CN204234651U - Thin plate self-locking is solidly connected system - Google Patents

Abstract

Sheet self-locking fastening connection system, the connection system has a self-locking rivet with a cylindrical rod with a pointed ring at the lower end, a blank holder outside the rivet, a connected sheet and a die with an annular groove underneath; There are 2-3 layers of thin plates: the elongation rate of the bottom layer is ≥12%; the thickness and strength gradually decrease from the bottom layer to the top layer; the thickness of the bottom layer is greater than 1/3 of the total thickness. Start the self-locking riveting tool, firstly drive the hammer and blankholder to pre-compress the thin plate, continue to pressurize the self-locking rivet to pierce the upper thin plate, and make the lower thin plate plastically deform into the annular groove; then expand to form a mechanical self-locking riveting riveting tool. lock structure. Solved the connection problem that the thin plate cannot be spot welded. Punching and riveting can be completed at one time, with high efficiency, and the cycle of connecting a rivet is only 3 seconds. There is no smoke, steam, sparks, dust, debris, and noise during production, which meets the needs of automotive lightweight materials, connections, large-scale automated production, and excellent environmental protection. It can be used for fastening connections between thin aluminum plates, metals and non-metals, painted or plated ferrous metals, etc.

Description

Thin plate self-locking fastening connection system

(1) Technical field: The thin plate self-locking fastening connection system of the utility model is mainly used for the fastening connection between ferrous metals, non-metals, painted, plated, and poor weldability thin plates on automobiles. It belongs to riveting (B21J) and fasteners (F16B) of metal machining.

(two) background technology:

When the existing automobile body is made of steel plates, the main method of connecting the plates is still spot welding (resistance welding), which is not only conducive to mass production, but also has a firm and reliable connection quality.

With the development of the automobile industry, the requirements for the lightweight of automobiles are getting higher and higher. Automobile manufacturers pay more attention to the lightweight of the body and the high quality of material connections. One of the main ways to reduce the weight of the body is to use lightweight materials. For example, light-weight thin aluminum plates (non-ferrous metals) are used, but it is very difficult to connect light-weight thin aluminum plates with spot welding.

In addition, spot welding is also very difficult to connect between metal and non-metal, between non-metal, between plates with poor weldability, and between painted or plated ferrous metals.

If the traditional riveting technology is used for the connection between the thin aluminum plates, the plates to be connected must first be pre-punched and then riveted, which is inefficient.

(3) Contents of the invention:

The purpose of the self-locking fastening connection system for thin plates proposed by the utility model is to solve the problem of connection between light thin plates that cannot be spot welded and to optimize the fastening connection. And meet the needs of manufacturing lightweight vehicles. Lightweight thin plates include non-ferrous metals, metals and non-metals, non-metals, plates with poor weldability, and ferrous metals with paint or plating.

Its technical scheme is as follows:

Thin plate self-locking fastening connection system, characterized by

1) A self-locking rivet 3 composed of a head 3.1 and a shank 3.2 is set. The shank is a cylinder with a smooth surface on the outside, and the front end of the inner hole of the cylinder is a pointed ring 3.3; the head is a countersunk head or a flat head department. 2) When connecting, set the cylindrical blank holder 4 outside the self-locking rivet; and set the die 1 placed under the connected thin plate 2; there is an annular groove 1.1 above the die. 3) Set the direction of self-locking The rivet exerts pressure and is driven by a self-locking riveting tool 6. The hammer 5, the blank holder 4 is set on the outer circle of the hammer, and there is a transitional fit between the two. 4) The connected sheet has 2-3 layers; the elongation of the lower sheet 2.1 is ≥12%; the thickness and strength of the lower sheet to the upper sheet gradually decrease; the thickness of the lower sheet is greater than the total thickness of the connected sheet one-third of.

Working principle: In the above thin plate self-locking fastening connection system, the hammer 5 driven by the self-locking riveting tool 6 presses down the self-locking rivet 3, so that the pointed ring pierces the upper thin plate, and the lower thin plate undergoes plastic deformation toward the annular groove , continue to pressurize, the lower sheet fills the annular groove, the rod expands around, and presses until the head is flush with the surface of the upper sheet, forming a mechanical self-locking structure 3A between the self-locking rivet and the sheet, and stopping the pressurization to complete A self-locking fastening of sheets with a self-locking rivet.

Beneficial effects of the utility model:

1) Solve the connection problems between non-ferrous metals (such as thin aluminum plates), between metals and non-metals, between non-metals, between plates with poor weldability, and between painted or plated ferrous metals (except for fragile plates, such as glass board, brittle plastic board, etc.). It opens up a new way for the use of new lightweight materials and connections for automobile bodies. 2) The thin plate self-locking fastening connection system overcomes the disadvantages of traditional riveting, and realizes punching and riveting at one time, which makes the processing process simple and greatly improves work efficiency. Usually, the cycle of connecting a self-locking rivet is only 3 seconds, especially suitable for automobile body manufacturing The demand for this large-scale automated production. 3) The connected thin plate can be adapted to plates of various materials and multi-layer plate groups: A. High-strength steel plate. B. Aluminum alloy plate. C plastic board. D. Composite sandwich panels. 4) This system can be used for the cold forming process of connecting two or more layers of boards. Compared with the resistance spot welding process, there is no thermal effect first, so the paint or plating will not be damaged during the connection. At the same time, the advantages of no smoke, steam, sparks, dust, debris, noise, etc. during production greatly improve the process safety and the cleanliness of the working environment, reduce the harm to the staff's body, and are environmentally friendly and in line with the future. The development trend of green industry, so it has broad application prospects in the automobile industry. 5) The strength of the riveting point is high. 6) Stable riveting quality, controlled by the following methods: First, the quality of the riveting point is determined by visual observation, that is, whether the height of the rivet head and the shape of the riveting self-locking structure are normal. The second is to manage and control the riveting quality by detecting the riveting force-displacement curve with riveting tools.

7) The head shape of self-locking rivets can be divided into two types: countersunk head and flat head. Countersunk head self-locking rivets are mainly used for fastening connections between metal sheets. The flat head is mainly used for fastening connections between non-metal and metal, non-metal and non-metal thin plates.

(4) Description of drawings

Fig. 1 Schematic diagram of the overall layout and structure of the thin-plate self-locking fastening connection system. It is also a diagram of the first, second and third steps of the thin plate self-locking fastening connection method.

Fig. 2 is a sectional view of the self-locking rivet 3. (counter-sunk head)

Figure 3 Schematic view of the flat head.

Figure 4 is a diagram of the stamping stage of the fourth step.

Figure 5. Schematic diagram of the expansion stage of the fifth step.

Figure 6 is a schematic diagram of the sixth step of self-locking riveting tool stop pressurization stage.

Figure 7 is a diagram of the completion of the seventh step of tightening the connection.

(5) Specific implementation methods

The thin plate self-locking fastening connection system of this embodiment is composed as follows:

As shown in Figure 2, a self-locking rivet 3 composed of a head 3.1 and a shank 3.2 is assumed. The shank is a cylinder with a polished surface on the outside, the front end of the inner hole of the cylinder is a pointed ring 3.3, and the head 3.1 is a countersunk head. . See Figure 3, the head 3.1a is a flat head.

As shown in Fig. 1, when connecting, set the cylindrical blank holder 4 that is set outside the self-locking rivet 3; and set the die 1 placed under the connected thin plate 2, and there is a circular groove 1.1 above the die. It is provided that a hammer 5 is applied to the self-locking rivet and driven by a self-locking riveting tool 6, and a blank holder 4 is set on the outer circle of the hammer, and there is a transitional fit between the two.

As shown in Figure 1, there are 2 layers of connected thin plates in this embodiment: the material of the lower thin plate 2.1 is carbon steel, the thickness is 2 mm, the strength is 360 MPa, and the elongation rate is ≥ 12%; the material of the upper thin plate 2.2 is aluminum alloy, the thickness is 1.5 mm, the strength is is 230MPa. It can be seen that the thickness and strength of the lower thin plate gradually decrease from the lower thin plate to the upper thin plate; and the thickness of the lower thin plate 2.1 is greater than one-third of the total thickness of the connected thin plate 2 .

The thin plate self-locking fastening connection method in this embodiment includes the following steps:

The first step: make the above-mentioned sheet self-locking fastening connection system. See Figures 1-3.

The second step: see Fig. 1, after making the above thin plate self-locking fastening connection system and before fastening the connection, the surface of the self-locking rivet 3 is firstly polished, galvanized, tinned or sprayed for surface treatment. Then place the connected thin plate 2 between the hammer 5 and the die 1, the self-locking rivet 3 is placed on the surface of the connected thin plate 2.2 under the hammer 5 through mechanical belt transmission, and the blank holder 4 is set on the self-locking Rivets outside. The mechanical belt conveyor is rotated by the ratchet 3a driven by external power, and the self-locking rivets 3 neatly arranged on the rivet belt 3b are sent one by one to the surface of the upper thin plate 2.1 under the hammer 5 to be in place.

The third step of clamping stage: see Figure 1, start the self-locking riveting tool 6, drive the hammer 5 and pre-press the upper thin plate 2.2 vertically downward through the self-locking rivet 3, and the blank holder 4 also follows the hammer 5 Press the connected sheet 2 down.

The fourth stamping stage: see Figure 4, the self-locking riveting tool 6 continues to press down on the self-locking rivet 3 through the punch 5, and the pointed ring 3.3 of the rod pierces the upper sheet 2.2, and at the same time drives the lower sheet 2.1 to The annular groove 1.1 in the die 1 is plastically deformed.

The fifth step of expansion stage: see Fig. 5 to continue pressure riveting, the lower thin plate 2.1 gradually fills the annular groove 1.1, and under the joint action of the rod and the annular groove, the rod 3.2 expands around.

The sixth step is to stop the pressurization stage of the riveting tool: see Figure 6, when the self-locking rivet is pressed down until the head 3.1 is flush with the upper surface of the upper sheet 2.2, and is in close contact with the concave part to form a mechanical bond between the self-locking rivet and the sheet. When the self-locking structure is 3A, the self-locking riveting tool 6 stops pressurization.

The seventh step is to complete the fastening connection: see Figure 7, the self-locking riveting tool 6 moves up and returns to the initial station, and the blank holder 4 and the hammer 5 move up and back to their positions at the same time, completing the fastening connection of a self-locking rivet.

Claims (1)

1. Thin plate self-locking fastening connection system, characterized by: 1) Set a self-locking rivet (3) consisting of a head (3.1) and a shank (3.2). The shank is a cylinder with a polished surface on the outside, and the front end of the inner hole of the cylinder is a pointed ring (3.3); the head Use countersunk head or flat head; 2) When connecting, set the cylindrical blank holder (4) that is set outside the self-locking rivet; and set the die (1) under the connected thin plate (2); there is an annular groove (1.1) above the die ); 3) The hammer (5) is set to apply pressure to the self-locking rivet and is driven by the self-locking riveting tool (6), and the blank holder is set on the outer circle of the hammer, and there is a transitional fit between them; 4) The connected sheets are 2-3 layers; the elongation rate of the bottom sheet (2.1) is ≥12%; the thickness and strength of the bottom sheet (2.1) to the top sheet (2.2) gradually decrease; The thickness of the thin plate is greater than one-third of the total thickness of the connected thin plate.