A combined stamping forming die for a galvanized steel sheet

Abstract

The application belongs to the technical field of galvanized steel plate processing, in particular to a combined stamping forming die for galvanized steel plate, which comprises a base, a back baffle fixed on the base, a support plate assembly rotatably assembled on the back baffle and having a changeable included angle for supporting the galvanized steel plate, and a male die arranged above the support plate assembly and used for stamping and bending the galvanized steel plate. An angle adjusting driving assembly is connected with the support plate assembly and used for driving the included angle of the support plate assembly to gradually decrease according to a set step. The 90° large-angle bending is decomposed into multiple small-angle progressive bendings, the deformation amount is small each time, the instantaneous high temperature (flash temperature) of the contact point between the R angle of the male die and the steel plate is significantly reduced, thereby effectively avoiding the problem that the galvanizing layer is peeled off due to high temperature softening, and the integrity of the galvanizing layer after bending is improved. Meanwhile, the whole process is automatically circulated, the angle does not need to be adjusted by manual intervention, the production efficiency is high, and the quality of finished products is stable.

Description

Technical Field

[0001] This invention relates to the field of galvanized steel sheet processing technology, specifically a combined stamping die for galvanized steel sheets. Background Technology

[0002] Galvanized steel sheet is a composite steel sheet with a zinc protective layer. It is made by plating metallic zinc onto a regular carbon steel substrate. The excellent corrosion resistance of zinc in the atmosphere significantly enhances the steel sheet's rust resistance, making it widely used in automobile manufacturing, appliance housings, building ventilation ducts, electrical control cabinets, and other fields. In actual production, galvanized steel sheets often need to be stamped and formed into specific bending shapes such as L-shapes according to product structural requirements to meet subsequent assembly or structural load-bearing needs.

[0003] Currently, cold stamping is the most common method for bending galvanized steel sheets. This process typically includes the following steps: First, a stamping oil film is applied to the surface of the steel sheet to reduce the coefficient of friction. Then, the steel sheet is fed into the inside of a die, where the side walls of the die restrict the lateral movement of the sheet while simultaneously pushing it forward until one edge is flush with the back gauge, completing the initial positioning. Finally, the stamping equipment is started, and the stamping head (punch) presses down, causing the steel sheet to bend plastically in the middle section, ultimately forming the desired L-shaped or other bent shape. This process has advantages such as high production efficiency, low cost, and good surface quality, and is currently the mainstream method for bending galvanized steel sheets. However, the existing cold stamping process still has significant shortcomings in practical applications: In current technology, the process standards for galvanized steel sheets produced by different manufacturers vary. In some galvanized steel sheets circulating in the market, the furnace atmosphere and temperature parameters during the annealing process are not optimally controlled, causing alloying elements in the steel to migrate to the steel sheet surface and oxidize at high temperatures. This oxide layer hinders the normal reaction between aluminum elements in the subsequent zinc bath and the steel substrate, resulting in an uneven and discontinuous inhibitory layer formation. This leads to a reduction in the initial adhesion between the galvanized layer and the steel substrate. When a large bending angle (e.g., 90°) needs to be formed in one step, the contact area between the R-angle region of the punch and the bending point of the steel sheet will generate instantaneous high temperatures (i.e., "flash temperature") due to intense friction and plastic deformation of the material. Although the overall average temperature of cold stamping is much lower than the melting point of zinc (about 419°C), flash temperature can significantly soften the galvanized layer in this area, causing a sharp decrease in its cohesion and adhesion, making it easier for the galvanized layer to peel off from the steel substrate surface, thus affecting the production quality of galvanized steel sheets. Therefore, a combined stamping die for galvanized steel sheets is proposed to address the above problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0005] The technical solution adopted by this invention to solve its technical problem is: a galvanized steel sheet combined stamping die, comprising: The base has a rear baffle fixed to it. The support plate assembly includes: a first support plate, one end of which is rotatably mounted on one side of the rear baffle; and a second support plate, one end of which is hinged to one end of the first support plate. The hinge point is the rotatable assembly point of the first support plate and the rear baffle. The two support plates rotate on the fixed end point of the rear baffle and have a changeable included angle for supporting the galvanized steel plate. The punch is vertically mounted above the support plate assembly and is used to punch and bend the galvanized steel sheet. The angle adjustment drive assembly includes: a lifting frame, a first power source fixedly installed on the rear baffle, the first power source driving the lifting frame to move, the lifting frame being connected to the support plate assembly, used to drive the included angle of the support plate assembly to gradually decrease according to a set step, and to reset the adjusted angle; The photoelectric triggering component includes: a photoelectric sensor transmitter, a photoelectric sensor receiver, and a partition plate. The photoelectric sensor transmitter and the photoelectric sensor receiver are mounted on the rear baffle plate. The partition plate is driven by a second power source and is used to separate the photoelectric sensor transmitter and the photoelectric sensor receiver so as to detect the rebound action of the punch after each stamping and send out a trigger signal. The lifting and adsorption assembly includes an adhesive block and a third power source. The third power source is located inside the base and is used to drive the adhesive block to rise before the angle changes, so as to lift the galvanized steel plate away from the support plate assembly, and to place the steel plate back onto the support plate assembly after the angle changes.

[0006] Preferably, the photoelectric triggering component includes: a photoelectric sensor transmitter and a photoelectric sensor receiver fixed to one side of the rear baffle and arranged opposite to each other; a sliding partition plate, which is normally located on the upper side between the photoelectric sensor transmitter and the photoelectric sensor receiver; a sliding rod fixedly connected to the partition plate; a spring sleeved on the sliding rod, one end fixed to the partition plate and the other end connected to the fixing frame; a fixing frame fixed to one side of the rear baffle; a downward moving frame is fixed on the punch, which can press down the sliding rod when the punch moves down to move the partition plate between the photoelectric sensor transmitter and the photoelectric sensor receiver to block the light path; when the punch rises, the spring pulls the sliding rod and the partition plate to reset, and the photoelectric sensor receiver outputs a trigger signal the instant the light path is restored.

[0007] Preferably, a shaped strip is fixedly connected to one side of the rear baffle, two guide rods are fixedly connected to the lower side of the shaped strip, two connecting plates are fixedly connected to one side of the rear baffle, the two connecting plates are respectively fixedly connected to the two guide rods, and sleeve plates are fixedly connected to both sides of the lower end of the lower frame, the two guide rods pass through the two sleeve plates respectively, and the two sleeve plates are slidably connected to the two guide rods respectively.

[0008] Preferably, the lifting and adsorption assembly includes: a second servo hydraulic cylinder fixed to the inner side of the base; a movable frame fixedly connected to the output end of the second servo hydraulic cylinder, the movable frame having multiple upwardly extending ends; multiple bonding blocks, respectively rotatably assembled to each end of the movable frame, each bonding block having a torsion spring between it and the end of the movable frame to keep the bonding block facing upward; and each bonding block having a receiving groove on its upper surface, with an electromagnet fixed in the receiving groove.

[0009] Preferably, a support frame is fixedly connected to the upper side of the base, and a buffer pad is fixedly connected to one side of the support frame. The buffer pad and the movable frame are used in conjunction.

[0010] Preferably, the support plate assembly includes: a first support plate, the rear end of which is rotatably mounted on one side of the rear baffle; a second support plate, one end of which is hinged to the front end of the first support plate; round rods are fixedly connected to the back sides of the first and second support plates respectively; two arc-shaped grooves are provided on the rear baffle, and the round rods pass through the arc-shaped grooves and slide within the arc-shaped grooves; a bearing is fixed to the end of the round rod.

[0011] Preferably, an arc-shaped strip is fixedly connected to the inner side of the arc-shaped groove, and the arc-shaped strip passes through the round rod.

[0012] Preferably, the angle adjustment drive assembly includes: a first servo hydraulic cylinder fixedly installed on the outside of the rear baffle; a lifting frame fixedly connected to the output end of the first servo hydraulic cylinder; and two bearings respectively connected to the lifting frame, wherein the bearings can slide and rotate along the inner side of the lifting frame.

[0013] Preferably, the extended support plate assembly has multiple connecting screws rotatably mounted on the same side of the first and second support plates; several sets of third and fourth support plates can be sleeved on each set of connecting screws, with the third and fourth support plates hinged together; each connecting screw is threaded with a nut for pressing and fixing the sleeved third or fourth support plate.

[0014] Preferably, a docking plate is fixedly connected to one side of each of the two sets of third and fourth support plates, and the third and fourth support plates, as well as the first and second support plates, are used in conjunction with the docking plate.

[0015] The advantages of this invention are: 1. The galvanized steel sheet combined stamping forming die of the present invention decomposes a 90° large-angle bend into multiple small-angle progressive bends. Each bend has a small deformation amount, and the instantaneous high temperature (flash temperature) at the contact point between the punch R angle and the steel sheet is significantly reduced, thereby effectively avoiding the problem of the galvanized layer falling off due to high temperature softening and improving the integrity of the galvanized layer after bending; at the same time, the whole process is automatically cyclical, without the need for manual intervention to adjust the angle, resulting in high production efficiency and stable finished product quality.

[0016] 2. The galvanized steel sheet combined stamping die of the present invention restricts the rotation trajectory of the support plate through the cooperation of the arc groove and the round rod, ensuring the repeatability accuracy of each angle adjustment, so that the bending line position is always consistent during multiple stamping processes, avoiding the problem of asymmetrical bending due to angle deviation; at the same time, the rolling friction of the bearing reduces the sliding resistance between the lifting frame and the round rod, making the angle adjustment smoother and the control more precise. Attached Figure Description

[0017] 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 In this invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the three-dimensional structure from another perspective in this invention; Figure 4 This is a schematic diagram of the punch structure in this invention; Figure 5 This is a schematic diagram of the structure of the rear baffle in this invention; Figure 6 This is a schematic diagram of the structure of the first support plate in this invention; Figure 7 This is a schematic diagram of the first support plate from another perspective in this invention; Figure 8 This is a schematic diagram of the structure of the active frame in this invention; Figure 9 This is a schematic diagram of the bonding block in this invention; Figure 10 This is a schematic diagram of the structure of the third and fourth support plates in this invention; Figure 11 This is a structural schematic diagram of the third and fourth support plates in this invention from another perspective.

[0019] In the diagram: 101, base; 102, rear baffle; 201, first support plate; 202, second support plate; 203, round rod; 204, arc groove; 205, bearing; 301, first servo hydraulic cylinder; 302, lifting frame; 401, lowering frame; 402, fixing frame; 403, partition plate; 404, slide rod; 405, spring; 406, photoelectric sensor transmitter; 407, photoelectric sensor receiver; 501, second servo hydraulic cylinder. 502. Cylinder; 503. Movable frame; 504. Adhesive block; 505. Torsion spring; 506. Receiving groove; 507. Electromagnet; 608. Connecting screw; 609. Third support plate; 600. Fourth support plate; 600. Nut; 600. Butt plate; 601. Groove; 702. Irregular strip; 703. Guide rod; 704. Connecting plate; 705. Arc strip; 706. Support frame; 707. Buffer pad; 801. Punch. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Specific implementation examples are given below.

[0022] Please see Figures 1 to 11 As shown in the embodiment of the present invention, a galvanized steel sheet combined stamping forming die is characterized by comprising: Base 101, with a rear baffle 102 fixed on base 101; The support plate assembly includes: a first support plate 201, one end of which is rotatably mounted on one side of the rear baffle 102; and a second support plate 202, one end of which is hinged to one end of the first support plate 201. The hinge point is the rotatable assembly point of the first support plate 201 and the rear baffle 102. The two rotate at fixed ends on the rear baffle 102 and have a changeable included angle for supporting the galvanized steel plate. The punch 801 is vertically mounted above the support plate assembly and is used to punch and bend the galvanized steel sheet. The angle adjustment drive assembly includes: a lifting frame 302, a first power source fixedly installed on the rear baffle 102, the first power source driving the lifting frame 302 to move, the lifting frame 302 being connected to the support plate assembly, and being used to drive the included angle of the support plate assembly to gradually decrease according to a set step, and to reset the adjusted angle. The photoelectric triggering component includes: a photoelectric sensor transmitter 406, a photoelectric sensor receiver 407, and a partition plate 403. The photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407 are mounted on the rear baffle 102. The partition plate 403 is driven by a second power source and is used to separate the photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407 so as to detect the rebound action of the punch 801 after each stamping and send out a trigger signal. The lifting and adsorption assembly includes: a bonding block 503 and a third power source. The third power source is located in the base 101 and is used to drive the bonding block 503 to rise before the angle changes, so as to lift the galvanized steel plate away from the support plate assembly, and to place the steel plate back onto the support plate assembly after the angle changes. Before implementation, it is worth noting that: in actual use, multiple drive devices and the stamping equipment connected to the punch 801 should be connected to a common PLC controller. The controller should use conventional components from existing technology to control each drive device. Each electric device should have its wiring and power connection set according to the actual situation. The upper plane of the punch 801 should be provided with a connector for connecting to the output end of the stamping equipment. The connector should be a conventional connector. The middle section of the lower frame 401 should be staggered from the lifting frame 302 to avoid mutual interference. The surface of the support plate assembly has multiple slots, and the multiple ends of the lifting and adsorption assembly pass through these slots so that the bonding block 503 can support the galvanized steel plate. In use, the galvanized steel plate is placed on the upper side of the support plate assembly, and the lifting adsorption assembly adsorbs and places it in a fixed position. The punch 801 presses down to initially bend the middle section of the steel plate. At this time, the included angle of the support plate assembly is relatively large (e.g., 170°), and the steel plate only bends slightly. When the punch 801 moves down, it drives the lowering frame 401 to press down the sliding rod 404, so that the partition plate 403 blocks the optical path of the photoelectric sensor. When the punch 801 rises, the spring 405 pulls the partition plate 403 to reset. The photoelectric trigger assembly sends a signal to the controller at the instant the optical path is restored. The controller controls the angle adjustment drive assembly to reduce the included angle of the support plate by one step (e.g., first to 130°, then to 90°). At the same time, the lifting adsorption assembly lifts the steel plate and moves it with the support plate. After the movement, the plate is repositioned; this process is repeated three times until the steel plate is finally bent to 90°. After the third adjustment, the controller controls the angle adjustment drive assembly to restore the included angle of the support plate to the initial 170°, completing one work cycle. After each downward press of the punch 801, it should remain stationary for a period of time to complete the pressure holding operation of the steel plate. At the same time, the angle of the punch 801 should be ensured to be 90°. Meanwhile, when the support plate assembly is bent to the limit angle, it should be at the same angle as the punch 801. This is so that when the galvanized steel plate completes the final 90° bend, the punch 801 and the support plate assembly can limit the upper and lower surfaces of the plate, achieving precise limitation of the final angle of the galvanized steel plate and ensuring that it can be bent to 90°.

[0023] In other words, by breaking down a 90° large-angle bend into multiple small-angle progressive bends, the deformation amount is small each time, and the instantaneous high temperature (flash temperature) at the contact point between the punch 801R angle and the steel plate is significantly reduced, thereby effectively avoiding the problem of the galvanized layer falling off due to high temperature softening and improving the integrity of the galvanized layer after bending; at the same time, the whole process is automatically cyclical, without the need for manual intervention to adjust the angle, resulting in high production efficiency and stable finished product quality.

[0024] Please see Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the support plate assembly includes: a first support plate 201, the rear end of which is rotatably mounted on one side of the rear baffle 102; a second support plate 202, one end of which is hinged to the front end of the first support plate 201; round rods 203 are fixedly connected to the back sides of the first support plate 201 and the second support plate 202 respectively; two arc-shaped grooves 204 are provided on the rear baffle 102, and the round rods 203 pass through the arc-shaped grooves 204 and slide within the arc-shaped grooves 204; a bearing 205 is fixed to the end of the round rod 203.

[0025] Before implementation, it is worth noting that: when using this support plate assembly, it is necessary to ensure that the hinge joint between the first support plate 201 and the second support plate 202 rotates flexibly without jamming; the inner wall of the arc groove 204 should be surface hardened to reduce wear; the bearing 205 should be a standard rolling bearing and lubricated regularly. When the angle adjustment drive assembly drives the round rod 203, the round rod 203 slides along the arc groove 204, and the first support plate 201 and the second support plate 202 rotate towards each other around the hinge point, with the included angle gradually decreasing; the trajectory of the arc groove 204 determines the angle change path.

[0026] In other words, the structure restricts the rotation trajectory of the support plate through the cooperation of the arc groove 204 and the round rod 203, ensuring the repeatability of the angle adjustment and making the bending line position consistent during multiple stamping processes, thus avoiding the problem of asymmetrical bending due to angle deviation. At the same time, the rolling friction of the bearing 205 reduces the sliding resistance between the lifting frame 302 and the round rod 203, making the angle adjustment smoother and the control more precise.

[0027] Please see Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, the angle adjustment drive assembly includes: a first servo hydraulic cylinder 301 fixedly installed on the outside of the rear baffle 102; a lifting frame 302 fixedly connected to the output end of the first servo hydraulic cylinder 301; and two bearings 205 respectively connected to the lifting frame 302, wherein the bearings 205 can slide and rotate along the inner side of the lifting frame 302.

[0028] Before implementation, it is worth noting that: when using this angle adjustment drive assembly, the first servo hydraulic cylinder 301 should be connected to the hydraulic control circuit of the PLC controller. Its stroke is precisely controlled by the controller according to the preset angle step size to ensure that its movement is sufficiently accurate. The surface of the lifting frame 302 has a groove, and the bearing 205 is placed in the groove and can slide and rotate along the groove. Lubricant should be applied to the groove to reduce friction. The lifting range of the lifting frame 302 should be limited within the effective stroke of the arc groove 204 to avoid exceeding the limit. After the controller receives the photoelectric trigger signal, the first servo hydraulic cylinder 301 pushes the lifting frame 302 up a fixed distance. The lifting frame 302 drives the bearing 205 and the round rod 203 to slide upward along the arc groove 204 through its groove, thereby driving the included angle of the support plate to decrease.

[0029] In other words, the use of servo hydraulic cylinders enables displacement control, ensuring consistent angle adjustments each time and avoiding inaccurate bending angles due to adjustment errors; at the same time, the hydraulic drive output force is large and stable, suitable for long-term continuous operation under stamping conditions, thus improving the reliability and service life of the device.

[0030] Please see Figure 1 and Figure 2 As shown, the photoelectric triggering assembly includes: a photoelectric sensor transmitter 406 and a photoelectric sensor receiver 407 fixed to one side of the rear baffle 102 and arranged opposite to each other; a vertically sliding partition 403, which is normally located on the upper side between the photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407; a slide rod 404 fixedly connected to the partition rod 403; and a spring 405 sleeved on the slide rod 404, one end of which is fixed to the partition rod 403, and the other end of which is fixed to the fixing frame 4. 02 Connection; A fixed frame 402 is fixed to one side of the rear baffle 102; A downward moving frame 401 is fixed on the punch 801. When the downward moving frame 401 moves down with the punch 801, it can press down the sliding rod 404 to move the partition plate 403 to block the light path between the photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407; When the punch 801 rises, the spring 405 pulls the sliding rod 404 and the partition plate 403 to reset. At the instant the light path is restored, the photoelectric sensor receiver 407 outputs a trigger signal.

[0031] Before implementation, it is worth noting that: when using this photoelectric triggering component, the photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407 should be aligned, and the response speed should meet the stamping frequency; the lower surface of the partition plate 403 should be flat and non-reflective to avoid false triggering due to light path reflection; the spring force of the spring 405 should be sufficient to overcome the gravity and friction of the slide rod 404 to ensure that the baffle quickly resets when the punch 801 rises; when the punch 801 moves down, the lower frame 401 presses down the slide rod 404, and the partition plate 403 blocks the light path; when the punch 801 rises, the spring 405 pulls the partition plate 403 to reset, and the photoelectric sensor receiver 407 outputs a pulse signal to the controller at the instant the light path goes from blocked to open.

[0032] In other words, this component uses the lifting and lowering motion of the punch 801 itself to generate a trigger signal, without the need for additional sensors or complex programming, and has a simple and reliable structure; and adopts the logic of "instantaneous triggering when the optical path is restored" (rather than triggering when the optical path is blocked), ensuring that the adjustment command is issued only after the punch 801 has completely left the steel plate, avoiding erroneous adjustment during the stamping process and improving the safety of the control timing.

[0033] Please see Figure 3 , Figure 8 and Figure 9 As shown, the lifting and adsorption assembly includes: a second servo hydraulic cylinder 501 fixed inside the base 101; a movable frame 502 fixedly connected to the output end of the second servo hydraulic cylinder 501, the movable frame 502 having multiple upwardly extending ends; multiple bonding blocks 503, which are rotatably assembled to each end of the movable frame 502, and a torsion spring 504 is provided between each bonding block 503 and the end of the movable frame 502 to keep the bonding block 503 with its plane facing upward; and an accommodating groove 505 is opened on the upper surface of each bonding block 503, and an electromagnet 506 is fixed in the accommodating groove 505.

[0034] Before implementation, it is worth noting that: when using this lifting and adsorption assembly, the second servo hydraulic cylinder 501 is connected to the PLC controller, and its lifting timing is coordinated with the angle adjustment drive assembly; the power supply of the electromagnet 506 is controlled by the controller through a relay, and the magnetic field strength should be sufficient to adsorb the galvanized steel plate; when in use, the torsion spring 504 can only keep the side of the bonding block 503 facing upwards, and when the bonding plate 503 is pressed against the lower side of the steel plate, it should be able to rotate easily. That is to say, the torque of the torsion spring 504 should not be too large, so as not to cause unnecessary interference to the rotation of the bonding plate 503. It is only necessary to ensure that when the bonding block 503 is not in contact with the steel plate, it can just drive the bonding plate 503 to face upwards, so that when it is in contact with the steel plate, its plane can easily be fully in contact with the steel plate; the end of the movable frame 502 passes through the groove on the surface of the support plate assembly, and leaves a sufficient gap with the groove wall, so that when in use, the end will not contact or interfere with the groove on the surface of the support plate assembly. After each bending of the steel plate, the second servo hydraulic cylinder 501 pushes the movable frame 502 upward. The bonding block 503 automatically adapts to the current bending angle of the steel plate and adheres to the lower surface under the action of the torsion spring 504. The electromagnet 506 is energized to attract the steel plate, and the movable frame 502 continues to rise, lifting the steel plate away from the support plate assembly. After the included angle of the support plate assembly is adjusted to the correct position, the movable frame 502 descends. The electromagnet 506 is not de-energized at this time, but moves downward, so that part of the steel plate is pressed against part of the support plate assembly. Then the punch 801 moves downward. Because the steel plate is attracted and fixed by the bonding plate 503 during the up and down movement, it is ensured that the bending point at its center position can always be aligned with the punch 801. When the punch 801 moves downward to further bend the steel plate, the electromagnet 506 is always energized, so the steel plate is always limited until the punch 801 moves downward. When the plate reaches the bending point of the steel plate and continues to be pressed down, the electromagnet is de-energized, so that the bonding plate 301 no longer attracts the steel plate. At the same time, it moves down synchronously with the punch 801, so that it will not interfere with the bending of the steel plate due to the fixed position support. Also, because it moves down synchronously with the punch 801, the bonding plate can still support the lower side of the steel plate. Combined with the downward pressure of the punch 801, the steel plate can easily maintain a fixed position. When the steel plate is pressed down, its lower side contacts the corresponding plane of the adjusted support plate assembly. The punch 801 continues to press down to further bend the middle section of the steel plate. The above process is repeated when the included angle of the inner side of the support plate assembly decreases again until the support plate assembly is bent to the maximum angle. Finally, the lower corner of the punch 801 bends the steel plate to 90° for shaping.

[0035] In other words, this component enables non-contact separation and repositioning of the steel plate and the support plate, avoiding friction, collision or displacement of the steel plate when the support plate rotates, and ensuring the consistency of the steel plate position before each bend; at the same time, the bonding block 503 can rotate to adapt to the shape of the lower side of the steel plate under different bending angles, which is highly versatile; the electromagnet 506 adsorption method is controllable and will not cause damage to the galvanized layer surface due to rigid clamping.

[0036] Please see Figure 3 , Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, the extended support plate assembly has multiple connecting screws 601 rotatably mounted on the same side of the first support plate 201 and the second support plate 202; several sets of third support plates 602 and fourth support plates 603 can be sleeved on each set of connecting screws 601, and the third support plates 602 and fourth support plates 603 are hinged; each connecting screw 601 is threaded with a nut 604 for pressing and fixing the sleeved third support plates 602 or fourth support plates 603. Before implementation, it is worth noting that the hinge edges of the two sets of third support plates 602 and the first support plate 201 with the fourth support plate 603 and the second support plate 202 should be set at right angles. This ensures that when the plates rotate relative to each other to form a 90-degree angle, the rotation between them will be rigidly restricted by the contact of the hinge edges of the two sets of third support plates 602 and the first support plate 201 with the fourth support plate 603 and the second support plate 202, further ensuring that the angle after rotation is 90 degrees. This makes the bending and forming of the galvanized steel sheet more stable. When using this extended support plate assembly, the connecting screw 601 should be perpendicular to the side of the first support plate 201 and the second support plate 202 and its axis should be parallel to the rotation axis. The nut 604 should be a lock nut to prevent loosening due to vibration. The hinge structure of the third support plate 602 and the fourth support plate 603 is the same as that of the main support plate to ensure synchronous rotation. During installation, determine the required number of sets based on the length of the galvanized steel plate, insert the connecting screws 601 in sequence, and then tighten the nuts 604 to make the extension support plate fit snugly and securely against the main support plate.

[0037] In other words, when it is necessary to process a long galvanized steel sheet, the support area can be extended by adding a third support plate 602 and a fourth support plate 603, so that the steel sheet can be evenly supported and avoid uneven deformation or warping when bending due to excessively long suspended parts. At the same time, the structure is a modular combination, which eliminates the need to manufacture multiple sets of molds for steel sheets of different lengths, greatly reducing equipment costs and improving the versatility and flexibility of the molds.

[0038] Please see Figure 1 , Figure 2 and Figure 5As shown, a shaped strip 701 is fixedly connected to one side of the rear baffle 102, and two guide rods 702 are fixedly connected to the lower side of the shaped strip 701. Two connecting plates 703 are fixedly connected to one side of the rear baffle 102, and the two connecting plates 703 are respectively fixedly connected to the two guide rods 702. Sleeves 704 are fixedly connected to both sides of the lower end of the lower frame 401. The two guide rods 702 pass through the two sleeves 704 respectively, and the two sleeves 704 are slidably connected to the two guide rods 702 respectively. Before implementation, it is worth noting that: the outer surface of the guide rod 702 should be lubricated, and the surface of the sleeve plate 704 should have a groove with the same cross-section as the guide rod 702, through which the guide rod 702 passes. The design shape of the irregular strip 701 should be as shown in the attached figure, so as to avoid the movement trajectory of the lower frame 401 and not to cause unnecessary limiting obstruction to the upward movement of the lower frame 401. When the lower frame 401 moves up and down, it will drive the sleeve plate 704 to move up and down simultaneously. The guide rod 702 set at fixed positions on both sides guides the sleeve plate 704 so that the sleeve plate 704 further guides the movement trajectory of the lower frame 401. That is, because the vertical part of the lower frame 401 is relatively long, when it moves, the guide rod 702 guides and limits the sleeve 704, so that the sleeve 704 further guides and limits the vertical part of the lower frame 401, making the movement trajectory of the lower frame 401 more stable. This makes it easier for its lower end to move down more stably to push the slide rod 404 down, further improving the stability of the device operation.

[0039] Please see Figure 10 and Figure 11 As shown, each of the two sets of third support plates 602 and fourth support plates 603 has a docking plate 605 fixedly connected to one side. The third support plate 602 and fourth support plate 603, as well as the first support plate 201 and the second support plate 202, are used in conjunction with the docking plate 605. Before implementation, it is worth noting that: a set of third support plates 602 and fourth support plates 603, as well as the first support plate 201 and the second support plate 202, are all provided with grooves 606 that can mate with the mating plate 605. When the two sets of third support plates 602 and fourth support plates 603 are mated, the mating plate 605 of the outermost set of third support plates 602 and fourth support plates 603 will be inserted into the grooves 606 of the middle set of third support plates 602 and fourth support plates 603, while the mating plate 605 of the middle set of third support plates 602 and fourth support plates 603 will be inserted into the grooves 606 at the corresponding positions inside the first support plate 201 and the second support plate 202, so as to complete the mating of the three sets of support structures. Then, by screwing the nut 604 onto the outside of the connecting screw 601, the two sets of third support plates 602 and fourth support plates 603 can be limited and reinforced. That is, when multiple sets of support plates are connected, the connecting plate 605 is inserted into the inside of the groove 606 to further increase the contact area between each support plate, making the connection between multiple sets of support plates more stable in synchronous drive and improving the stability of the device.

[0040] Please see Figure 3 , Figure 5 and Figure 7 As shown, an arc-shaped strip 705 is fixedly connected to the inner side of the arc-shaped groove 204, and the arc-shaped strip 705 passes through the round rod 203; Before implementation, it is worth noting that: the arc shape of the arc strip 705 and the arc groove 204 should be the same to ensure more stable guidance of the round rod 203. The surface of the round rod 203 is provided with a groove of the same shape as the arc strip 705, and the groove wall should fit the outer plane of the arc strip 705. The connection between the two should be lubricated, and the surface of the arc strip 705 should also be polished smooth to ensure that it will not cause unnecessary interference to the movement of the round rod 203. In use, the arc strip 705 passes through the round rod 203 to further guide and limit the round rod 203. That is, during use, the connection between the arc-shaped strip 705 and the round rod 203 makes the connection between the round rod 203 and the arc-shaped groove 204 more stable, thereby improving the stability of the device.

[0041] Please see Figure 3 and Figure 8 As shown, a support frame 706 is fixedly connected to the upper side of the base 101, and a buffer pad 707 is fixedly connected to one side of the support frame 706. The buffer pad 707 and the movable frame 502 are used together. Before implementation, it is worth noting that the height of the buffer pad 707 should be set so that when the movable frame 502 is raised to its maximum height, the upper side of its square plate portion will contact the buffer pad 707, so that when the movable frame 502 is raised to its maximum height during use, the buffer pad 707 will separate it from the lower side of the multiple support plates. In other words, during use, the buffer pad 707 further limits the movable frame 502, preventing it from rising excessively and contacting the lower sides of the multiple support plates, thus avoiding unnecessary vibration and collision and further improving the stability of the device.

[0042] Working principle: S1: Initial preparation and steel plate positioning The galvanized steel sheet is placed on the mating block 503 on the upper side of the first support plate 201 and the second support plate 202, so that the upper surface of the mating block 503 is in close contact with the lower surface of the steel sheet. The operator aligns the middle section of the steel sheet with the hinge joint of the first support plate 201 and the second support plate 202 to complete the initial positioning.

[0043] S2: Steel plate adsorption and fixed placement When electromagnet 506 is energized, it magnetizes the bonding block 503, causing it to tightly adhere to the steel plate. Then, the second servo hydraulic cylinder 501 moves the movable frame 502 downwards, causing the bonding block 503 to move downwards as well, smoothly placing the steel plate on the fixed position above the first support plate 201 and the second support plate 202. After placement, electromagnet 506 is de-energized, and the second servo hydraulic cylinder 501 continues to move the movable frame 502 downwards, causing the bonding block 503 to separate from the steel plate.

[0044] S3: First pressing of the punch (small angle bending) The stamping equipment drives the punch 801 to move downwards, bending the middle section of the steel plate. At this time, the included angle between the first support plate 201 and the second support plate 202 is relatively large (e.g., 170°), and the steel plate only undergoes a small bending, avoiding damage to the galvanized layer from the instantaneous high temperature. Simultaneously with the downward movement of the punch 801, the lowering frame 401 moves downwards, pressing down the sliding rod 404. The sliding rod 404 drives the partition plate 403 to move downwards, blocking the light path between the photoelectric sensor transmitter 406 and the photoelectric sensor receiver 407.

[0045] S4: Punch recovery and photoelectric triggering After the punch 801 completes its first stamping, it rises, and the lower frame 401 moves upward accordingly, no longer pressing down on the slide bar 404. The spring 405 unfolds, pulling the slide bar 404 and the partition plate 403 upward to reset, and the partition plate 403 no longer blocks the light path. At the instant the light path is restored from being blocked, the photoelectric sensor receiver 407 outputs a trigger signal to the PLC controller. During this process, the lifting and lowering of the lower frame 401 is guided and limited by the guide rod 702 and the sleeve plate 704 to ensure stable movement.

[0046] S5: Angle adjustment drive assembly reduces the included angle of the support plate. After receiving the trigger signal, the PLC controller controls the first servo hydraulic cylinder 301 to push the lifting frame 302 up a fixed distance. The lifting frame 302 drives the bearing 205 and the round rod 203 to slide upward along the arc-shaped groove 204 via the slide groove. The round rod 203 is simultaneously guided by the arc-shaped strip 705. The first support plate 201 and the second support plate 202 rotate towards each other around the hinge point, reducing the included angle between them by a step (e.g., from 170° to 130°). The arc-shaped strip 705 in the arc-shaped groove 204 further ensures the accuracy of the movement trajectory of the round rod 203.

[0047] S6: Lifting and adsorption components are repositioned in conjunction with the steel plate. Before the angle of the support plate decreases, the second servo hydraulic cylinder 501 synchronously pushes the movable frame 502 upward. Under the action of the torsion spring 504, the bonding block 503 automatically adapts to the current bending angle of the steel plate and tightly adheres to the lower surface of the steel plate. The electromagnet 506 is energized again, attracting the steel plate onto the bonding block 503. At this time, the steel plate is lifted by the bonding block 503 and detached from the support plate assembly, avoiding friction or collision with the steel plate when the support plate rotates. After the angle of the support plate is adjusted to the correct position, the movable frame 502 begins to descend, but the electromagnet 506 remains energized. The steel plate descends together with the bonding block 503 until the lower side of the steel plate makes slight contact with the upper surface of the adjusted support plate assembly (not yet fully pressed). At this time, the movable frame 502 pauses its descent, and the steel plate is attracted by the bonding block 503 and held at the position where it is about to contact the support plate.

[0048] S7: Second pressing and bending of the punch The punch 801 presses down for the second time. Before the punch 801 contacts the steel plate, the electromagnet 506 remains energized to keep the steel plate in a fixed position. When the radius (R) of the punch 801 is about to contact the bending point of the steel plate, the electromagnet 506 is immediately de-energized, releasing the steel plate. Simultaneously, the second servo hydraulic cylinder 501 drives the movable frame 502 to move the bonding block 503 downward in sync with the punch 801, ensuring that the bonding block 503 always supports the lower side of the steel plate. The punch 801 presses down, further bending the steel plate from the middle section (e.g., from 170° to 130°). Because the bonding block 503 moves downward in sync, the lower side of the steel plate is always supported by the bonding block 503, and the bending point is always aligned with the punch 801, preventing the steel plate from shifting during bending. After bending is complete, the punch 801 rises, repeating the triggering and angle adjustment process of S4-S5, further reducing the included angle of the support plate to 90°.

[0049] S8: Final bending and repositioning After the third bend (with the support plate angle adjusted to 90°), the galvanized steel sheet is finally formed into the required L-shape (90°). The photoelectric sensor receiver 407 sends a trigger signal again. At this time, the PLC controller controls the first servo hydraulic cylinder 301 to drive the lifting frame 302 back to its original position, so that the first support plate 201 and the second support plate 202 return to the initial 170° angle. At the same time, all actuators are reset, ready to process the next workpiece.

[0050] Extended Explanation (for steel plates of different lengths) When processing longer galvanized steel sheets, a third support plate 602 and a fourth support plate 603 can be added to the sides of the first support plate 201 and the second support plate 202. By fitting the third support plate 602 and the fourth support plate 603 onto the connecting screw 601, tightening the nut 604, and inserting the mating plate 605 into the groove 606, stable connection of multiple sets of support plates is achieved, extending the support area. Each set of support plates rotates synchronously, ensuring consistent angles along the entire support line.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A combined stamping die for galvanized steel sheet, characterized in that: include: A base (101) is provided with a rear baffle (102). The support plate assembly includes: a first support plate (201), one end of which is rotatably mounted on one side of the rear baffle (102); and a second support plate (202), one end of which is hinged to one end of the first support plate (201). The hinge point is the rotatable assembly point of the first support plate (201) and the rear baffle (102). The two rotate at fixed ends on the rear baffle (102) and have a changeable included angle for supporting the galvanized steel plate. The punch (801) is vertically mounted above the support plate assembly and is used to punch and bend the galvanized steel sheet; The angle adjustment drive assembly includes: a lifting frame (302), a first power source fixedly installed on the rear baffle (102), the first power source drives the lifting frame (302) to move, the lifting frame (302) is connected to the support plate assembly, and is used to drive the included angle of the support plate assembly to gradually shrink according to the set steps, and to reset the adjusted angle; The photoelectric triggering component includes: a photoelectric sensor transmitter (406), a photoelectric sensor receiver (407), and a partition plate (403). The photoelectric sensor transmitter (406) and the photoelectric sensor receiver (407) are mounted on the rear baffle (102). The partition plate (403) is driven by a second power source and is used to separate the photoelectric sensor transmitter (406) and the photoelectric sensor receiver (407) so as to detect the rebound action of the punch (801) after each stamping and send out a trigger signal. The lifting and adsorption assembly includes an adhesive block (503) and a third power source located in the base (101). The third power source is used to drive the adhesive block (503) to rise before the angle changes, so as to lift the galvanized steel plate away from the support plate assembly, and to place the steel plate back onto the support plate assembly after the angle changes.

2. The galvanized steel sheet combined stamping die according to claim 1, characterized in that: The photoelectric triggering assembly includes: a photoelectric sensor transmitter (406) and a photoelectric sensor receiver (407) fixed to one side of the rear baffle (102) and arranged opposite to each other; a vertically sliding partition (403), which is normally located on the upper side between the photoelectric sensor transmitter (406) and the photoelectric sensor receiver (407); a slide rod (404) fixedly connected to the partition rod (403); and a spring (405) sleeved on the slide rod (404), one end of which is fixed to the partition rod (403), and the other end of which is connected to the fixing frame (402). A fixed frame (402) is fixed to one side of the rear baffle (102); a downward frame (401) is fixed on the punch (801). When the downward frame (401) moves down with the punch (801), it can press down the slide rod (404) to move the partition plate (403) to block the light path between the photoelectric sensor transmitter (406) and the photoelectric sensor receiver (407); when the punch (801) rises, the spring (405) pulls the slide rod (404) and the partition plate (403) to reset. The photoelectric sensor receiver (407) outputs a trigger signal at the instant the light path is restored.

3. The galvanized steel sheet combined stamping die according to claim 2, characterized in that: A shaped strip (701) is fixedly connected to one side of the rear baffle (102). Two guide rods (702) are fixedly connected to the lower side of the shaped strip (701). Two connecting plates (703) are fixedly connected to one side of the rear baffle (102). The two connecting plates (703) are fixedly connected to the two guide rods (702) respectively. Sleeves (704) are fixedly connected to both sides of the lower end of the lower frame (401). The two guide rods (702) pass through the two sleeves (704) respectively. The two sleeves (704) are slidably connected to the two guide rods (702) respectively.

4. The galvanized steel sheet combined stamping die according to claim 3, characterized in that: The lifting and adsorption assembly includes: a second servo hydraulic cylinder (501) fixed inside the base (101); a movable frame (502) fixedly connected to the output end of the second servo hydraulic cylinder (501), the movable frame (502) having multiple upwardly extending ends; multiple bonding blocks (503), which are rotatably mounted on each end of the movable frame (502), and a torsion spring (504) is provided between each bonding block (503) and the end of the movable frame (502) to keep the bonding block (503) facing upward; and a receiving groove (505) is provided on the upper surface of each bonding block (503), and an electromagnet (506) is fixed in the receiving groove (505).

5. The galvanized steel sheet combined stamping die according to claim 4, characterized in that: A support frame (706) is fixedly connected to the upper side of the base (101), and a buffer pad (707) is fixedly connected to one side of the support frame (706). The buffer pad (707) and the movable frame (502) are used together.

6. The galvanized steel sheet combined stamping die according to claim 1, characterized in that: The support plate assembly includes: a round rod (203); the back of the first support plate (201) and the second support plate (202) are respectively fixedly connected to the round rod (203); the rear baffle (102) is provided with two arc-shaped grooves (204), the round rod (203) passes through the arc-shaped grooves (204) and slides in the arc-shaped grooves (204); the end of the round rod (203) is fixed with a bearing (205).

7. The galvanized steel sheet combined stamping die according to claim 6, characterized in that: An arc-shaped strip (705) is fixedly connected to the inner side of the arc-shaped groove (204), and the arc-shaped strip (705) passes through the round rod (203).

8. The galvanized steel sheet combined stamping die according to claim 7, characterized in that: The angle adjustment drive assembly includes: a first servo hydraulic cylinder (301) fixedly installed on the outside of the rear baffle (102); a lifting frame (302) fixedly connected to the output end of the first servo hydraulic cylinder (301); and two bearings (205) respectively connected to the lifting frame (302), and the bearings (205) can slide and rotate along the inner side of the lifting frame (302).

9. A galvanized steel sheet combined stamping die according to claim 8, characterized in that: Extended support plate assembly: Multiple connecting screws (601) are rotatably mounted on the same side of the first support plate (201) and the second support plate (202); several sets of third support plates (602) and fourth support plates (603) can be sleeved on each set of connecting screws (601), and the third support plate (602) and the fourth support plate (603) are hinged; each connecting screw (601) is threaded with a nut (604) for pressing and fixing the sleeved third support plate (602) or fourth support plate (603).

10. A galvanized steel sheet combined stamping die according to claim 9, characterized in that: Each of the two sets of third support plates (602) and fourth support plates (603) has a docking plate (605) fixedly connected to one side. The three sets of third support plates (602) and fourth support plates (603), as well as the first support plate (201) and second support plate (202), are used in conjunction with the docking plate (605).

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