Projection welding device

Abstract

The invention provides a projection welding device. The projection welding device comprises a projection welding machine, a first electrode tip, a second electrode tip, a positioning pin and a tightening mechanism. The projection welding machine comprises a first electrode arm and a second electrode arm, the first electrode arm is connected with a first electrode tip, the second electrode arm is connected with a second electrode tip, and the tightening mechanism fixes the positioning pin to the second electrode tip; when the nut is welded and the thickness of the metal plate is smaller than the height of the nut positioning step, the part, higher than the metal plate, of the nut positioning step can be avoided, and the nut positioning step is prevented from being crushed by the first electrode tip.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a projection welding apparatus. Background Technology

[0002] In automobile manufacturing, nuts are often fixed to sheet metal parts using projection welding. When the sheet metal thickness is less than the height of the positioning step of the projection-welded nut, the upper electrode tip will directly press against the nut step when welding with a traditional projection welding machine, causing damage to the step, thread breakage, and welding defects. Existing processes usually solve this by reducing the welding current or performing repair welding, but the reliability is insufficient. Another method is to produce special nuts using custom molds or to use sheet metal parts with a thickness exceeding the height of the nut's positioning step, but this is expensive. These problems have long restricted the application of projection welding technology for thin sheet metal and nuts. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the purpose of this invention is to provide a projection welding device.

[0004] To achieve the above-mentioned technical effects, the present invention adopts the following technical solution:

[0005] According to a first aspect of the present invention, a projection welding apparatus is provided, comprising a projection welding machine, a first electrode head, a second electrode head, a positioning pin, and a tightening mechanism; the projection welding machine includes a first electrode arm and a second electrode arm, the first electrode arm being connected to the first electrode head, the second electrode arm being connected to the second electrode head, and the tightening mechanism fixing the positioning pin to the second electrode head;

[0006] The first electrode head has a countersunk hole, which can avoid the part of the nut positioning step that is higher than the sheet metal when welding the nut and the sheet metal thickness is less than the height of the nut positioning step, thus preventing the nut positioning step from being damaged by the first electrode head.

[0007] Preferably, the second electrode head is provided with a mounting hole, and the tightening mechanism fixes the positioning pin to the mounting hole.

[0008] Preferably, the tightening mechanism includes a spring and a tightening nut, and the locating pin is connected to the tightening nut via the spring.

[0009] Preferably, the lower end of the locating pin abuts against the upper end of the spring.

[0010] Preferably, the diameter of the countersunk hole is 0.2mm-0.5mm larger than the diameter of the nut positioning step, and the depth of the countersunk hole is 1mm-2mm greater than the height of the nut positioning step.

[0011] Preferably, the sheet metal is a U-shaped thin sheet metal.

[0012] Compared with the prior art, the projection welding device provided by the present invention has a simple system process structure, low investment and operating costs, and convenient operation and management. It can be widely used in all sheet metal or nuts, especially for nuts with sheet metal thickness less than the height of the nut positioning step, such as U-shaped thin sheet metal, without the need for re-molding. Attached Figure Description

[0013] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is an exploded view of the projection welding device in the embodiment;

[0015] Explanation of reference numerals in the attached figures:

[0016] 1-First electrode head;

[0017] 2-Second electrode head;

[0018] 3-Positioning pin;

[0019] 4. Tighten the nuts;

[0020] 5-Counterhole;

[0021] 6-Spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, all directional indications (such as up, down, left, right, front, back, bottom, etc.) in this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indication will also change accordingly. Furthermore, descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0025] like Figure 1 As shown, this embodiment provides a projection welding device, including a projection welding machine, a first electrode head 1, a second electrode head 2, a positioning pin 3, and a tightening mechanism. The projection welding machine includes a first electrode arm and a second electrode arm. The first electrode arm is connected to the first electrode head 1, and the second electrode arm is connected to the second electrode head 2. The tightening mechanism fixes the positioning pin 3 to the second electrode head 2. Further, the first electrode head 1 has a countersunk hole 5. When welding a nut and the sheet metal thickness is less than the height of the nut positioning step, the countersunk hole avoids the portion of the nut positioning step that protrudes above the sheet metal, preventing the nut positioning step from being damaged by the first electrode head 1. The sheet metal is a U-shaped thin sheet metal.

[0026] Furthermore, the second electrode head 2 is provided with a mounting hole, and the tightening mechanism fixes the positioning pin 3 in the mounting hole, which can improve the heat dissipation effect of the second electrode head 2 and reduce the wear of the positioning pin 3.

[0027] Furthermore, the tightening mechanism includes a spring 6 and a tightening nut 4, with the locating pin 3 connected to the tightening nut 4 via the spring 6.

[0028] Furthermore, the lower end of the locating pin 3 abuts against the upper end of the spring 6 to maintain the stable positioning of the nut during the welding process.

[0029] Furthermore, the diameter of the countersunk hole 5 of the first electrode head 1 is 0.2mm-0.5mm larger than the diameter of the nut positioning step, and the depth of the countersunk hole 5 is 1mm-2mm greater than the height of the nut positioning step, so as to avoid contact with the nut positioning step.

[0030] The projection welding device provided in this embodiment, by creating a countersunk hole in the upper electrode head, avoids the portion of the nut positioning step that protrudes above the sheet metal, thus preventing the nut positioning step from being damaged by the upper electrode head. This projection welding device avoids the problems of re-molding and increasing the sheet metal thickness, resulting in extremely high economic benefits. In the context of the automotive industry's trend towards lightweighting, it pioneers the projection welding of nuts onto thin sheet metal, particularly U-shaped thin plates and nuts, which has broad social impact.

[0031] The specific embodiments of the present invention have been described above. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A projection welding device, characterized in that, The system includes a projection welding machine, a first electrode head, a second electrode head, a positioning pin, and a tightening mechanism. The projection welding machine includes a first electrode arm and a second electrode arm, the first electrode arm being connected to the first electrode head, the second electrode arm being connected to the second electrode head, and the tightening mechanism fixing the positioning pin to the second electrode head. The first electrode head has a countersunk hole, which can avoid the part of the nut positioning step that is higher than the sheet metal when welding the nut and the sheet metal thickness is less than the height of the nut positioning step, thus preventing the nut positioning step from being damaged by the first electrode head.

2. The projection welding apparatus according to claim 1, characterized in that, The second electrode head is provided with a mounting hole, and the tightening mechanism fixes the positioning pin to the mounting hole.

3. The projection welding apparatus according to claim 1, characterized in that, The tightening mechanism includes a spring and a tightening nut, and the locating pin is connected to the tightening nut via the spring.

4. The projection welding apparatus according to claim 3, characterized in that, The lower end of the locating pin abuts against the upper end of the spring.

5. The projection welding apparatus according to claim 1, characterized in that, The diameter of the countersunk hole is 0.2mm-0.5mm larger than the diameter of the nut positioning step, and the depth of the countersunk hole is 1mm-2mm greater than the height of the nut positioning step.

6. The projection welding apparatus according to claim 1, characterized in that, The sheet metal is a U-shaped thin sheet metal.

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