Welding stud for new energy automobile and mounting and fixing method and device

Abstract

The invention discloses a welding stud for a new energy automobile and an installing and fixing method and device.The welding stud comprises a stud body and a stud head, the stud body is located below the stud head, the stud body is an external thread column, the welding stud needs to be pre-installed on a plate of the new energy automobile, material pressing teeth are arranged on the peripheral face of the bottom end of the stud head, and the material pressing teeth are matched with the stud head. The material pressing teeth consist of a plurality of saw teeth which are continuously and adjacently distributed on the peripheral surface; a feeding groove is formed in the position, making contact with the nail body, of the bottom of the nail head. The feeding groove and the pressing teeth are embedded into the plate through a stamping process so as to fix the welding stud on the plate; the plate is welded to the top of the nail head through a welding process. The tensile strength and the positioning stability of the welding stud on the plate can be improved, and the risk that the welding stud falls off is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of welding nails for new energy vehicles, and in particular to a welding nail, an installation and fixing method and a device for a new energy vehicle. Background Art

[0002] Stud welding is a special welding process that efficiently, cheaply and fully fuses studs or columnar metals with a diameter of 2 to 25 mm to the metal surface. The application of this technology can replace some traditional processing methods, such as drilling, tapping, manual welding, and post-weld treatment. It has a series of advantages such as full-section fusion of the weld, improved safety of the welding part, small heat-affected zone, small deformation of the welding base material, small welding damage, no or very small welding damage on the back of the base material, and maintaining the airtightness of hollow parts. The welding nail generally consists of a nail body and an arc-starting part (nail head). Some of them also have threads or various connecting lines, or a hollow structure of the welding nail, etc. The cylindrical head welding nail is the most common. In the production of automobile underbody guards and other steel stamping parts at the bottom of the automobile, the welding nail process is used more frequently.

[0003] The welding principle of the existing T5 specification welding nails on the market is: at the point where welding is required, the welding nail is automatically raised to the distance between the base material and the arc is ignited. The arc heat melts the head of the welding nail and the surface of the base material to form a molten pool. After the arc is extinguished, the spring pressure of the welding nail is used to press the melted end of the welding nail into the molten pool. After the molten pool solidifies, the welding process is completed. This welding method needs to consider how to position the welding nail and weld it accurately at the specified position. Since the welding work is only completed on the surface of the base material, the welding nail is only bonded to the surface of the base material, and there is a risk of falling off due to impact. In particular, the nail welding process is used on the bottom structural parts of the automobile. The base material is often galvanized steel plate. The galvanized layer makes the nail welding more difficult. If the welding nail falls off during assembly, it will greatly affect the production rhythm, affect the connection strength of related structural parts, cause the corresponding parts to loosen, and affect the driving of the car. The risk of welding nail falling off needs to be avoided as much as possible. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a welding nail, installation and fixing method and device for new energy vehicles, which can.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a welding nail for new energy vehicles, comprising a nail body and a nail head, wherein the nail body is located below the nail head, and the nail body is an external threaded column. The plate of the new energy vehicle needs to be pre-installed with the welding nail.

[0006] A material pressing tooth is provided on the outer peripheral surface of the bottom end of the nail head, and the material pressing tooth is composed of a plurality of saw teeth continuously and adjacently distributed on the outer peripheral surface;

[0007] A feeding groove is provided at the position where the bottom of the nail head contacts the nail body;

[0008] The feeding groove and the pressing teeth are embedded in the plate through a stamping process to fix the welding nail on the plate; the top of the nail head is welded to the plate through a welding process.

[0009] As an optional embodiment, in the first aspect of the present invention, the thickness of the outer peripheral surface provided with the pressing teeth is 0.1 to 1.5 mm.

[0010] As another optional embodiment, in the first aspect of the present invention, the width of the feeding groove is 0.1-1 mm.

[0011] As another optional implementation, in the first aspect of the present invention, the thickness of the nail head is 1 to 2 mm.

[0012] As another optional embodiment, in the first aspect of the present invention, the pressing teeth are formed by sequentially opening a plurality of grooves along the circumferential direction on the outer peripheral surface of the bottom end of the nail head, and each groove is located between two adjacent saw teeth.

[0013] As another optional embodiment, in the first aspect of the present invention, the sharp corners of the saw teeth face away from the axis of the welding stud.

[0014] As another optional implementation, in the first aspect of the present invention, the sharp angle of the sawtooth is 30 to 150 degrees.

[0015] As another optional embodiment, in the first aspect of the present invention, a straight section with a height of 0.7-0.9 mm is further provided on the top of the nail body, and the bottom of the straight section is connected to the external threaded portion of the nail body.

[0016] The second aspect of the present invention discloses a method for installing and fixing a welding nail, wherein the welding nail is the welding nail described in the first aspect of the present invention, and the method is used to install and fix the welding nail on the plate of the new energy vehicle, and the method comprises:

[0017] S1. Stamping process: determine the position of the welding nail on the plate, embed the feeding groove and the pressing teeth of the welding nail into the plate at this position through the stamping equipment, and make the top of the nail head pass through the plate;

[0018] S2. Welding process: welding the top of the nail head to the surface of the plate by using a nail welding device.

[0019] The third aspect of the present invention discloses a device for installing and fixing welding studs, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps in the method disclosed in the second aspect of the present invention.

[0020] A fourth aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the method disclosed in the second aspect of the present invention.

[0021] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0022] Compared with the prior art, the embodiment of the present invention adopts a pressing tooth structure: continuous serrations form the cutting edge surface, which produces a progressive bite effect during stamping, so that the sheet material produces plastic flow to fill the feeding groove and form a mechanical interlocking structure; a double fixing mechanism: stamping riveting and top welding form a composite fixation, and the metallurgical bonding and mechanical bite produced by welding work synergistically to improve the tensile strength (compared with single welding); a pre-positioning function: the stamping and embedding process ensures the verticality of the welding studs to avoid the deflection problem caused by subsequent welding thermal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a welding stud for new energy vehicles disclosed in an embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional bottom view of a welding stud for new energy vehicles disclosed in an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of a flow chart of a method for installing and fixing a welding stud disclosed in an embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a welding stud installation and fixing device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] See also Figures 1-2 The embodiment of the present invention discloses a welding nail for new energy vehicles, comprising a nail body 1 and a nail head 2, wherein the nail body 1 is located below the nail head 2, the nail body 1 is an external threaded column, and the plate 3 of the new energy vehicle needs to be pre-installed with the welding nail, wherein:

[0031] A pressing tooth 21 is provided on the outer peripheral surface of the bottom end of the nail head 2, and the pressing tooth 21 is composed of a plurality of saw teeth 211 continuously and adjacently distributed on the outer peripheral surface; a feeding groove 22 is provided at the position where the bottom of the nail head 2 contacts the nail body 1; the feeding groove 22 and the pressing tooth 21 are embedded in the plate 3 through a stamping process to fix the welding nail on the plate 3; the top 23 of the nail head 2 is welded to the plate 3 through a welding process.

[0032] The embodiment of the present invention adopts the structure of the pressing teeth 21: the continuous serrations 211 form the cutting edge surface, and a progressive bite effect is produced during stamping, so that the material of the plate 3 produces plastic flow to fill the feeding groove 22, forming a mechanical interlocking structure; a double fixing mechanism: stamping riveting and top welding form a composite fixation, and the metallurgical bonding and mechanical bite produced by welding work synergistically to improve the tensile strength (compared with single welding); a pre-positioning function: the stamping and embedding process ensures the verticality of the welding nail, avoiding the deflection problem caused by subsequent welding thermal deformation.

[0033] In another optional embodiment, the thickness of the outer circumference of the pressing teeth 21 is 0.1-1.5 mm. The thickness is the thickness of the pressing teeth 21 measured in the length direction (or axial direction) of the welding nail. By limiting the thickness of the outer circumference of the pressing teeth 21 to 0.1-1.5 mm, a hardness gradient is formed with the hardened carbon steel substrate, and the plastic deformation of the sheet 3 is accurately controlled during the stamping process, so that the bite depth is stabilized within a certain range, avoiding tooth fracture or bite failure caused by too brittle or too soft materials.

[0034] In another optional embodiment, the width of the feeding groove 22 is 0.1-1 mm. The feeding groove 22 width of 0.1-1 mm optimizes the flow path of the sheet material 3, increases the metal filling rate during stamping, and improves the tensile strength of the mechanical interlocking structure.

[0035] In another optional embodiment, the nail head 2 has a thickness of 1-2 mm. The thickness of the nail head is the sum of the thickness of the top 23 and the pressing teeth 21 .

[0036] In yet another optional embodiment, the pressing teeth 21 are formed by sequentially opening a plurality of grooves 24 along the circumferential direction on the outer circumferential surface of the bottom end of the nail head 2 , and each groove is located between two adjacent saw teeth 211 .

[0037] In yet another optional embodiment, the sharp corner 2111 of the sawtooth 211 faces away from the axis of the welding stud.

[0038] In another optional embodiment, the sharp angle of the sawtooth 211 is 30 to 150 degrees. The sharp angle of the sawtooth is adapted to different stamping speeds: when the angle is close to 30 degrees, it is suitable for high-speed stamping to improve material shearing efficiency; when the angle is close to 150 degrees, it is suitable for low-speed precision stamping to increase the contact area of ​​the occlusal surface and enhance process compatibility.

[0039] In yet another optional embodiment, a straight section 11 with a height of 0.7-0.9 mm is further provided on the top of the nail body 1 , and the bottom of the straight section is connected to the external threaded portion 12 of the nail body 1 .

[0040] In yet another optional embodiment, the welding stud is made of hardened carbon steel.

[0041] In yet another optional embodiment, the pitch of the external thread of the nail body 1 is 1.5-1.7 mm.

[0042] In yet another optional embodiment, the surface of the welding stud is provided with an anti-rust coating.

[0043] Embodiment 2

[0044] See also Figure 3 The embodiment of the present invention discloses a method for installing and fixing a welding nail, wherein the welding nail is the welding nail described in the first embodiment, and the method is used to install and fix the welding nail on the plate of the new energy vehicle, and the method includes:

[0045] S1. Stamping process: determine the position of the welding nail on the plate, embed the feeding groove and the pressing teeth of the welding nail into the plate at this position through the stamping equipment, and make the top of the nail head pass through the plate;

[0046] S2. Welding process: welding the top of the nail head to the surface of the plate by using a nail welding device.

[0047] In the embodiment of the present invention, the step-by-step process of stamping first and then welding enables independent optimization of process parameters (stamping force, welding current, etc.), and the yield rate can be improved; one side of the welding nail is riveted and the other side is welded, so as to greatly avoid the risk of the welding nail being hit by the side thrust and falling off by a double reinforcement method; this scheme only needs to determine the positioning during stamping, and there is no need to consider the positioning problem of the welding nail in the subsequent welding process, and no additional positioning step is added.

[0048] Optionally, the stud welding equipment is a stud implanting machine.

[0049] Embodiment 3

[0050] See also Figure 4 , Figure 4It is a schematic diagram of the structure of a welding stud installation and fixing device disclosed in an embodiment of the present invention, including a memory 101, a processor 102 and a computer program stored in the memory, and the processor executes the computer program to implement the steps in the method disclosed in Example 2.

[0051] Embodiment 4

[0052] An embodiment of the present invention discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the method disclosed in the second embodiment are implemented.

[0053] The contents disclosed in the embodiments of the present invention only disclose the preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding nail for new energy vehicles, comprising a nail body and a nail head, wherein the nail body is located below the nail head, the nail body is an external threaded column, and the plate of the new energy vehicle needs to be pre-installed with the welding nail, characterized in that: A material pressing tooth is provided on the outer peripheral surface of the bottom end of the nail head, and the material pressing tooth is composed of a plurality of saw teeth continuously and adjacently distributed on the outer peripheral surface; A feeding groove is provided at the position where the bottom of the nail head contacts the nail body; The feeding groove and the pressing teeth are embedded in the plate through a stamping process to fix the welding nail on the plate; the top of the nail head is welded to the plate through a welding process.

2. The welding nail according to claim 1, characterized in that The thickness of the outer peripheral surface provided with the pressing teeth is 0.1 to 1.5 mm.

3. The welding nail according to claim 1, characterized in that: The width of the feeding groove is 0.1-1 mm.

4. The welding nail according to claim 1, characterized in that: The thickness of the nail head is 1-2 mm.

5. The welding nail according to claim 1, characterized in that: The pressing teeth are formed by sequentially opening a plurality of grooves on the outer peripheral surface of the bottom end of the nail head along the circumferential direction, and each groove is located between two adjacent saw teeth.

6. The welding nail according to claim 1, characterized in that: The sharp corners of the saw teeth face away from the axis of the welding stud.

7. The welding nail according to claim 1, characterized in that: The sharp angle of the saw teeth is 30 to 150 degrees.

8. The welding nail according to claim 1, characterized in that: A straight section with a height of 0.7-0.9 mm is also provided on the top of the nail body, and the bottom of the straight section is connected to the external threaded portion of the nail body.

9. A method for installing and fixing a welding nail, wherein the welding nail is the welding nail according to any one of claims 1 to 8, and the method is used to install and fix the welding nail on the plate of the new energy vehicle, characterized in that: The method comprises: S1. Stamping process: determine the position of the welding nail on the plate, embed the feeding groove and the pressing teeth of the welding nail into the plate at this position through the stamping equipment, and make the top of the nail head pass through the plate; S2. Welding process: welding the top of the nail head to the surface of the plate by using a nail welding device.

10. A device for installing and fixing welding studs, comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to claim 9.

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