Thin-wall part electromagnetic forming device with bearing die

Abstract

A large-scale thin-wall component can be machined through traditional electromagnetic forming, however, due to the fact that the back side of a workpiece lacks a support, the position of the large-scale thin-wall component is uncertain after the large-scale thin-wall component is stressed, and the machining precision is not high. According to the scheme, the thin-wall part electromagnetic forming device with the bearing die is adopted, the multiple bearing columns which are arranged in the transverse row and can stretch out and draw back independently are arranged in the bearing die, the ends of the bearing columns are used for abutting against a workpiece plate, displacement of a workpiece caused by electromagnetic impact can be effectively limited, and the electromagnetic forming precision is improved.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic forming processing, in particular to an electromagnetic forming device for thin-walled parts with a receiving die. Background Art

[0002] Large-scale thin-walled components are key structural parts for high-end carriers in aerospace and other fields. Their high-performance forming and manufacturing technology is an urgent need for many equipment to develop in the direction of large-scale, lightweight and high reliability. However, this type of component involves complex forming of thin walls and large curved surfaces, and the material strength and post-forming performance requirements are high, which makes its forming and manufacturing difficult. Traditional integral forming and manufacturing methods such as stamping and hydraulics face problems such as easy wrinkling and cracking of components, and the formable size is severely restricted by the tonnage of the equipment. As the scale of the component increases, petal forming and welding methods have to be adopted, which is complicated and greatly reduces the overall performance of the component.

[0003] Electromagnetic forming is a high-energy rate special energy field manufacturing method that uses pulsed electromagnetic force to perform plastic processing on metal components. Compared with traditional quasi-static forming methods, it has the characteristics of non-contact, high strain rate and single mold. It has outstanding advantages in improving the forming limit and precision of materials and reducing the demand for tooling. It is considered to be one of the technologies with great development potential for realizing high-performance forming and manufacturing of large-scale thin-walled components. However, the existing electromagnetic forming technology is still mainly based on single-step (single) forming. Under the development trend of large-scale components, due to the rapid attenuation of electromagnetic force with distance, the existing electromagnetic force loading method faces problems such as insufficient electromagnetic force loading and limited precision of large-scale electromagnetic force control, which makes it difficult to meet the needs of actual applications.

[0004] Currently, the above defects can be overcome by using the method of regional electromagnetic forming. However, due to the wide variety of workpieces, the situation is more complicated when processing in different regions. It is impossible to specially make stop back molds in multiple regions for each workpiece. In the absence of support on the back side of the workpiece, the final position of the thin-walled part after deformation under force is uncertain, resulting in low processing accuracy. Utility Model Content

[0005] The utility model provides an electromagnetic forming device for thin-walled parts with a receiving die, which solves the problem of low processing precision due to lack of back support in electromagnetic forming processing.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: an electromagnetic forming device for thin-walled parts with a receiving mold, including a receiving mold and an electromagnetic forming assembly, the receiving mold and the electromagnetic forming assembly are respectively distributed on both sides of the workpiece plate, the receiving mold and the electromagnetic forming assembly are each provided with a universal adjustment table on the side away from the workpiece plate so that the angles of the receiving mold and the electromagnetic forming assembly can swing, the electromagnetic forming assembly is provided with a coil plate facing the workpiece plate, the receiving mold includes a cavity seat, a plurality of independently retractable receiving columns are provided in the cavity seat, the plurality of receiving columns are arranged in a horizontal row, and the ends of the receiving columns are used to abut against the workpiece plate.

[0007] In a preferred embodiment, the cavity seat includes a plurality of liquid cavities arranged in an array, and a piston portion is provided at one end of each receiving column. The piston portion is slidably connected to the liquid cavity, and the piston portion divides the liquid cavity into a first chamber and a second chamber. The first chamber is provided with a liquid inlet and outlet hole, and the second chamber is provided with an air groove connected to the outside.

[0008] In the preferred embodiment, the receiving mold includes a cavity seat and a positioning plate, the cavity seat and the positioning plate are in contact with each other on one side, the positioning plate is provided with a through hole at each liquid cavity port, each through hole is provided with a sliding bushing, and each receiving column is slidably connected with the sliding bushing.

[0009] In the preferred scheme, the electromagnetic forming assembly is arranged on the upper side of the workpiece plate, and the electromagnetic forming assembly includes a forming assembly base frame and a movable frame. The forming assembly base frame is provided with multiple movable frame guide rods, and the movable frame is slidably connected to the movable frame guide rods. The coil plate is arranged at the lower end of the movable frame, and a counterweight block is provided at the upper end of the movable frame.

[0010] In the preferred solution, the universal adjustment table includes a swing plate and an adjustment table base frame, the swing plate is connected to the receiving mold or the electromagnetic forming component, a ball joint seat is provided in the center of the swing plate and the adjustment table base frame, the swing plate and the adjustment table base frame are connected through the ball joint seat, and the adjustment table base frame is also provided with an electric cylinder or a plurality of threaded adjustment rod devices, and one end of each electric cylinder or adjustment rod device is against the end face of the swing plate near the edge.

[0011] In the preferred scheme, a limiting screw sleeve is provided at one end of the adjusting rod device, a sliding cavity is provided inside the adjusting rod device, and a sliding rod is also provided. One end of the sliding rod is slidably connected to the sliding cavity, and a stop shoulder is provided in the middle of the sliding rod. The stop shoulder is used to abut against the bottom end of the limiting screw sleeve. The sliding rod is also provided with an extending portion, which passes through the bottom end of the limiting screw sleeve. A retaining spring is provided in the limiting screw sleeve, and both ends of the retaining spring abut against the adjusting rod device and the stop shoulder respectively. The cross-sections of the sliding cavity, the sliding rod and the extending portion are not circular.

[0012] The beneficial effects of the utility model are as follows: a receiving mold is arranged on the back side of the workpiece, and the receiving mold can adjust the end face shape. After the electromagnetic coil applies force, the workpiece is deformed and stopped by the receiving mold, thereby effectively controlling the deformation displacement of the workpiece and ensuring the processing accuracy of each step; the receiving mold and the electromagnetic forming component can both swing to adapt to the angle of the outer edge curved surface of the workpiece and can adapt to different workpieces; the electromagnetic forming component adopts a movable frame with a counterweight block that can be moved upward to convert the instantaneous reaction force during the forming process into momentum, thereby reducing the impact force on the base frame, which is conducive to the miniaturization of the equipment and the control of costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the arrangement of the electromagnetic forming components and the receiving mold.

[0015] Figure 2 It is a cross-sectional view of the receiving mold.

[0016] Figure 3 It is the plan layout of the receiving columns of the receiving mold.

[0017] Figure 4 It is a schematic diagram of the electromagnetic forming assembly and the universal adjustment table.

[0018] Figure 5 It is a cross-sectional view of the adjusting rod device.

[0019] Figure 6 This is the schematic diagram of electromagnetic forming.

[0020] Figure 7 This is a schematic diagram of an electric cylinder type universal adjustment table.

[0021] In the figure: receiving mold 1; cavity seat 101; receiving column 102; piston part 103; liquid cavity 104; positioning plate 105; sliding bushing 106; rear cover 107; liquid inlet and outlet holes 108; air groove 109; electromagnetic forming component 2; coil plate 201; movable frame 202; counterweight block 203; forming component base frame 204; movable frame guide rod 205; stop block 206; shock-absorbing sleeve 207; fixed table 3; clamping ring 4; universal adjustment table 5; swing plate 501; adjustment table base frame 502; ball joint seat 503; adjustment rod device 6; sleeve 601; sliding cavity 602; sliding rod 603; stop shoulder 604; extension part 605; limit screw sleeve 606; retaining spring 607; electric cylinder 608; workpiece plate 7. DETAILED DESCRIPTION

[0022] like Figure 1-7In the invention, an electromagnetic forming device for thin-walled parts with a receiving mold comprises an annular base, annular movable frames are arranged at the upper and lower ends of the annular base, each annular movable frame is provided with a forward frame, a vertical movable frame which can be vertically moved is arranged at the front end of the forward frame, a fixed platform is arranged in the center of the annular base, and also comprises a receiving mold 1 and an electromagnetic forming component 2, the receiving mold 1 and the electromagnetic forming component 2 are respectively connected to each vertical movable frame, the receiving mold 1 and the electromagnetic forming component 2 are respectively distributed on both sides of a workpiece plate 7, a universal adjustment table 5 is respectively arranged on the side of the receiving mold 1 and the electromagnetic forming component 2 away from the workpiece plate 7 so that the angle of the receiving mold 1 and the electromagnetic forming component 2 can be swung, the electromagnetic forming component 2 is provided with a coil plate 201 facing the workpiece plate 7, the receiving mold 1 comprises a cavity seat 101, a plurality of independently retractable receiving columns 102 are arranged in the cavity seat 101, the plurality of receiving columns 102 are arranged in a horizontal row, and the ends of the receiving columns 102 are used to abut against the workpiece plate 7.

[0023] The coil plate 201 is provided with a coil therein, and the coil plate 201 is charged by a capacitor, so that the coil plate 201 generates eddy currents on the workpiece plate 7, and the eddy current electric field is opposite to the coil electric field, generating a repulsive force.

[0024] The workpiece plate 7 is installed in the central hollow of the annular fixing platform 3, and the outer edge of the workpiece plate 7 is pressed and locked by the clamping ring 4.

[0025] The receiving mold 1 is used to support the back side of the workpiece plate 7. When the cavity seat 101 is charged and force is applied, the entire or partial position of the workpiece plate 7 is depressed by force until the back side contacts the receiving mold 1 and is stopped by the receiving mold 1, and finally formed. Since the receiving columns 102 of the receiving mold 1 can be adjusted to fit the set curve, the final deformation position of the workpiece plate 7 is determined, and the forming accuracy is controllable and high.

[0026] In a preferred embodiment, the cavity seat 101 includes a plurality of liquid cavities 104 arranged in an array, and a piston portion 103 is provided at one end of each receiving column 102. The piston portion 103 is slidably connected to the liquid cavity 104, and the piston portion 103 separates the liquid cavity 104 into a first chamber and a second chamber. The first chamber is provided with a liquid inlet and outlet hole 108, and the second chamber is provided with an air groove 109 connected to the outside.

[0027] A rear cover 107 is provided at one end of each liquid cavity 104, and the rear cover 107 is threadedly connected to the liquid cavity 104, and can be sealed by pipe thread plus thread sealant. The liquid inlet and outlet hole 108 is provided in the center of the rear cover 107, and a quick-plug connector can be installed.

[0028] The inlet and outlet holes 108 are connected to the valve island of the external hydraulic system. The hydraulic system includes a liquid pump, a flow regulating valve, a pressure regulating valve, etc. The valve island is provided with multiple electromagnetic reversing valves. The hydraulic system can independently control the total amount of liquid in each first chamber to ensure that the receiving column 102 extends or retracts to a specified length. The air groove 109 is connected to the outside to balance the air pressure in the second chamber during the movement of the receiving column 102.

[0029] In the preferred embodiment, the receiving mold 1 includes a cavity seat 101 and a positioning plate 105. The cavity seat 101 and the positioning plate 105 are in contact with each other on one side. The positioning plate 105 is provided with a through hole at the port of each liquid cavity 104. A sliding bushing 106 is provided in each through hole. Each receiving column 102 is slidably connected with the sliding bushing 106.

[0030] In the preferred scheme, the electromagnetic forming component 2 is arranged on the upper side of the workpiece plate 7, and the electromagnetic forming component 2 includes a forming component base frame 204 and a movable frame 202. A plurality of movable frame guide rods 205 are provided on the forming component base frame 204. The movable frame 202 is slidably connected to the movable frame guide rods 205. The coil plate 201 is arranged at the lower end of the movable frame 202, and a counterweight block 203 is provided at the upper end of the movable frame 202.

[0031] A stop block 206 is provided at the end of the movable frame guide rod 205 , and a shock absorbing sleeve 207 is sleeved on the movable frame guide rod 205 . One end of the shock absorbing sleeve 207 is connected to the stop block 206 , and the other end of the shock absorbing sleeve 207 is used to stop the movable frame 202 .

[0032] When the coil plate 201 exerts instantaneous impact force on the workpiece plate 7, it is subjected to a reaction force, causing the movable frame 202 to rise, and the reaction force overcomes gravity to do work and is eventually consumed. The movable frame 202 falls back and is stopped by the shock-absorbing sleeve 207, which is made of a flexible material such as rubber or silicone.

[0033] By converting the instantaneous impact force into the momentum of the coil plate 201, the movable frame 202 and the counterweight block 203, the final force received by the forming component base frame 204 is less than one tenth of the original force, which greatly reduces the instantaneous impact. In addition, the forming component base frame 204 does not require a large structural strength and can be made very small, which greatly improves space utilization and saves costs.

[0034] In the preferred embodiment, the universal adjustment table 5 includes a swing plate 501 and an adjustment table base frame 502, the swing plate 501 is connected to the receiving mold 1 or the electromagnetic forming component 2, a ball joint seat 503 is provided in the center of the swing plate 501 and the adjustment table base frame 502, the swing plate 501 and the adjustment table base frame 502 are connected through the ball joint seat 503, and an electric cylinder 608 or a plurality of threaded adjustment rod devices 6 are also provided on the adjustment table base frame 502, and one end of each electric cylinder 608 or adjustment rod device 6 abuts against the end face of the swing plate 501 near the edge.

[0035] Rotating the adjusting rod device 6 can adjust the extension length of the adjusting rod device 6. An adjusting rod device 6 can be set at each of the four corners of the swing plate 501. The extension length of each adjusting rod device 6 is coordinated to adjust the angle of the swing plate 501, so as to adjust the direction of the receiving mold 1 or the coil plate 201.

[0036] In the preferred scheme, a limiting screw sleeve 606 is provided at one end of the adjusting rod device 6, a sliding cavity 602 is provided inside the adjusting rod device 6, and a sliding rod 603 is also provided. One end of the sliding rod 603 is slidably connected to the sliding cavity 602, and a stop shoulder 604 is provided in the middle of the sliding rod 603. The stop shoulder 604 is used to abut against the bottom end of the limiting screw sleeve 606. The sliding rod 603 is also provided with an extension portion 605, which passes through the bottom end of the limiting screw sleeve 606. A retaining spring 607 is provided inside the limiting screw sleeve 606, and both ends of the retaining spring 607 abut against the adjusting rod device 6 and the stop shoulder 604 respectively. The cross-sections of the sliding cavity 602, the sliding rod 603 and the extending portion 605 are not circular.

[0037] The cross-sections of the sliding cavity 602, the sliding rod 603 and the extension portion 605 may be regular hexagons to facilitate the transmission of torque.

[0038] The other end of the adjusting rod device 6 is further provided with a sleeve 601 . The sleeve 601 can be made of a high-strength and wear-resistant material, and the sleeve 601 is replaceable.

[0039] The limiting screw sleeve 606 is adjustable to adjust the initial holding force of the holding spring 607 and the position of the extension 605 relative to the adjusting rod device 6. The angle of the swing plate 501 can be adjusted by automatically rotating each adjusting rod device 6 through a six-axis robot with an electric batch.

[0040] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An electromagnetic forming device for thin-walled parts with a receiving die, characterized in that: The invention comprises a receiving die (1) and an electromagnetic forming assembly (2), wherein the receiving die (1) and the electromagnetic forming assembly (2) are respectively distributed on two sides of a workpiece plate (7), and a universal adjustment table (5) is respectively provided on one side of the receiving die (1) and the electromagnetic forming assembly (2) away from the workpiece plate (7) so that the angles of the receiving die (1) and the electromagnetic forming assembly (2) can be swung, and the electromagnetic forming assembly (2) is provided with a coil plate (201) facing the workpiece plate (7). The receiving die (1) comprises a cavity seat (101), and a plurality of independently retractable receiving columns (102) are provided in the cavity seat (101), and the plurality of receiving columns (102) are arranged in a horizontal row, and the ends of the receiving columns (102) are used to abut against the workpiece plate (7).

2. The thin-walled part electromagnetic forming device with a receiving mold according to claim 1 is characterized in that: The cavity seat (101) comprises a plurality of liquid cavities (104) arranged in an array, and each receiving column (102) is provided with a piston portion (103) at one end, the piston portion (103) is slidably sleeved with the liquid cavity (104), and the piston portion (103) divides the liquid cavity (104) into a first chamber and a second chamber, the first chamber is provided with a liquid inlet and outlet hole (108), and the second chamber is provided with an air groove (109) connected to the outside.

3. The electromagnetic forming device for thin-walled parts with a receiving mold according to claim 2, characterized in that: The receiving mold (1) comprises a cavity seat (101) and a positioning plate (105), wherein the cavity seat (101) and the positioning plate (105) are in contact with each other on one side, and the positioning plate (105) is provided with a through hole at the port of each liquid cavity (104), and each through hole is provided with a sliding bushing (106), and each receiving column (102) is slidably sleeved with the sliding bushing (106).

4. The electromagnetic forming device for thin-walled parts with a receiving die according to claim 1, characterized in that: The electromagnetic forming assembly (2) is arranged on the upper side of the workpiece plate (7), and comprises a forming assembly base frame (204) and a movable frame (202). A plurality of movable frame guide rods (205) are arranged on the forming assembly base frame (204), and the movable frame (202) is slidably connected to the movable frame guide rods (205). The coil plate (201) is arranged at the lower end of the movable frame (202), and a counterweight block (203) is arranged at the upper end of the movable frame (202).

5. The electromagnetic forming device for thin-walled parts with a receiving mold according to claim 1, characterized in that: The universal adjustment platform (5) comprises a swing plate (501) and an adjustment platform base frame (502); the swing plate (501) is connected to a receiving mold (1) or an electromagnetic forming assembly (2); a ball joint seat (503) is provided in the center of the swing plate (501) and the adjustment platform base frame (502); the swing plate (501) and the adjustment platform base frame (502) are connected via the ball joint seat (503); an electric cylinder (608) or a plurality of threaded adjustment rod devices (6) are also provided on the adjustment platform base frame (502); one end of each electric cylinder (608) or adjustment rod device (6) abuts against the end surface of the swing plate (501) near the edge.

6. The electromagnetic forming device for thin-walled parts with a receiving mold according to claim 5, characterized in that: A limiting screw sleeve (606) is provided at one end of the adjusting rod device (6), a sliding cavity (602) is provided in the adjusting rod device (6), and a sliding rod (603) is also provided. One end of the sliding rod (603) is slidably sleeved with the sliding cavity (602), a stop shoulder (604) is provided in the middle of the sliding rod (603), and the stop shoulder (604) is used to abut against the bottom end of the limiting screw sleeve (606). The sliding rod (603) is also provided with an extension portion (605), and the extension portion (605) passes through the bottom end of the limiting screw sleeve (606). A retaining spring (607) is provided in the limiting screw sleeve (606), and two ends of the retaining spring (607) abut against the adjusting rod device (6) and the stop shoulder (604) respectively. The cross sections of the sliding cavity (602), the sliding rod (603) and the extension portion (605) are not circular.

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