Electromagnetic driving hydraulic punching-flanging integrated forming device and processing method

Abstract

The application belongs to the technical field of plate electromagnetic forming, and discloses an electromagnetic driving hydraulic blanking-flanging integrated forming device, which comprises: a straight-hole blanking die and a punch used in cooperation; a pressure chamber, which is in sealed connection with the punch and forms a cavity for containing liquid or gas; the cutting edge of the straight-hole blanking die is opposite to the liquid or gas contained in the cavity; a plate to be processed is located between the cutting edge of the straight-hole blanking die and the pressure chamber; a forming coil is arranged at the bottom of the punch; the forming coil comprises an insulating block and an electromagnetic coil fixed on the insulating block, the electromagnetic coil is connected with a pulse current loop through a wire, the electromagnetic force generated by the discharge of the forming coil drives the liquid or gas to impact the plate to be processed, the plate to be processed is cut by the cutting edge of the die and continuously impacted by the liquid or gas to realize flanging and close contact with the die edge and realize film pasting. A processing method for processing the plate by using the above device is also provided. The device and the method have the advantages of strong shape control ability and high forming precision.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic forming technology, specifically to an electromagnetically driven hydraulic punching-flanging integrated forming device and processing method. Background Technology

[0002] Flanging is a forming process that transforms the straight or curved edges of sheet metal into vertical edges or beveled edges at a certain angle. It can alter the shape of metal sheets, strengthen the edges, and improve the strength of parts, and is used in important applications such as aircraft door panels and fuel tanks. Currently, the main forming method for flanged parts is traditional cold stamping. This involves fixing the sheet metal between a blank holder and a straight-hole punching die at room temperature, and then pressing the sheet metal into the die with a punch to achieve the flanging. However, cold stamping involves high-cost molds, especially for high-yield-strength alloys. Excessive residual stress can easily cause springback, and the punch can easily scratch the surface of the part during impact. Insufficient lubrication can also lead to breakage. Furthermore, the part must be pre-machined with a circular hole shape before flanging, increasing the process and forming errors.

[0003] Compared to traditional stamping processes, electromagnetic forming technology relies primarily on non-contact electromagnetic force to deform sheet metal, effectively avoiding surface damage caused during stamping. It also utilizes inertia to increase the forming height. However, electromagnetic force typically decays rapidly during electromagnetic forming, making it difficult to control the forming precision of parts. Furthermore, electromagnetic coils are limited by the small forming area of ​​the flanged parts; fewer coil turns result in lower electromagnetic force. Increasing the voltage to increase electromagnetic force increases equipment costs, increases the risk of coil damage, and poses safety risks. Additionally, traditional electromagnetic stamping coils have poor versatility; a single coil can typically only form parts of one shape or size. For metals with poor conductivity, such as titanium alloys, a single electromagnetic forming method is insufficient. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the deficiencies and defects mentioned in the background art above, and to provide an electromagnetically driven hydraulic punching-flanging integrated forming device and processing method with strong shape control capability and high forming accuracy. To solve the above technical problem, the technical solution proposed by this invention is: an electromagnetically driven hydraulic punching-flanging integrated forming device, comprising:

[0005] The straight hole punching die and punch used in conjunction with it;

[0006] Pressure chamber, which is sealed to the punch and forms a cavity for holding liquid or gas;

[0007] The cutting edge of the straight hole punching die faces the liquid or gas contained in the cavity;

[0008] The sheet material to be processed is located between the cutting edge of the straight hole punching die and the pressure chamber;

[0009] A forming coil is located at the bottom of the punch. The forming coil includes an insulating block and an electromagnetic coil fixed on the insulating block. The electromagnetic coil is connected to a pulse current circuit through a wire. The forming coil discharges to generate electromagnetic force to drive liquid or gas to impact the workpiece. The workpiece is cut by the die edge and continuously subjected to the liquid or gas impact force to achieve flanging and die bonding.

[0010] In one embodiment, the cutting edge is rectangular or inclined on at least one side in the vertical direction. The bottom of the cutting edge of the straight hole punching die is a plane or a curved surface. The straight hole punching die includes a fixed part and a split die working part, which is a detachable component.

[0011] In one embodiment, a heating device is provided at the bottom edge of the straight hole punching die near the cutting edge.

[0012] In one embodiment, a forming coil is provided at the bottom edge of the straight hole punching die near the cutting edge, and an annular part is provided outside the forming coil. When the forming coil is energized, the annular part deforms away from the forming coil to squeeze liquid or gas.

[0013] In one embodiment, the punch includes an annular punch and a guide post disposed within the annular punch, the guide post extending to the bottom edge near the straight hole punching die, the annular punch moving up and down along the guide post; the annular punch and the guide post form an annular cavity, in which liquid or gas is placed.

[0014] In one embodiment, when the sheet material to be processed is aluminum alloy, the pressure chamber is connected to a cooling device, which is used to reduce the temperature of the liquid or gas in the pressure chamber to an ultra-low temperature.

[0015] A processing method for an electromagnetically driven hydraulic punching-flanging integrated forming device, employing the electromagnetically driven hydraulic punching-flanging integrated forming device as described above, includes the following steps:

[0016] S1: Place the sheet material to be processed between the straight hole punching die and the punch;

[0017] S2: Connect the pulse current circuit of the electromagnetic coil, discharge to generate electromagnetic force to make the punch move upward, thereby driving the liquid or gas to impact the plate to be processed. The plate to be processed gradually arches and thins at the cutting edge of the straight hole punching die.

[0018] After being continuously impacted by liquid or gas, the S3 blank material breaks at the cutting edge of the straight hole punching die and is then subjected to the impact force of the liquid or gas to achieve flanging and die bonding.

[0019] In one embodiment, an electric current is passed through the expansion coil, and the ring-shaped part is squeezed to compress liquid or gas, thereby increasing the local pressure and causing the flanged area of ​​the sheet metal to adhere tightly to the mold edge.

[0020] In one embodiment, the heating device is activated to heat the sheet material to be processed before the pulse current circuit of the electromagnetic coil is switched on.

[0021] In one embodiment, before the pulse current circuit of the electromagnetic coil is turned on, a groove of a predetermined depth is made in the material to be processed at the position opposite the cutting edge.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The electromagnetic-driven hydraulic punching-flanging integrated forming device of the present invention can directly realize the one-step forming of part punching and flanging, avoiding frequent mold changes during the forming process, reducing processing steps, improving forming efficiency, and achieving high forming accuracy. The electromagnetic-driven hydraulic punching-flanging integrated forming device of the present invention has better versatility. The driving device only requires one forming coil, and various complex shapes can be flanged by changing the shape of the cutting edge of the straight hole punching die. The electromagnetic force and liquid pressure can be increased by increasing the number of turns of the forming coil, making it suitable for most alloy materials. It does not require a driving plate with high conductivity, reducing material consumption. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an electromagnetically driven hydraulic punching-flanging integrated forming device according to one embodiment.

[0025] Figures 2(a) and 2(b) are schematic diagrams of the structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment;

[0026] Figure 3 A schematic diagram of the straight hole punching die structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment.

[0027] Figures 4(a) and 4(b) are schematic diagrams of the cutting edge structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to one embodiment.

[0028] Figures 5(a) and 5(b) are schematic diagrams of the cutting edge structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment.

[0029] Figures 6(a) and 6(b) are schematic diagrams of the cutting edge structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment.

[0030] Figure 7 Schematic diagrams showing the cutting edge shapes and corresponding product structures for different implementation methods;

[0031] Figure 8 A schematic diagram of an electromagnetically driven hydraulic punching-flanging integrated forming device with a heating device according to one embodiment.

[0032] Figures 9(a) and 9(b) are schematic diagrams of the structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment.

[0033] Figures 10(a) and 10(b) are schematic diagrams of the structure of an electromagnetically driven hydraulic punching-flanging integrated forming device according to another embodiment.

[0034] Figure 11 This is a schematic diagram of an electromagnetically driven hydraulic punching-flanging integrated forming device with a cooling device, according to another embodiment.

[0035] Figures 12(a), 12(b) and 12(c) are schematic diagrams of a processing method using an electromagnetically driven hydraulic punching-flanging integrated forming device according to one embodiment.

[0036] Figures 13(a) and 13(b) are schematic diagrams showing the pre-drilled groove structure of a sheet metal to be processed according to one embodiment.

[0037] Figure Descriptions: 1. Straight hole punching die; 101. Cutting edge; 102. Bottom edge of straight hole punching die; 103. Fixed part of split die; 104. Working part of split die; 2. Plate to be processed; 3. Pressure chamber; 4. Liquid or gas; 5. Rubber gasket; 6. Punch; 7. Forming coil; 8. Insulating block; 9. Electromagnetic coil; 10. Heating device; 12. Guide post; 13. Ring punch; 14. Ring coil; 15. Cooling device; 16. Ring part; 17. Expanding coil. Detailed Implementation

[0038] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0039] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0040] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0041] Please see Figure 1-1 3. An embodiment of the electromagnetically driven hydraulic punching-flanging integrated forming device includes: a straight hole punching die 1 and a punch 6 used in conjunction, a pressure chamber 3 located at the bottom edge 102 of the straight hole punching die, and a forming coil 7 disposed at the bottom of the pressure chamber 3. The pressure chamber 3 is sealed to the punch 6 and forms a cavity for holding liquid or gas, i.e., the pressure chamber 3. When the forming coil 7 provides electromagnetic force, the air pressure or hydraulic pressure in the pressure chamber 3 increases and pushes the workpiece 2 to be processed upward toward the cutting edge 101. The cutting edge 101 of the straight hole punching die 1 is located at the bottom edge 102 of the straight hole punching die. The forming coil 7 is disposed at the bottom of the punch 6. The forming coil 7 includes an insulating block 8 and an electromagnetic coil 9 fixed on the insulating block 8. The electromagnetic coil 9 is connected to a pulse current circuit through a wire. The forming coil 7 discharges to generate electromagnetic force to drive liquid or gas to impact the workpiece 2 to be processed. The workpiece 2 is cut by the cutting edge 101 and continuously subjected to the impact force of liquid or gas to achieve flanging and adhere to the die edge to achieve film adhesion.

[0042] The aforementioned electromagnetically driven hydraulic punching-flanging integrated forming device can directly achieve one-step forming of parts punching and flanging, avoiding frequent mold changes during the forming process, reducing processing steps, improving forming efficiency, and achieving high forming accuracy. This device also boasts greater versatility, requiring only one forming coil. By changing the shape of the cutting edge 101 of the straight hole punching die 1, various complex shapes can be flanged. The number of coil turns can be increased by improving the bottom structure of the punch 6, thereby increasing the electromagnetic force and liquid pressure. It is suitable for most alloy materials and does not require a high-conductivity drive plate, reducing material consumption. The number of coil turns in the forming coil 7 can be increased to enhance the electromagnetic force.

[0043] Specifically, please refer to Figure 1 In one embodiment, as shown in Figure 1, the bottom of the cutting edge 101 of the straight hole punching die 1 is a plane. Figure 1 By using either a straight line or a curved surface (Figure 2), flanged parts can be obtained. Preferably, in one embodiment, please refer to... Figure 3The straight hole punching die 1 includes a split die fixing part 103 and a split die working part 104. The split die working part 104 includes the location of the cutting edge and is a detachable component. Due to the easy wear of the cutting edge 101, the split die working part 104 is detachable for replacement. It can also be replaced according to different product shapes, reducing costs caused by die wear and enabling the processing of products with multiple shapes. In one embodiment, the pressure chamber 3 has an inflation port. When the impact force provided in the pressure chamber 3 is gas pressure, the pressure chamber 3 is first inflated.

[0044] In one embodiment, referring to Figure 4, the cutting edge 101 is rectangular or inclined on at least one side in the vertical direction. Of course, the cutting edge 101 can also have other shapes, the specific shape of which is designed according to product needs. For example, referring to Figures 5-6, liquid or gas flows in the direction of the arrow. Figures 5-6 show that different shapes of the cutting edge 101 correspond to different directions of liquid or gas movement. Figure 7 The invention demonstrates how different shapes of products are formed due to variations in the shape of the cutting edge 101. In other words, the molding device of this application can control the flow direction of liquid or gas by changing the angle of the cutting edge 101, resulting in slightly different pressures on the sheet material 2 to be processed. Furthermore, the shape of the cutting edge 101 can be changed according to product requirements to achieve the forming of flanged parts of different shapes. The actual shape of the cutting edge 101 is not limited to... Figure 7 As shown, it can be designed according to product needs.

[0045] Please see Figure 8 In one embodiment, preferably, a heating device 10 is provided on the bottom edge 102 of the straight hole punching die near the cutting edge 101. The heating device 10 can achieve local heating of the sheet material 2 to be processed, so that the material in the heated area is softened, which is beneficial for the sheet material 2 to be punched open to achieve flanging and die application.

[0046] Referring to Figure 9, in one embodiment, preferably, a forming coil 17 is located at the bottom edge 102 of the straight hole punching die near the cutting edge 101, and an annular member 16 is provided outside the forming coil 17. After the forming coil 17 is energized, the annular member 16 deforms away from the forming coil 17, squeezing out liquid or gas. The forming coil 17 drives the annular member 16 to expand and deform, which can further squeeze out liquid or gas, thereby increasing the local gas or liquid pressure and making the effect of the die adhered to the flange area of ​​the sheet metal 2 to be processed better.

[0047] Referring to Figure 10, in one embodiment, preferably, the punch 6 includes an annular punch 13 and a guide post 12 disposed within the annular punch 13. The guide post extends to the bottom edge 102 near the straight hole punching die, and the annular punch 13 moves up and down along the guide post 12. The annular punch 13 and the guide post 12 form an annular cavity in which liquid or gas is placed. In use, the middle part of the sheet material 2 to be processed is pressed by the guide post 12 and the straight hole punching die 1. Using the punch of this embodiment, only the guide post 12 is impacted around the annular cavity or gas. This structure can further increase the pressure of the sheet material 2 at the cutting edge 101, which is beneficial to improving the cutting and die-fitting accuracy of the sheet material 2.

[0048] Please see Figure 11 In one embodiment, preferably, when the sheet material 2 to be processed can be an aluminum alloy, the pressure chamber 3 is connected to a cooling device 15. The cooling device 15 is used to lower the liquid or gas in the pressure chamber 3 to an ultra-low temperature. Specifically, the cooling device 15 provides cold air through liquid nitrogen. This is because ordinary alloys are more likely to soften at higher temperatures, but aluminum alloys have improved plasticity and strength at ultra-low temperatures (close to the liquid nitrogen ambient temperature).

[0049] In one embodiment, the insulating block 8 can be an insulating material block such as an epoxy block (epoxy resin), a nylon block, or a polytetrafluoroethylene block.

[0050] Please refer to Figure 12. In one embodiment, the method for processing sheet metal using the above-described electromagnetically driven hydraulic punching-flanging integrated forming device includes the following steps:

[0051] S1: Place the sheet material 2 to be processed between the straight hole punching die 1 and the punch 6;

[0052] S2: Connect the pulse current circuit of the electromagnetic coil 9, discharge to generate electromagnetic force to make the punch 6 move upward, thereby driving the liquid or gas to impact the plate 2 to be processed. The plate 2 to be processed gradually arches and thins at the cutting edge 101 of the straight hole punching die 1.

[0053] S3: After being continuously impacted by liquid or gas, the plate 2 to be processed breaks at the cutting edge 101 of the straight hole punching die 1 and is subjected to the impact force of liquid or gas to achieve flanging and mold application.

[0054] Preferably, in one embodiment, current is passed through the expansion coil 17, and the annular part 16 then squeezes liquid or gas, thereby increasing the local pressure and making the flanged area of ​​the sheet material 2 to be processed stick tightly to the mold edge.

[0055] Preferably, in one embodiment, before connecting the pulse current circuit of the electromagnetic coil 9, the step of starting the heating device 15 to heat the plate 2 to be processed is further included.

[0056] Preferably, referring to Figure 13, in one embodiment, before activating the pulse current circuit of the electromagnetic coil 9, the step further includes: creating a groove 201 of a predetermined depth on the sheet material 2 to be processed, directly opposite the cutting edge 101, to obtain a pre-grooved sheet material, which is beneficial for faster punching of thicker or more difficult-to-break sheets. Preferably, the groove of the predetermined depth is located near the opposite side of the die-attachment away from the cutting edge 101. This results in a longer die-attachment side, better die-attachment effect, and higher precision.

[0057] In the electromagnetically driven hydraulic punching-flanging integrated forming device and method of the present invention, the punching and flanging of parts can be directly realized in one step, avoiding frequent mold changes during the forming process, reducing processing steps, and improving forming efficiency. The electromagnetically driven hydraulic punching-flanging integrated forming device and method of the present invention has better versatility. Only one forming coil 1 is needed to achieve flanging forming of various complex shapes by changing the straight hole punching die 1 or the split die working part 104 of the straight hole punching die 1. By changing the forming angle of the cutting edge 101 of the straight hole punching die 1, the flow direction of liquid or gas can be controlled, and the pressure in the forming area can be improved. The distribution improves the die-fitting accuracy of the flanged parts; the number of coil turns can be increased by improving the bottom structure of the punch 6, thereby increasing the electromagnetic force and the pressure on the liquid or gas, so as to ensure that the sheet material 2 to be processed can be cut and improve the formability; the heating device 15 can achieve local heating of the sheet material 2 to achieve a softening effect, further improving the formability of the sheet material 2; it is suitable for most alloy materials, does not require the setting of a drive plate with high electrical conductivity, and reduces material consumption; and by setting the straight or curved bottom edge 102 of the straight hole punching die, the forming of planar or curved parts and the flanging of planar or curved parts can be achieved simultaneously.

Claims

1. A sheet metal electromagnetically driven hydraulic punching-flanging integrated forming device, characterized in that, include: The straight hole punching die and punch used in conjunction with it; Pressure chamber, which is sealed to the punch and forms a cavity for holding liquid or gas; The cutting edge of the straight hole punching die faces the liquid or gas contained in the cavity; The sheet material to be processed is located between the cutting edge of the straight hole punching die and the pressure chamber; A forming coil is set at the bottom of the punch. The forming coil includes an insulating block and an electromagnetic coil fixed on the insulating block. The electromagnetic coil is connected to a pulse current circuit through a wire. The forming coil discharges to generate electromagnetic force to drive liquid or gas to impact the workpiece. The workpiece is cut by the die edge and continuously subjected to the liquid or gas impact force to achieve flanging. The bottom edge of the straight hole punching die is provided with an expanding coil near the cutting edge, and an annular part is provided outside the expanding coil. When the expanding coil is energized, the annular part deforms and moves away from the expanding coil, thereby squeezing liquid or gas. The punch includes an annular punch and a guide post disposed within the annular punch. The guide post extends to the bottom edge of the straight hole punching die, and the annular punch moves up and down along the guide post. The annular punch and the guide post form an annular cavity in which liquid or gas is placed.

2. The electromagnetically driven hydraulic punching-flanging integrated forming device according to claim 1, characterized in that, The cutting edge is rectangular or inclined on at least one side in the vertical direction. The bottom of the cutting edge of the straight hole punching die is a plane or a curved surface. The straight hole punching die includes a fixed part and a split die working part, which is a detachable component.

3. The electromagnetically driven hydraulic punching-flanging integrated forming device according to claim 1, characterized in that, A heating device is provided at the bottom edge of the straight hole punching die near the cutting edge.

4. The electromagnetically driven hydraulic punching-flanging integrated forming device according to claim 1, characterized in that, When the sheet material to be processed is aluminum alloy, the pressure chamber is connected to a cooling device, which is used to reduce the temperature of the liquid or gas in the pressure chamber to ultra-low temperature.

5. A processing method for an electromagnetically driven hydraulic punching-flanging integrated forming device, characterized in that, The electromagnetically driven hydraulic punching-flanging integrated forming device as described in any one of claims 1-4 includes the following steps: S1: Place the sheet material to be processed between the straight hole punching die and the punch; S2: Connect the pulse current circuit of the electromagnetic coil, discharge to generate electromagnetic force to make the punch move upward, thereby driving the liquid or gas to impact the plate to be processed. The plate to be processed gradually arches and thins at the cutting edge of the straight hole punching die. After being continuously impacted by liquid or gas, the S3 sheet material breaks at the cutting edge of the straight hole punching die and is then formed by the impact force of the liquid or gas.

6. The processing method according to claim 5, characterized in that, When current is passed through the expansion coil, the ring-shaped part is squeezed to compress the liquid or fluid, thereby increasing the local pressure and making the flanged area of ​​the sheet metal stick tightly to the mold edge.

7. The processing method according to claim 5, characterized in that, Before connecting the pulse current circuit of the electromagnetic coil, start the heating device to heat the material to be processed.

8. The processing method according to claim 5, characterized in that, Before connecting the pulse current circuit of the electromagnetic coil, a groove of a preset depth is made on the material to be processed, directly opposite the cutting edge.

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