roughened sections (see further above). However, ring-shaped and / or ring segment-shaped patterns are also conceivable, for example patterns consisting of several concentric rings and / or concentric ring segments. For example, glass pearls or sand are suitable as blasting agents. Other blasting agents are also possible.

[0045] It should also be pointed out that possible features and advantages of embodiments of the present invention are described above and below partly with reference to an ultrasonic welding device, partly with reference to a method for manufacturing a correspondingly adapted sonotrode of an ultrasonic welding device, and partly with reference to a method for manufacturing a correspondingly adapted sonotrode carrier of an ultrasonic welding device. Those skilled in the art will recognize that the features described for individual embodiments can be transferred and / or adjusted and / or exchanged in a similarly appropriate manner in other embodiments in order to arrive at further embodiments of the present invention and possibly synergistic effects.

[0046] Advantageous embodiments of the invention are described in more detail below with reference to the accompanying drawings, neither of which should be construed as limiting the invention, and neither of which drawings nor the description should be construed as limiting the invention. [Brief description of the drawings]

[0047] [Figure 1] FIG. 1 illustrates an ultrasonic welding apparatus according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of a sonotrode carrier of an ultrasonic welding apparatus according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a side view of the sonotrode carrier. [Figure 4] FIG. 2 is a cross-sectional view of a one-time screwable sonotrode of an ultrasonic welding device according to one embodiment of the present invention. [Diagram 5] FIG. 2 is a cross-sectional view of a two-times screwable sonotrode of an ultrasonic welding device according to one embodiment of the present invention. [Figure 6] FIG. 13 is a cross-sectional view of a twice-threadable sonotrode of an ultrasonic welding device according to a further embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] The drawings are purely schematic and not to scale. Identical reference numbers indicate identical features or features with identical action in the various drawings.

[0049] 1 shows an ultrasonic welding device 1 comprising a sonotrode carrier 2 and a sonotrode 3, by means of which ultrasonic vibrations can be generated (the vibration direction of the sonotrode carrier 2 is indicated by a double arrow). The sonotrode 3 is replaceably attached to the sonotrode carrier 2, here via a screw 4 at the free end of the sonotrode carrier 2. The sonotrode 3 and the sonotrode carrier 2 both have a contact surface 5 where they come into contact with each other.

[0050] The two contact surfaces 5 may be pressed against each other with a defined clamping force via the screw 4 .

[0051] At least one of the two contact surfaces 5 is at least partially roughened. Thus, the frictional connection between the two contact surfaces 5 can be improved.

[0052] The sonotrode carrier 2 may include a converter 6 for converting a high-frequency voltage into mechanical ultrasonic vibrations and a booster 7 for transmitting the ultrasonic vibrations to the sonotrode 3. The booster 7 may be formed to appropriately change the amplitude of the ultrasonic vibrations. The sonotrode 3 may be correspondingly fastened to the free end of the booster 7. Fastening of the sonotrode 3 to the converter 6 is also possible. In this case, the booster 7 may be omitted. The sonotrode carrier 2 may further include a generator for supplying a voltage.

[0053] In this example, the sonotrode 3 is embodied as a bent resonator comprising a base 8 and two bent arms 9 projecting oppositely from the base 8. However, sonotrodes 3 with only one bent arm 9 are also possible. The sonotrode 3 is fastened to the sonotrode carrier 2 via the base 8 and only contacts the sonotrode carrier 2 at the base 8. The contact surface 5 of the sonotrode 3 is thus provided by the base 8.

[0054] As an example, two partially overlapping plate-shaped workpieces 11 are placed between one free end of the bending arm 9 and the anvil 10. The two workpieces 11 are welded together by means of the vibrating sonotrode 3.

[0055] In contrast to the illustration shown in FIG. 1, the anvil 10 may alternatively be at least partially formed by at least one of the workpieces 11 themselves.

[0056] As can be seen in Fig. 2, the contact surface 5 of the sonotrode carrier 2 can have a central sonotrode carrier opening 12 into which the screw 4 can be screwed. The contact surface 5 of the sonotrode carrier 2 can surround the sonotrode carrier opening 12, for example in the shape of a ring.

[0057] The contact surface 5 of the sonotrode 3 can have a corresponding sonotrode opening 13 through which the screw 4 can be guided. Likewise, the contact surface 5 of the sonotrode 3 can surround the sonotrode opening 13 in the form of a ring (see FIG. 4 ).

[0058] The contact surface 5 of the sonotrode carrier 2 can include a roughened section 14 , the roughness of which is significantly greater than the remaining contact surface 5 .

[0059] For example, the roughened section 14 has an average roughness depth R of 2.0 μm to 14 μm. z may have the following structure:

[0060] Additionally or alternatively, the roughened section 14 may have an arithmetic mean roughness value R of, for example, 0.3 μm to 3.0 μm. a may have the following structure:

[0061] The roughened section 14 can surround the sonotrode carrier opening 12 in the form of a ring, similar to the contact surface 5. However, an arrangement of the roughened section 14 in the form of one or more ring segments is also possible, as in Fig. 4 using the example of a sonotrode. An arrangement of the roughened section 14 in the form of several concentric rings and / or ring segments is likewise conceivable.

[0062] The roughened section 14 or multiple roughened sections 14 may be overall smaller in terms of surface area than the respective contact surface 5, or may be exactly the same size as the respective contact surface 5, i.e. the entire contact surface 5 may be roughened.

[0063] The contact surface 5 of the sonotrode carrier 2 can be formed by a planar ridge 15 on the face side of the sonotrode carrier 2, as shown in Fig. 3. It is thus possible to prevent, for example, the bending arm 9 from contacting the sonotrode carrier 2 in a vibrating state.

[0064] In contrast to the embodiments shown in Figures 4, 5 and 6, alternatively or additionally the sonotrode 3, for example its base 8, may preferably be embodied with such a planar ridge.

[0065] Alternatively or in addition to the sonotrode carrier 2, the contact surface 5 of the sonotrode 3 may be at least partially correspondingly roughened. Figure 4 shows an example of a sonotrode 3 with four ring segment shaped roughened sections 14 in the contact surface 5 of the sonotrode 3.

[0066] As can be seen in Fig. 5, a stripe pattern 16 with several stripe-shaped roughened sections 14 is also possible. The sections 14 of the stripe pattern 16 are here, by way of example, oriented parallel to one another and distributed across the width of the rectangular contact surface 5 of the sonotrode 3. However, it is also possible for the stripe pattern 16 to have its sections 14 oriented in different directions, for example perpendicular to one another.

[0067] Furthermore, in this example, the contact surface 5 has two sonotrode openings 13 for receiving in each case a screw 4 (the sonotrode carrier 2 may correspondingly also have two sonotrode carrier openings 12). Here, at least one of the sections 14 of the striped pattern 16 may be located between the sonotrode openings 13 and / or at least one of the sonotrode openings 13 may be located between two sections 14 of the striped pattern 16.

[0068] Alternatively, the entire contact surface 5 of the sonotrode 3 may be roughened (see FIG. 6).

[0069] It should be noted that the examples given above with reference to the sonotrode 3 for the roughened contact surface 5 can correspondingly be applied to the sonotrode carrier 2 and vice versa.

[0070] During installation, the sonotrode 3 may be fixedly screwed to the sonotrode carrier 2 with a defined tightening torque such that the contact surfaces 5 are in full contact with each other and remain in contact during the welding operation.

[0071] The contact surface 5 of the sonotrode 3 and / or the sonotrode carrier 2 may for example be machined, preferably by grinding or milling.

[0072] If the sonotrode 3 is made of a harder material than the sonotrode carrier 2, as is often the case, a friction-increasing structure comprising one or more roughened sections 14 should be created on the sonotrode 3. Thus, the penetration of the structure into the (softer) sonotrode carrier 2 is simplified. However, the reverse is also possible. The structure can be updated substantially simultaneously by replacing the sonotrode 3, which was previously the mounting part.

[0073] If the sonotrode carrier 2 has a similar hardness as the sonotrode 3, structures can be created, for example by laser treatment on the sonotrode 3, resulting in a local increase in the hardness of the sonotrode 3.

[0074] The structure should be embodied in such a way that a uniform pressure profile at the contact surface 5 is generated. The structure should furthermore be embodied in such a way that the sonotrode 3 remains properly connected to the contact surface 5 of the sonotrode carrier 2 in a vibrating state. A suitable structure in this sense can be generated by blasting, laser machining and / or erosion of one or both contact surfaces 5.

[0075] It should finally be pointed out that terms such as "having", "comprising" do not exclude other elements or steps, and indefinite articles such as "a" do not exclude a plurality. It should further be pointed out that features or steps described with reference to one of the above embodiments may also be used in combination with features or steps described with reference to other of the above embodiments. Signs in the claims should not be considered as limiting. [Explanation of symbols]

[0076] 1 Ultrasonic welding equipment 2 Sonotrode carrier 3. Sonotrode 4 Screws 5 Contact surface 6. Converter 7 Booster 8 Base 9 Bending Arm 10. Anvil 11 Workpiece 12 Sonotrode carrier opening 13 Sonotrode opening 14 Roughened Section 15 Planar ridge 16 Stripe Pattern

Claims

1. An ultrasonic welding device (1), comprising: Sonotrode (3) and a sonotrode carrier (2) configured to generate ultrasonic vibrations of the sonotrode (3), the sonotrode (3) and the sonotrode carrier (2) both have contact surfaces (5), at least one of the contact surfaces (5) being at least partially roughened; An ultrasonic welding device (1), wherein the sonotrode (3) is exchangeably fastened to the sonotrode carrier (2) such that the contact surfaces (5) are pressed against each other.

2. the sonotrode (3) is replaceably fastened to the sonotrode carrier (2) via at least one screw (4); 2. An ultrasonic welding device (1) according to claim 1.

3. the screw (4) is introduced into a sonotrode opening (13) of the sonotrode (3), the sonotrode opening (13) being at least partially surrounded by the contact surface (5) of the sonotrode (3), and / or the screw (4) is introduced into a sonotrode carrier opening (12) of the sonotrode carrier (2), the sonotrode carrier opening (12) being at least partially surrounded by the contact surface (5) of the sonotrode carrier (2); 3. An ultrasonic welding device (1) according to claim 2.

4. the sonotrode opening (13) is surrounded by the contact surface (5) of the sonotrode (3) in the form of a ring and / or a ring segment, and / or the sonotrode carrier opening (12) is surrounded by the contact surface (5) of the sonotrode carrier (2) in the form of a ring and / or a ring segment, 4. An ultrasonic welding device (1) according to claim 3.

5. the sonotrode opening (13) is surrounded by at least one ring-shaped and / or ring-segment-shaped roughened section (14) of the contact surface (5) of the sonotrode (3), and / or the sonotrode carrier opening (12) is surrounded by at least one ring-shaped and / or ring-segment-shaped roughened section (14) of the contact surface (5) of the sonotrode carrier (2), An ultrasonic welding device (1) according to claim 3 or 4.

6. At least one of the contact surfaces (5) comprises a stripe pattern (16) made up of several stripe-shaped roughened sections (14), An ultrasonic welding device (1) according to any one of the preceding claims.

7. the roughened sections (14) of the stripe pattern (16) are arranged parallel to one another; 7. An ultrasonic welding device (1) according to claim 6.

8. The roughened section (14) of the at least partially roughened contact surface (5) has a mean roughness depth R of at least 2.0 μm. ｚ and / or an arithmetic mean roughness value R of at least 0.3 μm ａ having An ultrasonic welding device (1) according to any one of the preceding claims.

9. The average roughness depth R ｚ is at most 14 μm, and / or The arithmetic mean roughness value R ａ is at most 3.0 μm; 9. An ultrasonic welding device (1) according to claim 8.

10. The sonotrode (3) is embodied as a flexural resonator comprising a base (8) and at least one flexural arm (9) protruding from the base (8), the sonotrode (3) is replaceably fastened to the sonotrode carrier (2) via the base body (8), the base body (8) comprising the contact surface (5) of the sonotrode (3); An ultrasonic welding device (1) according to any one of the preceding claims.

11. A method for manufacturing a sonotrode (3) for an ultrasonic welding device (1) according to any one of claims 1 to 10, comprising the steps of: Providing said sonotrode (3) in the condition to be treated; and treating the sonotrode (3) to at least partially roughen the contact surface (5) of the sonotrode (3).

12. A method for manufacturing a sonotrode carrier (2) for an ultrasonic welding device (1) according to any one of claims 1 to 10, comprising the steps of: Providing said sonotrode carrier (2) in the condition to be treated; and treating the sonotrode carrier (2) to at least partially roughen the contact surface (5) of the sonotrode carrier (2).

13. The treatment comprises a mechanical treatment by laser treatment and / or blasting with a blasting agent; 13. The method according to claim 11 or 12.

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