Projection welding device for nut plate and plate electrode

Abstract

The utility model discloses a projection welding device for a nut plate and a plate electrode, which belongs to the technical field of projection welding electrodes, and comprises a nut electrode holder and a nut electrode cover, and a conical compression spring and a KCF positioning pin are arranged in the nut electrode holder and the nut electrode cover. According to the utility model, through differentiated electrode structure design, one side of a thinner welding workpiece is contacted by a smaller electrode, and one side of a thicker welding workpiece is contacted by a larger electrode, so that current can be concentrated on the thin plate side as required, accurate deviation of nuggets is realized, the welding precision is improved, and the production efficiency is improved. Meanwhile, the depth of fusion and nugget at the projection welding spot of the workpiece are obviously increased due to the increase of the current density and the concentration of heat, and the welding strength and reliability are enhanced; the electrode material is changed on the basis of changing the electrode structure, and the beryllium copper electrode with larger resistance is adopted on one side of the thin plate, so that the welding heat on the side of the thin plate is increased.

Description

Technical Field

[0001] This utility model relates to the field of projection welding electrode technology, and in particular to a projection welding device for nut plate and plate electrode. Background Technology

[0002] In industrial production, it is often necessary to connect nut plates and plate electrodes together by projection welding. Traditional projection welding processes typically use a standard welding electrode structure, which is generally a cylindrical design with flat or simple spherical ends. For example, on some conventional automotive parts production lines, when projection welding is performed on materials with relatively uniform thickness, this standard electrode can basically meet the production requirements. Its working principle is based on the current being conducted through the electrode to the contact area of ​​the workpiece, using resistance heat to locally melt the material and form a weld nugget, thereby achieving welding. However, in actual production processes, when encountering situations where the thickness of the nut plate and plate electrode is inconsistent, this type of standard electrode is still used for welding operations.

[0003] The existing welding electrode structure cannot weld materials of different thicknesses. When the welding electrode performs projection welding on the nut plate and the plate electrode, the heat cannot be evenly transferred to the thicker side due to the difference in thickness. This results in the weld nugget not reaching the required penetration depth of 0.2 mm, which easily leads to frequent welding defects such as incomplete welds and weld failures. This increases the product defect rate, reduces the strength and reliability of the welded joint, increases production costs, and also makes subsequent quality inspection difficult.

[0004] Therefore, there is an urgent need to provide a projection welding device for the nut plate and the plate pole to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a projection welding device for nut plate and plate pole.

[0006] To solve the above-mentioned technical problems, the present invention provides a projection welding device for a nut plate and a plate electrode, comprising a nut electrode seat and a nut electrode cover, wherein a conical compression spring and a KCF positioning pin are provided inside the nut electrode seat and the nut electrode cover.

[0007] Through the above technical solution, the KCF positioning pin can realize the positioning of the nut electrode seat and the nut electrode cover, and can accurately restrict the positional freedom of the nut electrode cover. The conical compression spring, as a buffer device, effectively reduces the impact and wear between the electrode and the workpiece, and interacts with the KCF positioning pin to ensure the buffering effect without affecting the positioning accuracy.

[0008] The present invention is further configured such that: one side of the nut electrode seat is provided with an electrode seat screw hole, and the inner bottom wall of the nut electrode seat is provided with a spring mounting groove.

[0009] Through the above technical solution, the electrode seat screw hole is used to install connecting components such as bolts, and the spring mounting groove is used to accommodate the spring, so that the spring can be stably installed in the designated position, providing a basis for subsequent buffering effect.

[0010] The present invention is further configured such that: a thick plate electrode is fixed on one side of the top end of the nut electrode cover, and a thin plate electrode is fixed on the other side of the top end of the nut electrode cover.

[0011] The above technical solution meets the welding requirements of plates of different thicknesses through differentiated electrode structures. Furthermore, by changing the electrode material based on the electrode structure, a beryllium copper electrode with higher resistance is used on the thin plate side to increase the welding heat on the thin plate side, thereby enhancing the welding strength and reliability.

[0012] The present invention is further configured such that: the bottom end of the nut electrode cover is fixed with a threaded end, and the outside of the threaded end is connected to the inside thread of the nut electrode seat.

[0013] The above technical solution enables a tight fit and quick assembly / disassembly between the threaded end and the nut electrode holder.

[0014] The present invention is further configured such that: one side of the threaded end is provided with an electrode cover screw hole, and a fixing bolt with one end penetrating through and extending into the electrode cover screw hole is threaded on the outer side of the electrode seat screw hole.

[0015] Through the above technical solution, the fixing bolt can firmly fix the nut electrode cover to the nut electrode seat.

[0016] The present invention is further configured such that: the inside of the nut electrode cover is provided with a positioning pin hole, and a KCF positioning pin is nested inside the positioning pin hole.

[0017] Through the above technical solution, KCF locating pins are used for insulation protection during the welding of bolts and nuts.

[0018] The present invention is further configured such that a conical compression spring is fitted between the inside of the spring mounting groove and one end of the KCF positioning pin.

[0019] Through the above technical solution, the conical compression spring can play a buffering role, reduce impact and vibration, and protect the electrode and workpiece surface from damage.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. This utility model uses a differentiated electrode structure design, employing a smaller electrode contact on the thinner side of the welded workpiece and a larger electrode contact on the thicker side of the welded workpiece. This allows the current to be concentrated on the thinner side as needed, achieving precise offset of the weld nugget and improving welding accuracy. At the same time, the increase in current density and the concentration of heat significantly increase the penetration depth and weld nugget at the projection weld point of the workpiece, enhancing welding strength and reliability.

[0022] 2. This utility model changes the electrode material based on the modified electrode structure. A beryllium copper electrode with higher resistance is used on the thin plate side to increase the welding heat on the thin plate side. At the same time, hard-mode welding is adopted. Since the hard-mode welding has a short energizing time, the current density at the welding point is high, and the heat loss is relatively reduced. This ensures that there is enough heat on the thin plate side to form a stable weld nugget, while avoiding overheating on the thick plate side. This improves the welding quality, reduces the rework rate caused by welding defects, and thus improves the overall production efficiency. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is an exploded structural diagram of the present invention;

[0025] Figure 3 This is a structural diagram of the nut electrode holder of this utility model;

[0026] Figure 4 This is a structural diagram of the nut electrode cover of this utility model.

[0027] In the figure: 1. Nut electrode holder; 101. Electrode holder screw hole; 102. Spring mounting groove; 103. Fixing bolt; 2. Nut electrode cover; 201. Thick plate electrode; 202. Thin plate electrode; 203. Threaded end; 204. Electrode cover screw hole; 205. Locating pin hole; 3. Conical compression spring; 4. KCF locating pin. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0029] Please see Figures 1-4A projection welding device for a nut plate and a plate electrode includes a nut electrode holder 1 and a nut electrode cover 2. The nut electrode holder 1 and the nut electrode cover 2 are internally equipped with a conical compression spring 3 and a KCF positioning pin 4. The nut electrode holder 1 has an electrode holder screw hole 101 on one side and a spring mounting groove 102 on the inner bottom wall. A thick plate electrode 201 is fixed to one side of the top of the nut electrode cover 2, and a thin plate electrode 202 is fixed to the other side of the top of the nut electrode cover 2. Through differentiated electrode structure design, the thinner side of the welding workpiece is contacted by the thin plate electrode 202, and the thicker side of the welding workpiece is contacted by the thick plate electrode 201. This allows the current to be concentrated on the thin plate electrode 202 as needed, achieving precise offset of the weld nugget and improving welding accuracy. Simultaneously, the increased current density and concentrated heat significantly increase the penetration depth and weld nugget at the projection weld point, enhancing welding strength and reliability.

[0030] like Figures 2-4 As shown, the bottom end of the nut electrode cover 2 is fixed with a threaded end 203. The outside of the threaded end 203 is connected to the inside of the nut electrode seat 1 by a thread. One side of the threaded end 203 is provided with an electrode cover screw hole 204. A fixing bolt 103 with one end penetrating and extending into the inside of the electrode cover screw hole 204 is installed on the outside of the electrode seat screw hole 101. The inside of the nut electrode cover 2 is provided with a positioning pin hole 205. A KCF positioning pin 4 is nested inside the positioning pin hole 205. A conical compression spring 3 is fitted between the inside of the spring mounting groove 102 and one end of the KCF positioning pin 4. By changing the electrode material based on the change of electrode structure, the thin plate electrode 202 adopts a beryllium copper electrode with higher resistance, which increases the welding heat on the thin plate side. At the same time, hard specification welding is adopted. Since the hard specification energizing time is short, the current density at the welding point is high, and the heat loss is relatively reduced. This can ensure that there is enough heat on the thin plate electrode 202 side to form a stable weld nugget, and can also avoid overheating on the thick plate electrode 201 side, thereby improving the welding quality, reducing the rework rate caused by welding defects, and thus improving the overall production efficiency.

[0031] In use, the conical compression spring 3 is first placed in the spring mounting groove 102 of the nut electrode holder 1. Then, the KCF locating pin 4 is inserted into the locating pin hole 205 of the nut electrode cover 2. Next, the nut electrode cover 2, which has a thick plate electrode 201 and a thin plate electrode 202, is threadedly connected to the nut electrode holder 1 through the threaded end 203. Then, the fixing bolt 103 is passed through the screw hole 101 of the electrode holder and extends into the screw hole 204 of the electrode cover. The fixing bolt 103 is tightened to firmly fix the nut electrode cover 2 onto the nut electrode holder 1.

[0032] Working Principle: During projection welding of the nut plate and the plate electrode, the workpiece to be welded is placed in a suitable position so that the electrode contacts the workpiece. Due to the use of a differentiated electrode structure, the thinner side of the workpiece is contacted by the thin plate electrode 202, and the thicker side is contacted by the thicker plate electrode 201. Because the current is concentrated on the corresponding side according to the thickness of the plate, the current can be concentrated on the thin plate electrode 202 as required, achieving precise offset of the weld nugget and improving welding accuracy. At the same time, the increase in current density and the concentration of heat make the projection weld of the workpiece... The penetration depth and weld nugget at the weld point are significantly increased, enhancing welding strength and reliability. At the same time, the electrode material is changed based on the modified electrode structure. The thin plate electrode 202 adopts a beryllium copper electrode with higher resistance, which increases the welding heat on the thin plate side. Hard specification welding is adopted. Due to the short energizing time of hard specification, the current density at the weld point is high, and the heat loss is relatively reduced. This ensures that there is enough heat on the thin plate electrode 202 side to form a stable weld nugget, while avoiding overheating on the thick plate electrode 201 side. This reduces the rework rate caused by welding defects, thereby achieving stable welding of plates of different thicknesses.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A projection welding device for nut plate and plate pole, comprising a nut electrode seat (1) and a nut electrode cover (2), characterized in that: The nut electrode seat (1) and nut electrode cover (2) are internally provided with conical compression springs (3) and KCF positioning pins (4).

2. A projection welding apparatus for welding nuts to sheet metal poles according to claim 1, characterized in that: One side of the nut electrode seat (1) is provided with an electrode seat screw hole (101), and the inner bottom wall of the nut electrode seat (1) is provided with a spring mounting groove (102).

3. A projection welding apparatus for welding nuts to sheet metal poles according to claim 1, characterized in that: The top end of the nut electrode cover (2) is fixed with a thick plate electrode (201) on one side, and the top end of the nut electrode cover (2) is fixed with a thin plate electrode (202) on the other side.

4. A device for projection welding of nut plates to plate poles according to claim 2, characterized in that: The bottom end of the nut electrode cover (2) is fixed with a threaded end (203), and the outer part of the threaded end (203) is threadedly connected with the inner part of the nut electrode seat (1).

5. A device for projection welding of nut plates to plate poles according to claim 4, characterized in that: One side of the threaded end (203) is provided with an electrode cover screw hole (204), and the outer side of the electrode seat screw hole (101) is threadedly mounted with a fixed bolt (103) which penetrates through one end and extends to the inside of the electrode cover screw hole (204).

6. A device for projection welding of nut plates to plate poles according to claim 2, characterized in that: The inside of the nut electrode cover (2) is provided with a positioning pin hole (205), and the inside of the positioning pin hole (205) is nested with a KCF positioning pin (4).

7. A device for projection welding of nut plates to plate poles according to claim 6, characterized in that: The inside of the spring mounting groove (102) is fitted with a conical compression spring (3) between one end of the KCF positioning pin (4).

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