Low-frequency vibration self-piercing riveting equipment and riveting system using same

Abstract

The invention relates to the technical field of self-piercing riveting, and provides low-frequency vibration self-piercing riveting equipment and a riveting system using the low-frequency vibration self-piercing riveting equipment. Comprising a support which is provided with a first installation area and a second installation area; an oil cylinder assembly is arranged in the first installation area, a push rod in the oil cylinder assembly is connected with a riveting assembly through an oil cylinder lower end cover, and the riveting assembly is connected with a vibration assembly through a riveting main shaft. An eccentric friction wheel in the vibration assembly is matched with the driven friction wheel, a vibration main shaft is sleeved with the eccentric friction wheel, and the vibration main shaft is in transmission connection with a driving device; the riveting main shaft is sleeved with the driven friction wheel, and a punch is arranged at the output end of the riveting main shaft; and a female die is arranged in the second mounting area. The riveting device has the beneficial effects that when the riveting device is used, the riveting main shaft vibrates up and down in a reciprocating mode under rotation driving of the eccentric friction wheel. And the self-piercing riveting process under different vibration parameters can be realized by changing the shape of the cam of the eccentric friction wheel and adjusting the power of the driving motor.

Description

Technical Field

[0001] The present invention relates to the technical field of self-piercing riveting, and particularly to a low-frequency vibration self-piercing riveting device and a riveting system using the same. Background Art

[0002] At present, high-performance lightweight materials such as aluminum alloys and carbon fiber composites have been widely used in the automotive and aerospace fields. As a mechanical connection process using semi-hollow rivets to connect the same or heterogeneous materials, the principle of self-piercing riveting is to use a semi-hollow rivet to pierce the upper plate and the lower plate in sequence at room temperature, and the rivet legs bend and expand outward in the lower plate, thereby forming a stable mechanical interlock structure to achieve the connection of the plates. Compared with traditional riveting, it does not require pre-drilled holes, has high connection efficiency, and the joint has the characteristics of high strength and long service life, so it is widely used in the mechanical connection of lightweight and high-strength materials.

[0003] However, due to the strong brittleness of carbon fiber composites themselves, during the self-piercing riveting process, the piercing action of the rivet will cause irreversible damage such as interlayer separation and fiber fracture inside the carbon fiber composite, greatly reducing the connection strength and service life of the joint. At the same time, the high-strength riveting plate will also cause greater deformation resistance to the rivet legs during the outward expansion process, resulting in a smaller bite amount between the rivet and the riveting plate, and it is difficult to achieve high-quality interlocking.

[0004] The existing self-piercing riveting devices mainly focus on the adjustment of the structure of the self-piercing riveting equipment, but the driving method still uses traditional electric servo drive and hydraulic drive, with low energy utilization rate of the equipment, and the performance of the rivet after forming cannot be further improved.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-frequency vibration self-piercing riveting device and a riveting system using the same to solve the technical problems existing in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a low-frequency vibration self-piercing riveting device, including: a bracket, and the bracket is provided with a first installation area and a second installation area;

[0008] An oil cylinder assembly is arranged in the first installation area, the push rod in the oil cylinder assembly is connected to a riveting assembly through a lower end cover of the oil cylinder, and the riveting assembly is connected to a vibration assembly through a riveting main shaft;

[0009] The eccentric friction wheel in the vibration assembly cooperates with the driven friction wheel, the eccentric friction wheel is sleeved on a vibration main shaft, and the vibration main shaft is in transmission connection with a driving device;

[0010] The driven friction wheel is sleeved on the riveting main shaft, and a punch is arranged at the output end of the riveting main shaft;

[0011] A female die is arranged in the second installation area.

[0012] In an alternative embodiment, the bracket is a C-shaped frame.

[0013] In an alternative embodiment, the push rod is arranged in the oil cylinder housing of the oil cylinder assembly. An oil inlet and an oil outlet are arranged on the oil cylinder housing, and an upper end cover of the oil cylinder is arranged at the top of the oil cylinder housing;

[0014] The push rod is in driving connection with the lower end cover of the oil cylinder, and the lower end cover of the oil cylinder moves synchronously with the push rod.

[0015] In an alternative embodiment, the main housing of the riveting assembly is fixedly connected to the lower end cover of the oil cylinder. A first spring is arranged in the main housing, and the first spring is sleeved on the riveting main shaft;

[0016] One end of the first spring is connected to the main housing, and the other end of the first spring is connected to the flange of the riveting main shaft.

[0017] In an alternative embodiment, a main housing end cover is arranged at the bottom of the main housing, and the punch of the riveting main shaft penetrates through the main housing end cover; a second spring is further arranged inside the main housing, and the second spring is sleeved on the riveting main shaft;

[0018] One end of the second spring is connected to the driven friction wheel, and the other end of the second spring is connected to the inner surface of the main housing end cover.

[0019] In an alternative embodiment, one end of a third spring is connected to the outer surface of the main housing end cover, and the other end of the third spring is connected to a blank holder ring;

[0020] The blank holder ring is sleeved on the punch.

[0021] In an alternative embodiment, the vibration main shaft is arranged in the side housing, and the side housing is connected to the main housing; the vibration main shaft is arranged in the side housing and extends into the main housing.

[0022] In an alternative embodiment, a sleeve is rotatably arranged in the side housing, and a left end cover and a right end cover are respectively arranged at both ends of the sleeve;

[0023] The vibration main shaft is connected to the sleeve through a spacer block inside the sleeve, and the driving end of the vibration main shaft extends out of the right end cover.

[0024] In an alternative embodiment, a cover is arranged at one end of the side housing away from the main housing, and the transmission shaft of the left end cover penetrates through the cover;

[0025] The transmission shaft of the left end cover is drivingly connected to the output shaft of the driving device, and the driving device is fixedly arranged on the side housing.

[0026] On the other hand, the present invention also provides a riveting system, including: using the low-frequency vibration self-piercing riveting device as described above.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) When the device is in use, driven by the rotation of the eccentric friction wheel on the vibration main shaft, the riveting main shaft vibrates up and down reciprocally. The self-piercing riveting process under different vibration parameters can be realized by changing the cam shape of the eccentric friction wheel and adjusting the power of the driving motor.

[0029] (2) By arranging the eccentric friction wheel to convert the rotation of the driving device into the up and down reciprocating vibration of the riveting main shaft, and cooperating with the first and second springs, the rapid reset of the riveting main shaft after descending can be realized, the vibration frequency is increased, and the riveting effect of the workpiece is improved; in addition, the blank holder acts on the workpiece, and its cooperation with the third spring can ensure that the position of the workpiece does not move before the punch fully contacts the workpiece. In particular, it should be noted that the cooperation of the blank holder and the third spring can also ensure the flatness of the workpiece (the riveted plate) during the riveting process. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic diagram of the overall structure of the low-frequency vibration self-piercing riveting device provided by an embodiment of the present invention.

[0032] Figure 2 It is a cross-sectional view of the overall structure of the low-frequency vibration self-piercing riveting device provided by an embodiment of the present invention.

[0033] Figure 3 For Figure 2 a partial enlarged structural schematic diagram at position A in

[0034] Among them, the reference numerals in the figure are: 1 - oil cylinder assembly, 11 - oil cylinder housing, 12 - upper end cover of the oil cylinder, 13 - push rod, 14 - lower end cover of the oil cylinder; 2 - bracket, 21 - first installation area, 22 - second installation area; 3 - riveting assembly, 31 - main housing, 32 - riveting main shaft, 33 - end cover of the main housing, 34 - punch, 35 - blank holder, 36 - first spring, 37 - second spring, 38 - second spring; 4 - vibration assembly, 41 - side housing, 42 - sleeve, 43 - cover, 44 - left end cover, 45 - spacer, 46 - vibration main shaft, 47 - right end cover, 48 - eccentric friction wheel, 49 - driven friction wheel; 5 - female die. Detailed implementation manners

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly located on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the accompanying drawings, and are only for the convenience of description and cannot be construed as limitations on the technical solutions of the present application. The terms "first" and "second" are only used for the purpose of convenient description and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, and the meaning of "several" is any quantity including one, unless otherwise specifically defined.

[0037] Please refer to the attached Figures 1-3The purpose of this embodiment is to provide a low-frequency vibration self-piercing riveting equipment, which is characterized by comprising: a bracket 2, the bracket 2 is a C-shaped bracket, and the bracket 2 is provided with a first installation area 21 and a second installation area 22; a cylinder assembly 1 is provided in the first installation area 21, and the push rod 13 in the cylinder assembly 1 is connected to the riveting assembly 3 through the lower end cover 14 of the cylinder, and the riveting assembly 3 is connected to the vibration assembly 4 through the riveting spindle 32; the eccentric friction wheel 48 in the vibration assembly 4 cooperates with the driven friction wheel 49, the eccentric friction wheel 48 is sleeved on the vibration spindle 46, and the vibration spindle 46 is transmission-connected to the driving device; the driven friction wheel 49 is sleeved on the riveting spindle 32, and a punch 34 is provided at the output end of the riveting spindle 32; a die 5 is provided in the second installation area 22. It should be pointed out that the eccentric friction wheel 48 is a cam structure, which cooperates with the driven friction wheel 49 to realize the up and down reciprocating vibration of the riveting spindle 46, and the eccentric friction wheel 48 is replaceable. It can be replaced with an eccentric friction wheel 48 with a cam of a different shape. The self-piercing riveting process under different vibration parameters can be realized by changing the cam shape of the eccentric friction wheel 5 and adjusting the power of the driving device.

[0038] Specifically, the push rod 13 is arranged in the oil cylinder housing 11 of the oil cylinder assembly 1, the oil cylinder housing 11 is provided with an oil inlet and an oil outlet, and the top of the oil cylinder housing 11 is provided with an oil cylinder upper end cover 12; the push rod 13 is transmission-connected with the oil cylinder lower end cover 14, and the oil cylinder lower end cover 14 moves synchronously with the push rod 13. The main housing 31 of the riveting assembly 3 is fixedly connected with the oil cylinder lower end cover 14. The riveting assembly 3 and the vibration assembly 4 can be pushed out to a predetermined position through the oil cylinder assembly 1.

[0039] Further, a first spring 36 is provided in the main housing 31, and the first spring 36 is sleeved on the riveting spindle 32; one end of the first spring 36 is connected to the main housing 31, and the other end of the first spring 36 is connected to the flange of the riveting spindle 32. The riveting spindle 32 can be reset by the first spring 36 after one vibration; a main housing end cover 33 is provided at the bottom of the main housing 31, and the punch 34 of the riveting spindle 32 passes through the main housing end cover 33; a second spring 37 is also provided inside the main housing 31, and the second spring 37 is sleeved on the riveting spindle 32; one end of the second spring 37 is connected to the driven friction wheel 49, and the other end of the second spring 37 is connected to the inner surface of the main housing end cover 33. The driven friction wheel 49 can be reset by the second spring 37 after one vibration. It should be noted that under the joint action of the first spring 36 and the second spring 37, the reset speed of the driven friction wheel 49 and the riveting spindle 32 is improved, which helps to improve the riveting effect.

[0040] In this embodiment, one end of a third spring 38 is connected to the outer surface of the main housing end cover 33, and the other end of the third spring 38 is connected to a blank holder 35; the blank holder 35 is sleeved on a punch 34. The punch 34, the female die 5 and the blank holder 35 act together on the workpiece to quickly complete riveting. The blank holder 35 acts on the workpiece, and the third spring 38 is compressed to provide a certain acting force to ensure that the position of the workpiece does not move before the punch 34 comes into full contact with the workpiece. In particular, it should be pointed out that the flatness of the workpiece (riveted plate) is ensured by the blank holder 35 during the riveting process.

[0041] In addition, a vibration main shaft 46 is arranged in a side housing 41, and the side housing 41 is connected to the main housing 31; the vibration main shaft 46 is arranged in the side housing 41 and extends into the main housing 31. A sleeve 42 is rotatably arranged in the side housing 41, and a left end cover 44 and a right end cover 47 are respectively arranged at both ends of the sleeve 42; the vibration main shaft 46 is connected to the sleeve 42 through a spacer 45, and the driving end of the vibration main shaft 46 extends out of the right end cover 47. A cover 43 is arranged at one end of the side housing 41 away from the main housing 31, and the transmission shaft of the left end cover 44 passes through the cover 43; the transmission shaft of the left end cover 44 is in transmission connection with the output shaft of a driving device, and the driving device is fixedly arranged on the side housing 41. Through the above structure, the driving motor can be connected to the vibration main shaft 46 to achieve efficient transmission.

[0042] Finally, this low-frequency vibration self-piercing riveting device can be applied to a riveting system.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-frequency vibration self-piercing riveting device, characterized in that, Comprising: A bracket (2), the bracket (2) being provided with a first mounting area (21) and a second mounting area (22); An oil cylinder assembly (1) is arranged in the first mounting area (21). A push rod (13) in the oil cylinder assembly (1) is connected to a riveting assembly (3) through an oil cylinder lower end cover (14), and the riveting assembly (3) is connected to a vibration assembly (4) through a riveting main shaft (32); An eccentric friction wheel (48) in the vibration assembly (4) cooperates with a driven friction wheel (49). The eccentric friction wheel (48) is sleeved on a vibration main shaft (46), and the vibration main shaft (46) is in transmission connection with a driving device; The driven friction wheel (49) is sleeved on the riveting main shaft (32), and a punch (34) is arranged at the output end of the riveting main shaft (32); A female die (5) is arranged in the second mounting area (22).

2. The low-frequency vibration self-piercing riveting device according to claim 1, wherein The bracket (2) is a C-shaped frame.

3. The low-frequency vibration self-piercing riveting device according to claim 1, wherein, The push rod (13) is arranged in an oil cylinder housing (11) of the oil cylinder assembly (1). An oil inlet and an oil outlet are arranged on the oil cylinder housing (11), and an oil cylinder upper end cover (12) is arranged at the top of the oil cylinder housing (11); The push rod (13) is in transmission connection with the oil cylinder lower end cover (14), and the oil cylinder lower end cover (14) moves synchronously with the push rod (13).

4. The low-frequency vibration self-piercing riveting device according to claim 3, characterized in that, A main housing (31) of the riveting assembly (3) is fixedly connected to the oil cylinder lower end cover (14). A first spring (36) is arranged in the main housing (31), and the first spring (36) is sleeved on the riveting main shaft (32); One end of the first spring (36) is connected to the main housing (31), and the other end of the first spring (36) is connected to a flange of the riveting main shaft (32).

5. The low-frequency vibration self-piercing riveting device according to claim 4, characterized in that A main housing end cover (33) is arranged at the bottom of the main housing (31), and the punch (34) of the riveting main shaft (32) penetrates through the main housing end cover (33); A second spring (37) is further arranged inside the main housing (31), and the second spring (37) is sleeved on the riveting main shaft (32); One end of the second spring (37) is connected to the driven friction wheel (49), and the other end of the second spring (37) is connected to the inner surface of the main housing end cover (33).

6. The low-frequency vibration self-piercing riveting device according to claim 5, characterized in that One end of a third spring (38) is connected to the outer surface of the main housing end cover (33), and the other end of the third spring (38) is connected to a blank holder (35); The blank holder (35) is sleeved on the punch (34).

7. The low-frequency vibration self-piercing riveting device according to claim 6, wherein The vibration main shaft (46) is arranged in a side housing (41), and the side housing (41) is connected to the main housing (31); The vibration main shaft (46) is arranged in the side housing (41) and extends into the main housing (31).

8. The low-frequency vibration self-piercing riveting device according to claim 7, characterized in that, A sleeve (42) is rotatably arranged inside the side housing (41), and a left end cover (44) and a right end cover (47) are respectively arranged at both ends of the sleeve (42); The vibration main shaft (46) is connected within the sleeve (42) through a spacer block (45), and the transmission end of the vibration main shaft (46) extends out of the right end cover (47).

9. The low-frequency vibration self-piercing riveting device according to claim 7, characterized in that A cover (43) is provided at one end of the side housing (41) away from the main housing (31), and the transmission shaft of the left end cover (44) passes through the cover (43); The transmission shaft of the left end cover (44) is in transmission connection with the output shaft of the driving device, and the driving device is fixedly arranged on the side housing (41).

10. A riveting system, characterized in that, Comprising: Using the low-frequency vibration self-piercing riveting equipment according to any one of claims 1-9.

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