Self-positioning assembly and projection welding device

Abstract

The application relates to a self-positioning assembly and a projection welding device. The self-positioning assembly comprises a base, a first mounting seat, a second mounting seat, a supporting piece and a positioning piece. The base is used for being mounted on a base body of the projection welding device. The first mounting seat is mounted on the base, and the second mounting seat is movably arranged on the first mounting seat along a first direction. The supporting piece is movably arranged on the second mounting seat along a second direction, and the second direction intersects the first direction. The positioning piece is arranged on the supporting piece, and the positioning piece is provided with a positioning part used for positioning a part to be welded. The self-positioning assembly has high adaptability, reduces process complexity, and has low limitation on a station device and size, thereby reducing cost.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a self-positioning component and projection welding device. Background Technology

[0002] In automotive R&D, projection welding of nuts is an essential welding process. Because projection welding of nuts is a manual production line operation with high precision requirements, its low accuracy and automation level have always been among the challenges in the industry. Typically, projection welding of large-sized parts requires robotic welding. The operator places the workpiece onto the workpiece fixture of a precision positioning trolley, pushes the trolley into the positioning mechanism, and then the robot uses a gripper to pick up the workpiece from the fixture and place it on a fixed projection welding machine for welding. This process is complex, has high requirements for equipment and station size, and involves significant investment. Utility Model Content

[0003] This application provides a self-positioning component and projection welding device, which aims to improve the problem of complex manual handling and welding operations of existing self-positioning components.

[0004] In a first aspect, this application provides a self-positioning assembly, comprising a base, a first mounting base, a second mounting base, a support member, and a positioning member. The base is for mounting on a projection welding apparatus. The first mounting base is mounted on the base, and the second mounting base is movably disposed on the first mounting base along a first direction. The support member is movably disposed on the second mounting base along a second direction, the second direction intersecting the first direction. The positioning member is disposed on the support member and has a positioning portion for positioning the part to be welded.

[0005] The second mounting base can drive the positioning part to achieve displacement in the first direction, and the support member can drive the positioning part to achieve displacement in the second direction. This enables the positioning part to achieve adaptive positioning when positioning the part to be welded. During the welding process, the part to be welded can be fixed in place, and the positioning part adaptively positions the part to be welded. The self-positioning movable self-positioning component provided in this application has high adaptability.

[0006] In some alternative examples, the positioning element is movably connected to the support element along a third direction, where the third direction, the second direction, and the first direction all intersect.

[0007] The adaptive displacement of each structure within the self-positioning assembly in the first, second, and third directions enables the positioning part to accurately locate the positioning holes of the sheet metal part.

[0008] In some alternative examples, the positioning element includes a lower electrode portion, a mounting portion, and a positioning portion. The lower electrode portion has a support surface for supporting the part to be welded. The positioning portion is disposed on the lower electrode portion and protrudes relative to the support surface. The mounting portion is connected to the lower electrode portion and is movably connected to the support element in a third direction.

[0009] The positioning element can move relative to the support element in a third direction, giving the positioning part an adjustment degree of freedom in the third direction, further improving the adaptability of the self-positioning component.

[0010] In some optional examples, the lower electrode portion is provided with a mounting hole, which is opened on the support surface and extends in a third direction, and the positioning portion is slidably inserted through the mounting hole; the positioning element also includes an elastic element, which is disposed in the mounting hole and elastically abuts against the bottom wall of the positioning portion and the mounting hole.

[0011] When matching parts to be welded, the elastic element can push the positioning part to remain in the extended high position, which can better position the sheet metal parts and nuts.

[0012] In some alternative examples, the positioning part is provided with an adjustment groove, and the positioning element also includes a limiting shaft, which passes through the lower electrode part and the adjustment groove, and the dimension of the adjustment groove in the third direction is larger than the outer diameter of the limiting shaft.

[0013] The setting of the limiting shaft improves the installation stability of the positioning part, and the adjustment groove, together with the limiting shaft, provides the positioning part with a third degree of freedom of displacement in the third direction while achieving a stable connection.

[0014] In some alternative examples, the support includes a connector and a support portion, the connector being slidably connected to a second mounting base, the support portion being connected to the connector and bent relative to the connector to extend in a third direction; a positioning element is disposed on the support portion.

[0015] The connecting part is used to realize the displacement of the positioning element on the support part, and the support part is used to raise the height of the positioning element to facilitate its cooperation with the welding gun.

[0016] In some alternative examples, the first mounting base is provided with a first groove, and the second mounting base is embedded in the first groove and connected to the first mounting base through a first sliding shaft; the first sliding shaft extends along a first direction, and the second mounting base is slidably sleeved on the first sliding shaft.

[0017] The second mounting base has a certain degree of displacement freedom in the first direction, which improves the adaptability of the self-positioning component.

[0018] In some alternative examples, the second mounting base is provided with a second groove, the support member is embedded in the second groove and connected to the second mounting base via a second sliding shaft; the second sliding shaft extends along a second direction, and the support member is slidably sleeved on the second sliding shaft.

[0019] The support component has a certain degree of displacement freedom in the second direction, which improves the adaptability of the self-positioning component.

[0020] In some alternative examples, the base has multiple sets of fixing holes arranged along a first direction, and the first mounting seat can be selectively connected to the base through at least one set of fixing holes.

[0021] The position of the first mounting base relative to the base in the first direction is selectable, further improving the adaptability of the self-positioning component.

[0022] Secondly, this application also provides a projection welding apparatus, including a substrate, a welding torch, and the aforementioned self-positioning component. The welding torch is mounted on the substrate and has an upper electrode portion. The self-positioning component is mounted on the welding torch via a base, and the positioning element is disposed opposite to the upper electrode portion.

[0023] The self-positioning component provided in this application is used in a projection welding device. During welding, the projection welding device moves to the underside of the part to be welded, aligning the positioning part with the positioning hole of the part. The second mounting base can drive the positioning part to move relative to the first mounting base along a first direction, and the support member can drive the positioning part to move relative to the second mounting base along a second direction. Through the adaptive displacement of each structure within the self-positioning component, the positioning part is aligned with the positioning hole of the part to be welded, and the positioning part passes through the positioning hole. A standard part conveyor or manual labor transports the standard part to the welding position. The upper electrode of the welding torch presses down, clamping the part to be welded before welding is performed.

[0024] The second mounting base can drive the positioning part to achieve displacement in the first direction, and the support member can drive the positioning part to achieve displacement in the second direction. This enables the positioning part to achieve adaptive positioning when positioning the part to be welded. During the welding process, the part to be welded can be fixed in place, and the positioning part adaptively positions the part to be welded. The self-positioning movable self-positioning component provided in this application has high adaptability, eliminating the need for manual removal of the part to be welded from the fixture and placement in the fixed welding position, reducing process complexity, and having fewer restrictions on the station equipment and size, thus reducing costs. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the projection welding device provided in one embodiment of this application.

[0027] Figure 2 yes Figure 1The diagram shows the structure of the part to be welded by the projection welding device.

[0028] Figure 3 This is a schematic diagram of the structure of a self-positioning component provided in an embodiment of this application.

[0029] Figure 4 yes Figure 3 The diagram shows a planar structural schematic of the base, first mounting base, and second mounting base of the self-positioning component.

[0030] Figure 5 yes Figure 4 A three-dimensional structural diagram of the base, the first mounting base, and the second mounting base shown.

[0031] Figure 6 yes Figure 2 The diagram shows the structure of the positioning element of the self-positioning component.

[0032] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure of the positioning component shown.

[0033] Figure 8 yes Figure 6 A schematic diagram of the positioning part of the positioning component shown.

[0034] Label Explanation: 100. Self-positioning component; 10. Base; 12. Fixing hole; 30. First mounting seat; 32. First slide groove; 34. First sliding shaft; 50. Second mounting seat; 52. Second slide groove; 54. Second sliding shaft; 70. Support member; 72. Connecting part; 74. Support part; 741. Clearance notch; 743. Sliding groove; 90. Positioning member; 92. Positioning part; 921. Guide slope; 923. Adjustment groove; 93. Limiting shaft; 94. Lower electrode part; 941. Support surface; 943. Mounting hole; 96. Mounting part; 98. Elastic member; 200. Projection welding device; 201. Welding torch; 2012. Upper electrode; 203. Substrate; 300. Parts to be welded; 301. Sheet metal parts; 302. Nuts. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0036] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem and basically achieve the technical effect within a certain margin of error.

[0037] Please also refer to Figure 1 and Figure 2 This application provides a self-positioning component 100, which can be applied to a projection welding device 200. The self-positioning component 100 can be mounted on the base 203 of the projection welding device 200 to facilitate welding of the part 300 to be welded with the welding torch 201 of the projection welding device 200. The part 300 to be welded may include a sheet metal part and a standard part, wherein the sheet metal part can be a housing, plate body, or other part, and the standard part can be a nut. As an example, the part 300 to be welded may include a sheet metal part 301 and a nut 302. The nut 302 is welded to one side of the sheet metal part 301 under the action of the projection welding device 200, and the sheet metal part 301 has a positioning hole communicating with the screw hole of the nut 302.

[0038] The projection welding device 200 may include a welding torch 201, a base 203, and the aforementioned self-positioning component 100. Both the welding torch 201 and the self-positioning component 100 may be mounted on the base 203. The self-positioning component 100 is used to position the nut 302 on the sheet metal part 301 at the welding point. The welding torch 201 is used to cooperate with the self-positioning component 100 to weld the nut 302 and the sheet metal part 301 together. This specification does not limit the specific structure of the base 203. For example, the base 203 may be a mechanical cantilever, a robot, a movable base, or even a manual welding clamp. The welding torch 201 may be movably connected to one end of the base 203; for example, it may be vertically and vertically connected to the base 203. This specification does not limit the specific type of the welding torch 201; for example, the welding torch 201 may be a laser welding torch or a resistance welding torch. In this embodiment, the welding torch 201 is a resistance spot welding torch. The welding torch 201 has an upper electrode portion 2012, and the self-positioning assembly 100 may include a structure for conducting electricity with the upper electrode portion 2012 to perform welding.

[0039] Please also refer to Figure 1 and Figure 3In this embodiment, the self-positioning component 100 may include a base 10, a first mounting base 30, a second mounting base 50, a support member 70, and a positioning member 90. The base 10 is mounted on the base 203 of the projection welding device 200. The first mounting base 30 is mounted on the base 10, and the second mounting base 50 is movably disposed on the first mounting base 30 along a first direction X. The support member 70 is movably disposed on the second mounting base 50 along a second direction Y, where the second direction Y intersects (e.g., is perpendicular to) the first direction X. The positioning member 90 is disposed on the support member 70 and has a positioning portion 92 for positioning the part 300 to be welded.

[0040] During welding, the sheet metal part 301 to be projected is first placed on a fixed precision positioning fixture. Then, the projection welding device 200 is moved to the position where projection welding is required, aligning the positioning part 92 of the self-positioning assembly 100 with the positioning hole of the sheet metal part 301. The second mounting base 50 can move the positioning part 92 relative to the first mounting base 30 along the first direction X, and the support member 70 can move the positioning part 92 relative to the second mounting base 50 along the second direction Y. Through the adaptive displacement of each structure within the self-positioning assembly 100, the positioning part 92 is aligned with the positioning hole of the sheet metal part 301, and the positioning part 92 passes through the positioning hole of the sheet metal part 301. The nut 302 (standard part) is conveyed to the position to be welded on the sheet metal part 301 by a standard parts conveyor or manually. The upper electrode 2012 of the welding torch 201 is pressed down, clamping the nut 302 and the sheet metal part 301 together, and then energizing is applied for welding (for example, one of the support 70 and the positioning part 90 may include the lower electrode), and the nut 302 and the sheet metal part 301 are integrated. After the projection welding process is completed, the projection welding device 200 is moved away as a whole and transferred to the next projection welding position for welding standard parts.

[0041] The second mounting base 50 can drive the positioning part 92 to achieve displacement in the first direction X, and the support member 70 can drive the positioning part 92 to achieve displacement in the second direction Y. This allows the positioning part 92 to achieve adaptive positioning when positioning the part to be welded 300. During the welding process, the part to be welded 300 can be fixed, and the positioning part 92 adaptively positions the sheet metal part 301. The self-positioning movable self-positioning component 100 provided in this application has high adaptability, eliminating the need for manual removal of the part to be welded 300 from the fixture and placement in the fixed welding position, reducing process complexity, and having lower limitations on the station equipment and size, thus reducing costs.

[0042] In this embodiment, the base 10 is connected to the base 203, and the self-positioning component 100 is mounted on the base 203 via the base 10. The base 10 supports other structures of the self-positioning component 100. The base 10 is generally rectangular in shape and can be fixed to the base 203 by fasteners such as screws and bolts. The base 10 may have multiple sets of fixing holes 12 for mounting the first mounting seat 30. The multiple sets of fixing holes 12 are arranged along a first direction X, and each set of fixing holes 12 may include two fixing holes arranged along a second direction Y. This specification does not limit the specific directions of the first direction X and the second direction Y. For example, the first direction X can be the length direction of the rectangular base 10 or the width direction of the base 10. As an example, the first direction X is the length direction of the base 10, and the second direction Y is the width direction of the base 10.

[0043] The first mounting base 30 can be selectively connected to the base 10 via at least one set of fixing holes 12. The position of the first mounting base 30 relative to the base 10 in the first direction X is adjustable, further improving the adaptability of the self-positioning assembly 100.

[0044] Please also refer to Figure 3 , Figure 4 and Figure 5 The fixing hole 12 can be a threaded hole, and the first mounting base 30 can be bolted to the base 10. The first mounting base 30 is provided with a first sliding groove 32 for mounting a second mounting base 50. The second mounting base 50 is embedded in the first sliding groove 32 and connected to the first mounting base 30 via a first sliding shaft 34. The first sliding groove 32 extends through the first mounting base 30 along the second direction Y, and the first sliding shaft 34 is disposed within the first sliding groove 32 along the first direction X and is fixedly connected to the first mounting base 30. The second mounting base 50 is embedded in the first sliding groove 32, and the first sliding shaft 34 passes through the second mounting base 50 and slides with it. The dimension of the first sliding groove 32 in the first direction X is larger than the dimension of the second mounting base 50 in the first direction X, so that the second mounting base 50 can move within the first sliding groove 32 along the first direction X. The second mounting base 50 has a certain degree of displacement freedom in the first direction X, improving the adaptability of the self-positioning component 100.

[0045] This specification does not limit the specific number of the first sliding shafts 34. There can be one or more first sliding shafts 34. In this embodiment, the number of first sliding shafts 34 can be set to two. The two first sliding shafts 34 are arranged side-by-side with a gap along the second direction Y. The two first sliding shafts 34 improve the stability of the movement of the second mounting base 50 relative to the first mounting base 30.

[0046] The second mounting base 50 may have a second sliding groove 52 on the side opposite to the first mounting base 30. The second sliding groove 52 is used for embedding the support member 70, which is connected to the second mounting base 50 via a second sliding shaft 54. The second sliding groove 52 extends through the second mounting base 50 along the first direction X, and its bottom is slightly higher than the upper surface of the first mounting base 30 to facilitate the installation and movement of the support member 70. The second sliding shaft 54 ​​is disposed within the second sliding groove 52 along the second direction Y and is fixedly connected to the second mounting base 50. The second mounting base 50 is embedded within the second sliding groove 52, and the second sliding shaft 54 ​​slides through the support member 70. The dimension of the second sliding groove 52 in the second direction Y is larger than that of the support member 70 in the second direction Y, so that the support member 70 can move relative to the second mounting base 50 within the second sliding groove 52. The support member 70 has a certain degree of displacement freedom in the second direction Y, improving the adaptability of the self-positioning assembly 100.

[0047] This specification does not limit the specific number of the second sliding shafts 54. There may be one or more second sliding shafts 54. In this embodiment, the number of second sliding shafts 54 may be set to two. The two second sliding shafts 54 are arranged side-by-side with a gap along the first direction X. The two second sliding shafts 54 improve the stability of the support member 70 relative to the second mounting base 50.

[0048] In this embodiment, the support member 70 is connected between the second mounting base 50 and the positioning member 90, and is used to support the positioning member 90. The support member 70 may include a connecting portion 72 and a supporting portion 74. The connecting portion 72 is slidably connected to the second mounting base 50, and the supporting portion 74 is connected to the connecting portion 72 and bent relative to the connecting portion 72 to extend in the third direction Z. The positioning member 90 is disposed on the supporting portion 74. The connecting portion 72 is used to realize the displacement of the positioning member 90 on the supporting portion 74, and the supporting portion 74 is used to raise the height of the positioning member 90 to facilitate connection with the welding torch 201 (e.g., Figure 1 (As shown)

[0049] The connecting portion 72 is generally rectangular in shape. Part of the connecting portion 72 is embedded in the second slide groove 52, and part of the connecting portion 72 extends out of the second slide groove 52 along the first direction X and is located on the first mounting base 30. The support portion 74 is connected to the end of the connecting portion 72 located outside the second slide groove 52 and is bent away from the base 10 relative to the connecting portion 72. The support portion 74 and the connecting portion 72 can be integrally formed. The support portion 74 extends along a third direction Z, which intersects (e.g., perpendicularly) both the first direction X and the second direction Y. In this embodiment, the third direction Z is the thickness direction of the base 10. The support portion 74 may be provided with a clearance notch 741, which penetrates the support portion 74 along the third direction Z and the first direction X. The clearance notch 741 can be used to allow the structure of the projection welding device 200 (e.g., support structure, pipeline structure, etc.) to cooperate and connect with the positioning member 90.

[0050] Please also refer to Figure 1 , Figure 3 and Figure 6 In this embodiment, the positioning member 90 is connected to the end of the support portion 74 away from the connecting portion 72, and the positioning member 90 is disposed opposite to the upper electrode portion 2012. The positioning member 90 is used to support the sheet metal part 301 and position the nut 302, and cooperates with the upper electrode portion 2012 to weld the part 300 to be welded. The positioning member 90 is movably connected to the support portion 74 along the third direction Z, and the positioning member 90 can move relative to the support portion 74 along the third direction Z, so that the positioning portion 92 has a degree of adjustment freedom in the third direction Z, further improving the adaptability of the self-positioning assembly 100.

[0051] The positioning member 90 may include a lower electrode portion 94, a mounting portion 96, and a positioning portion 92. The lower electrode portion 94 has a support surface 941 for supporting the part 300 to be welded. The positioning portion 92 is disposed on the lower electrode portion 94 and protrudes relative to the support surface 941. The mounting portion 96 is connected to the lower electrode portion 94 and is movably connected to the support member 70 along the third direction Z. In this embodiment, the lower electrode portion 94 of the positioning member 90 serves as the lower electrode portion that cooperates with the upper electrode portion 2012 of the welding torch 201. During welding, the sheet metal part 301 is located on the support surface 941, the positioning portion 92 protrudes from the positioning hole of the sheet metal part 301, and the nut 302 is sleeved on the positioning portion 92. The upper electrode portion 2012 of the welding torch 201 is pressed down, which, in conjunction with the support surface 941 of the lower electrode portion 94, presses the nut 302 and the sheet metal part 301 together. Then, the upper electrode portion 2012 and the lower electrode portion 94 are energized. At this time, the current is concentrated at the weld foot of the nut 302 and a large amount of heat is obtained at the weld foot, thereby forming a molten nugget and bonding between the nut 302 and the sheet metal part 301, thus achieving spot welding.

[0052] In some embodiments, the projection welding device 200 may further include a transformer, a conductive element, or other structures disposed on the base 203. The transformer outputs current, which enters the nut 302 from the upper electrode portion 2012 on the welding torch 201, passes through the contact point between the nut 302 and the sheet metal part 301 (where the resistance is highest, thus generating high temperature to melt the metal), and is then transmitted to the lower electrode portion 94 through the sheet metal part 301. The conductive element is electrically connected between the lower electrode portion 94 and the transformer, and the lower electrode portion 94 conducts the current back to the transformer through the conductive element to form a closed loop. The conductive element can be a cable or a conductive arm, and the conductive element can be disposed within the clearance notch 741 of the support member 70.

[0053] In this embodiment, the lower electrode portion 94 is generally columnar and is movably connected to the support portion 74 along the third direction Z via the mounting portion 96. The mounting portion 96 is fixedly connected to the peripheral wall of the lower electrode portion 94 and protrudes relative to the peripheral wall. The support portion 74 is provided with a sliding groove 743, which penetrates the support portion 74 along the second direction Y and communicates with the clearance notch 741. Specifically, in this embodiment, there are two sliding grooves 743, which are respectively opened on opposite sides of the support portion 74 and both communicate with the clearance notch 741. Correspondingly, there can also be two mounting portions 96, which are respectively connected to opposite sides of the lower electrode portion 94 and respectively embedded in the corresponding sliding grooves 743. The dimension of the sliding groove 743 in the third direction Z is larger than the dimension of the mounting portion 96 in the third direction Z, so that the mounting portion 96 can slide relative to the support portion 74 along the third direction Z, thereby improving the adaptability of the self-positioning component 100. The two mounting parts 96 can be integrally formed on the lower electrode part 94, or they can be connected to the peripheral wall of the lower electrode part 94 by fasteners.

[0054] During welding, the upper electrode 2012 presses down to cooperate with the lower electrode 94. When welding, the lower electrode 94 is pressed down, causing the mounting part 96 to move along the third direction Z in the sliding groove 743 until it touches the bottom. After one welding is completed, the lower electrode 94 can be lifted up with welding pliers, so that the mounting part 96 moves up in the sliding groove 743 to reset, which facilitates the degree of freedom of movement when matching for the next welding.

[0055] Please also refer to Figure 1 , Figure 6 and Figure 7The lower electrode portion 94 may also be provided with a mounting hole 943, which is formed on the support surface 941 and extends in the third direction Z. The positioning portion 92 is slidably disposed in the mounting hole 943. The positioning member 90 may also include an elastic member 98, which is disposed in the mounting hole 943 and elastically abuts against the bottom wall of the positioning portion 92 and the mounting hole 943. The positioning portion 92 can be connected to the bottom of the mounting hole 943 through the elastic member 98, and the positioning portion 92 can move axially relative to the lower electrode portion 94 along the mounting hole 943 under the action of the elastic member 98. When matching the part to be welded 300, the elastic member 98 can push the positioning portion 92 to remain in the extended high position, which can better position the sheet metal part 301 and the nut 302. During welding, the welding torch 201 drives the upper electrode 2012 to press down, which can press down the area of ​​the positioning part 92 that exceeds the height of the nut 302, making it flush with or lower than the upper surface of the nut 302, which is beneficial for the uniformity of the end face shape and processing.

[0056] The support surface 941 is the end face of the lower electrode portion 94, and the support surface 941 is flat to stably support the sheet metal part 301. The upper electrode portion 2012 may also have a clamping plane on the side opposite to the support surface 941, which is used to apply the pressure and current required for projection welding. The mounting hole 943 has an axis direction approximately in the same direction as the third direction Z, and the mounting hole 943 is a blind hole. An elastic element 98 is disposed in the mounting hole 943 and abuts against the bottom wall of the mounting hole 943. This specification does not limit the specific type of the elastic element 98; for example, the elastic element 98 can be a spring, an air bladder, or other structures. In this embodiment, the elastic element 98 is a spring, which can be fixed at one end to the bottom wall of the mounting hole 943 and at the other end to the bottom end of the positioning portion 92. The positioning portion 92 can be a cylindrical part, and the positioning portion 92 is slidably embedded in the mounting hole 943. To facilitate alignment and positioning of the part 300 to be welded by engaging with the positioning holes of the sheet metal part 301, a guide slope 921 can be provided at the end of the positioning part 92 away from the elastic member 98. The guide slope 921 is provided along the circumference of the positioning part 92 so that the end of the positioning part 92 is approximately tapered. The material of the positioning part 92 can be an insulating material with good high-temperature resistance, such as ceramic.

[0057] Please also refer to Figure 7 and Figure 8To improve the installation stability between the positioning part 92 and the lower electrode part 94, in this embodiment, the positioning part 92 may be provided with an adjustment groove 923, and the positioning member 90 may further include a limiting shaft 93. The limiting shaft 93 passes through the lower electrode part 94 and the adjustment groove 923, and the dimension of the adjustment groove 923 along the third direction Z is larger than the outer diameter of the limiting shaft 93. The limiting shaft 93 passes through both the lower electrode part 94 and the positioning part 92 to connect the positioning part 92 and the lower electrode part 94. The dimension of the adjustment groove 923 along the third direction Z is larger than the outer diameter of the limiting shaft 93, so that there is relative displacement between the positioning part 92 and the lower electrode part 94 in the third direction Z.

[0058] An adjustment groove 923 is formed on the peripheral wall of the positioning part 92 and extends through the positioning part 92 roughly radially. The adjustment groove 923 extends in a waist-shaped groove along the third direction Z to provide space for the positioning part 92 to move. The extension direction of the limiting shaft 93 intersects with the third direction Z. A shaft hole is formed on the lower electrode part 94 for the limiting shaft 93 to pass through, and the shaft hole connects to the mounting hole 943. The setting of the limiting shaft 93 improves the installation stability of the positioning part 92. The adjustment groove 923, in conjunction with the limiting shaft 93, provides the positioning part 92 with a third direction Z degree of freedom for displacement while achieving a stable connection.

[0059] During welding, the self-positioning component 100 provided in this application first places the sheet metal part 301 to be projected onto a fixed precision positioning fixture. Then, the projection welding device 200 is moved to the underside of the positioned sheet metal part 301, aligning the positioning part 92 of the self-positioning component 100 with the positioning hole of the sheet metal part 301 and moving towards the sheet metal part 301. Through the adaptive displacement of the various structures within the self-positioning component 100 in the first direction X, the second direction Y, and the third direction Z, the positioning part 92 accurately locates the positioning hole of the sheet metal part 301. During the matching process, the elastic member 98 can push the positioning part 92 to remain in the extended high position, which can better position the sheet metal part 301 and the nut 302. The positioning part 92 passes through the positioning hole of the sheet metal part 301, and the supporting surface 941 is in contact with the lower surface of the sheet metal part 301 to support the sheet metal part 301. Then, the nut 302 is placed on the sheet metal part 301, and the positioning part 92 extends out from the screw hole of the nut 302. The welding torch 201 drives the upper electrode 2012 downwards, pressing down the area of ​​the positioning part 92 that extends beyond the height of the nut 302, making it flush with or lower than the upper surface of the nut 302, which facilitates uniformity of the end face shape and processing. Current is concentrated at the welding feet of the nut 302, where a large amount of heat is generated, forming a weld nugget between the nut 302 and the sheet metal part 301, thus bonding them together. After the projection welding process is completed, the projection welding device 200 moves away to the next projection welding position for welding standard parts. The self-positioning component 100 provided in this embodiment has good flexibility, high adaptability, and reduced cost.

[0060] Terminology Explanation In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A self-positioning component, characterized in that, include: Base, used for mounting on projection welding equipment; A first mounting base is installed on the base; The second mounting base is movably disposed on the first mounting base along the first direction; A support member is movably disposed on the second mounting base along a second direction, the second direction intersecting the first direction; And a positioning element disposed on the support member, the positioning element having a positioning portion for positioning the part to be welded.

2. The self-positioning component as described in claim 1, characterized in that, The positioning element is movably connected to the support element along a third direction, and the third direction, the second direction, and the first direction all intersect.

3. The self-positioning component as described in claim 2, characterized in that, The positioning member includes a lower electrode portion, a mounting portion, and the positioning portion. The lower electrode portion has a support surface for supporting the part to be welded. The positioning portion is disposed on the lower electrode portion and protrudes relative to the support surface. The mounting portion is connected to the lower electrode portion and is movably connected to the support member along the third direction.

4. The self-positioning component as described in claim 3, characterized in that, The lower electrode portion is provided with a mounting hole, which is opened on the support surface and extends along the third direction. The positioning portion is slidably inserted through the mounting hole. The positioning member also includes an elastic member, which is disposed in the mounting hole and elastically abuts against the positioning portion and the bottom wall of the mounting hole.

5. The self-positioning component as described in claim 3, characterized in that, The positioning part is provided with an adjustment groove, and the positioning component also includes a limiting shaft. The limiting shaft passes through the lower electrode part and the adjustment groove, and the dimension of the adjustment groove along the third direction is larger than the outer diameter of the limiting shaft.

6. The self-positioning component as described in claim 2, characterized in that, The support member includes a connecting portion and a supporting portion. The connecting portion is slidably connected to the second mounting base, and the supporting portion is connected to the connecting portion and bent relative to the connecting portion to extend along the third direction. The positioning member is disposed on the supporting portion.

7. The self-positioning component as described in any one of claims 1 to 6, characterized in that, The first mounting base is provided with a first sliding groove, and the second mounting base is embedded in the first sliding groove and connected to the first mounting base through a first sliding shaft; the first sliding shaft extends along the first direction, and the second mounting base is slidably sleeved on the first sliding shaft.

8. The self-positioning component as described in claim 7, characterized in that, The second mounting base is provided with a second sliding groove, the support member is embedded in the second sliding groove and connected to the second mounting base through a second sliding shaft; the second sliding shaft extends along the second direction, and the support member is slidably sleeved on the second sliding shaft.

9. The self-positioning component as described in claim 7, characterized in that, The base has multiple sets of fixing holes arranged along the first direction, and the first mounting seat can be selectively connected to the base through at least one set of fixing holes.

10. A projection welding device, characterized in that, include: Matrix; A welding torch is mounted on the substrate, and the welding torch has an upper electrode portion; And a self-positioning component as described in any one of claims 1 to 9, wherein the self-positioning component is mounted on the base via the base, and the positioning element is disposed opposite to the upper electrode portion.

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