Automatic locking device for stamping die

Abstract

The invention relates to an automatic locking device for a stamping die, which comprises a workbench, a lower die arranged on the workbench and an upper die arranged on the lower die, a locking part is arranged on the lower die, at least one locking mechanism is arranged on two symmetrical sides of the workbench, and guide rods are arranged on the upper die corresponding to the locking mechanisms. And the guide rod is inserted into the locking mechanism to drive the locking mechanism to act, so that the locking mechanism is matched with the locking part to automatically lock the lower die. During operation, the lower die can be directly placed on the workbench, and when the upper die gradually gets close to the lower die, the guide rod on the upper die gets close to and is inserted into the locking mechanism on the lower die, so that the locking mechanism acts to be automatically matched and locked with the locking part on the upper die, and the upper die and the lower die as well as the lower die and the workbench can be fixed; the working table and the upper die are fixed without manually turning screws, the upper die and the lower die are fixed, the operation steps are simple, labor is saved, time and labor are saved, and the working efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of die fixing, in particular to an automatic locking device for a stamping die. Background Art

[0002] A stamping die is a special process equipment that processes materials (metal or non-metal) into parts (or semi-finished products) in cold stamping processing, and is called a cold stamping die (commonly known as a cold punching die). Stamping is a metal processing method that applies pressure to materials using a die installed on a press at room temperature to cause separation or plastic deformation, thereby obtaining the required parts.

[0003] In the prior art, the dies used in the production of automotive parts generally do not have a locking device, or the bottom die is locked and fixed to the operating table by screws, etc. When the bottom die is fixed, the position of the bottom die needs to be adjusted so that the threaded holes on the bottom die correspond to the threads on the operating table, so as to screw the screws into the threaded holes for fixing later. The operation is relatively cumbersome and time-consuming. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic locking device for a stamping die, which does not require manual screwing by workers, has simple operation steps, and saves labor.

[0005] To solve the above technical problem, the present invention is realized through the following technical solutions:

[0006] An automatic locking device for a stamping die includes a workbench, a lower die arranged on the workbench, and an upper die arranged on the lower die. A locking part is arranged on the lower die, at least one locking mechanism is arranged on two symmetric sides of the workbench, a guide rod is arranged on the upper die corresponding to the locking mechanism. When the upper die approaches the lower die during stamping, the guide rod is inserted into the locking mechanism to drive the locking mechanism to act, so that the locking mechanism cooperates with the locking part to automatically lock the lower die.

[0007] Preferably, the locking mechanism includes a mounting seat, a transmission rod, a driving rod, a driving shaft and a screw rod arranged on the mounting seat. A worm part is arranged on the driving shaft, a worm wheel part is in threaded cooperation with the screw rod. The driving rod drives the driving shaft to rotate, the driving shaft rotates to drive the worm part to make a rotational motion, and the rotational motion of the worm part drives the worm wheel part to drive the screw rod to make a lifting motion to cooperate with the locking part for locking.

[0008] Preferably, a first protrusion is arranged at one end of the transmission rod, a second protrusion is arranged at the other end of the transmission rod, a wedge part is arranged on the guide rod, and an abutting groove is arranged on the mounting seat. The wedge part is inserted into the abutting groove to push the first protrusion out of the abutting groove.

[0009] Preferably, the mounting base is provided with a mounting hole, the driving rod is movably arranged in the mounting hole and one end thereof extends out of the mounting hole, a spring is sleeved on the other end of the driving rod, the driving rod is limited in the mounting hole through the spring, and the second protrusion cooperates with the driving rod to move along the axial direction of the mounting hole.

[0010] Preferably, a driving motor is connected to one end of the driving shaft close to the transmission rod, a proximity switch is arranged on the driving motor, and when the transmission rod approaches the driving motor, the proximity switch triggers the driving motor to work.

[0011] Preferably, the middle part of the transmission rod is rotatably arranged on the bracket through a rotating shaft, a torsion spring for limiting the transmission rod is sleeved on the rotating shaft, in the initial state, the first protrusion of the transmission rod abuts against the abutting groove, and in the locked state, the wedge part is inserted into the abutting groove to push the first protrusion out of the abutting groove.

[0012] Preferably, a titanium nitride coating is arranged on the mating surface of the abutting groove, and the thickness of the titanium nitride coating is 3-5 μm.

[0013] Preferably, the locking part includes a through hole arranged on the lower die and a nut fixedly arranged at the top of the through hole, and the screw rod movably penetrates through the through hole and cooperates with the nut to lock the upper die.

[0014] Preferably, automatic clamping mechanisms for clamping the lower die and pneumatic boosting mechanisms for driving the automatic clamping mechanisms are arranged on the other two symmetrical sides of the workbench, the pneumatic boosting mechanisms include integrated micro hydraulic cylinders and accumulators connected to the integrated micro hydraulic cylinders.

[0015] Preferably, the automatic clamping mechanism includes wedge-shaped clamping blocks, and the wedge-shaped clamping blocks are hardened wedge-shaped blocks with a self-locking angle of 12°.

[0016] In summary, the advantages of the present invention are as follows:

[0017] During the operation of the present invention, the lower die can be directly placed on the workbench, the position of the lower die is adjusted to align the locking part with the locking mechanism, and then the upper die is placed on the lower die. During stamping, when the upper die gradually approaches the lower die, the guide rod on the upper die approaches and inserts into the locking mechanism on the lower die, so that the locking mechanism acts to automatically cooperate with the locking part on the upper die to lock, thereby realizing the fixation of the upper die and the lower die, and the fixation of the lower die and the workbench. There is no need to manually screw the workbench and the upper die, and the upper die and the lower die, the operation steps are simple, labor is saved, time and effort are saved, and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1Schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 Schematic structural diagram of the unlocking state of the locking mechanism in an embodiment of the present invention;

[0021] Figure 3 Schematic structural diagram of the locking state of the locking mechanism in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the cooperation between the locking mechanism and the locking portion in an embodiment of the present invention;

[0023] Figure 5 is Figure 4 Schematic cross-sectional view in the A-A direction of

[0024] Figure 6 Schematic structure of the driving rod in an embodiment of the present invention Figure 1 ;

[0025] Figure 7 Schematic structure of the driving rod in an embodiment of the present invention Figure 2 .

[0026] Reference numerals:

[0027] 1, workbench; 2, lower die; 3, upper die; 4, locking portion; 41, through hole; 42, nut; 5, locking mechanism; 51, mounting seat; 511, abutting groove; 512, mounting hole; 52, transmission rod; 521, first protrusion; 522, second protrusion; 523, rotating shaft; 524, bracket; 525, torsion spring; 53, driving rod; 531, limiting groove; 54, driving shaft; 541, worm portion; 542, first bearing; 55, screw; 551, worm gear portion; 552, second bearing; 56, spring; 57, driving motor; 58, proximity switch; 59, limit pin; 6, guide rod; 61, wedge portion; 7, automatic clamping mechanism; 8, pneumatic boosting mechanism. Detailed implementation manners

[0028] In order to more clearly illustrate the overall concept of the present invention, the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", "longitudinal", "transverse", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] Embodiment

[0030] An automatic locking device for a stamping die, as Figures 1 to 7 shown, comprising a workbench 1, a lower die 2 disposed on the workbench 1, and an upper die 3 disposed on the lower die 2. A locking portion 4 is provided on the lower die 2. At least one locking mechanism 5 is provided on two symmetric sides of the workbench 1. A guide rod 6 is provided on the upper die 3 corresponding to the locking mechanism 5. When the upper die 3 approaches the lower die 2 during stamping, the guide rod 6 is inserted into the locking mechanism 5 to drive the locking mechanism 5 to act, so that the locking mechanism 5 cooperates with the locking portion 4 to automatically lock the lower die 2.

[0031] During the operation of the present invention, the lower die 2 can be directly placed on the workbench 1, the position of the lower die 2 is adjusted to align the locking portion 4 with the locking mechanism 5, and then the upper die 3 is placed on the lower die 2. During stamping, when the upper die 3 gradually approaches the lower die 2, the guide rod 6 on the upper die 3 approaches and is inserted into the locking mechanism 5 on the lower die 2, so that the locking mechanism 5 acts to cooperate with the locking portion 4 on the upper die 3 to lock, thereby realizing the fixation of the upper die 3 and the lower die 2, as well as the fixation of the lower die 2 and the workbench 1. There is no need to manually screw the workbench 1 and the upper die 3 to fix, and the upper die 3 and the lower die 2 to fix. The operation steps are simple, labor is saved, time and effort are saved, and the work efficiency is high.

[0032] In order to facilitate the cooperation between the guide rod 6 and the locking mechanism 5, a wedge portion 61 is provided on the guide rod 6, and the wedge portion 61 is provided on the end face of the guide rod 6 facing the lower die 2.

[0033] In order to facilitate installation and fixation, the locking mechanism 5 includes a mounting seat 51, a transmission rod 52, a driving rod 53, a driving shaft 54 and a screw 55 provided on the mounting seat 51. Among them, the middle of the transmission rod 52 is rotatably provided on a bracket 524 through a rotating shaft 523. One end of the transmission rod 52 is provided with a first protrusion 521, and the other end of the transmission rod 52 is provided with a second protrusion 522. An abutting groove 511 is provided on the mounting seat 51. When the upper die 3 approaches the lower die 2, the wedge portion 61 on the end face of the guide rod 6 is inserted into the abutting groove 511 to push the first protrusion 521 out of the abutting groove 511.

[0034] In order to limit the transmission rod 52, a torsion spring 525 that limits the transmission rod 52 is sleeved on the rotating shaft 523. In the unlocking state, the first protrusion 521 of the transmission rod 52 abuts against the abutting groove 511. At this time, the wedge portion 61 is away from the first protrusion 521, and the wedge portion 61 has no acting force on the first protrusion 521, and the torsion spring 525 is in a free state; in the locked state, the wedge portion 61 is inserted into the abutting groove 511 to push the first protrusion 521 out of the abutting groove 511, and the torsion spring 525 is in a loaded state. At this time, the wedge portion 61 acts on the first protrusion 521 to make the transmission rod 52 rotate and act on the torsion spring 525, and the torsion spring 525 is compressed and deformed by the acting force of the transmission rod 52.

[0035] To achieve the automatic lifting of the screw rod 55, both ends of the drive shaft 54 are arranged on the first bearing 542. A worm part 541 is provided on the drive shaft 54. The screw rod 55 is arranged on the second bearing 552. A worm gear part 551 is in threaded fit with the screw rod 55. The drive rod 53 acts to drive the drive shaft 54 to rotate. The rotation of the drive shaft 54 drives the worm part 541 to perform a rotational motion. The rotational motion of the worm part 541 is transmitted to the worm gear part 551 and drives the screw rod 55 to perform a lifting motion to cooperate with the locking part 4 for locking.

[0036] It can be understood that the axial direction of the screw rod 55 intersects with the axial direction of the drive shaft 54 in space, so that the direction of the rotational motion of the drive shaft 54 and the direction of the lifting motion of the screw rod 55 are not in the same plane. The multi-directional transmission is realized by the staggered transmission of the drive shaft 54 and the screw rod 55 and the staggered transmission of the worm part 541 and the worm gear part 551 thereon.

[0037] To facilitate assembly, an installation hole 512 is provided in the mounting seat 51. The drive rod 53 is movably arranged in the installation hole 512 and one end extends out of the installation hole 512. A spring 56 is sleeved on the other end of the drive rod 53. The drive rod 53 is limited in the installation hole 512 through the spring 56. The second protrusion 522 cooperates with the drive rod 53 to move axially along the installation hole 512.

[0038] To facilitate limiting, a limiting groove 531 is axially arranged on the drive rod 53. A limiting pin 59 is arranged in the limiting groove 531. The limiting pin 59 is fixedly arranged on the mounting seat 51. The drive rod 53 can move axially along the installation hole 512 under the guiding and limiting action of the limiting pin 59. The spring 56 compresses or stretches axially along the installation hole 512 and is limited by the limiting pin 59.

[0039] To facilitate the quick driving of the drive shaft 54 to work, a drive motor 57 is connected to one end of the drive shaft 54 close to the transmission rod 52. A proximity switch 58 is provided on the drive motor 57. When the transmission rod 52 approaches the drive motor 57, the proximity switch 58 senses the proximity signal and triggers the drive motor 57 to work.

[0040] To increase the hardness of the abutting groove 511 and thus reduce wear, a titanium plating layer is provided on the mating surface of the abutting groove 511. Preferably, the thickness of the titanium plating layer is 3-5 μm. When the thickness of the titanium plating layer is less than 3 μm, its corrosion resistance and wear resistance are too poor to play a wear-resistant role for the abutting groove 511. When the thickness of the titanium plating layer is greater than 5 μm, it may cause relatively large stress inside the titanium plating layer. When this stress exceeds the capacity of the titanium plating layer itself, the titanium plating layer will fall off from the abutting groove, and it also increases the production cost, which is not conducive to production efficiency and environmental protection. The titanium plating layer can significantly increase the hardness of the surface of the abutting groove 511, thereby enhancing the wear resistance of the surface of the abutting groove 511. Moreover, the titanium plating layer has good heat resistance and corrosion resistance, thus effectively reducing the wear of the abutting groove 511 and extending the service life of the mounting seat 51.

[0041] In this embodiment, the locking part 4 includes a through hole 41 provided on the lower die 2, and a nut 42 fixedly provided at the top of the through hole 41. The screw rod 55 is movably inserted through the through hole 41 and cooperates with the nut 42 to lock the upper die 3.

[0042] To further fix the workbench 1 and the injection mold, automatic clamping mechanisms 7 for clamping the lower die 2 are provided on the other two symmetrical sides of the workbench 1, and a pneumatic boosting mechanism 8 for driving the automatic clamping mechanisms 7. The pneumatic boosting mechanism 8 includes an integrated micro hydraulic cylinder and an accumulator connected to the integrated micro hydraulic cylinder. The integrated micro hydraulic cylinder is small in size and can work efficiently in a compact and limited space. Compared with traditional large hydraulic systems, the integrated micro hydraulic cylinder is more energy-efficient, requires a smaller volume of liquid, can reduce energy consumption, and helps reduce the impact on the environment. During intermittent work or periodic actions, the accumulator can store the excess pressure oil output by the pump. Energy recovery can improve energy utilization efficiency and is an important way to save energy. When the system needs it, it is released by the accumulator. This can reduce the rated flow rate of the hydraulic pump, thereby reducing the power consumption of the motor and also lowering the temperature rise of the system. To further improve the clamping effect, the automatic clamping mechanism 7 includes a wedge-shaped clamping block. Preferably, the wedge-shaped clamping block is a hardened wedge-shaped block with a self-locking angle of 12°. The design principle of the inclined surface of the wedge-shaped clamping block mainly uses the force applied by the inclined surface to disperse a larger force to a smaller area, thereby generating a larger vertical force. This design can achieve a larger clamping force with a smaller force because when the wedge-shaped block is subjected to a force perpendicular to the inclined surface direction, it will slide along the inclined surface to both sides, thereby generating a huge lateral clamping force to effectively clamp the lower die 2.

[0043] It can be understood that, for the convenience of intuitive feedback of the working state, the automatic clamping mechanism 7 further includes a tactile feedback device, which gives a vibration prompt through the tactile feedback device when the automatic clamping mechanism 7 is locked in place.

[0044] In addition to the above preferred embodiments, there are other implementation manners of the present invention. Those skilled in the art can make various changes and deformations according to the present invention. As long as they do not depart from the spirit of the present invention, they shall fall within the scope defined by the appended claims of the present invention.

Claims

1. An automatic locking device for a stamping die, characterized in that: It includes a workbench, a lower die arranged on the workbench, and an upper die arranged on the lower die. A locking portion is provided on the lower die. At least one locking mechanism is provided on two symmetric sides of the workbench. A guide rod is provided on the upper die corresponding to the locking mechanism. When the upper die approaches the lower die during stamping, the guide rod is inserted into the locking mechanism to drive the locking mechanism to act, so that the locking mechanism cooperates with the locking portion to automatically lock the lower die.

2. The automatic locking device for a stamping die according to claim 1, wherein: The locking mechanism includes a mounting seat, a transmission rod, a driving rod, a driving shaft and a screw rod arranged on the mounting seat. A worm portion is provided on the driving shaft. A worm gear portion is in threaded cooperation with the screw rod. The driving rod drives the driving shaft to rotate. The rotation of the driving shaft drives the worm portion to make a rotational motion. The rotational motion of the worm portion drives the worm gear portion to drive the screw rod to make a lifting motion to cooperate with the locking portion for locking.

3. The automatic locking device for a stamping die according to claim 2, characterized in that: A first protrusion is provided at one end of the transmission rod, and a second protrusion is provided at the other end of the transmission rod. A wedge portion is provided on the guide rod. An abutting groove is provided on the mounting seat. The wedge portion is inserted into the abutting groove to push the first protrusion out of the abutting groove.

4. The automatic locking device for a stamping die according to claim 3, wherein: A mounting hole is provided in the mounting seat. The driving rod is movably arranged in the mounting hole and one end thereof extends out of the mounting hole. A spring is sleeved on the other end of the driving rod. The driving rod is limited in the mounting hole by the spring. The second protrusion cooperates with the driving rod to move along the axial direction of the mounting hole.

5. The automatic locking device for a stamping die according to claim 2, wherein: A driving motor is connected to one end of the driving shaft close to the transmission rod. A proximity switch is provided on the driving motor. When the transmission rod approaches the driving motor, the proximity switch triggers the driving motor to work.

6. The automatic locking device for a stamping die according to claim 5, characterized in that: The middle of the transmission rod is rotatably arranged on the bracket through a rotating shaft. A torsion spring for limiting the transmission rod is sleeved on the rotating shaft. In the initial state, the first protrusion of the transmission rod abuts against the abutting groove. In the locked state, the wedge portion is inserted into the abutting groove to push the first protrusion out of the abutting groove.

7. The automatic locking device for a stamping die according to claim 6, characterized in that: A titanium plating layer is provided on the mating surface of the abutting groove, and the thickness of the titanium plating layer is 3 - 5 μm.

8. The automatic locking device for a stamping die according to claim 1, wherein: The locking portion includes a through hole provided on the lower die, and a nut fixedly provided at the top of the through hole. The screw rod movably passes through the through hole and cooperates with the nut to lock the upper die.

9. The automatic locking device for a stamping die according to claim 1, wherein: Automatic clamping mechanisms for clamping the lower die are provided on the other two symmetric sides of the workbench, and a pneumatic assist mechanism for driving the automatic clamping mechanisms. The pneumatic assist mechanism includes an integrated micro hydraulic cylinder and an accumulator connected to the integrated micro hydraulic cylinder.

10. The automatic locking device for a stamping die according to claim 9, wherein: The automatic clamping mechanism includes a wedge-shaped clamping block, and the wedge-shaped clamping block is a hardened wedge block with a self-locking angle of 12°.

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