Material connecting structure for solving plate thickness tolerance

Abstract

The utility model discloses a material connecting structure for solving plate thickness tolerance, which comprises a fastener, the fastener comprises a flange part and a rod part which are connected with each other, and the axial diameter of the flange part is larger than that of the rod part; wherein the flange part is provided with a first face used for being attached to an upper electrode, and the rod part is provided with a second face; after the fastener stamps and fixes the upper layer plate, the fastener is fixed in the upper layer plate in a penetrating manner, the second surface is attached to the lower layer plate, and the lower layer plate is used for being attached to a lower electrode; a notch is formed in one end, deviating from the flange part, of the rod part, and is opened in the direction deviating from the flange part; when spot welding is carried out after the upper electrode and the lower electrode apply pressure to the fastener and electrify the fastener, the outer ring wall of the rod part can deform and contract towards the notch in the axial direction, so that the upper-layer plate and the lower-layer plate are tightly attached. According to the utility model, through the arrangement of the notch and the outer ring wall, the structure has the effects of light weight and adaptation to different plate thicknesses.

Description

Technical Field

[0001] The utility model relates to a spot welding technology, in particular to a material connection structure for solving plate thickness tolerance. 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 the existing mass production, usually the fastener is first 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 then 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. In the above process, since there may be certain tolerances in the production of the plate itself, it is difficult to meet the requirements for gap control between the upper plate and the lower plate. At the same time, when connecting plates of different thicknesses, in order to ensure that there is no gap between the upper plate and the lower plate, it is necessary to prepare fasteners with a length that matches the plate in advance, that is, fasteners of a single length are difficult to adapt to a variety of plate thicknesses, resulting in higher costs. At the same time, the weight of existing fasteners is also heavy, which is not conducive to lightweight structure.

[0005] Currently, there is no material connection structure for solving plate thickness tolerance that can solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a material connection structure for solving the plate thickness tolerance, which can achieve the effects of lightness and adaptability to different plate thicknesses through the arrangement of the notch and the outer ring wall.

[0007] In order to achieve the above purpose, the material connection structure for connecting the upper plate and the lower plate for solving the plate thickness tolerance includes:

[0008] A fastener, the fastener comprising a flange portion and a rod portion connected to each other, the diameter of the flange portion along the axial direction being larger than the diameter of the rod portion along the axial direction; wherein the end of the flange portion away from the rod portion has a first surface for affixing to the upper electrode, and the end of the rod portion away from the flange portion has a second surface;

[0009] After the fastener punches and fixes the upper plate, the fastener can be passed through and fixed on the upper plate, the second surface is bonded to the lower plate, and the side of the lower plate away from the fastener is used to bond with the lower electrode;

[0010] The rod portion has a notch at one end thereof away from the flange portion, and the notch opens in a direction away from the flange portion;

[0011] When the upper electrode and the lower electrode pressurize and energize the fastener to perform spot welding, the outer annular wall of the rod portion may deform and shrink along the axial direction toward the recess, so that the upper plate and the lower plate fit tightly.

[0012] Further, the length of the rod portion along the axial direction is greater than the thickness of the upper plate along the axial direction, so that after the fastener is punched into the upper plate, a portion of the rod portion can extend out of the upper plate.

[0013] Further, the rod portion includes an axially extending leg portion at a middle position of the recess.

[0014] Furthermore, the leg portion is configured to be cylindrical, and the height of the leg portion along the axial direction is flush with the outer ring wall.

[0015] Furthermore, the leg portion is configured to be a truncated cone with a diameter on one side in the direction of the flange portion being larger than a diameter on one side in the direction of the rod portion, and a height of the leg portion along the axial direction is flush with the outer annular wall.

[0016] Furthermore, the height of the leg portion along the axial direction away from the flange side is smaller than the height of the outer ring wall; wherein, before spot welding, when the outer ring wall abuts against the lower plate, the leg portion does not contact the lower plate; after spot welding, the outer ring wall is deformed, and the leg portion is connected to the lower plate.

[0017] Furthermore, the recess includes a plurality of inner annular walls with different diameters along the radial direction.

[0018] Furthermore, the heights of the plurality of inner annular walls and the outer annular wall along the axial direction are equal.

[0019] Furthermore, the spacing between the plurality of inner annular walls and the outer annular wall along the radial direction is equal.

[0020] Furthermore, the inner wall of the recess has an internal thread.

[0021] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0022] 1. The material connection structure for solving the plate thickness tolerance of the utility model can be formed by setting a notch on one side of the rod of the fastener and forming an outer ring wall, so that during spot welding, the outer ring wall can shrink along the axial direction, so that the gap between the upper plate and the lower plate after spot welding is completely fitted to adapt to upper plates of different thicknesses, while also avoiding the production tolerance problem of the plate.

[0023] 2. The material connection structure for solving the plate thickness tolerance of the utility model can effectively reduce the overall weight of the fastener through the notch setting in the fastener, making the structure lighter and meeting the lightweight requirements of the equipment. 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 cross-sectional schematic diagram of a fastener with a notch in a material connection structure for solving plate thickness tolerance provided in an embodiment of this specification;

[0026] Figure 2 It is a three-dimensional diagram of a fastener with a notch in a material connection structure for solving plate thickness tolerance provided in an embodiment of this specification;

[0027] Figure 3 It is a cross-sectional schematic diagram of a fastener with a leg portion of a material connection structure for solving plate thickness tolerance provided by an embodiment of this specification;

[0028] Figure 4 It is a three-dimensional diagram of a fastener with a leg portion of a material connection structure for solving plate thickness tolerance provided by an embodiment of this specification;

[0029] Figure 5 It is a cross-sectional schematic diagram of a fastener with a shorter leg portion of a material connection structure for solving plate thickness tolerance provided by an embodiment of this specification;

[0030] Figure 6 It is a cross-sectional schematic diagram of a fastener with an inner ring wall for a material connection structure for solving plate thickness tolerance provided in an embodiment of this specification;

[0031] Figure 7 It is a cross-sectional schematic diagram of a fastener with internal threads of a material connection structure for solving plate thickness tolerance provided in an embodiment of this specification;

[0032] In the figure: 100, upper plate; 200, lower plate; 200a, third surface; 1, fastener; 11, flange; 12, rod; 123, outer annular wall; 124, leg; 125, inner annular wall; 1a, first surface; 1b, second surface; 14, recess; 2, upper electrode; 3, lower electrode. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] See also Figure 1-2 , is a material connection structure for solving the plate thickness tolerance of this embodiment, which is used to connect the upper plate 100 and the lower plate 200; wherein the material connection structure for solving the plate thickness tolerance includes:

[0037] A fastener 1, comprising a flange portion 11 and a rod portion 12 connected to each other, wherein the diameter of the flange portion 11 along the axial direction is greater than the diameter of the rod portion 12 along the axial direction; wherein an end of the flange portion 11 away from the rod portion 12 has a first surface 1a for contacting with the upper electrode 2, and an end of the rod portion 12 away from the flange portion 11 has a second surface 1b;

[0038] After the fastener 1 is punched and fixed to the upper plate 100, the fastener 1 is inserted 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 has a third surface 200a for bonding with the lower electrode;

[0039] The rod portion 12 has a notch 14 at one end thereof facing away from the flange portion 11 , and the notch 14 opens in a direction facing away from the flange portion 11 ;

[0040] When the upper electrode 2 and the lower electrode 3 press and energize the fastener 1 for spot welding, the outer annular wall 123 of the rod 11 may deform and shrink axially toward the notch 14 to make the upper plate 100 and the lower plate 200 fit tightly.

[0041] Through the above structure, when in use, 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 of the fastener 1 on the upper plate 100, 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 rod 12 after stamping and fixing partially extends to the upper plate 100. The outer side of the layer 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 layer plate 200, and the upper electrode 2 and the lower electrode 3 can be energized, and during the energization process, the upper electrode 2 and the lower electrode 3 are squeezed toward the direction of the fastener 1 to perform spot welding, so that the fastener 1, the upper plate 100 and the partial area of ​​the lower plate 200 are subjected to the action of large current and extrusion, and deformed in a direction not parallel to the axial direction in a short time, and a new stable weld nugget is melted in the preset area, so that the partial area of ​​the fastener 1, the upper plate 100 and the lower plate 200 is fixed together, completing the final spot welding operation.

[0042] In the above process, when the outer annular wall 123 contacts the lower plate 200, in the default state, the outer annular wall 123 has a sufficient length in the axial direction, so that there is a certain gap supported by the fastener between the upper plate 100 and the lower plate 200. During spot welding, the upper electrode 2 and the lower electrode 3 simultaneously apply pressure and energize the fastener, and the annular wall 123 softens and gradually deforms after high temperature. Due to the presence of the notch 14, most of the outer annular wall 123 deforms and enters the space of the notch 14, and a small part of the outer annular wall 123 deforms and enters the gap between the upper plate 100 and the lower plate 200. During the spot welding process, the outer annular wall 123 of the fastener 1 continues to soften and deform, so that the height of the fastener along the axial direction gradually decreases until the gap between the upper plate 100 and the lower plate 200 completely disappears. At this time, a seamless tight fit is formed between the upper plate 100 and the lower plate 200.

[0043] That is to say, through the configuration of the outer annular wall 123 and the recess 14 in this embodiment, it is possible to adapt to upper plates 100 of various thicknesses in the case of an axially longer fastener, so that the tolerances in different upper plate 100 application scenarios are smoothed after the deformation of the outer annular wall 123, so that the fastener of this embodiment can adapt to upper plates 100 of various thicknesses, and can achieve seamless fit between the upper plate 100 and the lower plate 200. Similarly, this embodiment can also make up for the tolerances generated during the production of the upper plate 100, eliminate the situation that it is difficult to fit with the fastener due to the output quality problem of the upper plate 100 itself, and compensate for the tolerance value of the upper plate 100.

[0044] Of course, it is worth noting that in this embodiment, after the upper plate 100 is punched by the fastener, the punched waste in the notch 14 needs to be discharged in time to avoid affecting the effect of the fastener structure. Specifically, in this embodiment, the upper plate 100 and the lower plate 200 can be made of the same material, such as the upper plate 100 and the lower plate 200 are both steel, or different materials, such as the upper plate 100 is a light metal such as aluminum and the lower plate 200 is steel, and both can be connected by the method of the present invention.

[0045] Furthermore, the axial length of the rod portion 12 is greater than the axial thickness of the upper plate 100, so that when the fastener 1 is punched into the upper plate 100, a portion of the rod portion 12 can extend out of the upper plate 100. Through the above-mentioned structural arrangement, the outer annular wall 123 at one end of the rod portion 12 can effectively contact the lower plate 200 during the spot welding process.

[0046] Example 2

[0047] like Figure 3-4 As shown, in this embodiment, the rod 12 includes an axially extending leg 124 at the middle position of the notch 14. The leg 124 is configured to be cylindrical or a truncated cone with a diameter on one side of the flange 11 being larger than a diameter on one side of the rod 12.

[0048] Specifically, by setting the leg 124, during spot welding, the outer ring wall 123 and the leg 124 can be deformed together and tightly welded to the lower plate 200, so that there is a larger contact area between the fastener 1 and the lower plate 200, and the welding strength is increased while only partially increasing the process cost. The cylindrical or truncated cone shape is also easy to process, and after spot welding, the force between the fastener 1 and the lower plate 200 is more even. Preferably, the leg 124 is set to a truncated cone shape, which is more stable and deforms evenly in the process of being pressed and deformed by the upper electrode 2 and the lower electrode 3. It is worth noting that the height of the leg 124 along the axial direction is flush with the outer ring wall 123, so that during spot welding, the outer ring wall 123 and the leg 124 are deformed together to form a stable weld core.

[0049] In another embodiment, a right cylindrical leg 124 extending along the axial direction is used. Compared with a truncated cone, the processing technology thereof is simpler and the cost can be effectively controlled.

[0050] Example 3

[0051] like Figure 5 As shown, in this embodiment, the axial height of the leg 124 away from the side of the flange portion 11 is less than the height of the outer ring wall 123; wherein, before spot welding, when the outer ring wall 123 abuts against the lower plate 200, the leg 124 does not contact the lower plate 200; after spot welding, the outer ring wall 123 is deformed, and the leg 124 is connected to the lower plate 200.

[0052] Through the above structure, the main purpose of this embodiment is to provide a stronger structural connection point between the fastener 1 and the lower plate 200. Compared with Example 2, the leg 124 only slightly participates in the deformation during spot welding. Therefore, through a certain preset clearance of the leg 124, the excessive spot welding extrusion resistance caused by the leg 124 being too thick can be ignored, so that the leg 124 can be made into a larger diameter, so that the welding surface between the fastener 1 and the lower plate 200 can be made larger.

[0053] Example 4

[0054] like Figure 6 As shown, in this embodiment, the recess 14 includes a plurality of inner annular walls 125 with different radial diameters, and the plurality of inner annular walls 125 and the outer annular wall 123 have equal heights in the axial direction, and the plurality of inner annular walls 125 and the outer annular wall 123 have equal radial spacings.

[0055] Through the structure of this embodiment, during spot welding, multiple rings of multiple inner ring walls 125 and outer ring walls 123 can be deformed at the same time under the pressure of the upper and lower electrodes and welded to the top surface of the lower plate 200. Compared with embodiment 1, it can be applied to different plate thicknesses and has a stronger and more stable welding effect. The cost is only slightly higher in terms of process, which can be selected according to actual needs. The equal radial spacing of the inner ring wall 125 and the outer ring wall 123 can make the area of ​​the connection position of the multiple inner ring walls 125 and the outer ring wall 123 with the lower plate 200 more uniform after deformation.

[0056] Example 5

[0057] like Figure 7 As shown, in this embodiment, the inner wall of the notch 14 has an internal thread. By adding the internal thread process, the outer ring wall 123 is more easily compressed and deformed after the upper electrode 2 and the lower electrode 3 are squeezed and energized, which helps to improve the efficiency of spot welding, and because the outer ring wall 123 is easier to deform, the spot welding process is more stable, which helps to improve the yield rate.

[0058] Of course, in another embodiment, the inner wall of the recess 14 has other textures besides the cut threads, which can also meet the requirement of reducing the strength of the outer annular wall 123 so that the outer annular wall 123 can be effectively deformed during spot welding.

[0059] 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.

[0060] 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 material connection structure for solving plate thickness tolerance, used for connecting an upper plate and a lower plate; characterized in that: The material connection structure for solving the plate thickness tolerance includes: A fastener, the fastener comprising a flange portion and a rod portion connected to each other, the diameter of the flange portion along the axial direction being larger than the diameter of the rod portion along the axial direction; wherein the end of the flange portion away from the rod portion has a first surface for affixing to the upper electrode, and the end of the rod portion away from the flange portion has a second surface; After the fastener punches and fixes the upper plate, the fastener can be passed through and fixed on the upper plate, the second surface is bonded to the lower plate, and the side of the lower plate away from the fastener is used to bond with the lower electrode; The rod portion has a notch at one end thereof away from the flange portion, and the notch opens in a direction away from the flange portion; When the upper electrode and the lower electrode pressurize and energize the fastener to perform spot welding, the outer annular wall of the rod portion may deform and shrink along the axial direction toward the recess, so that the upper plate and the lower plate fit tightly.

2. The material connection structure for solving plate thickness tolerance according to claim 1, characterized in that: The length of the stem along the axial direction is greater than the thickness of the upper plate along the axial direction, so that after the fastener is punched into the upper plate, a portion of the stem can extend out of the upper plate.

3. The material connection structure for solving plate thickness tolerance according to claim 1, characterized in that: The stem includes an axially extending leg portion at a mid-position of the recess.

4. The material connection structure for solving plate thickness tolerance according to claim 3, characterized in that: The leg portion is configured to be cylindrical, and the height of the leg portion along the axial direction is flush with the outer ring wall.

5. The material connection structure for solving plate thickness tolerance according to claim 3, characterized in that: The leg portion is configured to be a truncated cone with a diameter on one side in the direction of the flange portion being larger than a diameter on one side in the direction of the rod portion, and a height of the leg portion along the axial direction is flush with the outer annular wall.

6. The material connection structure for solving plate thickness tolerance according to claim 3, characterized in that: The height of the leg portion along the axial direction away from the flange portion is less than the height of the outer ring wall; wherein, before spot welding, when the outer ring wall abuts against the lower plate, the leg portion does not contact the lower plate; after spot welding, the outer ring wall is deformed, and the leg portion is connected to the lower plate.

7. The material connection structure for solving plate thickness tolerance according to claim 1, characterized in that: The recess includes a plurality of inner annular walls with different radial diameters.

8. The material connection structure for solving plate thickness tolerance according to claim 7, characterized in that: The inner annular walls and the outer annular wall have the same height along the axial direction.

9. The material connection structure for solving plate thickness tolerance according to claim 7, characterized in that: The inner annular walls and the outer annular walls are spaced at equal intervals along the radial direction.

10. The material connection structure for solving plate thickness tolerance according to claim 7, characterized in that: The inner wall of the recess has an internal thread.

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