Welding head for ultrasonic welding and ultrasonic welding equipment

Abstract

The utility model provides a welding head for ultrasonic welding and ultrasonic welding equipment, and the welding head for ultrasonic welding comprises a welding seat, a welding rod and a welding rod, the insection unit is arranged on the end face of the welding seat; each insection unit comprises a plurality of welding teeth which are arranged in an array mode; the edge of each insection unit is in a sawtooth shape. According to the welding head for ultrasonic welding, the edges of the insection units are arranged to be sawtooth-shaped, so that when the welding head is used for welding workpieces, the situation that welding spots are broken due to over-welding of the workpieces can be effectively avoided, and the welding yield of the workpieces can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic welding, in particular to a welding head for ultrasonic welding and ultrasonic welding equipment. Background Art

[0002] Ultrasonic welding refers to a high-frequency mechanical vibration (greater than 20kHZ frequency), which is transmitted to the surface of the workpiece to be welded through the welding tool head. The interface metal produces plastic flow and diffusion under the combined action of friction and ultrasonic softening, so that the connection area gradually increases and finally forms a reliable connection. It is applicable to a wide range of industries, including plastics, electronics, electrical appliances, auto parts, packaging and other industries.

[0003] The welding head (also known as sonic tool) is a general term for the ultrasonic transmitting end, which can couple the ultrasonic wave generated by the transducer into the object being processed. The welding head is provided with teeth, which are the lines in the welding area of ​​the welding head, and can transmit the mechanical vibration of the welding head to the workpiece.

[0004] The tooth structure of the existing welding head mostly uses a trapezoidal model, such as an ultrasonic eccentric welding head disclosed in the patent application with application number CN202123313363.5, in which a single welding tooth is in the shape of an isosceles trapezoidal regular quadrangular pyramid. Another example is that the patent application with application number CN202111424654.3 discloses an ultrasonic welding welding head structure, which includes a middle welding tooth with an overall structure of an isosceles trapezoid, and side welding teeth symmetrically arranged on both sides thereof. The overall structure of each side welding tooth is a right-angled trapezoid, that is, a non-isosceles trapezoidal quadrangular pyramid, which can be collectively referred to as a trapezoidal welding head. However, in the actual welding process, these two types of trapezoidal welding heads are neatly arranged, such as Figure 1 As shown, each outer edge of the bottom surface of the overall structure corresponds to each welding edge, and the outer edges of the bottom surfaces of the trapezoidal welding heads constituting each welding edge extend along the same straight line, so that the indentation edge 5 formed by the welding head on the workpiece is linear, which can easily lead to over-welding of the workpiece 4 and weld fracture, which is not conducive to improving the welding quality rate of the workpiece 4. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the main purpose of the utility model is to provide an ultrasonic welding horn and an ultrasonic welding device. The edge of the tooth pattern unit of the ultrasonic welding horn provided is set to be serrated. When using it to weld workpieces, it can effectively avoid the situation where the weld point is broken due to over-welding of the workpiece, which is beneficial to improving the quality rate of workpiece welding.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] The utility model provides a welding head for ultrasonic welding, which comprises:

[0008] A welding seat, wherein the welding seat has an end surface;

[0009] A tooth pattern unit is arranged on the end surface of the welding seat; the tooth pattern unit includes a plurality of welding teeth arranged in an array; and the edge of the tooth pattern unit is serrated.

[0010] As a further description of the above technical solution, each of the welding teeth is a quadrangular pyramid structure or a quadrangular cone structure, and the angle between the bottom edge of any welding tooth and any cross-sectional edge of the welding seat is an acute angle.

[0011] As a further description of the above technical solution, a working area and a non-working area are provided on the end surface of the welding seat, and the tooth pattern unit is arranged in the working area.

[0012] As a further description of the above technical solution, the ratio of the cross-sectional area of ​​the working area and the non-working area of ​​the welding seat is not less than 3:1.

[0013] As a further description of the above technical solution, the non-working area is arranged around the outside of the working area.

[0014] As a further description of the above technical solution, the tooth pitch between two adjacent welding teeth in the same working area is 0.50mm-0.60mm.

[0015] As a further description of the above technical solution, the distance between the top end of each welding tooth away from the end surface of the welding seat and the end surface of the welding seat is 0.20mm-0.25mm.

[0016] The utility model also provides an ultrasonic welding device, comprising the ultrasonic welding welding head as described above.

[0017] By means of the above technical solution, the outstanding effects of the utility model are:

[0018] The ultrasonic welding horn provided by the utility model still includes a welding seat provided with an end face and a tooth pattern unit provided on the end face of the welding seat, but unlike the prior art, the multiple welding teeth included in the tooth pattern unit are still arranged in an array, but the edge of the tooth pattern unit formed by the array arrangement is serrated, so that when welding the workpiece, the indentation edge formed on the workpiece by the ultrasonic welding horn still extends along the same straight line, but the indentations of each welding tooth constituting the indentation edge are all point-shaped on the extended straight line, which is different from the prior art in which the indentations of each welding tooth constituting the indentation edge are all linear on the extended straight line, thereby staggering the stress points of the workpiece, effectively preventing the workpiece from having a weld point break due to over-welding, and effectively improving the welding quality rate of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a plane state of welding an FPC and an aluminum bar using an ultrasonic welding horn in the prior art;

[0020] Figure 2 A longitudinal cross-sectional view of an ultrasonic welding horn in an embodiment of the utility model;

[0021] Figure 3 It is a simplified plan view of the ultrasonic welding horn in the first embodiment of the utility model;

[0022] Figure 4 It is a schematic plan view of a tooth pattern unit of an ultrasonic welding horn in the first embodiment of the utility model;

[0023] Figure 5 It is a simplified plan view of a welding head for ultrasonic welding in the second embodiment of the utility model;

[0024] Figure 6 It is a simplified plan view of a welding head for ultrasonic welding in the third embodiment of the utility model;

[0025] Figure 7 It is a simplified plan view of a welding head for ultrasonic welding in the fourth embodiment of the utility model;

[0026] Figure 8 It is a schematic diagram of the planar state of FPC and aluminum bar being welded using the ultrasonic welding horn in the embodiment of the utility model.

[0027] Description of Figure Numbers:

[0028] 1. Welding seat; 11. End face; 2. Tooth pattern unit; 21. Edge; 3. Welding tooth; 4. Workpiece; 5. Indentation edge; 1. Tooth pitch between two adjacent welding teeth in the same working area; h. Distance between the top end of each welding tooth away from the end face of the welding seat and the end face of the welding seat. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0031] See also Figures 2 to 8 The utility model discloses an ultrasonic welding horn, which comprises:

[0032] A welding seat 1, wherein the welding seat 1 has an end surface 11;

[0033] The tooth pattern unit 2 is arranged on the end surface 11 of the welding seat 1; the tooth pattern unit 2 includes a plurality of welding teeth 3 arranged in an array; and the edge 21 of the tooth pattern unit 2 is serrated.

[0034] In the above-mentioned setting method, the ultrasonic welding horn still includes a welding seat 1 provided with an end face 11 and a tooth pattern unit 2 provided on the end face 11 of the welding seat 1, but different from the prior art, at this time, although the multiple welding teeth 3 included in the tooth pattern unit 2 are still arranged in an array, the edge 21 of the tooth pattern unit 2 formed by its array arrangement is serrated, so that when welding the workpiece 4, the indentation edge 5 formed by the ultrasonic welding horn on the workpiece 4 still extends along the same straight line, but the indentations of each of the welding teeth 3 constituting the indentation edge 5 are all point-shaped on the extended straight line, which is different from the prior art in which the indentations of each of the welding teeth 3 constituting the indentation edge 5 are all linear on the extended straight line, thereby staggering the force points of the workpiece 4, effectively preventing the workpiece 4 from having weld point breakage due to over-welding, and effectively improving the welding quality rate of the workpiece 4.

[0035] See also Figure 2 , Figure 3 as well as Figures 5 to 7Specifically, in the four embodiments, the end face 11 of each welding head is square, and each welding tooth 3 in the tooth pattern unit 2 provided on the end face 11 is a quadrangular pyramid structure, and the angle between the bottom edge of any welding tooth 3 and any cross-sectional edge of the welding seat 1 is an acute angle, so that after the plurality of welding teeth 3 are arranged in an array, the edge 21 of the tooth pattern unit 2 is serrated. Of course, in other embodiments, each welding tooth 3 may also be a quadrangular pyramid structure, so that it can penetrate into the material to play a tightening role during welding, ensure the smooth transmission of ultrasonic vibration energy, and thus improve the welding accuracy.

[0036] See also Figures 2 to 7 Specifically, in the four embodiments, the end face 11 of the welding seat 1 is provided with a working area and a non-working area. The working area is used to set the tooth pattern unit 2 to weld the workpiece 4, and the non-working area can be directly left vacant. More specifically, the ratio of the cross-sectional area of ​​the working area to the non-working area is not less than 3:1. In other words, after the multiple welding teeth 3 set in the tooth pattern unit 2 complete the welding of the workpiece 4, the actual welding area is ensured to be not less than 75% of the total area of ​​the workpiece 4 to be welded to meet the welding requirements. Of course, in actual production, the ratio of the cross-sectional area of ​​the working area to the non-working area of ​​the end face 11 of the welding seat 1 can be specifically set according to the actual welding requirements.

[0037] Specifically, in the first and third embodiments, the end face 11 of the welding seat 1 is provided with a working area, and a plurality of non-working areas are provided at the outer edge of the working area. In the second and fourth embodiments, the end face 11 of the welding seat 1 is provided with two working areas separated by a non-working area, and the non-working area is provided between the two working areas and at the outer edge of the two working areas. Of course, in other embodiments, while ensuring the actual welding area, the number of working areas and non-working areas provided on the end face 11 of the welding seat 1 may also be other values, so that the serrated edge 21 of the tooth pattern unit 2 of the working area can be maximized while the non-working area is at the edge of the working area. Furthermore, when the ultrasonic welding horn is used to weld the workpiece 4, the force points of the workpiece 4 can be staggered to form point-shaped tooth marks spaced farther apart along the extension direction of the indentation, so as to form a structure such as Figure 8 The indented edge 5 shown makes the workpiece 4 (eg, FPC) less likely to break.

[0038] Specifically, in the first and second embodiments, the tooth pitch l between two adjacent welding teeth 3 in the same working area is 0.50 mm, and in the third and fourth embodiments, the tooth pitch l between two adjacent welding teeth 3 in the same working area is 0.60 mm. Of course, in other embodiments, the tooth pitch l between two adjacent welding teeth 3 in the same working area can also be other values ​​between 0.50 mm and 0.60 mm.

[0039] Specifically, in the first and second embodiments, the distance h between the top of each welding tooth 3 away from the end face 11 of the welding base 1 and the end face 11 of the welding base 1 is 0.20 mm, that is, the tooth depth of each welding tooth 3 is 0.20 mm. In the third and fourth embodiments, the distance h between the top of each welding tooth 3 away from the end face 11 of the welding base 1 and the end face 11 of the welding base 1 is 0.25 mm, that is, the tooth depth of each welding tooth 3 is 0.25 mm. Of course, in other embodiments, the distance h between the top of each welding tooth 3 away from the end face 11 of the welding base 1 and the end face 11 of the welding base 1 can also be set to other values ​​between 0.20 mm and 0.25 mm according to actual needs.

[0040] Specifically, the utility model further provides an ultrasonic welding device, including the ultrasonic welding horn as described above, and the ultrasonic welding horn is not described in detail here.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A horn for ultrasonic welding, characterized in that: include: A welding seat, wherein the welding seat has an end surface; A tooth pattern unit is arranged on the end surface of the welding seat; the tooth pattern unit includes a plurality of welding teeth arranged in an array; and the edge of the tooth pattern unit is serrated.

2. The ultrasonic welding horn according to claim 1, characterized in that: Each of the welding teeth is a quadrangular pyramid structure or a quadrangular cone structure, and the angle between the bottom edge of any welding tooth and any cross-sectional edge of the welding seat is an acute angle.

3. The ultrasonic welding horn according to claim 1, characterized in that: A working area and a non-working area are provided on the end surface of the welding seat, and the tooth pattern unit is arranged in the working area.

4. The ultrasonic welding horn according to claim 3, characterized in that: The ratio of the cross-sectional area of ​​the working area to the non-working area of ​​the welding seat is not less than 3:

1.

5. The ultrasonic welding horn according to claim 3, characterized in that: The non-working area is arranged around the outside of the working area.

6. The ultrasonic welding horn according to claim 3, characterized in that: The tooth pitch between two adjacent welding teeth in the same working area is 0.50mm-0.60mm.

7. The ultrasonic welding horn according to claim 1, characterized in that: The distance between the top end of each welding tooth away from the end surface of the welding seat and the end surface of the welding seat is 0.20mm-0.25mm.

8. An ultrasonic welding device, characterized in that: It comprises the ultrasonic welding horn as described in any one of claims 1 to 7.

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