Bolt for connecting boards

Abstract

The utility model relates to a bolt for connecting plates, the bolt comprises a bolt head, a bolt body and a hole part, the bolt head, the bolt body and the hole part are sequentially connected, the cross section of the hole part is quadrangle with arc transition corner, the side of the hole part has certain radian R, the cross section quadrangle of the hole part gradually expands from the tip to the bolt body end, the bolt head comprises a driving part and a flange part, the flange part is connected with the bolt body, the connecting place of the flange part with the bolt body is provided with annular recess for accommodating the slag generated in the plate connecting process. The application adopts the hole part of four sides, the side has certain radian R, the quadrangle with radian R shape is more helpful to the bolt assembly process, makes the connecting plate surface plastic flow faster, the assembly torque is smaller, makes the clamping force of the bolt to the plate larger.

Description

Technical Field

[0001] This utility model relates to a fastener, and more particularly to a plate connecting bolt with holes on four sides. Background Technology

[0002] With the development of science and technology and the advancement of technology, industrial products are changing rapidly and have become almost indispensable necessities in people's daily lives. During the design of industrial products, each component is pre-defined according to design requirements and assembled using connectors and fasteners. These components, connectors, and fasteners work together to ensure the safety and comfort of industrial products; therefore, higher requirements are placed on fastener products.

[0003] Existing technologies for connecting thin metal sheets and for bolts typically require pre-drilling and tapping before bolts can be screwed into fasteners. Pre-drilling of the sheet metal is mainly achieved through stamping, drilling, and stretching, followed by tapping or extrusion to form threads, which is quite time-consuming.

[0004] Therefore, there is room for improvement in the bolts used for connecting sheet metal in existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a plate connecting bolt with a simple structure, improved screw tail structure, enhanced hot melt hole-breaking performance, and four-sided opening, in order to solve the problems of the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bolt for connecting plates, the bolt comprising a bolt head, a bolt body, and a hole, the bolt head, bolt body, and hole being connected sequentially; the cross-section of the hole is a square with rounded corners, the side of the hole has a certain curvature R, and the cross-section of the hole gradually widens from the tip to the end of the bolt body; the bolt head includes a drive part and a flange part, the flange part being connected to the bolt body part, and an annular groove is formed at the connection between the flange part and the bolt body part to accommodate slag generated during the plate connection process.

[0008] According to a preferred embodiment of the present invention, the bolt for connecting plates includes a threaded portion and a smooth shank portion, which are connected by a frustum, and the smooth shank portion is connected to the opening portion.

[0009] According to the preferred embodiment of the present invention, the bolt for connecting plates has a driving part that is uniformly distributed in an outward hexagonal shape, and the upper surface of the driving part is a flat surface.

[0010] The design concept of this application is to design a bolt for connecting sheet metal with an arc-shaped, four-sided open thread at the tail. When the bolt rotates, it can drill holes in the sheet metal and self-tap to tighten the sheet metal, eliminating the need for pre-drilled holes. The open portion of the tail thread has a square cross-section, and the cross-section of the open portion gradually expands from the pointed end to the cylindrical end, improving the thermal melting and hole-breaking performance and making the bolt connection performance more stable. In addition, the bolt can reach a maximum speed of 8000 rpm and be used for 6-8 seconds, allowing the sheet metal to be thermally melted and penetrated. When there is no guide hole in the sheet metal, the sheet metal metal generated by thermal melting will flow up and down. The flange head is designed with a groove to accommodate the upward flow of sheet metal metal, ensuring that the bolt head fits the sheet metal, making the structure reliable, achieving safe production, and improving the company's market competitiveness.

[0011] Due to the adoption of the above technical solutions, this utility model has the following advantages and effects:

[0012] First, the bolts in this application have four-sided openings and a certain curvature R on the sides. The square shape with curvature R is more conducive to the faster plastic flow on the surface of the connecting plate during the bolt assembly process. The material squeezed out after the bolt penetrates the workpiece accumulates more evenly on the back of the metal plate, reducing the friction between the part and the plate during drilling, resulting in a smaller assembly torque and a greater clamping force of the bolt on the plate.

[0013] Secondly, the driving part of the bolt in this application adopts an external hexagonal shape. The evenly distributed external hexagonal shape is conducive to the stable high-speed rotation of the bolt without slippage. The structure is reliable and suitable for machine driving, achieving safe production and improving the company's market competitiveness.

[0014] Of course, implementing any specific embodiment of the content of this application does not necessarily have all of the above technical effects at the same time. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the bolts in this application;

[0016] Figure 2 for Figure 1 A top-down view;

[0017] Figure 3 for Figure 1 AA sectional view;

[0018] Figure 4 This is an enlarged schematic diagram of the bare rod portion and the opening portion of this application;

[0019] Figure 5 This is a schematic diagram of the bolts and plates used in this application. Detailed Implementation

[0020] The present invention will be described in detail below with reference to the accompanying drawings;

[0021] Please refer to Figure 1 The bolt of this application is shown in a cross-sectional view. The bolt has an arc-shaped four-sided opening and a tail thread. When the bolt rotates, it can open a hole in the plate and self-tap to fasten the plate, eliminating the need for pre-drilled holes. The cross-section of the opening gradually expands from the tip to the cylindrical end, improving the heat-melting hole-breaking performance and making the bolt connection performance more stable.

[0022] like Figure 1 As shown, the bolt includes a bolt head 10, a bolt body 20, and a hole 30, which are sequentially connected and integrally formed. Please refer to... Figure 3 The cross-section of the opening portion 30 is a square with rounded corners. The side of the opening portion 30 has a certain curvature R. The cross-section of the opening portion 30 gradually widens from the tip to the end of the bolt body portion 20. Figure 4 The cross-section of the opening portion 30 gradually increases from bottom to top, and the opening portion 30 is a four-sided opening with an arc R, which gradually decreases from top to bottom. This application adopts a four-sided screw tail structure, which makes the installation torque more stable and allows the plastic flow on the surface of the connecting plate to be faster. The final tightening torque can be controlled within ±10% of the required range of the connecting joint. The bolt head 10 includes a driving part 11 and a flange part 12. The flange part 12 is connected to the bolt body part 20. An annular groove 13 is provided at the connection between the flange part 12 and the bolt body part 20 to accommodate the material generated during the plate connection process. The bolts of this application adopt a rotary tapping connection process, which is a cold forming process that connects the bolts by tapping after the plate is thermally deformed during high-speed rotation. Therefore, during connection, the high-speed rotation speed of the opening part 30 can reach up to 8000 rpm and last for 6-8 seconds. The plate being processed is thermally melted and penetrated. When there is no guide hole in the plate, the slag generated by the thermal melting of the plate moves up and down. With the annular groove 13 accommodating the upwardly moving slag, the slag will not affect the stability of the connection. After the bolt penetrates the workpiece, the material squeezed out accumulates more evenly on the back of the metal plate, reducing the friction between the part and the plate during drilling.

[0023] Please refer to Figure 1 and Figure 4 The bolt body 20 includes a threaded portion 21 and a smooth shank portion 22, which are connected by a frustum 23. The diameter of the threaded portion 21 is larger than the diameter of the smooth shank portion 22. The lower end of the smooth shank portion 22 is connected to the opening portion 30, meaning the smooth shank portion 22 serves as a transitional connection to the opening portion 30. The total thread length of the threaded portion 21 exceeds the thickness of the bottom plate and is more than twice the bolt pitch.

[0024] Please refer to Figure 1 and Figure 5 The driving part 11 is a uniformly distributed hexagonal shape, and the upper surface of the driving part 11 is a flat surface, which can be used to engrave trademarks, for example... Figure 2 As shown in the embodiment of this application, the trademark pattern "CH" is engraved on the flat surface, but this cannot be used to limit this application; the flat driving surface formed by the evenly distributed hexagonal pattern is beneficial for stabilizing the high-speed rotation of the drive bolt without slippage, and the structure is reliable and suitable for machine drive, such as... Figure 5 As shown, the arc-shaped arrow indicates the clockwise rotation of the bolt during the connection process. When using the installation bolt, special equipment is required to apply corresponding pressure and speed to the bolt head 10. Under the action of friction and axial pressure, the surface of the plates to be connected is plasticized and begins to flow; the bolt penetrates the workpiece, and the extruded material accumulates on the back of the metal plate; the axial force and speed of the bolt decrease, and the first two turns of the thread face begin to tap the thread, forming a thread; the torque continues to increase and reaches the torque required to form the thread, then the torque decreases, and the bolt continues to tighten; the bolt is tightened to a fixed torque, and as the metal of the connected part cools, the material shrinks to fill the thread and improve the fastening performance.

[0025] Please refer to Figure 5 The bolts in this application are used to connect plates. In this embodiment, only two plates are used for illustration. Neither the first plate nor the second plate needs to be pre-drilled. The plates connected by the bolts in this application are 1.5mm-4mm aluminum profiles or about 3mm steel plates. To explain the connected plates, the first plate and the second plate can be plates of the same material or plates of different materials.

[0026] It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0027] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0029] Due to the adoption of the above technical solutions, this utility model has the following advantages and effects:

[0030] First, the bolts in this application have four-sided openings and a certain curvature R on the sides. The square shape with curvature R is more conducive to the faster plastic flow on the surface of the connecting plate during the bolt assembly process. The material squeezed out after the bolt penetrates the workpiece accumulates more evenly on the back of the metal plate, reducing the friction between the part and the plate during drilling, resulting in a smaller assembly torque and a greater clamping force of the bolt on the plate.

[0031] Secondly, the driving part of the bolt in this application adopts an external hexagonal shape. The evenly distributed external hexagonal shape is conducive to the stable high-speed rotation of the bolt without slippage. The structure is reliable and suitable for machine driving, achieving safe production and improving the company's market competitiveness.

[0032] The above-disclosed embodiments are only a few specific examples of this utility model, but this utility model is not limited thereto. Any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A bolt for joining boards, characterized by: The bolt includes a bolt head, a bolt body, and a hole, which are connected sequentially. The cross-section of the hole is a square with rounded corners, and the side of the hole has a certain curvature R. The cross-section of the hole gradually widens from the tip to the end of the bolt body. The bolt head includes a drive part and a flange part, which is connected to the bolt body. An annular groove is provided at the connection between the flange part and the bolt body to accommodate slag generated during the connection of the plates.

2. The bolt for connecting plates as described in claim 1, characterized in that: The bolt body includes a threaded portion and a smooth shank portion, which are connected by a frustum, and the smooth shank portion is connected to the opening portion.

3. The bolt for connecting boards as set forth in claim 2, wherein: The driving part is a uniformly distributed hexagonal shape, and the upper surface of the driving part is a flat surface.

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