A butt welding tool for nut welding

Abstract

The utility model discloses a kind of for nut welding's butt welding tool, including the lower die plate of upper and lower superposition and fit, lower backing plate, lower electrode is installed in lower die plate upwardly protruding, and movable pin is installed from lower to upper through lower die plate, lower electrode;Upper electrode is equipped above lower electrode, product and nut are located between upper electrode, lower electrode;Still include the positioning block that towards or is away from nut horizontal lateral movement;When using, the relative position of product, nut is positioned alignment by movable pin, in combination with the positioning of nut appearance by positioning block, effectively guarantee the relative position of nut on product when butt welding, guarantee the consistency of welding, and help to the use of automatic string line.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a spot welding fixture for welding nuts. Background Technology

[0002] Welding is a widely used connection method in automobile manufacturing. Spot welding, as a type of welding, is also involved in the production of automotive parts; for example, spot welding is commonly used for welding nuts on floor brackets.

[0003] In existing technology, the nut and the floor bracket are usually fixed in position manually, and then their contact points are clamped onto a welding table with electrodes. The equipment is operated so that the welding mechanism with irregularly shaped electrodes moves toward the welding table. After contact, the welding surfaces abut against each other, and then the two electrodes connected to the welding table and welding mechanism are energized to achieve welding of the nut on the floor bracket.

[0004] The existing operating method is prone to positional errors of the nut on the floor support and is difficult to meet the angle and shape requirements of the nut on the floor support, resulting in uneven welding positions, poor appearance consistency, and difficulty in connecting to automated production lines. Utility Model Content

[0005] To address the aforementioned issues, this application provides a reasonably structured spot welding fixture for nut welding, which effectively ensures the relative position of the nut on the product during spot welding, guarantees welding consistency, and facilitates automated assembly line applications.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A spot welding fixture for welding nuts includes a lower template and a lower pad that are stacked and fitted together. A lower electrode that protrudes upward is installed on the lower template. A movable pin is installed through the lower template and the lower electrode from bottom to top. An upper electrode is arranged above the lower electrode. The product and the nut are located between the upper electrode and the lower electrode. It also includes a positioning block that can move horizontally toward or away from the nut.

[0008] As a further improvement to the above technical solution:

[0009] The product is supported by an external support mechanism, and the bottom surface of the product at the position where the nut is to be welded fits against the top surface of the lower electrode.

[0010] The upper electrode and the lower electrode are respectively located above and below the nut.

[0011] The lower template has a through hole, and the upper opening of the through hole has an upwardly flared conical structure, through which the lower electrode is fitted.

[0012] The lower electrode includes a tapered portion that is smaller at the bottom and larger at the top, with a cylindrical portion extending from the top of the tapered portion. The diameter of the cylindrical portion is larger than the diameter of the larger end of the tapered portion. There is a gap between the bottom surface of the cylindrical portion and the top surface of the lower template.

[0013] A countersunk hole is provided on the top surface of the lower pad plate located below the through hole of the lower template, and an elastic element is installed between the bottom surface of the countersunk hole and the bottom surface of the movable pin.

[0014] The lower electrode has a central hole through which the movable pin passes, and the central hole has a stepped hole structure that is larger at the bottom and smaller at the top.

[0015] The upper electrode is embedded in the bottom surface of the fixed base, and the fixed base supports the upper electrode plate; the bottom surface of the fixed base has a tapered hole with a smaller top and a larger bottom for mounting the upper electrode, and the bottom end of the upper electrode protrudes downward from the bottom surface of the fixed base.

[0016] The bottom surface of the lower pad is mounted on the lower electrode plate. A support is mounted on the lower electrode plate located on the outside of the lower pad. A linear drive mechanism is mounted on the support via a fixing plate. A positioning block is mounted on the horizontal output end of the linear drive mechanism. A guide block is also mounted on the support for the positioning block to slide through.

[0017] The nut has a square structure, and the end of the positioning block facing the nut is set with a matching concave structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When in use, this utility model uses a movable pin to position and align the relative positions of the product and the nut, and a positioning block to position the shape of the nut, effectively ensuring the relative position of the nut on the product during spot welding, ensuring the consistency of the welding, and facilitating automated wiring. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram showing the assembly of the lower pad, lower template, lower electrode, and movable pin of this utility model.

[0022] Figure 3 This is a schematic diagram showing the arrangement of the positioning block and nut of this utility model.

[0023] Figure 4 This is a schematic diagram of the state during spot welding of this utility model.

[0024] The components are as follows: 1. Lower electrode plate; 2. Lower pad plate; 3. Elastic element; 4. Lower template; 5. Lower electrode; 6. Movable pin; 7. Support; 8. Linear drive mechanism; 9. Fixed plate; 10. Positioning block; 11. Guide block; 12. Positioning pin; 13. Upper electrode; 14. Fixed seat; 15. Upper electrode plate; 100. Product; 200. Nut; 21. Countersunk hole; 41. Through hole; 51. Cylindrical part; 52. Conical part; 101. Concave structure. Detailed Implementation

[0025] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, a spot welding fixture for nut welding in this embodiment includes a lower template 4 and a lower pad 2 that are stacked and fitted together. A lower electrode 5 protruding upward is installed on the lower template 4. A movable pin 6 is installed from bottom to top through the lower template 4 and the lower electrode 5. An upper electrode 13 is arranged above the lower electrode 5. The product 100 and the nut 200 are located between the upper electrode 13 and the lower electrode 5. It also includes a positioning block 10 that can move horizontally toward or away from the nut 200.

[0027] In use, the movable pin 6 passes upward through the product 100 and the nut 200. The movable pin 6 positions and aligns the relative positions of the product 100 and the nut 200. Combined with the positioning block 10 positioning the shape of the nut 200, the relative position of the nut 200 on the product 100 is effectively guaranteed during spot welding.

[0028] During welding, the upper electrode 13 moves down to abut against the top surface of the nut 200. Then, the upper electrode 13 and the lower electrode 5 are energized, causing the contact area between the nut 200 and the product 100 to melt. Combined with the application of pressure, the contact area undergoes plastic deformation and forms common grains, thus achieving welding.

[0029] Product 100 is supported by an external support mechanism. The bottom surface of Product 100 at the position where the nut 200 is to be welded is attached to the top surface of the lower electrode 5, while the upper electrode 13 is attached to the top surface of the nut 200 during welding, thereby effectively realizing and ensuring the spot welding connection of the nut 200 on Product 100.

[0030] In this embodiment, while the product 100 is reliably supported by the external support mechanism, it can also be positioned horizontally by means of positioning pins 12, etc., so as to effectively ensure that the position of the product 100 is fixed during welding.

[0031] The upper electrode 13 and the lower electrode 5 are positioned directly above and below the nut 200, respectively, so that spot welding can be achieved via the downward movement of the upper electrode 13.

[0032] like Figure 2As shown, a through hole 41 is provided on the lower template 4. The upper opening of the through hole 41 is a tapered structure that flares outwards, through which the lower electrode 5 is fitted.

[0033] The lower electrode 5 includes a tapered portion 52 that is smaller at the bottom and larger at the top, and a cylindrical portion 51 extending from the top of the tapered portion 52. The diameter of the cylindrical portion 51 is larger than the diameter of the larger end of the tapered portion 52. There is a gap between the bottom surface of the cylindrical portion 51 and the top surface of the lower template 4.

[0034] In this embodiment, the lower electrode 5 is fitted into the through hole 41 of the lower template 4 from top to bottom through the tapered part 52. The contact matching between the upper tapered structure of the through hole 41 and the tapered part 52 effectively ensures the reliable installation of the lower electrode 5 on the lower template 4.

[0035] During actual welding, the downward pressure borne by the lower electrode 5 will be transmitted to the lower template 4 through the tapered matching tapered part 52 and the tapered structure.

[0036] A countersunk hole 21 is provided on the top surface of the lower pad plate 2 located below the through hole 41 of the lower template 4. An elastic element 3 is installed between the bottom surface of the countersunk hole 21 and the bottom surface of the movable pin 6 to realize the elastic installation of the movable pin 6, effectively ensuring the positioning reliability of the movable pin 6 and reducing or even avoiding hard contact.

[0037] The lower electrode 5 has a central hole through which the movable pin 6 passes. The central hole has a stepped hole structure that is larger at the bottom and smaller at the top. The stepped hole structure restricts the relative upward movement of the movable pin 6, effectively preventing the movable pin 6 from detaching upward.

[0038] The upper electrode 13 is embedded in the bottom surface of the fixing base 14, and the fixing base 14 is supported and installed on the upper electrode plate 15. The bottom surface of the fixing base 14 has a tapered hole with a smaller top and a larger bottom for mounting the upper electrode 13, and the bottom end of the upper electrode 13 protrudes downward from the bottom surface of the fixing base 14.

[0039] In this embodiment, the upper electrode plate 15 and the lower electrode plate 1 are connected to two electrodes of an external power source. After the upper electrode 13 moves down and abuts against the nut 200, the two electrodes are energized to perform spot welding.

[0040] The bottom surface of the lower pad 2 is mounted on the lower electrode plate 1. A support 7 is mounted on the lower electrode plate 1 located outside the lower pad 2. A linear drive mechanism 8 is mounted on the support 7 via a fixing plate 9. A positioning block 10 is mounted on the horizontal output end of the linear drive mechanism 8. A guide block 11 is also mounted on the support 7 for the positioning block 10 to slide through.

[0041] In this embodiment, the linear drive mechanism 8 can be a commonly used linear drive power such as a cylinder, which drives the positioning block 10 to move horizontally toward or away from the nut 200 with the guide block 11 as the guide.

[0042] like Figure 3As shown, the nut 200 has a square structure, and the end of the positioning block 10 facing the nut 200 is provided with a matching concave structure 101.

[0043] In this embodiment, the concave structure 101 on the positioning block 10 is adapted to the nut 200. The concave structure 101 limits the nut 200 to prevent the nut 200 from rotating during the welding process, effectively ensuring the consistency of the position and angle of the nut 200 on the product 100 after welding.

[0044] The method of using this utility model is as follows:

[0045] Product 100 is placed on an external support mechanism. The orifice of the nut 200 to be welded on product 100 is fitted onto the movable pin 6, and the nut 200 is placed on the movable pin 6, completing the loading. The linear drive mechanism 8 operates, driving the positioning block 10 to move toward the nut 200 until it reaches a preset position. The positioning block 10 circumferentially restricts the nut 200 to prevent rotation. Then, the external drive mechanism drives the upper electrode plate 15, the fixed seat 14, and the upper electrode 13 downwards until the bottom surface of the upper electrode 13 contacts the top surface of the nut 200. The upper electrode 13 and the lower electrode 5 are connected to the two electrodes, causing the contact area between the nut 200 and product 100 to melt. Combined with the continuous pressure from the external drive mechanism, the contact surface between the bottom end of the nut 200 and product 100 undergoes plastic deformation and forms common grains, completing the spot welding. Figure 4 As shown.

[0046] In this embodiment, the spot welding fixture can be connected to an automated production line, and the product 100 and nut 200 can be automatically fed using external robotic arms or other clamping and moving parts.

[0047] This invention effectively ensures the relative position of the nut on the product during spot welding, guarantees the consistency of the welding, and facilitates automated wiring applications.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A spot welding fixture for welding nuts, characterized in that: The device includes a lower template (4) and a lower pad (2) that are stacked together. A lower electrode (5) protruding upward is installed on the lower template (4). A movable pin (6) is installed from bottom to top through the lower template (4) and the lower electrode (5). An upper electrode (13) is arranged above the lower electrode (5). The product (100) and the nut (200) are located between the upper electrode (13) and the lower electrode (5). The device also includes a positioning block (10) that moves horizontally toward or away from the nut (200). The bottom surface of the lower pad (2) is mounted on the lower electrode plate (1). A support (7) is mounted on the lower electrode plate (1) located outside the lower pad (2). A linear drive mechanism (8) is mounted on the support (7) via a fixing plate (9). A positioning block (10) is mounted on the horizontal output end of the linear drive mechanism (8). A guide block (11) is also mounted on the support (7) for the positioning block (10) to slide through.

2. The spot welding fixture for nut welding as described in claim 1, characterized in that: The product (100) is supported by an external support mechanism, and the bottom surface of the product (100) at the position where the nut (200) is to be welded is attached to the top surface of the lower electrode (5).

3. The spot welding fixture for nut welding as described in claim 1, characterized in that: The upper electrode (13) and the lower electrode (5) are respectively located above and below the nut (200).

4. The spot welding fixture for nut welding as described in claim 1, characterized in that: The lower template (4) has a through hole (41), and the upper opening of the through hole (41) is a cone-shaped structure that flares outward. The lower electrode (5) is fitted through the cone-shaped structure.

5. A spot welding fixture for nut welding as described in claim 1 or 4, characterized in that: The lower electrode (5) includes a tapered part (52) that is smaller at the bottom and larger at the top, and a cylindrical part (51) extends from the top of the tapered part (52). The diameter of the cylindrical part (51) is larger than the diameter of the larger end of the tapered part (52). There is a gap between the bottom surface of the cylindrical part (51) and the top surface of the lower template (4).

6. A spot welding fixture for nut welding as described in claim 4, characterized in that: A countersunk hole (21) is provided on the top surface of the lower pad plate (2) located below the through hole (41) of the lower template (4). An elastic element (3) is installed between the bottom surface of the countersunk hole (21) and the bottom surface of the movable pin (6).

7. A spot welding fixture for nut welding as described in claim 1 or 6, characterized in that: The lower electrode (5) has a central hole through which the movable pin (6) passes. The central hole has a stepped hole structure with a larger bottom and a smaller top.

8. A spot welding fixture for nut welding as described in claim 1, characterized in that: The upper electrode (13) is embedded in the bottom surface of the fixed base (14), and the fixed base (14) is supported and installed on the upper electrode plate (15). The bottom surface of the fixed base (14) is provided with a tapered hole that is smaller at the top and larger at the bottom for the upper electrode (13) to be fitted, and the bottom end of the upper electrode (13) protrudes downward from the bottom surface of the fixed base (14).

9. A spot welding fixture for nut welding as described in claim 1, characterized in that: The nut (200) has a square structure, and the end of the positioning block (10) facing the nut (200) is set with a matching concave structure (101).

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