Riveting force and riveting speed monitoring device for electromagnetic drive type single-side riveting

Abstract

The utility model belongs to the technical field of single-side riveting, and particularly relates to an electromagnetic drive type single-side riveting riveting force and riveting speed monitoring device which comprises a magnetostriction displacement sensor, a guide rod and a force sensor, the magnetostriction displacement sensor is arranged above a coil, the guide rod penetrates through the coil to be connected with an amplifier, and the force sensor is connected with the magnetostriction displacement sensor. The axis of the guide rod and the axis of the magnetostriction displacement sensor are located on the same straight line, a position magnet of the magnetostriction displacement sensor is connected with the guide rod, and the force sensor is arranged between the amplifier and the punch. According to the utility model, reliable monitoring of riveting force and riveting speed in electromagnetic drive type single-sided riveting can be realized, and accurate and reliable data can be provided for optimization and quality control of a single-sided riveting process.

Description

Technical Field

[0001] This utility model belongs to the field of single-sided riveting technology, specifically relating to a riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting. Background Technology

[0002] Single-sided riveting is a process that allows for the joining of dissimilar materials from a single side, eliminating the need for pre-drilled holes or back supports. It is suitable for confined spaces where two-sided contact is impossible, highlighting its technological advantages. Currently, this type of riveting technology is widely used in joining dissimilar materials in automotive bodies. Furthermore, due to the advantages of electromagnetic drive, an increasing number of single-sided riveting applications are now using electromagnetic drive.

[0003] Riveting force and speed reflect the product's qualification level and provide a reference for riveting force and speed under different products. Therefore, riveting processes using electromagnetic drives require real-time monitoring and acquisition of riveting force and speed. Currently, the common practice for monitoring riveting force and speed is to place the force sensor under the mold, meaning the sensor is not located on the upper plate or at the riveting gun. This monitoring method is generally suitable for double-sided riveting, but the reliability of real-time monitoring data for single-sided riveting is relatively low. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting, which aims to realize reliable monitoring of riveting force and riveting speed in electromagnetically driven single-sided riveting, and provide accurate and reliable data for the optimization and quality control of single-sided riveting process.

[0005] The present invention includes a magnetostrictive displacement sensor, a guide rod, and a force sensor. The magnetostrictive displacement sensor is disposed above a coil. The guide rod passes through the coil and is connected to an amplifier. The axis of the guide rod and the axis of the magnetostrictive displacement sensor are on the same straight line. The position magnet of the magnetostrictive displacement sensor is connected to the guide rod. The force sensor is disposed between the amplifier and the punch.

[0006] Furthermore, the magnetostrictive displacement sensor is mounted on a support located above the coil. A through hole is provided on the support, through which the magnetostrictive displacement sensor passes. One end of the guide rod passes through the through hole, and the other end is connected to the amplifier. The position magnet is connected to the end of the guide rod that passes through the through hole.

[0007] Furthermore, one end of the guide rod that passes through the through hole has an axially formed mating hole, and the end of the magnetostrictive displacement sensor facing the guide rod passes through the mating hole.

[0008] Furthermore, one end of the guide rod that passes through the through hole slides axially with the through hole.

[0009] Furthermore, it also includes a guide sleeve and a guide cap. The guide sleeve is disposed on the inner wall of the through hole, the guide cap is slidably fitted with the inner wall of the guide sleeve, and the guide cap is disposed at one end of the guide rod that passes through the through hole. The magnetostrictive displacement sensor is disposed at one end of the guide rod that passes through the mating hole along the guide cap, and the position magnet is disposed on the guide cap.

[0010] Furthermore, the position magnet is mounted on the guide post cap by screws.

[0011] Furthermore, the force sensor is ring-shaped, and the amplifier and the punch are connected by a connecting shaft passing through the force sensor.

[0012] Furthermore, the distance between the punch and the amplifier is adjustable.

[0013] Furthermore, one end of the connecting shaft is fixed to the amplifier, and the other end is threadedly connected to the punch.

[0014] Furthermore, the force sensor is a piezoelectric force sensor.

[0015] The beneficial effects of this invention are that both the magnetostrictive displacement sensor and the force sensor are mounted on the riveting gun structure. When the amplifier moves downward, it drives the guide rod downward, thereby moving the position magnet downward. The magnetostrictive displacement sensor detects this displacement in real time, thus obtaining the riveting speed-time curve. Simultaneously, during the riveting process, the riveting force is transmitted to the force sensor, which acquires an electrical signal. Through corresponding data processing, the riveting force-time curve is finally obtained, enabling reliable monitoring of riveting force and speed in electromagnetically driven single-sided riveting. This provides accurate and reliable data for optimizing the single-sided riveting process and controlling quality. Furthermore, the use of a magnetostrictive displacement sensor offers high accuracy, fast response speed, and resistance to electromagnetic interference, ensuring the reliability and accuracy of its monitoring even under long-term operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the application of the electromagnetically driven single-sided riveting force and riveting speed monitoring device of this utility model.

[0017] Figure 2 This is a partial view of the riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting according to this utility model.

[0018] Figure 3 This is a second partial view of the riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting according to this utility model.

[0019] In the diagram: 1. Magnetostrictive displacement sensor; 101. Position magnet; 2. Guide rod; 201. Mating hole; 3. Force sensor; 4. Guide sleeve; 5. Guide cap; 6. Screw; 7. Support; 8. Coil; 9. Drive plate assembly; 10. Amplifier; 11. Punch; 12. Connecting shaft; 13. Nail; 14. Upper plate; 15. Lower plate. Detailed Implementation

[0020] like Figures 1-3 As shown, this utility model provides a riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting, including a magnetostrictive displacement sensor 1, a guide rod 2, and a force sensor 3. The magnetostrictive displacement sensor 1 is disposed above a coil 8. The guide rod 2 passes through the coil 8 and is connected to an amplifier 10, with the axis of the guide rod 2 and the axis of the magnetostrictive displacement sensor 1 on the same straight line. A position magnet 101 of the magnetostrictive displacement sensor 1 is connected to the guide rod 2. The force sensor 3 is disposed between the amplifier 10 and the punch 11. In the riveting gun structure applied in this utility model, the amplifier 10 is specifically disposed below the drive plate assembly 9, and the guide rod 2 passes through the drive plate assembly 9 and is connected to the amplifier 10. More specifically, the drive plate assembly 9 includes a frame and a drive plate disposed on the frame, with the drive plate facing the coil 8. The amplifier 10 is disposed at the bottom of the frame.

[0021] In the riveting gun structure, when the coil 8 is energized, it will generate an instantaneous strong magnetic field. The driving plate is subjected to the strong magnetic field and generates eddy currents, forming a magnetic field opposite to that of the coil 8. Since the two magnetic fields will generate a repulsive force, the force moves downward at high speed through the driving plate and amplifier 10. Through the action of the punch 11, the nail 13 is driven into the upper plate 14 and the lower plate 15 to complete the riveting.

[0022] When this electromagnetically driven single-sided riveting force and speed monitoring device is applied to a riveting structure, both the magnetostrictive displacement sensor 1 and the force sensor 3 are electrically connected to an external controller and are mounted on the riveting gun structure. When the amplifier 10 moves downwards, it drives the guide rod 2 downwards, thereby moving the position magnet 101 downwards. The magnetostrictive displacement sensor 1 detects this displacement in real time, thus obtaining the riveting speed-time curve. Simultaneously, during the riveting process, the riveting force is transmitted to the force sensor 3, acquiring an electrical signal. Through corresponding data processing, the riveting force-time curve is finally obtained, achieving reliable monitoring of riveting force and speed in electromagnetically driven single-sided riveting. This provides accurate and reliable data for optimizing the single-sided riveting process and controlling quality. The magnetostrictive displacement sensor 1, with its high accuracy, fast response speed, and resistance to electromagnetic interference, ensures the reliability and accuracy of its monitoring even under long-term operation.

[0023] The magnetostrictive displacement sensor 1 is mounted on a support 7, which is specifically part of the rivet gun structure. The support 7 is located above the coil 8, meaning the coil 8 is located below the support 7. A through hole is provided on the support 7, through which the magnetostrictive displacement sensor 1 passes. One end of the guide rod 2 passes through the through hole, and the other end is connected to the amplifier 10. The position magnet 101 is connected to the end of the guide rod 2 that passes through the through hole. Based on this configuration, the magnetostrictive displacement sensor 1 and other structures can be installed using existing components in the rivet gun structure without altering the compact internal structure of the original rivet gun or widening its interior. This allows for modification of existing rivet gun structures to apply the monitoring device of this invention.

[0024] The guide rod 2 has an axially formed mating hole 201 at one end, which passes through the through hole. The magnetostrictive displacement sensor 1 is inserted into the mating hole 201 at one end facing the guide rod 2, and the side of the magnetostrictive displacement sensor 1 at this end is clearance-fitted with the inner wall of the mating hole 201, meaning there is no contact and no interference with the movement of the guide rod 2. Based on this configuration, the distance between the end of the guide rod 2 passing through the mating hole 201 and the position magnet 101 is closer, making it easier to connect the position magnet 101 and the guide rod 2.

[0025] The guide rod 2, with one end passing through the through hole, slides axially with the through hole to ensure the stability of the axial movement of the guide rod 2 when the amplifier 10 moves downward. Specifically, this utility model also includes a guide sleeve 4 and a guide cap 5. The guide sleeve 4 is disposed on the inner wall of the through hole, and the guide cap 5 slides axially with the inner wall of the guide sleeve 4. The guide cap 5 is disposed at the end of the guide rod 2 passing through the through hole, that is, the guide and the through hole are axially slidably connected through the guide sleeve 4 and the guide cap 5. The magnetostrictive displacement sensor 1, with one end facing the guide rod 2, passes through the mating hole 201 along the guide cap 5, and the position magnet 101 is disposed on the guide cap 5. Since the guide cap 5 is a ring-like structure, it can achieve sliding engagement with the guide sleeve 4, allow the magnetostrictive displacement sensor 1 to pass normally through the end facing the guide rod 2, and also facilitate the fixation of the position magnet 101.

[0026] The position magnet 101 is mounted on the guide cap 5 by screws 6. Specifically, the guide cap 5 has a threaded hole, and the position magnet 101 has a through hole. The screw 6 passes through the through hole and connects with the threaded hole to fix the position magnet 101 on the guide cap 5. This mounting method is stable, reliable, and easy to install and remove.

[0027] In this invention, the force sensor 3 is annular, and the amplifier 10 and the punch 11 are connected by a connecting shaft 12 passing through the force sensor 3, with a clearance fit between the force sensor 3 and the connecting shaft 12. Preferably, the distance between the punch 11 and the amplifier 10 is adjustable, allowing for an increase in preload on the force sensor 3 by adjusting the distance between them. Specifically, one end of the connecting shaft 12 is fixed to the amplifier 10, and the other end is threaded. The punch 11 is threaded to the other end of the connecting shaft 12. This design not only facilitates the installation of the punch 11 and ensures its stability, but also allows for adjustment of the distance between the punch 11 and the amplifier 10 by rotating the punch 11, thus facilitating an increase in preload on the force sensor 3.

[0028] Preferably, the force sensor 3 is a piezoelectric force sensor, which can effectively measure dynamic or rapidly changing forces, and has high sensitivity, can detect minute force changes, and can measure dynamic forces with high frequencies.

[0029] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0030] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A device for monitoring riveting force and riveting speed in electromagnetically driven single-sided riveting, characterized in that, The device includes a magnetostrictive displacement sensor (1), a guide rod (2), and a force sensor (3). The magnetostrictive displacement sensor (1) is positioned above a coil (8). The guide rod (2) passes through the coil (8) and is connected to an amplifier (10). The axis of the guide rod (2) is on the same straight line as the axis of the magnetostrictive displacement sensor (1). The position magnet (101) of the magnetostrictive displacement sensor (1) is connected to the guide rod (2). The force sensor (3) is positioned between the amplifier (10) and the punch (11).

2. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 1, characterized in that, The magnetostrictive displacement sensor (1) is mounted on a support (7), which is located above the coil (8). A through hole is provided on the support (7), and the magnetostrictive displacement sensor (1) is inserted through the through hole. One end of the guide rod (2) is inserted through the through hole, and the other end is connected to the amplifier (10). The position magnet (101) is connected to the end of the guide rod (2) inserted through the through hole.

3. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 2, characterized in that, The guide rod (2) has a mating hole (201) axially opened at one end of the through hole, and the magnetostrictive displacement sensor (1) is inserted into the mating hole (201) at one end facing the guide rod (2).

4. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 3, characterized in that, The guide rod (2) has one end inserted into the through hole and slides axially with the through hole.

5. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 4, characterized in that, It also includes a guide sleeve (4) and a guide cap (5). The guide sleeve (4) is disposed on the inner wall of the through hole. The guide cap (5) is slidably fitted with the inner wall of the guide sleeve (4). The guide cap (5) is disposed at one end of the guide rod (2) that passes through the through hole. The magnetostrictive displacement sensor (1) is disposed at one end of the guide rod (2) that passes through the mating hole (201) along the guide cap (5). The position magnet (101) is disposed on the guide cap (5).

6. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 5, characterized in that, The position magnet (101) is mounted on the guide cap (5) by a screw (6).

7. The electromagnetically driven single-sided riveting force and riveting speed monitoring device as described in any one of claims 1-6, characterized in that, The force sensor (3) is ring-shaped, and the amplifier (10) and the punch (11) are connected by a connecting shaft (12) passing through the force sensor (3).

8. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 7, characterized in that, The distance between the punch (11) and the amplifier (10) is adjustable.

9. The riveting force and riveting speed monitoring device for electromagnetically driven single-sided riveting as described in claim 8, characterized in that, One end of the connecting shaft (12) is fixed to the amplifier (10), and the other end is threaded to the punch (11).

10. The electromagnetically driven single-sided riveting force and riveting speed monitoring device as described in any one of claims 1-6, 8, and 9, characterized in that, The force sensor (3) is a piezoelectric force sensor.

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