Lifting mechanism for preventing deformation of stamped automobile parts and stamping die

Abstract

The invention relates to the technical field of automobile sheet metal stamping, in particular to a lifting mechanism and stamping die for preventing deformation of stamped automobile parts, comprising 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 positioning holes matched with the positioning columns are formed in the lower die holder; the lifting and discharging mechanism comprises a main shaft and two lifting and overturning structures, the middle of the main shaft is connected with the lower die holder, the two ends of the main shaft are connected with the rectangular rack through bearing seats, the two lifting and overturning structures are arranged at the two ends of the main shaft respectively, and the lifting and overturning structures are used for converting lifting motion of the upper die holder into rotating motion of the main shaft; the pressing assembly comprises a plurality of magnetic attraction cover plates, the magnetic attraction cover plates are the same as the upper die, and after the upper die base and the lower die base are separated, the magnetic attraction cover plates are attracted to the lower die base; the lifting and discharging mechanism and the pressing assembly are arranged, so that the problem of deformation caused by uneven stress when a stamping part is separated from the lower die is solved.

Description

TECHNICAL FIELD

[0001] 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 also relates to a stamping die. BACKGROUND

[0002] In the field of automobile part manufacturing, stamping forming is one of the core processes for rapid processing of sheet metal and is widely used in the production of key components such as body panels and structural components. However, as the automotive industry continues to demand higher precision and quality from parts, the problems exposed by traditional stamping mechanisms during the unloading process have become increasingly prominent, becoming an important factor restricting the improvement of product quality. After the traditional stamping mechanism completes stamping, the stamped parts are usually removed from the lower die directly by manual labor or simple mechanical arms. For large-area and complex-structure automobile parts (such as door inner panels and engine cover outer panels), due to the certain adhesion force between the stamped parts and the lower die after forming, local deformation may occur during unloading due to uneven stress.

[0003] Patent No. CN117444064B discloses a stamping die for automobile sheet metal parts that facilitates blanking. The die uses a buffer to buffer the top force of the electric push rod, making the lifting process of the sheet metal part more gentle and prolonging the time for the sheet metal part to separate from the lower die, thereby preventing damage to the sheet metal part caused by rapid lifting. At the same time, the die adjusts the inclination angle of the side plate by controlling the extension length of the two electric push rods, thereby achieving inclined unloading of the sheet metal part.

[0004] Although the above-mentioned scheme uses a buffer to allow the sheet metal part to separate from the lower die slowly and prevent deformation of the sheet metal part, during the lifting process, the sheet metal part is only stressed at the contact points with the buffer, and the remaining areas are not effectively supported, which may cause deformation due to local stress concentration. During the sliding unloading stage, the sheet metal part is only supported on both sides by the die side plates, with the middle part in a suspended state. For large-size sheet metal parts, when the distance between the two die side plates is large, the middle region may be deformed downward due to its own gravity, and the unloading deformation problem of large-area stamped parts cannot be fundamentally solved. SUMMARY

[0005] To solve the above problems, a lifting mechanism for preventing deformation of automobile parts during stamping is provided, which includes a lifting and unloading mechanism and a pressing assembly, thereby solving the deformation problem of the stamped part caused by uneven stress when separating from the lower die.

[0006] In order to solve the prior art problems, the present application provides a stamping automobile part deformation prevention lifting mechanism, which comprises a rectangular frame, an upper die seat for mounting an upper die, a lower die seat for mounting a lower die, a lifting and unloading mechanism and a pressing assembly; the upper die seat and the lower die seat are arranged in the rectangular frame in a top-to-bottom manner, a plurality of positioning columns are arranged on the upper die seat, the upper end of the upper die seat is provided with a stamping driver, and the lower die seat is provided with positioning holes 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 seat, the two ends of the main shaft are connected with the rectangular frame through bearing seats, and the two lifting and overturning structures are arranged at the two ends of the main shaft respectively; the lifting and overturning structure is used for converting the lifting movement of the upper die seat into the rotating movement of the main shaft; the pressing assembly comprises a plurality of magnetic cover plates, the middle part of the magnetic cover plate is shaped the same as the shape of the upper die, and the magnetic cover plate is adsorbed on the lower die seat after the upper die seat and the lower die seat are separated.

[0007] Preferably, the lifting and overturning structure comprises a rotating assembly, a lifting assembly and a transmission assembly; the rotating assembly comprises a ring gear coaxial with and fixedly connected with the main shaft and a first gear meshing with the ring gear; the lifting assembly is connected with the upper die seat; and the transmission assembly is used for converting the lifting movement of the lifting assembly into the rotating movement of the first gear.

[0008] Preferably, the transmission assembly comprises a rotating shaft, a second gear and a rack; the rotating shaft is connected with the rectangular frame through a bearing seat, one end of the rotating shaft is connected with the first gear; the second gear is connected with the other end of the rotating shaft; the rack is meshed with the second gear and connected with 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 comprises a plurality of guide rods and a moving block; the plurality of guide rods are vertically arranged, and the two ends of the guide rods are respectively connected with the upper and lower ends of the rectangular frame; the moving block is slidingly connected with the plurality of guide rods, the upper end of the moving block is connected with the upper die seat, and the rack is installed on the side surface of the moving block.

[0010] Preferably, the lifting and unloading mechanism further comprises a movable connection structure and two lifting structures; the movable connection structure is used for movably connecting the main shaft and the lower die seat; the two lifting structures are arranged on the two sides of the lower die seat respectively, and the lifting structure is used for separating the main shaft and the lower die seat.

[0011] Preferably, the movable connection structure comprises a connecting plate and at least two guide connection assemblies; the connecting plate is fixedly connected with the main shaft; the two guide connection assemblies are symmetrically arranged about the middle surface of the connecting plate, and the two ends of the guide connection assembly are respectively connected with the connecting plate and the lower die seat, so as to keep the lower surface of the connecting plate parallel to the lower surface of the lower die seat.

[0012] Preferably, the lifting structure comprises a mounting frame, a plurality of lifting rods and a linear driver; the mounting frame is horizontally arranged, and a plurality of support holes are formed in the mounting frame and face the middle part of the rectangular rack; the plurality of lifting rods are respectively and slidingly arranged in the plurality of support holes; and the linear driver is used for driving the plurality of lifting rods to move synchronously along the axial direction of the support holes.

[0013] Preferably, a plurality of positioning butt joint assemblies are arranged around the magnetic cover plate, and the positioning butt joint assembly comprises a butt joint column corresponding to the positioning hole on the lower die seat.

[0014] Preferably, the pressing assembly further comprises a plurality of magnetic control assemblies, the plurality of magnetic control assemblies are respectively arranged in the plurality of positioning holes, and the magnetic control assembly is used for providing the magnetic cover plate with an attractive force towards the lower die seat.

[0015] A stamping die comprises a lifting mechanism for preventing deformation of a stamped automobile part.

[0016] The present application has the following beneficial effects compared with the prior art: 1. The lifting and unloading mechanism and the pressing assembly are arranged, the magnetic cover plate in the pressing assembly is matched with the shape of the upper die, can be closely attached to the surface of the stamped part, and is adsorbed on the lower die seat by magnetic force, so as to fix the stamped part and provide a stable basis for subsequent turnover and unloading, avoid loosening and displacement of the stamped part before turnover, and convert the lifting movement of the upper die seat into the rotary movement of the main shaft through the two lifting turnover structures in the lifting and unloading mechanism, and the synchronous rotation of the main shaft and the lower die seat is ensured through the synergistic effect of the two end lifting turnover structures, the magnetic cover plate is located at the lower end of the lower die seat to receive the stamped part after turnover, and the magnetic cover plate uniformly supports the stamped part as a whole when the stamped part is separated from the lower die, thereby solving the problem of deformation of the stamped part caused by uneven stress when the stamped part is separated from the lower die.

[0017] 2. The rotating assembly, the lifting assembly and the transmission assembly are arranged, the lifting assembly is connected with the upper die seat, can transmit the lifting and lowering action of the upper die seat to the transmission assembly and the rotating assembly, realize the conversion from linear motion to rotary motion, drive the first gear to rotate forward when the upper die seat is lifted, drive the main shaft to rotate forward through the inner ring gear, drive the first gear to rotate reversely when the upper die seat is lowered, realize reverse rotation of the main shaft, and thereby realize the linkage between the movement of the upper die seat and the turnover movement of the main shaft.

[0018] 3. The rotating shaft, the second gear and the rack are arranged, the smooth part of the rack does not drive the transmission assembly when the upper die seat is initially lifted, the lower die seat remains horizontal to ensure that the positioning column is smoothly separated, the rack teeth are engaged with the second gear to stably convert the lifting and lowering movement of the upper die seat into the rotary power of the main shaft, realize turnover of the lower die seat through forward rotation, and complete resetting through reverse rotation, and the segmented design of the smooth part and the teeth part of the rack realizes the control of the state of the lower die seat in different movement stages of the upper die seat. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a kind of anti-punch automobile parts deformation lifting mechanism and punch mould of the application Figure One .

[0020] Figure 2 is a kind of anti-punch automobile parts deformation lifting mechanism and punch mould of the application Figure Two .

[0021] Figure 3 is a kind of anti-punch automobile parts deformation lifting mechanism in the rectangular frame, main shaft, lifting and overturning structure and movable connection structure of the application.

[0022] Figure 4 is a kind of anti-punch automobile parts deformation lifting mechanism in the rotating assembly, lifting assembly and transmission assembly of the application.

[0023] Figure 5 is a kind of anti-punch automobile parts deformation lifting mechanism in the rotating assembly and transmission assembly of the application.

[0024] Figure 6 is a kind of anti-punch automobile parts deformation lifting mechanism in the lifting assembly and transmission assembly of the application.

[0025] Figure 7 is a kind of anti-punch automobile parts deformation lifting mechanism in the lower die seat, main shaft, movable connection structure and lifting structure of the application.

[0026] Figure 8 is a kind of anti-punch automobile parts deformation lifting mechanism in the lower die seat, main shaft, connecting plate and guide connection assembly of the application.

[0027] Figure 9 is a kind of anti-punch automobile parts deformation lifting mechanism in the lower die seat, mounting bracket, lifting rod and linear driver of the application.

[0028] Figure 10 is a kind of anti-punch automobile parts deformation lifting mechanism in the lower die seat, magnetic cover plate and positioning butt joint assembly of the application.

[0029] Figure 11 is a kind of anti-punch automobile parts deformation lifting mechanism in the lower die seat, magnetic cover plate, positioning butt joint assembly and magnetic control assembly of the application.

[0030] The figure marks are: 1, rectangular frame; 2, upper die holder; 21, positioning column; 3, lower die holder; 31, positioning hole; 32, butt joint hole; 4, stamping driver; 5, lifting unloading mechanism; 51, main shaft; 52, lifting turnover structure; 521, rotating assembly; 5211, inner 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 frame; 5411, support hole; 542, lifting rod; 543, linear driver; 6, compression assembly; 61, magnetic cover plate; 62, positioning butt joint assembly; 621, butt joint column; 622, permanent magnet; 63, magnetic control assembly; 631, electromagnetic ring. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in combination with the drawings and specific embodiments.

[0032] Reference Figures 1 to 11 As shown in the figure: a lifting mechanism for preventing deformation of stamping automobile parts, comprising a rectangular frame 1, an upper die holder 2 for installing an upper die, a lower die holder 3 for installing a lower die, a lifting unloading mechanism 5 and a compression assembly 6; the upper die holder 2 and the lower die holder 3 are arranged in the rectangular frame 1 in an up-down manner, the upper die holder 2 is provided with a plurality of positioning columns 21, the upper end of the upper die holder 2 is provided with a stamping driver 4, and the lower die holder 3 is provided with positioning holes 31 matched with the positioning columns 21; the lifting unloading mechanism 5 comprises a main shaft 51 and two lifting turnover structures 52, the middle part of the main shaft 51 is connected with the lower die holder 3, both ends of the main shaft 51 are connected with the rectangular frame 1 through bearing seats, and the two lifting turnover structures 52 are respectively arranged at both ends of the main shaft 51, the lifting turnover structure 52 is used for converting the lifting movement of the upper die holder 2 into the rotating movement of the main shaft 51; the compression assembly 6 comprises a plurality of magnetic cover plates 61, the middle part of the magnetic cover plate 61 is shaped the same as the shape of the upper die, and when the upper die holder 2 and the lower die holder 3 are separated, the magnetic cover plate 61 is adsorbed on the lower die holder 3.

[0033] First, the steel plate to be punched is placed on the lower die of the lower die holder 3, the punch driving device 4 is started, and the punch driving device 4 drives the upper die holder 2 carrying the upper die to move quickly towards the lower die holder 3. During the movement, the positioning column 21 of the upper die holder 2 is inserted into the positioning hole 31 of the lower die holder 3, ensuring that the upper die and the lower die are aligned. When the upper die holder 2 contacts the lower die holder 3, the steel plate is punched and formed under the action of the closing of the upper die and the lower die, forming the required punched part. After the punching is completed, the punch driving device 4 first drives the upper die holder 2 to move upward by a distance, so that a gap capable of accommodating the magnetic cover plate 61 is formed between the upper die holder 2 and the lower die holder 3. Then, the magnetic cover plate 61 with the same shape as the upper die is covered on the lower die holder 3. Since the magnetic cover plate 61 is matched with the shape of the upper die, it can be tightly attached to the upper surface of the punched part. At the same time, the magnetic cover plate 61 is magnetically attracted to the lower die holder 3, which stably fixes the punched part on the lower die of the lower die holder 3. The punch driving device 4 drives the upper die holder 2 to move upward again. At this time, the upward movement of the upper die holder 2 is converted into the rotary motion of the main shaft 51 through the lifting and overturning structure 52 at both ends. The two lifting and overturning structures 52 ensure that the main shaft 51 rotates synchronously at both ends, thereby driving the lower die holder 3 connected to the middle part of the main shaft 51 to rotate synchronously. When the lower die holder 3 rotates by 180 degrees, the magnetic cover plate 61 originally covering the upper part of the lower die holder 3 is turned to the lower end of the lower die holder 3. The punched part covered by the magnetic cover plate 61 falls on the magnetic cover plate 61 due to gravity. Finally, the magnetic cover plate 61 is separated from the lower die holder 3, and the punched part is separated from the lower die along with the magnetic cover plate 61. Through the magnetic cover plate 61 with the same shape as the upper die, uniform support is provided to the punched part during unloading, thereby solving the problem of deformation of the punched part caused by uneven stress when it is separated from the lower die.

[0034] Referring to Figure 2 , Figure 3 and Figure 4 , the lifting and overturning structure 52 includes a rotating assembly 521, a lifting assembly 522, and a transmission assembly 523. The rotating assembly 521 includes an inner ring gear 5211 coaxial with the main shaft 51 and fixedly connected thereto, and a first gear 5212 engaged with the inner ring gear 5211. The lifting assembly 522 is connected to the upper die holder 2. The transmission assembly 523 is used to convert the lifting motion of the lifting assembly 522 into the rotary motion of the first gear 5212.

[0035] When the stamping process is completed, the stamping driver 4 drives the upper die seat 2 to move upward, and the lifting assembly 522 connected with the upper die seat 2 moves upward synchronously, at this time, the upward movement of the lifting assembly 522 is transmitted to the first gear 5212 through the transmission assembly 523, drives the first gear 5212 to rotate forward, and the rotating force of the first gear 5212 is transmitted to the inner ring gear 5211 through the meshing action of the teeth, drives the inner ring gear 5211 to rotate forward synchronously, and the forward rotation of the inner ring gear 5211 directly drives the main shaft 51 to rotate synchronously, which provides power for the main shaft 51 to drive the lower die seat 3 to overturn. When the next stamping is performed, the stamping driver 4 drives the upper die seat 2 to move downward, and the lifting assembly 522 moves downward synchronously with the upper die seat 2, the downward movement of the lifting assembly 522 is transmitted to the first gear 5212 through the transmission assembly 523, drives the first gear 5212 to rotate reversely, the reverse rotation of the first gear 5212 drives the inner ring gear 5211 to rotate reversely through the meshing relationship with the inner ring gear 5211, and then drives the main shaft 51 to overturn reversely with the inner ring gear 5211. When the main shaft 51 reversely rotates by 180 degrees, the lifting assembly 522 stops rotating the first gear 5212 through the transmission assembly 523, and the main shaft 51 completes the reset action. By connecting the lifting assembly 522 with the upper die seat 2, the lifting action of the upper die seat 2 can be transmitted to the transmission assembly 523 and the rotating assembly 521 in real time, so that the movement of the upper die seat 2 and the overturning movement of the main shaft 51 are linked.

[0036] Referring to 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 with the rectangular rack 1 through a bearing seat, one end of the rotating shaft 5231 is connected with the first gear 5212; the second gear 5232 is connected with the other end of the rotating shaft 5231; the rack 5233 is meshed with the second gear 5232 and connected with 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.

[0037] After the stamping is completed, the upper die holder 2 enters the initial stage of separation from the lower die holder 3, at which time the positioning column 21 of the upper die holder 2 needs to be separated from the positioning hole 31 of the lower die holder 3, the lower die holder 3 needs to be kept in a horizontal state, the upper die holder 2 is moved 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 toothed and engaged, the rising movement of the rack 5233 will not drive the second gear 5232 to rotate, the rotating shaft 5231 and the first gear 5212 also remain stationary, the main shaft 51 does not rotate, and the lower die holder 3 is stably kept horizontal, ensuring that the positioning column 21 smoothly separates from the positioning hole 31. After the magnetic cover plate 61 is adsorbed on the lower die holder 3, the upper die holder 2 is moved upward again, the rack 5233 is moved upward to a position where the teeth are engaged with the second gear 5232, at which time the upward movement of the rack 5233 drives the second gear 5232 to rotate in a forward direction through the tooth engagement of the teeth with the second gear 5232, the rotation of the second gear 5232 is transmitted to the first gear 5212 at the other end through the rotating shaft 5231, driving the first gear 5212 to rotate in a synchronous forward direction, and then driving the internal tooth ring 5211 engaged therewith to rotate, realizing the rotation of the main shaft 51. When stamping again, the upper die holder 2 is first moved downward, at which time the rack 5233 is moved downward synchronously with the lifting assembly 522, the teeth of the rack 5233 remain engaged with the second gear 5232, the downward movement of the rack 5233 drives the second gear 5232 to rotate in a reverse direction, the first gear 5212 is driven to rotate in a reverse direction through the rotating shaft 5231, and then the internal tooth ring 5211 and the main shaft 51 are driven to rotate in a reverse direction, realizing the resetting of the lower die holder 3. When the lower die holder 3 is completely reset, the rack 5233 continues to move downward, the teeth are separated from the second gear 5232, and the smooth part is in contact with 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 is stably stationary, ensuring that the upper die holder 2 can accurately move downward for stamping work. Through the segmented design of the smooth part and the teeth of the rack 5233, the state of the lower die holder 3 in different movement stages of the upper die holder 2 is controlled.

[0038] Referring to Figure 4 and Figure 6 , the lifting assembly 522 includes a plurality of guide rods 5221 and a moving block 5222. The plurality of guide rods 5221 are vertically arranged, and the two ends of the guide rods 5221 are respectively connected with the upper and lower ends of the rectangular frame 1. The moving block 5222 is slidingly connected with the plurality of guide rods 5221, the upper end of the moving block 5222 is connected with the upper die holder 2, and the rack 5233 is installed on the side surface of the moving block 5222.

[0039] The upper die holder 2 moves upward under the drive of the stamping driver 4, the moving block 5222 slides upward along the vertical guide rod 5221 synchronously with the upper die holder 2, the plurality of guide rods 5221 provide vertical guidance for the moving block 5222, ensure that the moving block 5222 does not deviate or shake during the upward movement, drive the upper die holder 2 to rise smoothly, at this time, the rack 5233 installed on the side of the moving block 5222 rises synchronously with the moving block 5222, before stamping again, the moving block 5222 slides downward along the guide rod 5221 synchronously, the guide rod 5221 ensures that the moving block 5222 drives the rack 5233 to move vertically downward, so that the teeth of the rack 5233 and the second gear 5232 remain stable engagement, and the descending power is transmitted to the transmission assembly 523 to drive the second gear 5232 to rotate in reverse, so as to reset the lower die holder 3, when the lower die holder 3 is completely reset, the moving block 5222 continues to move downward, the teeth of the rack 5233 are separated from the second gear 5232, and the smooth part is in contact with the second gear 5232, at this time, the guide rod 5221 still provides stable guidance for the moving block 5222, ensures that the smooth part of the rack 5233 and the second gear 5232 are aligned, cuts off the power transmission, and makes the main shaft 51 remain stationary, provides stable support for precise downward stamping of the upper die holder 2, and through the plurality of vertical guide rods 5221, the moving block 5222 is provided with rigid guidance constraint, ensures that the moving block 5222 and the rack 5233 always move smoothly along the vertical direction, thereby avoiding deviation or shaking of the rack 5233 during the lifting process, and providing a basic guarantee for the engagement and disengagement of the rack 5233 and the second gear 5232.

[0040] Referring to Figure 2 and Figure 7 , the lifting and unloading mechanism 5 further comprises a movable connection structure 53 and two lifting structures 54; the movable connection structure 53 is used for movably connecting the main shaft 51 and the lower die holder 3; the two lifting structures 54 are arranged on the two sides of the lower die holder 3 respectively, and the lifting structure is used for separating the main shaft 51 and the lower die holder 3.

[0041] 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, and the main shaft 51 may be bent due to excessive force, therefore, the movable connection structure 53 and the two lifting structures 54 are arranged, the movable connection structure 53 can keep the lower die holder 3 and the main shaft 51 synchronous rotation 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 the two sides of the lower die holder 3, apply an upward supporting force to the lower die holder 3, so that the lower die holder 3 is separated from the main shaft 51 through the movable connection structure 53, therefore, the downward impact force received by the lower die holder 3 is no longer transmitted to the main shaft 51, but is dispersedly transmitted to the rectangular rack 1 through the two lifting structures 54 on the sides, avoiding that the main shaft 51 bears excessive load, thereby solving the problem that the main shaft 51 is bent due to excessive force.

[0042] Referring toFigure 7 and Figure 8 As shown in FIG. 5 and FIG. 6, the movable connection structure 53 comprises a connecting plate 531 and at least two guide connection assemblies 532; the connecting plate 531 is fixedly connected with the main shaft 51; the two guide connection assemblies 532 are symmetrically arranged about the middle surface of the connecting plate 531, and the two ends of the guide connection assembly 532 are respectively connected with the connecting plate 531 and the lower die seat 3, for keeping the connecting plate 531 parallel to the lower surface of the lower die seat 3.

[0043] Specifically, the guide connection assembly 532 comprises a plurality of connecting bolts 5321, one end of the connecting bolt 5321 penetrates through the connecting plate 531 and is fixedly connected with the lower die seat 3, the connecting plate 531 is slidingly connected with the connecting bolt 5321, a spring 5322 is sleeved on the connecting bolt 5321, and the two ends of the spring 5322 are respectively abutted against the connecting plate 531 and the end of the connecting bolt 5321.

[0044] Before the stamping operation, the lower die seat 3 moves upward under the action of the lifting structure 54 against the compression pre-tightening force of the spring 5322, synchronously moves upward with the fixed connecting bolt 5321 of the lower die seat 3, the connecting plate 531 and the connecting bolt 5321 slide relative to each other, the lower die seat 3 is separated from the connecting plate 531, the spring 5322 is further compressed to store elastic potential energy, the stress support point of the lower die seat 3 is transferred to the lifting structure 54, after the stamping is completed, the lifting structure 54 withdraws the support force, the spring 5322 in the compressed state releases the elastic force, pushes the lower die seat 3 downward through the connecting bolt 5321, and makes the lower die seat 3 abut against the connecting plate 531 again, when the main shaft 51 rotates under the driving of the lifting and overturning structure 52, the connecting plate 531 drives the lower die seat 3 to rotate synchronously around the axis of the main shaft 51, so that the lower die seat 3 can be separated to isolate the load before stamping, and can be tightly attached to synchronous rotation when overturning, thereby meeting the differentiated needs of the connecting relationship between the connecting plate 531 and the lower die seat 3 in different processes.

[0045] Referring to Figure 7 and Figure 9 As shown in FIG. 5 and FIG. 6, the lifting structure 54 comprises a mounting frame 541, a plurality of lifting rods 542 and a linear driver 543; the mounting frame 541 is horizontally arranged, and a plurality of support holes 5411 are formed in the mounting frame 541 and face the middle part of the rectangular rack 1; the plurality of lifting rods 542 are slidingly arranged in the plurality of support holes 5411 respectively, and a plurality of butt joint holes 32 are formed in the side wall of the lower die seat 3 and butt joint with the lifting rods 542; the linear driver 543 is used to drive the plurality of lifting rods 542 to move synchronously along the axis direction of the support hole 5411.

[0046] When the lower die holder 3 is in a horizontal state, i.e. before the stamping operation, the axis position of the support hole 5411 on the mounting frame 541 is slightly higher than the axis of the butt joint hole 32 of the side wall of the lower die holder 3. At this time, the lifting structure 54 works, the linear drive 543 is started, and the multiple lifting rods 542 are driven to translate synchronously along the axis direction of the support hole 5411 towards the lower die holder 3. Before the lifting rod 542 enters the butt joint hole 32, the end of the lifting rod 542 first butt joints with the opening of the butt joint hole 32 of the lower die holder 3. Then the transverse movement of the lifting rod 542 will exert an upward force on the lower die holder 3, and the lower die holder 3 will move upward against the compression pre-tightening force of the spring 5322 in the movable connection structure 53. When the lifting rod 542 is completely inserted into the butt joint hole 32, the lifting rod 542 is tightly matched with the butt joint hole 32, and the position of the lower die holder 3 is accurately fixed. At this time, the force on the lower die holder 3 is completely borne by the lifting rods 542 of the two lifting structures 54, and the multiple lifting rods 542 move synchronously under the drive of the linear drive 543 and are guided by the support hole 5411 and the butt joint hole 32, thereby ensuring that the lifting force on the lower die holder 3 is evenly distributed, and avoiding the inclination of the lower die holder 3 during lifting.

[0047] Referring to Figure 10 Figure 11 As shown in the figure, multiple positioning butt joint assemblies 62 are arranged around the magnetic cover plate 61, and the positioning butt joint assembly 62 includes a butt joint column 621 corresponding to the positioning hole 31 on the lower die holder 3.

[0048] When the stamping is completed, the positioning hole 31 on the lower die holder 3 is in an idle state after the upper die holder 2 moves upward to leave a gap for placing the magnetic cover plate 61. An operator or automatic equipment grasps the magnetic cover plate 61 to cover the lower die holder 3. The butt joint columns 621 around the magnetic cover plate 61 are corresponded to the positioning holes 31 on the lower die holder 3. During the placement of the magnetic cover plate 61, the butt joint columns 621 around the magnetic cover plate 61 first contact the positioning holes 31 on the lower die holder 3. With the lowering of the magnetic cover plate 61, the butt joint columns 621 are inserted into the positioning holes 31 along the axis direction of the positioning holes 31. The displacement of the magnetic cover plate 61 is limited by the cooperation between the positioning holes 31 and the butt joint columns 621, so that the magnetic cover plate 61 can accurately cover above the stamped part, thereby avoiding the problem that the magnetic cover plate 61 does not tightly fit with the stamped part due to placement deviation.

[0049] Referring to Figure 2 , Figure 10 and Figure 11 As shown in the figure, the pressing assembly 6 further includes multiple magnetic attraction control assemblies 63, and the multiple magnetic attraction control assemblies 63 are respectively arranged in the multiple positioning holes 31. The magnetic attraction control assembly 63 is used for providing an attractive force towards the lower die holder 3 for the magnetic cover plate 61.

[0050] Specifically, the magnetic attraction control assembly 63 includes an electromagnetic ring 631 installed in the positioning hole 31, and the positioning docking assembly 62 further includes a permanent magnet 622 arranged inside the docking column 621.

[0051] When the docking column 621 of the magnetic attraction cover plate 61 is inserted into the positioning hole 31 of the lower mold base 3, the magnetic attraction control assembly 63 is started, the electromagnetic ring 631 is powered to generate a magnetic field opposite to the permanent magnet 622, and an attractive force is formed between the two, which attracts the magnetic attraction cover plate 61 to the lower mold base 3, ensures that the magnetic attraction cover plate 61 is tightly attached to the lower mold base 3, and avoids the centrifugal force or vibration of the main shaft 51 causing the magnetic attraction cover plate 61 to loosen. During the rotation of the main shaft 51 driving the lower mold base 3, the electromagnetic ring 631 remains powered and the magnetism remains unchanged, and the attractive force of the permanent magnet 622 continues to act. When the lower mold base 3 rotates 180 degrees, the magnetic attraction cover plate 61 is at the lower end of the lower mold base 3, and the stamping part has fallen on the magnetic attraction cover plate 61. At this time, the plurality of electromagnetic rings 631 synchronously change the current direction, and the magnetism is reversed. The electromagnetic ring 631 and the permanent magnet 622 generate a repulsive force, which pushes the docking column 621 downward along the axis direction of the positioning hole 31, so that the docking column 621 exits from the positioning hole 31. Since all the magnetic attraction control assemblies 63 act synchronously, the magnetic attraction cover plate 61 is subjected to uniform repulsive force everywhere, so that the magnetic attraction cover plate 61 is synchronously separated from the lower mold base 3 as a whole, avoiding the deformation of the stamping part caused by local jamming.

[0052] Referring to Figure 1 and Figure 2 It is shown that a stamping die includes a lifting mechanism for preventing deformation of a stamped automobile part.

[0053] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to 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).

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 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).

6. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 5, characterized in that, 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 main shaft (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.

7. The lifting mechanism for preventing deformation of stamped automotive parts according to claim 5, characterized in that, 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).

8. 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).

9. 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).

10. A stamping die, characterized in that, Including a lifting mechanism for preventing deformation of stamped automotive parts as described in any one of claims 1-9.

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