Electric resistance welding assembly applied to cover type nut

Abstract

The utility model discloses an electric resistance welding assembly applied to a cover type nut, which comprises an upper electrode piece and a lower electrode piece which correspond to each other and are respectively provided with an upper mounting groove and a lower mounting groove which are used for mounting a workpiece, and further comprises a conductive ejector rod, a locking piece and a conductive spring, the upper electrode piece is connected with a conductive ejector rod used for increasing the conductive area in a sliding mode, the top of the upper electrode piece is connected with a locking piece in a threaded mode, and a conductive spring is arranged between the locking piece and the conductive ejector rod. The conductive ejector rod is in direct contact with the top of the gland, a current conduction path is increased in the welding process, the effective conductive area between the upper electrode piece and the gland is increased, the problems of electric spark splashing, welding spot bursting and the like caused by the insufficient conductive area are effectively solved, and the stability of resistance welding and the welding spot forming quality are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of welding, and in particular to a resistance welding assembly for cap nuts. Background Technology

[0002] Cap nuts, a special type of fastener with a closed upper end and a threaded lower end, are widely used on automobile wheels. Cap nuts are usually connected to a cap by resistance welding. For example, patent number CN201020670400.0 discloses a projection welding device for cap nuts. By setting a nut sleeve and upper and lower electrode clamping structure, combined with the principle of resistance welding, it realizes the rapid clamping and welding of cap nuts, effectively improving the production efficiency of cap nuts.

[0003] However, traditional projection welding devices are not suitable for cap nuts with small effective energizing areas. Because the outer edge area of ​​the cap nut is small, when the upper and lower electrode arms are energized, the current can only be conducted through the outer edge area of ​​the cap, which can easily lead to excessively high current density in the local area of ​​the cap. This can cause electric sparks or even weld cracking when the cap and nut are welded, directly affecting the stability of the welding quality and the connection strength. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a resistance welding assembly for cap nuts, including corresponding upper electrode and lower electrode, the upper electrode and lower electrode respectively provided with upper mounting groove and lower mounting groove for mounting workpiece, and further including a conductive top rod, a locking member and a conductive spring, the upper electrode being slidably connected to a conductive top rod for increasing the conductive area, the top of the upper electrode being threadedly connected to a locking member, and a conductive spring being provided between the locking member and the conductive top rod.

[0005] By adopting the above technical solution, a conductive top rod structure is added to the traditional resistance welding assembly. The conductive top rod directly contacts the top of the pressure cap, increasing the current conduction path during the welding process and increasing the effective conductive area between the upper electrode and the pressure cap. This effectively avoids problems such as electric sparks splashing and weld cracking caused by insufficient conductive area, thereby improving the stability of resistance welding and the quality of weld formation.

[0006] The present invention is further configured such that the upper electrode component has a sliding groove and a threaded portion coaxially distributed with the upper mounting groove, the conductive push rod is slidably connected to the sliding groove, the locking component is threadedly connected to the threaded portion, and the conductive push rod is electrically connected to the upper electrode component in sequence through a conductive spring and a locking component.

[0007] Furthermore, the chute is provided with a stepped portion, and the conductive top rod is provided with a cylindrical portion corresponding to the stepped portion.

[0008] With the above technical solution, the conductive ejector rod, the locking member, and the conductive spring are all made of phosphor bronze. The upper electrode member and the lower electrode member are respectively connected to the positive and negative electrodes of the power supply. When the upper electrode member and the lower electrode member control the pressing of the gland and the nut, the current sequentially passes through the locking member, the conductive spring, and the conductive ejector rod and flows to the workpiece, increasing the effective conductive area.

[0009] The present utility model is further configured such that the upper mounting groove is a cylindrical groove for accommodating the gland, and the bottom surface of the upper electrode member is the contact surface 15.

[0010] With the above technical solution, the cross-section of the gland is in a shape like a capital letter "J" with the middle part protruding. The upper electrode member accommodates the middle part of the gland through the cylindrical groove and abuts against the outer edge of the gland through its bottom surface, thus realizing the resistance welding of the gland and the nut.

[0011] The present utility model is further configured such that the lower mounting groove is a conical groove for mounting the nut.

[0012] With the above technical solution, the bottom of the nut is provided with a conical surface adapted to the conical groove. When installing the nut, it realizes the automatic centering and positioning of the nut and the gland, improves the welding accuracy and is suitable for mass production.

[0013] The present utility model is further configured such that the ends of the upper electrode member and the lower electrode member are provided with conical surfaces for centering.

[0014] With the above technical solution, the upper electrode member and the lower electrode member are respectively connected to the positive electrode arm and the negative electrode arm through the conical surfaces, realizing the coaxial distribution of the upper electrode member and the lower electrode member, providing a fundamental reference guarantee for the precise installation and positioning of the nut and the gland.

[0015] The following further describes the embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0016] Figure 1 is an exploded view of the structure of the present utility model.

[0017] Figure 2 is a cross-sectional view of the upper electrode member of the present utility model.

[0018] Figure 3 is a cross-sectional view when the nut and the gland are pressed together in the present utility model.

[0019] Figure 4 is the Figure 3 partial enlarged view at position A in the present utility model.

[0020] Figure 5 is the schematic structural view after the nut and the gland are welded in the present utility model.

[0021] Wherein: 1-upper electrode, 2-lower electrode, 3-conductive push rod, 4-locking part, 5-conductive spring, 6-nut, 7-pressure cap, 11-upper mounting groove, 12-slide groove, 13-threaded part, 14-stepped part, 15-contact surface, 16-conical part, 21-lower mounting groove, 31-cylindrical part, 61-conical surface, 71-protrusion, 72-outer edge. Detailed Implementation

[0022] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0023] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0024] like Figure 1 As shown, this utility model provides a resistance welding assembly for cap nuts, including corresponding upper electrode 1 and lower electrode 2. The upper electrode 1 and lower electrode 2 are respectively provided with upper mounting groove 11 and lower mounting groove 21 for mounting workpieces. It also includes a conductive top rod 3, a locking member 4 and a conductive spring 5. The upper electrode 1 is slidably connected to the conductive top rod 3 for increasing the conductive area. The top of the upper electrode 1 is threadedly connected to the locking member 4, and a conductive spring 5 is provided between the locking member 4 and the conductive top rod 3.

[0025] Combination Figure 2 As shown, in this embodiment, the upper electrode 1 is provided with a sliding groove 12 and a threaded portion 13 coaxially distributed with the upper mounting groove 11. The conductive top rod 3 is slidably connected to the sliding groove 12, and the locking member 4 is threadedly connected to the threaded portion 13. The conductive top rod 3 is electrically connected to the upper electrode 1 in sequence through the conductive spring 5 and the locking member 4. The sliding groove 12 is provided with a stepped portion 14, and the conductive top rod 3 is provided with a cylindrical portion 31 corresponding to the stepped portion 14. The conductive top rod 3, the locking member 4, and the conductive spring 5 are all made of phosphor bronze. The upper electrode 1 and the lower electrode 2 are respectively connected to the positive and negative terminals of the power supply. The upper mounting groove 11 is a cylindrical groove for accommodating the pressure cap. The bottom surface of the upper electrode 1 is a contact surface 15, and the lower mounting groove 21 is a conical groove for installing the nut.

[0026] In this embodiment, the ends of the upper electrode 1 and the lower electrode 2 are provided with conical surfaces 16 for centering. The upper electrode 1 and the lower electrode 2 are respectively connected to the positive electrode arm and the negative electrode arm on the resistance welding equipment through the conical surfaces 16, so as to realize the coaxial distribution of the upper electrode 1 and the lower electrode 2, providing a fundamental reference guarantee for the accurate installation and positioning of the nut and the pressure cap.

[0027] Combination Figure 3 ,4 As shown, in the present utility model, the cross-section of the gland 7 is in a shape of a Chinese character "ji" with a convex middle part. The upper electrode member 1 accommodates the convex portion 71 in the middle of the gland 7 through a cylindrical groove and abuts against the outer edge 72 of the gland 7 through its bottom surface. The bottom of the nut 6 is provided with a conical surface 61 adapted to the lower mounting groove 21. When installing the nut 6, automatic centering and positioning of the gland 7 and the nut 6 are achieved, improving the welding precision and being applicable to mass production.

[0028] Combined with Figure 3-5 As shown, the working principle of the present utility model is that the nut 6 is placed in the lower mounting groove of the lower electrode member 2, and the gland is arranged between the nut 6 and the upper electrode member 1. After the upper electrode member 1 and the lower electrode member 2 are pressed together, the bottom surface of the upper electrode member 1 contacts the outer edge of the gland 7, causing the gland 7 and the nut 6 to fit together; at the same time, the conductive ejector rod 3 abuts against the gland 7 and moves upward, compressing the conductive spring 5, so that two conductive paths are established between the upper electrode member 1 and the gland 7: one is that the current directly passes through the bottom surface of the upper electrode member 1 and conducts to the outer edge of the gland 7 in contact with it; the other is that the current sequentially passes through the locking member 4, the conductive spring 5, and the conductive ejector rod 3 and flows to the middle part of the gland 7; this dual-path conductive structure increases the effective current-carrying area between the upper electrode member 1 and the gland 7, making the current evenly distributed on the contact surface 15 between the gland 7 and the nut 6, effectively improving the welding quality and reliability.

[0029] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A resistance welding assembly for cap nuts, comprising corresponding upper electrode (1) and lower electrode (2), wherein the upper electrode (1) and lower electrode (2) are respectively provided with an upper mounting groove (11) and a lower mounting groove (21) for mounting workpieces, characterized in that, It also includes a conductive top rod (3), a locking member (4) and a conductive spring (5). The upper electrode (1) is slidably connected to a conductive top rod (3) for increasing the conductive area. The top of the upper electrode (1) is threadedly connected to a locking member (4), and a conductive spring (5) is provided between the locking member (4) and the conductive top rod (3).

2. The resistance welding assembly for a cap nut according to claim 1, characterized in that: The upper electrode (1) is provided with a sliding groove (12) and a threaded part (13) coaxially distributed with the upper mounting groove (11). The conductive top rod (3) is slidably connected to the sliding groove (12), and the locking part (4) is threadedly connected to the threaded part (13). The conductive top rod (3) is electrically connected to the upper electrode (1) in sequence through the conductive spring (5) and the locking part (4).

3. The resistance welding assembly for a cap nut according to claim 2, characterized in that: The chute (12) is provided with a stepped portion (14), and the conductive top rod (3) is provided with a cylindrical portion (31) corresponding to the stepped portion (14).

4. The resistance welding assembly for a cap nut according to claim 1, characterized in that: The upper mounting groove (11) is a cylindrical groove for accommodating the pressure cap, and the bottom surface of the upper electrode (1) is the contact surface (15).

5. The resistance welding assembly for a cap nut according to claim 1, characterized in that: The lower mounting groove (21) is a conical groove for installing nuts.

6. The resistance welding assembly for a cap nut according to claim 1, characterized in that: The ends of the upper electrode (1) and the lower electrode (2) are provided with conical surfaces (16) for centering.

Images