High-strength steel projection welding sealing nut and application thereof

Abstract

The invention belongs to the technical field of nut projection welding, and discloses a high-strength steel projection welding sealing nut and application thereof.The high-strength steel projection welding sealing nut comprises a nut base body provided with an inner threaded hole; the convex ring is arranged at the bottom of the nut base body; the sealing structure is arranged at the joint of the nut base body and the convex ring; and the sealing structure has a high melting point, and a gap between the convex ring and the nut base body is filled in a high-temperature state. The high-strength steel projection welding sealing nut can achieve good welding sealing performance. And compared with a common nut, the high-strength steel projection welding sealing nut is higher in welding adaptability and can adapt to more diversified welding processes.

Description

Technical Field

[0001] The invention belongs to the technical field of nut projection welding, and in particular relates to a high-strength steel projection welding sealing nut with good airtight stability and an application thereof. Background Art

[0002] In new energy electric vehicles, the battery box is a core component of the vehicle, and its sealing directly affects the safe use of the entire vehicle system. The battery box is installed at a low position in the electric vehicle and is easily exposed in a relatively open space. These conditions put forward high requirements for the sealing of the battery box. The insufficient strength of the traditional projection welded nut will result in a loose welding between the nut and the plate.

[0003] In order to solve the above problems, a high-strength steel projection welding sealing nut with good welding sealing performance is urgently needed. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a high-strength steel projection welding sealing nut and its application.

[0005] In order to achieve the purpose of solving the above problems, as a first aspect, the technical solution adopted by the present invention is to provide a high-strength steel projection welding sealing nut, comprising:

[0006] It includes a nut base having an internal threaded hole;

[0007] A convex ring, arranged at the bottom of the nut base;

[0008] The sealing structure is arranged at the connection between the nut base and the convex ring; the sealing structure has a high melting point and fills the gap between the convex ring and the nut base under high temperature.

[0009] According to the present invention, further, the annular groove at the bottom of the nut base, the sealing structure is embedded in the annular groove.

[0010] According to the present invention, further, the convex ring has a certain height and its diameter is greater than the diameter of the annular groove.

[0011] According to the present invention, further, the sealing structure is a gasket.

[0012] According to the present invention, further, the sealing structure is made of polytetrafluoroethylene.

[0013] As a second aspect, the present invention also provides an application of a high-strength steel projection welding sealing nut, comprising:

[0014] The bottom of the convex ring contacts the surface of the workpiece;

[0015] A powered electrode is connected to the nut base;

[0016] By energizing the powered electrodes, the high-strength steel projection welding sealing nut and the workpiece are welded into an integrated structure.

[0017] Furthermore, an upper electrode is connected to the outer periphery of the nut base, and a lower electrode is connected to the bottom of the nut base. The lower electrode is located below the workpiece. The fixing component connects one end to the nut base and the other end passes through the convex ring and the workpiece in sequence and then connects to the lower electrode, so that the workpiece and the nut fit tightly.

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

[0019] The high-strength steel projection welding sealing nut of the present invention can achieve better welding sealing performance. Compared with ordinary nuts, the high-strength steel projection welding sealing nut has stronger welding adaptability and can be adapted to more diverse welding processes.

[0020] The high-strength steel projection welding sealing nut can achieve a higher weld quality through reasonable adjustment parameters and appropriate process selection. The nut projection welding quality directly affects its later assembly, debugging and the overall performance of the product. The high-strength projection welding sealing nut of the present invention is suitable for new products with high requirements for sealing and welding quality, solves the problem of product weld quality during welding and the problem of product projection welding sealing stability, and improves the qualified rate of welding products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a high-strength steel projection welding sealing nut of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the welding state of a high-strength steel projection-welded sealing nut of the present invention.

[0023] Description of reference numerals:

[0024] 1- nut body, 11- flange, 2- internal threaded hole, 3- annular boss, 31- toothed sealing geometry, 4- flower teeth. DETAILED DESCRIPTION

[0025] In order to make the present invention more clearly understood, a preferred embodiment is described in detail with reference to the accompanying drawings as follows:

[0026] See also Figure 1 and Figure 2, an embodiment of the present application provides a high-strength steel projection welding sealing nut, comprising a nut base 1 with an internal threaded hole 2, an annular groove 3 opened at the bottom of the nut base 1, a gasket 4 embedded in the groove 3, and a convex ring 5 arranged at the bottom of the nut base 1. Among them, the convex ring 5 has a certain height and its diameter is larger than the diameter of the annular groove 3. During use, the convex ring 5 contacts the workpiece 7. In order to improve the stability of the gasket 4 and prevent it from being melted during the welding process, the gasket 4 adopts a polytetrafluoroethylene gasket with a high melting point. The gasket 4 is compressed and deformed during the welding process, filling the gap where the convex ring is not well formed, thereby improving the airtight stability of the sealing projection welding.

[0027] The welding process of the present invention is:

[0028] 1. The wire is fed into a straightening machine and processed into a nut base 1 through a die punching device.

[0029] 2. The processed nut base 1 is passed through a thread processing device to form an internal thread hole 2;

[0030] 3. Processing the polytetrafluoroethylene material into a gasket 4;

[0031] 4. Place the gasket into the annular groove 3.

[0032] 5. Weld a fixed convex ring 5 at the bottom of the nut base 1.

[0033] The working principle of the present invention is as follows: during the welding process with the workpiece, the bottom of the convex ring 5 contacts the surface of the workpiece 7, the outer periphery of the nut base 1 is connected to the upper electrode 6, the lower part of the nut base 1 is connected to the lower electrode 9, and the lower electrode 9 is located below the workpiece 7. One end of the positioning pin 8 is connected to the internal threaded hole 2, and the other end passes through the convex ring 5 and the workpiece 7 in sequence and then connects to the lower electrode 9, so that the workpiece and the nut fit tightly; then the welding current is connected to weld the high-strength projection welding sealing nut to the workpiece 7. In a high-temperature environment, the washer 4 prevents the melting splash of the convex ring 5 from damaging the threads of the internal threaded hole 2. At the same time, the washer 4 made of high-melting-point polytetrafluoroethylene is compressed and deformed during the welding process, filling the gaps in the poorly formed parts of the convex ring 5, thereby improving the airtight stability of the sealing projection welding. The area of ​​the convex ring is much larger than that of the convex point, and the plate may have surface defects, differences in the follow-up and uniformity of the welding machine electrode, nut and plate coating and other problems will lead to poor stability of the sealed projection welding. Under reasonable welding process parameters, due to the fast melting speed of the projection welding and the fast water cooling speed of the electrode, less heat is transferred to the polytetrafluoroethylene gasket, the polytetrafluoroethylene gasket will not melt and thermally deform, and the stability of the sealed projection welding is further guaranteed.

[0034] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-strength steel projection welding sealing nut, characterized in that: include, It includes a nut base having an internal threaded hole; A convex ring, arranged at the bottom of the nut base; The sealing structure is arranged at the connection between the nut base and the convex ring; the sealing structure has a high melting point and fills the gap between the convex ring and the nut base under high temperature.

2. A high-strength steel projection welding sealing nut as claimed in claim 1, characterized in that: The annular groove is formed at the bottom of the nut base, and the sealing structure is embedded in the annular groove.

3. A high-strength steel projection welding sealing nut as claimed in claim 2, characterized in that: The convex ring has a certain height and a diameter greater than the diameter of the annular groove.

4. A high-strength steel projection welding sealing nut as claimed in claim 1, characterized in that: The sealing structure is a gasket.

5. A high-strength steel projection welding sealing nut as claimed in claim 1 or 4, characterized in that: The sealing structure is made of polytetrafluoroethylene.

6. An application of the high-strength steel projection welding sealing nut as claimed in any one of claims 1 to 5, characterized in that: include, The bottom of the convex ring contacts the surface of the workpiece; A powered electrode is connected to the nut base; By energizing the powered electrodes, the high-strength steel projection welding sealing nut and the workpiece are welded into an integrated structure.

7. The use of the high-strength steel projection welding sealing nut as claimed in claim 6, characterized in that: The outer periphery of the nut base is connected to an upper electrode, and the lower part of the nut base is connected to a lower electrode, which is located below the workpiece. The fixing component connects one end to the nut base, and the other end passes through the convex ring and the workpiece in sequence and then connects to the lower electrode, so that the workpiece and the nut fit tightly.

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