Connection structure and connection method

Abstract

The present invention discloses a connection structure and a connection method, wherein the connection structure comprises a first workpiece, a second workpiece and a universal joint, wherein a first ball head and a second ball head are respectively arranged at two ends of the universal joint, and the first ball head of the universal joint is inserted into a first positioning groove of the first workpiece, and the second ball head is inserted into a second positioning groove of the second workpiece, so that the first workpiece and the second workpiece can be preliminarily positioned, and the first workpiece and the second workpiece can still move relatively, and after accurately adjusting the relative positions of the two, the first ball head can be welded to the inner wall of the first positioning groove, and the second ball head can be welded to the inner wall of the second positioning groove, and then the first connecting surface of the first workpiece and the second connecting surface of the second workpiece are glued, so that micro-deformation after gluing can be reduced and the connection accuracy can be improved. The connection method combining welding and gluing can improve the connection strength between the first workpiece and the second workpiece, thereby improving the yield rate.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece connection, and in particular to a connection structure and a connection method. Background Art

[0002] When two workpieces are connected to each other by gluing, due to the properties of the glue itself, micro-deformation usually occurs at the gluing position. In related technologies, pre-deformation is required in advance to ensure the connection accuracy of the gluing, but the pre-deformation data is difficult to calculate. After the two workpieces are glued, warping and deformation are still prone to occur, resulting in a low yield rate and low connection strength of the glue. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a connection structure that can reduce micro-deformation after bonding, improve connection accuracy and connection strength, and improve yield rate.

[0004] The invention also proposes a connection method applied to the above connection structure.

[0005] A connection structure provided by an embodiment of the first aspect of the present invention includes a first workpiece, a second workpiece and a universal joint, the first workpiece having a first connection surface, the first connection surface being provided with a plurality of first positioning grooves; the second workpiece having a second connection surface, the second connection surface being provided with a plurality of second positioning grooves; the universal joint includes a first ball head, a second ball head and a connecting rod, the first ball head and the second ball head being respectively connected to the two ends of the connecting rod, the first ball head being accommodated in the interior of the first positioning groove and welded to the groove wall of the first positioning groove, the second ball head being accommodated in the interior of the second positioning groove and welded to the groove wall of the second positioning groove; wherein, there is a gap between the first connection surface and the second connection surface, and the first connection surface and the second connection surface are glued together.

[0006] The connection structure provided by the embodiment of the first aspect of the present invention has at least the following beneficial effects: a first ball head and a second ball head are respectively provided at both ends of the universal joint, and the first ball head of the universal joint is inserted into the first positioning groove of the first workpiece, and the second ball head is inserted into the second positioning groove of the second workpiece, so that the first workpiece and the second workpiece can be preliminarily positioned, and the first workpiece and the second workpiece can still move relative to each other. After accurately adjusting the relative positions of the two, the first ball head can be welded to the inner wall of the first positioning groove, and the second ball head can be welded to the inner wall of the second positioning groove, and then the first connecting surface of the first workpiece and the second connecting surface of the second workpiece are glued, which can reduce micro-deformation after gluing and improve connection accuracy. The connection method combining welding and gluing can improve the connection strength between the first workpiece and the second workpiece, thereby improving the yield rate.

[0007] In some embodiments of the present invention, the connection structure further includes a plurality of springs, and the springs are connected to the bottom of the first positioning groove or the second positioning groove.

[0008] In some embodiments of the present invention, a recessed portion is disposed on the first connection surface, and a raised portion is disposed on the second connection surface. The raised portion is plugged into the recessed portion, and a gap is formed between the raised portion and the recessed portion.

[0009] In some embodiments of the present invention, the cross-sections of the first positioning groove and the second positioning groove are both circular, the first ball head contacts the side wall of the first positioning groove in the circumferential direction, and the second ball head contacts the side wall of the second positioning groove in the circumferential direction.

[0010] A connection method provided by an embodiment of a second aspect of the present invention is used to connect a first workpiece and a second workpiece, wherein the first workpiece has a first connection surface, the first connection surface is provided with a plurality of first positioning grooves, and the second workpiece has a second connection surface, the second connection surface is provided with a plurality of second positioning grooves, and comprises the steps of:

[0011] Prepare a universal joint, the universal joint comprising a first ball head, a second ball head and a connecting rod, the first ball head and the second ball head are respectively connected to two ends of the connecting rod;

[0012] Insert the first ball head into the first positioning groove, and insert the second ball head into the second positioning groove;

[0013] Adjusting the relative position of the first workpiece and the second workpiece until the first workpiece and the second workpiece reach a preset docking accuracy;

[0014] Welding the first ball head to the inner wall of the first positioning groove, and welding the second ball head to the inner wall of the second positioning groove;

[0015] The first connection surface and the second connection surface are bonded together.

[0016] The connection method provided by the embodiment of the second aspect of the present invention has at least the following beneficial effects: a first ball head and a second ball head are respectively provided at both ends of the universal joint, and the first ball head of the universal joint is inserted into the first positioning groove of the first workpiece, and the second ball head is inserted into the second positioning groove of the second workpiece, so that the first workpiece and the second workpiece can be preliminarily positioned, and the first workpiece and the second workpiece can still move relative to each other. After accurately adjusting the relative positions of the two, the first ball head is welded to the inner wall of the first positioning groove, and the second ball head is welded to the inner wall of the second positioning groove, and then the first connecting surface of the first workpiece and the second connecting surface of the second workpiece are glued, which can reduce micro-deformation after gluing and improve connection accuracy. The connection method combining welding and gluing can improve the connection strength between the first workpiece and the second workpiece, thereby improving the yield rate.

[0017] In some embodiments of the present invention, the step of adjusting the positions of the first workpiece and the second workpiece includes:

[0018] Adjusting the relative position of the first workpiece and the second workpiece in the X direction;

[0019] Adjusting the relative position of the first workpiece and the second workpiece in the Y direction;

[0020] The X direction and the Y direction are perpendicular to each other, and at least one of the first connecting surface and the second connecting surface is parallel to the XY plane.

[0021] In some embodiments of the present invention, the step of adjusting the positions of the first workpiece and the second workpiece further comprises:

[0022] Adjusting the relative position of the first workpiece and the second workpiece in the Z direction;

[0023] The Z direction is perpendicular to the X direction and the Y direction.

[0024] In some embodiments of the present invention, a numerically controlled positioner is used to adjust the relative position of the first workpiece and the second workpiece.

[0025] In some embodiments of the present invention, the step of welding the first ball head and the second ball head comprises:

[0026] Spot welding the tangent points between the first ball head and the inner wall of the first positioning groove;

[0027] Spot welding is performed on the tangent point between the second ball head and the inner wall of the second positioning groove.

[0028] In some embodiments of the present invention, laser welding is used to spot weld the tangent points between the first ball head and the inner wall of the first positioning groove and the tangent points between the second ball head and the inner wall of the second positioning groove.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 A three-dimensional perspective schematic diagram of the connection structure of some embodiments provided in the first aspect of the present invention;

[0032] Figure 2 for Figure 1 A front view of the connection structure shown;

[0033] Figure 3 for Figure 2 A cross-sectional view of section AA is shown;

[0034] Figure 4 for Figure 2 A cross-sectional view of section BB is shown;

[0035] Figure 5 for Figure 1 An exploded schematic diagram of the connection structure shown;

[0036] Figure 6 for Figure 1 An exploded schematic diagram of the connection structure shown in another angle;

[0037] Figure 7 A flow chart of a connection method for some embodiments provided in the second aspect of the present invention;

[0038] Figure 8 for Figure 7 The flowchart of step S300 is shown;

[0039] Fig. 9 for Figure 7 The flowchart of step S400 is shown.

[0040] Reference numerals:

[0041] The first workpiece 100 , the first connecting surface 110 , the first positioning groove 111 , the recessed portion 112 , the second workpiece 200 , the second connecting surface 210 , the second positioning groove 211 , the raised portion 212 , the universal joint 300 , the first ball head 310 , the second ball head 320 , the connecting rod 330 , and the spring 400 . DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, left, right, etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0045] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The connection structure provided by the embodiment of the first aspect of the present invention includes a first workpiece 100, a second workpiece 200 and a universal joint 300, wherein the first workpiece 100 has a first connection surface 110, and the first connection surface 110 is provided with a plurality of first positioning grooves 111; the second workpiece 200 has a second connection surface 210, and the second connection surface 210 is provided with a plurality of second positioning grooves 211; the universal joint 300 includes a first ball head 310, a second ball head 320 and a connecting rod 330, wherein the first ball head 310 and the second ball head 320 are respectively connected to the two ends of the connecting rod 330, the first ball head 310 is accommodated in the interior of the first positioning groove 111 and welded to the groove wall of the first positioning groove 111, and the second ball head 320 is accommodated in the interior of the second positioning groove 211 and welded to the groove wall of the second positioning groove 211; wherein, there is a gap between the first connection surface 110 and the second connection surface 210, and the first connection surface 110 and the second connection surface 210 are glued.

[0047] For example, Figure 1 As shown, the connection structure includes a first workpiece 100, a second workpiece 200 and a universal joint 300. Figures 2 to 6The first workpiece 100 has a first connecting surface 110, and the first connecting surface 110 is provided with a plurality of first positioning grooves 111; the second workpiece 200 has a second connecting surface 210, and the second connecting surface 210 is provided with a plurality of second positioning grooves 211; the universal joint 300 includes a first ball head 310, a second ball head 320 and a connecting rod 330, the first ball head 310 and the second ball head 320 are respectively connected to the two ends of the connecting rod 330, the first ball head 310 is accommodated in the first positioning groove 111 and welded to the groove wall of the first positioning groove 111, and the second ball head 320 is accommodated in the second positioning groove 211 and welded to the groove wall of the second positioning groove 211; wherein, there is a gap between the first connecting surface 110 and the second connecting surface 210, and the first connecting surface 110 and the second connecting surface 210 are glued. The first ball head 310 and the second ball head 320 are respectively provided at both ends of the universal joint 300. The first ball head 310 of the universal joint 300 is inserted into the first positioning groove 111 of the first workpiece 100, and the second ball head 320 is inserted into the second positioning groove 211 of the second workpiece 200. The first workpiece 100 and the second workpiece 200 can be initially positioned, and the first workpiece 100 and the second workpiece 200 can still move relative to each other. After accurately adjusting the relative positions of the two, the first ball head 310 can be welded to the inner wall of the first positioning groove 111, and the second ball head 320 can be welded to the inner wall of the first positioning groove 111. The inner wall of the second positioning groove 211, and then the first connecting surface 110 of the first workpiece 100 and the second connecting surface 210 of the second workpiece 200 are glued, which can reduce the micro deformation after gluing and improve the connection accuracy; the connection method combining welding and gluing can improve the connection strength between the first workpiece 100 and the second workpiece 200; in addition, when the first connecting surface 110 and the second connecting surface 210 are glued, the glue can partially penetrate into the first positioning groove 111 and the second positioning groove 211, thereby increasing the bonding area, further improving the connection strength, and improving the yield rate.

[0048] It is understandable that the number of the first positioning groove 111 and the second positioning groove 211 is not limited and can be set according to actual needs. Figure 5 and Figure 6 For the first workpiece 100 and the second workpiece 200 with rectangular cross sections, four first positioning grooves 111 may be opened at the four corners of the first connecting surface 110 , and four second positioning grooves 211 may be opened at the four corners of the second connecting surface 210 .

[0049] In some embodiments of the present invention, the connection structure further includes a plurality of springs 400 , and the springs 400 are connected to the bottom of the first positioning groove 111 or the second positioning groove 211 .

[0050] For example, Figure 1 As shown, the connection structure also includes a plurality of springs 400, referring to Figure 4, the spring 400 is connected to the bottom of the first positioning groove 111, the second ball head 320 is abutted against the bottom of the second positioning groove 211, and the first ball head 310 is abutted against the spring 400. The first workpiece 100 and the second workpiece 200 can be relatively close to or away from each other while ensuring the stability of the position of the universal joint 300, thereby adjusting the size of the gap between the first workpiece 100 and the second workpiece 200; and, in the case where the opening positions of the first positioning groove 111 and the second positioning groove 211 have a certain error, the universal joint 300 may have a certain inclination angle, and the inclination angles of each universal joint 300 are different. The spring 400 can ensure that when the inclination angles of multiple universal joints 300 are different, the first workpiece 100 and the second workpiece 200 can still be aligned, and the position of the universal joint 300 can be ensured to be stable, thereby further improving the connection accuracy.

[0051] It is understandable that the spring 400 may also be connected to the bottom of the second positioning groove 211 .

[0052] In some embodiments of the present invention, a recessed portion 112 is disposed on the first connection surface 110 , and a raised portion 212 is disposed on the second connection surface 210 . The raised portion 212 is inserted into the recessed portion 112 , and a gap is formed between the raised portion 212 and the recessed portion 112 .

[0053] For example, Figure 5 As shown, a recessed portion 112 is provided on the first connecting surface 110. Figure 6 As shown, a protrusion 212 is provided on the second connection surface 210, referring to Figure 1 and Figure 3 The raised portion 212 is inserted into the recessed portion 112, and there is a gap between the raised portion 212 and the recessed portion 112. The raised portion 212 and the recessed portion 112 can play a certain guiding role in the initial positioning of the first workpiece 100 and the second workpiece 200, and the gap between the raised portion 212 and the recessed portion 112 can provide a moving space for the subsequent adjustment of the relative position of the first workpiece 100 and the second workpiece 200.

[0054] It is understandable that the size, shape, etc. of the protrusion 212 and the recessed portion 112 are not limited and can be set according to actual needs.

[0055] In some embodiments of the present invention, the cross-sections of the first positioning groove 111 and the second positioning groove 211 are both circular, the first ball head 310 circumferentially contacts the side wall of the first positioning groove 111 , and the second ball head 320 circumferentially contacts the side wall of the second positioning groove 211 .

[0056] For example, Figures 5 and 6 As shown, the first positioning groove 111 and the second positioning groove 211 are both circular grooves. Figure 4The first ball head 310 contacts the side wall of the first positioning groove 111 in the circumferential direction, and the second ball head 320 contacts the side wall of the second positioning groove 211 in the circumferential direction. The contact range between the first ball head 310 and the side wall of the first positioning groove 111, and the contact range between the second ball head 320 and the side wall of the second positioning groove 211 is relatively large, and more welding points can be set, which can improve the stability of the connection.

[0057] The second aspect of the present invention provides a connection method for connecting a first workpiece 100 and a second workpiece 200, wherein the first workpiece 100 has a first connection surface 110, and the first connection surface 110 is provided with a plurality of first positioning grooves 111, and the second workpiece 200 has a second connection surface 210, and the second connection surface 210 is provided with a plurality of second positioning grooves 211, comprising the steps of:

[0058] S100, preparing a universal joint 300, the universal joint 300 comprising a first ball head 310, a second ball head 320 and a connecting rod 330, the first ball head 310 and the second ball head 320 being connected to two ends of the connecting rod 330 respectively;

[0059] S200, inserting the first ball head 310 into the first positioning groove 111, and inserting the second ball head 320 into the second positioning groove 211;

[0060] S300, adjusting the relative position of the first workpiece 100 and the second workpiece 200 until the first workpiece 100 and the second workpiece 200 reach a preset docking accuracy;

[0061] S400, welding the first ball head 310 to the inner wall of the first positioning groove 111, and welding the second ball head 320 to the inner wall of the second positioning groove 211;

[0062] S500 , bonding the first connection surface 110 and the second connection surface 210 .

[0063] For example, Figure 7As shown, firstly, step S100 is performed to prepare the universal joint 300, and then step S200 is performed to insert the first ball head 310 into the first positioning groove 111, and the second ball head 320 into the second positioning groove 211. At this time, the first workpiece 100 and the second workpiece 200 are preliminarily connected, and the first ball head 310 can rotate in the first positioning groove 111, and the second ball head 320 can rotate in the second positioning groove 211. Step S300 is performed to adjust the relative position of the first workpiece 100 and the second workpiece 200 until the first workpiece 100 and the second workpiece 200 reach a preset docking accuracy, and then step S400 is performed to weld the first ball head 310 to the inner wall of the first positioning groove 111, and weld the second ball head 320 to the second positioning groove 211. The inner wall of the first workpiece 100 is formed to fix the relative position of the second workpiece 200, and then step S500 is performed to glue the first connecting surface 110 and the second connecting surface 210. Since the first workpiece 100, the universal joint 300, and the second workpiece 200 are connected to each other in the form of welding, after gluing, the micro-deformation generated between the first workpiece 100 and the second workpiece 200 is small, which can improve the connection accuracy; the connection method combining welding and gluing can improve the connection strength between the first workpiece 100 and the second workpiece 200; in addition, when the first connecting surface 110 and the second connecting surface 210 are glued, the glue can partially penetrate into the first positioning groove 111 and the second positioning groove 211, thereby increasing the bonding area, further improving the connection strength, and improving the yield rate.

[0064] It is understandable that the preset docking accuracy between the first workpiece 100 and the second workpiece 200 can be set according to actual needs.

[0065] In some embodiments of the present invention, the step of adjusting the positions of the first workpiece 100 and the second workpiece 200 includes:

[0066] S310, adjusting the relative position of the first workpiece 100 and the second workpiece 200 in the X direction;

[0067] S320, adjusting the relative position of the first workpiece 100 and the second workpiece 200 in the Y direction;

[0068] The X direction and the Y direction are perpendicular to each other, and at least one of the first connection surface 110 and the second connection surface 210 is parallel to the XY plane.

[0069] For example, Figure 8 As shown, step S300 includes steps S310 and S320, referring to Figure 1After performing step S200, the first ball head 310 can rotate in the first positioning groove 111, and the second ball head 320 can rotate in the second positioning groove 211. Therefore, by performing step S310 to adjust the relative position of the first workpiece 100 and the second workpiece 200 in the X direction, and performing step S320 to adjust the relative position of the first workpiece 100 and the second workpiece 200 in the Y direction, it is possible to ensure that the first workpiece 100 and the second workpiece 200 are accurately docked in the X direction and the Y direction, thereby improving the connection accuracy.

[0070] In some embodiments of the present invention, the step of adjusting the positions of the first workpiece 100 and the second workpiece 200 further includes:

[0071] S330, adjusting the relative position of the first workpiece 100 and the second workpiece 200 in the Z direction;

[0072] The Z direction is perpendicular to the X direction and the Y direction.

[0073] For example, Figure 8 As shown, step S300 also includes step S330, referring to Figure 1 Step S330 is performed to adjust the relative position of the first workpiece 100 and the second workpiece 200 in the Z direction, and the size of the gap between the first workpiece 100 and the second workpiece 200 can be adjusted, so as to ensure that the first workpiece 100 and the second workpiece 200 are accurately docked while ensuring that the subsequent steps S400 and S500 have sufficient operating space.

[0074] It is understandable that, referring to Figure 4 A plurality of springs 400 may be provided to be connected to the bottom of the first positioning groove 111, the second ball head 320 may be abutted against the bottom of the second positioning groove 211, the first ball head 310 may abut against the spring 400, and the first workpiece 100 and the second workpiece 200 may be relatively close to or far away from each other while ensuring the stability of the position of the universal joint 300, thereby adjusting the size of the gap between the first workpiece 100 and the second workpiece 200 and further improving the connection accuracy.

[0075] It is understandable that there is no restriction on the order of the above steps S310, S320, and S330, and they can be performed sequentially or simultaneously according to actual needs.

[0076] In some embodiments of the present invention, a numerical control positioner is used to adjust the relative position of the first workpiece 100 and the second workpiece 200. The numerical control positioner works reliably and has high positioning accuracy.

[0077] In some embodiments of the present invention, the welding step of the first ball head 310 and the second ball head 320 includes:

[0078] S410, spot welding the tangent point between the first ball head 310 and the inner wall of the first positioning groove 111;

[0079] S420 , spot welding is performed on the tangent point between the second ball head 320 and the inner wall of the second positioning groove 211 .

[0080] For example, Fig. 9 As shown, step S400 includes steps S410 and S420. After the first workpiece 100 and the second workpiece 200 are precisely positioned through step S300, the tangent points between the first ball head 310 and the inner wall of the first positioning groove 111 are spot welded, and the tangent points between the second ball head 320 and the inner wall of the second positioning groove 211 are spot welded. This can quickly fix the first workpiece 100, the universal joint 300 and the second workpiece 200, thereby improving production efficiency.

[0081] It is understandable that there is no restriction on the order of steps S410 and S420, and they can be performed sequentially or simultaneously according to actual needs.

[0082] In some embodiments of the present invention, laser welding is used to spot weld the tangent points between the first ball head 310 and the inner wall of the first positioning groove 111, and the tangent points between the second ball head 320 and the inner wall of the second positioning groove 211. Laser welding has a high speed, a large depth, and a small deformation, which can further reduce deformation, improve connection strength, and thus improve the yield rate.

[0083] It should be noted that the connection structure and connection method provided by the present invention are applicable to two workpieces having connecting surfaces. The connecting surfaces of the two workpieces must have an area where positioning grooves can be opened, and the positions of the positioning grooves of the two connecting surfaces can correspond to each other so that the two workpieces can be docked by inserting a universal joint.

[0084] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A connection structure, characterized in that: include: A first workpiece having a first connecting surface, wherein the first connecting surface is provided with a plurality of first positioning grooves; A second workpiece has a second connecting surface, wherein the second connecting surface is provided with a plurality of second positioning grooves; A universal joint, comprising a first ball head, a second ball head and a connecting rod, wherein the first ball head and the second ball head are respectively connected to two ends of the connecting rod, the first ball head is accommodated in the first positioning groove and welded to the groove wall of the first positioning groove, and the second ball head is accommodated in the second positioning groove and welded to the groove wall of the second positioning groove; A plurality of springs, wherein the springs are connected to the bottom of the first positioning groove or the second positioning groove; The first connecting surface is provided with a recessed portion, the second connecting surface is provided with a raised portion, the raised portion is plugged into the recessed portion, and a gap is formed between the raised portion and the recessed portion; There is a gap between the first connection surface and the second connection surface, and the first connection surface and the second connection surface are glued together; The first positioning grooves are respectively formed at the four end corners of the first connecting surface, so that the first connecting surface has four first positioning grooves; The second positioning grooves are respectively formed at the four end corners of the second connecting surface, so that the second connecting surface has four second positioning grooves; The universal joints are arranged between the four first positioning grooves and the four second positioning grooves.

2. The connection structure according to claim 1, characterized in that: The cross sections of the first positioning groove and the second positioning groove are both circular, the first ball head contacts the side wall of the first positioning groove in the circumferential direction, and the second ball head contacts the side wall of the second positioning groove in the circumferential direction.

3. A connection method for connecting a first workpiece and a second workpiece, wherein the first workpiece has a first connection surface, the first connection surface is provided with a plurality of first positioning grooves, the first connection surface is provided with a recessed portion, and the second workpiece has a second connection surface, the second connection surface is provided with a plurality of second positioning grooves, the second connection surface is provided with a protruding portion, characterized in that: Includes steps: Prepare a universal joint, the universal joint comprising a first ball head, a second ball head and a connecting rod, the first ball head and the second ball head are respectively connected to two ends of the connecting rod; Insert the first ball head into the first positioning groove, and insert the second ball head into the second positioning groove; Inserting the protrusion into the recess, with a gap between the protrusion and the recess; Adjusting the relative position of the first workpiece and the second workpiece until the first workpiece and the second workpiece reach a preset docking accuracy; Welding the first ball head to the inner wall of the first positioning groove, and welding the second ball head to the inner wall of the second positioning groove; The first connection surface and the second connection surface are bonded together.

4. The connection method according to claim 3, characterized in that: The step of adjusting the positions of the first workpiece and the second workpiece comprises: Adjusting the relative position of the first workpiece and the second workpiece in the X direction; Adjusting the relative position of the first workpiece and the second workpiece in the Y direction; The X direction and the Y direction are perpendicular to each other, and at least one of the first connecting surface and the second connecting surface is parallel to the XY plane.

5. The connection method according to claim 4, characterized in that: The step of adjusting the positions of the first workpiece and the second workpiece further comprises: Adjusting the relative position of the first workpiece and the second workpiece in the Z direction; The Z direction is perpendicular to the X direction and the Y direction.

6. The connection method according to any one of claims 3 to 5, characterized in that: A numerically controlled positioner is used to adjust the relative position of the first workpiece and the second workpiece.

7. The connection method according to claim 3, characterized in that: The welding step of the first ball head and the second ball head comprises: Spot welding the tangent points between the first ball head and the inner wall of the first positioning groove; Spot welding is performed on the tangent point between the second ball head and the inner wall of the second positioning groove.

8. The connection method according to claim 7, characterized in that: The tangent point between the first ball head and the inner wall of the first positioning groove and the tangent point between the second ball head and the inner wall of the second positioning groove are spot welded by laser welding.

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