A curved aluminum plate stamping and correcting die and a curved aluminum plate stamping and correcting method

Abstract

The application discloses a bending aluminum plate stamping and correcting die and a bending aluminum plate stamping and correcting method, relates to the technical field of aluminum product machining dies, and comprises a bending aluminum plate stamping and correcting die, which comprises a base. A ring-shaped guide groove is arranged in the inner side wall of the base, the ring-shaped guide groove extends along the circumferential direction of the inner side wall of the base, and the ring-shaped guide groove has an upward peak-valley section. The peak-valley section of the ring-shaped guide groove is matched with the movable end of a one-way overturning clamping mechanism, the rotating movement of a multi-station die is converted into overturning action, the pure mechanical linkage of "rotating and overturning" is realized, manual overturning or an independent overturning device is not needed, and the operation efficiency is greatly improved. The workpiece is automatically turned over from the front face upward to the back face upward in the die, the front face and the back face of the workpiece are respectively stamped and corrected through a first stamping station and a second stamping station, the springback problem caused by uneven double-face stress is eliminated, and the correction effect is better.

Description

Technical Field

[0001] This invention relates to the field of aluminum product processing mold technology, and in particular to a stamping straightening mold for bent aluminum plates and a stamping straightening method for bent aluminum plates. Background Technology

[0002] During the processing of aluminum products, aluminum sheets often become bent and deformed after stamping, bending, and other processes due to the release of internal residual stress, requiring stamping straightening to restore flatness. Currently, the most common stamping straightening method is single-sided stamping straightening, in which the bent aluminum sheet is placed in a mold and flattened and straightened by a stamping punch.

[0003] Existing stamping straightening dies are used to place bent aluminum plates inside the die and flatten and straighten them using a stamping punch. However, when straightening a single-sided stamping die, the bending deformation of the aluminum plate often involves uneven stress on both sides. Therefore, it is usually necessary to manually flip the plate or use a separate flipping device to complete the process. Then, the aluminum plate is stamped and straightened on both sides. The flipping process is separated from the stamping process, resulting in low operating efficiency. Furthermore, manual flipping poses positioning errors and safety hazards. Summary of the Invention

[0004] To improve the aforementioned stamping straightening dies, which typically require manual flipping or a separate flipping device for double-sided stamping straightening of aluminum plates, the flipping process is separated from the stamping process, resulting in low operational efficiency. Furthermore, manual flipping presents positioning errors and safety hazards.

[0005] This invention provides a stamping straightening die for bent aluminum plates and a stamping straightening method for bent aluminum plates, employing the following technical solution: A bending aluminum sheet stamping straightening die includes a base, and an annular guide groove is provided on the inner side wall of the base. The annular guide groove extends circumferentially along the inner side wall of the base and has an upward peak-valley section. The base is rotatably equipped with a multi-station mold. The multi-station mold has four mold slots evenly opened along the circumferential direction. Each mold slot is movably equipped with a one-way flipping clamping mechanism. The one-way flipping clamping mechanism has a movable end. The movable end extends outward along the radial direction of the multi-station mold and is inserted into the annular guide groove. The movable end slides in cooperation with the inner wall of the annular guide groove. A drive motor is fixedly installed at the bottom of the base, and the rotation axis of the drive motor extends upward into the base and is fixedly connected to the center of the bottom surface of the multi-station mold.

[0006] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, a top frame is fixedly connected to the top of the base, and two stamping cylinders are fixedly installed on the top frame. A stamping punch is fixedly connected to the extended end of each of the two stamping cylinders. The four mold slots are, in sequence, the workpiece placement station, the first stamping station, the second stamping station, and the workpiece unloading station along the rotation direction of the multi-station mold. The positions of the two stamping punches correspond vertically to the positions of the first stamping station and the second stamping station, respectively.

[0007] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, both ends of the inner wall of the die groove are provided with sliding grooves, and the two sliding grooves extend radially along the die groove and are arranged opposite to each other. Both of the two sliding grooves have inclined guide grooves at opposite ends. The depth of the bottom of the inclined guide grooves gradually changes along the extension direction of the sliding grooves, and the upper end of the inclined guide grooves is inclined towards the sliding grooves, while the lower end of the inclined guide grooves is inclined away from the sliding grooves.

[0008] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, the one-way flipping clamping mechanism includes a movable plate, the movable plate is U-shaped, the movable plate is slidably disposed in the die groove, and both ends of the movable plate are fixedly connected to flipping clamping parts, the flipping clamping parts are slidably disposed in the slide groove; A first guide rod is fixedly connected to the side wall of the movable plate. The first guide rod extends radially outward along the multi-station mold. The end of the first guide rod extends out of the multi-station mold and is inserted into the annular guide groove. The end of the first guide rod slides in cooperation with the inner wall of the annular guide groove. The first guide rod constitutes the movable end.

[0009] Optionally, in the above-mentioned bending aluminum sheet stamping straightening die, the flip-up clamping component includes a fixed plate and a clamping plate. The fixed plate is slidably disposed in the slide groove. A through hole is opened on the side of the fixed plate away from the clamping plate. A semi-circular block is fixedly connected to the inner wall of the through hole. A one-way bearing is fixedly inserted into the clamp plate, and a second guide rod is fixedly inserted into the inner ring of the one-way bearing. The axis of the second guide rod coincides with the rotation axis of the one-way bearing. The second guide rod passes through the through hole and the slide groove and is inserted into the inclined guide groove. The end of the second guide rod slides in contact with the inner wall of the inclined guide groove.

[0010] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, a rotating ring is rotatably provided on the side of the clamping plate facing the fixed plate. The rotating ring is coaxially arranged with the second guide rod. A return spring is fixedly connected to the end face of the rotating ring, and the end of the return spring away from the rotating ring is fixedly connected to the fixed plate. When the second guide rod separates from the inclined guide groove, the second guide rod loses the limit of the inclined guide groove, and the elastic restoring force of the return spring pushes the clamping plate to move closer to the fixed plate through the rotating ring, so that the clamping plate maintains the clamping and fixing state of the workpiece.

[0011] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, a spiral groove is provided on the outer wall of the end of the second guide rod facing the inclined guide groove, and a horizontal groove is provided on the outer wall of the end of the second guide rod facing the clamping plate. The horizontal groove extends along the axial direction of the second guide rod, and the horizontal groove and the spiral groove are interconnected. The semi-circular block slides in cooperation with the inner wall of the horizontal groove and the spiral groove.

[0012] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, the inner bottom wall of the base is provided with a blanking port, the position of the blanking port corresponds to the position of the workpiece ejection station in the vertical direction, and the bottom of the blanking port is fixedly connected with an inclined guide plate.

[0013] Optionally, in the above-mentioned bending aluminum plate stamping straightening die, the drive motor is used to drive the multi-station die to rotate in one direction. Each time the drive motor drives the multi-station die to rotate 90°, the four die slots are sequentially rotated to the next station, so that the workpiece passes through the workpiece placement station, the first stamping station, the second stamping station and the workpiece unloading station in sequence.

[0014] Another technical solution proposed in this invention: a method for straightening bent aluminum plates by stamping, comprising the following steps: S1: Workpiece placement step: Place the bent aluminum plate workpiece to be corrected into the mold groove at the workpiece placement station, drive the multi-station mold to rotate 90°, and transfer the mold groove and workpiece to the first stamping station. S2: Front stamping and straightening steps: The stamping cylinder above the first stamping station drives the stamping punch to move downward, and performs the first stamping and straightening of the front of the workpiece. The drive motor drives the multi-station mold to rotate 90° again, and transfers the mold slot and workpiece to the next station. S3: Workpiece flipping step: During the transfer process, the movable end of the one-way flipping clamping mechanism slides along the annular guide groove to the peak and valley section. The movable end is lifted upward by the peak and valley section, which drives the one-way flipping clamping mechanism to extend out of the mold groove. The one-way flipping clamping mechanism clamps and fixes the workpiece. Then, the one-way flipping clamping mechanism drives the workpiece to flip together, so that the reverse side of the workpiece faces upward. After the flipping is completed, the one-way flipping clamping mechanism drives the workpiece to fall back into the mold groove and releases the clamp. S4: Reverse stamping correction step: The drive motor drives the multi-station mold to rotate 90° again, transferring the mold slot and workpiece to the second stamping station. The stamping cylinder above the second stamping station drives the stamping punch to move downward, performing a second stamping correction on the reverse side of the workpiece. S5: Workpiece unloading step: The drive motor drives the multi-station mold to rotate 90° again, transferring the mold slot and workpiece to the workpiece unloading station. The one-way flipping clamping mechanism releases the workpiece, and the corrected workpiece slides down the inclined guide plate through the discharge port into the collection container under its own weight. S6: Cyclic execution: The drive motor continues to drive the multi-station mold to rotate in one direction, rotating 90° each time. The four mold slots are rotated to the next station in turn. Steps S1 to S5 are repeated to achieve continuous double-sided stamping and straightening of the workpiece.

[0015] In summary, the present invention has at least one of the following beneficial effects: By cooperating with the peak and valley sections of the annular guide groove and the movable end of the unidirectional flipping clamping mechanism, the rotational motion of the multi-station mold is transformed into a flipping action, realizing a pure mechanical linkage of "rotation equals flipping", eliminating the need for manual flipping or a separate flipping device, and greatly improving operating efficiency. The workpiece automatically flips from face up to back up inside the mold. The first and second stamping stations respectively stamp and straighten the front and back of the workpiece, eliminating the springback problem caused by uneven stress on both sides, and the straightening effect is better. Four mold slots are in different positions at the same time, and each process is carried out in parallel to achieve continuous cyclic production with high production efficiency. The corrected workpieces automatically slide down the inclined guide plate through the drop port into the collection container under their own weight, eliminating the need for manual material handling. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the base of the present invention; Figure 3 This is a partial three-dimensional unfolded cross-sectional view of the multi-station mold of the present invention; Figure 4 This is a partial three-dimensional unfolded cross-sectional view of the unidirectional flipping clamping mechanism of the present invention; Figure 5 This is a partial three-dimensional cross-sectional view of the multi-station mold of the present invention.

[0017] In the diagram: 1. Base; 11. Annular guide groove; 111. Peak-valley section; 12. Material discharge port; 13. Inclined guide plate; 2. Multi-station mold; 21. Mold groove; 211. Workpiece placement station; 212. First stamping station; 213. Second stamping station; 214. Workpiece unloading station; 22. Slide groove; 23. Inclined guide groove; 3. One-way flipping clamping mechanism; 32. Movable plate; 33. Flip-able clamping component; 331. Fixed plate; 332. Clamping plate; 333. Through hole; 334. Semicircular block; 335. One-way bearing; 336. Second guide rod; 337. Rotary ring; 338. Return spring; 339. Spiral groove; 340. Horizontal groove; 34. First guide rod; 4. Drive motor; 5. Top frame; 6. Stamping cylinder; 7. Stamping punch. Detailed Implementation

[0018] The following is in conjunction with the appendixFigures 1-5 The present invention will be described in further detail below.

[0019] Please refer to the attached diagram in the instruction manual. Figures 1-5 An embodiment of the present invention provides a bending aluminum plate stamping straightening die, including a base 1, an annular guide groove 11 is provided on the inner side wall of the base 1, the annular guide groove 11 extends circumferentially along the inner side wall of the base 1, and the annular guide groove 11 has an upward peak-valley section 111. A multi-station mold 2 is rotatably arranged inside the base 1. Four mold slots 21 are evenly opened along the circumferential direction on the multi-station mold 2. A one-way flipping clamping mechanism 3 is movably arranged in each mold slot 21. The one-way flipping clamping mechanism 3 has a movable end. The movable end extends outward along the radial direction of the multi-station mold 2 and is inserted into the annular guide groove 11. The movable end slides in cooperation with the inner wall of the annular guide groove 11.

[0020] A top frame 5 is fixedly connected to the top of the base 1. Two stamping cylinders 6 are fixedly installed on the top frame 5. A stamping punch 7 is fixedly connected to the extended end of each of the two stamping cylinders 6. The four mold slots 21 are, in sequence along the rotation direction of the multi-station mold 2, the workpiece placement station 211, the first stamping station 212, the second stamping station 213, and the workpiece unloading station 214. The positions of the two stamping punches 7 correspond vertically to the positions of the first stamping station 212 and the second stamping station 213, respectively.

[0021] The four mold slots 21 each undertake different process tasks. The workpiece is first placed into the corresponding mold slot 21 at the workpiece placement station 211.

[0022] After the multi-station mold 2 rotates 90°, the mold groove 21 containing the workpiece rotates to the first stamping station 212. The stamping cylinder 6 directly above this station drives the stamping punch 7 to move downward to stamp and straighten the front of the workpiece.

[0023] After the multi-station mold 2 rotates 90° again, the mold slot 21 rotates to the second stamping station 213. The workpiece has been flipped in the previous station, and now the reverse side of the workpiece is facing up. The stamping cylinder 6 directly above the second stamping station 213 drives the stamping punch 7 to move downward to stamp and correct the reverse side of the workpiece.

[0024] After the multi-station mold 2 rotates 90° again, the mold slot 21 rotates to the workpiece unloading station 214, where the corrected workpiece is released and discharged. The four mold slots 21 are in different stations at the same time, realizing continuous production.

[0025] Both ends of the inner wall of the mold groove 21 are provided with sliding grooves 22, and the two sliding grooves 22 extend radially along the mold groove 21 and are arranged opposite to each other. Both sliding grooves 22 have inclined guide grooves 23 at opposite ends. The depth of the bottom of the inclined guide groove 23 gradually changes along the extension direction of the sliding groove 22. The upper end of the inclined guide groove 23 is inclined towards the sliding groove 22, and the lower end of the inclined guide groove 23 is inclined away from the sliding groove 22.

[0026] When the flip-up clamping member 33 moves upward and extends out of the mold groove 21, the second guide rod 336 slides upward along the inclined guide groove 23. The upper end of the inclined guide groove 23 is shallower, pushing the second guide rod 336 to move closer to the fixed plate 331, so as to drive the clamping plate 332 to clamp the workpiece.

[0027] The two slides 22 provide radial sliding guide channels for the two ends of the unidirectional flip clamping mechanism 3, and the two ends of the unidirectional flip clamping mechanism 3 can move back and forth in the radial direction of the mold groove 21 within the slides 22.

[0028] The inclined guide groove 23 is used to control the second guide rod 336 to move in the vertical direction while generating horizontal displacement. The upper end of the inclined guide groove 23 is inclined towards the slide groove 22, that is, the bottom of the upper groove is shallower and closer to the center of the slide groove 22. The lower end of the inclined guide groove 23 is inclined away from the slide groove 22, that is, the bottom of the lower groove is deeper and further away from the center of the slide groove 22.

[0029] When the flip-up clamping member 33 moves upward and extends out of the mold groove 21, the second guide rod 336 slides upward along the inclined guide groove 23. Since the upper end of the inclined guide groove 23 is shallow, the second guide rod 336 is pushed by the inclined surface of the inclined guide groove 23 during the upward sliding process, resulting in a horizontal displacement towards the fixed plate 331. This horizontal displacement pushes the clamping plate 332 to move towards the fixed plate 331, thereby clamping the workpiece with the clamping plate 332.

[0030] The one-way flipping clamping mechanism 3 includes a movable plate 32, which is U-shaped and is slidably disposed in the mold groove 21. Both ends of the movable plate 32 are fixedly connected to flipping clamping parts 33, which are slidably disposed in the slide groove 22. A first guide rod 34 is fixedly connected to the side wall of the movable plate 32. The first guide rod 34 extends outward along the radial direction of the multi-station mold 2. The end of the first guide rod 34 extends out of the multi-station mold 2 and is inserted into the annular guide groove 11. The end of the first guide rod 34 slides in cooperation with the inner wall of the annular guide groove 11. The first guide rod 34 constitutes a movable end.

[0031] When the first guide rod 34 rotates with the multi-station mold 2 and moves to the peak and valley section 111 of the annular guide groove 11, the first guide rod 34 slides upward along the peak and valley section 111, driving the movable plate 32 and the flip-up clamping member 33 to move upward and extend out of the mold groove 21. When the flip-up clamping member 33 extends out of the mold groove 21, it loses the limit of the slide groove 22.

[0032] When the end of the first guide rod 34 slides along the annular guide groove 11 to the peak-valley section 111, the first guide rod 34 is guided by the upward contour of the peak-valley section 111 and moves upward along the annular guide groove 11.

[0033] When the first guide rod 34 moves upward, it drives the movable plate 32 to move upward as well. When the movable plate 32 moves upward, it drives the flip-up clamping parts 33 at both ends to move upward along the slide groove 22. When the flip-up clamping parts 33 move upward within the slide groove 22 and exceed the upper end of the slide groove 22, the flip-up clamping parts 33 extend out of the mold groove 21. At this time, the flip-up clamping parts 33 are freed from the radial limit imposed by the slide groove 22 and gain the freedom of radial movement.

[0034] The flip-up clamping component 33 includes a fixing plate 331 and a clamping plate 332. The fixing plate 331 is slidably disposed in the slide groove 22. A through hole 333 is provided on the side of the fixing plate 331 away from the clamping plate 332. A semi-circular block 334 is fixedly connected to the inner wall of the through hole 333. A one-way bearing 335 is fixedly inserted into the clamping plate 332. A second guide rod 336 is fixedly inserted into the inner ring of the one-way bearing 335. The axis of the second guide rod 336 coincides with the rotation axis of the one-way bearing 335. The second guide rod 336 passes through the through hole 333 and the slide groove 22 and is inserted into the inclined guide groove 23. The end of the second guide rod 336 slides in contact with the inner wall of the inclined guide groove 23.

[0035] After the flip-up clamping member 33 extends out of the mold groove 21 and loses its limit, the second guide rod 336 slides along the inclined guide groove 23. The change in the depth of the bottom of the inclined guide groove 23 pushes the second guide rod 336, causing the second guide rod 336 to push the clamping plate 332 to move closer to the fixed plate 331, so that the clamping plate 332 clamps and fixes the workpiece in the mold groove 21. The clamping plate 332 drives the workpiece to move upward together with the flip-up clamping member 33.

[0036] After the flip-up clamping member 33 extends out of the mold groove 21 and is separated from the limit of the slide groove 22, the end of the second guide rod 336 is still located in the inclined guide groove 23. As the flip-up clamping member 33 continues to move upward, the second guide rod 336 slides from bottom to top along the inclined guide groove 23.

[0037] The upper end of the inclined guide groove 23 is shallow. As the second guide rod 336 slides upward, it is gradually pushed by the inclined surface of the inclined guide groove 23, resulting in a horizontal displacement towards the fixed plate 331. The horizontal displacement of the second guide rod 336 pushes the clamping plate 332 to move closer to the fixed plate 331.

[0038] When the clamping plate 332 moves toward the fixed plate 331, the distance between the clamping plate 332 and the fixed plate 331 decreases. The clamping plate 332 contacts the side of the workpiece in the mold groove 21 and applies clamping force to the workpiece, thereby clamping and fixing the workpiece. After the clamping plate 332 clamps the workpiece, the workpiece moves upward together with the flip-up clamping member 33 and extends out of the mold groove 21.

[0039] A rotating ring 337 is rotatably provided on the side of the clamping plate 332 facing the fixing plate 331. The rotating ring 337 is coaxially arranged with the second guide rod 336. A return spring 338 is fixedly connected to the end face of the rotating ring 337. The end of the return spring 338 away from the rotating ring 337 is fixedly connected to the fixing plate 331. When the second guide rod 336 separates from the inclined guide groove 23, the second guide rod 336 loses the limit of the inclined guide groove 23, and the elastic restoring force of the return spring 338 pushes the clamping plate 332 to move closer to the fixed plate 331 through the rotating ring 337, so that the clamping plate 332 maintains the clamping and fixing state of the workpiece.

[0040] When the flip-up clamp 33 continues to move upward until the end of the second guide rod 336 is completely disengaged from the inclined guide groove 23, the second guide rod 336 is no longer constrained by the inclined guide groove 23.

[0041] At this time, the return spring 338 comes into play. In the previous steps, the return spring 338 underwent elastic deformation due to the clamping plate 332 being pushed towards the fixed plate 331, accumulating elastic potential energy. When the second guide rod 336 disengages from the limit of the inclined guide groove 23, the elastic restoring force of the return spring 338 continues to act on the clamping plate 332 through the rotating ring 337, pushing the clamping plate 332 to maintain pressure towards the fixed plate 331.

[0042] Under the continuous action of the return spring 338, the clamping plate 332 always maintains the clamping and fixing state of the workpiece, and the workpiece will not fall off during the entire process of rising and flipping with the flip-up clamping member 33.

[0043] The second guide rod 336 has a spiral groove 339 on the outer wall of one end facing the inclined guide groove 23, and a transverse groove 340 on the outer wall of the other end facing the clamping plate 332. The transverse groove 340 extends along the axial direction of the second guide rod 336, and the transverse groove 340 and the spiral groove 339 are interconnected. The semicircular block 334 slides in cooperation with the inner wall of the transverse groove 340 and the spiral groove 339.

[0044] When the flip-up clamping member 33 is inside the mold groove 21, the semi-circular block 334 is located in the transverse groove 340, and the flip-up clamping member 33 remains in a non-flipped state. When the flip-up clamping member 33 extends out of the mold groove 21 and loses its limit, the second guide rod 336 moves under the action of the inclined guide groove 23 and the return spring 338, and the semi-circular block 334 slides from the transverse groove 340 into the spiral groove 339. The semi-circular block 334 slides along the spiral contour of the spiral groove 339, driving the second guide rod 336 to rotate around its own axis. The second guide rod 336 drives the clamping plate 332 to rotate together through the one-way bearing 335, and the clamping plate 332 drives the clamped workpiece to complete the flipping. When the first guide rod 34 continues to rotate with the multi-station mold 2 and separates from the peak and valley section 111 of the annular guide groove 11, the movable plate 32 and the fixed plate 331 move downward and retract into the mold groove 21, and the semi-circular block 334 slides back from the spiral groove 339 into the horizontal groove 340. During this process, the workpiece has been flipped by the clamping plate 332 and falls into the mold groove 21 as the movable plate 32 descends. The one-way bearing 335 allows the clamping plate 332 and the workpiece to remain stationary when the second guide rod 336 rotates in the opposite direction.

[0045] When the flip-up clamping member 33 is inside the mold groove 21, the second guide rod 336 is not pushed by the inclined guide groove 23, and the semi-circular block 334 is located in the transverse groove 340. The transverse groove 340 extends axially along the second guide rod 336, and the semi-circular block 334 can slide axially in the transverse groove 340, but will not drive the second guide rod 336 to rotate, and the flip-up clamping member 33 remains in a non-flipped state.

[0046] When the flip-up clamping part 33 extends out of the mold groove 21 and is released from the limit of the slide groove 22, the second guide rod 336 moves axially under the pushing of the inclined guide groove 23 and the action of the return spring 338. As the second guide rod 336 moves axially, the semi-circular block 334 slides from the transverse groove 340 into the spiral groove 339.

[0047] The spiral groove 339 extends spirally along the outer wall of the second guide rod 336. After the semicircular block 334 enters the spiral groove 339, the axial movement of the second guide rod 336 is guided by the contour of the spiral groove 339. The semicircular block 334 slides along the spiral trajectory of the spiral groove 339, generating a circumferential component force, which drives the second guide rod 336 to rotate around its own axis.

[0048] The rotational motion of the second guide rod 336 is transmitted to the clamping plate 332 through the one-way bearing 335. The one-way bearing 335 is locked in the rotational direction, so that the rotational torque of the second guide rod 336 is completely transmitted to the clamping plate 332. The clamping plate 332 rotates together with the second guide rod 336. When the clamping plate 332 rotates, it causes the clamped workpiece to flip together, and the workpiece flips from face up to face down.

[0049] After the workpiece is flipped, the first guide rod 34 continues to rotate with the multi-station mold 2 and separates from the peak and valley section 111 of the annular guide groove 11. The first guide rod 34 slides down along the annular guide groove 11, driving the movable plate 32 and the fixed plate 331 to move down and retract into the mold groove 21. During the retraction process, the semi-circular block 334 slides back from the spiral groove 339 into the transverse groove 340, and the second guide rod 336 is no longer driven by the rotation of the spiral groove 339.

[0050] When the movable plate 32 descends, the workpiece that has been flipped down descends with the movable plate 32 and falls back into the mold groove 21. During this process, the one-way bearing 335 allows the second guide rod 336 to rotate freely in the reverse direction during the return stroke, and will not transmit the reverse rotation to the clamping plate 332. Therefore, the clamping plate 332 and the workpiece maintain their posture unchanged during the process of falling back into the mold groove 21.

[0051] The inner bottom wall of the base 1 is provided with a material discharge port 12. The position of the material discharge port 12 corresponds to the position of the workpiece unloading station 214 in the vertical direction. The bottom of the material discharge port 12 is fixedly connected with an inclined guide plate 13.

[0052] When the one-way flipping clamping mechanism 3 moves to the workpiece unloading station 214, the one-way flipping clamping mechanism 3 releases the workpiece, and the corrected workpiece slides down the inclined guide plate 13 through the discharge port 12 into the collection container.

[0053] When the mold trough 21 containing the corrected workpiece rotates with the multi-station mold 2 to the workpiece ejection station 214, the movable end of the one-way flipping clamping mechanism 3 releases the workpiece under the guidance of the annular guide groove 11, and the clamping force of the one-way flipping clamping mechanism 3 on the workpiece is released.

[0054] After the workpiece is released from its clamping position, it falls downward from the mold groove 21 under its own weight. The inner bottom wall of the base 1 has a discharge port 12 directly below the workpiece ejection station 214. The workpiece falls through the discharge port 12 onto the inclined guide plate 13. The upper surface of the inclined guide plate 13 is an inclined surface. The workpiece slides down the inclined guide plate 13 into the collection container below, completing the ejection and collection.

[0055] A drive motor 4 is fixedly installed at the bottom of the base 1. The rotation axis of the drive motor 4 extends upward into the base 1 and is fixedly connected to the center of the bottom surface of the multi-station mold 2.

[0056] The drive motor 4 is used to drive the multi-station mold 2 to rotate in one direction. Each time the drive motor 4 drives the multi-station mold 2 to rotate 90°, the four mold slots 21 will be rotated to the next station in sequence, so that the workpiece passes through the workpiece placement station 211, the first stamping station 212, the second stamping station 213 and the workpiece unloading station 214 in sequence.

[0057] The drive motor 4 drives the multi-station mold 2 to rotate unidirectionally around its own axis. The rotation angle is fixed at 90° each time. After the multi-station mold 2 completes one 90° rotation, the four mold slots 21 each move forward one station: the mold slot 21 originally in the workpiece placement station 211 moves to the first stamping station 212, the mold slot 21 originally in the first stamping station 212 moves to the second stamping station 213, the mold slot 21 originally in the second stamping station 213 moves to the workpiece unloading station 214, and the mold slot 21 originally in the workpiece unloading station 214 moves to the workpiece placement station 211. The four mold slots 21 are simultaneously in different stations, performing four processes: workpiece placement, front stamping and straightening, back stamping and straightening, and unloading. Each process is carried out in parallel to achieve continuous cyclic production.

[0058] When the multi-station mold 2 rotates, the movable end of the one-way flipping clamping mechanism 3 slides along the annular guide groove 11. When the movable end moves to the peak-valley section 111, the one-way flipping clamping mechanism 3 is lifted upward and extends out of the mold groove 21. The one-way flipping clamping mechanism 3 clamps and fixes the workpiece in the mold groove 21. Then, the one-way flipping clamping mechanism 3 drives the workpiece to flip together to achieve double-sided stamping and straightening of the workpiece.

[0059] In summary: after the drive motor 4 starts, it drives the multi-station mold 2 to rotate. Each mold slot 21 rotates around its axis together with the multi-station mold 2. The movable end of the one-way flipping clamping mechanism 3 slides along the inner wall of the annular guide groove 11.

[0060] When the movable end rotates with the multi-station mold 2 to the peak and valley section 111 of the annular guide groove 11, the movable end is pushed by the upward contour of the peak and valley section 111 and moves upward along the annular guide groove 11. The upward movement of the movable end drives the entire one-way flipping clamping mechanism 3 to be lifted upward, and the upper part of the one-way flipping clamping mechanism 3 gradually extends above the mold groove 21.

[0061] After the one-way flipping clamping mechanism 3 extends out of the mold groove 21, it clamps and fixes the workpiece in the mold groove 21, firmly clamping the workpiece. Then, the one-way flipping clamping mechanism 3 drives the clamped workpiece to flip together, so that the workpiece flips from face up to face down, or from face down to face up. After the workpiece is flipped, it descends together with the one-way flipping clamping mechanism 3 and falls back into the mold groove 21, realizing the double-sided stamping and straightening of the workpiece.

[0062] To better demonstrate a stamping straightening die for bent aluminum sheets, this embodiment proposes a stamping straightening method for bent aluminum sheets, including the following steps: S1: Workpiece placement step: Place the bent aluminum plate workpiece to be corrected into the mold groove 21 at the workpiece placement station 211. Drive the multi-station mold 2 to rotate 90° and transfer the mold groove 21 and the workpiece to the first stamping station 212. S2: Front stamping correction step: The stamping cylinder 6 above the first stamping station 212 drives the stamping punch 7 to move downward, and performs the first stamping correction on the front of the workpiece. The drive motor 4 drives the multi-station mold 2 to rotate 90° again, and transfers the mold slot 21 and the workpiece to the next station. S3: Workpiece flipping step: During the transfer process, the movable end of the one-way flipping clamping mechanism 3 slides along the annular guide groove 11 to the peak-valley section 111. The movable end is lifted upward by the peak-valley section 111, which drives the one-way flipping clamping mechanism 3 to extend out of the mold groove 21. The one-way flipping clamping mechanism 3 clamps and fixes the workpiece. Then, the one-way flipping clamping mechanism 3 drives the workpiece to flip together, so that the reverse side of the workpiece faces upward. After the flipping is completed, the one-way flipping clamping mechanism 3 drives the workpiece to fall back into the mold groove 21 and releases the clamp. S4: Reverse stamping correction step: Drive motor 4 drives multi-station mold 2 to rotate 90° again, transferring the mold slot 21 and workpiece to the second stamping station 213. The stamping cylinder 6 above the second stamping station 213 drives the stamping punch 7 to move downward, performing a second stamping correction on the reverse side of the workpiece. S5: Workpiece unloading step: Drive motor 4 drives multi-station mold 2 to rotate 90° again, and transfers the mold slot 21 and workpiece to workpiece unloading station 214. One-way flipping clamping mechanism 3 releases the workpiece. The corrected workpiece slides down through the drop port 12 along the inclined guide plate 13 into the collection container under its own weight. S6: Cyclic execution: Drive motor 4 continues to drive multi-station mold 2 to rotate in one direction, rotating 90° each time. The four mold slots 21 are rotated to the next station in turn. Repeat steps S1 to S5 to achieve continuous double-sided stamping and straightening of the workpiece.

[0063] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A bending aluminum sheet stamping straightening die, comprising a base (1), characterized in that: The inner wall of the base (1) is provided with an annular guide groove (11), which extends circumferentially along the inner wall of the base (1) and has an upward peak-valley section (111). The base (1) is rotatably provided with a multi-station mold (2). The multi-station mold (2) is provided with four mold slots (21) evenly distributed along the circumference. Each mold slot (21) is provided with a unidirectional flip clamping mechanism (3). The unidirectional flip clamping mechanism (3) has a movable end. The movable end extends outward along the radial direction of the multi-station mold (2) and is inserted into the annular guide groove (11). The movable end slides in cooperation with the inner wall of the annular guide groove (11). A drive motor (4) is fixedly installed at the bottom of the base (1). The rotation axis of the drive motor (4) extends upward into the base (1) and is fixedly connected to the center of the bottom surface of the multi-station mold (2).

2. The bending aluminum plate stamping straightening die according to claim 1, characterized in that: The top of the base (1) is fixedly connected to a top frame (5), and two stamping cylinders (6) are fixedly installed on the top frame (5). The protruding ends of the two stamping cylinders (6) are fixedly connected to stamping punches (7). The four mold slots (21) are, in sequence, along the rotation direction of the multi-station mold (2), the workpiece placement station (211), the first stamping station (212), the second stamping station (213), and the workpiece unloading station (214). The positions of the two stamping punches (7) correspond vertically to the positions of the first stamping station (212) and the second stamping station (213).

3. The bending aluminum plate stamping straightening die according to claim 2, characterized in that: Both ends of the inner wall of the mold groove (21) are provided with sliding grooves (22), and the two sliding grooves (22) extend radially along the mold groove (21) and are arranged opposite to each other. Both of the two sliding grooves (22) have inclined guide grooves (23) at opposite ends. The bottom depth of the inclined guide groove (23) gradually changes along the extension direction of the sliding groove (22), and the upper end of the inclined guide groove (23) is inclined towards the sliding groove (22), while the lower end of the inclined guide groove (23) is inclined away from the sliding groove (22).

4. The bending aluminum plate stamping straightening die according to claim 3, characterized in that: The one-way flip clamping mechanism (3) includes a movable plate (32), which is U-shaped and is slidably disposed in the mold groove (21). Both ends of the movable plate (32) are fixedly connected to a flip clamping member (33), which is slidably disposed in the slide groove (22). The side wall of the movable plate (32) is fixedly connected to a first guide rod (34). The first guide rod (34) extends outward along the radial direction of the multi-station mold (2). The end of the first guide rod (34) extends out of the multi-station mold (2) and is inserted into the annular guide groove (11). The end of the first guide rod (34) slides in cooperation with the inner wall of the annular guide groove (11). The first guide rod (34) constitutes a movable end.

5. The bending aluminum plate stamping straightening die according to claim 4, characterized in that: The flip-up clamping member (33) includes a fixing plate (331) and a clamping plate (332). The fixing plate (331) is slidably disposed in the slide groove (22). A through hole (333) is provided on the side of the fixing plate (331) away from the clamping plate (332). A semi-circular block (334) is fixedly connected to the inner wall of the through hole (333). A one-way bearing (335) is fixedly inserted into the clamp plate (332). A second guide rod (336) is fixedly inserted into the inner ring of the one-way bearing (335). The axis of the second guide rod (336) coincides with the rotation axis of the one-way bearing (335). The second guide rod (336) passes through the through hole (333) and the slide groove (22) and is inserted into the inclined guide groove (23). The end of the second guide rod (336) slides in cooperation with the inner wall of the inclined guide groove (23).

6. The bending aluminum plate stamping straightening die according to claim 5, characterized in that: The clamping plate (332) is rotatably provided with a rotating ring (337) on the side facing the fixing plate (331). The rotating ring (337) is coaxially arranged with the second guide rod (336). A return spring (338) is fixedly connected to the end face of the rotating ring (337). The end of the return spring (338) away from the rotating ring (337) is fixedly connected to the fixing plate (331). When the second guide rod (336) separates from the inclined guide groove (23), the second guide rod (336) loses the limit of the inclined guide groove (23), and the elastic restoring force of the return spring (338) pushes the clamping plate (332) to move closer to the fixed plate (331) through the rotating ring (337) so that the clamping plate (332) maintains the clamping and fixing state of the workpiece.

7. The bending aluminum plate stamping straightening die according to claim 6, characterized in that: The second guide rod (336) has a spiral groove (339) on the outer wall of one end facing the inclined guide groove (23), and a horizontal groove (340) on the outer wall of the other end facing the clamp (332). The horizontal groove (340) extends along the axial direction of the second guide rod (336), and the horizontal groove (340) and the spiral groove (339) are interconnected. The semicircular block (334) slides in cooperation with the inner wall of the horizontal groove (340) and the spiral groove (339).

8. The bending aluminum plate stamping straightening die according to claim 2, characterized in that: The base (1) has a material drop port (12) on its inner bottom wall. The position of the material drop port (12) corresponds to the position of the workpiece unloading station (214) in the vertical direction. The bottom of the material drop port (12) is fixedly connected to an inclined guide plate (13).

9. The bending aluminum plate stamping straightening die according to claim 2, characterized in that: The drive motor (4) is used to drive the multi-station mold (2) to rotate in one direction. The drive motor (4) drives the multi-station mold (2) to rotate 90° each time, and the four mold slots (21) are sequentially rotated to the next station, so that the workpiece passes through the workpiece placement station (211), the first stamping station (212), the second stamping station (213) and the workpiece unloading station (214) in sequence.

10. A method for stamping and straightening bent aluminum plates, using the stamping and straightening die for bent aluminum plates as described in any one of claims 1-9, characterized in that, It also includes the following steps: S1: Workpiece placement step: Place the bent aluminum plate workpiece to be corrected in the mold groove (21) at the workpiece placement station (211), drive the multi-station mold (2) to rotate 90°, and transfer the mold groove (21) and the workpiece to the first stamping station (212). S2: Front stamping correction steps: The stamping cylinder (6) above the first stamping station (212) drives the stamping punch (7) to move downward, and performs the first stamping correction on the front of the workpiece. The drive motor (4) drives the multi-station mold (2) to rotate 90° again, and transfers the mold slot (21) and the workpiece to the next station. S3: Workpiece flipping step: During the transfer process, the movable end of the one-way flipping clamping mechanism (3) slides along the annular guide groove (11) to the peak and valley section (111). The movable end is lifted upward by the peak and valley section (111), which drives the one-way flipping clamping mechanism (3) to extend out of the mold groove (21). The one-way flipping clamping mechanism (3) clamps and fixes the workpiece. Then, the one-way flipping clamping mechanism (3) drives the workpiece to flip together, so that the reverse side of the workpiece faces upward. After the flipping is completed, the one-way flipping clamping mechanism (3) drives the workpiece to fall back into the mold groove (21) and releases the clamp. S4: Reverse stamping correction steps: The drive motor (4) drives the multi-station mold (2) to rotate 90° again, and transfers the mold slot (21) and the workpiece to the second stamping station (213). The stamping cylinder (6) above the second stamping station (213) drives the stamping punch (7) to move downward, and performs a second stamping correction on the reverse side of the workpiece. S5: Workpiece unloading step: Drive motor (4) drives multi-station mold (2) to rotate 90° again, and transfer the mold slot (21) and workpiece to workpiece unloading station (214). One-way flipping clamping mechanism (3) releases workpiece. Under its own weight, the corrected workpiece slides down through the drop port (12) along the inclined guide plate (13) into the collection container. S6: Cyclic execution: The drive motor (4) continues to drive the multi-station mold (2) to rotate in one direction, rotating 90° each time. The four mold slots (21) are rotated to the next station in turn. Steps S1 to S5 are repeated to realize continuous double-sided stamping and straightening of the workpiece.

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