A high-precision laser cutting device for injection molds

Abstract

The application belongs to the technical field of laser cutting, and particularly relates to a high-precision laser cutting device for an injection mold, which comprises a laser cutting table, a laser cutting machine is installed on the laser cutting table, both sides of the inner side of the laser cutting table and below the laser cutting machine are provided with vacuum boxes, a box cover is clamped in the port at the top of the vacuum box, a plurality of support bodies which are flush with the top of the laser cutting table are connected to the top of the box cover, a plurality of first suction holes and a plurality of second suction holes are formed in each support body; in the application, negative pressure suction force is applied to the bottom of a blank, continuous suction force is applied to the blank during laser cutting, edge lifting caused by thermal stress is effectively offset, flatness and stability during blank cutting are ensured, large-aperture second suction holes are used for suction in a normal state, small-aperture suction is switched when abnormal vibration occurs, and uniform distribution of suction force is ensured through equal-porosity design.

Description

Technical Field

[0001] This invention belongs to the field of laser cutting technology, specifically a high-precision laser cutting device for injection molds. Background Technology

[0002] In the actual production process of injection molds, cutting devices play an indispensable role, and laser cutting is one of the most advanced methods. Whether it is the division and blanking of injection mold blanks, or the forming and processing of fine cooling channels, irregular inserts and demolding structures in the mold cavity, laser cutting can efficiently complete complex contours that are difficult to handle by traditional machining with the advantages of non-contact, low heat-affected zone, and no need for subsequent trimming. It can be said that laser cutting technology not only provides injection mold manufacturing with a high degree of freedom in forming methods, but also significantly shortens the injection mold development cycle, making mass production of high-precision, long-life injection molds possible. This allows injection molds, the "mother of industry," to better serve the precision manufacturing needs of various fields such as automobiles, electronics, and aerospace. The combination of the two has jointly promoted the continuous evolution of modern manufacturing towards a more efficient, more precise, and more intelligent direction.

[0003] Existing technologies disclose several invention patents in the field of laser cutting technology. Among them, invention patent CN118875525B discloses a mold laser cutting machine, belonging to the field of laser cutting machine technology. Through a lifting mechanism and a servo motor, when the servo motor rotates clockwise, the first transmission bevel gear, in conjunction with the first steering bevel gear, drives the first rotating rod to rotate. This causes the first rotating rod to drive the lifting gear to rotate inside the accommodating cavity, and in conjunction with the rack, pushes the lifting frame to move. The lifting frame causes the slider to slide and descend within a groove on the guide rail surface. Simultaneously, during the sliding process, the lifting frame presses down a hydraulic push rod through a connecting piece. The hydraulic push rod retracts, thereby driving the worktable rack to descend, and the servo motor rotates counterclockwise. When in motion, the lifting frame rises, and the hydraulic push rod provides support for the lifting frame, ensuring its stability during the ascent. Multiple worktable racks can be independently controlled for dispersed lifting. The height of the worktable racks can be flexibly adjusted according to specific processing requirements to adapt to workpieces of different heights and shapes. In the current process practice of high-precision laser cutting molds, the control of thermal stress is still significantly insufficient. The transient thermal gradient generated during the cutting process can induce stress redistribution within the material, leading to non-uniform warping in the edge area of ​​the blank. This thermally induced deformation not only directly destroys the geometric stability of the blank, but also seriously degrades the dimensional accuracy of laser cutting by changing the relative position of the focal point and the workpiece.

[0004] Based on this, the present invention designs a high-precision laser cutting device for injection molds to solve the above problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a high-precision laser cutting device for injection molds. This invention primarily addresses the significant deficiencies in thermal stress control during current high-precision laser cutting processes. The transient thermal gradient generated during cutting induces stress redistribution within the material, leading to non-uniform warping at the edges of the blank. This thermally induced deformation not only directly disrupts the geometric stability of the blank but also severely degrades the dimensional accuracy of laser cutting by altering the relative position of the focal point and the workpiece.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a high-precision laser cutting equipment for injection molds, including a laser cutting table, wherein a laser cutting machine is installed on the laser cutting table;

[0007] Vacuum boxes are provided on the inner side of the laser cutting table and on both sides below the laser cutting machine. A box cover is snapped into the port at the top of the vacuum box. Multiple support bodies are connected to the top of the box cover and are flush with the top of the laser cutting table. Each support body has multiple first suction holes and multiple second suction holes. The diameter of the first suction hole is smaller than the diameter of the second suction hole.

[0008] The inner wall of the vacuum box is slidably connected to a first carrier plate, and a plurality of first suction cylinders are connected to the first carrier plate. The plurality of first suction cylinders are respectively sleeved in the corresponding first suction hole. The outer wall of each first suction cylinder is provided with a first bridging hole, and the first bridging hole is located in the corresponding first suction hole. The first carrier plate is also provided with a first vent hole.

[0009] The inner wall of the vacuum box is also slidably connected to a second carrier plate, which is located below the first carrier plate. Multiple second suction cylinders are connected to the second carrier plate. Multiple sliding holes are opened on the first carrier plate corresponding to the multiple second suction cylinders. The top of each second suction cylinder passes through the corresponding sliding hole and is respectively set in the corresponding second suction hole. Multiple second vent holes are opened on the second carrier plate, and second bridging holes are opened on the outer wall of the second suction cylinder.

[0010] Preferably, a first electric cylinder is installed on both sides of the bottom of the vacuum box, and the telescopic ends of the two first electric cylinders are connected to the bottom of the second carrier plate. A first toothed plate is connected to both sides of the top of the second carrier plate, and a gear is meshed on the tooth surface of each first toothed plate. A wheel axle is rotatably connected to each of the two gears on the inner wall of the vacuum box. The gear is fixedly sleeved on one end of the wheel axle, and a second toothed plate is also meshed on each gear. The top of the second toothed plate is connected to the bottom of the first carrier plate.

[0011] Preferably, each of the vacuum boxes has a curved tube connected to the lower part of the second carrier plate inside it on its outer wall, and a vacuum tube is connected between the two curved tubes. A vacuum pump is provided on the inner side of the laser cutting stage, and the two curved tubes are connected to the output end of the vacuum pump through the vacuum tube. A vacuum regulating valve is installed on the vacuum tube.

[0012] Preferably, a first filter head is connected to the top of each first suction cylinder, a second filter head is snapped into the port at the top of each second suction cylinder, and a filter sleeve is snapped into the port at the top of each second suction hole. The top of the second suction cylinder is flush with the bottom of the filter sleeve. The inner diameter of the filter sleeve is equal to the outer diameter of the second suction cylinder, and the inner diameter of the second suction cylinder is equal to the inner diameter of the first suction cylinder.

[0013] Preferably, each vacuum box is equipped with a sensor, and the bottom of each vacuum box is connected to a pressure stabilizing cylinder. A pressure stabilizing plate is slidably connected to the inner wall of the pressure stabilizing cylinder. A sealing groove is formed on the circumferential surface of the pressure stabilizing plate, and a sealing ring is fitted onto the pressure stabilizing plate corresponding to the sealing groove. A second electric cylinder is installed on the inner wall of the pressure stabilizing cylinder, and the telescopic end of the second electric cylinder is connected to the bottom of the pressure stabilizing plate.

[0014] Preferably, each of the vacuum boxes has two symmetrically arranged linear modules installed on its side. Each linear module is slidably connected to a sliding seat, and a connecting rod is connected to the sliding seat. The other end of the connecting rod is connected to a sealing strip, and the sealing strip is slidably connected to the top of its corresponding plurality of supports.

[0015] Preferably, each vacuum box is provided with a take-up roller on both the front and rear sides, and an adapter shaft is snapped into the inner side of the take-up roller. Both ends of the adapter shaft are rotatably connected to a first adapter frame, which is connected to the vacuum box. A rubber strip is wound around the take-up roller, and the other end of the rubber strip is connected to a sealing strip.

[0016] A coil spring is fitted on the adapter shaft, and the adapter shaft forms an elastic connection with the first adapter frame through the coil spring.

[0017] Preferably, the rubber strip at the top edge of the vacuum box is configured with a rounded corner structure, and a pressure roller is rotatably connected to the top of the rubber strip. Both ends of the pressure roller are rotatably connected to a second adapter frame, which is connected to the vacuum box.

[0018] Preferably, a stationary turntable is snapped onto the inner wall of each of the bends, and a plurality of first air holes are opened on the stationary turntable in a circular array. A movable turntable is rotatably connected to the inner wall of the bend corresponding to the end face of the stationary turntable, and a plurality of second air holes are opened on the movable turntable corresponding to the plurality of first air holes.

[0019] A motor is installed on the outer wall of the bend, and a drive shaft is rotatably connected to the outer wall of the bend corresponding to the motor. One end of the drive shaft is connected to the output end of the motor, and the other end of the drive shaft is connected to the rotating disc.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. In this invention, by applying negative pressure suction to the bottom of the blank, a continuous adsorption force is applied to the blank during the laser cutting process, which effectively counteracts the edge warping caused by thermal stress and ensures the flatness and stability of the blank during the cutting process. Under normal conditions, a large-diameter second suction hole is used for adsorption, and when there is abnormal shaking, it is switched to small-diameter adsorption. The equal opening ratio design ensures that the adsorption force is evenly distributed, avoiding local over-adsorption or insufficient adsorption.

[0022] 2. In this invention, the second carrier plate is driven upward by the first electric cylinder, and the first carrier plate is driven downward by the mechanical linkage of the first toothed plate, the gear, and the second toothed plate, so as to realize the coordinated action of the first suction cylinder and the second suction cylinder. The switching process does not require an additional control unit, and the structure is compact and the response is rapid.

[0023] 3. In this invention, under normal conditions, the filter sleeve works in conjunction with the second filter head for filtration. When there is abnormal shaking, the first filter head and the second filter head filter their respective air paths to ensure that all airflow entering the negative pressure system under different modes is filtered, effectively intercepting smoke and slag, and protecting the vacuum pump and pipelines.

[0024] 4. In this invention, the sensor monitors the negative pressure value of the vacuum box in real time, and the system controls the second electric cylinder to drive the pressure stabilizing plate to move in both directions, forming a closed-loop control, which timely compensates for or releases the negative pressure, and avoids negative pressure fluctuations caused by changes in airflow, switching of suction holes or material obstruction. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a top-view schematic diagram of the planar structure of the laser cutting stage in this invention;

[0028] Figure 3 This is a three-dimensional structural diagram of the laser cutting table as viewed from below in this invention;

[0029] Figure 4 This is a schematic diagram of the vacuum box structure in this invention;

[0030] Figure 5 This is the present invention. Figure 4 Schematic diagram of the cross-sectional structure in the middle;

[0031] Figure 6This is the present invention. Figure 4 A schematic diagram of the planar structure in cross-section at the middle gear;

[0032] Figure 7 This is the present invention. Figure 4 A schematic diagram of the structure after splitting it into parts;

[0033] Figure 8 This is the present invention. Figure 7 Schematic diagram of the middle box lid;

[0034] Figure 9 This is the present invention. Figure 7 A schematic diagram of the structure of the first carrier plate;

[0035] Figure 10 This is the present invention. Figure 7 Schematic diagram of the structure of the second carrier plate;

[0036] Figure 11 This is the present invention. Figure 5 Enlarged structural diagram at point A in the middle.

[0037] In the diagram: 1. Laser cutting stage; 2. Second bridging hole; 3. Laser cutting machine; 4. Vacuum box; 5. Box cover; 6. Support body; 7. First suction hole; 8. Second suction hole; 9. First carrier plate; 10. First suction cylinder; 11. First bridging hole; 12. First vent hole; 13. Second carrier plate; 14. Second suction cylinder; 15. Second vent hole; 16. Sliding joint hole; 17. Axle; 18. Gear; 19. First gear plate; 20. Second gear plate; 21. First electric cylinder; 22. First filter head; 23. Filter sleeve; 24. Second filter head; 5. Pressure stabilizing cylinder; 26. Sensor; 27. Pressure stabilizing plate; 28. Sealing ring; 29. ​​Second electric cylinder; 30. Bending pipe; 31. Stationary turntable; 32. First air hole; 33. Moving turntable; 34. Second air hole; 35. Drive shaft; 36. Motor; 37. Linear module; 38. Sliding seat; 39. Connecting rod; 40. Sealing strip; 41. First adapter frame; 42. Adapter shaft; 43. Take-up roller; 44. Coil spring; 45. Rubber belt; 46. Pressure roller; 47. Second adapter frame; 48. Vacuum tube; 49. Vacuum regulating valve; 50. Vacuum pump. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] like Figures 1 to 11 As shown, a high-precision laser cutting device for injection molds includes a laser cutting table 1, on which a laser cutting machine 3 is mounted;

[0040] Vacuum boxes 4 are provided on both sides of the inner side of the laser cutting table 1 and below the laser cutting machine 3. A box cover 5 is snapped into the port at the top of the vacuum box 4. Multiple support bodies 6 that are flush with the top of the laser cutting table 1 are connected to the top of the box cover 5. Multiple first suction holes 7 and multiple second suction holes 8 are provided on each support body 6. The diameter of the first suction hole 7 is smaller than the diameter of the second suction hole 8.

[0041] The inner wall of the vacuum box 4 is slidably connected to a first carrier plate 9. Multiple first suction cylinders 10 are connected to the first carrier plate 9. The multiple first suction cylinders 10 are respectively sleeved in the corresponding first suction hole 7. Each first suction cylinder 10 has a first bridging hole 11 on its outer wall, and the first bridging hole 11 is located in the corresponding first suction hole 7. The first carrier plate 9 also has a first vent hole 12.

[0042] The inner wall of the vacuum box 4 is also slidably connected to a second carrier plate 13. The second carrier plate 13 is located below the first carrier plate 9. Multiple second suction cylinders 14 are connected to the second carrier plate 13. Multiple sliding holes 16 are opened on the first carrier plate 9 corresponding to the multiple second suction cylinders 14. The top of each second suction cylinder 14 passes through the corresponding sliding hole 16 and is respectively set in the corresponding second suction hole 8. Multiple second vent holes 15 are opened on the second carrier plate 13. Second bridging holes 2 are opened on the outer wall of the second suction cylinder 14.

[0043] A first electric cylinder 21 is installed on both sides of the bottom of the vacuum box 4. The telescopic ends of the two first electric cylinders 21 are connected to the bottom of the second carrier plate 13. A first toothed plate 19 is connected to both sides of the top of the second carrier plate 13. A gear 18 is meshed on the tooth surface of each first toothed plate 19. A wheel axle 17 is rotatably connected to each of the two gears 18 on the inner wall of the vacuum box 4. The gear 18 is fixedly sleeved on one end of the wheel axle 17. A second toothed plate 20 is also meshed on each gear 18. The top of the second toothed plate 20 is connected to the bottom of the first carrier plate 9.

[0044] Each vacuum box 4 has a bend 30 connected to the lower part of the second carrier plate 13 on its outer wall. A vacuum tube 48 is connected between the two bends 30. A vacuum pump 50 is installed inside the laser cutting table 1. The two bends 30 are connected to the output end of the vacuum pump 50 through the vacuum tube 48. A vacuum regulating valve 49 is installed on the vacuum tube 48.

[0045] This embodiment is as follows: The blank is placed on the laser cutting table 1, and then laser cutting is performed by the laser cutting machine 3. Laser cutting generates thermal stress, which can easily cause the edges of the blank to warp during the cutting process, reducing the processing accuracy of the laser cutting. The vacuum pump 50 is controlled to operate. The vacuum pump 50 simultaneously extracts air from the two vacuum boxes 4 through the vacuum tube 48 and two bent tubes 30. As the vacuum pump 50 continues to work, the two vacuum boxes 4 gradually approach a negative pressure state. During this process, the air in the first suction hole 7 and the second suction hole 8 flows to the bent tube 30 through the multiple first vent holes 12 on the first carrier plate 9 and the multiple second vent holes 15 on the second carrier plate 13, and then the negative pressure is drawn in through the multiple first suction holes 7 and the second suction holes 8. Force is applied to the blank at the top of the support body 6. Multiple first suction cylinders 10 are located in multiple first suction holes 7, and the first bridging holes 11 on the first suction cylinders 10 are located in the first suction holes 7, that is, the multiple first suction holes 7 are in a blocked state. At the same time, multiple second suction cylinders 14 are located in multiple second suction holes 8, and the top of the second suction cylinders 14 is flush with the bottom of the filter sleeve 23. Since the diameter of the second suction cylinders 14 is larger than the diameter of the first suction holes 7, under normal laser cutting conditions, the negative pressure suction force is applied to the bottom of the blank by the multiple second suction holes 8 with larger diameters. During this process, the filter sleeve 23 and the second filter head 24 complete the air filtration. When the blank vibrates abnormally during laser cutting, the two first electric cylinders 21 are controlled to extend. The second electric cylinder 29 pushes the second carrier plate 13 upward, causing the second carrier plate 13 to drive multiple second suction cylinders 14 upward until the top of the second suction cylinders 14 is level with the top of the support body 6. During the upward movement, the second carrier plate 13 simultaneously drives the first toothed plate 19 upward. The first toothed plate 19 drives the gear 18 to rotate through the wheel axle 17, generating a downward thrust on the second toothed plate 20. The two second toothed plates 20 pull the first carrier plate 9 downward. As the first carrier plate 9 moves downward, it drives multiple first suction cylinders 10 to slide down into multiple first suction holes 7, until the first bridging hole 11 on the first suction cylinder 10 disengages from the first suction hole 7. At this point, the multiple first suction cylinders 10 and multiple second suction cylinders 14 together exert negative pressure suction on the bottom of the blank, and the multiple first suction cylinders 10 and multiple second suction cylinders 14... The combination of the first suction holes 7 and the multiple second suction cylinders 14 have the same inner diameter opening ratio. By adsorbing the bottom of the blank through negative pressure, a continuous adsorption force is applied to the blank during laser cutting, effectively counteracting edge warping caused by thermal stress and ensuring the flatness and stability of the blank. Under normal conditions, the large-diameter second suction holes 8 are used for adsorption, providing sufficient adsorption force while reducing airflow speed. In case of abnormal vibration, the adsorption force is switched to a combination of large and small diameter holes. The equal opening ratio design ensures uniform distribution of adsorption force, avoiding local over-adsorption or insufficient adsorption. The first electric cylinder 21 drives the second carrier plate 13 to move upward, while the first carrier plate 9 moves downward through the mechanical linkage of the first toothed plate 19, gear 18, and second toothed plate 20, realizing the coordinated action of the first suction cylinder 10 and the second suction cylinder 14.The switching process requires no additional control unit, featuring a compact structure and rapid response. The filter sleeve 23 works in conjunction with the second filter head 24 to filter the air entering the suction hole and suction cylinder, effectively intercepting metal dust and slag generated during laser cutting. This protects the vacuum pump 50 and piping system, extending the equipment's lifespan. Whether using a large-diameter suction hole alone or a combination of large and small diameter holes, the overall porosity remains consistent, ensuring a smooth transition of adsorption force in different modes of the negative pressure system. This avoids localized deformation of the blank or adsorption failure due to sudden changes in porosity. By eliminating material vibration and warping, the laser cutting head maintains a stable processing gap, thereby improving the neatness and dimensional accuracy of the cutting boundary and reducing the scrap rate.

[0046] Specifically, a first filter head 22 is connected to the top of each first suction cylinder 10, a second filter head 24 is snapped into the port at the top of each second suction cylinder 14, and a filter sleeve 23 is snapped into the port at the top of each second suction hole 8. The top of the second suction cylinder 14 is flush with the bottom of the filter sleeve 23. The inner diameter of the filter sleeve 23 is equal to the outer diameter of the second suction cylinder 14, and the inner diameter of the second suction cylinder 14 is equal to the inner diameter of the first suction cylinder 10.

[0047] Specifically, in this embodiment: when the blank is in the laser cutting process, multiple large-diameter second suction holes 8 apply negative pressure suction to the bottom of the blank. During this process, the filter sleeve 23 and the second filter head 24 complete air filtration. When the blank experiences abnormal vibration during laser cutting, multiple first suction cylinders 10 and multiple second suction cylinders 14 jointly apply negative pressure suction to the bottom of the blank. The second suction holes 8 are filtered by the second filter head 24, and the first suction holes 7 are filtered by the first filter head 22. This effectively prevents the smoke and dust generated by laser cutting from flowing to the vacuum pump 50. Under normal conditions, only the second suction holes 8 need to work, and the filter sleeve 23 and the second filter head 24 complete the filtration. When there is abnormal vibration, the first suction holes 7 and the second suction holes 8 are filtered by the second filter head 24. 8. Working simultaneously, the first filter head 22 and the second filter head 24 filter their respective air paths to ensure that the filtration requirements in different modes are met. All airflow entering the negative pressure system is filtered to effectively intercept the smoke and slag generated by laser cutting, preventing them from entering the vacuum pump 50, reducing equipment wear and failure rate. The filter prevents dust from clogging the first suction hole 7, the second suction hole 8, the first suction cylinder 10, the second suction cylinder 14 and the bridging hole, keeping the airflow channel unobstructed. This ensures that the negative pressure system can stably output adsorption force in different switching states, avoiding adsorption failure due to blockage. By effectively intercepting smoke and dust, the spread of dust in the cutting area is reduced, the working environment is improved, and the risk of smoke and dust contaminating the optical lens of the laser cutting head is reduced.

[0048] Specifically, each vacuum box 4 is equipped with a sensor 26, and the bottom of each vacuum box 4 is connected to a pressure stabilizing cylinder 25. A pressure stabilizing plate 27 is slidably connected to the inner wall of the pressure stabilizing cylinder 25. A sealing groove is opened on the circumferential surface of the pressure stabilizing plate 27, and a sealing ring 28 is fitted on the pressure stabilizing plate 27 corresponding to the sealing groove. A second electric cylinder 29 is installed on the inner wall of the pressure stabilizing cylinder 25, and the telescopic end of the second electric cylinder 29 is connected to the bottom of the pressure stabilizing plate 27.

[0049] Specifically, in this embodiment, sensor 26 is used to monitor the negative pressure environment inside the vacuum box 4 in real time. When the negative pressure value inside the vacuum box 4 fluctuates, the system controls the second electric cylinder 29 to make a corresponding extension and retraction movement.

[0050] When the negative pressure value decreases, the system controls the second electric cylinder 29 to retract, thereby pulling the pressure stabilizing plate 27 downward to increase the negative pressure value in the vacuum box 4.

[0051] When the negative pressure increases, the system controls the second electric cylinder 29 to extend, thereby pushing the pressure stabilizing plate 27 upward and reducing the negative pressure in the vacuum box 4.

[0052] The system controls the second electric cylinder 29 to react quickly and stabilize the vacuum environment inside the vacuum box 4, thereby providing a stable negative pressure suction to the bottom of the blank, thus improving the stability of the blank during the laser cutting process. The sensor 26 continuously monitors the negative pressure state inside the vacuum box 4. The system drives the second electric cylinder 29 in real time according to the feedback signal to form a closed-loop control, ensuring that the negative pressure value is always maintained within the set range. The retraction pulls the pressure stabilizing plate 27 downward to increase the negative pressure, and the extension pushes the pressure stabilizing plate 27 upward to decrease the negative pressure. It can effectively deal with the fluctuations in the negative pressure in two different directions, such as the decrease or increase. The system controls the second electric cylinder 29 to react quickly and compensate or release the negative pressure in time, avoiding the violent fluctuations in negative pressure caused by changes in airflow, switching of suction holes or material obstruction during the cutting process. The stable negative pressure environment provides a continuous and uniform suction force to the bottom of the blank, effectively suppressing material vibration and warping, thereby improving the stability and processing accuracy of the blank during the laser cutting process.

[0053] Specifically, each vacuum box 4 has two symmetrically arranged linear modules 37 installed on its side. Each linear module 37 is slidably connected to a sliding seat 38. A connecting rod 39 is connected to the sliding seat 38. The other end of the connecting rod 39 is connected to a sealing strip 40. The sealing strip 40 is slidably connected to the top of its corresponding multiple supports 6.

[0054] Specifically, this embodiment involves adjusting the spacing between the two sealing strips 40 relative to each other according to the width of the blank, controlled by the system linear module 37. This allows the blank to be conveyed between the two sealing strips 40. On one hand, this limits the placement of the blank on the laser cutting table 1. On the other hand, it seals the two sides of the blank, thereby improving the stability of the negative pressure adsorption at the bottom. The spacing between the two sealing strips 40 can be flexibly adjusted according to the actual width of the blank, allowing the device to adapt to blanks of different widths and improving the equipment's versatility. The two sealing strips 40 physically limit the two sides of the blank, ensuring precise alignment between the laser cutting trajectory and the material edge. The sealing strips 40 are close to the two sides of the blank, blocking and sealing the open area at the top of the support 6, reducing the entry of outside air into the negative pressure area from the two sides of the material, thereby reducing the load on the vacuum pump 50 and improving the negative pressure adsorption efficiency. By reducing air leakage through side sealing, the bottom of the blank obtains a more uniform and stable negative pressure adsorption force, effectively suppressing material vibration and warping, and thus improving the precision and surface quality of laser cutting.

[0055] Specifically, each vacuum box 4 is provided with a take-up roller 43 on both the front and rear sides. The inner side of the take-up roller 43 is snapped with an adapter shaft 42. Both ends of the adapter shaft 42 are rotatably connected to a first adapter frame 41. The first adapter frame 41 is connected to the vacuum box 4. A rubber belt 45 is wound and connected on the take-up roller 43. The other end of the rubber belt 45 is connected to the sealing strip 40.

[0056] A coil spring 44 is fitted on the adapter shaft 42, and the adapter shaft 42 and the first adapter frame 41 are elastically connected through the coil spring 44.

[0057] The top edge of the vacuum box 4 is equipped with a rounded corner structure corresponding to the rubber belt 45. The top of the rubber belt 45 is connected to a pressure roller 46, and both ends of the pressure roller 46 are rotatably connected to a second adapter frame 47, which is connected to the vacuum box 4.

[0058] In this embodiment, the sealing strip 40 slides on the top of the support body 6, generating tension on the rubber strip 45. Under this tension, more of the rubber strip 45 disengages from the take-up roller 43, causing the take-up roller 43 to rotate. During this process, the take-up roller 43 drives the coil spring 44 to undergo elastic deformation via the adapter shaft 42. When the sealing strip 40 moves in the opposite direction, the take-up roller 43 moves in the opposite direction under the action of the return elastic force of the coil spring 44, thereby winding up the rubber strip 45. During the sliding of the rubber strip 45 on the top of the support body 6, it can seal multiple first suction holes 7 and second suction holes 8 on both sides of the blank. The tension generated when the sealing strip 40 slides automatically controls the release amount of the rubber strip 45. The greater the sliding distance, the more is unwound. No additional driving element is required, realizing mechanically adaptive follow-up unwinding. During the unwinding process, the coil spring 44 stores energy through the elastic deformation of the adapter shaft 42. When the sealing strip 40 moves in the opposite direction, the coil spring 44 resets and releases its elastic force, driving the take-up roller 43 to rotate in the opposite direction, thereby achieving automatic take-up of the rubber belt 45. This ensures that the rubber belt 45 remains taut when the sealing strip 40 moves in both directions. The rubber belt 45 slides synchronously with the sealing strip 40, sealing the multiple first suction holes 7 and second suction holes 8 on both sides of the blank that are not covered by material in real time. This effectively reduces the amount of outside air entering the negative pressure system through the suction holes, reduces the load on the vacuum pump 50, and improves the negative pressure adsorption efficiency. The unwinding and take-up processes are completed entirely by the moving tension of the sealing strip 40 and the reset elastic force of the coil spring 44. There is no need to configure an independent motor 36 or pneumatic components, which simplifies the equipment structure and reduces manufacturing costs and control complexity.

[0059] Specifically, each bend 30 has a stationary turntable 31 attached to its inner wall. The stationary turntable 31 has multiple first air holes 32 arranged in a ring array. The inner wall of the bend 30 is rotatably connected to a moving turntable 33 corresponding to the end face of the stationary turntable 31. The moving turntable 33 has multiple second air holes 34 corresponding to the multiple first air holes 32.

[0060] A motor 36 is installed on the outer wall of the bend 30. A drive shaft 35 is rotatably connected to the outer wall of the bend 30 corresponding to the motor 36. One end of the drive shaft 35 is connected to the output end of the motor 36, and the other end of the drive shaft 35 is connected to the rotating disk 33.

[0061] Specifically, this embodiment involves connecting a vacuum tube 48 to a blower, which injects high-pressure airflow into the vacuum chamber 4 to reverse-flush the first filter head 22, the second filter head 24, and the filter sleeve 23. During this process, a motor 36 is controlled to operate, and its output drives a rotating disk 33 via a transmission shaft 35. As the rotating disk 33 rotates, its multiple second air holes 34 periodically communicate with and misalign with the multiple first air holes 32 on the stationary disk 31, generating a pulsed airflow. This pulsed airflow is then injected into the vacuum chamber 4 by the blower, reversibly purifying the first filter head 22, the second filter head 24, and the filter sleeve 23. This removes dust and slag adhering to the filter structure surface without disassembly, achieving continuous online cleaning. The rotating disk 33 and the stationary disk... The relative rotation of 31 causes the second air hole 34 and the first air hole 32 to periodically open and close, converting the continuous high-pressure airflow into a pulsed airflow. The pulsed airflow has instantaneous impact characteristics, which can more effectively remove stubborn dust adhering to the depth and surface of the first filter head 22, the second filter head 24 and the filter sleeve 23. The cleaning effect is better than that of continuous airflow. The rotating disk 33 is driven by the motor 36 to rotate, and the pulsed airflow is generated by the periodic misalignment of the air holes. The structure is simple and the response is direct. There is no need for a complex electronic pulse control valve, which reduces manufacturing and maintenance costs. Periodic reverse pulse cleaning can effectively prevent the first filter head 22, the second filter head 24 and the filter sleeve 23 from clogging, reduce airflow resistance, and keep the negative pressure value in the vacuum box 4 stable, thereby ensuring the continuous reliability of the adsorption force at the bottom of the blank and reducing the negative pressure attenuation caused by clogging.

[0062] During operation, the blank is placed on the laser cutting table 1 and then laser cutting is completed by the laser cutting machine 3. Laser cutting generates thermal stress, which can easily cause the edges of the blank to curl up during the cutting process. This not only affects the stability of the blank but also reduces the processing accuracy of laser cutting.

[0063] The vacuum pump 50 is controlled to operate. The vacuum pump 50 simultaneously extracts air from the two vacuum boxes 4 through the vacuum tube 48 and the two bent tubes 30. As the vacuum pump 50 continues to work, the two vacuum boxes 4 gradually approach a negative pressure state. During this process, the air in the first suction hole 7 and the second suction hole 8 flows to the bent tube 30 through the multiple first vent holes 12 on the first carrier plate 9 and the multiple second vent holes 15 on the second carrier plate 13. Then, the negative pressure suction is applied to the blank on the top of the support body 6 through the multiple first suction holes 7 and the second suction holes 8.

[0064] When the blank is placed on top of the two sets of supports 6, multiple first suction cylinders 10 are respectively located in multiple first suction holes 7, and the first bridging hole 11 on the first suction cylinder 10 is located in the first suction hole 7, that is, multiple first suction holes 7 are in a blocked state. At the same time, multiple second suction cylinders 14 are respectively located in multiple second suction holes 8, and the top of the second suction cylinder 14 is flush with the bottom of the filter sleeve 23. Since the aperture of the second suction cylinder 14 is larger than the aperture of the first suction hole 7, when the blank is in a laser cutting process, the negative pressure suction force is applied to the bottom of the blank by the multiple second suction holes 8 with large apertures. During this process, the filter sleeve 23 and the second filter head 24 complete the air filtration.

[0065] When the blank experiences abnormal vibration during laser cutting, the two first electric cylinders 21 are controlled to extend, and the second electric cylinder 29 pushes the second carrier plate 13 upward. The second carrier plate 13 drives multiple second suction cylinders 14 upward until the top of the second suction cylinders 14 is level with the top of the support body 6. During the upward movement, the second carrier plate 13 simultaneously drives the first toothed plate 19 upward. The first toothed plate 19 drives the gear 18 to rotate through the wheel shaft 17 and generates a downward thrust on the second toothed plate 20. The two second toothed plates 20 pull the first carrier plate 9 downward. As the first carrier plate 9 moves downward, it drives multiple first suction cylinders 10 to slide down into multiple first suction holes 7 respectively until the first bridging hole 11 on the first suction cylinder 10 disengages from the first suction hole 7. At this time, the multiple first suction cylinders 10 and multiple second suction cylinders 14 together exert negative pressure suction on the bottom of the blank, and the combination of multiple first suction cylinders 10 and multiple first suction holes 7 is equal to the inner diameter opening ratio of multiple second suction cylinders 14.

[0066] By applying a negative pressure to the bottom of the blank, a continuous adsorption force is applied to the blank during laser cutting, effectively counteracting edge warping caused by thermal stress and ensuring the flatness and stability of the blank. Under normal conditions, the large-diameter second suction hole 8 is used for adsorption, providing sufficient adsorption force while reducing airflow speed. In case of abnormal vibration, it switches to adsorption with a combination of large and small diameter holes. The equal opening ratio design ensures uniform distribution of adsorption force, avoiding local over-adsorption or insufficient adsorption. The first electric cylinder 21 drives the second carrier plate 13 to move upward, while the first toothed plate 19, gear 18, and second toothed plate 20 mechanically drive the first carrier plate 9 to move downward, realizing the connection between the first suction cylinder 10 and the second suction cylinder 13. The coordinated action of the cylinder 14, the filter sleeve 23 and the second filter head 24 work together to filter the air entering the suction hole and suction cylinder, effectively intercepting metal dust and slag generated by laser cutting, protecting the vacuum pump 50 and the pipeline system, and extending the service life of the equipment. Whether using large-diameter suction holes alone or combining large and small-diameter suction, the overall porosity remains consistent, ensuring a smooth transition of the suction force of the negative pressure system in different modes, avoiding local deformation of the blank or suction failure caused by sudden changes in porosity. By eliminating material vibration and warping, the laser cutting head always maintains a stable processing gap, thereby improving the neatness and dimensional accuracy of the cutting boundary and reducing the scrap rate.

[0067] When the blank is in the laser cutting process, multiple large-diameter second suction holes 8 apply negative pressure suction to the bottom of the blank. During this process, the filter sleeve 23 and the second filter head 24 complete air filtration. When the blank experiences abnormal vibration during laser cutting, multiple first suction cylinders 10 and multiple second suction cylinders 14 jointly apply negative pressure suction to the bottom of the blank. The second suction hole 8 is filtered by the second filter head 24, and the first suction hole 7 is filtered by the first filter head 22. This effectively prevents the smoke and dust generated by laser cutting from flowing to the vacuum pump 50. Under normal conditions, only the second suction hole 8 needs to work, and the filter sleeve 23 and the second filter head 24 complete the filtration. When there is abnormal vibration, the first suction hole 7 and the second suction hole 8 work simultaneously. The first filter head 22 and the second filter head 24 filter their respective air paths to ensure that the filtration requirements in different modes are met. All airflow entering the negative pressure system is filtered to effectively intercept the smoke and slag generated by laser cutting, preventing them from entering the vacuum pump 50, reducing equipment wear and failure rate. The filter structure prevents dust from clogging the first suction hole 7, the second suction hole 8, the first suction cylinder 10, the second suction cylinder 14 and the bridging hole, keeping the airflow channel unobstructed and ensuring that the negative pressure system can stably output adsorption force in different switching states, avoiding adsorption failure due to blockage. By effectively intercepting smoke and dust, the spread of dust in the cutting area is reduced, the working environment is improved, and the risk of smoke and dust contaminating the optical lens of the laser cutting head is reduced.

[0068] Sensor 26 is used to monitor the negative pressure environment inside the vacuum chamber 4 in real time. When the negative pressure value inside the vacuum chamber 4 fluctuates, the system controls the second electric cylinder 29 to make corresponding extension and retraction movements: when the negative pressure value decreases, the system controls the second electric cylinder 29 to retract, thereby pulling the pressure stabilizing plate 27 downward to increase the negative pressure value inside the vacuum chamber 4; when the negative pressure value increases, the system controls the second electric cylinder 29 to extend, thereby pushing the pressure stabilizing plate 27 upward to decrease the negative pressure value inside the vacuum chamber 4. By controlling the second electric cylinder 29 to react quickly, the system stabilizes the vacuum environment inside the vacuum chamber 4, thereby providing a stable negative pressure suction force to the bottom of the blank, thus improving the stability of the blank during the laser cutting process. Sensor 26 holds... The system continuously monitors the negative pressure state inside the vacuum box 4. Based on the feedback signal, the system drives the second electric cylinder 29 in real time to form a closed-loop control, ensuring that the negative pressure value is always maintained within the set range. The system retracts and pulls the pressure stabilizing plate 27 downward to increase the negative pressure, and extends and pushes the pressure stabilizing plate 27 upward to decrease the negative pressure. This can effectively cope with fluctuations in the negative pressure in two different directions, such as decrease or increase. The system controls the second electric cylinder 29 to make a rapid response, compensate for or release the negative pressure in a timely manner, and avoid drastic fluctuations in negative pressure caused by changes in airflow, switching of suction holes or material obstruction during the cutting process. The stable negative pressure environment provides a continuous and uniform adsorption force for the bottom of the blank, effectively suppressing material vibration and warping, thereby improving the stability and processing accuracy of the blank during the laser cutting process.

[0069] Based on the width of the blank, the system controls the linear module 37 to adjust the spacing between the two sealing strips 40, allowing the blank to be conveyed between the two sealing strips 40. On the one hand, this limits the placement of the blank on the laser cutting table 1, and on the other hand, it seals the two sides of the blank, thereby improving the stability of its bottom negative pressure adsorption. The spacing between the two sealing strips 40 can be flexibly adjusted according to the actual width of the blank, so that the device can adapt to blanks of different widths without replacing parts, thus improving the equipment's versatility. The two sealing strips 40 form a physical limit on both sides of the blank, ensuring the precise alignment of the laser cutting trajectory with the material edge. The sealing strips 40 are close to the two sides of the blank, blocking and sealing the open area at the top of the support 6, reducing the entry of outside air into the negative pressure area from both sides of the material, thereby reducing the load on the vacuum pump 50 and improving the negative pressure adsorption efficiency. By reducing air leakage through side sealing, the bottom of the blank obtains a more uniform and stable negative pressure adsorption force, effectively suppressing material vibration and warping, thereby improving the precision and surface quality of laser cutting.

[0070] During the sliding process of the sealing strip 40 on the top of the support body 6, it generates tension on the rubber strip 45. Under the action of tension, more of the rubber strip 45 is released from the take-up roller 43, driving the take-up roller 43 to rotate. During this process, the take-up roller 43 drives the coil spring 44 to undergo elastic deformation through the adapter shaft 42. When the sealing strip 40 moves in the opposite direction, the take-up roller 43 moves in the opposite direction under the action of the return elastic force of the coil spring 44, thereby winding up the rubber strip 45. During the sliding process of the rubber strip 45 on the top of the support body 6, it can seal multiple first suction holes 7 and second suction holes 8 on both sides of the blank. The tension generated when the sealing strip 40 slides automatically controls the release amount of the rubber strip 45. The greater the sliding distance, the more is unwound. No additional driving element is required, realizing mechanically adaptive follow-up unwinding. The coil spring 44 stores energy through elastic deformation via the adapter shaft 42. When the sealing strip 40 moves in the opposite direction, the coil spring 44 resets and releases its elastic force, driving the take-up roller 43 to rotate in the opposite direction, thereby achieving automatic take-up of the rubber belt 45. This ensures that the rubber belt 45 remains taut when the sealing strip 40 moves in both directions. The rubber belt 45 slides synchronously with the sealing strip 40, sealing multiple first suction holes 7 and second suction holes 8 on both sides of the blank that are not covered by material in real time. This effectively reduces the amount of outside air entering the negative pressure system through the suction holes, reduces the load on the vacuum pump 50, and improves the negative pressure adsorption efficiency. The unwinding and rewinding processes are completed entirely by the moving tension of the sealing strip 40 and the reset elastic force of the coil spring 44. There is no need to configure an independent motor 36 or pneumatic components, which simplifies the equipment structure and reduces manufacturing costs and control complexity.

[0071] The vacuum tube 48 is connected to a blower, which injects high-pressure airflow into the vacuum box 4 to reverse-flush the first filter head 22, the second filter head 24, and the filter sleeve 23. During this process, the motor 36 is controlled to run, and the output end of the motor 36 drives the rotating disk 33 to rotate via the transmission shaft 35. During the rotation of the rotating disk 33, multiple second air holes 34 on it periodically communicate with and misalign with multiple first air holes 32 on the stationary disk 31, thereby generating a pulse airflow. The blower injects high-pressure airflow into the vacuum box 4 to reverse-flush the first filter head 22, the second filter head 24, and the filter sleeve 23. Dust and slag adhering to the surface of the filter structure can be removed without disassembly, achieving online cleaning without stopping the machine. The relative positions of the rotating disk 33 and the stationary disk 31... Rotation causes the second air hole 34 to periodically open and close with the first air hole 32, converting the continuous high-pressure airflow into a pulsed airflow. The pulsed airflow has instantaneous impact characteristics, which can more effectively remove stubborn dust adhering to the depths and surfaces of the first filter head 22, the second filter head 24, and the filter sleeve 23. The cleaning effect is better than that of continuous airflow. The rotating disk 33 is driven by the motor 36 to rotate, and the pulsed airflow is generated by the periodic misalignment of the air holes. The structure is simple and the response is direct. There is no need for a complex electronic pulse control valve, which reduces manufacturing and maintenance costs. Periodic reverse pulse cleaning can effectively prevent the first filter head 22, the second filter head 24, and the filter sleeve 23 from clogging, reduce airflow resistance, and keep the negative pressure value in the vacuum box 4 stable, thereby ensuring the continuous reliability of the adsorption force at the bottom of the blank and reducing the negative pressure attenuation caused by clogging.

[0072] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A high-precision laser cutting device for injection molds, comprising a laser cutting table (1), wherein a laser cutting machine (3) is mounted on the laser cutting table (1), characterized in that: Vacuum boxes (4) are provided on the inner side of the laser cutting table (1) and on both sides below the laser cutting machine (3). A box cover (5) is snapped into the port at the top of the vacuum box (4). Multiple support bodies (6) that are flush with the top of the laser cutting table (1) are connected to the top of the box cover (5). Each support body (6) has multiple first suction holes (7) and multiple second suction holes (8). The diameter of the first suction hole (7) is smaller than the diameter of the second suction hole (8). The inner wall of the vacuum box (4) is slidably connected to a first carrier plate (9), and a plurality of first suction cylinders (10) are connected to the first carrier plate (9). The plurality of first suction cylinders (10) are respectively sleeved in the corresponding first suction hole (7). The outer wall of each first suction cylinder (10) is provided with a first bridging hole (11), and the first bridging hole (11) is located in the corresponding first suction hole (7). The first carrier plate (9) is also provided with a first vent hole (12). The inner wall of the vacuum box (4) is also slidably connected to a second carrier plate (13). The second carrier plate (13) is located below the first carrier plate (9). Multiple second suction cylinders (14) are connected to the second carrier plate (13). Multiple sliding holes (16) are opened on the first carrier plate (9) corresponding to the multiple second suction cylinders (14). The top of each second suction cylinder (14) passes through the corresponding sliding hole (16) and is respectively set in the corresponding second suction hole (8). Multiple second vent holes (15) are opened on the second carrier plate (13). A second bridging hole (2) is opened on the outer wall of the second suction cylinder (14).

2. The high-precision laser cutting equipment for injection molds according to claim 1, characterized in that: The vacuum box (4) has two first electric cylinders (21) installed on both sides of its bottom. The telescopic ends of the two first electric cylinders (21) are connected to the bottom of the second carrier plate (13). The top of the second carrier plate (13) has two first toothed plates (19) connected to both sides. Each toothed plate (19) has a gear (18) meshing on its tooth surface. The inner wall of the vacuum box (4) is rotatably connected to the two gears (18) with a wheel axle (17). The gear (18) is fixedly sleeved on one end of the wheel axle (17), and each gear (18) is also meshed with a second toothed plate (20). The top of the second toothed plate (20) is connected to the bottom of the first carrier plate (9).

3. The high-precision laser cutting equipment for injection molds according to claim 2, characterized in that: Each of the vacuum boxes (4) has a bend (30) connected to the lower part of the second carrier plate (13) inside it on the outer wall. A vacuum tube (48) is connected between the two bends (30). A vacuum pump (50) is provided on the inner side of the laser cutting table (1). The two bends (30) are connected to the output end of the vacuum pump (50) through the vacuum tube (48). A vacuum regulating valve (49) is installed on the vacuum tube (48).

4. A high-precision laser cutting device for injection molds according to claim 3, characterized in that: Each of the first suction cylinders (10) is connected to a first filter head (22) at its top. Each of the second suction cylinders (14) is fitted with a second filter head (24) at its top port. Each of the second suction holes (8) is fitted with a filter sleeve (23) at its top port. The top of the second suction cylinder (14) is flush with the bottom of the filter sleeve (23). The inner diameter of the filter sleeve (23) is equal to the outer diameter of the second suction cylinder (14), and the inner diameter of the second suction cylinder (14) is equal to the inner diameter of the first suction cylinder (10).

5. A high-precision laser cutting device for injection molds according to claim 4, characterized in that: Each vacuum box (4) is equipped with a sensor (26), and the bottom of each vacuum box (4) is connected to a pressure stabilizing cylinder (25). A pressure stabilizing plate (27) is slidably connected to the inner wall of the pressure stabilizing cylinder (25). A sealing groove is opened on the circumferential surface of the pressure stabilizing plate (27), and a sealing ring (28) is sleeved on the pressure stabilizing plate (27) corresponding to the sealing groove. A second electric cylinder (29) is installed on the inner wall of the pressure stabilizing cylinder (25), and the telescopic end of the second electric cylinder (29) is connected to the bottom of the pressure stabilizing plate (27).

6. A high-precision laser cutting device for injection molds according to claim 5, characterized in that: Each vacuum box (4) has two symmetrically arranged linear modules (37) installed on its side. Each linear module (37) is slidably connected to a sliding seat (38). A connecting rod (39) is connected to the sliding seat (38). A sealing strip (40) is connected to the other end of the connecting rod (39). The sealing strip (40) is slidably connected to the top of its corresponding multiple supports (6).

7. A high-precision laser cutting device for injection molds according to claim 6, characterized in that: Each vacuum box (4) is provided with a take-up roller (43) on both the front and rear sides. A transfer shaft (42) is snapped into the inner side of the take-up roller (43). A first transfer frame (41) is rotatably connected to both ends of the transfer shaft (42). The first transfer frame (41) is connected to the vacuum box (4). A rubber strip (45) is wound around the take-up roller (43). The other end of the rubber strip (45) is connected to the sealing strip (40). A coil spring (44) is sleeved on the adapter shaft (42), and the adapter shaft (42) and the first adapter frame (41) are elastically connected through the coil spring (44).

8. A high-precision laser cutting device for injection molds according to claim 7, characterized in that: The top edge of the vacuum box (4) is provided with a rounded corner structure corresponding to the rubber strip (45). The top of the rubber strip (45) is connected to a pressure roller (46). Both ends of the pressure roller (46) are rotatably connected to a second adapter (47). The second adapter (47) is connected to the vacuum box (4).

9. A high-precision laser cutting device for injection molds according to claim 8, characterized in that: Each of the bends (30) has a stationary turntable (31) attached to its inner wall. The stationary turntable (31) has a plurality of first air holes (32) arranged in a ring array. The inner wall of the bend (30) is rotatably connected to a moving turntable (33) corresponding to the end face of the stationary turntable (31). The moving turntable (33) has a plurality of second air holes (34) corresponding to the plurality of first air holes (32). A motor (36) is installed on the outer wall of the bend (30), and a drive shaft (35) is rotatably connected to the motor (36) on the outer wall of the bend (30). One end of the drive shaft (35) is connected to the output end of the motor (36), and the other end of the drive shaft (35) is connected to the rotating disk (33).

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