Variable speed punch press with large moment of inertia

Abstract

The application provides a variable-speed stamping device with large torque, and relates to the technical field of stamping devices. The device comprises a main frame body, an upper die assembly, a lower die assembly and a driving part. The driving part comprises a first driving shaft and a second driving shaft connected through a gear transmission mechanism. The two ends of the first driving shaft are connected with a first driving gear through a first one-way bearing, and the two ends of the second driving shaft are connected with a second driving gear through a second one-way bearing. The first driving shaft or the second driving shaft is connected with a first servo motor through a worm gear. A rack is arranged between the first driving gear and the second driving gear. The first transmission side engaged with the first driving gear comprises a low-speed stroke section and a high-speed stroke section from top to bottom in sequence, the second transmission side engaged with the second driving gear is a high-speed stroke section, and the pitch of the high-speed stroke section is greater than that of the low-speed stroke section. The device can reliably cope with high-frequency stamping and large-tonnage application scenarios.

Description

Technical Field

[0001] This invention relates to the field of stamping equipment technology, specifically a variable speed stamping equipment with a large torque increase. Background Technology

[0002] Stamping, as one of the indispensable key core processes in the field of mechanical manufacturing, plays an extremely important role in modern industrial production. It is widely and deeply applied to the precision forming and processing of parts in many industries such as automobile manufacturing, home appliances, and hardware products.

[0003] Stamping equipment (also known as presses) used for stamping processes are mainly classified into mechanical presses, hydraulic presses, and servo presses according to their drive methods. Among them, servo presses are widely favored due to their extremely high flexibility, programmable speed and stroke, high precision, excellent energy efficiency, and greater energy saving and quietness.

[0004] However, in current industrial applications, existing servo presses generally employ a fixed single transmission ratio design, thus relying solely on the servo motor itself to control the stamping speed. This structural limitation means that in high-speed applications requiring extremely high stamping frequencies (e.g., exceeding 800 times per minute), the control system of the servo press often faces a significant bottleneck in response speed, making it difficult to achieve rapid and precise dynamic adjustments. Simultaneously, existing servo presses often suffer from insufficient stamping force during actual operation. This not only limits their performance in handling high-strength or high-precision machining requirements but also significantly restricts their application in large-tonnage, high-load situations, making it difficult to meet the ever-increasing demands of industrial processing. Summary of the Invention

[0005] To address the issues of existing servo presses being unable to meet the demands of high-frequency stamping and insufficient stamping force, this application provides a variable-speed stamping device with a large torque boost that can reliably handle high-frequency stamping and large-tonnage application scenarios.

[0006] The technical solution adopted by this invention to solve its technical problem is: A variable speed stamping device with high torque includes a main frame, an upper die assembly, a lower die assembly, and a drive assembly for driving the upper die assembly to move up and down. The drive assembly includes a drive component, which includes a first drive shaft and a second drive shaft rotatably mounted on the main frame. The first drive shaft and the second drive shaft are connected by a gear transmission mechanism. The two ends of the first drive shaft are respectively connected to the first drive gear through the first one-way bearing, and the two ends of the second drive shaft are respectively connected to the second drive gear through the second one-way bearing; The main frame is rotatably equipped with a worm gear and a first servo motor for driving the worm gear to rotate, and a worm wheel that meshes with the worm gear is provided on the first drive shaft or the second drive shaft; A rack with its lower end fixed to the upper mold assembly is provided between the first drive gear and the second drive gear. The first transmission side that meshes with the first drive gear includes a low-speed stroke section and a high-speed stroke section from top to bottom. The second transmission side that meshes with the second drive gear is the high-speed stroke section. The tooth pitch of the high-speed stroke section is greater than the tooth pitch of the low-speed stroke section. When the rack moves downward, the first one-way bearing is locked and the second one-way bearing is in a free-rotating state.

[0007] Furthermore, two gear transmission mechanisms are provided between the first drive shaft and the second drive shaft, and the two gear transmission mechanisms are arranged symmetrically about the worm gear.

[0008] Furthermore, the main frame is provided with a clearance hole for accommodating the rack, the rack is provided with a guide boss, and the side wall of the clearance hole is provided with a guide groove that cooperates with the guide boss.

[0009] Furthermore, it also includes a pressing component, which includes a pressing ring and a mounting bracket located below the lower mold assembly. The mounting bracket is rotatably equipped with a driving cylinder and a second servo motor for driving the driving cylinder to rotate. A lifting bracket is slidably equipped on the mounting bracket, and the upper end of the lifting bracket is connected to the pressing ring. The driving cylinder has a driving groove on its cylindrical side, and the lifting bracket has a driving column that cooperates with the driving groove. When the driving cylinder rotates one revolution, the pressing ring can complete one up-and-down movement under the drive of the lifting bracket.

[0010] Furthermore, the mounting frame includes a mounting plate with two upright plates. A first horizontal plate and a second horizontal plate are arranged sequentially from top to bottom between the two upright plates. The driving cylinder is located between the first horizontal plate and the second horizontal plate. The second servo motor is located below the second horizontal plate. The lifting frame includes a lifting plate with a first guide post and a second guide post. The mounting frame has guide holes that mate with the first guide post. The driving post is fixedly mounted on the first guide post. The upper end of the second guide post is connected to the pressure ring.

[0011] Furthermore, the pressure ring is provided with several positioning mechanisms, so that when the sheet metal is placed on the pressure ring, the sheet metal is confined within the stamping area.

[0012] Furthermore, the pressure ring is provided with a guide notch, and the positioning mechanism includes a positioning plate slidably disposed within the guide notch. Ear plates are respectively provided on both sides of the outer end of the positioning plate, and a third guide post is provided on the ear plates. An insertion hole is provided on the side of the pressure ring, and a spring is disposed within the insertion hole. The end of the third guide post is inserted into the insertion hole and abuts against the end face of the spring. An adjusting stud is provided within the guide notch. One end of the adjusting stud is fixedly connected to the pressure ring, and the other end of the adjusting stud penetrates the positioning plate. An adjusting nut is provided on the adjusting stud located on the outer side of the positioning plate.

[0013] Furthermore, a guide plate is provided on the main frame, and a locking block is slidably disposed in the guide plate. The locking block includes a guide part, and a locking plate is provided at one end of the guide part facing the rack. A locking groove is provided on the rack, and a positioning pin is provided between the guide plate and the locking block.

[0014] Furthermore, the main frame is provided with a plurality of cleaning nozzles. Each cleaning nozzle includes a main housing, a first air jet, a second air jet, and an air inlet. The opening of the first air jet faces obliquely upward and is used to blow clean the upper surface of the upper mold and the plate. The opening of the second air jet faces obliquely downward and is used to blow clean the lower surface of the lower mold and the plate.

[0015] Furthermore, a cover is provided at the upper end of the main frame, and the cover and the main frame together form a cavity. The drive unit is installed in the cavity, and a heat dissipation pipe is also provided in the cavity.

[0016] The beneficial effects of this invention are: 1. The variable-speed stamping equipment with high torque provided in this application utilizes the self-locking characteristics of worm gear transmission and the ability to achieve a large reduction ratio to efficiently convert the small torque input of the servo motor into a large torque output. This design effectively solves the problem of insufficient stamping force of existing servo stamping presses, enabling the equipment to easily cope with high-strength, high-precision, and large-tonnage processing requirements, and significantly broadening the industrial application range of servo stamping presses.

[0017] 2. The variable-speed stamping equipment with high torque provided in this application creatively divides the rack into a high-speed stroke segment and a low-speed stroke segment. During non-working strokes (such as return stroke and rapid traverse), the gear meshes with the sparse, large teeth of the high-speed stroke segment, improving the equipment cycle time and production efficiency. During the working stroke (stamping), the gear meshes with the dense, small teeth of the low-speed stroke segment to achieve slow pressurization, effectively preventing workpiece deformation or springback caused by excessive speed, and significantly improving stamping quality. This purely mechanical speed-changing structure perfectly avoids the response bottleneck problem that exists in high-speed applications when relying solely on servo motor speed regulation.

[0018] 3. The variable speed stamping equipment with large torque provided in this application embodiment uses the drive groove on the drive cylinder to drive the lifting frame to make precise up and down reciprocating motion, which can provide synchronous, stable and uniform lifting force for the blank holder, effectively improving the stability and reliability of complex stamping processes.

[0019] 4. The variable speed stamping equipment with large torque provided in this application embodiment can clean the upper and lower dies and the upper and lower sides of the sheet metal to be processed by setting a cleaning nozzle, thereby timely removing metal debris generated during the stamping process and avoiding damage to the dies or affecting the processing accuracy. Attached Figure Description

[0020] Figure 1 A three-dimensional structural schematic diagram of a variable speed stamping device with large torque amplification provided for an embodiment of this application; Figure 2 for Figure 1 A magnified structural diagram of part A in the middle; Figure 3 for Figure 1 A magnified structural diagram of part B in the middle section; Figure 4 A front view of a variable speed stamping device with high torque provided for an embodiment of this application; Figure 5 for Figure 4 AA section view in the middle; Figure 6 This is the main view of the slider; Figure 7 This is a schematic diagram of the three-dimensional structure of the slider; Figure 8 Schematic diagram of the three-dimensional structure of the drive assembly Figure 1 ; Figure 9 for Figure 8 A magnified structural diagram of section C; Figure 10 This is a schematic diagram of the three-dimensional structure of the locking block; Figure 11 Working state of the locking block Figure 1 ; Figure 12 Working state of the locking block Figure 2 ; Figure 13 Schematic diagram of the three-dimensional structure of the drive assembly Figure 2 ; Figure 14 A three-dimensional structural diagram of the edge-pressing component; Figure 15 This is a schematic diagram of the three-dimensional structure of the pressure ring; Figure 16 for Figure 15 A magnified structural diagram of section D; Figure 17 This is a partial sectional view of the pressure ring; Figure 18 A schematic diagram illustrating the principle of speed regulation achieved through the interaction of rack and pinion; Figure 19 This is a schematic diagram of the installation structure of the casing.

[0021] In the diagram: 1. Main frame; 11. Base plate; 12. Top plate; 121. Guide plate; 1211. First positioning hole; 131. First column; 132. Second column; 133. Third column; 14. First worktable; 15. Second worktable; 16. Clearance hole; 161. Guide groove; 2. Upper mold assembly; 21. Slider; 22. Upper mold; 3. Lower mold assembly; 31. Lower mold base; 32. Lower mold; 4. Drive assembly; 41. Drive component; 411. First drive shaft; 4111. First transmission gear; 4112. First drive gear; 4113. First one-way bearing; 4114. Worm gear; 412. Second drive shaft; 4121. Second transmission gear; 4122. Second drive gear; 4123. Second one-way bearing; 413. Worm; 414. First servo motor; 415. Coupling; 416. Bearing with mounting bracket; 417. Rack; 4171. First transmission side; 4172. Second transmission side; 4173. Guide boss; 4174. Locking groove; 5. Edge clamping assembly; 51. Mounting bracket; 511. Mounting plate; 512. Vertical plate; 513. First horizontal plate; 514. Second horizontal plate; 52. Drive cylinder; 521. Drive groove; 53. Second servo motor; 54. Lifting frame; 541. Lifting plate; 542. First guide post; 5421. Fixing block; 5422. Drive post; 543. Second guide post; 55. Edge clamping ring; 551. Guide notch; 552. Insertion hole; 56. Positioning mechanism; 561. Positioning plate; 5611. Guide groove; 5612. Ear plate; 5613. Third guide post; 562. Spring; 563. Adjusting stud; 564. Adjusting nut; 6. Cleaning nozzle; 61. Main housing; 62. First air jet; 63. Second air jet; 64. Air inlet; 7. Locking block; 71. Guide part; 711. Second positioning hole; 72. Grip part; 73. Locking plate; 81. Housing; 82. Heat dissipation pipe; 9. Board material. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are merely a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the protection scope of this application.

[0023] To facilitate understanding of the specific embodiments of this application, a coordinate system is now defined as follows: Figure 1 As shown, the left and right directions are horizontal, the front and back directions are vertical, and the up and down directions are vertical.

[0024] Example 1 like Figure 1 and Figure 4 As shown, a variable speed stamping device with high torque includes a main frame 1. The main frame 1 includes a top plate 12, a bottom plate 11, and four columns for connecting the top plate 12 and the bottom plate 11. A first workbench 14 and a second workbench 15 are arranged sequentially from top to bottom between the top plate 12 and the bottom plate 11.

[0025] In one specific implementation, the columns in this embodiment, from top to bottom, include a first column 131, a second column 132, and a third column 133. The first column 131 is located between the top plate 12 and the first workbench 14. The upper end of the first column 131 is fixedly connected to the top plate 12 by welding, and the lower end is fixedly connected to the first workbench 14 by welding. The second column 132 is located between the first workbench 14 and the second workbench 15. Its upper end is fixedly connected to the first workbench 14 by welding, and its lower end is fixedly connected to the second workbench 15 by welding. The third column 133 is located between the second workbench 15 and the base plate 11. Its upper end is fixedly connected to the second workbench 15 by welding, and its lower end is fixedly connected to the base plate 11 by welding.

[0026] An upper mold assembly 2 is disposed below the first workbench 14. The upper mold assembly 2 includes a slider 21 and an upper mold 22 fixedly disposed on the lower side of the slider 21. The slider 21 is slidably connected to the main frame 1. A lower mold assembly 3 is fixedly disposed on the upper side of the second workbench 15. The lower mold assembly 3 includes a lower mold base 31 and a lower mold 32 fixedly disposed on the lower mold base 31. The upper mold 22 and the lower mold 32 are vertically aligned and together complete the stamping forming of the sheet metal 9.

[0027] The main frame 1 is provided with a drive unit 4 for driving the slider 21 to move up and down.

[0028] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 13 As shown, the drive assembly 4 includes two identical and symmetrically arranged drive components 41. According to... Figure 1 In the coordinate system shown, the two drive components 41 are located on the left and right sides of the main frame 1, respectively. This symmetrical arrangement provides a smooth and balanced driving force to the slider 21, effectively avoiding uneven loading and thus improving the stability of the stamping process.

[0029] The structure of a single drive component 41 will now be described in detail, using it as an example. The drive component 41 includes a first drive shaft 411 and a second drive shaft 412 arranged in parallel. Figure 1 In the coordinate system shown, the first drive shaft 411 and the second drive shaft 412 extend in the front-rear direction. Both the first drive shaft 411 and the second drive shaft 412 are located below the top plate 12 and are rotatably connected to the top plate 12 via bearing assemblies (e.g., vertical bearing 416). A first drive gear 4112 is provided at each end of the first drive shaft 411, and the first drive gear 4112 is connected to the first drive shaft 411 via a first one-way bearing 4113. A second drive gear 4122 is provided at each end of the second drive shaft 412, and the second drive gear 4122 is connected to the second drive shaft 412 via a second one-way bearing 4123. A first transmission gear 4111 is provided on the first drive shaft 411, and a second transmission gear 4121 meshing with the first transmission gear 4111 is provided on the second drive shaft 412. A worm gear 413 for transmitting power is provided between the first drive shaft 411 and the second drive shaft 412. A detachable first servo motor 414 is fixedly mounted on the upper side of the top plate 12. The output shaft of the first servo motor 414 passes through the top plate 12 and is connected to the upper end of the worm gear 413 via a coupling 415. The lower end of the worm gear 413 is rotatably connected to the first worktable 14 via a bearing 416. A worm wheel 4114 that meshes with the worm gear 413 is provided on the first drive shaft 411 or the second drive shaft 412.

[0030] In one specific embodiment, the worm gear 4114 is fixedly mounted on the first drive shaft 411. The first drive shaft 411 is provided with two first transmission gears 4111, which are located on both sides of the worm gear 4114. Correspondingly, the second drive shaft 412 is provided with two second transmission gears 4121, which mesh with the first transmission gears 4111 on both sides, thereby forming a dual-sided synchronous transmission structure.

[0031] The worm gear 4114 and worm 413 transmission pair utilizes their advantages of large transmission ratio, compact structure, and self-locking function. During operation, the small torque input of the first servo motor 414 is efficiently converted into a large torque output through the worm gear 4114 and worm 413 pair, effectively solving the problem of insufficient punching force in existing servo punch presses, enabling the equipment to easily handle high-intensity and high-tonnage processing requirements.

[0032] A rack 417 is disposed between a first drive gear 4112 and a second drive gear 4122 located on the same side (e.g., the front side), and the first drive gear 4112 and the second drive gear 4122 mesh with the rack 417 respectively. The lower end of the rack 417 is fixedly connected to the slider 21, and the upper end of the rack 417 extends sequentially through the first worktable 14 and the top plate 12 to the top of the top plate 12. Accordingly, both the first worktable 14 and the top plate 12 are provided with clearance holes 16 for accommodating the rack 417.

[0033] The rack 417 includes a first transmission side 4171 and a second transmission side 4172. The first transmission side 4171 meshes with the first drive gear 4112, and the second transmission side 4172 meshes with the second drive gear 4122. The first transmission side 4171 includes a low-speed stroke section and a high-speed stroke section from top to bottom, and the second transmission side 4172 is entirely a high-speed stroke section, wherein the tooth pitch M of the high-speed stroke section is greater than the tooth pitch N of the low-speed stroke section.

[0034] Due to the change in tooth pitch, the module, pressure angle, and tooth profile of the corresponding teeth must also change to ensure meshing. For example... Figure 18 As shown, the tooth structure of the high-speed stroke section has a larger module and pressure angle, a wider tooth root, and a shallow bevel on the tooth flank, resulting in a larger meshing radius when meshing with the gear. The tooth structure of the low-speed stroke section, on the other hand, has a smaller module and pressure angle, a thinner tooth root, and a steeper bevel on the tooth flank, resulting in a smaller meshing radius when meshing with the gear. Thus, if the gear (first drive gear 4112 or second drive gear 4122) rotates through a pitch angle α, the movement distance of the rack 417 is M when meshing with the high-speed stroke section, and N when meshing with the low-speed stroke section. Therefore, compared to the low-speed stroke section, the slider 21 runs faster when the gear meshes with the rack 417 in the high-speed stroke section, enabling rapid descent and return, thereby shortening the production cycle and improving production efficiency. Furthermore, this speed change does not depend on the real-time speed control command of the servo motor, but is automatically completed through the inherent characteristics of the mechanical structure, adapting to the needs of high-frequency stamping.

[0035] When the rack 417 moves downward relative to the main frame 1, the first one-way bearing 4113 is locked and the second one-way bearing 4123 is in a free-rotating state; conversely, when the rack 417 moves upward relative to the main frame 1, the first one-way bearing 4113 is in a free-rotating state and the second one-way bearing 4123 is locked, thereby realizing differentiated transmission response of the rack 417 in the up and down stroke.

[0036] The rack 417 features a segmented structure with rigid connections between high-speed and low-speed stroke sections. This allows the slider 21 to respond at high speed during the idle stroke to improve efficiency, while automatically switching to a low-speed state during the stamping stroke. This precisely matches the requirements of different working conditions, significantly improving forming quality and equipment energy efficiency. The dual one-way bearing coordination mechanism ensures that only the first drive shaft 411 outputs power on one side during forward drive, and only the second drive shaft 412 outputs power on one side during reverse drive. This ingenious design provides the core foundation for realizing the segmented variable speed drive of the rack 417, solving the control complexity and response delay problems caused by solely relying on servo motor speed regulation.

[0037] Furthermore, such as Figure 7 and Figure 9 As shown, the rack 417 is provided with a guide boss 4173, and the side wall of the clearance hole 16 is provided with a guide groove 161 that mates with the guide boss 4173. The cooperation between the guide boss 4173 and the guide groove 161 ensures the movement accuracy of the rack 417, thereby ensuring the stamping quality.

[0038] As one specific implementation method, according to Figure 1 In the coordinate system shown, guide bosses 4173 are provided on both the front and rear sides of the rack 417 in this embodiment, and guide grooves 161 are machined on the front and rear side walls corresponding to the avoidance holes 16 of the top plate 12, forming a double-sided symmetrical guide constraint.

[0039] Here, the rack 417 is not only a driving component for driving the slider 21 to move up and down, but also a core guiding reference component for the slider 21 to move up and down relative to the main frame 1. Its guide boss 4173 and the guide groove 161 of the top plate 12 form a high-precision sliding pair.

[0040] like Figure 14 , Figure 15 , Figure 16 and Figure 17As shown, a variable-speed stamping device with high torque also includes a blank holder assembly 5. The blank holder assembly 5 includes a blank holder ring 55 located on the upper side of the lower die assembly 3. A mounting frame 51 is provided below the second worktable 15, and a drive cylinder 52 and a second servo motor 53 for driving the drive cylinder 52 to rotate are rotatably mounted on the mounting frame 51. A lifting frame 54 is provided above the mounting frame 51, and the lifting frame 54 is slidably connected to the mounting frame 51. The upper end of the lifting frame 54 passes through the second worktable 15 and is fixedly connected to the blank holder ring 55 in a detachable manner. A spiral drive groove 521 is provided on the cylindrical side of the drive cylinder 52, and a drive column 5422 that cooperates with the drive groove 521 is provided on the lifting frame 54. During operation, the second servo motor 53 drives the drive cylinder 52 to rotate. Through the cooperation of the drive groove 521 and the drive column 5422, the rotational motion is converted into precise linear motion, thereby driving the lifting frame 54 to move the pressure ring 55 up and down.

[0041] In one specific embodiment, the mounting frame 51 in this embodiment includes a mounting plate 511, which is fixedly mounted on the base plate 11 of the main frame 1. Two upright plates 512 are vertically fixed to the upper surface of the mounting plate 511, and a first horizontal plate 513 and a second horizontal plate 514 are sequentially fixedly connected between the two upright plates 512 from top to bottom. The driving cylinder 52 is located between the first horizontal plate 513 and the second horizontal plate 514, and its upper and lower ends are rotatably connected to the first horizontal plate 513 and the second horizontal plate 514 respectively via bearing assemblies. The second servo motor 53 is located below the second horizontal plate 514, and its output shaft is connected to the lower end of the driving cylinder 52 via a coupling 415. The lifting frame 54 includes a lifting plate 541. On the bottom surface of the lifting plate 541, on both sides of the driving cylinder 52, are respectively provided first guide posts 542 extending downwards perpendicularly to the lifting plate 541. The first horizontal plate 513 and the second horizontal plate 514 are each provided with guide holes that slide with the first guide posts 542. A fixing block 5421 is fixedly provided on the first guide post 542, and a driving post 5422 is provided on the fixing block 5421. The end of the driving post 5422 is inserted into a driving groove 521 and forms a guiding engagement with the driving groove 521. A second guide post 543 extending upwards perpendicularly to the lifting plate 541 is provided on the lifting plate 541. The upper end of the second guide post 543 passes sequentially through the edges of the second worktable 15 and the lower mold assembly 3 and is detachably fixedly connected to the pressure ring 55. For example, the pressure ring 55 is fixedly connected to the upper end face of the second guide post 543 by a bolt assembly.

[0042] In one specific implementation, the lifting plate 541 described in this embodiment is provided with four second guide posts 543, and the four second guide posts 543 are rectangularly distributed and located at the four corners of the lifting plate 541 respectively.

[0043] Here, the second guide post 543 may simply pass through the second worktable 15. For example, the spacing between two adjacent second guide posts 543 may be increased, or a clearance structure may be provided on the side of the lower mold assembly 3 to avoid the second guide post 543.

[0044] Furthermore, such as Figure 15 , Figure 16 and Figure 17 As shown, the pressure ring 55 is provided with several positioning mechanisms 56. When the sheet metal 9 is placed on the pressure ring 55, the sheet metal 9 is restricted within the stamping area to prevent movement during the stamping process and improve stamping accuracy.

[0045] In one specific implementation, the pressure ring 55 described in this embodiment is provided with four positioning mechanisms 56, and the four positioning mechanisms 56 are respectively located on the four sides of the pressure ring 55.

[0046] The pressure ring 55 is provided with a guide notch 551. The positioning mechanism 56 includes a positioning plate 561 slidably disposed within the guide notch 551. Ear plates 5612 are respectively provided on both sides of the outer end of the positioning plate 561 (with the end furthest from the inner hole of the pressure ring 55 as the outer end). A third guide post 5613 is provided on the ear plate 5612, extending perpendicularly to the ear plate 5612 towards the side near the pressure ring 55. The side of the pressure ring 55 is provided with insertion holes 552 aligned one-to-one with the third guide posts 5613. A spring 562 is disposed within the insertion hole 552. The end of the third guide post 5613 is inserted into the insertion hole 552 and abuts against the end face of the spring 562. An adjusting stud 563 is provided in the guide notch 551. One end of the adjusting stud 563 is fixedly connected to the pressure ring 55 by welding. The other end of the adjusting stud 563 extends outward through the positioning plate 561 to the outer side of the positioning plate 561 (with the end away from the inner hole of the pressure ring 55 as the outer end). An adjusting nut 564 is provided on the adjusting stud 563 on the outer side of the positioning plate 561. The adjusting nut 564 is threadedly engaged with the adjusting stud 563.

[0047] In one specific implementation, guide grooves 5611 are respectively provided on both sides of the positioning plate 561 in this embodiment, and the side wall edge of the guide notch 551 extends into the guide groove 5611 to form a guide fit.

[0048] The position of the positioning plate 561 can be adjusted by adjusting the nut 564, thereby adapting to the positioning requirements of different specifications of sheet metal 9 and ensuring its accurate positioning in the stamping area.

[0049] Furthermore, in order to improve safety during equipment maintenance, such as Figure 10 , Figure 11 and Figure 12 As shown, a guide plate 121 is provided on one side of each rack 417 on the top plate 12, and a locking block 7 is slidably disposed within the guide plate 121. The locking block 7 has two working positions. When the equipment needs maintenance or mold replacement, the locking block 7 is pushed into the first working position. At this time, the locking plate 73 of the locking block 7 is inserted into the locking groove 4174 of the rack 417, thereby mechanically locking the rack 417 and preventing the slider 21 from sliding down due to accidents (such as hydraulic leakage or servo motor power failure), providing reliable safety for the operator. When the equipment is working normally, the locking block 7 is pulled out to the second working position. The locking plate 73 disengages from the locking groove 4174, and the rack 417 is in an unlocked state and can move freely up and down.

[0050] In one specific embodiment, the locking block 7 in this embodiment includes a guide portion 71. Two locking plates 73 are provided at one end of the guide portion 71 facing the rack 417. Correspondingly, two locking grooves 4174 are provided on the rack 417, each corresponding to one of the locking plates 73. A grip portion 72 is provided at the end of the guide portion 71 facing away from the rack 417, allowing the operator to grip and push the locking block 7 to slide along the guide plate 121. A positioning pin (not shown in the figure) is provided between the guide plate 121 and the locking block 7. The upper end of the guide plate 121 has a first positioning hole 1211 for receiving the positioning pin, and the upper side of the guide portion 71 has two second positioning holes 711 for receiving the positioning pin. When the first positioning hole 1211 is aligned with one of the second positioning holes 711, the locking block 7 is in a first working position; when the first positioning hole 1211 is aligned with the other second positioning hole 711, the locking block 7 is in a second working position.

[0051] Furthermore, such as Figure 1 , Figure 2 and Figure 4As shown, each of the four columns is equipped with a cleaning nozzle 6 on one side facing the interior of the main frame 1. When the upper mold assembly 2 is at its upper limit position, the cleaning nozzle 6 is located between the upper mold assembly 2 and the lower mold assembly 3. The cleaning nozzle 6 includes a main housing 61, on which a first air jet port 62, a second air jet port 63, and an air inlet 64 are provided, all communicating with the internal cavity of the main housing 61. The opening of the first air jet port 62 faces obliquely upward, and the opening of the second air jet port 63 faces obliquely downward. The air inlet 64 is connected to an air source (such as an air pump) via a pipeline. The first air jet port 62 is used to clean the upper surface of the upper mold 22 and the plate 9, and the second air jet port 63 is used to clean the lower surface of the lower mold 32 and the plate 9. The spray directions of the first air jet port 62 and the second air jet port 63 are set at an angle. By setting the cleaning nozzle 6, impurities on the sheet metal 9 and the mold surface can be removed efficiently and comprehensively, effectively preventing defects such as crushing and scratching during stamping, thereby significantly improving the yield of stamped products.

[0052] Furthermore, such as Figure 1 and Figure 19 As shown, a cover 81 is provided at the upper end of the main frame 1. The cover 81 and the first worktable 14 together form a relatively closed cavity, and the drive assembly 4 is located inside the cavity. The cover 81 effectively isolates high-speed moving components such as gears and racks 417, prevents lubricating oil splashing and foreign objects from entering, and also reduces the noise during equipment operation. A heat dissipation pipe 82 is also provided inside the cavity. The two ends of the heat dissipation pipe 82 pass through the cover 81 and are connected to the inlet and outlet of the refrigeration unit (not shown in the figure), respectively. In one specific embodiment, the heat dissipation pipe 82 is fixed to the lower side of the top plate 12 by a detachable method such as pipe clamps. Since the drive assembly 4 generates a lot of heat under high-speed and heavy-load conditions, by providing the heat dissipation pipe 82, the refrigerant circulates through the heat dissipation pipe 82 and the refrigeration unit, which can force cooling of the closed cavity, ensuring that key components such as gears and bearings operate at a suitable temperature and extending the service life of the equipment.

[0053] The working process of a variable speed stamping device with high torque is as follows: First, when the plate 9 is placed on the pressure ring 55, the cleaning nozzle 6 is activated, spraying high-speed airflow from the first air outlet 62 and the second air outlet 63 to clean the upper mold 22 and the upper surface of the plate 9 in all directions.

[0054] Second, the second servo motor 53 starts, and the pressure ring 55 drives the plate 9 to move upward together, so that the plate 9 on the pressure ring 55 fits into the upper mold 22.

[0055] Third, the cleaning nozzle 6 is activated, spraying high-speed airflow from the first air outlet 62 and the second air outlet 63 to clean the lower surface of the plate 9 and the lower mold 32 in all directions.

[0056] Fourth, the first servo motor 414 starts, driving the first drive shaft 411 and the second drive shaft 412 to rotate synchronously via the worm gear 4114 and worm 413, which in turn drives the upper mold assembly 2 to move downwards via the rack 417. At this time, the first one-way bearing 4113 is locked, and the first drive shaft 411, as the power shaft, can drive the first drive gear 4112 to rotate synchronously. The first drive gear 4112 meshes with the first transmission side 4171 of the rack 417, thereby driving the rack 417 to move downwards; the second one-way bearing 4123 is in a free-rotating state, the second drive shaft 412 does not participate in power transmission, and the second drive gear 4122 is in a follow-up state. At the same time, the second servo motor 53 drives the pressure ring 55 to move downwards at the same speed as the upper mold assembly 2, thereby ensuring that the plate 9 is always in close contact with the upper mold 22 during the descent of the upper mold 22, until the plate 9 is in contact with the upper surface of the lower mold 32. During this process, the high-speed stroke section of the first transmission side 4171 of the rack 417 meshes with the first drive gear 4112, realizing rapid descent during the high-speed idle stroke stage.

[0057] Fifth, the second servo motor 53 stops operating, and the first servo motor 414 drives the upper mold 22 to continue moving downwards until the upper mold 22 and the lower mold 32 are in complete contact and the stamping is completed. During this process, the low-speed stroke section of the first transmission side 4171 of the rack 417 meshes with the first drive gear 4112 to achieve precise and stable downward movement during the low-speed heavy-load stamping stage.

[0058] Sixth, after the upper die assembly 2 completes the stamping, it begins its return stroke. The first servo motor 414 reverses, driving the upper die assembly 2 upward. At this time, the second one-way bearing 4123 is in a free-rotating state. The second drive shaft 412, as the power shaft, drives the second drive gear 4122 to rotate synchronously. The second drive gear 4122 meshes with the second transmission side 4172 of the rack 417, driving the rack 417 to return upward. The first one-way bearing 4113 is in a free-rotating state, and the first drive shaft 411 does not participate in power transmission. The first drive gear 4112 is in a follow-up state. The second transmission side 4172 of the rack 417 is entirely in the high-speed stroke section, thus ensuring high-speed operation during the return stroke, significantly shortening the non-working stroke time, thereby effectively increasing the stamping frequency per unit time and further alleviating the bottleneck problem of high-frequency stamping response.

[0059] Example 2 Remove the guide boss 4173 and guide groove 161. The slider 21 is provided with a fourth guide post extending upward perpendicular to the slider 21, and the first worktable 14 is provided with a guide slide that cooperates with the fourth guide post.

[0060] In one specific implementation, the slider 21 in this embodiment is provided with four fourth guide posts, which are arranged in a rectangular shape and located at the four corners of the slider 21. The guide slide is a linear bearing mounted on the first worktable 14.

[0061] The rest of the structure is the same as in Example 1.

[0062] Other embodiments obtained by those skilled in the art based on the embodiments provided in this application by combining, splitting, or reorganizing the embodiments of this application do not exceed the protection scope of this application.

[0063] The above detailed embodiments have provided a detailed explanation of the purpose, technical solutions, and beneficial effects of the embodiments of this application. The above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. That is, any modifications, equivalent substitutions, improvements, etc., made on the basis of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A variable speed stamping device with high torque, comprising a main frame (1), an upper die assembly (2), a lower die assembly (3), and a drive unit (4) for driving the upper die assembly (2) to move up and down, characterized in that: The drive assembly (4) includes a drive component (41), which includes a first drive shaft (411) and a second drive shaft (412) rotatably mounted on the main frame (1). The first drive shaft (411) and the second drive shaft (412) are connected by a gear transmission mechanism. The two ends of the first drive shaft (411) are respectively connected to the first drive gear (4112) through the first one-way bearing (4113), and the two ends of the second drive shaft (412) are respectively connected to the second drive gear (4122) through the second one-way bearing (4123). The main frame (1) is rotatably provided with a worm gear (413) and a first servo motor (414) for driving the worm gear (413) to rotate. The first drive shaft (411) or the second drive shaft (412) is provided with a worm wheel (4114) that meshes with the worm gear (413). A rack (417) with its lower end fixed to the upper mold assembly (2) is provided between the first drive gear (4112) and the second drive gear (4122). The first transmission side (4171) meshing with the first drive gear (4112) includes a low-speed stroke section and a high-speed stroke section from top to bottom. The second transmission side (4172) meshing with the second drive gear (4122) is the high-speed stroke section. The tooth pitch of the high-speed stroke section is greater than the tooth pitch of the low-speed stroke section. When the rack (417) moves downward, the first one-way bearing (4113) is in a locked state, and the second one-way bearing (4123) is in a free-rotating state.

2. The variable speed stamping equipment with high torque as described in claim 1, characterized in that: Two gear transmission mechanisms are provided between the first drive shaft (411) and the second drive shaft (412), and the two gear transmission mechanisms are arranged symmetrically about the worm gear (4114).

3. The variable speed stamping equipment with high torque as described in claim 1, characterized in that: The main frame (1) is provided with a clearance hole (16) for accommodating the rack (417), the rack (417) is provided with a guide boss (4173), and the side wall of the clearance hole (16) is provided with a guide groove (161) that cooperates with the guide boss (4173).

4. The variable speed stamping equipment with large torque as described in claim 1, characterized in that: It also includes a pressing component (5), which includes a pressing ring (55) and a mounting frame (51) located below the lower mold assembly (3). The mounting frame (51) is rotatably equipped with a driving cylinder (52) and a second servo motor (53) for driving the driving cylinder (52) to rotate. A lifting frame (54) is slidably equipped on the mounting frame (51). The upper end of the lifting frame (54) is connected to the pressing ring (55). A driving groove (521) is provided on the cylindrical side of the driving cylinder (52). A driving column (5422) that cooperates with the driving groove (521) is provided on the lifting frame (54). When the driving cylinder (52) rotates one revolution, the pressing ring (55) can complete one up and down movement under the drive of the lifting frame (54).

5. A variable speed stamping device with high torque as described in claim 4, characterized in that: The mounting frame (51) includes a mounting plate (511), on which two upright plates (512) are provided. Between the two upright plates (512), a first horizontal plate (513) and a second horizontal plate (514) are arranged from top to bottom. The driving cylinder (52) is located between the first horizontal plate (513) and the second horizontal plate (514). The second servo motor (53) is located below the second horizontal plate (514). The lifting frame (54) includes a lifting plate (541), on which a first guide post (542) and a second guide post (543) are provided. The mounting frame (51) is provided with a guide hole that cooperates with the first guide post (542). The driving post (5422) is fixedly installed on the first guide post (542). The upper end of the second guide post (543) is connected to the pressure ring (55).

6. A variable speed stamping device with high torque as described in claim 4, characterized in that: The pressure ring (55) is provided with several positioning mechanisms (56). When the plate (9) is placed on the pressure ring (55), the plate (9) is restricted within the stamping area.

7. A variable speed stamping device with high torque as described in claim 6, characterized in that: The pressure ring (55) is provided with a guide notch (551). The positioning mechanism (56) includes a positioning plate (561) slidably disposed within the guide notch (551). Ear plates (5612) are respectively provided on both sides of the outer end of the positioning plate (561). A third guide post (5613) is provided on the ear plate (5612). A insertion hole (552) is provided on the side of the pressure ring (55). A spring (562) is disposed within the insertion hole (552). The end of the third guide post (5613) is inserted into the insertion hole (552) and abuts against the end face of the spring (562). An adjusting stud (563) is provided in the guide notch (551). One end of the adjusting stud (563) is fixedly connected to the pressure ring (55), and the other end of the adjusting stud (563) passes through the positioning plate (561). An adjusting nut (564) is provided on the adjusting stud (563) on the outside of the positioning plate (561).

8. A variable speed stamping device with high torque as described in claim 1, characterized in that: The main frame (1) is provided with a guide plate (121), and a locking block (7) is slidably provided in the guide plate (121). The locking block (7) includes a guide part (71), and a locking plate (73) is provided at one end of the guide part (71) facing the rack (417). A locking groove (4174) is provided on the rack (417), and a positioning pin is provided between the guide plate (121) and the locking block (7).

9. A variable speed stamping device with high torque as described in claim 1, characterized in that: The main frame (1) is provided with a plurality of cleaning nozzles (6). Each cleaning nozzle (6) includes a main housing (61), a first air jet (62), a second air jet (63), and an air inlet (64). The opening of the first air jet (62) faces obliquely upward and is used to clean the upper surface of the upper mold (22) and the plate (9). The opening of the second air jet (63) faces obliquely downward and is used to clean the lower surface of the lower mold (32) and the plate (9).

10. A variable speed stamping device with high torque as described in claim 1, characterized in that: The upper end of the main frame (1) is provided with a cover (81), and the cover (81) and the main frame (1) together form a cavity. The drive unit (4) is located in the cavity, and a heat dissipation pipe (82) is also provided in the cavity.

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