Ultrasonic welding machine and welding method

Abstract

The invention relates to the technical field of welding devices, aims to solve the problem of how to improve the consistency of the welding quality of an ultrasonic welding machine, and provides an ultrasonic welding machine and a welding method. The ultrasonic welding machine comprises a supporting piece, a welding head and a driving assembly. The supporting piece is used for supporting a to-be-welded target piece, the supporting piece is provided with a supporting face used for being attached to the target piece, and the supporting face comprises a welding datum plane. The welding head is provided with a reference position attached to the welding reference face, the welding head is further provided with a welding starting position and a welding ending position, the welding starting position deviates by a first distance with the reference position as the reference, the welding ending position deviates by a second distance with the reference position as the reference, and the first distance is larger than the second distance. The driving assembly is in transmission connection with the welding head and used for driving the welding head to move from the welding starting position to the welding ending position. The method has the beneficial effects that the influence on the surface position of the target piece caused by deformation or size deviation of the target piece is eliminated, and the consistency of welding quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of welding devices, and in particular to an ultrasonic welding machine and a welding method. Background Art

[0002] An ultrasonic welding machine is provided in the related technology. Before starting welding, the ultrasonic welding machine uses the upper surface of the target part to be welded as the welding reference plane, then lifts it a certain height from the welding reference plane to the welding starting position, starts emitting ultrasonic waves from the welding starting position, and then moves to the welding ending position and stops emitting ultrasonic waves.

[0003] However, the surface position of the target part is prone to deviation, resulting in low consistency in welding quality of ultrasonic welding machines in related technologies. Summary of the Invention

[0004] The present application provides an ultrasonic welding machine and a welding method to solve the problem of how to improve the consistency of the welding quality of the ultrasonic welding machine.

[0005] According to one aspect of the present application, an ultrasonic welding machine is provided, comprising a support member, a welding head, and a drive assembly. The support member is used to support a target part to be welded, and the support member is provided with a support surface for contacting the target part, and the support surface includes a welding reference surface. The welding head has a reference position contacting the welding reference surface, and the welding head also has a welding start position and a welding end position. The welding start position is offset by a first distance with respect to the reference position, and the welding end position is offset by a second distance with respect to the reference position, and the first distance is greater than the second distance. The drive assembly is connected to the welding head in a transmission manner and is used to drive the welding head to move from the welding start position to the welding end position.

[0006] The ultrasonic welding machine mentioned above, by setting the welding reference surface on the support member, eliminates the need for the welding start and end positions of the welding head during the welding process to be based on the surface of the target part, thereby eliminating the influence of the target part's deformation or dimensional deviation on the target part's surface position. This is conducive to improving the consistency of welding quality. That is, when replacing target parts of the same shape, the welding quality of different target parts of the same shape is more consistent, thereby improving the quality of the target parts. For target parts of different shapes, if the wall thickness of target parts of different shapes at the welding reference surface is different, then since the welding reference surface is set on the support member, it is free from the influence of the target part wall thickness change, thereby simplifying the debugging process when replacing target parts of different shapes and improving debugging efficiency.

[0007] In one embodiment, there are multiple welding reference surfaces, which are staggered on the support surface. There are multiple reference positions, welding start positions, and welding end positions, each corresponding to a welding reference surface. The welding head can be driven to move to different welding reference surface positions to weld target parts at different welding reference surfaces.

[0008] In one embodiment, the support surface is a curved surface, and at least two welding reference surfaces are not parallel to each other. The ultrasonic welding machine further includes a posture adjustment component connected to the driving component to drive the driving component and the welding head to change their postures.

[0009] In one embodiment, there are multiple welding heads, each of which can be driven to move to different welding reference plane positions to weld target parts at different welding reference planes. There are multiple drive assemblies, each of which corresponds to and is connected to the multiple welding heads.

[0010] In one embodiment, the end of the welding head close to the support member has an end surface. In the reference position, the end surface is tangent to the welding reference surface.

[0011] In one embodiment, the reference position, the welding start position, and the welding end position are respectively arranged at intervals along the welding depth direction. The driving assembly includes a moving part, which is connected to the welding head and can move together with the welding head along the welding depth direction. The ultrasonic welding machine also includes a limiting assembly; the limiting assembly includes a first limiting structure and a second limiting structure, and the first limiting structure and the second limiting structure are arranged at intervals along the welding depth direction. At the welding start position, the first limiting structure abuts against the side of the moving part away from the support member, and at the welding end position, the second limiting structure abuts against the side of the moving part close to the support member.

[0012] In one embodiment, the ultrasonic welding machine further includes a depth measuring device for measuring the displacement of the moving part along the welding depth direction.

[0013] In one embodiment, there are multiple support members, and the multiple support members are used to support different positions of the target part; the welding head can be driven to move to positions corresponding to different support members, and weld different positions of the target part based on the welding reference surfaces of different support members; and / or, the ultrasonic welding machine also includes a clamping assembly for pressing the target part onto the support member.

[0014] According to another aspect of the present application, a welding method is provided, based on the ultrasonic welding machine described in any of the above embodiments, the welding method comprising: positioning a welding head at a reference position; controlling a drive assembly to move the welding head from the reference position to a welding start position; placing a target object on a support member; and controlling the welding head to begin emitting ultrasonic waves; controlling the drive assembly to move the welding head from the welding start position to the welding end position, and controlling the welding head to stop emitting ultrasonic waves.

[0015] In one embodiment, there are multiple welding reference surfaces, and the multiple welding reference surfaces are staggered on the support surface; there are multiple reference positions, welding start positions, and welding end positions, and they correspond to the welding reference surfaces one by one; the welding head can be driven to move to different welding reference surface positions to weld target parts at different welding reference surfaces; the support surface is a curved surface, and at least two welding reference surfaces are not parallel to each other; the ultrasonic welding machine also includes a posture adjustment component, which is connected to the driving component to drive the driving component and the welding head to change their posture together; the end of the welding head close to the support member has an end face. Placing the welding head in the reference position includes: moving the welding head to one of the welding reference surface positions. Controlling the posture adjustment component to drive the driving component and the welding head to change their posture together so that the end face is tangent to the welding reference surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a three-dimensional diagram of an ultrasonic welding machine in one embodiment of the present application (the target part is additionally shown in the figure).

[0018] Figure 2 for Figure 1 A perspective view of the ultrasonic welding machine in the illustrated embodiment.

[0019] Figure 3 for Figure 2 A partial enlarged view of point C in the embodiment shown.

[0020] Figure 4 for Figure 1 Schematic diagram of the support member and welding head in the reference position in the illustrated embodiment.

[0021] Figure 5 for Figure 1 Schematic diagram of the target part, support part and welding head in the welding starting position in the embodiment shown.

[0022] Figure 6 for Figure 1 Schematic diagram of the target part, support part and welding head in the welding end position in the embodiment shown.

[0023] Figure 7 for Figure 1 Schematic diagram of the welding head and second target in the illustrated embodiment.

[0024] Figure 8 for Figure 1 Schematic diagram of the first target part and the second target part in the illustrated embodiment.

[0025] Figure 9 for Figure 1 Schematic diagram of a portion of the welding path of the welding head in the illustrated embodiment.

[0026] Figure 10 for Figure 1 Schematic diagram of the welding path of the welding head in the illustrated embodiment.

[0027] Figure 11 for Figure 1 Side view of the drive assembly in the illustrated embodiment.

[0028] Figure 12 for Figure 11 A partial schematic diagram of point B in the illustrated embodiment.

[0029] Figure 13 Flowchart of a welding method in one embodiment of the present application.

[0030] Description of main component symbols: Ultrasonic welding machine 100 Support member 10 Support surface 11 Welding reference surface 111 Welding head 20 End face 21 Drive assembly 30 Moving part 31 Posture adjustment component 40 Depth measuring device 50 Base 60 Compression assembly 70 Indenter 71 Limit component 80 The first limiting structure 81 The second limiting structure 82 Target 200 First target part 201 Second target part 202 Reference position W1 Welding starting position W2 Welding end position W3 First distance L1 Second distance L2 Welding depth direction A The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered therein. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered therein. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be an element centered therein. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the relevant listed items.

[0034] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0035] Example Figure 1 is a perspective view of an ultrasonic welding machine 100 in one embodiment of the present application (a target part 200 is additionally shown in the figure); Figure 2 for Figure 1 A perspective view of the ultrasonic welding machine 100 in the illustrated embodiment; Figure 3 for Figure 2 A partial enlarged view of point C in the embodiment shown; Figure 4 for Figure 1 A schematic diagram of the support member 10 and the welding head 20 in the illustrated embodiment in the reference position W1; Figure 5 for Figure 1 A schematic diagram of the target part 200, the support part 10 and the welding head 20 in the embodiment shown in the welding starting position W2; Figure 6 for Figure 1 Schematic diagram of the target part 200, the support part 10 and the welding head 20 at the welding end position W3 in the illustrated embodiment.

[0036] See also Figure 1 and Figure 2 This embodiment provides an ultrasonic welding machine 100, which includes a support member 10, a welding head 20, and a driving assembly 30. The support member 10 is used to support the target part 200 to be welded, and is combined with Figure 3 As shown, the support member 10 is provided with a support surface 11 for fitting with the target member 200, and the support surface 11 includes a welding reference surface 111. Figures 4 to 6 As shown, the welding head 20 has a reference position W1 in contact with the welding reference surface 111. The welding head 20 also has a welding start position W2 and a welding end position W3. The welding start position W2 is offset by a first distance L1 from the reference position W1, and the welding end position W3 is offset by a second distance L2 from the reference position W1. The first distance L1 is greater than the second distance L2. The drive assembly 30 is in driving connection with the welding head 20 and is configured to drive the welding head 20 from the welding start position W2 to the welding end position W3.

[0037] By positioning the welding reference surface 111 on the support member 10, the ultrasonic welding machine 100 eliminates the need for the welding start position W2 and welding end position W3 of the welding head 20 to be referenced to the surface of the target part 200 during the welding process. This eliminates the influence of deformation or dimensional deviation of the target part 200 on the surface position of the target part 200. This helps improve the consistency of welding quality. Specifically, when replacing target parts 200 of the same shape, the welding quality of different target parts 200 of the same shape is more consistent, thereby improving the quality of the target parts 200. For target parts 200 of different shapes, if the wall thickness of the target parts 200 at the welding reference surface 111 varies, the positioning of the welding reference surface 111 on the support member 10 eliminates the influence of the wall thickness variation of the target part 200. This simplifies the commissioning process when replacing target parts 200 of different shapes and improves commissioning efficiency. Optionally, the support member 10 is made of aluminum alloy, which is less prone to deformation, further ensuring the positional accuracy of the welding reference surface 111, thereby further improving the consistency of welding quality.

[0038] It should be noted that Figures 4 to 6 It is only used to illustrate the relative positions of the target part 200 , the support part 10 and the welding head 20 , and does not represent the specific structures of the target part 200 , the support part 10 and the welding head 20 .

[0039] Figure 7 for Figure 1 Schematic diagram of the welding head 20 and the second target 202 in the illustrated embodiment.

[0040] In some embodiments, the ultrasonic welding machine 100 further includes a controller (not shown). The controller is electrically connected to the drive assembly 30 and is configured to control the movement of the drive assembly 30 and the horn 20. The controller's program controls the drive assembly 30 based on the weld depth. Specifically, the displacement is calculated starting from the weld start position W2 and ending when the horn 20 reaches the weld end position W3. The displacement of the horn 20 from the weld start position W2 to the weld end position W3 is a preset weld depth D set by the program. This preset weld depth D is a fixed value. When debugging the controller program, the weld end position W3 is the debug value. When the tension and appearance of the weld meet the requirements, the weld end position W3 is fixed. It should be noted that a related art ultrasonic welding machine is provided in which the controller program controls the weld time. Specifically, the timer starts when the horn is at the weld start position and ends when the horn moves to the weld end position. The time it takes for the horn to move from the weld start position to the weld end position is the preset weld time. To ensure the weld depth is adequate, the ultrasonic welding machine in the related art emits ultrasonic waves for a longer period of time, resulting in a longer weld time. The ultrasonic welding machine 100 is controlled by welding depth, which helps to shorten welding time and improve welding efficiency.

[0041] In this embodiment, Figures 4 to 6 As shown, the target part 200 includes a first target part 201 and a second target part 202, and the welding head 20 is used to weld the first target part 201 to the second target part 202. During welding, the welding head 20 is first located at the reference position W1, and then the welding head 20 is offset by the first distance L1 based on the welding reference plane 111, and then the first target part 201 is placed on the support part 10, and the second target part 202 is placed on the first target part 201, and then the welding head 20 starts to emit ultrasonic waves and moves toward the welding reference plane 111 by a preset welding depth D, until the welding head 20 moves to the welding end position W3, and then the welding head 20 stops emitting ultrasonic waves, thereby completing the welding. Optionally, the reference position W1, the welding start position W2 and the welding end position W3 are respectively arranged at intervals along the welding depth direction A, and the preset welding depth D is equal to the difference between the first distance L1 and the second distance L2. Optionally, as Figure 5 As shown, the welding starting position W2 is located on the side of the second target part 202 away from the support part 10, and is spaced apart from the second target part 202 along the welding depth direction A, as shown in FIG. Figure 6 As shown, the welding termination position W3 is located in the first target part 201 .

[0042] Figure 8 for Figure 1 Schematic diagram of the first target part 201 and the second target part 202 in the illustrated embodiment.

[0043] Optionally, combined Figure 7 and Figure 8 As shown, the first target part 201 is, for example, a bumper, and the second target part 202 is, for example, a bumper bracket. In other embodiments, the first target part 201 and the second target part 202 can also be other parts that need to be welded together. It should be noted that Figure 8 The dotted line in the figure represents the welding path of the welding head 20, that is, the movement path of the welding head 20 during the welding process. For example, if there are two welding reference surfaces 111, the welding head 20 first emits ultrasonic waves from the first welding starting position W2 and moves to the first welding ending position W3 to complete the welding of the target part 200 at the first welding reference surface 111. Then, the welding head 20 moves from the first welding starting position W2 to the second welding starting position W2, emits ultrasonic waves again, and moves to the second welding ending position W3 to complete the welding of the target part 200 at the second welding reference surface 111.

[0044] Figure 9 for Figure 1 A schematic diagram of a portion of the welding path of the welding head 20 in the illustrated embodiment; Figure 10 for Figure 1 Schematic diagram of the welding path of the welding head 20 in the illustrated embodiment.

[0045] In some embodiments, as Figure 3 As shown, there are multiple welding reference surfaces 111, and the multiple welding reference surfaces 111 are staggered and distributed on the support surface 11. Figures 4 to 6 As shown, there are multiple reference positions W1, welding start positions W2 and welding end positions W3, and they correspond to the welding reference surface 111 one by one. Figure 9 and Figure 10 As shown, the welding head 20 can be driven to move to different welding reference surfaces 111 to weld the target part 200 at different welding reference surfaces 111. In this way, different positions of the target part 200 can be welded respectively by the welding head 20, and since the corresponding welding reference surface 111 is used as a reference for each welding, the consistency of the welding quality when the welding head 20 welds different positions of the target part 200 is improved. Optionally, the welding head 20 can be driven to move to different welding reference surfaces 111 by a robot. During welding, as shown in FIG. Figure 9 As shown, the welding head 20 can perform welding in sequence along the approximate arrangement direction of the multiple welding reference surfaces 111 to shorten the welding path.

[0046] In some embodiments, as Figure 3 As shown, the support surface 11 is a curved surface, and at least two welding reference surfaces 111 are not parallel to each other. Figure 2As shown, the ultrasonic welding machine 100 also includes a posture adjustment component 40, and the posture adjustment component 40 is connected to the driving component 30 to drive the driving component 30 and the welding head 20 to change their postures together. It should be noted that the support surface 11 is adapted to the shape of the target part 200 to provide more stable support. Therefore, by setting the support surface 11 as a curved surface, it is suitable for the target part 200 with a curved surface. By setting the posture adjustment component 40, it is convenient to change the posture of the welding head 20, so as to facilitate the welding head 20 to be attached to different welding reference surfaces 111 respectively. Optionally, the posture adjustment component 40 can be a manipulator. Before welding begins, the welding head 20 can be moved to the position of the welding reference surface 111 by the manipulator, and then the posture of the welding head 20 can be changed by the manipulator to adjust the welding head 20 to the reference position W1 (see Figure 4 ).

[0047] In other embodiments, the support surface 11 is planar to match the shape of the target part 200 having a planar surface.

[0048] In some embodiments, the preset welding depths D corresponding to the multiple welding reference surfaces 111 are equal. The controller solidifies the program from the welding start position W2 to the welding end position W3 as a subroutine in the welding process. In this way, program debugging is simplified, and offline programming can be achieved, thereby improving debugging efficiency. When in use, welding of multiple positions of the same target part 200 can adopt a subroutine calling mode. When the position or posture of the welding head 20 at different welding reference surfaces 111 needs to be fine-tuned, the preset welding depth D is ensured to remain unchanged, and the posture adjustment component 40 is adjusted so as not to affect the subroutine, thereby enabling rapid debugging and ensuring the consistency of the welding depths at different welding reference surfaces 111.

[0049] In some embodiments, as Figure 2 As shown, there are multiple welding heads 20, and the multiple welding heads 20 can be driven to move to different welding reference surfaces 111 (see Figure 3 ) positions to weld the target part 200 at different locations on the welding reference surface 111. Multiple drive assemblies 30 are provided, each corresponding to and connected to the multiple welding heads 20. This allows welding at different locations on the target part 200 using the multiple welding heads 20, improving welding efficiency. In this embodiment, there are two welding heads 20 and two drive assemblies 30.

[0050] In some embodiments, as Figure 7 As shown, the end of the welding head 20 close to the support 10 has an end surface 21, Figure 4 As shown, at the reference position W1, the end face 21 and the welding reference surface 111 (see Figure 3) are tangent to improve the accuracy of the reference position W1. Optionally, the end face 21 is a plane and the welding reference surface 111 is a curved surface. In the process of adjusting the welding head 20 to the reference position W1, the welding head 20 can be first moved to the position of the welding reference surface 111 and the welding head 20 can be brought into contact with the welding reference surface 111. Then, the posture of the welding head 20 is adjusted so that the distance between the outer edge of the welding head 20 and the welding reference surface 111 is less than a preset distance, for example, 0.1 mm, and the position of the welding head 20 at this time is set as the reference position W1. For example, the end face 21 is constructed in a rectangular shape. During adjustment, the operator can insert a feeler gauge between the four corners of the welding head 20 and the welding reference surface 111 respectively. When the distance between the four corners of the welding head 20 and the welding reference surface 111 is less than the preset distance, the position of the welding head 20 at this time is set as the reference position W1.

[0051] Figure 11 for Figure 1 a side view of the drive assembly 30 in the illustrated embodiment; Figure 12 for Figure 11 A partial schematic diagram of point B in the illustrated embodiment.

[0052] In some embodiments, as Figures 4 to 6 As shown, the reference position W1, the welding start position W2 and the welding end position W3 are respectively arranged at intervals along the welding depth direction A. Figure 11 and Figure 12 As shown, the driving assembly 30 (such as a cylinder) includes a moving part 31, which is connected to the welding head 20 and can move together with the welding head 20 along the welding depth direction A. The ultrasonic welding machine 100 also includes a limiting assembly 80, which includes a first limiting structure 81 and a second limiting structure 82. The first limiting structure 81 and the second limiting structure 82 are arranged at intervals along the welding depth direction A. At the welding starting position W2, the first limiting structure 81 abuts against the side of the moving part 31 away from the support member 10, and at the welding ending position W3, the second limiting structure 82 abuts against the side of the moving part 31 close to the support member 10. In this way, the movement of the moving part 31 and the welding head 20 is limited by the first limiting structure 81 and the second limiting structure 82 to ensure that the welding head 20 moves to the preset welding depth D, thereby improving the consistency of the welding depth.

[0053] In some embodiments, as Figure 12 As shown, the ultrasonic welding machine 100 further includes a depth measuring device 50 for measuring the displacement of the moving member 31 along the welding depth direction A. Thus, it is possible to verify whether the displacement measured by the depth measuring device 50 is equal to a preset welding depth D. Optionally, the depth measuring device 50 measures the displacement of the moving member 31 along the welding depth direction A using infrared rays.

[0054] In some embodiments, as Figure 2As shown, there are multiple support members 10, and the multiple support members 10 are used to support different positions of the target part 200. The welding head 20 can be driven to move to the position corresponding to different support members 10 to pass through the welding reference surface 111 (see Figure 3 ) as a reference for welding at different locations on the target part 200. By providing multiple support members 10, the support stability of the target part 200 is improved, and the ultrasonic welding machine 100 is suitable for larger target parts 200. In this embodiment, there are three support members 10, which are spaced apart along the width of the target part 200.

[0055] In some embodiments, as Figure 2 As shown, the ultrasonic welding machine 100 further includes a base 60 , and a plurality of support members 10 are respectively disposed on the base 60 .

[0056] In some embodiments, as Figure 3 As shown, the ultrasonic welding machine 100 further includes a pressing assembly 70 for pressing the target part 200 onto the support part 10 so that the target part 200 (see FIG. Figure 2 ) is fixed relative to the support member 10. Optionally, the pressing assembly 70 includes a plurality of pressing heads 71, and the plurality of pressing heads 71 ​​correspond to the plurality of welding reference surfaces 111 one by one.

[0057] Figure 13 Flowchart of a welding method in one embodiment of the present application.

[0058] See also Figure 13 According to another aspect of the present application, a welding method is provided. Based on the ultrasonic welding machine 100 described in any of the above embodiments, the welding method includes: S110 : Position the welding head 20 at the reference position W1 .

[0059] S120 : Control the driving assembly 30 to drive the welding head 20 to move from the reference position W1 to the welding starting position W2 , place the target part 200 on the support part 10 , and control the welding head 20 to start emitting ultrasonic waves.

[0060] S130: Control the driving assembly 30 to drive the welding head 20 to move from the welding starting position W2 to the welding ending position W3, and control the welding head 20 to stop emitting ultrasonic waves.

[0061] The above-mentioned welding method, since the welding starting position W2 and the welding ending position W3 of the welding head 20 during the welding process do not need to be based on the surface of the target part 200, thus getting rid of the influence of the surface position of the target part 200 caused by the deformation or dimensional deviation of the target part 200, is conducive to improving the consistency of welding quality.

[0062] In some embodiments, S110 includes: S110 : Move the welding head 20 to the position of one of the welding reference surfaces 111 .

[0063] S120 : Control the posture adjustment component 40 to drive the driving component 30 and the welding head 20 to change their postures, so that the end face 21 is tangent to the welding reference surface 111 .

[0064] In this way, the posture of the welding head 20 can be easily changed, so that the welding head 20 can be easily attached to different welding reference surfaces 111 to reach the corresponding reference position W1.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. An ultrasonic welding machine, characterized in that: include: A support member, used to support a target member to be welded, wherein the support member is provided with a support surface for fitting with the target member, and the support surface includes a welding reference surface; a welding head having a reference position abutting the welding reference surface, the welding head further having a welding start position and a welding end position, the welding start position being offset by a first distance relative to the reference position, the welding end position being offset by a second distance relative to the reference position, the first distance being greater than the second distance; as well as, A driving assembly is connected to the welding head in a transmission manner and is used to drive the welding head to move from the welding starting position to the welding ending position.

2. The ultrasonic welding machine according to claim 1, characterized in that: There are multiple welding reference surfaces, and the multiple welding reference surfaces are staggered and distributed on the support surface; There are multiple reference positions, welding start positions and welding end positions, respectively, and they correspond one-to-one to the welding reference planes respectively; The welding head can be driven to move to different welding reference plane positions to weld the target parts at different welding reference planes.

3. The ultrasonic welding machine according to claim 1, characterized in that: The support surface is a curved surface, and at least two of the welding reference surfaces are not parallel to each other; The ultrasonic welding machine further includes a posture adjustment component, which is connected to the driving component to drive the driving component and the welding head to change their postures together.

4. The ultrasonic welding machine according to claim 1, characterized in that: There are multiple welding heads, and the multiple welding heads can be driven to move to different positions of the welding reference planes respectively to weld the target parts at different welding reference planes respectively; There are multiple driving components, and the multiple driving components correspond to and are connected to the multiple welding heads one by one.

5. The ultrasonic welding machine according to claim 1, characterized in that: The welding head has an end surface at one end close to the support member; At the reference position, the end face is tangent to the welding reference plane.

6. The ultrasonic welding machine according to claim 1, characterized in that: The reference position, the welding start position and the welding end position are respectively arranged at intervals along the welding depth direction; The driving assembly includes a moving part, which is connected to the welding head and can move together with the welding head along the welding depth direction; The ultrasonic welding machine further includes a limiting assembly; the limiting assembly includes a first limiting structure and a second limiting structure, the first limiting structure and the second limiting structure are spaced apart along the welding depth direction; At the welding starting position, the first limiting structure abuts against a side of the moving member away from the supporting member, and at the welding ending position, the second limiting structure abuts against a side of the moving member close to the supporting member.

7. The ultrasonic welding machine according to claim 6, characterized in that: The ultrasonic welding machine further comprises a depth measuring device for measuring the displacement of the moving part along the welding depth direction.

8. The ultrasonic welding machine according to claim 1, characterized in that: There are multiple support members, and the multiple support members are used to support different positions of the target part; the welding head can be driven to move to positions corresponding to different support members, and weld different positions of the target part based on the welding reference surfaces of different support members; and / or, The ultrasonic welding machine further includes a pressing assembly for pressing the target part onto the supporting part.

9. A welding method, characterized in that: Based on the ultrasonic welding machine according to any one of claims 1 to 8, the welding method includes: Positioning the welding head at the reference position; Controlling the driving assembly to drive the welding head to move from the reference position to the welding starting position, placing the target part on the support member, and controlling the welding head to start emitting ultrasonic waves; The driving assembly is controlled to drive the welding head to move from the welding starting position to the welding ending position, and the welding head is controlled to stop emitting ultrasonic waves.

10. The welding method according to claim 9, wherein: There are multiple welding reference surfaces, and the multiple welding reference surfaces are staggered on the support surface; there are multiple reference positions, welding start positions, and welding end positions, and they correspond to the welding reference surfaces one by one; the welding head can be driven to move to different welding reference surface positions to weld the target parts at different welding reference surfaces; the support surface is a curved surface, and at least two of the welding reference surfaces are not parallel to each other; the ultrasonic welding machine also includes a posture adjustment component, which is connected to the driving component to drive the driving component and the welding head to change their posture together; The welding head has an end surface at one end close to the support member; The positioning of the welding head at the reference position comprises: Moving the welding head to one of the welding reference surface positions; The posture adjustment component is controlled to drive the driving component and the welding head to change their postures, so that the end face is tangent to the welding reference surface.

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