A lifting mechanism for preventing deformation of an automobile part in stamping and a stamping die

Abstract

The present application relates to the technical field of automobile sheet metal stamping, in particular to a lifting mechanism for preventing deformation of automobile parts during stamping and a stamping die, which comprises a rectangular frame, an upper die holder, a lower die holder, a lifting and unloading mechanism and a pressing assembly. A plurality of positioning columns are arranged on the upper die holder, and a plurality of positioning holes are arranged on the lower die holder and matched with the positioning columns. The lifting and unloading mechanism comprises a main shaft and two lifting and overturning structures. The middle part of the main shaft is connected with the lower die holder, and the two ends of the main shaft are connected with the rectangular frame through bearing seats. The two lifting and overturning structures are arranged at the two ends of the main shaft respectively, and are used for converting the lifting movement of the upper die holder into the rotating movement of the main shaft. The pressing assembly comprises a plurality of magnetic cover plates, which are the same as the upper die. When the upper die holder and the lower die holder are separated, the magnetic cover plates are adsorbed on the lower die holder. The lifting and unloading mechanism and the pressing assembly are arranged, so that the deformation problem of the stamping part caused by uneven stress when the stamping part is separated from the lower die is solved.

Description

Technical Field

[0001] This invention relates to the field of automotive sheet metal stamping technology, specifically to a lifting mechanism for preventing deformation of stamped automotive parts, and also to a stamping die. Background Technology

[0002] In the automotive parts manufacturing industry, stamping is one of the core processes for rapid processing of sheet metal, widely used in the production of key components such as body panels and structural parts. However, with the continuous improvement of the automotive industry's requirements for the precision and quality of parts, the problems exposed in the unloading process of traditional stamping mechanisms have become increasingly prominent, becoming an important factor restricting the improvement of product quality. After completing the stamping, traditional stamping mechanisms usually rely on manual labor or simple robotic arms to directly remove the stamped parts from the lower die. For automotive parts with large areas and complex structures (such as door inner panels, engine hood outer panels, etc.), due to the certain adhesion force between the stamped parts and the lower die after forming, uneven force can easily cause local deformation during the unloading process.

[0003] Patent CN117444064B discloses a stamping die for automotive sheet metal parts that facilitates unloading. It uses a buffer to cushion the force of the electric push rod, making the lifting process of the sheet metal part more gradual and extending the time for it to separate from the lower die. This avoids damage to the sheet metal part caused by rapid lifting to a certain extent. At the same time, by controlling the extension and retraction length of the two sets of electric push rods, the tilt angle of the die side plate can be adjusted to achieve tilted unloading of the sheet metal part.

[0004] Although the above solution uses a buffer to slowly separate the sheet metal part from the lower mold and prevent deformation, during the lifting process, the sheet metal part is only stressed at the contact area with the buffer, and the other areas are not effectively supported. This makes it prone to deformation due to localized stress concentration. In the sliding unloading stage, the sheet metal part is only supported by the mold side plates on both sides, and the middle is suspended. For larger sheet metal parts, when the distance between the two mold side plates is large, the middle area is prone to downward deformation due to its own weight. This solution cannot fundamentally solve the problem of unloading deformation of large-area stamped parts. Summary of the Invention

[0005] To address the aforementioned problems, a lifting mechanism for preventing deformation of stamped automotive parts is provided. By incorporating a lifting and unloading mechanism and a clamping assembly, the deformation problem caused by uneven force when the stamped parts separate from the lower die is solved.

[0006] To address the problems of existing technologies, this invention provides a lifting mechanism for preventing deformation of stamped automotive parts, comprising a rectangular frame, an upper die base for mounting an upper mold, a lower die base for mounting a lower mold, a lifting and unloading mechanism, and a clamping assembly. The upper and lower die bases are arranged vertically within the rectangular frame. The upper die base has multiple positioning pins, and a stamping driver is located at its upper end. The lower die base has positioning holes that mate with the positioning pins. The lifting and unloading mechanism includes a main shaft and two lifting and tilting structures. The middle of the main shaft is connected to the lower die base, and both ends of the main shaft are connected to the rectangular frame via bearing seats. The two lifting and tilting structures are respectively located at both ends of the main shaft. The lifting and tilting structures are used to convert the lifting motion of the upper die base into the rotational motion of the main shaft. The clamping assembly includes multiple magnetic cover plates. The shape of the middle part of the magnetic cover plate is the same as that of the upper mold. When the upper and lower die bases are separated, the magnetic cover plates are attracted to the lower die base.

[0007] Preferably, the lifting and tilting structure includes a rotating component, a lifting component, and a transmission component; the rotating component includes an internal gear ring coaxial with and fixedly connected to the main shaft and a first gear meshing with the internal gear ring; the lifting component is connected to the upper mold base; the transmission component is used to convert the lifting motion of the lifting component into the rotational motion of the first gear.

[0008] Preferably, the transmission assembly includes a rotating shaft, a second gear, and a rack; the rotating shaft is connected to a rectangular frame via a bearing housing, and one end of the rotating shaft is connected to the first gear; the second gear is connected to the other end of the rotating shaft; the rack meshes with the second gear and is connected to the lifting assembly, the upper half of the rack is a smooth part, and the lower half of the rack is a toothed part.

[0009] Preferably, the lifting assembly includes multiple guide rods and a movable block; the multiple guide rods are all vertically arranged, and the two ends of the guide rods are respectively connected to the upper and lower ends of the rectangular frame; the movable block is slidably connected to the multiple guide rods, the upper end of the movable block is connected to the upper mold base, and the rack is installed on the side of the movable block.

[0010] Preferably, the lifting and unloading mechanism further includes a movable connecting structure and two lifting structures; the movable connecting structure is used to movably connect the main shaft and the lower mold base; the two lifting structures are respectively arranged on both sides of the lower mold base, and the lifting structures are used to separate the main shaft and the lower mold base.

[0011] Preferably, the movable connection structure includes a connecting plate and at least two guide connection components; the connecting plate is fixedly connected to the main shaft; the two guide connection components are symmetrically arranged about the middle surface of the connecting plate, and the two ends of the guide connection components are respectively connected to the connecting plate and the lower mold base to keep the lower surface of the connecting plate parallel to the lower mold base.

[0012] Preferably, the lifting structure includes a mounting frame, multiple lifting rods, and a linear actuator; the mounting frame is horizontally arranged and has multiple support holes facing the center of the rectangular frame; the multiple lifting rods are slidably arranged in the multiple support holes; the linear actuator is used to drive the multiple lifting rods to move synchronously along the axial direction of the support holes.

[0013] Preferably, the magnetic cover plate is provided with multiple positioning and docking components around its perimeter. The positioning and docking components include docking posts, which correspond to the positioning holes on the lower mold base.

[0014] Preferably, the clamping assembly further includes multiple magnetic attraction control components, which are respectively disposed in multiple positioning holes. The magnetic attraction control components are used to provide an attraction force to the magnetic cover plate toward the lower mold base.

[0015] A stamping die includes a lifting mechanism to prevent deformation of stamped automotive parts.

[0016] The advantages of this invention compared to the prior art are:

[0017] 1. This invention includes a lifting and unloading mechanism and a clamping assembly. The magnetic cover plate in the clamping assembly matches the shape of the upper mold and can tightly fit the surface of the stamped part. At the same time, it is magnetically attracted to the lower mold base to fix the stamped part, providing a stable foundation for subsequent flipping and unloading, and preventing the stamped part from loosening or shifting before flipping. The upward movement of the upper mold base is converted into the rotational movement of the main shaft through two lifting and flipping structures in the lifting and unloading mechanism. The lifting and flipping structures at both ends work together to ensure that the main shaft and the lower mold base rotate synchronously. After flipping, the magnetic cover plate is located at the lower end of the lower mold base to support the stamped part. When separating, the magnetic cover plate provides uniform support for the entire stamped part, thereby solving the problem of deformation caused by uneven force when the stamped part separates from the lower mold.

[0018] 2. This invention includes a rotating component, a lifting component, and a transmission component. The lifting component is connected to the upper mold base and can transmit the lifting and lowering motion of the upper mold base to the transmission component and the rotating component, realizing the conversion of linear motion to rotational motion. When the upper mold base rises, it drives the first gear to rotate in the forward direction, which drives the main shaft to rotate in the forward direction through the internal gear ring. When the upper mold base falls, it drives the first gear to rotate in the reverse direction, realizing the reverse rotation of the main shaft, thereby realizing the linkage between the movement of the upper mold base and the rotational movement of the main shaft.

[0019] 3. This invention is equipped with a rotating shaft, a second gear, and a rack. The smooth part of the rack prevents the transmission components from being driven when the upper mold base initially rises, and keeps the lower mold base horizontal to ensure smooth separation of the positioning pin. The meshing transmission between the rack teeth and the second gear can stably convert the lifting motion of the upper mold base into the rotational power of the main shaft. Forward rotation realizes the flipping of the lower mold base, and reverse rotation completes the reset. Through the segmented design of the smooth part and the teeth of the rack, the control of the state of the lower mold base at different stages of the upper mold base movement is realized. Attached Figure Description

[0020] Figure 1 This invention relates to a lifting mechanism for preventing deformation of stamped automotive parts and a three-dimensional stamping die. Figure 1 .

[0021] Figure 2 This invention relates to a lifting mechanism for preventing deformation of stamped automotive parts and a three-dimensional stamping die. Figure 2 .

[0022] Figure 3 This is a perspective view of the rectangular frame, main shaft, lifting and tilting structure, and movable connection structure in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0023] Figure 4 This is a perspective view of the rotating component, lifting component, and transmission component in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0024] Figure 5 This is a perspective view of the rotating component and the transmission component in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0025] Figure 6 This is a perspective view of the lifting component and transmission component in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0026] Figure 7 This is a perspective view of the lower mold base, main shaft, movable connection structure, and lifting structure in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0027] Figure 8 This is a perspective view of the lower mold base, main shaft, connecting plate, and guide connection assembly in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0028] Figure 9 This is a perspective sectional view of the lower die base, mounting bracket, lifting rod, and linear actuator in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0029] Figure 10 This is a perspective view of the lower mold base, magnetic cover plate, and positioning docking assembly in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0030] Figure 11 This is a three-dimensional sectional view of the lower mold base, magnetic cover plate, positioning and docking assembly, and magnetic control assembly in a lifting mechanism for preventing deformation of stamped automotive parts according to the present invention.

[0031] The diagram is labeled as follows: 1. Rectangular frame; 2. Upper die base; 21. Positioning pin; 3. Lower die base; 31. Positioning hole; 32. Docking hole; 4. Stamping driver; 5. Lifting and unloading mechanism; 51. Main shaft; 52. Lifting and tilting structure; 521. Rotating assembly; 5211. Internal gear ring; 5212. First gear; 522. Lifting assembly; 5221. Guide rod; 5222. Moving block; 523. Transmission assembly; 5231. Rotating shaft; 5232. Second gear. 5233, Rack; 53, Movable connection structure; 531, Connecting plate; 532, Guide connection assembly; 5321, Connecting bolt; 5322, Spring; 54, Lifting structure; 541, Mounting bracket; 5411, Support hole; 542, Lifting rod; 543, Linear actuator; 6, Clamping assembly; 61, Magnetic cover plate; 62, Positioning docking assembly; 621, Docking post; 622, Permanent magnet; 63, Magnetic control assembly; 631, Electromagnetic ring. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 11 As shown: A lifting mechanism for preventing deformation of stamped automotive parts includes a rectangular frame 1, an upper die base 2 for mounting an upper die, a lower die base 3 for mounting a lower die, a lifting and unloading mechanism 5, and a clamping assembly 6. The upper die base 2 and the lower die base 3 are arranged vertically within the rectangular frame 1. The upper die base 2 is provided with multiple positioning pins 21, and a stamping driver 4 is provided at the upper end of the upper die base 2. The lower die base 3 has positioning holes 31 that mate with the positioning pins 21. The lifting and unloading mechanism 5 includes a main shaft 51 and two lifting tilting mechanisms. The rotating structure 52 connects the middle of the main shaft 51 to the lower mold base 3. Both ends of the main shaft 51 are connected to the rectangular frame 1 through bearing seats. Two lifting and flipping structures 52 are respectively set at both ends of the main shaft 51. The lifting and flipping structures 52 are used to convert the lifting motion of the upper mold base 2 into the rotational motion of the main shaft 51. The clamping assembly 6 includes multiple magnetic cover plates 61. The shape of the middle part of the magnetic cover plate 61 is the same as the shape of the upper mold. When the upper mold base 2 and the lower mold base 3 are separated, the magnetic cover plate 61 is attracted to the lower mold base 3.

[0034] First, the steel plate to be stamped is placed on the lower die of the lower die base 3. The stamping driver 4 is then activated, driving the upper die base 2, carrying the upper die, to move rapidly toward the lower die base 3. During this movement, the positioning pin 21 of the upper die base 2 is inserted into the positioning hole 31 of the lower die base 3, ensuring alignment of the upper and lower dies. When the upper die base 2 contacts the lower die base 3, the steel plate is stamped under the action of the closing action of the upper and lower dies, forming the required stamped part. After stamping, the stamping driver 4 first drives the upper die base 2 to move upward a certain distance, creating a gap between the upper die base 2 and the lower die base 3 that can accommodate the magnetic cover plate 61. Then, the magnetic cover plate 61, which has the same shape as the upper die, is placed on the lower die base 3. Because the magnetic cover plate 61 matches the shape of the upper die, it can fit tightly against the upper surface of the stamped part. At the same time, the magnetic cover plate 61 is magnetically attracted to the lower die base 3, thus facilitating the stamping process. The part is firmly fixed on the lower die of the lower die base 3. The stamping driver 4 drives the upper die base 2 to move upward again. At this time, the upward movement of the upper die base 2 is converted into the rotational movement of the main shaft 51 through the lifting and flipping structure 52 at both ends. The two lifting and flipping structures 52 ensure that the two ends of the main shaft 51 rotate synchronously, thereby driving the lower die base 3 connected to the middle of the main shaft 51 to rotate synchronously. After the lower die base 3 rotates 180 degrees, the magnetic cover plate 61 that originally covered the lower die base 3 changes to the lower end of the lower die base 3. The stamped part covered by the magnetic cover plate 61 falls onto the magnetic cover plate 61 due to gravity. Finally, the magnetic cover plate 61 is separated from the lower die base 3, and the stamped part follows the magnetic cover plate 61 to separate from the lower die. The magnetic cover plate 61, which is consistent with the shape of the upper die, provides uniform support for the stamped part during the unloading process, thereby solving the problem of deformation caused by uneven force when the stamped part separates from the lower die.

[0035] Reference Figure 2 , Figure 3 and Figure 4 As shown: The lifting and flipping structure 52 includes a rotating component 521, a lifting component 522, and a transmission component 523; the rotating component 521 includes an internal gear ring 5211 coaxial with and fixedly connected to the main shaft 51 and a first gear 5212 meshing with the internal gear ring 5211; the lifting component 522 is connected to the upper mold base 2; the transmission component 523 is used to convert the lifting motion of the lifting component 522 into the rotational motion of the first gear 5212.

[0036] After the stamping process is completed, the stamping driver 4 drives the upper die holder 2 to move upward. The lifting component 522 connected to the upper die holder 2 moves upward in a linear motion in sync. At this time, the upward motion of the lifting component 522 is transmitted to the first gear 5212 through the transmission component 523, driving the first gear 5212 to rotate in the forward direction. The rotational force of the first gear 5212 is transmitted to the internal gear ring 5211 through the meshing action of the teeth, causing the internal gear ring 5211 to rotate in the forward direction in sync. The forward rotation of the internal gear ring 5211 directly drives the main shaft 51 to rotate in sync, providing power for the main shaft 51 to drive the lower die holder 3 to rotate. When the next stamping is performed, the stamping driver 4 drives the upper die holder 2 to move downward, and the lifting component 522 moves downward in a linear motion in sync with the upper die holder 2. The downward movement of the lifting component 522 acts on the first gear 5212 through the transmission component 523, causing the first gear 5212 to rotate in the opposite direction. The reverse rotation of the first gear 5212, through its meshing relationship with the internal gear ring 5211, drives the internal gear ring 5211 to rotate in the opposite direction, thereby driving the main shaft 51 to rotate in the opposite direction along with the internal gear ring 5211. When the main shaft 51 rotates 180 degrees in the opposite direction, the lifting component 522 stops driving the first gear 5212 to rotate through the transmission component 523, and the main shaft 51 completes the reset action. By connecting the lifting component 522 to the upper mold base 2, the lifting and lowering action of the upper mold base 2 can be transmitted to the transmission component 523 and the rotating component 521 in real time, thereby realizing the linkage between the movement of the upper mold base 2 and the rotational movement of the main shaft 51.

[0037] Reference Figure 4 and Figure 5 As shown: The transmission assembly 523 includes a rotating shaft 5231, a second gear 5232, and a rack 5233; the rotating shaft 5231 is connected to the rectangular frame 1 through a bearing seat, and one end of the rotating shaft 5231 is connected to the first gear 5212; the second gear 5232 is connected to the other end of the rotating shaft 5231; the rack 5233 meshes with the second gear 5232 and is connected to the lifting assembly 522, and the upper half of the rack 5233 is a smooth part, and the lower half of the rack 5233 is a toothed part.

[0038] After stamping, the upper die holder 2 enters the initial stage of separation from the lower die holder 3. At this time, the positioning pin 21 of the upper die holder 2 needs to separate from the positioning hole 31 of the lower die holder 3 first. The lower die holder 3 needs to remain horizontal. The upper die holder 2 moves upward under the drive of the stamping driver 4, driving the lifting assembly 522 and the rack 5233 to rise synchronously. Since the smooth part of the rack 5233 is in contact with the second gear 5232 at this stage, the two are not meshed, and the upward movement of the rack 5233 will not drive the second gear 5232 to rotate. The rotating shaft 5231 and the first gear 52 12 also remains stationary, the main shaft 51 does not rotate, and the lower mold base 3 remains stable and horizontal, ensuring that the positioning pin 21 smoothly disengages from the positioning hole 31. After the magnetic cover plate 61 is attracted to the lower mold base 3, the upper mold base 2 moves upward again, and the rack 5233 moves upward to the position where the teeth mesh with the second gear 5232. At this time, the upward movement of the rack 5233 drives the second gear 5232 to rotate in the forward direction through the meshing of the teeth with the teeth of the second gear 5232. The rotation of the second gear 5232 is transmitted to the first gear 5 at the other end through the rotating shaft 5231. 212, causing the first gear 5212 to rotate synchronously in the forward direction, thereby driving the internal gear ring 5211 meshing with it to rotate, realizing the rotation of the main shaft 51. When stamping again, the upper die holder 2 moves downward first. At this time, the rack 5233 moves downward synchronously with the lifting assembly 522. The teeth of the rack 5233 are meshed with the second gear 5232. The downward movement of the rack 5233 drives the second gear 5232 to rotate in the opposite direction. Through the rotating shaft 5231, it drives the first gear 5212 to rotate in the opposite direction, thereby causing the internal gear ring 5211 and the main shaft 51 to rotate in the opposite direction, realizing the rotation of the main shaft 51. Now the mold base 3 is reset. After the mold base 3 is fully reset, the rack 5233 continues to move down, the teeth separate from the second gear 5232, and the smooth part contacts the second gear 5232 again. After that, the movement of the rack 5233 no longer drives the second gear 5232 to rotate. The rotating shaft 5231 and the first gear 5212 remain stationary, and the main shaft 51 remains stable, ensuring that the upper mold base 2 can accurately move down to perform stamping operations. Through the segmented design of the smooth part and the teeth of the rack 5233, the control of the state of the lower mold base 3 at different movement stages of the upper mold base 2 is realized.

[0039] Reference Figure 4 and Figure 6 As shown: The lifting assembly 522 includes multiple guide rods 5221 and a moving block 5222; the multiple guide rods 5221 are all vertically arranged, and the two ends of the guide rods 5221 are respectively connected to the upper and lower ends of the rectangular frame 1; the moving block 5222 is slidably connected to the multiple guide rods 5221, the upper end of the moving block 5222 is connected to the upper mold base 2, and the rack 5233 is installed on the side of the moving block 5222.

[0040] Driven by the stamping driver 4, the upper die holder 2 moves upward. The moving block 5222 slides upward synchronously along the vertical guide rod 5221. Multiple guide rods 5221 provide vertical guidance for the moving block 5222, ensuring that it rises without deviation or wobbling, thus driving the upper die holder 2 to rise smoothly. At this time, the rack 5233 mounted on the side of the moving block 5222 rises synchronously with it. Before the next stamping, the upper die holder 2 moves downward, and the moving block 5222 slides downward synchronously along the guide rod 5221. The guide rod 5221 ensures that the moving block 5222 drives the rack 5233 to move vertically downward, maintaining stable meshing between the teeth of the rack 5233 and the second gear 5232. This transmits the downward power to the transmission assembly 523, driving the second gear 5232 to rotate in the opposite direction. The lower die holder 3 is reset. After the lower die holder 3 is fully reset, the moving block 5222 continues to move downward. The teeth of the rack 5233 separate from the second gear 5232, and the smooth part contacts the second gear 5232. At this time, the guide rod 5221 still provides stable guidance for the moving block 5222, ensuring that the smooth part of the rack 5233 is aligned with the second gear 5232, cutting off the power transmission, keeping the main shaft 51 stationary, and providing stable support for the precise downward stamping of the upper die holder 2. Multiple vertical guide rods 5221 provide rigid guiding constraints for the moving block 5222, ensuring that the moving block 5222 and the rack 5233 always move smoothly in the vertical direction, thereby avoiding the offset or shaking of the rack 5233 during the lifting and lowering process, and providing a basic guarantee for the meshing and separation of the rack 5233 and the second gear 5232.

[0041] Reference Figure 2 and Figure 7 As shown: The lifting and unloading mechanism 5 also includes a movable connecting structure 53 and two lifting structures 54; the movable connecting structure 53 is used to movably connect the main shaft 51 and the lower mold base 3; the two lifting structures 54 are respectively arranged on both sides of the lower mold base 3, and the lifting structures are used to separate the main shaft 51 and the lower mold base 3.

[0042] When the stamping driver 4 drives the upper die holder 2 to stamp, the lower die holder 3 will be subjected to a huge downward force, which will be transmitted to the main shaft 51. If the main shaft 51 is subjected to excessive force, it may bend. Therefore, a movable connection structure 53 and two lifting structures 54 are set. The movable connection structure 53 can keep the lower die holder 3 and the main shaft 51 rotating synchronously around the axis of the main shaft 51. When the lower die holder 3 is in a horizontal state, the two lifting structures 54 push upward from both sides of the lower die holder 3, applying an upward supporting force to the lower die holder 3, so that the lower die holder 3 and the main shaft 51 are separated through the movable connection structure 53. Therefore, the downward impact force on the lower die holder 3 is no longer transmitted to the main shaft 51, but is distributed to the rectangular frame 1 through the lifting structures 54 on both sides, avoiding the main shaft 51 from bearing excessive load, thereby solving the problem of the main shaft 51 bending due to excessive force.

[0043] Reference Figure 7 and Figure 8 As shown: The movable connection structure 53 includes a connecting plate 531 and at least two guide connection components 532; the connecting plate 531 is fixedly connected to the main shaft 51; the two guide connection components 532 are symmetrically arranged about the middle surface of the connecting plate 531, and the two ends of the guide connection components 532 are respectively connected to the connecting plate 531 and the lower mold base 3 to keep the lower surface of the connecting plate 531 parallel to the lower surface of the lower mold base 3.

[0044] Specifically, the guide connection assembly 532 includes multiple connecting bolts 5321. One end of the connecting bolt 5321 passes through the connecting plate 531 and is fixedly connected to the lower mold base 3. The connecting plate 531 and the connecting bolt 5321 are slidably connected. A spring 5322 is sleeved on the connecting bolt 5321. The two ends of the spring 5322 abut against the ends of the connecting plate 531 and the connecting bolt 5321, respectively.

[0045] Before the stamping operation, the lower die holder 3 moves upward against the compression preload of the spring 5322 under the action of the lifting structure 54. The connecting bolt 5321 fixed to the lower die holder 3 moves upward synchronously, and the connecting plate 531 slides relative to the connecting bolt 5321. The lower die holder 3 separates from the connecting plate 531, and the spring 5322 is further compressed to store elastic potential energy. The force support point of the lower die holder 3 is transferred to the lifting structure 54. After the stamping is completed, the flipping and unloading stage begins. The lifting structure 54 retracts its support force, and the compressed spring 5322 releases its elastic force. The connecting bolt 5321 pushes the lower die holder 3 downward, so that the lower die holder 3 and the connecting plate 531 re-abut against each other. When the main shaft 51 rotates under the drive of the lifting and flipping structure 52, the connecting plate 531 drives the lower die holder 3 to rotate synchronously around the axis of the main shaft 51. This achieves separation before stamping to isolate the load, and close fit and synchronous rotation during flipping, meeting the differentiated requirements of different processes for the connection relationship between the connecting plate 531 and the lower die holder 3.

[0046] Reference Figure 7 and Figure 9 As shown: The lifting structure 54 includes a mounting frame 541, multiple lifting rods 542, and a linear actuator 543; the mounting frame 541 is horizontally arranged, and multiple support holes 5411 facing the middle of the rectangular frame 1 are opened on the mounting frame 541; the multiple lifting rods 542 are slidably arranged in the multiple support holes 5411 respectively, and multiple docking holes 32 that mate with the lifting rods 542 are opened on the side wall of the lower mold base 3; the linear actuator 543 is used to drive the multiple lifting rods 542 to move synchronously along the axial direction of the support holes 5411.

[0047] Currently, the die holder 3 is in a horizontal position, just before the stamping operation. At this time, the axis of the support hole 5411 on the mounting bracket 541 is slightly higher than the axis of the mating hole 32 on the side wall of the lower die holder 3. The lifting structure 54 is activated, and the linear actuator 543 is started, driving multiple lifting rods 542 to move synchronously towards the lower die holder 3 along the axis of the support hole 5411. Before the lifting rods 542 enter the mating hole 32, the ends of the lifting rods 542 first mate with the opening of the mating hole 32 of the lower die holder 3. Then, the lateral movement of the lifting rods 542 will apply an upward force to the lower die holder 3. Under this force, the lifting rod 542 moves upward against the compression preload of the spring 5322 in the movable connection structure 53. When the lifting rod 542 is fully inserted into the docking hole 32, the lifting rod 542 and the docking hole 32 are tightly fitted together, and the position of the lower mold base 3 is precisely fixed. At this time, the force on the lower mold base 3 is entirely borne by the lifting rods 542 of the lifting structures 54 on both sides. Multiple lifting rods 542 move synchronously under the drive of the linear actuator 543, and through the guide fit of the support hole 5411 and the docking hole 32, the lifting force on the lower mold base 3 is evenly distributed, thus preventing the lower mold base 3 from tilting during the lifting process.

[0048] Reference Figure 10 Figure 11 As shown: Multiple positioning and docking components 62 are provided around the magnetic cover plate 61. The positioning and docking components 62 include docking posts 621, which correspond to the positioning holes 31 on the lower mold base 3.

[0049] After stamping is completed, the upper die base 2 moves upward to leave a gap for placing the magnetic cover plate 61. The positioning hole 31 on the lower die base 3 is in an empty state. The operator or automated equipment grabs the magnetic cover plate 61 to cover the lower die base 3. The docking posts 621 around the magnetic cover plate 61 are aligned with the positioning holes 31 on the lower die base 3. During the placement of the magnetic cover plate 61, the docking posts 621 around the magnetic cover plate 61 first contact the positioning holes 31 on the lower die base 3. As the magnetic cover plate 61 is lowered, the docking posts 621 are inserted into the positioning holes 31 along the axial direction of the positioning holes 31. The cooperation between the positioning holes 31 and the docking posts 621 restricts the displacement of the magnetic cover plate 61, ensuring that the magnetic cover plate 61 can accurately cover the stamped part, thereby avoiding the problem of the magnetic cover plate 61 not fitting tightly with the stamped part due to placement misalignment.

[0050] Reference Figure 2 , Figure 10 and Figure 11 As shown: The clamping assembly 6 also includes multiple magnetic attraction control assemblies 63, which are respectively disposed in multiple positioning holes 31. The magnetic attraction control assemblies 63 are used to provide attraction force to the magnetic cover plate 61 towards the lower mold base 3.

[0051] Specifically, the magnetic attraction control component 63 includes an electromagnetic ring 631, which is installed in the positioning hole 31. The positioning docking component 62 also includes a permanent magnet 622, which is disposed inside the docking post 621.

[0052] When the mating post 621 of the magnetic cover plate 61 is inserted into the positioning hole 31 of the lower mold base 3, the magnetic attraction control component 63 is activated. The electromagnetic ring 631 is energized to generate a magnetic field opposite to that of the permanent magnet 622, and an attraction is formed between them. This attraction attracts the magnetic cover plate 61 onto the lower mold base 3, ensuring that the magnetic cover plate 61 and the lower mold base 3 are tightly fitted together, preventing the magnetic cover plate 61 from loosening due to centrifugal force or vibration from the rotation of the main shaft 51. During the rotation of the lower mold base 3 driven by the main shaft 51, the electromagnetic ring 631 remains energized and its magnetism remains unchanged, continuously acting with the attraction force of the permanent magnet 622. When the lower mold base 3 rotates 1... After 80 degrees, the magnetic cover plate 61 is located at the lower end of the lower mold base 3, and the stamped part has fallen onto the magnetic cover plate 61. At this time, multiple electromagnetic rings 631 synchronously change the direction of current, and the magnetism is reversed accordingly. A repulsive force is generated between the electromagnetic rings 631 and the permanent magnet 622. This repulsive force pushes the docking post 621 downward along the axis of the positioning hole 31, causing the docking post 621 to exit from the positioning hole 31. Since all magnetic control components 63 act synchronously, the magnetic cover plate 61 is subjected to uniform repulsive force at all points, thereby realizing the synchronous separation of the magnetic cover plate 61 from the lower mold base 3 as a whole, avoiding the pulling and deformation of the stamped part caused by local jamming.

[0053] Reference Figure 1 and Figure 2 As shown: A stamping die, including a lifting mechanism to prevent deformation of stamped automotive parts.

[0054] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A lifting mechanism for preventing deformation of stamped automotive parts, characterized in that, It includes a rectangular frame (1), an upper mold base (2) for mounting the upper mold, a lower mold base (3) for mounting the lower mold, a lifting and unloading mechanism (5), and a clamping assembly (6); The upper die holder (2) and the lower die holder (3) are arranged vertically within the rectangular frame (1). The upper die holder (2) is provided with multiple positioning pins (21), and the upper end of the upper die holder (2) is provided with a stamping driver (4). The lower die holder (3) is provided with positioning holes (31) that cooperate with the positioning pins (21). The lifting and unloading mechanism (5) includes a main shaft (51) and two lifting and tilting structures (52). The middle part of the main shaft (51) is connected to the lower mold base (3). Both ends of the main shaft (51) are connected to the rectangular frame (1) through bearing seats. The two lifting and tilting structures (52) are respectively set at both ends of the main shaft (51). The lifting and tilting structures (52) are used to convert the lifting motion of the upper mold base (2) into the rotational motion of the main shaft (51). The clamping assembly (6) includes multiple magnetic cover plates (61). The shape of the middle part of the magnetic cover plate (61) is the same as that of the upper mold. When the upper mold base (2) and the lower mold base (3) are separated, the magnetic cover plate (61) is attracted to the lower mold base (3). The lifting and unloading mechanism (5) also includes a movable connection structure (53) and two lifting structures (54); The movable connection structure (53) is used to movably connect the main spindle (51) and the lower mold base (3); Two lifting structures (54) are respectively set on both sides of the lower mold base (3). The lifting structures (54) are used to separate the main shaft (51) and the lower mold base (3). The active connection structure (53) includes a connection plate (531) and at least two guide connection assemblies (532); The connecting plate (531) is fixedly connected to the spindle (51); Two guide connecting components (532) are symmetrically arranged about the middle surface of the connecting plate (531), and the two ends of the guide connecting components (532) are connected to the connecting plate (531) and the lower mold base (3) respectively, in order to keep the lower surface of the connecting plate (531) and the lower mold base (3) parallel; The lifting structure (54) includes a mounting bracket (541), multiple lifting rods (542), and a linear actuator (543). The mounting bracket (541) is horizontally set, and the mounting bracket (541) has multiple support holes (5411) facing the middle of the rectangular frame (1). Multiple lifting rods (542) are slidably disposed in multiple support holes (5411); A linear actuator (543) is used to drive multiple lifting rods (542) to move synchronously along the axial direction of the support hole (5411).

2. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 1, characterized in that, The lifting and tilting structure (52) includes a rotating component (521), a lifting component (522), and a transmission component (523). The rotating assembly (521) includes an internal gear ring (5211) coaxial with and fixedly connected to the main shaft (51) and a first gear (5212) meshing with the internal gear ring (5211). The lifting component (522) is connected to the upper mold base (2); The transmission assembly (523) is used to convert the lifting motion of the lifting assembly (522) into the rotational motion of the first gear (5212).

3. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 2, characterized in that, The transmission assembly (523) includes a rotating shaft (5231), a second gear (5232), and a rack (5233). The rotating shaft (5231) is connected to the rectangular frame (1) through a bearing housing, and one end of the rotating shaft (5231) is connected to the first gear (5212); The second gear (5232) is connected to the other end of the shaft (5231); The rack (5233) meshes with the second gear (5232) and is connected to the lifting assembly (522). The upper half of the rack (5233) is a smooth part, and the lower half of the rack (5233) is a toothed part.

4. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 2, characterized in that, The lifting assembly (522) includes multiple guide rods (5221) and a moving block (5222); Multiple guide rods (5221) are vertically arranged, and the two ends of the guide rods (5221) are respectively connected to the upper and lower ends of the rectangular frame (1); The movable block (5222) is slidably connected to multiple guide rods (5221), the upper end of the movable block (5222) is connected to the upper mold base (2), and the rack (5233) is installed on the side of the movable block (5222).

5. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 1, characterized in that, The magnetic cover plate (61) is provided with multiple positioning docking components (62) around its perimeter. The positioning docking components (62) include docking posts (621), which correspond to the positioning holes (31) on the lower mold base (3).

6. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 1, characterized in that, The clamping assembly (6) also includes multiple magnetic attraction control assemblies (63), which are respectively disposed in multiple positioning holes (31). The magnetic attraction control assemblies (63) are used to provide magnetic attraction force to the magnetic cover plate (61) towards the lower mold base (3).

7. A stamping die, characterized in that, Including a lifting mechanism for preventing deformation of stamped automotive parts as described in any one of claims 1-6.

Images