Automobile door stamping die

Abstract

The invention belongs to the technical field of stamping dies, and particularly relates to an automobile door stamping die which comprises a stamping platform, a lower die is fixedly connected to the upper end of the stamping platform, an upper die is slidably arranged over the lower die in the vertical direction, and two stamping heads are rotatably connected to the upper die in a penetrating mode. And the two punching heads are symmetrically arranged. By arranging the stamping speed adjusting mechanism, in the stamping operation process, a temperature sensor in a stamping head can transmit temperature data of the stamping head to a PLC in real time, the position of an L-shaped rod on a rotating disc is further controlled through the PLC, and when the temperature of the stamping head is in a high state, the stamping head is driven to rotate by the PLC. And the hydraulic oil discharged into the hydraulic rod in unit time is less, so that the punching speed of the hydraulic rod for driving the upper die and the punching head to move downwards is reduced, and excessive abrasion of the punching head caused by too high temperature of the punching head is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of stamping dies, and in particular relates to a stamping die for an automobile door. Background Art

[0002] Automobile door stamping dies can form various parts of automobile doors through stamping process. They are used to process metal sheets (such as steel or aluminum) into door shapes, linings, reinforcements and other parts to meet the requirements of automobile manufacturing.

[0003] When stamping a car door, it is usually necessary to punch holes in it through a die to provide the door with installation holes, drainage holes, ventilation holes, etc. These holes are very important for the functionality of the door. The prior art, such as a car door stamping die disclosed in China Publication No. CN109226496B, can move the side panel toward the workbench under the action of the elastic fixing member after the car door is formed, and use a push rod to push the formed car door, which facilitates the disassembly of the car door after forming. However, the above-mentioned car door stamping die still has the following technical problems when performing stamping operations: The stamping speed cannot be adjusted in real time according to the temperature of the mold, resulting in the temperature of the mold itself rising after a long period of work, thereby accelerating the wear and thermal fatigue of the mold and reducing the life of the mold. At the same time, due to the mutual contact between the mold and the car door, the temperature of the car door will also rise, causing the ductility of the car door to increase, causing the car door to be easily excessively deformed during the stamping process, reducing the processing effect of the car door. Summary of the invention

[0004] The purpose of the present invention is to provide a car door stamping die that can adjust the stamping speed in real time according to the temperature of the die and avoid excessive wear of the stamping head due to excessive temperature of the stamping head in order to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A stamping die for a car door, comprising a stamping platform, a lower die is fixedly connected to the upper end of the stamping platform, an upper die is driven and arranged in a vertical direction just above the lower die, and two stamping heads are symmetrically penetrated and rotatably connected to the upper die; A stamping speed adjustment mechanism is used to adjust the stamping speed of the stamping head according to the temperature of the stamping head. The stamping speed adjustment mechanism includes a turntable rotatably connected to the upper end of the stamping platform. The bottom wall of the stamping platform is fixedly connected to a servo motor for driving the turntable to rotate. A slide groove is provided on the turntable, and an L-shaped rod is slidably connected in the slide groove. An electric push rod for driving the L-shaped rod is provided in the slide groove. A temperature sensor is provided inside the stamping head. A PLC controller is provided at the upper end of the stamping platform. The PLC controller is electrically connected to the temperature sensor and the electric push rod, and the PLC controller adjusts the extension and retraction of the electric push rod according to the temperature data fed back by the temperature sensor. A hydraulic rod is fixedly installed at the position directly above the upper mold, and a driving component for driving the upper mold and the stamping head to move downward for stamping operations is provided between the L-shaped rod and the hydraulic rod.

[0006] Preferably, the upper end of the stamping platform is fixedly connected to a guide pillar, and both side walls of the upper mold are fixedly connected to guide blocks slidably sleeved on the guide pillar.

[0007] Preferably, the driving assembly includes a liquid storage tank fixedly connected to the upper end of the stamping platform, a liquid pumping cylinder is provided at the upper end of the stamping platform, an infusion tube is fixedly connected between the liquid storage tank and the liquid pumping cylinder, a piston plate is sealingly and slidingly connected in the liquid pumping cylinder, a block is fixedly connected in the liquid pumping cylinder, a first spring is provided between the piston plate and the two blocks, a discharge tube is fixedly connected between the hydraulic rod and the liquid pumping cylinder, and a first one-way valve is provided in the infusion tube and the discharge tube, an infusion space is formed between the liquid storage tank, the liquid pumping cylinder, the infusion tube, the discharge tube and the hydraulic rod, and the infusion space is filled with hydraulic oil, an extension rod is fixedly connected to one end of the piston plate close to the L-shaped rod, an abutment wheel is rotatably connected to one end of the extension rod close to the L-shaped rod, and an abutment plate that abuts against the abutment wheel is fixedly connected to the L-shaped rod.

[0008] Preferably, a liquid pump is provided between the hydraulic rod and the liquid storage tank, and the liquid pump is used to pump the hydraulic oil in the hydraulic rod back into the liquid storage tank after the stamping operation is completed.

[0009] Preferably, a positioning stamping mechanism controlled by a turntable is provided above the stamping platform, which is used to clamp and position the car door before stamping. The positioning stamping mechanism includes an annular liquid guide frame fixedly connected to the upper end of the stamping platform, and the annular liquid guide frame is also filled with hydraulic oil. The annular liquid guide frame is sealingly rotatably connected to the peripheral side wall of the turntable. The outer peripheral surface of the turntable is provided with a plurality of centrifugal grooves connected to the annular liquid guide frame, each of the centrifugal grooves is sealingly and slidably connected with a piston block, and each of the piston blocks is elastically connected to the inside of the centrifugal groove with a second spring. The two sides of the annular liquid guiding frame are respectively fixedly connected with the first liquid guiding channel and the second liquid guiding channel, the two side ends of the first liquid guiding channel are sealed and slidably connected with the first push rod, the parts of the two first push rods extending outside the first liquid guiding channel are fixedly connected with the clamping plate, an automatic pressure relief valve is provided in the second liquid guiding channel, the two side ends of the second liquid guiding channel are sealed and slidably connected with the second push rod, the upper end of the stamping platform is slidably connected with a slider in the horizontal direction, the upper end of the slider is fixedly connected to the bottom wall of the liquid pumping cylinder, and the slider is fixedly connected to the two second push rods.

[0010] Preferably, two sets of rotating mechanisms are symmetrically provided above the upper mold, which are used to drive the punch head to rotate while moving downward. The rotating mechanism includes a support block fixedly connected to the upper end of the upper mold, and a transmission rod is rotatably connected to the support block. The end of the transmission rod and the punch head that is close to each other is provided with mutually meshing bevel gears, and the end of the transmission rod away from the bevel gear is fixedly connected to a transmission gear. The upper end of the stamping platform is fixedly connected to a rack that meshes with the transmission gear in the vertical direction.

[0011] Preferably, two groups of lubrication mechanisms driven by the rotating mechanism are also provided above the upper mold for lubricating the stamping position during the stamping process, the lubrication mechanism includes a screw coaxially fixedly connected to the stamping head, a lubrication cylinder is fixedly installed above the upper mold, the inner wall of the lubrication cylinder is sealed and slidably connected with a threaded cylinder in the vertical direction, the threaded cylinder is threadedly connected to the screw, a lubrication box is fixedly installed above the upper mold, an extraction pipe is fixedly connected between the lubrication box and the lubrication cylinder, a lubrication pipe is connected on the outer wall of the lubrication cylinder, the lubrication pipe extends to the bottom of the upper mold and its bottom is fixedly connected with an annular lubrication channel, and a second one-way valve is provided in both the extraction pipe and the lubrication pipe.

[0012] Preferably, the inner walls on both sides of the lubricating cylinder are provided with limiting grooves in the vertical direction, and the outer walls on both sides of the threaded cylinder are fixedly connected with limiting strips that are sealingly slidable in the limiting grooves.

[0013] Compared with the existing technology, the advantages of this automobile door stamping die are: 1. The present invention sets a stamping speed adjustment mechanism. During the stamping operation, the temperature sensor inside the stamping head can transmit the temperature data of the stamping head to the PLC controller in real time, and further control the position of the L-shaped rod on the turntable through the PLC controller. When the temperature of the stamping head is at a high state, less hydraulic oil is discharged into the hydraulic rod per unit time, so that the stamping speed of the hydraulic rod driving the upper mold and the stamping head to move downward is slowed down, avoiding excessive wear of the stamping head due to excessive temperature of the stamping head and extending the service life of the stamping head. When the temperature of the stamping head is at a low state, more hydraulic oil is discharged into the hydraulic rod per unit time, which increases the stamping speed of the hydraulic rod driving the upper mold and the stamping head to move downward, thereby improving the stamping efficiency.

[0014] 2. The present invention sets a positioning stamping mechanism. During the stamping operation, the rotation of the turntable generates centrifugal force and drives the piston block to slide in the centrifugal groove, and the hydraulic oil in the annular liquid guide frame is first discharged into the first liquid guide channel, so that the two clamping plates are close to each other, and the automobile door embryo plate is first clamped and positioned, and then the hydraulic oil in the annular liquid guide frame is discharged into the second liquid guide channel, so that the pumping cylinder is moved to the abutment wheel and the abutment plate to cooperate with each other. Before the stamping operation, the automobile door can be positioned first to prevent the automobile door from deviating from its position during the stamping process, and the accuracy of the stamping position of the automobile door can be ensured. After the positioning is completed, the automobile door is immediately stamped, which improves the work continuity and greatly improves the work efficiency.

[0015] 3. The present invention sets a rotating mechanism. During the stamping operation, the upper die drives the punch head to move downward, so that the transmission gear moves vertically along the rack, thereby driving the transmission rod to rotate, and further driving the punch head to rotate through two bevel gears. The rotational motion of the punch head converts part of the force during stamping into rotational inertia, reducing the overall load on the punch head and increasing the service life of the punch head.

[0016] 4. The present invention provides a lubrication mechanism. During the stamping operation, the rotation of the punch head will drive the screw to rotate, and then drive the threaded barrel to move upward in the vertical direction inside the lubrication barrel, and the lubricating oil in the lubrication barrel is discharged into the annular lubrication channel through the lubrication pipe. The lubricating oil can slide downward along the peripheral side wall of the punch head through the annular lubrication channel. During the stamping operation, the punch head and the car door are lubricated to reduce friction, reduce energy consumption during the stamping process, and improve processing efficiency. At the same time, it can reduce burrs and scratches generated during the stamping process, thereby improving the surface quality of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the local structure of the turntable in the present invention; Figure 3 It is a partial structural schematic diagram of the driving component in the present invention; Figure 4 It is a partial structural schematic diagram of the punching positioning mechanism in the present invention; Figure 5 yes Figure 4 The enlarged view of point A in the middle; Figure 6 It is a schematic diagram of the local structure of the upper mold in the present invention; Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0018] In the figure: 1. stamping platform; 11. lower die; 12. upper die; 13. stamping head; 14. guide pillar; 15. guide block; 2. stamping speed adjustment mechanism; 21. turntable; 22. servo motor; 23. slideway; 24. L-shaped rod; 25. PLC controller; 26. hydraulic rod; 27. drive assembly; 271. liquid storage tank; 272. pumping cylinder; 273. infusion tube; 274. piston plate; 275. stopper; 276. first spring; 277. discharge tube; 278. extension rod; 279. abutment wheel; 2710. abutment plate; 3. positioning stamping machine Structure; 31. annular liquid guide frame; 32. centrifugal groove; 33. piston block; 34. second spring; 35. first liquid guide channel; 36. second liquid guide channel; 37. first push rod; 38. clamping plate; 39. second push rod; 310. slider; 4. rotating mechanism; 41. support block; 42. transmission rod; 43. bevel gear; 44. transmission gear; 45. rack; 5. lubrication mechanism; 51. screw; 52. lubrication cylinder; 53. threaded cylinder; 54. lubrication box; 55. extraction tube; 56. lubrication tube; 57. annular lubrication channel; 58. limit groove; 59. limit strip. DETAILED DESCRIPTION

[0019] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0020] Example: Refer to Figures 1 to 7 , a stamping die for automobile door, comprising: A stamping platform 1, a lower die 11 is fixedly connected to the upper end of the stamping platform 1, an upper die 12 is driven and arranged in a vertical direction just above the lower die 11, and two stamping heads 13 are symmetrically penetrated and rotatably connected to the upper die 12; A stamping speed regulating mechanism 2 is used to regulate the stamping speed of the stamping head 13 according to the temperature of the stamping head 13. The stamping speed regulating mechanism 2 comprises a turntable 21 rotatably connected to the upper end of the stamping platform 1. A servo motor 22 for driving the turntable 21 to rotate is fixedly connected to the bottom wall of the stamping platform 1. A slide groove 23 is provided on the turntable 21. An L-shaped rod 24 is slidably connected in the slide groove 23. An electric push rod for driving the L-shaped rod 24 is provided in the slide groove 23. A temperature sensor is provided inside the stamping head 13. A PLC controller 25 is provided at the upper end of the stamping platform 1. The PLC controller 25 is electrically connected to the temperature sensor and the electric push rod. The PLC controller 25 regulates the extension and retraction amount of the electric push rod according to the temperature data fed back by the temperature sensor. A hydraulic rod 26 is fixedly installed at a position directly above the upper mold 12. A driving component 27 for driving the upper mold 12 and the stamping head 13 to move downward for stamping operation is provided between the L-shaped rod 24 and the hydraulic rod 26.

[0021] Specifically, a guide pillar 14 is fixedly connected to the upper end of the stamping platform 1, and guide blocks 15 slidably mounted on the guide pillars 14 are fixedly connected to the two side walls of the upper mold 12. Through the arrangement of the guide pillars 14 and the guide blocks 15, the upper mold 12 and the punching head 13 can be limited, so that the punching head 13 is more stable when it moves in the vertical direction for stamping operations, thereby improving the stamping effect.

[0022] The driving assembly 27 includes a liquid storage tank 271 fixedly connected to the upper end of the punching platform 1, a liquid pumping cylinder 272 is provided at the upper end of the punching platform 1, a liquid infusion tube 273 is fixedly connected between the liquid storage tank 271 and the liquid pumping cylinder 272, a piston plate 274 is sealingly and slidably connected in the liquid pumping cylinder 272, a stopper 275 is fixedly connected in the liquid pumping cylinder 272, a first spring 276 is provided between the piston plate 274 and the two stoppers 275, and a liquid discharge pipe 277 is fixedly connected between the hydraulic rod 26 and the liquid pumping cylinder 272. A first one-way valve is provided in the infusion tube 273 and the discharge tube 277. An infusion space is formed between the liquid storage tank 271, the pumping cylinder 272, the infusion tube 273, the discharge tube 277 and the hydraulic rod 26. The infusion space is filled with hydraulic oil. An extension rod 278 is fixedly connected to one end of the piston plate 274 close to the L-shaped rod 24. An abutment wheel 279 is rotatably connected to the extension rod 278 close to the L-shaped rod 24. An abutment plate 2710 that abuts against the abutment wheel 279 is fixedly connected to the L-shaped rod 24.

[0023] Specifically, the setting of the first one-way valve ensures that when the piston plate 274 moves back and forth in the pumping cylinder 272, the hydraulic oil in the liquid storage tank 271 can only be transported to the pumping cylinder 272 through the infusion tube 273, and the hydraulic oil in the pumping cylinder 272 can only be discharged into the hydraulic rod 26 through the discharge tube 277, thereby ensuring that the hydraulic rod 26 can drive the punching head 13 to continuously feed and realize the punching operation.

[0024] Specifically, a liquid pump (not shown in the figure) is provided between the hydraulic rod 26 and the liquid storage tank 271. The liquid pump is used to pump the hydraulic oil in the hydraulic rod 26 back into the liquid storage tank 271 after the stamping operation is completed, so as to facilitate the next stamping operation on the car door. The liquid pump is a very common prior art, so it will not be described in detail in this application.

[0025] In view of the problem that the stamping speed cannot be adjusted in real time according to the temperature of the mold in the prior art, which causes the temperature of the mold to rise after a long period of work, thereby accelerating the wear and thermal fatigue of the mold and reducing the life of the mold, the present invention sets a stamping speed adjustment mechanism 2. During the stamping operation, the servo motor 22 drives the turntable 21 to rotate, further driving the L-shaped rod 24 and the abutment plate 2710 on the turntable 21 to perform circular motion, and the abutment plate 2710 periodically abuts and pushes the abutment wheel 279, further driving the piston plate 274 to move periodically inward in the liquid pumping cylinder 272, and under the elastic force of the first spring 276, the piston plate 274 is able to reciprocate, continuously delivering the hydraulic oil in the liquid storage tank 271 to the pumping cylinder 272 through the infusion pipe 273, and further discharging the hydraulic oil in the pumping cylinder 272 to the hydraulic rod 26 through the discharge pipe 277, so that the hydraulic rod 26 continuously moves downward, driving the upper mold 12 and the punch head 13 to move downward, and realizing the punching operation of the automobile panel. During this process, the temperature sensor inside the punch head 13 can transmit the temperature data of the punch head 13 to the PLC controller 25 in real time, and further control the position of the L-shaped rod 24 on the turntable 21 through the PLC controller 25. The change of the position of the L-shaped rod 24 will have the following effects: When the temperature of the punch head 13 is at a high state, the L-shaped rod 24 is located near the inner side of the turntable 21, so that when the abutment plate 2710 on the L-shaped rod 24 periodically contacts the abutment wheel 279, the piston plate 274 moves back and forth in the pumping cylinder 272. The distance of the displacement is small, so that less hydraulic oil is discharged into the hydraulic rod 26 per unit time, so that the stamping speed of the hydraulic rod 26 driving the upper mold 12 and the punch head 13 to move downward is slowed down, so that the temperature of the punch head 13 is too high, which causes excessive wear of the punch head 13, and the service life of the punch head 13 is extended. At the same time, since the punch head 13 contacts the automobile plate during the stamping operation, it can prevent the temperature of the automobile plate from being too high, and avoid excessive deformation of the automobile plate during stamping, thereby improving the stamping effect of the automobile plate. When the temperature of the punch head 13 is at a relatively low level, the L-shaped rod 24 is located close to the outside of the turntable 21, so that the piston plate 274 moves back and forth in the pumping cylinder 272 over a relatively large distance, so that more hydraulic oil is discharged into the hydraulic rod 26 per unit time, thereby increasing the stamping speed of the hydraulic rod 26 driving the upper mold 12 and the punch head 13 to move downward, thereby improving the stamping efficiency.

[0026] A positioning stamping mechanism 3 controlled by a turntable 21 is provided above the stamping platform 1, which is used to clamp and position the automobile door before stamping. The positioning stamping mechanism 3 includes an annular liquid guide frame 31 fixedly connected to the upper end of the stamping platform 1, and the annular liquid guide frame 31 is also filled with hydraulic oil. The annular liquid guide frame 31 is sealed and rotatably connected to the peripheral side wall of the turntable 21. The outer peripheral surface of the turntable 21 is provided with a plurality of centrifugal grooves 32 connected to the annular liquid guide frame 31, and each centrifugal groove 32 is sealed and slidably connected with a piston block 33, and each piston block 33 is elastically connected to the inside of the centrifugal groove 32 with a second spring 34. The annular liquid guide frame 3 1 are fixedly connected with a first liquid guiding channel 35 and a second liquid guiding channel 36 on both sides, and both side ends of the first liquid guiding channel 35 are sealed and slidably connected with a first push rod 37, and the parts of the two first push rods 37 extending outside the first liquid guiding channel 35 are fixedly connected with a clamping plate 38, an automatic pressure relief valve is provided in the second liquid guiding channel 36, and both side ends of the second liquid guiding channel 36 are sealed and slidably connected with a second push rod 39, and the upper end of the stamping platform 1 is slidably connected with a slider 310 in the horizontal direction, and the upper end of the slider 310 is fixedly connected to the bottom wall of the liquid pumping cylinder 272, and the slider 310 is fixedly connected to the two second push rods 39.

[0027] In order to improve the accuracy of the stamping position of the automobile door and the overall work efficiency, the present invention sets a positioning stamping mechanism 3. During the stamping operation, the rotation of the turntable 21 will drive the piston block 33 to slide in the centrifugal groove 32 under the action of centrifugal force, and discharge the hydraulic oil in the centrifugal groove 32 into the annular liquid guide frame 31. The hydraulic oil in the annular liquid guide frame 31 first enters the first liquid guide channel 35, pushing the two first push rods 37 to approach each other, so that the two clamping plates 38 are close to each other, first clamping and positioning the automobile door embryo plate, and then the hydraulic oil in the centrifugal groove 32 continues to be transported to the annular liquid guide frame 31, so that the annular liquid guide frame The liquid pressure in 31 increases and exceeds the critical value of the automatic pressure relief valve, so that the hydraulic oil in the annular liquid guiding frame 31 can enter the second liquid guiding channel 36, driving the two second push rods 39 to move, and then pushing the slider 310 to drive the liquid pumping cylinder 272 to move, so that the liquid pumping cylinder 272 moves to the abutment wheel 279 and the abutment plate 2710 to cooperate with each other, so that the car door can be positioned before the stamping operation to prevent the car door from deviating from the position during the stamping process and ensure the accuracy of the stamping position of the car door. After the positioning is completed, the car door can be stamped immediately, which improves the work continuity and greatly improves the work efficiency.

[0028] Two sets of rotating mechanisms 4 are symmetrically arranged above the upper mold 12, which are used to drive the punch head 13 to rotate while moving downward. The rotating mechanism 4 includes a support block 41 fixedly connected to the upper end of the upper mold 12, and a transmission rod 42 is rotatably connected to the support block 41. The end of the transmission rod 42 and the punch head 13 that are close to each other is provided with a bevel gear 43 that meshes with each other, and the end of the transmission rod 42 that is away from the bevel gear 43 is fixedly connected to a transmission gear 44. The upper end of the stamping platform 1 is fixedly connected to a rack 45 that meshes with the transmission gear 44 in the vertical direction.

[0029] In order to reduce the overall load of the punch head 13 during the punching operation, the present invention sets a rotating mechanism 4. During the punching operation, the upper mold 12 drives the punch head 13 to move downward, which will cause the transmission gear 44 to move vertically along the rack 45, thereby driving the transmission rod 42 to rotate, and further driving the punch head 13 to rotate through two bevel gears 43. The rotational movement of the punch head 13 converts part of the force during the punching operation into rotational inertia, reducing the overall load on the punch head 13 and increasing the service life of the punch head 13. At the same time, it can provide a more stable processing state, reduce the vibration of the car door, and thus improve the processing accuracy and consistency of the car door.

[0030] Two groups of lubrication mechanisms 5 driven by the rotating mechanism 4 are also provided above the upper mold 12, which are used to lubricate the stamping position during the stamping process. The lubrication mechanism 5 includes a screw 51 coaxially fixedly connected to the stamping head 13, and a lubrication cylinder 52 is fixedly installed above the upper mold 12. The inner wall of the lubrication cylinder 52 is sealed and slidably connected with a threaded cylinder 53 in the vertical direction, and the threaded cylinder 53 is threadedly connected to the screw 51. A lubrication box 54 is fixedly installed above the upper mold 12, and an extraction pipe 55 is fixedly connected between the lubrication box 54 and the lubrication cylinder 52. A lubrication pipe 56 is connected on the outer wall of the lubrication cylinder 52, and the lubrication pipe 56 extends to the bottom of the upper mold 12 and is fixedly connected to an annular lubrication channel 57 at its bottom. A second one-way valve is provided in both the extraction pipe 55 and the lubrication pipe 56.

[0031] Specifically, the second one-way valve is set so that when the threaded cylinder 53 slides relative to the lubrication cylinder 52, the lubricating oil in the lubrication box 54 can only be extracted into the lubrication cylinder 52 through the extraction pipe 55, and the lubricating oil in the lubrication cylinder 52 can only be discharged to the annular lubrication channel 57 through the lubrication pipe 56.

[0032] Specifically, the lubrication cylinder 52 and the lubrication box 54 are fixedly connected to the upper end of the upper mold 12 through the second support rod and the third support rod respectively.

[0033] Specifically, the inner walls on both sides of the lubrication cylinder 52 are provided with limiting grooves 58 in the vertical direction, and the outer walls on both sides of the threaded cylinder 53 are fixedly connected with limiting strips 59 that slide in the limiting grooves 58 in a sealing manner. Through the arrangement of the limiting grooves 58 and the limiting strips 59, when the screw 51 rotates, the threaded cylinder 53 can only slide in the vertical direction on the inner wall of the lubrication cylinder 52, thereby preventing the screw 51 from driving the threaded cylinder 53 to rotate, and ensuring that the threaded cylinder 53 can slide in the vertical direction relative to the lubrication cylinder 52 to suck and discharge the lubricating oil.

[0034] In order to reduce energy consumption during the stamping process and improve processing efficiency, the present invention sets a lubrication mechanism 5. During the stamping operation, the rotational movement of the punch head 13 will drive the screw 51 to rotate, and then drive the threaded barrel 53 to move upward in the vertical direction inside the lubrication barrel 52, and the lubricating oil in the lubrication barrel 52 is discharged into the annular lubrication channel 57 through the lubrication pipe 56. The lubricating oil can slide downward along the peripheral side wall of the punch head 13 through the annular lubrication channel 57. During the stamping operation, lubrication is performed between the punch head 13 and the car door, thereby reducing friction, reducing energy consumption during the stamping process, and improving processing efficiency. At the same time, it can reduce burrs and scratches generated during the stamping process, thereby improving the surface quality of the final product. After the stamping operation is completed, the upper mold 12 moves up and returns to the initial position, driving the screw 51 to rotate in the opposite direction, so that the threaded barrel 53 moves downward in the lubrication barrel 52, and the lubricating oil in the lubrication box 54 is pumped into the lubrication barrel 52 through the extraction pipe 55, which is convenient for lubrication of the next stamping operation.

[0035] The present invention can be explained by the following operation mode: Before the stamping operation, the servo motor 22 drives the turntable 21 to rotate, and the piston block 33 is driven to slide in the centrifugal groove 32 under the action of centrifugal force, and the hydraulic oil in the centrifugal groove 32 is discharged into the annular liquid guide frame 31. The hydraulic oil in the annular liquid guide frame 31 first enters the first liquid guide channel 35, pushing the two first push rods 37 to approach each other, so that the two clamping plates 38 are close to each other, and the car door is clamped and positioned; After the clamping positioning is completed, the hydraulic oil in the centrifugal groove 32 continues to be transported to the annular liquid guide frame 31, which will increase the liquid pressure in the annular liquid guide frame 31 and exceed the critical value of the automatic pressure relief valve, so that the hydraulic oil in the annular liquid guide frame 31 can enter the second liquid guide channel 36, drive the two second push rods 39 to move, and then push the slider 310 to drive the liquid pumping cylinder 272 to move, so that the liquid pumping cylinder 272 moves to the abutment wheel 279 and the abutment plate 2710 to cooperate with each other. At this time, the rotation of the turntable 21 will periodically contact the abutment wheel 279 through the abutment plate 2710. 79 abuts against and pushes, further driving the piston plate 274 to periodically move inward in the pumping cylinder 272, and under the elastic force of the first spring 276, the piston plate 274 is able to reciprocate, continuously delivering the hydraulic oil in the liquid storage tank 271 to the pumping cylinder 272 through the infusion pipe 273, and further discharging the hydraulic oil in the pumping cylinder 272 to the hydraulic rod 26 through the discharge pipe 277, so that the hydraulic rod 26 continuously moves downward, driving the upper mold 12 and the punch head 13 to move downward, and realizing the stamping operation of the automobile panel; During the stamping operation, the temperature sensor inside the punch head 13 can transmit the temperature data of the punch head 13 to the PLC controller 25 in real time, and further control the position of the L-shaped rod 24 on the turntable 21 through the PLC controller 25. When the temperature of the punch head 13 is at a high state, the L-shaped rod 24 is located near the inner side of the turntable 21, so that when the abutment plate 2710 on the L-shaped rod 24 periodically contacts the abutment wheel 279, the piston plate 274 moves back and forth in the pumping cylinder 272. The distance is small, so that the liquid discharged to the hydraulic rod per unit time is small. The hydraulic oil in 26 is less, so that the stamping speed of the hydraulic rod 26 driving the upper mold 12 and the punch head 13 to move downward is slowed down, so as to avoid excessive wear of the punch head 13 due to excessive temperature of the punch head 13. When the temperature of the punch head 13 is at a low state, the L-shaped rod 24 is located near the outer side of the turntable 21, so that the piston plate 274 moves back and forth in the pumping cylinder 272. The distance of the displacement is large, so that more hydraulic oil is discharged into the hydraulic rod 26 per unit time, and the stamping speed of the hydraulic rod 26 driving the upper mold 12 and the punch head 13 to move downward is increased, thereby improving the stamping efficiency; The upper die 12 drives the punch head 13 to move downward, which causes the transmission gear 44 to move vertically along the rack 45, thereby driving the transmission rod 42 to rotate, and further driving the punch head 13 to rotate through the two bevel gears 43. The rotational motion of the punch head 13 converts part of the force during punching into rotational inertia. The rotational movement of the punch head 13 will drive the screw 51 to rotate, and then drive the threaded barrel 53 to move upward in the vertical direction inside the lubrication barrel 52, and discharge the lubricating oil in the lubrication barrel 52 into the annular lubrication channel 57 through the lubrication pipe 56. The lubricating oil can slide downward along the peripheral side wall of the punch head 13 through the annular lubrication channel 57, so as to lubricate the space between the punch head 13 and the car door during the punching operation.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stamping die for automobile door, characterized in that: include: A stamping platform (1), wherein a lower die (11) is fixedly connected to the upper end of the stamping platform (1), an upper die (12) is arranged directly above the lower die (11) in a vertically drivable manner, and two stamping heads (13) are symmetrically penetrated and rotatably connected to the upper die (12); A stamping speed regulating mechanism (2) is used to regulate the stamping speed of the stamping head (13) according to the temperature of the stamping head (13), the stamping speed regulating mechanism (2) comprising a turntable (21) rotatably connected to the upper end of the stamping platform (1), a servo motor (22) for driving the turntable (21) to rotate is fixedly connected to the bottom wall of the stamping platform (1), a slide groove (23) is provided on the turntable (21), an L-shaped rod (24) is slidably connected in the slide groove (23), an electric push rod for driving the L-shaped rod (24) is provided in the slide groove (23), and the stamping head (13) is provided with a temperature sensor inside, a PLC controller (25) is provided at the upper end of the stamping platform (1), the PLC controller (25) is electrically connected to the temperature sensor and the electric push rod, and the PLC controller (25) adjusts the extension and contraction amount of the electric push rod according to the temperature data fed back by the temperature sensor, a hydraulic rod (26) is fixedly installed at a position directly above the upper mold (12), and a driving component (27) for driving the upper mold (12) and the punch head (13) to move downward for stamping operation is provided between the L-shaped rod (24) and the hydraulic rod (26).

2. The automobile door stamping die according to claim 1, characterized in that: The upper end of the punching platform (1) is fixedly connected to a guide pillar (14), and both side walls of the upper mold (12) are fixedly connected to guide blocks (15) slidably sleeved on the guide pillar (14).

3. The automobile door stamping die according to claim 1, characterized in that: The driving assembly (27) comprises a liquid storage box (271) fixedly connected to the upper end of the punching platform (1); a liquid pumping cylinder (272) is provided at the upper end of the punching platform (1); a liquid infusion tube (273) is fixedly connected between the liquid storage box (271) and the liquid pumping cylinder (272); a piston plate (274) is sealingly and slidably connected inside the liquid pumping cylinder (272); a stopper (275) is fixedly connected inside the liquid pumping cylinder (272); a first spring (276) is provided between the piston plate (274) and the two stoppers (275); a liquid discharge tube (273) is fixedly connected between the hydraulic rod (26) and the liquid pumping cylinder (272); 7), a first one-way valve is provided in each of the infusion tube (273) and the drainage tube (277); an infusion space is formed between the liquid storage tank (271), the liquid pumping cylinder (272), the infusion tube (273), the drainage tube (277) and the hydraulic rod (26); the infusion space is filled with hydraulic oil; an end of the piston plate (274) close to the L-shaped rod (24) is fixedly connected to an extension rod (278); an end of the extension rod (278) close to the L-shaped rod (24) is rotatably connected to an abutment wheel (279); and an abutment plate (2710) abutting against the abutment wheel (279) is fixedly connected to the L-shaped rod (24).

4. The automobile door stamping die according to claim 3, characterized in that: A liquid pump is provided between the hydraulic rod (26) and the liquid storage tank (271), and the liquid pump is used to pump the hydraulic oil in the hydraulic rod (26) back into the liquid storage tank (271) after the punching operation is completed.

5. The automobile door stamping die according to claim 3, characterized in that: A positioning punching mechanism (3) controlled by a turntable (21) is provided above the punching platform (1) and is used to clamp and position the automobile door before punching. The positioning punching mechanism (3) comprises an annular liquid guide frame (31) fixedly connected to the upper end of the punching platform (1). The annular liquid guide frame (31) is also filled with hydraulic oil. The annular liquid guide frame (31) is sealingly rotatably connected to the peripheral side wall of the turntable (21). The outer peripheral surface of the turntable (21) is provided with a plurality of centrifugal grooves (32) connected to the annular liquid guide frame (31). A piston block (33) is sealingly slidably connected to each centrifugal groove (32). A second spring (34) is elastically connected between each piston block (33) and the inside of the centrifugal groove (32). The annular liquid guide frame The two sides of the punching platform (31) are respectively fixedly connected with a first liquid guiding channel (35) and a second liquid guiding channel (36); the two side ends of the first liquid guiding channel (35) are sealed and slidably connected with a first push rod (37); the two parts of the first push rods (37) extending outside the first liquid guiding channel (35) are fixedly connected with a clamping plate (38); an automatic pressure relief valve is provided in the second liquid guiding channel (36); the two side ends of the second liquid guiding channel (36) are sealed and slidably connected with a second push rod (39); the upper end of the punching platform (1) is slidably connected with a slider (310) in a horizontal direction; the upper end of the slider (310) is fixedly connected to the bottom wall of the liquid pumping cylinder (272); and the slider (310) is fixedly connected to the two second push rods (39).

6. The automobile door stamping die according to claim 1, characterized in that: Two groups of rotating mechanisms (4) are symmetrically arranged above the upper die (12) for driving the punch head (13) to rotate while moving downward, the rotating mechanism (4) comprising a support block (41) fixedly connected to the upper end of the upper die (12), a transmission rod (42) passing through the support block (41) and rotatably connected thereto, a bevel gear (43) meshing with each other is arranged at one end of the transmission rod (42) and the punch head (13) close to each other, a transmission gear (44) is fixedly connected at one end of the transmission rod (42) away from the bevel gear (43), and a rack (45) meshing with the transmission gear (44) is fixedly connected to the upper end of the punching platform (1) in a vertical direction.

7. The automobile door stamping die according to claim 6, characterized in that: Two groups of lubrication mechanisms (5) driven by the rotating mechanism (4) are also provided above the upper die (12) for lubricating the punching position during the punching process. The lubrication mechanism (5) comprises a screw (51) coaxially fixedly connected to the punch head (13). A lubrication cylinder (52) is fixedly installed above the upper die (12). The inner wall of the lubrication cylinder (52) is sealed and slidably connected to a threaded cylinder (53) in a vertical direction. The threaded cylinder (53) is threadedly connected to the screw (51). A lubrication box (54) is fixedly installed above the upper die (12). An extraction pipe (55) is fixedly connected between the lubrication box (54) and the lubrication cylinder (52). A lubrication pipe (56) is connected to the outer wall of the lubrication cylinder (52). The lubrication pipe (56) extends to the bottom of the upper die (12) and is fixedly connected to an annular lubrication channel (57) at its bottom. Second one-way valves are provided in both the extraction pipe (55) and the lubrication pipe (56).

8. The automobile door stamping die according to claim 7, characterized in that: Limiting grooves (58) are formed on both inner walls of the lubricating cylinder (52) in a vertical direction, and limiting strips (59) are fixedly connected to both outer walls of the threaded cylinder (53) and are sealingly slidable in the limiting grooves (58).

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