Fastener for spot welding

Abstract

The utility model discloses a fastener for spot welding. The fastener is used for connecting an upper-layer plate and a lower-layer plate. The fastening piece comprises a flange part, a fastening part and a fixing part, and the flange part extends in the axial direction; the rod part extends in the axial direction, and the diameter of the flange part in the axial direction is larger than that of the rod part in the axial direction; the flange part is provided with a first end facing the rod part and a second end deviating from the rod part, the first end of the flange part is provided with an inclined surface, and the inclined surface gradually inclines inwards from the first end of the flange part to the second end of the flange part; the inclined face is used for forming a first material containing area, and when the fastener conducts stamping on the upper layer plate, the first material containing area is used for containing the part, guided by the flange part, of the upper layer plate. By means of the structure, the inclined face on one side of the flange part can be used for guiding materials to flow in the stamping process, and higher fixing strength is achieved.

Description

Technical Field

[0001] The utility model relates to a spot welding technology, in particular to a fastener used for spot welding. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] Resistance spot welding is a common welding technology used to connect two metal workpieces together. It is generally used in assembly lines such as automobiles, fans and trains. Resistance spot welding applies high voltage between the contact surfaces of two metal workpieces and passes a large current, using the heat generated by the contact resistance to melt or reach a plastic state, thereby forming a weld. After the power is turned off, the weld becomes firm under the continued pressure, connecting the metal workpieces together. The above process usually includes stages such as pre-pressing, welding, maintenance and rest.

[0004] In existing mass production, fasteners are usually stamped and fixed on one of the plates, and then one end of the other fastener is abutted against the surface of the other plate, and one electrode is connected to the fastener and the other electrode is connected to the other plate, and then the electrodes are energized for spot welding. When the fasteners are stamped and fixed on the plates, the interference fit between the fasteners and the plates is difficult to meet the fixing strength requirements because some plates are too thin or too thick. The fasteners after stamping are not firmly engaged with the plates, resulting in the fasteners being separated from the plates during later spot welding or use, causing the upper and lower plates to be misaligned or even separated, affecting the overall structure.

[0005] There is currently no fastener for spot welding that can solve the above problems. Utility Model Content

[0006] The utility model aims to provide a fastener for spot welding, which can guide the flow of materials during stamping through the inclined surface on one side of the flange part and has higher fixing strength.

[0007] In order to achieve the above purpose, the upper plate and the lower plate are connected; wherein the fastener comprises:

[0008] A flange portion extending in the axial direction;

[0009] A rod portion, the rod portion extending along the axial direction, the diameter of the flange portion along the axial direction being greater than the diameter of the rod portion along the axial direction;

[0010] The flange portion has a first end facing the stem portion and a second end facing away from the stem portion,

[0011] The first end of the flange portion has an inclined surface, and the inclined surface gradually inclines inward from the first end of the flange portion toward the second end;

[0012] The inclined surface is used to form a first accommodating area, and when the fastener punches the upper plate, the first accommodating area is used to accommodate a portion of the upper plate guided by the flange portion.

[0013] Furthermore, an angle between a side wall surface of the flange portion facing the rod portion and a radial direction is 5 degrees.

[0014] Furthermore, the outer wall of the rod portion has a first surface at a connection position between the rod portion and a wall surface of one side of the flange portion facing the rod portion, and the first surface is inclined toward the axial direction from the flange portion to the rod portion.

[0015] Furthermore, an included angle between the first surface and the axial direction is between 30 degrees and 60 degrees.

[0016] Furthermore, the outer wall of the rod portion has a second surface on a side connected to the first surface and away from the flange portion, and the second surface is inclined toward the axial direction from the rod portion to the flange portion.

[0017] Furthermore, the second surface has a second material accommodating area on a side away from the rod portion in the radial direction, and when the fastener punches the upper plate, the material of the upper plate is guided to the second material accommodating area by the flange portion.

[0018] Furthermore, an included angle between the second surface and the axial direction is between 1 degree and 10 degrees.

[0019] Furthermore, the outer wall of the rod portion includes circumferentially arranged flower teeth, so that when the fastener punches the upper plate, the material of the upper plate enters the flower teeth.

[0020] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0021] 1. The fastener for spot welding of the utility model can be provided with an inclined surface on one side of the flange portion from the edge position of the flange portion to the axial direction away from the rod portion. During the stamping process of the fastener for spot welding on the upper plate, the material of the upper plate is limited by the inclined surface and guided to flow to the first material storage area on the side of the inclined surface axially toward the rod portion, so that there is a certain amount of material between the flange portion and the rod portion in the radial direction, so that the fastener for spot welding of the utility model can withstand a large amount of external force from the radial direction after welding, and the fixation is better and more stable.

[0022] 2. The fastener for spot welding of the utility model has a first surface arranged between the rod portion and the flange portion, so that the fastener for spot welding has a larger contact area with the upper plate, thereby enhancing the sealing effect on both sides of the upper plate.

[0023] 3. The fastener for spot welding of the utility model is provided with a second surface connected to the first surface on one side of the rod portion, and the second surface is inclined toward the axial direction from the rod to the flange portion, so that when the fastener for spot welding is stamping the upper plate, the material of the upper plate is guided by the flange portion to the second material holding area on the side of the second surface, so that along the axial direction, one side of the rod portion has a certain amount of material, so that the fastener for spot welding of the utility model can withstand a large amount of external force from the axial direction after welding, and the fixation is better and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic cross-sectional view of a fastener for spot welding provided in an embodiment of this specification during spot welding;

[0026] Figure 2 is a cross-sectional schematic diagram of a fastener for spot welding provided in an embodiment of this specification;

[0027] Figure 3 It is a three-dimensional schematic diagram of a fastener for spot welding provided in an embodiment of this specification;

[0028] Figure 4 It is a schematic diagram of an embodiment of a fastener with flower teeth for spot welding provided in an embodiment of this specification;

[0029] In the figure: 100, upper plate; 200, lower plate; 200a, third surface; 1, fastener; 11, flange; 111, inclined surface; 1111, first material storage area; 12, rod; 121, first surface; 122, second surface; 1221, second material storage area; 126, tooth; 1a, first surface; 1b, second surface; 2, upper electrode; 3, lower electrode. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0031] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0032] See also Figure 1-3 , is a fastener for spot welding in this embodiment, used to connect the upper plate 100 and the lower plate 200; wherein the fastener 1 includes:

[0033] A flange portion 11 extending in the axial direction;

[0034] The rod portion 12 extends in the axial direction, and the diameter of the flange portion 11 in the axial direction is greater than the diameter of the rod portion 12 in the axial direction;

[0035] The flange portion 11 has a first end facing the rod portion 12 and a second end facing away from the rod portion 12.

[0036] The first end of the flange portion 11 has an inclined surface 111, and the inclined surface 111 gradually inclines inward from the first end of the flange portion 11 toward the second end;

[0037] The inclined surface 111 is used to form a first accommodating area 1111 . When the fastener 1 punches the upper plate 100 , the first accommodating area 1111 is used to accommodate a portion of the upper plate 100 guided by the flange portion 11 .

[0038] Through the above structure, when in use, Figure 1As shown, the operator first prepares the preset fastener 1, and then points the rod 12 of the fastener 1 toward the preset position of the upper plate 100, and performs a stamping operation on the upper plate 100 with the fastener 1, so that the rod 12 can punch a through hole in the upper plate 100, and stamp part of the material in the original upper plate 100 to the position between the flange 11 and the rod 12 in the fastener 1, so that the fastener 1 and the upper plate 100 form an interference fit or a stuck state, that is, the upper plate 100 and the fastener 1 are completely fixed, and at the same time, the stamped and fixed rod 12 partially extends out of the upper plate 100. , and then the second side 1b of the position where the rod 12 extends out can be placed in contact with the lower plate 200, and spot welding can be performed by energizing the upper electrode 2 and the lower electrode 3, and during the energization process, the upper electrode 2 and the lower electrode 3 are squeezed toward the direction of the fastener 1, so that the fastener 1, the upper plate 100 and the lower plate 200 are partially deformed in a direction not parallel to the axial direction in a short time under the action of large current and extrusion, and a new stable weld nugget is melted in the preset area, so that the fastener 1, the upper plate 100 and the lower plate 200 are partially fixed together to complete the final spot welding operation.

[0039] In the above process, an axially extending accommodation space is formed below the inclined surface 111. When the fastener 1 is stamped on the upper plate 100, when the material accumulates to the position of the inclined surface 111 on the bottom side of the flange portion 11, since the inclined surface 111 is inclined from the edge position of the flange portion 11 to the axial direction away from the rod portion 12, the flange portion 11 generates axial resistance to the upper plate 100 material flowing from bottom to top, causing the material to accumulate in the axial direction. Specifically, that is to say, through the setting of the inclined surface 111, after the stamping is completed, there is a part of the material at the bottom side of the inclined surface 111, that is, at the first material storage area 1111. Compared with the existing setting without the inclined inclined surface 111, the material embedded in the first material storage area 1111 below the inclined surface 111 after the fastener 1 is stamped in this embodiment can make the flange portion 11 of the fastener 1 more stably fixed in the radial direction. When the fastener 1 is impacted by an external force in the radial direction, due to the physical fit between the axially embedded material and the bottom of the flange portion 11, the fastener of this embodiment is less likely to be radially displaced by the external force than a common interference fit structure without the above-mentioned physical fit.

[0040] Furthermore, the end of the flange portion 11 facing away from the rod portion 12 has a first surface 1a for bonding with the upper electrode 2, and the end of the rod portion 12 facing away from the flange portion 11 has a second surface 1b; after the fastener 1 is punched and fixed to the upper plate 100, the fastener 1 is passed through and fixed in the upper plate 100, and the second surface 1b is bonded to the lower plate 200, and the side of the lower plate 200 facing away from the fastener 1 has a third surface 200a for bonding with the lower electrode 3; specifically, the above-mentioned first surface 1a, second surface 1b and third surface 200a are all smooth planes along the radial direction, so that during spot welding, the upper electrode 2 and the lower electrode 3 can exert a sufficiently balanced fixing effect when applying pressure between the various structures.

[0041] Furthermore, the angle between the side wall of the flange 11 facing the rod 12 and the radial direction is 5 degrees. During high-speed stamping, the angle of the inclined surface 111 can achieve sufficient flow-guiding effect on the metal material of the upper plate 100, and the flange 11 is not excessively bent and concave, and the flange 11 still maintains sufficient structural strength.

[0042] Furthermore, if Figure 2-3 As shown, the outer wall of the rod 12 has a first surface 121 at the connection position between the rod 12 and the side wall of the flange 11 facing the rod 12, and the first surface 121 is inclined axially from the flange 11 to the rod 12. Specifically, through the setting of the first surface 121, after the fastener 1 punches the upper plate 100, the contact surface between the fastener 1 and the upper plate 100 penetrated is larger, so that a better sealing effect is achieved, and the upper side of the upper plate 100 and the lower side of the upper plate 100 are effectively physically isolated, so as to avoid gas or liquid from penetrating through the fastener 1 to affect the service life of the overall structure.

[0043] Specifically, the angle between the first surface 121 and the axial direction is between 30 degrees and 60 degrees, and preferably 45 degrees in this embodiment. By setting the first surface 121 at a relatively inclined angle, the contact surface between the fastener 1 and the upper plate 100 through which it is passed can be maximized, and physical isolation can be formed between the flange portion 11 and the rod portion 12 to the greatest extent.

[0044] Furthermore, the outer wall of the rod 12 has a second surface 122 on the side connected to the first surface 121 and away from the flange 11, and the second surface 122 is inclined axially from the rod 12 to the flange 11. At the same time, the second surface 122 has a second material receiving area 1221 on the side radially away from the rod 12, and when the fastener 1 stamps the upper plate 100, the material of the upper plate 100 is guided to the second material receiving area 1221 by the flange 11. Specifically, through the above structure, a larger accommodating space that is obliquely concave toward the axial direction is jointly formed between the inclined surface 111, the first surface 121 and the second surface 122, which includes a second material accommodating area 1221. After the fastener 1 is stamped against the upper plate 100, part of the material of the upper plate 100 enters the second material accommodating area 1221 in the radial space on the side of the second surface 122. When the fastener in this embodiment is impacted by an external force in the axial direction, due to the physical fit formed by the radially embedded material and the side wall of the rod 12, the fastener in this embodiment is less likely to be axially displaced by external force than an ordinary interference fit structure without the above-mentioned physical fit.

[0045] Specifically, the angle between the second surface 122 and the axial direction is between 1 and 10 degrees, and preferably 5 degrees in this embodiment. By setting the second surface 122 at a relatively inclined angle, during high-speed stamping, the second material storage area 1221 formed by the angle of the second surface 122 can be easily filled with flowing material, and the rod 12 is not excessively bent and concave, and the rod 12 still maintains sufficient structural strength.

[0046] In another embodiment, if Figure 4 As shown, the outer wall of the rod 12 includes teeth 126 arranged in the circumferential direction, so that when the fastener 1 is stamping the upper plate 100, the material of the upper plate 100 enters the teeth 126. Specifically, this embodiment is particularly suitable for the case where the axial thickness of the upper plate 100 is relatively thick, so that more material of the upper plate 100 can be embedded in the teeth 126 on the outer periphery of the rod 12, so that the fastener 1 can have a strong effect of resisting circumferential external forces.

[0047] In another embodiment, the outer periphery of the rod portion is provided with a second surface 122 inclined axially from the rod portion 12 to the flange portion 11, and a circumferentially arranged flower teeth 126 are provided on the basis of the second surface 122, so that the fastener 1 has a strong effect of resisting circumferential and axial external forces.

[0048] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0049] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A fastener for spot welding, used to connect an upper plate and a lower plate; characterized in that: The fastener comprises: A flange portion extending in the axial direction; A rod portion, the rod portion extending along the axial direction, the diameter of the flange portion along the axial direction being greater than the diameter of the rod portion along the axial direction; The flange portion has a first end facing the stem portion and a second end facing away from the stem portion, The first end of the flange portion has an inclined surface, and the inclined surface gradually inclines inward from the first end of the flange portion toward the second end; The inclined surface is used to form a first accommodating area, and when the fastener punches the upper plate, the first accommodating area is used to accommodate a portion of the upper plate guided by the flange portion.

2. The fastener for spot welding according to claim 1, characterized in that: The included angle between the inclined surface and the radial direction is 5 degrees.

3. The fastener for spot welding according to claim 1, characterized in that: The outer wall of the rod portion has a first surface at a connection position between the rod portion and a wall surface of a side of the flange portion facing the rod portion, and the first surface is inclined toward the axial direction from the flange portion to the rod portion.

4. The fastener for spot welding according to claim 3, characterized in that: The included angle between the first surface and the axial direction is between 30 degrees and 60 degrees.

5. The fastener for spot welding according to claim 3, characterized in that: The outer wall of the rod portion further comprises a second surface on a side connected to the first surface and away from the flange portion, and the second surface is inclined toward the axial direction from the rod portion to the flange portion.

6. The fastener for spot welding according to claim 5, characterized in that: The second surface has a second material accommodating area on a side radially away from the rod portion. When the fastener punches the upper plate, the material of the upper plate is guided to the second material accommodating area by the flange portion.

7. The fastener for spot welding according to claim 5, characterized in that: An included angle between the second surface and the axial direction is between 1 degree and 10 degrees.

8. The fastener for spot welding according to claim 1, characterized in that: The outer wall of the rod portion includes teeth arranged in a circumferential direction, so that when the fastener punches the upper plate, the material of the upper plate enters the teeth.

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