CN105903884B - A magnetic pulse riveting device with double-side loading for headless rivets - Google Patents

Abstract

The invention relates to a headless rivet double-side loaded magnetic pulse riveting device, which is characterized in that it includes a hand wheel (1), an adjusting stud (2), a frame beam (3), a frame longitudinal beam (4), and a vertical wedge (5), guide sleeve (6), transverse wedge (7), spring seat (8), bolt (9), spring (10), riveting die (11), transverse wedge support seat (12), base ( 13), coil seat guide rod (14), coil seat (15), coil (16), driver sheet (17), driver sheet seat (18), rectifier (19), resistor (20), switch (21), Transformer (22), capacitor (23), riveting die base (24), riveting die base bead (25), horizontal wedge block main body (26), the headless rivet electromagnetic riveting device of the present invention only utilizes a coil discharge, will pass through two The wedge mechanism converts the vertical movement of the driving plate into the horizontal movement of the riveting die, and a spring return mechanism is set on the horizontal wedge, and the distance between the two riveting dies can be adjusted by rotating the handwheel to adapt to rivets of different lengths , has the advantages of simple structure, low cost and convenient operation.

Description

A magnetic pulse riveting device with double-side loading for headless rivets

technical field

The invention relates to an electromagnetic riveting technology, in particular to a double-side loaded magnetic pulse riveting device for a headless rivet.

Background technique

The riveting process is one of the main connection methods of the current aircraft structure. It is easy to operate and the connection strength is stable and reliable. The impact force generated by the riveting gun in electromagnetic riveting has a very high loading rate on the rivet, which can form a uniform interference amount between the nail rod and the hole wall of the riveted interlayer, thereby prolonging the life of the joint; and its quality is stable and low in cost. It is used in Airbus A380 and other aircrafts. A headless rivet is a solid round bar interference rivet without a rivet head. The headless rivet is a riveting process that applies equal and opposite loads from both sides to form a heading on both sides of the connected piece. Compared with the traditional dome head rivet connection, the interference amount of the headless rivet connection is relatively uniform, which can achieve an ideal interference fit, so the fatigue life is longer, and because both sides of the headless rivet are upset, there is no dome head rivet in the shaft The shear failure of the nail head occurs under the load condition, so the pull-off strength is also higher than that of the round head rivet. Therefore, the riveting performance of headless rivets using electromagnetic riveting technology is very good.

Traditional headless rivet electromagnetic riveting equipment needs to install an electromagnetic riveting device on both sides of the riveted piece, which can be divided into two types: large-scale drilling riveting equipment and hand-held riveting gun headless rivet riveting device. Large-scale drilling and riveting devices are expensive and occupy a large area, which is not suitable for single-piece small-batch production; the typical structure of a hand-held headless riveting device, such as the headless rivet riveting device used in the application for invention CN102527905A, needs to be installed on both sides of the riveted piece. Use the same electromagnetic riveting gun, so the riveting process requires two people to cooperate. When applied to actual production, the equipment investment is large, the labor cost is high, and the operation is relatively complicated. Therefore, it is of great significance to invent a headless rivet electromagnetic riveting device with simple structure and low cost, which can be operated by a single person.

Contents of the invention

The object of the present invention is to provide a headless rivet riveting device based on electromagnetic riveting with high connection strength and uniform interference. In the headless rivet electromagnetic riveting device provided by the present invention, the vertical movement of the drive plate is converted into the horizontal movement of the riveting molds on both sides through two pairs of wedges, and the headless rivet is loaded from both sides to make the rivet top The rod has a relatively uniform amount of interference.

The technical solution adopted by the present invention provides a headless rivet double-side loading magnetic pulse riveting device, which is characterized in that: hand wheel, adjusting stud, frame beam, frame longitudinal beam, vertical wedge, guide sleeve, horizontal wedge Block, spring seat, bolt, spring, riveting die, transverse wedge support seat, base, coil seat guide rod, coil seat, coil, driver plate, drive plate seat, rectifier, resistor, switch, transformer, capacitor, riveting die seat , Riveting mold seat bead, horizontal wedge main body, of which:

There is a threaded hole with a size of M80 in the middle of the frame beam to accommodate the adjustment stud. There are coil seat guide holes on both sides of the threaded hole to accommodate the coil seat guide rod.

The frame longitudinal beam is connected with the frame cross beam by bolts, and has a rectangular guide groove on it, which is used to accommodate the guide blocks on the vertical wedges 5 .

A rectangular through hole is opened in the middle of the longitudinal beam of the frame, and the support seat of the transverse wedge is inserted into it and fastened by bolts. The lower part of the frame stringer is connected to the base by bolts.

The driving piece is connected with the driving piece seat by bolts, the two sides of the driving piece seat are connected with the vertical wedge by bolts, and the horizontal wedge 7 is in contact with the slope of the vertical wedge to transmit the magnetic pressure on the driving piece.

The guide sleeve is made up of three independent plates connected by bolts. Its internal width and height are the same as those of the horizontal wedge, and it is used to accommodate the horizontal wedge. The lower end of the guide sleeve is connected with the support seat of the horizontal wedge by bolts. When pushing the transverse wedge to force the transverse wedge to move horizontally, the guide sleeve is used to limit the freedom of movement of the transverse wedge, so that the transverse wedge on both sides can only move towards each other along the horizontal direction.

The transverse wedge is composed of the main body of the transverse wedge, the riveting die base, the riveting die, and the bead of the riveting die base. To be fixed, the riveting die and the riveting die base are connected by threads. One side of the main body of the horizontal wedge has threaded holes for connecting bolts. After the riveting is completed, the horizontal wedge 7 resets under spring tension, and the horizontal wedge pushes the vertical wedge and the driver seat back to the initial position.

The reset mechanism is composed of bolts, springs, and spring seats. One end of the bolts is connected to the threaded hole on the transverse wedge, and the bolt head is in contact with the spring seats. The spring is installed between the frame longitudinal beam and the spring seat to provide reset The tension of the spring, the position where the spring contacts the spring seat and the frame longitudinal beam are all processed with dimples to prevent the spring from moving radially.

The handwheel is connected with the adjustment stud through the flat key, and when the handwheel is turned clockwise, the adjustment stud moves downward, pushing the coil seat, the coil, the driving piece and the driving piece seat to move downward.

The discharge circuit is composed of a rectifier, a resistor, a switch, a transformer, a capacitor and a coil, the secondary coil of the transformer is connected in series with the rectifier, the resistor and the capacitor, the coil and the capacitor are connected in parallel, and a switch is connected in series in the parallel branch of the coil.

Further, one end of the coil seat guide rod is connected to the hole on the coil seat through interference fit, and the other end is inserted into the guide hole on the frame beam, so that the coil seat can only move up and down.

Further, the vertical wedge and the transverse wedge are in contact through an inclined surface, and the inclined surface converts the vertical movement of the vertical wedge into the horizontal movement of the transverse wedge.

Furthermore, the coil is wound by a copper strip with a cross-section of 2mm×10mm. The copper strips are insulated with insulating tape, and the outer side of the copper strip is coated with epoxy resin and coagulant. After solidification, it is cut into a rectangle, and on the upper surface Threaded blind holes for connecting the coil base are drilled and connected to the coil base by bolts.

Further, one side of the vertical wedge is provided with a protrusion, the width of which is the same as the guide groove on the frame longitudinal beam, which is used to limit the degree of freedom of the vertical wedge. When the mechanism is assembled, the two vertical wedges can only move along the guide groove. Move up and down.

The present invention also provides a bidirectional loading riveting method for headless rivets based on magnetic pulse riveting, which is characterized in that it includes the following steps:

Step 1, put the headless rivet into the prefabricated rivet hole on the sheet, adjust the position of the riveted part, make the two ends of the rivet align with the rivet pit, and clamp it with a clamp.

Step 2, turn the handwheel clockwise to move the adjustment stud downward, push the coil seat and the coil to move downward, and the coil pushes the drive plate, drive plate seat, and vertical wedge to move downward, and the contact with the vertical wedge through the inclined surface The transverse wedge overcomes the tension of the spring and moves horizontally, so that the riveting molds on both sides can tighten the rivets.

In step 3, the alternating voltage is boosted by the step-up transformer. According to the diameter, length and material of the riveted rivets, the voltage after boosting is also correspondingly different.

Step 4. Close the switch to discharge the capacitor. Due to the drastic change of the current in the coil, an induced magnetic field is generated, and the induced magnetic field excites a current in the driver piece and generates an induced magnetic field. The wedge transmits the force to the transverse wedge through the inclined plane, and the transverse wedge overcomes the spring tension and moves to the middle to complete the riveting of the headless rivet;

Step 5. After the discharge is completed, the riveting mechanism resets under the tension of the spring.

Step 6. Turn the handwheel counterclockwise to raise the adjusting stud, and the spring tension pushes the transverse wedge to move to both sides, loosen the clamp, and take out the riveted part.

The beneficial effects of the present invention are:

Compared with traditional headless rivet riveting equipment, the headless rivet electromagnetic riveting device of the present invention only uses one coil to discharge, and converts the vertical movement of the driving plate into the horizontal movement of the riveting die through two pairs of wedge mechanisms. A spring return mechanism is set on the wedge, and the distance between the two riveting dies can be adjusted by rotating the handwheel to suit rivets of different lengths. It has the advantages of simple structure, low cost and convenient operation.

Description of drawings

Fig. 1 is an orthographic view of a headless rivet riveting device;

Fig. 2 is a sectional view of a headless rivet riveting device;

Fig. 3 is a sectional view of the rivet tightening before the headless rivet riveting device is riveted;

Fig. 4 is a sectional view of the headless rivet riveting device at the moment of riveting completion;

Fig. 5 is the positive two measurement view of transverse wedge;

Fig. 6 is a cross-sectional view of the riveted part before riveting;

Fig. 7 is a cross-sectional view of the riveted part after riveting.

In the figure 1-handwheel, 2-adjusting stud, 3-frame beam, 4-frame longitudinal beam, 5-vertical wedge, 6-guide sleeve, 7-horizontal wedge, 8-spring seat, 9-bolt, 10-spring, 11-riveting mold, 12-horizontal wedge support seat, 13-base, 14-coil seat guide rod, 15-coil seat, 16-coil, 17-drive piece, 18-drive piece seat, 19- Rectifier, 20-resistor, 21-switch, 22-transformer, 23-capacitor, 24-riveting mold base, 25-riveting mold base bead,

detailed description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings 1-7.

As shown in Figure 1-2, this embodiment provides a headless rivet double-loaded magnetic pulse riveting device, including a hand wheel 1, an adjusting stud 2, a frame beam 3, a frame longitudinal beam 4, and a vertical wedge 5 , guide sleeve 6, transverse wedge 7, spring seat 8, bolt 9, spring 10, riveting mold 11, transverse wedge support seat 12, base 13, coil seat guide rod 14, coil seat 15, coil 16, drive plate 17 , drive sheet seat 18, rectifier 19, resistor 20, switch 21, transformer 22, capacitor 23, riveting mold base 24, riveting mold base bead 25.

Specifically, as shown in Figure 2, the transformer raises the industrial voltage 380v to above 1000v, the rectifier 19 rectifies the raised transformed voltage into a direct current, and the current in the charging circuit decreases through the action of the resistor 2, and the direct current voltage charges the capacitor, When the switch is closed instantly, the capacitor 23 discharges the coil 16 to complete the discharge part.

There is a threaded hole with a size of M80 in the middle of the frame beam 3 to accommodate the adjustment stud 2. There are coil seat guide holes on both sides of the threaded hole to accommodate the coil seat guide rod 14. The coil 16 is connected to the coil seat 15 through bolts. .

The frame longitudinal beam 4 is connected with the frame beam 3 by bolts, and has a rectangular guide groove thereon for accommodating the guide blocks of the vertical wedges.

There is a rectangular through hole in the middle of the frame longitudinal beam 4, and the transverse wedge support seat 12 is inserted therein and fastened by bolts. The lower part of the frame longitudinal beam 4 is connected with the base 13 by bolts.

The driving piece 17 is connected to the driving piece seat 18 through bolts, and the two sides of the driving piece seat 18 are connected to the vertical wedge 5 by bolts, and the horizontal wedge 7 is in contact with the slope of the vertical wedge 5 to transmit the magnetic pressure on the driving piece 17 .

The guide sleeve 6 is made up of three independent plates connected by bolts, and its internal width and height are the same as those of the transverse wedge, which is used to accommodate the transverse wedge. When the vertical wedge pushes the horizontal wedge to force the horizontal movement of the horizontal wedge, the guide sleeve is used to limit the freedom of movement of the horizontal wedge 7, so that the horizontal wedge 7 on both sides can only move relative to each other along the horizontal direction.

The lower end of the guide sleeve 6 is connected with the supporting seat of the transverse wedge 7 by bolts, so as to limit the degree of freedom of the transverse wedge 7 so that the transverse wedge 7 can only move along the horizontal direction.

Horizontal wedge 7 is made up of horizontal wedge main body 26, riveting mold base 24, riveting mold 11, riveting mold base bead 25, riveting mold base bead 25 is connected with transverse wedge main body 26 by bolt, riveting mold base 24 is compressed Between the two, so that the position is fixed, the riveting die 11 and the riveting die base 24 are connected by threads. When the position of the riveted sheet material is fixed and the height of the riveting mold 24 is not suitable, the height of the riveting mold base 24 can be adjusted by unscrewing the fastening bolt of the riveting mold base. There is a threaded hole on one side of the horizontal wedge 7 for connecting bolts. After the riveting is completed, the horizontal wedge 7 resets under spring tension, and at the same time, the horizontal wedge 7 pushes the vertical wedge 5 and the driving piece seat 18 back to the initial state. Location.

The reset mechanism consists of a bolt 9, a spring 10, and a spring seat 8. One end of the bolt 9 is connected to the threaded hole on the transverse wedge 7, and the head of the bolt is in contact with the spring seat 8. The spring 10 is installed between the frame longitudinal beam 4 and the spring seat 8. Between them, it is used to provide tension for resetting the riveting mechanism, and the positions where the spring 10 contacts with the spring seat 8 and the frame stringer 4 are all processed with pits to prevent the spring 10 from moving radially.

The hand wheel 1 is connected with the adjusting stud 2 through the flat key, and when the hand wheel 1 is turned clockwise, the adjusting stud 2 moves downward, pushing the coil holder 15, the coil 16, the driving piece 17 and the driving piece holder 18 to move downward. When riveting rivets of different lengths, the rivets 11 on both sides can be pressed against the rivets by rotating the hand wheel 1 .

The discharge circuit is composed of a rectifier 19, a resistor 20, a switch 21, a transformer 22, a capacitor 23, and a coil 16. The secondary coil of the transformer 22 is connected in series with the rectifier 19, resistor 20, and capacitor 23, and the coil 16 is connected in parallel with the capacitor 23. A switch 21 is connected in series.

Rivets of different diameters can be riveted by changing the riveting dies 11 of different sizes.

When the above-mentioned device is used to rivet the headless rivet, the process includes the following steps:

Step 1, put the headless rivet into the prefabricated rivet hole on the sheet, adjust the position of the riveted part, make the two ends of the rivet align with the rivet pit, and clamp it with a clamp.

Step 2, turn the hand wheel 1 clockwise to move the adjusting stud 2 downward, push the coil seat 15 and the coil 16 to move downward, and the coil 16 pushes the driving piece 17, the driving piece seat 18, and the vertical wedge 5 to move downward, The horizontal wedge 7 that contacts the vertical wedge 5 through an inclined plane overcomes the tension of the spring 10 and moves horizontally, so that the riveting dies 11 on both sides tighten the rivets.

In step 3, the alternating voltage is boosted by the step-up transformer 22 , and the boosted voltage is correspondingly different according to the diameter, length and material of the riveted rivet.

Step 4, close the switch 21 to discharge the capacitor 23 . Due to the drastic change of the current in the coil 16, an induced magnetic field is generated, and the induced magnetic field excites a current in the driving piece and generates an induced magnetic field, and the two magnetic fields generate a strong repulsive force and push the driving piece 17, the driving piece seat 18 and the vertical wedge in 5 directions. Moving downward, the vertical wedge 5 transmits force to the horizontal wedge 7 through the inclined plane, and the horizontal wedge 7 overcomes the tension of the spring 10 and moves toward the middle to complete the riveting of the headless rivet. Since the angle between the inclined plane and the horizontal plane is 45°, the vertical The displacement of the wedge is h, and according to the relationship of trigonometric functions, the horizontal displacement of the transverse wedge is h/tan45°, which is h.

Step 5. After the discharge is completed, the riveting mechanism resets under the tension of the spring 10 .

Step 6. Turn the handwheel counterclockwise to raise the adjusting stud, and the spring tension pushes the transverse wedge 7 to move to both sides, loosen the clamp, and take out the riveted part.

Claims (6)

1. A headless rivet bilaterally loaded magnetic pulse riveting device is characterized in that: it comprises a hand wheel (1), an adjustment stud (2), a frame beam (3), a frame longitudinal beam (4), a vertical wedge ( 5), guide sleeve (6), transverse wedge (7), spring seat (8), bolt (9), spring (10), riveting die (11), transverse wedge support seat (12), base (13 ), coil base guide rod (14), coil base (15), coil (16), driver piece (17), driver piece holder (18), rectifier (19), resistor (20), switch (21), transformer (22), capacitor (23), riveting die base (24), riveting die base bead (25), transverse wedge main body (26), wherein: A threaded hole is opened in the middle of the frame beam (3) to accommodate the adjusting stud (2), and coil seat guide holes are opened on both sides of the threaded hole to accommodate the coil seat guide rod (14); The frame longitudinal beam (4) is connected with the frame beam (3) by bolts, and a rectangular guide groove is opened on it to accommodate the guide block of the vertical wedge; There is a rectangular through hole in the middle of the frame longitudinal beam (4), and the horizontal wedge support seat (12) is inserted into it and fastened by bolts; the lower part of the frame longitudinal beam (4) is connected with the base (13) by bolts; The driving piece (17) is connected to the driving piece seat (18) by bolts, the two sides of the driving piece seat (18) are connected to the vertical wedge (5) by bolts, and the horizontal wedge (7) is connected to the slope of the vertical wedge (5). contact, in order to transmit the magnetic pressure on the driving piece (17); The guide sleeve (6) is composed of three independent plates connected by bolts, and its internal width and height are the same as the transverse wedge, used to accommodate the transverse wedge, and the lower end of the guide sleeve (6) is supported by the transverse wedge (7) The seat is connected by bolts. When the vertical wedge pushes the horizontal wedge to force the horizontal movement of the horizontal wedge, the guide sleeve is used to limit the freedom of movement of the horizontal wedge (7), so that the horizontal wedge (7) on both sides can only move along the Movement in the horizontal direction; The transverse wedge is made up of the transverse wedge main body (26), the riveting die base (24), the riveting die (11), the riveting die base bead (25), and the riveting die base bead (25) passes through the bolt and the transverse wedge main body (26 ), the riveting mold base (24) is pressed between the two, thereby the position is fixed, and the riveting mold (11) and the riveting mold base (24) are connected by threads; one side of the transverse wedge (7) is opened There are threaded holes for connecting bolts. After the riveting is completed, the horizontal wedge (7) resets under spring tension, and at the same time, the horizontal wedge (7) pushes the vertical wedge (5) and the driver seat (18) back to the initial state Location; The reset mechanism is composed of a bolt (9), a spring (10), and a spring seat (8). One end of the bolt (9) is connected to the threaded hole on the transverse wedge (7), the bolt head is in contact with the spring seat (8), and the spring (10) Installed between the frame longitudinal beam (4) and the spring seat (8), used to provide the tension to reset the riveting mechanism, the position where the spring (10) contacts the spring seat (8) and the frame longitudinal beam (4) All are processed with pits to prevent the spring (10) from moving radially; The hand wheel (1) is connected with the adjustment stud (2) through the flat key, when the hand wheel (1) is turned clockwise, the adjustment stud (2) moves downward, pushing the coil seat (15), the coil (16) , the driving piece (17) and the driving piece seat (18) move downward; Discharge circuit is made up of rectifier (19), resistance (20), switch (21), transformer (22), capacitor (23), coil (16), transformer (22) secondary coil and rectifier (19), resistance (20 ), the capacitor (23) is connected in series, the coil (16) is connected in parallel with the capacitor (23), and a switch (21) is connected in series in the coil parallel branch. 2. The headless rivet double-side loading magnetic pulse riveting device according to claim 1, characterized in that: one end of the coil base guide rod (14) is connected to the hole on the coil base (15) through interference fit, and the other end is inserted into The guide hole on the frame cross beam makes the coil seat (15) only move up and down. 3. The double-side loading magnetic pulse riveting device for headless rivets according to claim 1, characterized in that: the vertical wedge (5) and the horizontal wedge (7) are in contact with each other through an inclined surface, and the inclined surface pushes the vertical wedge (5) The vertical motion of the horizontal wedge (7) is converted into the horizontal motion of the transverse wedge (7). 4. The double-side loaded magnetic pulse riveting device for headless rivets according to claim 1, characterized in that: the coil is made of copper strips with a cross-section of 2mm×10mm, and the copper strips are insulated with insulating tape, and the copper strips The outer side is coated with epoxy resin and coagulant, and after solidification, it is cut into a rectangle, and a threaded blind hole for connecting the coil seat is drilled on the upper surface, and is connected with the coil seat (15) by bolts. 5. The headless rivet double-side loading magnetic pulse riveting device according to claim 1, characterized in that: one side of the vertical wedge (5) is provided with a protrusion, the width of which is the same as the guide groove on the frame longitudinal beam, for The degree of freedom of the vertical wedges (5) is limited, and when the mechanism is assembled, the two vertical wedges (5) can only move up and down along the guide groove. 6. A headless rivet bidirectionally loaded riveting method based on magnetic pulse riveting, characterized in that it comprises the following steps: Step 1, put the headless rivet into the prefabricated rivet hole on the sheet, adjust the position of the riveted part, make the two ends of the rivet align with the rivet pit, and clamp it with a clamp; Step 2, turn the handwheel (1) clockwise to move the adjustment stud (2) downward, push the coil seat (15) and the coil (16) to move downward, and the coil (16) pushes the drive plate (17), drive The sheet seat (18) and the vertical wedge (5) move downward, and the horizontal wedge (7), which contacts the vertical wedge (5) through an inclined surface, overcomes the tension of the spring (10) and moves horizontally, so that the riveting molds ( 11) Tighten the rivets; Step 3, the alternating voltage is boosted through the step-up transformer (22), and the voltage after boosting is also correspondingly different according to the diameter, length and material of the riveted rivet; Step 4, closing the switch (21) to discharge the capacitor (23); due to the drastic change in the current in the coil (16), an induced magnetic field is generated, and the induced magnetic field excites a current in the drive plate (17) and generates an induced magnetic field, the two The magnetic field generates a strong repulsive force and pushes the driving piece (17), the driving piece seat (18) and the vertical wedge (5) to move downward, and the vertical wedge (5) transmits the force to the horizontal wedge (7) through the inclined plane, and the horizontal wedge (7) The wedge (7) overcomes the tension of the spring (10) and moves toward the middle to complete the riveting of the headless rivet; Step 5. After the discharge is completed, the riveting mechanism resets under the tension of the spring (10); Step 6. Turn the hand wheel (1) counterclockwise to raise the adjusting stud (2), and the spring tension pushes the transverse wedge (7) to move to both sides, loosen the clamp, and take out the riveted part.