An automatic locking device for stamping dies

Abstract

This invention relates to an automatic locking device for stamping dies, comprising a worktable, a lower die disposed on the worktable, and an upper die disposed on the lower die. The lower die is provided with a locking part, and at least one locking mechanism is provided on each of the two symmetrical sides of the worktable. A guide rod is provided on the upper die corresponding to the locking mechanism. During stamping, when the upper die approaches the lower die, the guide rod inserts into the locking mechanism, driving the locking mechanism to automatically lock the lower die by engaging with the locking part. In operation, the lower die can be directly placed on the worktable. As 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, causing the locking mechanism to automatically engage with the locking part on the upper die to lock it in place. This achieves the fixation of the upper and lower dies, and the lower die to the worktable, eliminating the need for manual screwing to fix the worktable and the upper die. The operation is simple, labor-saving, time-saving, and highly efficient.

Description

Technical Field

[0001] This invention relates to the field of mold fixing technology, and in particular to an automatic locking device for stamping dies. Background Technology

[0002] Stamping dies are special process equipment used in cold stamping to process materials (metal or non-metal) into parts (or semi-finished products). They are called cold stamping dies (commonly known as cold stamping dies). Stamping is a pressure processing method that uses dies mounted on a press to apply pressure to materials at room temperature, causing them to separate or plastically deform, thereby obtaining the desired parts.

[0003] In the existing technology, the molds used for producing automotive parts generally do not have locking devices, or the bottom mold is locked and fixed to the operating table by screws or the like. When the bottom mold is fixed, it is also necessary to adjust the position of the bottom mold so that the threaded hole on the bottom mold corresponds to the thread on the operating table so that the screw can be screwed into the threaded hole for fixation. The operation is cumbersome, time-consuming and labor-intensive. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic locking device for stamping dies, which eliminates the need for manual screw tightening, simplifies the operation, and saves labor.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] An automatic locking device for stamping dies includes a worktable, a lower die disposed on the worktable, and an upper die disposed on the lower die. The lower die is provided with a locking part, and at least one locking mechanism is provided on both symmetrical sides of the worktable. The upper die corresponding to the locking mechanism is provided with a guide rod. During stamping, when the upper die approaches the lower die, the guide rod inserts 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 base, a transmission rod, a drive rod, a drive shaft, and a screw disposed on the mounting base. The drive shaft is provided with a worm gear portion, and the screw is threadedly fitted with a worm wheel portion. The drive rod drives the drive shaft to rotate, and the rotation of the drive shaft causes the worm gear portion to rotate. The rotation of the worm gear portion and the worm wheel portion drive the screw to move up and down, which cooperates with the locking portion to lock.

[0008] Preferably, one end of the transmission rod is provided with a first protrusion, the other end of the transmission rod is provided with a second protrusion, the guide rod is provided with a wedge-shaped part, and the mounting base is provided with an abutment groove. The wedge-shaped part is inserted into the abutment groove to push the first protrusion out of the abutment groove.

[0009] Preferably, the mounting base has a mounting hole, the drive rod is movably disposed in the mounting hole with one end protruding out of the mounting hole, the other end of the drive rod is fitted with a spring, the drive rod is limited in the mounting hole by the spring, and the second protrusion cooperates with the drive rod to move axially along the mounting hole.

[0010] Preferably, a drive motor is connected to one end of the drive shaft near the transmission rod, and a proximity switch is provided on the drive motor. When the transmission rod approaches the drive motor, the proximity switch triggers the drive motor to work.

[0011] Preferably, the middle part of the transmission rod is rotatably mounted on the bracket via a rotating shaft. A torsion spring is sleeved on the rotating shaft to limit the movement of the transmission rod. In the initial state, the first protrusion of the transmission rod abuts against the abutment groove. In the locked state, the wedge-shaped part inserts into the abutment groove to push the first protrusion out of the abutment groove.

[0012] Preferably, the mating surface of the abutment groove is provided with a titanium plating layer, the thickness of which is 3-5 μm.

[0013] Preferably, the locking part includes a through hole on the lower mold and a nut fixedly disposed at the top of the through hole, wherein the screw is movably inserted in the through hole and cooperates with the nut to lock the upper mold.

[0014] Preferably, the worktable is provided with an automatic clamping mechanism for clamping the lower die on the other two symmetrical sides, and a pneumatic assist mechanism for driving the automatic clamping mechanism. The pneumatic assist mechanism includes an integrated micro hydraulic cylinder and an accumulator connected to the integrated micro hydraulic cylinder.

[0015] Preferably, the automatic clamping mechanism includes a wedge-shaped clamping block, which is a hardened wedge with a 12° self-locking angle.

[0016] In summary, the advantages of this invention are:

[0017] During operation, the lower die can be placed directly on the worktable, and its position adjusted so that the locking part is aligned with the locking mechanism. Then, the upper die is placed on the lower die. During stamping, as 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, causing the locking mechanism to automatically engage with the locking part on the upper die to lock. This achieves the fixation of the upper and lower dies, as well as the fixation of the lower die to the worktable. There is no need to manually tighten screws to fix the worktable to the upper die or the upper and lower dies. The operation steps are simple, save labor, time and effort, and have high work efficiency. Attached Figure Description

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

[0019] Figure 1This is a schematic diagram of the structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the locking mechanism in the unlocked state in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the locking mechanism in the locked state in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the locking mechanism and the locking part cooperating in an embodiment of the present invention;

[0023] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0024] Figure 6 This is a schematic diagram of the drive rod structure in an embodiment of the present invention. Figure 1 ;

[0025] Figure 7 This is a schematic diagram of the drive rod structure in an embodiment of the present invention. Figure 2 .

[0026] Figure label:

[0027] 1. Worktable; 2. Lower mold; 3. Upper mold; 4. Locking part; 41. Through hole; 42. Nut; 5. Locking mechanism; 51. Mounting base; 511. Abutment groove; 512. Mounting hole; 52. Transmission rod; 521. First protrusion; 522. Second protrusion; 523. Rotating shaft; 524. Bracket; 525. Torsion spring; 53. Drive rod; 531. Limiting groove; 54. Drive shaft; 541. Worm gear part; 542. First bearing; 55. Screw; 551. Worm wheel part; 552. Second bearing; 56. Spring; 57. Drive motor; 58. Proximity switch; 59. Limiting pin; 6. Guide rod; 61. Wedge-shaped part; 7. Automatic clamping mechanism; 8. Pneumatic assist mechanism. Detailed Implementation

[0028] To more clearly illustrate the overall concept of the present invention, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationships, are based solely on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0029] Example

[0030] An automatic locking device for stamping dies, such as Figures 1 to 7 As shown, it includes a worktable 1, a lower die 2 disposed on the worktable 1, and an upper die 3 disposed on the lower die 2. The lower die 2 is provided with a locking part 4. At least one locking mechanism 5 is provided on both symmetrical sides of the worktable 1. The upper die 3 corresponding to the locking mechanism 5 is provided with a guide rod 6. 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 part 4 to automatically lock the lower die 2.

[0031] During operation, the lower die 2 can be placed directly on the workbench 1, and its position adjusted so that the locking part 4 aligns with the locking mechanism 5. Then, the upper die 3 is placed on the lower die 2. During stamping, as the upper die 3 gradually approaches the lower die 2, the guide rod 6 on the upper die 3 approaches and inserts into the locking mechanism 5 on the lower die 2, causing the locking mechanism 5 to automatically engage with the locking part 4 on the upper die 3 to lock, thus fixing the upper die 3 to the lower die 2 and the lower die 2 to the workbench 1. There is no need to manually tighten screws to fix the workbench 1 to the upper die 3 and the upper die 3 to the lower die 2. The operation steps are simple, saving labor, time and effort, and improving work efficiency.

[0032] To facilitate the cooperation between the guide rod 6 and the locking mechanism 5, a wedge-shaped part 61 is provided on the guide rod 6, and the wedge-shaped part 61 is provided on the end face of the guide rod 6 facing the lower mold 2.

[0033] For ease of installation and fixation, the locking mechanism 5 includes a mounting base 51, a transmission rod 52, a drive rod 53, a drive shaft 54, and a screw 55 mounted on the mounting base 51. The transmission rod 52 is rotatably mounted on a bracket 524 via a rotating shaft 523. One end of the transmission rod 52 has a first protrusion 521, and the other end of the transmission rod 52 has a second protrusion 522. The mounting base 51 has an abutment groove 511. When the upper mold 3 approaches the lower mold 2, the wedge-shaped portion 61 on the end face of the guide rod 6 inserts into the abutment groove 511 and pushes the first protrusion 521 out of the abutment groove 511.

[0034] To limit the transmission rod 52, a torsion spring 525 is sleeved on the rotating shaft 523 to limit the transmission rod 52. In the unlocked state, the first protrusion 521 of the transmission rod 52 abuts against the abutment groove 511. At this time, the wedge-shaped part 61 moves away from the first protrusion 521 and exerts no force on the first protrusion 521. The torsion spring 525 is in a free state. In the locked state, the wedge-shaped part 61 inserts into the abutment groove 511 and pushes the first protrusion 521 out of the abutment groove 511. The torsion spring 525 is in a loaded state. At this time, the wedge-shaped part 61 acts on the first protrusion 521, causing the transmission rod 52 to rotate and act on the torsion spring 525. The torsion spring 525 is compressed and deformed by the force of the transmission rod 52.

[0035] To achieve automatic lifting and lowering of the screw 55, the two ends of the drive shaft 54 ​​are mounted on the first bearing 542. The drive shaft 54 ​​is provided with a worm gear 541, and the screw 55 is mounted on the second bearing 552. The screw 55 is threaded with a worm wheel 551. The drive rod 53 moves to drive the drive shaft 54 ​​to rotate. The rotation of the drive shaft 54 ​​drives the worm gear 541 to rotate. The rotation of the worm gear 541 transmits power with the worm wheel 551 and drives the screw 55 to lift and lower to engage with the locking part 4 for locking.

[0036] It is understandable that the axis of the screw 55 intersects the axis of the drive shaft 54 ​​in space, so that the direction of rotation of the drive shaft 54 ​​and the direction of lifting of the screw 55 are not on the same plane. Multi-directional transmission is achieved by using the interleaved transmission of the drive shaft 54 ​​and the screw 55, as well as the interleaved transmission of the worm gear part 541 and the worm wheel part 551.

[0037] For ease of assembly, the mounting base 51 is provided with a mounting hole 512. The drive rod 53 is movably disposed in the mounting hole 512 with one end protruding out of the mounting hole 512. The other end of the drive rod 53 is fitted with a spring 56. The drive rod 53 is limited in the mounting hole 512 by the spring 56. The second protrusion 522 cooperates with the drive rod 53 and moves axially along the mounting hole 512.

[0038] To facilitate positioning, a positioning groove 531 is provided axially in the drive rod 53, and a positioning pin 59 is provided in the positioning groove 531. The positioning pin 59 is fixedly mounted on the mounting base 51. The drive rod 53 can move axially along the mounting hole 512 under the guidance and positioning function of the positioning pin 59. The spring 56 moves axially compressed or stretched along the mounting hole 512, and is limited by the positioning pin 59.

[0039] To facilitate the rapid operation of the drive shaft 54, a drive motor 57 is connected to one end of the drive shaft 54 ​​near 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 improve the hardness of the abutment groove 511 and thus reduce wear, a titanium plating layer is applied to the mating surface of the abutment 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, and it cannot play a wear-resistant role for the abutment groove 511. When the thickness of the titanium plating layer is greater than 5 μm, it may cause large stress to be generated inside the titanium plating layer. When this stress exceeds the capacity of the titanium plating layer itself, it will cause the titanium plating layer to fall off the abutment groove, increasing production costs and being detrimental to production efficiency and environmental protection. The titanium plating layer can significantly improve the surface hardness of the abutment groove 511, thereby enhancing the wear resistance of the surface of the abutment groove 511. In addition, the titanium plating layer has good heat resistance and corrosion resistance, thus effectively reducing the wear of the abutment groove 511 and extending the service life of the mounting base 51.

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

[0042] To further secure the worktable 1 to the injection mold, two symmetrical sides of the worktable 1 are equipped with automatic clamping mechanisms 7 for clamping the lower mold 2, and pneumatic assist mechanisms 8 for driving the automatic clamping mechanisms 7. The pneumatic assist mechanism 8 includes an integrated micro hydraulic cylinder and an accumulator connected to the integrated micro hydraulic cylinder. The integrated micro hydraulic cylinder is compact and can operate efficiently in a limited space. Compared to traditional large hydraulic systems, the integrated micro hydraulic cylinder is more energy-efficient, requires a smaller volume of fluid, reduces energy consumption, and helps reduce environmental impact. During intermittent or periodic operation, the accumulator can store excess pressurized oil output from the pump; energy recovery improves energy utilization and is an important way to save energy. When the system needs it, the accumulator releases the oil. This reduces the rated flow rate of the hydraulic pump, thereby reducing motor power consumption and lowering the system temperature rise. To further improve the clamping effect, the automatic clamping mechanism 7 includes wedge-shaped clamps; preferably, the wedge-shaped clamps are hardened wedges with a 12° self-locking angle. The inclined surface design principle of the wedge-shaped clamping block is mainly to distribute the force applied by the inclined surface to a smaller area, thereby generating a larger vertical force. This design can achieve a large clamping force with a smaller force because when the wedge block is subjected to a force perpendicular to the inclined surface, it will slide along the inclined surface to both sides, thereby generating a huge lateral clamping force, effectively clamping the lower mold 2.

[0043] Understandably, in order to facilitate intuitive feedback on the working status, the automatic clamping mechanism 7 also includes a tactile feedback device, which vibrates to indicate when the automatic clamping mechanism 7 is locked in place.

[0044] In addition to the preferred embodiments described above, there are other embodiments of the present invention. Those skilled in the art can make various changes and modifications based on the present invention, and all such changes and modifications should fall within the scope defined by the appended claims, as long as they do not depart from the spirit of the present invention.

Claims

1. An automatic locking device for a punch die, characterized by: The utility model provides a stamping die locking mechanism, including workbench, the lower mould that sets up on workbench and the upper mould that sets up on lower mould, be equipped with locking portion on lower mould, two symmetrical sides of workbench are equipped with at least one locking mechanism, be equipped with guide rod on the upper mould of corresponding locking mechanism, when upper mould is close to lower mould, guide rod inserts locking mechanism and drives locking mechanism to act and makes locking mechanism cooperate with locking portion and automatically locks lower mould, locking mechanism includes mounting seat, transmission rod, drive rod, drive shaft and screw rod that set up on mounting seat, be equipped with worm portion on drive shaft, be equipped with worm wheel portion with screw thread cooperation on screw rod, drive rod drives drive shaft rotation, drive shaft rotation drives worm portion to make rotary motion, worm portion makes rotary motion and worm wheel portion transmission drives screw rod to make lifting motion and cooperates with locking portion and locks, one end of transmission rod is equipped with first protruding, the other end of transmission rod is equipped with second protruding, be equipped with wedge portion on guide rod, be equipped with abutment slot on mounting seat, wedge portion inserts abutment slot and pushes out first protruding from abutment slot, the middle part of transmission rod is rotatably arranged on the support through the pivot, the torsional spring that is used for limiting transmission rod is sleeved on the pivot, in the initial state, the first protruding of transmission rod abuts with the abutment slot, in the locked state, the wedge portion inserts the abutment slot and pushes out the first protruding from the abutment slot, the end close to transmission rod of drive shaft is connected and is equipped with drive motor, be equipped with proximity switch on drive motor, when transmission rod is close to drive motor, proximity switch triggers drive motor to work, the locking portion includes the through hole that sets up on lower mould and the nut that is fixedly set up on the top of through hole, the screw rod is movably arranged in the through hole and is locked with the nut and upper mould.

2. The automatic locking device of a punch die according to claim 1, characterized in that: The mounting seat is provided with a mounting hole, the drive rod is movably arranged in the mounting hole and one end thereof is exposed outside the mounting hole, a spring is sleeved on the other end of the drive rod, the drive rod is positioned in the mounting hole by the spring, and the second protrusion moves axially along the mounting hole in cooperation with the drive rod.

3. The automatic locking device of a punch die according to claim 1, characterized in that: The abutment slot is provided with a titanium plating layer, and the thickness of the titanium plating layer is 3-5 μm.

4. The automatic locking device of a punch die according to claim 1, characterized in that: The other two symmetrical sides of the workbench are provided with an automatic clamping mechanism for clamping the lower mold and a pneumatic power assisting mechanism for driving the automatic clamping mechanism, and the pneumatic power assisting mechanism comprises an integrated micro hydraulic cylinder and an accumulator connected with the integrated micro hydraulic cylinder.

5. The automatic locking device of a punch die according to claim 4, wherein: The automatic clamping mechanism comprises a wedge-shaped clamping block, and the wedge-shaped clamping block is a hardened wedge-shaped block with a self-locking angle of 12°.

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