Rivet and flat bottom riveting device for riveting composite material to metal plate

Abstract

The utility model discloses rivet and flat bottom riveting device of riveting of composite material and metal sheet in the material riveting technical field, including rivet rod, the top of rivet rod is provided with flange, the bottom of rivet rod is provided with self punch end, the bottom of self punch end is horizontal, the outer surface of rivet rod is set up with the interlocking groove of self punch end top, the utility model discloses through setting up rivet rod, cutting material boss, upper die assembly and lower die assembly, make composite material board need not prefabricated hole and adopt the method of self -piercing riveting and metal sheet riveting, utilize the rivet rod with interlocking groove cooperation upper die assembly and lower die assembly, realize the effective blanking cutting of composite material and metal sheet and riveting, and through the design of cutting material boss, make the middle part of the bottom end of metal sheet be extruded deformation by cutting material boss when riveting, not only cancel the trepanning process, solve the problem to the hole, guarantee the back of metal sheet even no boss, avoid the interference situation of metal sheet and lower structure spare.

Description

Technical Field

[0001] This utility model relates to the field of material riveting technology, and in particular to rivets and flat-bottom riveting devices for riveting composite materials and metal plates. Background Technology

[0002] Carbon fiber reinforced composites have advantages such as high specific strength and specific modulus, good fatigue resistance, low coefficient of thermal expansion and good corrosion resistance. They are often combined with metal materials such as aluminum alloys and riveted together and are widely used in the automotive manufacturing and aerospace fields.

[0003] However, existing technologies have some problems: due to the poor plasticity of carbon fiber composites, in practical applications, it is usually necessary to pre-drill holes in the composite material before it can be riveted to the metal plate. Pre-drilling holes will increase the riveting process and the difficulty of aligning the tooling and the hole. At the same time, common riveting methods will form a protruding structure on the back of the metal plate, causing interference between the metal plate and the underlying structural components. Therefore, we propose a rivet and flat-bottom riveting device for riveting composite materials to metal plates. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rivet and a flat-bottom riveting device for riveting composite materials and metal plates. By riveting composite materials and metal plates through self-piercing, it eliminates the need for pre-drilled holes in the composite material and ensures that the back of the metal plate is flat and free of protrusions.

[0005] The purpose of this utility model is achieved as follows: a rivet for riveting composite materials to metal plates includes a rivet rod, the top of the rivet rod is provided with a flange, the bottom of the rivet rod is provided with a self-punching end, the bottom of the self-punching end is horizontal, and an interlocking groove is opened on the outer surface of the rivet rod above the self-punching end, the interlocking groove surrounding the outer surface of the rivet rod.

[0006] Optionally, the diameter of the flange is larger than the diameter of the rivet, and the end of the flange facing the rivet has a head tilt angle.

[0007] A flat-bottomed riveting device for riveting composite materials and metal plates includes the aforementioned rivets for riveting composite materials and metal plates, and also includes an upper die assembly and a lower die assembly for clamping and punching sheet metal. The upper die assembly includes a pressure ring and a punch, and the lower die assembly includes a cutting die. The cutting die has a circular groove, and a ejector assembly is provided inside the circular groove for discharging punching waste. A cutting boss is provided on the top of the cutting die.

[0008] Optionally, the pressure ring has a through hole in the middle, and the punch is movably inserted into the through hole with the diameter of the punch matching the inner diameter of the through hole.

[0009] Optionally, the top material assembly includes a spring, one end of which is fixedly connected to the inner wall of the circular groove, and the other end of which is fixedly connected to a floating support mold, the floating support mold being movably installed inside the circular groove.

[0010] Optionally, the cutting boss is disposed around the edge of the top of the circular groove, and the cutting boss is coaxial with the circular groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, by setting up a rivet rod, a self-punching end, a cutting boss, an upper die assembly, and a lower die assembly, enables the composite material sheet to be riveted to the metal sheet without pre-drilling holes using a self-piercing riveting connection method. The rivet rod with interlocking grooves, in conjunction with the upper and lower die assemblies, achieves effective punching, cutting, and riveting of the composite material and the metal sheet. Furthermore, the design of the cutting boss causes the center of the bottom end of the metal sheet to be compressed and deformed during riveting, eliminating the need for drilling and solving the hole-fitting problem. It also ensures that the back of the metal sheet is flat and free of protrusions, preventing interference between the metal sheet and the underlying structural components. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is a structural schematic diagram provided by this utility model.

[0014] Figure 2 This is a structural schematic diagram of the rivet provided by this utility model.

[0015] Figure 3 This is a cross-sectional structural diagram of the rivet provided by this utility model.

[0016] Figure 4 This is a cross-sectional structural diagram of the blanking process provided by this utility model.

[0017] Figure 5 This is a cross-sectional structural diagram of the punching process provided by this utility model.

[0018] Figure 6 This is a cross-sectional structural diagram of the riveting operation provided by this utility model.

[0019] Figure 7 This is a cross-sectional view of the riveting structure provided by this utility model.

[0020] In the diagram: 1. Rivet; 2. Flange; 3. Self-punching end; 4. Interlocking groove; 5. Head tilt angle; 6. Pressure ring; 7. Punch; 8. Cutting die; 9. Circular groove; 10. Cutting boss; 11. Through hole; 12. Spring; 13. Floating support die. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 7 As shown, the rivet for riveting composite materials and metal plates provided in this embodiment of the present invention includes a rivet rod 1, a flange 2 provided at the top of the rivet rod 1, a self-punching end 3 provided at the bottom of the rivet rod 1, the bottom of the self-punching end 3 being horizontal, and an interlocking groove 4 located above the self-punching end 3 being opened on the outer surface of the rivet rod 1, the interlocking groove 4 surrounding the outer surface of the rivet rod 1.

[0023] The rivet 1 is placed inside the through hole 11. The driving punch 7 moves downward and abuts against the flange 2. The rivet 1 and the self-punching end 3 punch the material plate. The interlocking groove 4 is set so that the lower metal plate can be riveted into the interlocking groove 4 after punching, thereby cooperating with the flange 2 to realize the riveting of the composite material and the metal plate.

[0024] Furthermore, the diameter of flange 2 is larger than the diameter of rivet 1, and the end of flange 2 facing rivet 1 is provided with a head tilt angle 5.

[0025] By setting the head tilt angle 5, in the riveting installation state, the flange 2 is flattened, which eliminates the head tilt angle 5. The flattened flange 2 can provide a continuous elastic preload due to its own elastic deformation, thereby improving the riveting effect.

[0026] A flat-bottomed riveting device for riveting composite materials and metal plates includes the aforementioned rivets for riveting composite materials and metal plates, as well as an upper die assembly and a lower die assembly for clamping and punching sheet metal. The upper die assembly includes a pressure ring 6 and a punch 7, and the lower die assembly includes a cutting die 8. A circular groove 9 is provided on the cutting die 8, and a ejector assembly is provided inside the circular groove 9 for discharging punching waste. A cutting boss 10 is provided on the top of the cutting die 8.

[0027] During punching, the pressure ring 6 presses the composite material and metal plate onto the cutting die 8, and the punch 7 presses down on the rivet 1, so that the rivet 1 punches the composite material and metal plate, pushing the punching waste into the circular groove 9. After punching, the metal plate will be riveted to the rivet 1 through the interlocking groove 4. During riveting, the pressure ring 6 increases the downward pressure on the composite material and metal plate, so that the middle part of the bottom end of the metal plate is squeezed and deformed by the cutting boss 10, thereby ensuring that the back of the metal plate is flat and without protrusions.

[0028] Furthermore, a through hole 11 is provided in the middle of the pressure ring 6, and the punch 7 is movably inserted into the through hole 11, with the diameter of the punch 7 matching the inner diameter of the through hole 11.

[0029] By driving the punch 7 downward to abut against the flange 2, the rivet 1 and the self-punching end 3 can punch the material plate.

[0030] Furthermore, the top material assembly includes a spring 12, one end of which is fixedly connected to the inner wall of the circular groove 9, and the other end of which is fixedly connected to a floating support mold 13, which is movably installed inside the circular groove 9.

[0031] By setting spring 12 to the normal state, after punching, the punching waste is pushed into the circular groove 9, which squeezes the floating support die 13, causing spring 12 to be in a compressed state. When the punching and riveting are completed and the material plate is removed, the elastic force of spring 12 will push the floating support die 13 to move upward, thereby ejecting the punching waste.

[0032] Furthermore, the cutting boss 10 is arranged around the edge of the top of the circular groove 9, and the cutting boss 10 is coaxial with the circular groove 9.

[0033] During riveting, by increasing the pressure of the pressure ring 6 on the composite material and the metal plate, the middle part of the bottom end of the metal plate is squeezed and deformed by the cutting boss 10, thereby ensuring that the back of the metal plate is flat and without protrusions.

[0034] Working principle and usage process of this utility model: First, the worker inserts the rivet 1 into the through hole 11, placing the composite material and metal plate between the pressure ring 6 and the cutting die 8, pressing the composite material and metal plate together. Then, the punch 7 is inserted into the through hole 11 and driven downwards. The punch 7 impacts and penetrates the composite material and metal plate through the rivet 1, causing the blanking waste to enter the circular groove 9 and squeeze the floating support die 13. After blanking, the metal plate will be riveted to the rivet 1 through the interlocking groove 4. During riveting, the worker increases the downward pressure of the pressure ring 6 on the composite material and metal plate, causing the middle part of the bottom end of the metal plate to be squeezed and deformed by the cutting boss 10, thus ensuring that the back of the metal plate is flat and without protrusions, thereby realizing the riveting of the composite material and metal plate. After completion, the upper die assembly and the material plate are removed. Under the elastic force of the spring 12, the floating support die 13 will push out the blanking waste. This solution not only eliminates the hole-opening process and solves the hole-alignment problem, but also ensures that the back of the metal plate is flat and without protrusions, avoiding interference between the metal plate and the underlying structural components.

[0035] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A rivet for riveting composite materials to metal plates, including a rivet shank (1), characterized in that: The rivet (1) has a flange (2) at the top and a self-punching end (3) at the bottom. The bottom of the self-punching end (3) is horizontal. An interlocking groove (4) is opened on the outer surface of the rivet (1) above the self-punching end (3). The interlocking groove (4) surrounds the outer surface of the rivet (1).

2. The rivet for riveting composite materials to metal plates according to claim 1, characterized in that: The diameter of the flange (2) is larger than the diameter of the rivet (1), and the flange (2) is provided with a head tilt angle (5) at the end facing the rivet (1).

3. A flat-bottomed riveting device for riveting composite materials to metal plates, comprising the rivets for riveting composite materials to metal plates as described in any one of claims 1-2, characterized in that: It also includes an upper die assembly and a lower die assembly for clamping and punching sheet. The upper die assembly includes a pressure ring (6) and a punch (7). The lower die assembly includes a cutting die (8). A circular groove (9) is provided on the cutting die (8). A top material assembly is provided inside the circular groove (9) for discharging punching waste. A cutting boss (10) is provided on the top of the cutting die (8).

4. The flat-bottom riveting device for riveting composite materials to metal plates according to claim 3, characterized in that: The pressure ring (6) has a through hole (11) in the middle, and the punch (7) is movably inserted into the through hole (11) and the diameter of the punch (7) is adapted to the inner diameter of the through hole (11).

5. The flat-bottom riveting device for riveting composite materials to metal plates according to claim 3, characterized in that: The top material assembly includes a spring (12), one end of which is fixedly connected to the inner wall of the circular groove (9), and the other end of which is fixedly connected to a floating support mold (13), which is movably installed inside the circular groove (9).

6. The flat-bottom riveting device for riveting composite materials to metal plates according to claim 3, characterized in that: The cutting boss (10) is arranged around the edge of the top of the circular groove (9), and the cutting boss (10) is coaxial with the circular groove (9).

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