CN106734568A - Method and device for connecting plates and pipes based on magnetic pulse forming - Google Patents

Abstract

A method and a device for connecting a plate and a pipe based on magnetic pulse forming belong to the field of metal material processing and forming. The problems of low die change efficiency and high manufacturing cost of large coils in a multi-process machining process of a magnetic pulse forming technology are solved. The invention firstly punches the blank, then carries out magnetic pulse flanging forming, finally utilizes the magnetic pulse forming technology to install the connecting pipe fitting, utilizes the coil to complete multi-process machining forming, has quick and efficient forming process, high machining precision of the formed workpiece, no burr, small resilience and no crack, does not need subsequent cleaning process and post-welding heat treatment, and obviously improves the forming limit of the material and the machining flexibility of the electromagnetic pulse connection of the plate and the pipe. The connecting device is suitable for connecting plates and pipe fittings.

Description

Method and device for connecting plates and pipes based on magnetic pulse forming

technical field

The invention belongs to the field of metal material processing and forming.

Background technique

The connection between the metal plate and the pipe structure has a wide range of applications in real life, such as the connection between the tank and the water pipe of the water supply pipe in daily life, the connection between the fuel tank and the oil pipeline in the automobile and aerospace vehicle, the connection of the aircraft operating rod, The connection between metal and non-metallic materials. Therefore, it is of great practical value to study the connection between plates and tubes. The connection between magnetic pulse forming technology and traditional plates and tubes provides a new forming method.

With the advancement of science and technology, the development of lightweight engineering for automobiles and aerospace vehicles, the traditional punching, flanging, and connection technologies cannot meet the forming process of complex parts, and it is difficult to improve the forming limit of metal materials, and the traditional forming process is still There are many forming defects, such as fractures, burrs, and cracks generated during punching of the edge of the flanging hole, resulting in unstable quality of the formed part, resulting in defects such as low forming limit of the metal material. The magnetic pulse forming technology has solved the problems existing in the traditional processing technology very well.

Use magnetic pulse forming technology to punch, flang, and connect metal materials. The formed workpiece has the characteristics of high precision, no burrs, small residual stress, and small springback, and can process complex parts with high precision, which greatly improves the forming limit of materials. Magnetic pulse forming technology conforms to the trend of lightweight engineering of automobiles and aerospace vehicles, improves the precise forming of light alloy materials, makes the production process fast and efficient, shortens the processing cycle, and realizes production automation and mechanization. It saves fuel for automobiles and aerospace vehicles, improves the environment, and the production process is green and pollution-free. Therefore, magnetic pulse shaping technology has important research value and huge economic benefits.

Although the magnetic pulse forming technology has great advantages and development prospects compared with the traditional processing technology, due to the practical problems of low mold change efficiency and high manufacturing cost of large coils in the multi-process processing process, this technology still exists in practical applications. Many deficiencies remain to be further developed, researched and perfected.

Contents of the invention

The invention aims to solve the problems of low mold change efficiency and high manufacturing cost of large coils in the multi-process processing of magnetic pulse forming technology, and proposes a method and device for connecting plates and pipes based on magnetic pulse forming.

According to the method for connecting plates and pipes based on magnetic pulse forming in the present invention, the specific steps of the method are:

Step 1: Open a circular through hole in the center of the No. 2 base 12, and set up a positioning groove on the upper surface of the No. 2 base 12, install the lower molding plate 14 in the groove, and install the lower molding plate 14 in the cylindrical shape. A No. 1 insulating block 15 is installed in the structure to buffer the electromagnetic repulsion generated by the circular flat coil 16, and the circular flat coil 16 is arranged in the cylindrical structure of the No. 1 insulating block 15;

Step 2: Connect the positive and negative poles of the circular flat coil 16 to the positive and negative signal output terminals of the electromagnetic forming discharge system, and place the base plate material 17 on the lower mold pressing plate 14, the No. 1 insulating block 15 and the circular flat coil 16 The upper side, and place the flanging mold 18 on the upper side of the base plate material 17, and install the punching die core 19 in the center hole of the flanging mold 18;

Step 3. When the switch 1 of the electromagnetic forming discharge system is closed, the electromagnetic forming discharge system discharges the circular flat coil 16. After the pulse current passes through the circular flat coil 16, a pulsed magnetic field is generated in the circular flat coil 16, and the blank material 17 is in the pulsed magnetic field, and an induced eddy current is generated on the surface of the blank material 17. The pulsed magnetic field generated by the induced eddy current is opposite to the rotation direction of the strong magnetic field of the circular plate coil 16, and the two magnetic fields generate mutually repulsive magnetic force to push the blank material 17 The upward movement interacts with the right-angled edge of the punching die core 19 to complete the punching of the blank and disconnect the switch 1;

Step 4. Disassemble the punching die core 19 in step 3 from the flanging die 18, close the switch 1 again, and the electromagnetic forming discharge system discharges the circular flat coil 16. After the pulse current passes through the circular flat coil 16, A pulsed magnetic field is generated in the flat plate coil 16, and the blank plate material 17 is in the pulsed magnetic field, and an induced eddy current is generated on the surface of the blank plate material 17. The pulsed magnetic field generated by the induced eddy current is opposite to the strong magnetic field rotation direction of the circular flat plate coil 16, and the two magnetic fields generate The mutually repulsive magnetic force pushes the blank material 17 to move upwards to fit the flanging mold 18, completes the flanging of the blank material 17, and turns off the switch 1;

Step 5. Disassemble the flanging mold 18 in step 5 from the base plate material 17, disassemble the circular flat coil 16 from the groove of the No. 1 insulating block 15, and set the bulging mold 25 on the flanging The outer side of the blank plate material 17, and utilize the No. 1 upper cover plate 20 to fix the bulging mold 25 by screws;

Step 6: Install one end of the telescopic rod 8 on the No. 1 base 6 through bolts, the steel core bushing 7 and the bulging coil 9 are set on the rod body of the telescopic rod 8, and the bulging coil 9 is close to the end of the telescopic rod 8 top setting;

Step 7. Extend the telescopic rod 8, and send the bulging coil 9 on the top of the telescopic rod 8 into the hole after the flanging of the blank material 17. The electromagnetic forming discharge system discharges the bulging coil 9, and after flanging The hole portion is subjected to the effect of electromagnetic force and fits with the bulging mold 25, so that small corrugated protrusions are produced around the flanging hole, so as to realize the corrugated bulging of the hole wall after flanging the blank material 17;

Step 8: Carry out heat treatment to the flanging hole of the base plate material 17 after step 7 corrugated bulging, and carry out surface derusting to the overlapping area of the flanging hole, and remove the bulging mold 25 and the No. 1 upper cover plate 20 from Remove the blank plate material 17, fix the connecting pipe fitting in the through hole of the upper mold pressing plate 23, and set the No. 2 insulating block 21 outside the connecting pipe fitting, and set the No. 2 insulating block 21 and the connecting pipe fitting Connecting the coil 22, the No. 2 insulating block 21 is arranged on the lower side of the upper molding plate 23;

Step 9: Set the upper mold pressing plate 23 and the flanging hole of the blank material 17 coaxially, press the upper mold pressing plate 23 and the lower mold pressing plate 14, so that the flanging hole of the blank material 17 is plugged into the connecting pipe;

Step 10. Extend the telescopic rod 8, remove the bulging coil 9, and send the steel core bushing 7 at the bottom of the telescopic rod 8 into the flanging hole after the corrugated bulging of the slab material 17, so that the steel mandrel The height of the top of the sleeve 7 is placed flush with the height of the top of the flanging hole, and placed coaxially with the flanging hole and the connecting pipe; the positive and negative signal output terminals of the electromagnetic forming discharge system are connected to the positive and negative signal input terminals of the connection coil 22, and the electromagnetic The forming discharge system discharges the connecting coil 22, and the electromagnetic forming discharge system discharges the connecting coil instantaneously. When the generated pulse magnetic field force is greater than the yield limit of the connecting pipe fitting, the pipe fitting and the flanging plate will generate a magnetic pulse in the overlapping area to connect the joint. The connection between the connecting pipe fitting and the blank material 17 is completed.

Plate and pipe connecting device based on magnetic pulse forming, the device includes electromagnetic forming discharge system, No. No. 1 insulation block 15, circular flat coil 16, blank plate material 17, flanging die 18, punching die core 19, No. 1 upper cover plate 20, No. 2 insulating block 21, connecting coil 22, upper die pressing plate 23 and bulging die 25;

The center of the No. 2 base 12 is provided with a circular through hole, and a positioning groove is provided on the upper surface of the No. 2 base 12. The lower mold pressing plate 14 and the No. 1 insulating block 15 are both cylindrical structures with upper openings. The bottoms of the plate 14 and the No. 1 insulating block 15 are all provided with circular through holes. The No. 1 insulating block 15 is installed in the cylindrical structure of the lower mold pressing plate 14. The circular through hole of the No. 1 insulating block 15 is connected to the bottom of the lower mold pressing plate 14. The diameters of the circular through holes are the same, and the circular plate coil 16 is installed in the cylindrical structure of the No. 1 insulating block 15; Set coaxially with the circular through hole on the bottom surface of No. 1 insulating block 15;

The top surface of the No. 1 insulating block 15 is located on the same level as the top surface of the lower molding plate 14; the blank material 17 is installed on the horizontal plane where the top surface of the No. 1 insulating block 15 is located;

The flanging mold 18 is a cylindrical structure with upper and lower openings, and the flanging mold 18 is used for flanging the blank material 17 after punching; when flanging the blank material 17, the flanging mold 18 is fixed On the upper side of the blank material 17, and coaxial with the No. 1 insulating block 15;

The punching die core 19 is a cylindrical structure with an valgus edge at the upper port; the punching die core 19 is used to punch the blank material 17, and when the blank material 17 is punched, the cylindrical structure of the punching die core 19 is inserted Connected in the cylindrical structure of the flanging mold 18, the eversion edge of the punching die core 19 is fixed on the upper surface of the flanging mold 18;

The electromagnetic forming discharge system is used to supply power to the circular flat coil 16 when flanging and punching the blank material 17; to supply power to the bulging coil 9 when corrugating the blank material 17; Connect the coil 22 to supply power;

The bulging coil 9 is used to be inserted into the hole after the flanging of the blank material 17, and the electromagnetic forming discharge system performs corrugated bulging on the wall of the hole after the flanging of the blank material 17; the bulging coil 9 is sleeved on the telescopic rod 8 On the body of the rod, the telescopic rod 8 is fixedly installed at the center of the No. 1 base 6;

The steel core shaft sleeve 7 is used to be sleeved on the rod body of the telescopic rod 8 when the pipe fitting is connected with the blank material 17 and plugged into the flanging hole after the blank material 17 is corrugated and bulging. The top of the steel core shaft sleeve 7 The height is placed flush with the height of the top of the flanged hole, and placed coaxially with the flanged hole and the connecting pipe;

The No. 2 insulating block 21, the connecting coil 22 and the upper mold pressing plate 23 form a crimping structure; the crimping structure is used to be sleeved on the outside of the connecting pipe when the connecting pipe is connected to the blank material 17;

Both the No. 2 insulating block 21 and the upper mold pressing plate 23 have a cylindrical structure with upper and lower openings. A connecting coil 22 is snapped into the cylindrical structure of the No. 2 insulating block 21, and the connecting coil 22 is a disc-shaped structure. The upper surface of the No. 1 insulating block 21 is bonded to the surface of the upper mold pressing plate 23; the No. 2 insulating block 21, the connecting coil 22 and the upper molding pressing plate 23 are all arranged coaxially.

Compared with the prior art, the present invention has the following main advantages:

1. The present invention uses coils to complete multi-process processing and forming. The forming process is fast and efficient, and the forming workpiece has high processing precision, no burrs, small springback, no cracks, no subsequent cleaning process and post-weld heat treatment, which significantly improves the forming limit and Process flexibility for EMP joining of sheets and tubes.

2. The mold of the present invention has a simple design and structure, can complete multi-process forming, and reduces production costs.

3. Compared with the traditional forming process, the magnetic pulse forming device of the present invention has simple mold design and long service life, can realize high-speed and high-precision processing and forming of plates, shorten the processing cycle, greatly improve production efficiency, and is more suitable for Mass production is conducive to the realization of automation, mechanization and other advantages.

4. The processing process of the present invention has no noise, no pollution, and is environmentally friendly, and is a practical technology that can be extended and applied.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the plate and pipe connecting device based on magnetic pulse forming when punching the slab material;

Fig. 2 is a structural schematic diagram of corrugated bulging of the hole wall after the flanging of the slab material by the plate and pipe connecting device based on magnetic pulse forming;

Fig. 3 is a sectional view of No. 1 insulating block;

Fig. 4 is the top view of No. 1 insulating block;

Fig. 5 is the sectional view of flanging mold;

Fig. 6 is the top view of flanging mold;

Fig. 7 is the sectional view of bulging mould;

Fig. 8 is the top view of bulging mould;

Fig. 9 is a cross-sectional view of a punching die core;

Figure 10 is a top view of the punching die core.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Specific embodiments 1. This embodiment is described in conjunction with FIGS. 1 to 10 . The method for connecting plates and pipes based on magnetic pulse forming described in this embodiment, the specific steps of the method are:

The step of punching the blank;

Step 1: Open a circular through hole in the center of the No. 2 base 12, and set up a positioning groove on the upper surface of the No. 2 base 12, install the lower molding plate 14 in the groove, and install the lower molding plate 14 in the cylindrical shape. A No. 1 insulating block 15 is installed in the structure to buffer the electromagnetic repulsion generated by the circular flat coil 16, and the circular flat coil 16 is arranged in the cylindrical structure of the No. 1 insulating block 15;

Step 2: Connect the positive and negative poles of the circular flat coil 16 to the positive and negative signal output terminals of the electromagnetic forming discharge system, and place the base plate material 17 on the lower mold pressing plate 14, the No. 1 insulating block 15 and the circular flat coil 16 The upper side, and place the flanging mold 18 on the upper side of the base plate material 17, and install the punching die core 19 in the center hole of the flanging mold 18;

Step 3. When the switch 1 of the electromagnetic forming discharge system is closed, the electromagnetic forming discharge system discharges the circular flat coil 16. After the pulse current passes through the circular flat coil 16, a pulsed magnetic field is generated in the circular flat coil 16, and the blank material 17 is in the pulsed magnetic field, and an induced eddy current is generated on the surface of the blank material 17. The pulsed magnetic field generated by the induced eddy current is opposite to the rotation direction of the strong magnetic field of the circular plate coil 16, and the two magnetic fields generate mutually repulsive magnetic force to push the blank material 17 The upward movement interacts with the right-angled edge of the punching die core 19 to complete the punching of the blank and disconnect the switch 1;

Steps of magnetic pulse flanging forming;

Step 4. Disassemble the punching die core 19 in step 4 from the flanging die 18, close the switch 1 again, and the electromagnetic forming discharge system discharges the circular flat coil 16. After the pulse current passes through the circular flat coil 16, A pulsed magnetic field is generated in the flat plate coil 16, and the blank plate material 17 is in the pulsed magnetic field, and an induced eddy current is generated on the surface of the blank plate material 17. The pulsed magnetic field generated by the induced eddy current is opposite to the strong magnetic field rotation direction of the circular flat plate coil 16, and the two magnetic fields generate The mutually repulsive magnetic force pushes the blank material 17 to move upwards to fit the flanging mold 18, completes the flanging of the blank material 17, and turns off the switch 1;

Step 5. Disassemble the flanging mold 18 in step 5 from the base plate material 17, disassemble the circular flat coil 16 from the groove of the No. 1 insulating block 15, and set the bulging mold 25 on the flanging The outer side of the blank plate material 17, and utilize the No. 1 upper cover plate 20 to fix the bulging mold 25 by screws;

Step 6: Install one end of the telescopic rod 8 on the No. 1 base 6 through bolts, the steel core bushing 7 and the bulging coil 9 are set on the rod body of the telescopic rod 8, and the bulging coil 9 is close to the end of the telescopic rod 8 top setting;

Step 7. Extend the telescopic rod 8, and send the bulging coil 9 on the top of the telescopic rod 8 into the hole after the flanging of the blank material 17. The electromagnetic forming discharge system discharges the bulging coil 9, and after flanging The hole portion is subjected to the effect of electromagnetic force and fits with the bulging mold 25, so that small corrugated protrusions are produced around the flanging hole, so as to realize the corrugated bulging of the hole wall after flanging the blank material 17;

Use magnetic pulse forming technology to install connecting pipe fittings;

Step 8: Carry out heat treatment to the flanging hole of the base plate material 17 after step 7 corrugated bulging, and carry out surface derusting to the overlapping area of the flanging hole, and remove the bulging mold 25 and the No. 1 upper cover plate 20 from Remove the blank plate material 17, fix the connecting pipe fitting in the through hole of the upper mold pressing plate 23, and set the No. 2 insulating block 21 outside the connecting pipe fitting, and set the No. 2 insulating block 21 and the connecting pipe fitting Connecting the coil 22, the No. 2 insulating block 21 is arranged on the lower side of the upper molding plate 23;

Step 9: Set the upper mold pressing plate 23 and the flanging hole of the blank material 17 coaxially, press the upper mold pressing plate 23 and the lower mold pressing plate 14, so that the flanging hole of the blank material 17 is plugged into the connecting pipe;

Step 10. Extend the telescopic rod 8, remove the bulging coil 9, and send the steel core bushing 7 at the bottom of the telescopic rod 8 into the flanging hole after the corrugated bulging of the slab material 17, so that the steel mandrel The height of the top of the sleeve 7 is placed flush with the height of the top of the flanging hole, and placed coaxially with the flanging hole and the connecting pipe; the positive and negative signal output terminals of the electromagnetic forming discharge system are connected to the positive and negative signal input terminals of the connection coil 22, and the electromagnetic The forming discharge system discharges the connecting coil 22, and the electromagnetic forming discharge system discharges the connecting coil instantaneously. When the generated pulse magnetic field force is greater than the yield limit of the connecting pipe fitting, the pipe fitting and the flanging plate will generate a magnetic pulse in the overlapping area to connect the joint. The connection between the connecting pipe fitting and the blank material 17 is completed.

Embodiment 2. This embodiment is a further description of the method for connecting plates and pipes based on magnetic pulse forming described in Embodiment 1. Step 7 also includes installing one end of the telescopic rod 8 to the No. 1 base 6 through bolts. A step of.

The telescopic rod described in this embodiment realizes the transmission of the bulging coil and the transmission of the steel core bushing. The bolt cover surrounds the card slot to realize the fixation of the bulging coil and the steel core bushing at the designated position of the telescopic rod, and complete the transmission of the bulging coil during electromagnetic bulging and the transmission of the steel core bushing during electromagnetic connection.

Specific Embodiment 3. This embodiment is a further description of the method for connecting plates and pipes based on magnetic pulse forming described in Embodiment 1. Step 8 also includes turning over the slab material 17 after corrugated bulging in Step 7. The side hole is heat treated, and the sub-step of surface derusting is carried out on the overlapping area of the flange hole.

The flanged hole after electromagnetic bulging described in this embodiment needs to meet a certain rigidity, so heat treatment is required to improve the strength and mechanical properties of the flanged hole. In addition, a steel mandrel is provided in the middle of the connection between the pipe fitting and the flanged hole cover to ensure that no structural instability occurs during the magnetic pulse connection.

Specific Embodiment Four. The magnetic pulse forming-based plate and pipe connecting device described in this embodiment includes an electromagnetic forming discharge system, a No. 1 base 6, a steel core sleeve 7, a telescopic rod 8, a bulging coil 9, two No. base 12, lower mold pressing plate 14, No. 1 insulating block 15, circular flat coil 16, blank plate material 17, flanging die 18, punching die core 19, No. 1 upper cover plate 20, No. 2 insulating block 21, connecting coil 22. Upper mold pressing plate 23 and bulging mold 25;

The center of the No. 2 base 12 is provided with a circular through hole, and a positioning groove is provided on the upper surface of the No. 2 base 12. The lower mold pressing plate 14 and the No. 1 insulating block 15 are both cylindrical structures with upper openings. The bottoms of the plate 14 and the No. 1 insulating block 15 are all provided with circular through holes. The No. 1 insulating block 15 is installed in the cylindrical structure of the lower mold pressing plate 14. The circular through hole of the No. 1 insulating block 15 is connected to the bottom of the lower mold pressing plate 14. The diameters of the circular through holes are the same, and the circular plate coil 16 is installed in the cylindrical structure of the No. 1 insulating block 15; Set coaxially with the circular through hole on the bottom surface of No. 1 insulating block 15;

The top end surface of No. 1 insulating block 15 and the top end surface of the lower molding plate 14 are located on the same horizontal plane; the blank material 17 is installed on the horizontal plane;

The flanging mold 18 is a cylindrical structure with upper and lower openings, and the flanging mold 18 is used for flanging the blank material 17 after punching; when flanging the blank material 17, the flanging mold 18 is fixed On the upper side of the blank material 17, and coaxial with the No. 1 insulating block 15;

The punching die core 19 is a cylindrical structure with an valgus edge at the upper port; the punching die core 19 is used to punch the blank material 17, and when the blank material 17 is punched, the cylindrical structure of the punching die core 19 is inserted Connected in the cylindrical structure of the flanging mold 18, the eversion edge of the punching die core 19 is fixed on the upper surface of the flanging mold 18;

The electromagnetic forming discharge system is used to supply power to the circular flat coil 16 when flanging and punching the blank material 17; to supply power to the bulging coil 9 when corrugating the blank material 17; Connect the coil 22 to supply power;

The bulging coil 9 is used to be plugged into the hole after the flanging of the blank material 17, and the hole wall after the flanging of the blank material 17 is corrugated and bulging after the electromagnetic forming discharge system; the bulging coil 9 is sleeved on the telescopic rod On the rod body of 8, telescopic rod 8 is fixedly installed in the center of No. 1 base 6;

The steel core shaft sleeve 7 is used to be sleeved on the rod body of the telescopic rod 8 when the pipe fitting is connected with the blank material 17 and plugged into the flanging hole after the blank material 17 is corrugated and bulging. The top of the steel core shaft sleeve 7 The height is placed flush with the height of the top of the flanged hole, and placed coaxially with the flanged hole and the connecting pipe;

The No. 2 insulating block 21, the connecting coil 22 and the upper mold pressing plate 23 form a crimping structure; the crimping structure is used to be sleeved on the outside of the connecting pipe when the connecting pipe is connected to the blank material 17;

Both the No. 2 insulating block 21 and the upper mold pressing plate 23 have a cylindrical structure with upper and lower openings. A connecting coil 22 is snapped into the cylindrical structure of the No. 2 insulating block 21, and the connecting coil 22 is a disc-shaped structure. The upper surface of the No. 1 insulating block 21 is bonded to the surface of the upper mold pressing plate 23; the No. 2 insulating block 21, the connecting coil 22 and the upper molding pressing plate 23 are all arranged coaxially.

Embodiment 5. This embodiment is a further description of the device for connecting plates and pipes based on magnetic pulse forming described in Embodiment 4. It also includes two No. 1 columns 11 and a No. 1 cover plate 20;

The two No. 1 columns 11 are fixed on the No. 2 base 12, and the two No. 1 columns 11 are respectively located on both sides of the lower mold pressing plate 14, and are arranged axisymmetrically with the central axis of the No. 2 base 12; The two ends of the cover plate 20 are provided with two sockets, and the two No. 1 columns 11 are plugged into the two sockets respectively. The No. 1 cover plate 20 is fixed on the two No. 1 columns 11 by fastening bolts. The No. 1 cover plate 20 is used for inserting bolts, and the bolts are used for fixing the flanging mold 18 or the bulging mold 25 .

Specific Embodiment 6. This embodiment is a further description of the magnetic pulse forming-based plate-to-pipe connection device described in Embodiment 5, which also includes two No. 2 columns 13 and No. 2 cover plates 24;

The two No. 2 columns 13 are all fixed on the No. 2 base 12, and the two No. 1 columns 11 are respectively located on both sides of the lower mold pressing plate 14, and are arranged axisymmetrically with the central axis of the No. 2 base 12; The two ends of the cover plate 24 are provided with two sockets, and the two No. 2 columns 13 are plugged into the two sockets respectively. The No. 2 cover plate 24 is fixed on the two No. 2 columns 13 by fastening bolts. The No. 2 cover plate 24 is used for inserting bolts, and the bolts are used for fixing the No. 2 insulating block 21 and the upper mold pressing plate 23 .

Embodiment 7. This embodiment is a further description of the magnetic pulse forming-based plate-to-pipe connection device described in Embodiment 4. The inner cross-section of the bottom end of the punching die core 19 is a 90° right-angle cutting edge.

Embodiment 8. This embodiment is a further description of the connection device for plates and pipes based on magnetic pulse forming described in Embodiment 4. The electromagnetic forming discharge system includes a switch 1, an energy storage capacitor 2, a current limiting resistor 3, and a rectifier. 4 and step-up transformer 5;

One end of the switch 1 is connected to one end of the energy storage capacitor 2 and one end of the secondary coil of the step-up transformer 5 at the same time, the other end of the secondary coil of the step-up transformer 5 is connected to the power signal input terminal of the rectifier 4, and the other end of the rectifier 4 is connected to the current limiting One end of the resistor 3, the other end of the current limiting resistor 3 is connected to the other end of the energy storage capacitor 2, the other end of the current limiting resistor 3 is the positive power signal output end of the electromagnetic forming discharge system, and the other end of the switch 1 is the electromagnetic Negative power supply signal output terminal of the shaping discharge system.

In the present invention, the upper mold pressing plate is fixed in the upper cover plate by bolts, at a predetermined center position, and interacts with the lower mold pressing plate to fix the flanging hole during electromagnetic connection. The lower mold pressing plate acts on the flanging mold, the bulging mold and the upper mold pressing plate respectively, and the fixed plate blank completes electromagnetic punching, electromagnetic flanging, electromagnetic bulging and electromagnetic connection respectively.

Both the punching die core and the flanging die are in the shape of a circular tube, the punching die core is inserted into the installation through hole of the flanging die, and locked with bolts, and the inner cross section of the punching die core is a 90° right-angle cutting edge, which is easy to complete Punching and forming; the cross-section of the inner side of the flanging mold is arc-shaped, which is beneficial to the formation of lamination and flanging holes.

The connecting pipe fittings are fixed in the upper cover plate by bolts through the upper mold pressing plate, installed at the central axis symmetrical to the flange hole, and slide through the left and right bolts of the upper cover plate to perform electromagnetic connection. The side of the lower mold pressing plate is provided with outlets from the positive and negative stages of the circular flat coil. There is a positioning groove in the middle of the upper surface of the cylinder of the lower mold pressing plate for placing the circular flat coil.

After the flanging die and the punching die core are fixed with the lower mold pressing plate with bolts, the lower end faces of the flanging die and the punching die core are on the same level as the surface of the plate blank.

The 1040 aluminum alloy plate is used as the processing plate blank, and the capacitor is used to discharge the circular flat coil to complete the punching and forming; remove the punching die core, and then perform discharge flanging and forming; then open the telescopic rod to raise the bulging coil to the bulging mold The predetermined position to complete the discharge electromagnetic bulging forming; remove the bulging mold, slide the upper cover plate, use bolts to fix the upper mold pressing plate and the lower mold pressing plate to the flange hole after bulging, and use the capacitor to discharge the connecting coil to complete the electromagnetic bulging. connect.

The above descriptions are only 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 principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. The method for connecting plates and pipes based on magnetic pulse forming is characterized in that the specific steps of the method are: Step 1. Open a circular through hole in the center of the No. 2 base (12), and set up a positioning groove on the upper surface of the No. 2 base (12), install the lower mold pressing plate (14) in the groove, and place the No. 1 insulating block (15) is installed in the cylindrical structure of molded plate (14) in order to buffer the electromagnetic repulsion that circular plate coil (16) produces, and described circular plate coil (16) is arranged on No. 1 insulating block (15) ) within the cylindrical structure; Step 2, connect the positive and negative poles of the circular plate coil (16) to the positive and negative signal output terminals of the electromagnetic forming discharge system, and place the blank plate material (17) on the lower mold pressing plate (14), No. 1 insulating block (15 ) and the upper side of the circular plate coil (16), and the flanging mold (18) is placed on the upper side of the blank material (17), and the punching die core (19) is installed in the central hole of the flanging mold (18); Step 3, when the switch (1) of the electromagnetic forming discharge system is closed, the electromagnetic forming discharge system discharges the circular flat coil (16), and after the pulse current passes through the circular flat coil (16), it passes through the circular flat coil (16). A pulsed magnetic field is generated in the slab material (17), and an induced eddy current is generated on the surface of the slab material (17), and the pulsed magnetic field generated by the induced eddy current is opposite to the strong magnetic field rotation direction of the circular plate coil (16). Two magnetic fields generate mutually repulsive magnetic field forces, which promote the upward movement of the slab material (17) and the right-angled cutting edge of the punching die core (19), to complete the punching of the blank, and disconnect the switch (1); Step 4. Disassemble the punching die core (19) in step 3 from the flanging die (18), close the switch (1) again, and the electromagnetic forming discharge system discharges the circular flat coil (16), and the pulse current passes through the circular plate coil (16). After the flat plate coil (16), a pulsed magnetic field is generated in the circular flat plate coil (16), the blank material (17) is in the pulsed magnetic field, and an induced eddy current is generated on the surface of the blank plate material (17), and the pulsed magnetic field produced by the induced eddy current and The strong magnetic field of the circular plate coil (16) rotates in the opposite direction, and the two magnetic fields generate mutually repulsive magnetic force, which pushes the blank material (17) to move upwards to fit the flanging mold (18), and completes the blank material (17) The flanging is formed, and the switch (1) is disconnected; Step 5. Disassemble the flanging mold (18) in step 5 from the slab material (17), disassemble the circular flat coil (16) from the groove of the No. 1 insulating block (15), and place the expansion Forming mold (25) is sleeved on the outside of the slab material (17) after flanging, and utilizes No. 1 upper cover plate (20) to fix bulging mold (25) by screw; Step 6. Install one end of the telescopic rod (8) on the No. 1 base (6) through bolts, and the steel core bushing (7) and the bulging coil (9) are both sleeved on the rod body of the telescopic rod (8). And the bulging coil (9) is arranged near the top of the telescopic rod (8); Step 7: Make the telescopic rod (8) stretch, and send the bulging coil (9) on the top of the telescopic rod (8) into the hole after the flanging of the blank material (17), and the electromagnetic forming discharge system will The coil (9) discharges, and the hole after the flanging is subjected to the effect of electromagnetic force and fits the bulging mold (25), so that small corrugated protrusions are produced around the flanging hole, and the base plate material (17 ) After the flanging, the hole wall is corrugated and bulging; Step 8: heat-treat the flanging hole of the slab material (17) after step 7 corrugated bulging, and carry out surface derusting on the overlapping area of the flanging hole, and place the bulging mold (25) and the No. 1 upper The cover plate (20) is disassembled from the blank plate material (17), and the connecting pipe fitting is fixed in the through hole of the upper molding plate (23), and the No. 2 insulating block (21) is sleeved on the outside of the connecting pipe fitting, and A connection coil (22) is sleeved between the No. 2 insulating block (21) and the connecting pipe fitting, and the No. 2 insulating block (21) is arranged on the lower side of the upper mold pressing plate (23); Step 9: Set the upper mold pressing plate (23) and the flanging hole of the base plate material (17) coaxially, press the upper mold pressing plate (23) and the lower mold pressing plate (14), so that the turning of the base plate material (17) The side hole is plugged into the connecting pipe fitting; Step 10. Extend the telescopic rod (8), remove the bulging coil (9), and send the steel core sleeve (7) at the bottom of the telescopic rod (8) into the slab material (17) after corrugated bulging In the flanging hole, the top height of the steel core bushing (7) is placed flush with the top height of the flanging hole, and placed coaxially with the flanging hole and the connecting pipe fitting; the positive and negative signal output terminals of the electromagnetic forming discharge system are connected to the The positive and negative signal input ends of the connecting coil (22) are connected, the electromagnetic forming discharge system discharges the connecting coil (22), and the electromagnetic forming discharge system discharges the connecting coil instantaneously. When the generated pulse magnetic field force is greater than the yield limit of the connecting pipe, The pipe fitting and the flanging plate generate a magnetic pulse connection joint in the overlapping area to complete the connection between the connecting pipe fitting and the blank material (17). 2. The method for connecting plates and pipes based on magnetic pulse forming according to claim 1, characterized in that step 7 also includes the step of installing one end of the telescopic rod (8) to the No. 1 base (6) through bolts. 3. The method for connecting plates and pipes based on magnetic pulse forming according to claim 1, characterized in that step 8 also includes heat-treating the flanging hole of the blank material (17) after step 7 corrugated bulging, And the sub-step of surface derusting is carried out on the overlapping area of the flanging hole. 4. A connecting device for plates and pipes based on magnetic pulse forming, characterized in that the device includes an electromagnetic forming discharge system, a No. 1 base (6), a steel core bushing (7), a telescopic rod (8), and a bulging coil ( 9), No. 2 base (12), lower mold pressing plate (14), No. 1 insulating block (15), circular flat coil (16), blank plate material (17), flanging die (18), punching die core ( 19), No. 1 upper cover plate (20), No. 2 insulating block (21), connecting coil (22), upper mold pressing plate (23) and bulging mold (25); The center of the No. 2 base (12) is provided with a circular through hole, and a positioning groove is provided on the upper surface of the No. 2 base (12). Cylindrical structure, the bottoms of the lower molding plate (14) and the No. 1 insulating block (15) are provided with circular through holes, and the No. 1 insulating block (15) is installed in the cylindrical structure of the lower molding pressing plate (14), The circular through hole of the No. 1 insulating block (15) has the same diameter as the circular through hole at the bottom of the lower mold pressing plate (14), and the circular plate coil (16) is installed in the cylindrical structure of the No. 1 insulating block (15). and the circular through hole on the No. 1 insulating block (15), the circular through hole on the bottom surface of the No. 2 base (12) and the circular through hole on the bottom surface of the No. 1 insulating block (15) are coaxially arranged; The top surface of the No. 1 insulating block (15) is located on the same level as the top surface of the lower molding plate (14); the base plate material (17) is installed on the horizontal plane where the top surface of the No. 1 insulating block (15) is located; The flanging mold (18) is a cylindrical structure with upper and lower openings, and the flanging mold (18) is used for flanging the blank material (17) after punching; turning the blank material (17) During the edge, the flanging mold (18) is fixed on the upper side of the slab material (17), and is coaxially arranged with the No. 1 insulating block (15); The punching die core (19) is a cylindrical structure with an valgus edge at the upper port; the punching die core (19) is used for punching the base plate material (17), and when the base plate material (17) is punched, The cylindrical structure of the punching die core (19) is plugged in the cylindrical structure of the flanging die (18), and the eversion edge of the punching die core (19) is fixed on the upper surface of the flanging die (18); The electromagnetic forming discharge system is used to supply power to the circular flat coil (16) when flanging and punching the blank material (17); to supply power to the bulging coil (9) when corrugating the blank material (17); Supply power to the connecting coil (22) when connecting with the blank material (17); The bulging coil (9) is used to be plugged into the hole after the flanging of the blank material (17), and after the electromagnetic forming discharge system performs corrugated bulging on the wall of the hole after the flanging of the blank material (17); the bulging coil (9) sleeved on the rod body of the telescopic rod (8), the telescopic rod (8) is fixedly installed in the center of the No. 1 base (6); The steel core sleeve (7) is used to sleeve on the rod body of the telescopic rod (8) when the pipe fitting is connected to the blank material (17) and insert it into the flanging hole of the blank material (17) after corrugated bulging , the top height of the steel core bushing (7) is placed flush with the top height of the flanging hole, and placed coaxially with the flanging hole and the connecting pipe fitting; No. 2 insulating block (21), connecting coil (22) and upper mold pressing plate (23) form a crimping structure; the crimping structure is used to sleeve the outside of the connecting pipe fitting when connecting the connecting pipe fitting with the blank material (17) ; Both the No. 2 insulating block (21) and the upper mold pressing plate (23) are cylindrical structures with upper and lower openings. The cylindrical structure of the No. 2 insulating block (21) is clamped with a connecting coil (22), and the connecting coil (22) is a disc-shaped structure, and the upper surface of the No. 2 insulating block (21) is attached to the surface of the upper mold pressing plate (23); the second insulating block (21), the connecting coil (22) and the upper molding pressing plate (23) Coaxial setting. 5. The device for connecting plates and pipes based on magnetic pulse forming according to claim 4, characterized in that it also comprises two No. 1 columns (11) and a No. 1 cover plate (20); Two No. 1 columns (11) are all fixed on the No. 2 base (12), and the two No. 1 columns (11) are respectively located on both sides of the lower mold pressing plate (14), and the No. 2 base (12) The central axis of the center axis is arranged axisymmetrically; two ends of the No. 1 cover plate (20) are provided with two sockets, and two No. 1 columns (11) are plugged into the two sockets respectively, and the No. 1 cover plate ( 20) be fixed on the two No. 1 columns (11) by fastening bolts, and the No. 1 cover plate (20) is used for inserting bolts, and the bolts are used for flanging molds (18) or bulging molds ( 25) Perform fixation. 6. The device for connecting plates and pipes based on magnetic pulse forming according to claim 5, characterized in that it also comprises two No. 2 columns (13) and No. 2 cover plates (24); Two No. 2 columns (13) are all fixed on the No. 2 base (12), and the two No. 1 columns (11) are respectively located on both sides of the lower mold pressing plate (14), and the No. 2 base (12) The central axis of the center axis is axisymmetrically arranged; the two ends of the No. 2 cover plate (24) have two sockets, and two No. 2 columns (13) are plugged into the two sockets respectively, and the No. 2 cover plate ( 24) Fix on the two No. 2 columns (13) by fastening bolts, the No. 2 cover plate (24) is used to plug in the bolts, and the bolts are used to connect the No. 2 insulating block (21) and the upper mold pressing plate (23) Fix. 7. The device for connecting plates and pipes based on magnetic pulse forming according to claim 4, characterized in that the inner cross-section of the bottom end of the punching die core (19) is a 90° right-angle cutting edge. 8. The connecting device for plates and pipes based on magnetic pulse forming according to claim 4, characterized in that the electromagnetic forming discharge system includes a switch (1), an energy storage capacitor (2), a current limiting resistor (3), a rectifier ( 4) and step-up transformer (5); One end of the switch (1) is simultaneously connected to one end of the energy storage capacitor (2) and one end of the secondary coil of the step-up transformer (5), and the other end of the secondary coil of the step-up transformer (5) is connected to the power signal input of the rectifier (4) end, the other end of the rectifier (4) is connected to one end of the current limiting resistor (3), the other end of the current limiting resistor (3) is connected to the other end of the energy storage capacitor (2), and the other end of the current limiting resistor (3) It is the positive power signal output terminal of the electromagnetic forming discharge system, and the other end of the switch (1) is the negative power signal output terminal of the electromagnetic forming discharge system.