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 include a sonotrode carrier to which a sonotrode can be interchangeably fastened. The ultrasonic vibrations of the sonotrode can be brought about by the sonotrode carrier, and the energy of the vibrations 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 types of sonotrodes, such as sonotrodes for spot or roll seam welding, or sonotrodes in the form of a flexural resonator that can be used even in difficult-to-access areas (to name just a few).

[0003] The sonotrode can be screwed onto the sonotrode carrier via one or more screws. Deviations in the tightening torque of the screw(s), for example as a result of using an incorrect tool or as a result of dirty or defective mating surfaces, can significantly affect the vibration characteristics of the sonotrode and therefore 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 mating surfaces, which can negatively affect 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, there may be a need for a correspondingly improved method for manufacturing a sonotrode carrier.

[0007] These requirements can 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 present invention is The method according to claim 1 The present invention relates to an ultrasonic welding device. The ultrasonic welding device includes 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 referred to as coupling surfaces. At least one of the contact surfaces is at least partially roughened. The sonotrode is replaceably fastened to the sonotrode carrier so that the contact surfaces are pressed against each other.

[0009] A second aspect of the present invention is a method for manufacturing a sonotrode for an ultrasonic welding device, as described above and below. , as claimed in claim 8 The method comprises 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 present invention is a method for manufacturing a sonotrode carrier for an ultrasonic welding device, as described above and below. , as claimed in claim 9 The method comprises at least one step of providing a sonotrode carrier in an as-treated state 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 device may also be understood as features of the above and below methods, and vice versa.

[0012] Without limiting the scope of the present invention in any way, embodiments of the present 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 crucial for the quality of the welding result. How good this connection is can depend on various influencing factors, such as whether the specified tightening torque of the screws is adhered to, the cleanliness of the contact surfaces, or the production-specific surface properties of the contact surfaces.

[0014] The approach presented here therefore makes the connection between the sonotrode and the sonotrode carrier significantly less sensitive to contamination, for example with oil or grease, to errors in the maintenance and installation of the sonotrode, and to variations in the production of the associated components, and in fact does not result in the creation of undesirable notches on the sonotrode and / or sonotrode carrier, which, even if relatively small, could lead to damage given the high levels of strain to which the sonotrode or sonotrode carrier are subjected during the welding operation.

[0015] This is achieved, in principle, by increasing the friction between the sonotrode and the sonotrode carrier in a suitable manner by targeting roughening of one or both contact surfaces, or at least one section thereof. In other words, by using a suitable processing method to correspondingly roughen the sonotrode and / or the sonotrode carrier, one or more roughened sections can be created in one or both contact surfaces that can engage with a corresponding counterpart, e.g., one or more sections that are not roughened and / or one or more sections of a corresponding roughened counterpart, at a microscopic level. Such micro-toothing ensures a reliable connection between the sonotrode and the sonotrode carrier during the welding operation, making it practically unnecessary to increase the clamping force with which the sonotrode and the sonotrode carrier are pressed against each other.

[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 test: distance of the rotational force application point from the center of the sonotrode: 78 mm, feed rate: 2 mm / min, tightening torque of the screw fastening the sonotrode to the sonotrode carrier: 20 Nm. The force was applied perpendicular to the longitudinal axis of the sonotrode.

[0018] In this case, it was possible to increase the torque from approximately 550 N for sonotrodes with unprocessed, i.e., non-specially roughened, contact surfaces to approximately 800 N for sonotrodes with laser-roughened contact surfaces, and even to 1,150 N for sonotrodes with glass-blasted contact surfaces. Thus, while maintaining the same tightening torque, it was possible to more than double the fastening stability. None of the tested sonotrodes exhibited significant vibration characteristics.

[0019] The increase in rotational force can be explained by the fact that a kind of positive locking, i.e., microtoothedness, is generated on a microscopic scale as a result of the defined structure in the contact surface on the sonotrode and / or sonotrode carrier. The structure can be embodied so that it penetrates the corresponding counterpart minimally, i.e., the sonotrode and sonotrode carrier do not contact the contact surface in a point-like or linear manner, but rather in a superficial manner. The structure used on the surface pressed together with the mating microtoothedness and / or structure may undergo slight elastic and / or plastic deformation. The protruding edges or apexes of the structure generated by roughening can slightly penetrate the material close to the mating surface, thus resulting in microtoothedness. The deformation may be only a few millimeters or even smaller, and may be significantly smaller than the structure 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 the 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 the macroscopically flat surface section of the sonotrode carrier where the sonotrode comes into contact with the contact surface of the sonotrode. The two contact surfaces can be covered 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 come into contact at their contact surfaces.

[0023] The contact surface may be roughened partially, i.e., in one or more coherent or discrete 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" in this context can be understood as a specially treated, i.e., a flat portion of the contact surface that, as a result of the special treatment, has a significantly greater roughness than a portion 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 be treated, for example, using mechanical, optical, electrical (e.g., erosion), electrochemical, or chemical methods for surface treatment, or a combination of at least two of these methods. In other words, the treatment can result in the formation of a special friction-increasing structure in the contact surface region, the friction-increasing properties of which may be the same in all directions, i.e., non-directional or isotropic, or may be different in different directions, i.e., directional or anisotropic.

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

[0026] The sonotrode carrier may include, for example, a converter and / or a booster. The sonotrode carrier may further include a generator. The sonotrode may be fastened to the free end of the sonotrode carrier (in the longitudinal direction), for example, to the booster or converter, so that the vibration axis, along which the sonotrode carrier can move back and forth, particularly 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 with a corresponding frequency within the ultrasonic range, for example between 20 kHz and 100 kHz, preferably between 20 kHz and 35 kHz.

[0029] The booster, also called a transmission or amplitude conversion piece, can be configured 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 modified ultrasonic vibrations to the sonotrode. The booster may further be configured 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 is configured to transmit these vibrations to one or more workpieces to be welded. For example, the sonotrode, especially when embodied as a two-arm bending resonator (see further below), can be configured to be symmetrical with respect to its longitudinal and / or transverse axes. Thus, uneven strains on the sonotrode can be avoided.

[0031] According to one embodiment, the sonotrode can be interchangeably fastened to the sonotrode carrier via at least one screw. In this case, the screw can press the contact surfaces together, allowing for controlled compression of the contact surfaces. This further simplifies sonotrode replacement. The sonotrode can also be interchangeably 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, and the sonotrode opening 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, and the sonotrode carrier opening may be at least partially surrounded by the contact surface of the sonotrode carrier. In other words, the thread may pass laterally, particularly vertically, through one or both contact surfaces. This may improve the frictional connection between the two contact surfaces.

[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. In particular, if the sonotrode is fastened to the sonotrode carrier via only one screw, unintentional rotation of the sonotrode relative to the sonotrode carrier during the welding operation can be effectively prevented.

[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 sections can be oriented in the same or different directions. It is advantageous if the stripe sections are distributed, particularly evenly, across the entire contact surface. The stripe pattern can be generated, for example, by laser processing of the sonotrode or the sonotrode carrier. In tests with this embodiment, particularly good results were achieved.

[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, particularly good results were achieved.

[0037] Small 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 a having a roughness characterized by a surface roughness of greater than 0.3 μm do.Such lower thresholds have been shown to be particularly practical in testing.

[0038] flat Uniform roughness depth R z is smaller than 14 μm Sai Additionally or alternatively, the arithmetic mean roughness value R a is smaller than 3.0 μm Sai Such an upper threshold has been shown to be particularly practical in trials.

[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 3.29 μm for In the contact surface section roughened by laser treatment, R a For R, 2.43 μm z For 13.27 μm, In the non-roughened, i.e. untreated or polished only, section of the contact surface, R a 0.16μm, R z For 0.90 μm.

[0041] S The notrode is embodied as a flexural resonator including a base and at least one flexural arm projecting from the base. will be The sonotrode may be interchangeably fastened to the sonotrode carrier via a base, which may comprise the contact surface of the sonotrode. This has the effect of exciting the sonotrode into transverse vibrations, i.e., elastically deforming in a wavy line when vibrating. In this case, the sonotrode may have several points, also known as zero crossing points, at which their deflection relative to the virtual zero line is zero or negligibly small. This embodiment makes it possible to weld even difficult-to-access workpieces.

[0042] The base may represent the widest part of the sonotrode, and the bending arms may be embodied at least partially 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 as the distance from the base increases. Thus, the free ends of the bending arms can also move toward difficult-to-access workpieces without significantly compromising their strength. To allow the bending arms to vibrate freely, they must not contact the sonotrode carrier. In other words, the sonotrode can only contact its base with the sonotrode carrier during vibration, i.e., during the welding operation. During the welding operation, the bending arms can only contact the workpiece 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 one embodiment, the processing of the contact surfaces of the sonotrode and / or sonotrode carrier can involve laser processing, mechanical processing by blasting with a blasting agent, or a combination of the two. Thus, the processing of the sonotrode or sonotrode carrier can be performed with particular precision. By laser processing, the relevant contact surfaces can be melted, for example, in a point-like manner at several points by laser pulses. In this case, microscopically small protrusions may be formed at the relevant points as a function of the selected laser parameters, which have a microtooth effect. For example, laser processing can generate precise stripe patterns consisting of several stripe-shaped roughened sections (see further above). However, ring-shaped and / or ring segment-shaped patterns, such as patterns consisting of several concentric rings and / or concentric ring segments, are also conceivable. 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 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. [Brief explanation of the drawings]

[0047] [Figure 1] 1 illustrates an ultrasonic welding device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of a sonotrode carrier of an ultrasonic welding apparatus according to an embodiment of the present invention. [Figure 3] FIG. 1 is a side view of a sonotrode carrier. [Figure 4] 1 is a cross-sectional view of a one-time screw-in sonotrode of an ultrasonic welding device according to one embodiment of the present invention. [Figure 5] 1 is a cross-sectional view of a two-times threadable sonotrode of an ultrasonic welding device according to one embodiment of the present invention. [Figure 6] FIG. 10 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 INVENTION

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

[0049] 1 shows an ultrasonic welding apparatus 1 including 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 together with a defined clamping force via the screw 4 .

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

[0052] The sonotrode carrier 2 may include a converter 6 for converting 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 configured 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 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 voltage.

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

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

[0056] As can be seen in Figure 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 form 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 can have:

[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

[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 Figure 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 also conceivable.

[0062] The roughened section 14 or sections 14 may be smaller overall 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 flat raised portion 15 on the face side of the sonotrode carrier 2, as shown in Figure 3. This can therefore prevent the bending arm 9 from coming into contact with the sonotrode carrier 2, for example, 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 body 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 having four ring-segment shaped roughened sections 14 in the contact surface 5 of the sonotrode 3.

[0066] 5, a stripe pattern 16 having 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, the stripe pattern 16 can also 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 also have two sonotrode carrier openings 12 correspondingly). Here, at least one of the sections 14 of the stripe 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 stripe 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 onto the sonotrode carrier 2 with a defined tightening torque so 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 be machined, for example, 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. This simplifies the penetration of the structure into the (softer) sonotrode carrier 2. However, the reverse is also possible. The structure can be updated virtually simultaneously by replacing the sonotrode 3, which was previously the mounting part.

[0073] If the sonotrode carrier 2 has a similar hardness to the sonotrode 3, structures can be produced, 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 is generated at the contact surface 5. The structure should further 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" and "comprising" do not exclude other elements or steps, and that 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. Reference 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 sections 15 Planar ridge 16 Stripe Pattern

Claims

1. An ultrasonic welding device (1), 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; 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 and 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, the sonotrode (3) is exchangeably fastened to the sonotrode carrier (2) so that the contact surfaces (5) are pressed against each other; 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 (8), the base (8) comprising the contact surface (5) of the sonotrode (3); the sonotrode (3) is replaceably fastened to the sonotrode carrier (2) via at least one screw (4); the screw (4) is introduced into the 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 the 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); An ultrasonic welding device (1) that satisfies at least one of the following options: (A) 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), (B) at least one of said contact surfaces (5) includes a stripe pattern (16) consisting of several stripe-shaped roughened sections (14);

2. 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; 2. An ultrasonic welding device (1) according to claim 1.

3. the roughened sections (14) of the stripe pattern (16) are arranged parallel to one another; 2. An ultrasonic welding device (1) according to claim 1.

4. A method for manufacturing a sonotrode (3) for an ultrasonic welding device (1) according to any one of claims 1 to 3, comprising: providing the sonotrode (3) in an as-treated state, wherein 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) being exchangeably fastened to the sonotrode carrier (2) via the base (8), the base (8) comprising the contact surface (5) of the sonotrode (3); treating the sonotrode (3) to at least partially roughen the contact surface (5) of the sonotrode (3), wherein a 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 and 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.

5. A method for manufacturing a sonotrode carrier (2) for an ultrasonic welding device (1) according to any one of claims 1 to 3, comprising the steps of: providing the sonotrode carrier (2) in an as-treated state, the sonotrode carrier (2) being configured to generate ultrasonic vibrations of the sonotrode, the sonotrode (3) being embodied as a bending resonator comprising a base (8) and at least one bending arm (9) protruding from the base (8), the sonotrode (3) being exchangeably fastened to the sonotrode carrier (2) via the base (8), the base (8) comprising the contact surface (5) of the sonotrode (3); Treating the sonotrode carrier (2) to at least partially roughen the contact surface (5) of the sonotrode carrier (2), wherein a 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 and 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.

6. The treatment comprises a mechanical treatment by laser treatment and / or blasting with a blasting agent, The method according to claim 4 or 5.

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