Rotary friction self-piercing riveting device

Abstract

The utility model discloses a rotary friction self-piercing riveting device, and relates to the technical field of self-piercing riveting. Comprising a rack, a rivet pressing mechanism and a power device, the riveting machine further comprises a rotary friction mechanism and a sliding platform mechanism, the rotary friction mechanism is arranged on the rack, the rotary friction mechanism and the riveting mechanism are arranged side by side, and the rotary friction mechanism is provided with a stirring head used for rotary friction. The sliding platform mechanism is arranged on the rack and opposite to the rivet pressing mechanism, the sliding platform mechanism comprises a sliding table, a sliding support, a workpiece fixing device and a driving device, the sliding table is fixed to the rack, the sliding support is arranged on the sliding table in a sliding mode, and a clamping groove piece is arranged in the middle of the sliding support; the upper end face of the sliding support is parallel to the upper end face of the female die. According to the utility model, the rotary friction mechanism and the rivet pressing mechanism are arranged on the rack side by side, and the workpiece is switched between the rotary friction mechanism and the rivet pressing mechanism by utilizing the sliding platform mechanism, so that rotary friction heating and rivet pressing operations are efficiently and accurately completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-piercing riveting, in particular to a rotary friction self-piercing riveting device. Background Art

[0002] In the field of riveting and welding technology for metal materials, with the widespread application of lightweight metal materials such as magnesium alloys and aluminum alloys in the fields of lightweight automobiles, the connection technology between dissimilar alloys has become the key. However, the high electrical and thermal conductivity of lightweight alloys and the easy formation of oxide layers during welding make resistance welding and stir friction welding technologies face difficulties in connecting lightweight alloys. Self-piercing riveting technology is limited by the poor cold deformation ability of magnesium alloys, and it is difficult to achieve point-fixed connection of magnesium alloy plates or point-fixed connection of magnesium alloys and aluminum alloys. Friction stir spot welding technology forms a hole in the center of the sheet point-fixed joint, resulting in an insufficiently strong joint here. Although bonding technology is not limited by material variety and can achieve large-area connection, giving the joint higher fatigue and shear strength, it has poor high temperature resistance and is prone to aging, resulting in reduced mechanical properties of the joint.

[0003] In addition, some patents related to rotary friction riveting have been disclosed, such as "self-piercing friction riveting connection device", "a stir friction riveting device and riveting method", "a stir friction riveting device and riveting method for light metal sheets", and "a rotary friction riveting method for metal sheets". They use a driving device to rotate and rub the semi-hollow rivet against the sheet to be riveted, and use friction heat to soften the sheet to achieve mechanical interlocking. However, these methods have some problems, such as the rivet is prone to stirring in the sheet, which affects the mechanical properties of the riveted joint, and has high requirements on the stability of the driving pin and rivet rotation and the rivet processing accuracy, and some rivets have complex structures.

[0004] Therefore, a rotary friction self-piercing riveting device with a relatively simple structure is needed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects and propose a rotary friction self-piercing riveting device; by arranging a rotary friction mechanism and a pressure riveting mechanism side by side on a frame, and using a sliding platform mechanism to achieve precise switching of the workpiece between the two, the purpose of efficiently, stably and accurately completing the rotary friction heating and pressure riveting operations is achieved, and the requirements of different workpieces for high-quality riveting processes are met.

[0006] The specific technical solutions are as follows:

[0007] A rotary friction self-piercing riveting device comprises a frame, a riveting mechanism and a power device; it also comprises a rotary friction mechanism and a sliding platform mechanism, the rotary friction mechanism is arranged on the frame and arranged side by side with the riveting mechanism, the rotary friction mechanism is provided with a stirring head for rotary friction; the sliding platform mechanism is arranged on the frame and opposite to the riveting mechanism, the sliding platform mechanism comprises a sliding platform, a sliding bracket, a workpiece fixing device and a driving device, the sliding platform is fixed on the frame, the sliding bracket is slidably arranged on the sliding platform, a slot piece is provided in the middle of the sliding bracket, so that the die on the frame is located in the slot piece of the sliding bracket and the upper end surface of the sliding bracket is parallel to the upper end surface of the die; a driving device is provided between the sliding platform and the sliding bracket, so that the sliding bracket can move relative to the riveting mechanism and the rotary friction mechanism; the workpiece fixing device is a negative pressure suction cup connected to a negative pressure generating device, and the negative pressure suction cup is provided on the sliding bracket and faces the workpiece.

[0008] Furthermore, in the above scheme, the sliding bracket is a U-shaped structure.

[0009] Furthermore, in the above scheme, a limit block is provided at one end of the U-shaped structure of the sliding bracket, and the limit block forms a limit with a fixed block arranged on the sliding platform to limit the limit block of the sliding bracket from sliding over the fixed block.

[0010] Furthermore, in the above scheme, the negative pressure suction cup is arranged at the non-U-shaped opening end of the U-shaped structure of the sliding bracket.

[0011] Furthermore, in the above scheme, the track on the sliding platform corresponding to the sliding bracket is in an arc shape, so that the sliding bracket slides along the arc.

[0012] Furthermore, in the above scheme, the negative pressure suction cup is connected to the spherical surface of the sliding bracket.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] The utility model realizes the orderly progress of the process steps by arranging the rotating friction mechanism and the pressure riveting mechanism side by side and cooperating with the sliding platform mechanism, thereby improving the production efficiency.

[0015] The U-shaped structural design of the sliding bracket of the utility model is convenient for placing and fixing the workpiece, and the arrangement of the clamping groove makes the cooperation between the die and the sliding bracket tighter, thereby ensuring the processing accuracy.

[0016] The setting of the limit block of the utility model limits the moving range of the sliding bracket, prevents the sliding bracket from excessively sliding, and improves the safety and stability of the device.

[0017] The negative pressure suction cup of the utility model serves as a workpiece fixing device and can firmly absorb the workpiece, thereby ensuring that the workpiece does not move during the processing and improving the riveting quality.

[0018] The design of the arc-shaped track on the sliding table of the utility model and the spherical connection between the negative pressure suction cup and the sliding bracket increase the flexibility and stability of the sliding bracket movement and meet the processing requirements of workpieces of different shapes and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the principle of pressure riveting in the prior art;

[0020] Figure 2 It is a schematic diagram of the structure of a workpiece after riveting in the prior art;

[0021] Figure 3 This is a schematic diagram of the structure of the sliding platform mechanism of the utility model;

[0022] Figure 4 yes Figure 3 Schematic diagram of the cross-section structure.

[0023] In the accompanying drawings, 1-pressure riveting mechanism, 2-workpiece, 3-rivet, 4-die, 5-frame, 6-sliding table, 7-sliding bracket, 8-slot part, 9-driving motor, 10-gear, 11-negative pressure suction cup. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the embodiments of the invention in conjunction with the accompanying drawings to make the objectives, technical solutions and technical effects of the invention more clearly presented.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1-2 As shown, it is a schematic diagram of the principle of prior art riveting. The riveting equipment performs press riveting on two layers of thin plate workpieces 2. During the process, the self-piercing rivet 3 is first placed in the position to be riveted, and then through the steps of pre-pressing, piercing, expanding and embedding, the riveting point is finally formed by maintaining pressure.

[0027] like Figure 3-4As shown, the utility model discloses a rotary friction self-piercing riveting device, comprising a frame 5, a riveting mechanism 1 and a power device; it also comprises a rotary friction mechanism and a sliding platform mechanism, the rotary friction mechanism is arranged on the frame 5 and arranged side by side with the riveting mechanism 1, and the rotary friction mechanism is provided with a stirring head for rotary friction.

[0028] The sliding platform mechanism is arranged on the frame 5 and is opposite to the riveting mechanism 1. The sliding platform mechanism includes a sliding platform 6, a sliding bracket 7, a workpiece fixing device and a driving device. The sliding platform 6 is fixed on the frame 5. The sliding bracket 7 is slidably arranged on the sliding platform 6. A slot 8 is arranged in the middle of the sliding bracket 7, so that the die 4 on the frame 5 is located in the slot 8 of the sliding bracket 7 and the upper end surface of the sliding bracket 7 is parallel to the upper end surface of the die 4; the slot 8 is provided with a semicircular groove for corresponding insertion of the die 4; the slot 8 serves as a workpiece transfer platform and also as a support platform for the corresponding rotating friction mechanism. A driving device is arranged between the sliding platform 6 and the sliding bracket 7 so that the sliding bracket 7 can move between the riveting mechanism 1 and the rotating friction mechanism relative to the riveting mechanism 1. The driving device includes a driving motor 9 and a gear 10. The gear 10 corresponds to the rack on the sliding bracket 7. The driving motor 9 is installed on the sliding platform 6. The workpiece fixing device is a negative pressure suction cup 11 connected to the negative pressure generating device. The negative pressure suction cup 11 is arranged on the sliding bracket 7 and faces the workpiece 2. The sliding bracket 7 is a U-shaped structure; a limit block is provided at one end of the U-shaped structure of the sliding bracket 7, and the limit block forms a limit with a fixed block provided on the sliding platform 6, which is used to limit the limit block of the sliding bracket 7 from sliding over the fixed block. A negative pressure suction cup 11 is provided at the non-U-shaped opening end of the U-shaped structure of the sliding bracket 7; the negative pressure suction cup 11 is spherically connected to the sliding bracket 7.

[0029] Furthermore, in the above solution, the track on the sliding platform 6 corresponding to the sliding bracket 7 is in an arc shape, so that the sliding bracket 7 slides along the arc.

[0030] The stirring head of the rotary friction mechanism performs friction heating on a specific area of ​​the workpiece 2 to be riveted by high-speed rotation, thereby softening the material. The driving device in the sliding platform mechanism drives the sliding bracket 7 to move linearly on the sliding platform 6, thereby switching the workpiece 2 between the rotary friction mechanism and the riveting mechanism 1. After the workpiece 2 is heated at the rotary friction mechanism, the sliding bracket 7 moves the workpiece 2 to the riveting mechanism 1, and the riveting mechanism 1 performs a riveting operation on the softened workpiece 2 to complete the riveting process. Specifically, when the workpiece 2 is moved to the rotating friction mechanism, the stirring head of the rotating friction mechanism rotates at a high speed, rubbing against the surface of the workpiece 2 to generate heat, so that the material of the workpiece 2 to be riveted is softened; the sliding bracket 7 continues to move, and brings the heated workpiece 2 to the riveting mechanism 1; at this time, the riveting mechanism 1 starts to work and performs riveting operations on the softened workpiece 2; during the riveting process, the punch of the riveting mechanism 1 moves downward to punch the rivet 3 into the workpiece 2; because the material of the workpiece 2 has been softened, the rivet 3 can penetrate the workpiece 2 more easily, and under the action of the die 4, the tail of the rivet 3 expands and deforms to form a mechanical interlocking structure, thereby firmly connecting the workpiece 2 together. The negative pressure suction cup 11 generates adsorption force by connecting the negative pressure generating device, fixes the workpiece 2 on the sliding bracket 7, and ensures the stability of the workpiece 2 during movement and processing.

[0031] The steps based on the above scheme include:

[0032] (1) Place the workpiece 2 to be riveted in the U-shaped structure of the sliding bracket 7 to ensure that the workpiece 2 is in close contact with the negative pressure suction cup 11.

[0033] (2) The negative pressure generating device is started, and the negative pressure suction cup 11 absorbs the workpiece 2 so that it is firmly fixed on the sliding bracket 7.

[0034] (3) The rotary friction mechanism is started, and the stirring head rotates at high speed to perform rotary friction heating on the area to be processed of the workpiece 2.

[0035] (4) After the heating is completed, the driving device drives the sliding bracket 7 to move along the arc-shaped track on the sliding table 6, and switches the workpiece 2 from the rotating friction mechanism to the riveting mechanism 1. During the movement, the limit block at one end of the U-shaped structure of the sliding bracket 7 interacts with the fixed block on the sliding table 6 to limit the movement range of the sliding bracket 7 and prevent it from sliding over the fixed block.

[0036] (5) When the workpiece 2 reaches the position of the riveting mechanism 1, the riveting mechanism 1 performs a riveting operation on the softened workpiece 2 to complete the riveting.

[0037] (6) After riveting is completed, turn off the negative pressure generating device and the power source of each mechanism, and remove the riveted workpiece 2.

[0038] The above description is only a preferred feasible embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, equivalent substitutions or modified changes performed within the technical spirit and principles suggested by the present invention should be included in the scope of patent protection covered by the present invention.

Claims

1. A rotary friction self-piercing riveting device, comprising a frame, a riveting mechanism and a power device; characterized in that: It also includes a rotating friction mechanism and a sliding platform mechanism, the rotating friction mechanism is arranged on the frame and arranged side by side with the riveting mechanism, the rotating friction mechanism is provided with a stirring head for rotating friction; the sliding platform mechanism is arranged on the frame and opposite to the riveting mechanism, the sliding platform mechanism includes a sliding table, a sliding bracket, a workpiece fixing device and a driving device, the sliding table is fixed on the frame, the sliding bracket is slidably arranged on the sliding table, a slot piece is provided in the middle of the sliding bracket, so that the die on the frame is located in the slot piece of the sliding bracket and the upper end surface of the sliding bracket is parallel to the upper end surface of the die; a driving device is provided between the sliding table and the sliding bracket, so that the sliding bracket can move relative to the riveting mechanism and the rotating friction mechanism; the workpiece fixing device is a negative pressure suction cup connected to a negative pressure generating device, and the negative pressure suction cup is provided on the sliding bracket and faces the workpiece.

2. A rotary friction self-piercing riveting device according to claim 1, characterized in that: The sliding bracket is a U-shaped structure.

3. A rotary friction self-piercing riveting device according to claim 2, characterized in that: A limit block is provided at one end of the U-shaped structure of the sliding bracket, and the limit block forms a limit with a fixed block arranged on the sliding platform, which is used to limit the limit block of the sliding bracket from sliding over the fixed block.

4. A rotary friction self-piercing riveting device according to claim 1, characterized in that: The negative pressure suction cup is arranged at the non-U-shaped opening end of the U-shaped structure of the sliding bracket.

5. The rotary friction self-piercing riveting device according to claim 1, characterized in that: The track on the sliding platform corresponding to the sliding bracket is in an arc shape, so that the sliding bracket slides along the arc.

6. The rotary friction self-piercing riveting device according to claim 1, characterized in that: The negative pressure suction cup is connected to the spherical surface of the sliding bracket.

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