Numerical control punching machine die and numerical control punching machine

Abstract

The invention discloses a numerical control press die and a numerical control press, and belongs to the technical field of numerical control press dies. Comprising an upper die assembly, a lower die base and a clamping assembly arranged between the upper die assembly and the lower die base and at the bottom of the lower die base. The clamping assembly comprises a triggering unit, a clamping unit and a lagging unit. The trigger unit is synchronously triggered and transmits downward mechanical thrust when the upper die assembly is pressed downwards for blanking, the clamping unit is driven to clamp and lock the waste wafer falling into the lower die base in the middle, the state is kept through the lagging unit, clamping is released until the upper die assembly is reset upwards to be separated from a plate, and then the waste wafer is clamped and locked through the lagging unit. The linkage structure can effectively resist vacuum negative pressure at the bottom of the punch and oil film composite adsorption force at the moment of demolding, waste materials are prevented from being taken out reversely or clamped in a blanking hole half way, it is guaranteed that the waste materials are discharged smoothly in the follow-up blanking action, and the shutdown maintenance cost of equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of CNC punching machine mold technology, and more particularly to a CNC punching machine mold and a CNC punching machine. Background Technology

[0002] When CNC punching machines process sheet metal holes, they mainly rely on the upper die punch and the lower die die cutting edge to perform the punching action. The conventional lower die base has a through-hole center blanking hole. During the stamping operation, the punch descends at high speed, penetrates the sheet metal, and cuts into the center blanking hole. The cut-off scrap usually falls down along the blanking hole channel by its own gravity and is discharged. The punching machine then performs continuous punching operations in this cycle.

[0003] The existing lower die structure has the problem of scrap rebounding and sticking under actual high-speed punching conditions. As the frequency of punching increases, at the moment the punch is pulled away from the blanking hole during high-speed return, a local vacuum negative pressure is easily generated between its bottom end face and the cut scrap piece. In addition, the stamping lubricating oil coated on the sheet metal has surface tension, which causes the scrap piece to be subjected to strong vacuum adsorption force and oil film adhesion force. When the combined adsorption force is greater than the weight of the scrap piece itself, the scrap piece will be carried out by the punch in the opposite direction or stuck in the blanking hole. In subsequent punching operations, this affects the discharge of residual scrap and increases the downtime maintenance cost of the equipment.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a CNC punching die and a CNC punching machine to solve the technical problem of waste material rebounding and causing secondary dent damage to the sheet metal due to negative pressure and oil film adhesion during high-speed punching.

[0006] The present invention adopts the following technical solution: a CNC punching die and a CNC punching machine. It includes an upper die assembly for applying a downward punching stroke;

[0007] The lower mold base is correspondingly located below the upper mold assembly and is coaxially aligned with the upper mold assembly to perform blanking.

[0008] A clamping assembly is disposed between the upper die assembly and the lower die base and at the bottom of the lower die base. It includes a triggering unit, a clamping unit, and a hysteresis unit. The triggering unit is triggered when the upper die assembly is pressed down to punch and synchronously transmits a downward mechanical thrust. The clamping unit is used to center and clamp the waste disc that falls into the lower die base under the drive of the mechanical thrust. The hysteresis unit is used to maintain the locked state until the upper die assembly is reset upward and detached from the sheet material.

[0009] Furthermore, the triggering unit includes a sliding block, a guide shaft, a return spring, and a push plate. A side slot is formed through the lower side of the lower mold base. The guide shaft is vertically fixed in the side slot. The sliding block is hollow and slidably sleeved on the guide shaft. The return spring is sleeved on the guide shaft, with its two ends connected to the bottom surface of the sliding block and the bottom surface of the side slot, respectively. A hollow connecting block is fixed to one end of the sliding block. The push plate is fixed to one end of the connecting block and is set downwards to convert the vertical movement of the sliding block into a lateral thrust for driving the clamping unit.

[0010] Furthermore, the triggering unit also includes a sliding pin, a convex ball, and a connecting spring. The upper mold base in the upper mold assembly has a snap-fit ​​hole on its side wall. The sliding pin is horizontally slidably disposed on the side of the sliding block. The convex ball, fixed at its top, extends into the lower mold base. The connecting spring is connected between the end of the sliding pin that extends into the sliding block and the inner wall of the sliding block. The supporting force of the connecting spring is less than the snap-fit ​​force between the convex ball and the snap-fit ​​hole. When the stamped waste disc falls into the lower mold base and squeezes the convex ball, the convex ball pushes the connecting spring backward until it engages with the snap-fit ​​hole, thereby driving the sliding block to move downward synchronously.

[0011] Furthermore, the clamping unit includes a fixed ring, a movable ring, a first waist-shaped groove, a trigger rod, locking claws, a trigger shaft, and a pin. The fixed ring is fixed to the bottom surface of the lower mold base. The first waist-shaped groove is formed through the circumference of the fixed ring. The movable ring is rotatably disposed within the inner ring of the fixed ring. The trigger rod is fixed to the side of the movable ring and extends through the first waist-shaped groove to contact the push plate. Several locking claws are rotatably disposed along the circumferential direction of the bottom surface of the movable ring via a pin. The trigger shaft is rotatably disposed at one end of the locking claws. The bottom surface of the fixed ring has a guide groove for the trigger shaft to swing. When the push plate moves down and pushes the trigger rod to rotate the movable ring, the trigger shaft in the guide groove guides several locking claws to rotate and clamp the circular waste material.

[0012] Furthermore, the clamping unit also includes a second waist-shaped groove, a fixing pin, a tension spring, and a fixing nail. The second waist-shaped groove is formed on the circumferential surface of the fixing ring. The fixing pin is vertically fixed in the second waist-shaped groove. The fixing nail is fixed on the side of the movable ring. The two ends of the tension spring are respectively connected to the fixing pin and the fixing nail, and are used to deform and store force when the movable ring is rotated by external force, and to pull the movable ring to reset after the external force is released.

[0013] Furthermore, the hysteresis unit includes a first switch, a second switch, a first electromagnet, and a second electromagnet. The second switch is disposed on the bottom surface of the side slot, and the first switch is disposed at one end of the inner wall of the sliding block. The first electromagnet is embedded at a higher position on the inclined surface of the push plate, and the second electromagnet is embedded on the surface of the trigger rod. The first and second electromagnets are de-energized by default. When the sliding block presses down on the second switch, the first and second electromagnets are energized and attracted to maintain the clamping state of the clamping unit on the circular waste. When the sliding pin slides backward on the first switch, the first and second electromagnets are de-energized and disengaged.

[0014] Furthermore, the upper die assembly also includes a die sleeve flange, a support shaft, and a support spring. The die sleeve flange is adapted to be fixed on the upper turntable of the punch press and is coaxial with the mounting holes on the upper turntable. The upper turntable has a plurality of mounting holes. The die sleeve flange is fixed on the upper turntable and is coaxial with the mounting holes. The support shaft is arranged around the die sleeve flange, with its bottom end fixed on the upper turntable and its top end moving upward through the die sleeve flange and threaded with a nut. The support spring is sleeved on the support shaft, with both ends connected to the die sleeve flange and the upper turntable, respectively, and is used to drive the upper die seat upward to reset through its own elastic force and overcome the resistance of the convex ball to disengage.

[0015] Furthermore, including:

[0016] A frame on which a worktable is fixed;

[0017] A feed assembly, mounted on the worktable, is used to clamp the sheet metal and perform translational positioning within a two-dimensional plane;

[0018] A die assembly, mounted on the frame, is used to provide stamping power and switch dies between different workstations;

[0019] And the CNC punching die as described in any one of the claims, wherein the upper die assembly of the CNC punching die is disposed at the upper position of the die assembly, and the lower die base is correspondingly disposed at the lower position of the die assembly.

[0020] Furthermore, the mold assembly also includes a drive unit, two sets of transmission units, a stamping unit, an upper turntable, and a lower turntable. The lower turntable and the upper turntable are respectively provided with mounting holes. The drive unit includes a servo motor, a reducer, a transmission shaft, and a drive sprocket. Both sets of transmission units include an auxiliary bearing seat, a transmission sprocket, a drive gear, and a driven gear. The stamping unit of the mold assembly includes a support plate, a hydraulic cylinder, and a stamping head. The servo motor is connected to the reducer and fixed to the side of the frame. The transmission shaft is vertically arranged and connected to the output end of the reducer. The two drive sprockets are respectively fixed to the upper and lower ends of the transmission shaft.

[0021] Furthermore, the two sets of transmission units are respectively set corresponding to the upper turntable and the lower turntable. The auxiliary bearing seat is fixed on the worktable. The transmission sprocket is rotatably set in the auxiliary bearing seat through a rotating shaft and is connected to the drive sprocket on the same side through a chain. The drive gear is fixed on the other end of the transmission sprocket with a rotating shaft. The driven gear is coaxially sleeved on the corresponding turntable and meshes with the drive gear. The support plate is fixed on the frame. The hydraulic cylinder is vertically set on the support plate. The punching head is fixed on the telescopic end of the hydraulic cylinder and is adapted to be aligned with any upper mold on the upper turntable. It is used to synchronously drive the upper and lower sets of transmission units by the drive sprockets at both ends of the transmission shaft to realize the synchronous switching of the upper and lower molds and output the downward punching power by the punching head.

[0022] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0023] A CNC punching die and a CNC punching machine are disclosed. The invention utilizes a clamping assembly comprising a trigger unit, a clamping unit, and a hysteresis unit, located between the upper die assembly and the lower die base, and at the bottom of the lower die base. The trigger unit is synchronously triggered when the upper die assembly is pressed down for punching, thereby transmitting a downward mechanical thrust to drive the clamping unit to centrally clamp and lock the scrap disc falling into the lower die base. Simultaneously, the hysteresis unit maintains this locking state until the upper die assembly is completely detached from the sheet metal and then the clamping is released. This structure can apply continuous physical clamping and limiting to the scrap disc in the blanking hole at the instant of high-speed return and demolding of the punch, directly resisting the localized vacuum negative pressure adsorption force generated between the bottom face of the punch and the scrap disc, as well as the adhesion force of the stamping lubricating oil film. This overcomes the scrap rebound problem caused by the combined adsorption force, preventing the scrap disc from being carried out in the opposite direction or stuck in the blanking hole. This improves the yield of sheet metal parts processing while reducing equipment maintenance costs caused by frequent downtime for scrap cleaning. Attached Figure Description

[0024] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0025] In the attached diagram:

[0026] Figure 1 This is a schematic diagram of a CNC punching die and a CNC punching machine according to this application;

[0027] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0028] Figure 3 for Figure 1A schematic diagram of the bottom structure;

[0029] Figure 4 for Figure 3 A magnified structural diagram at point B;

[0030] Figure 5 for Figure 1 A partial structural diagram;

[0031] Figure 6 for Figure 5 A magnified structural diagram at point C;

[0032] Figure 7 for Figure 5 Schematic diagram of the middle mold component structure;

[0033] Figure 8 for Figure 7 A partial structural diagram;

[0034] Figure 9 for Figure 8 A magnified structural diagram at point D;

[0035] Figure 10 for Figure 8 A partial structural diagram;

[0036] Figure 11 for Figure 10 A magnified structural diagram at point E;

[0037] Figure 12 for Figure 11 A magnified structural diagram at point F;

[0038] Figure 13 for Figure 10 A schematic diagram of the bottom structure;

[0039] Figure 14 for Figure 13 A magnified structural diagram at point G;

[0040] Figure label:

[0041] 1. Frame; 11. Control Panel; 12. Worktable; 2. Feed Assembly; 21. Moving Horizontal Cover; 22. First Lead Screw; 23. First Sliding Seat; 24. Clamp Base; 25. Connecting Block; 26. Clamping Cylinder; 27. Lower Clamping Plate; 28. Upper Clamping Plate; 29. ​​Rotary Motor; 210. Slide Rail; 211. Sliding Block; 212. Second Sliding Seat; 213. Second Lead Screw; 3. Mold Assembly; 31. Servo Motor; 32. Reducer; 33. Transmission Vertical Shaft; 34. Drive Sprocket; 35. Auxiliary Bearing Seat; 36. Transmission Sprocket; 37. Drive Gear; 38. Upper Turntable; 39. Driven Gear; 310. Lower Turntable; 311. Support Plate; 312. Hydraulic Cylinder; 31 3. Punching head; 4. Upper die assembly; 41. Die sleeve flange; 42. Support shaft; 43. Support spring; 44. Upper die base; 441. Buckle hole; 45. Lower die base; 451. Side slot; 452. Second switch; 5. Clamping assembly; 51. Sliding block; 52. Guide shaft; 53. Return spring; 54. Sliding pin shaft; 55. Convex ball; 56. Connecting block; 57. Connecting spring; 58. First switch; 59. Push plate; 510. Fixed ring; 511. Movable ring; 512. First waist-shaped groove; 513. Trigger rod; 514. Locking claw; 515. Trigger shaft; 516. Shaft pin; 517. Second waist-shaped groove; 518. Fixed pin; 519. Tension spring; 520. Fixing nail. Detailed Implementation

[0042] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0043] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Reference Figures 1-14 As shown, this embodiment of the invention provides a CNC punching die and a CNC punching machine, which includes a frame 1 and a worktable 12 fixedly arranged on the frame 1. A control panel 11 is fixed on the side of the frame 1. In order to achieve high positioning accuracy movement of the sheet metal in a two-dimensional plane, a feed assembly 2 for clamping the sheet metal and performing translational positioning in a two-dimensional plane is arranged on the worktable 12. The feed assembly 2 is composed of an X-axis moving unit, a Y-axis moving unit and several clamping units.

[0045] Specifically, the Y-axis moving unit is located below the worktable 12 and includes a rotary motor 29, a slide rail 210, a sliding block 211, a second sliding seat 212, and a second lead screw 213. The slide rail 210 is fastened to the bottom surface of the worktable 12, and the sliding block 211 forms a linear sliding guide engagement with it. The two ends of the second lead screw 213 are suspended and supported on the bottom surface of the worktable 12 via bearing seats. The rotary motor 29 is anchored to the bottom surface of the worktable 12 via a mounting seat, and its power output shaft is connected to the second lead screw 213. The second sliding seat 212 has internal threads and is fitted onto the second lead screw 213 to form a helical transmission pair. Its side is rigidly fixed to the sliding block 211.

[0046] The X-axis moving unit is located above the worktable 12 and includes a moving horizontal cover 21, a first lead screw 22, a first sliding seat 23, and a clamp base 24. The worktable 12 has an open slide groove (not shown in the figure) that runs through the Y-axis direction. The bottom surface of the moving horizontal cover 21 passes through the open slide groove and is connected to the upper surface of the second sliding seat 212 below. The first lead screw 22 is bearing connected inside the moving horizontal cover 21. The first sliding seat 23 is threadedly connected to the first lead screw 22 and slides along the inner bottom surface of the moving horizontal cover 21.

[0047] Several clamping units are arranged in an array along the straight direction of the clamping base 24. Each clamping unit includes a connecting block 25, a clamping cylinder 26, a lower clamping plate 27, and an upper clamping plate 28. The connecting block 25 and the lower clamping plate 27 are both anchored to the side of the clamping base 24. The upper clamping plate 28 is pivotally connected to the lower clamping plate 27 via a hinge shaft. The clamping cylinder 26 is vertically fixed to the connecting block 25, and its piston rod is movably connected downward to one end of the upper clamping plate 28. The cylinder extends and retracts to force the upper clamping plate 28 to rotate around the hinge, thereby achieving physical clamping of the plate.

[0048] The frame 1 is equipped with a mold assembly 3 for providing stamping power and switching molds at different workstations. The mold assembly 3 includes a drive unit, two sets of transmission units, a stamping unit, an upper turntable 38 and a lower turntable 310.

[0049] The lower turntable 310 and the upper turntable 38 are respectively provided with mold mounting holes (not shown in the figure). The drive unit includes a servo motor 31, a reducer 32, a transmission shaft 33 and a drive sprocket 34. The servo motor 31 is connected to the reducer 32 and fixed on the side of the frame 1. The transmission shaft 33 is arranged vertically, and its input end is connected to the reducer 32. The two drive sprockets 34 are respectively keyed to the upper and lower ends of the transmission shaft 33.

[0050] Two sets of transmission units are arranged corresponding to the upper turntable 38 and the lower turntable 310, respectively. Each set includes an auxiliary bearing seat 35, a transmission sprocket 36, a drive gear 37, and a driven gear 39. The auxiliary bearing seat 35 is fixed on the worktable 12. The shaft of the transmission sprocket 36 is supported in the auxiliary bearing seat 35 and is connected to the drive sprocket 34 at the same height on the same side via an industrial chain. The drive gear 37 is coaxially fixed to the other end of the transmission sprocket 36. The driven gear 39 is coaxially sleeved on the outer ring of the corresponding turntable and meshes with the drive gear 37. The stamping unit includes a support plate 311 welded to the frame 1. A hydraulic cylinder 312 is vertically mounted on the support plate 311. A stamping head 313 is assembled at the telescopic end of the hydraulic cylinder 312 to be suitable for outputting heavy-duty stamping thrust to any mold on the upper turntable 38.

[0051] The upper die assembly 4 is arranged above the die assembly 3 and includes a die sleeve flange 41, a support shaft 42, a support spring 43, and an upper die base 44. The die sleeve flange 41 is embedded and fixed in the mounting hole of the upper turntable 38. The support shaft 42 is evenly distributed around the die sleeve flange 41. The bottom end of the support shaft 42 is fixed to the upper turntable 38, and the top end moves upward through the die sleeve flange 41 and is limited by a nut. The support spring 43 is sleeved on the outside of the support shaft 42, and its two ends abut against the bottom surface of the die sleeve flange 41 and the upper surface of the upper turntable 38, respectively. The upper die base 44 is slidably nested in the inner ring of the die sleeve flange 41 and placed in the mounting hole. A snap hole 441 is machined on the side wall of the upper die base 44. The lower die base 45 is correspondingly arranged in the mounting hole at the lower position of the die assembly 3. The lower die base 45 and the upper die base 44 are coaxially cooperated to perform blanking.

[0052] In order to overcome the defect of material rebound caused by vacuum negative pressure adsorption and oil film adhesion of waste material under high-speed punching conditions, this embodiment provides a clamping component 5 between the upper die assembly 4 and the lower die base 45 and at the bottom of the lower die base 45. The clamping component 5 includes a triggering unit, a clamping unit and a hysteresis unit.

[0053] To achieve mechanical synchronization and displacement extraction during the stamping stroke, the triggering unit is arranged on the side wall of the lower die holder 45. This triggering unit specifically includes a sliding block 51, a guide shaft 52, a return spring 53, a sliding pin 54, a convex ball 55, a connecting block 56, a connecting spring 57, and a push plate 59. Specifically, a through side slot 451 is milled on the lower side of the lower die holder 45. A guide shaft 52 is vertically arranged within the side slot 451. The sliding block 51 is designed as a hollow sleeve structure, slidingly fitted onto the guide shaft 52 to form a linear guide. A return spring 53 is fitted on the guide shaft 52 to provide a return force. The two ends of the return spring 53 are connected to the bottom surface of the sliding block 51 and the bottom surface of the side slot 451, respectively. The sliding pin 54 is horizontally mounted in a guide hole on the side of the sliding block 51, extending into the lower die holder 45. A convex ball 55 is fixed at one end of the inner cavity of the slide block 51, and a connecting spring 57 is connected between the end of the sliding pin shaft 54 ​​that extends into the interior of the sliding block 51 and the inner wall of the sliding block 51. The supporting force of the connecting spring 57 is set to be less than the mechanical fastening force when the convex ball 55 and the buckle hole 441 are engaged. In addition, a hollow connecting block 56 is fixed at one end of the sliding block 51. A push plate 59 with a slope is fixed at the end of the connecting block 56. The push plate 59 is installed to move downward through the lower turntable 310 so as to transmit the pushing force to the bottom.

[0054] To convert the downward linear displacement of the sliding block 51 into a centripetal clamping force on the waste disc in the discharge channel, a clamping unit is assembled directly below the lower die base 45. This clamping unit specifically includes a fixed ring 510, a movable ring 511, a trigger rod 513, a locking claw 514, a trigger shaft 515, a shaft pin 516, a fixing pin 518, a tension spring 519, and a fixing pin 520. Specifically, the fixed ring 510 is fixed to the bottom surface of the lower die base 45, and its outer circumferential wall has a first waist-shaped groove 512 and a second waist-shaped groove 517. The movable ring 511 is rotatably disposed within the inner ring of the fixed ring 510. The trigger rod 513 is fixed to the side of the movable ring 511 and extends through the first waist-shaped groove 512 to contact the inclined surface of the push plate 59. The locking claw 514 moves along the movable ring 510... The bottom surface of the ring 511 has several pins 516 rotatably mounted on the bottom circumferential direction. The trigger shaft 515 is rotatably mounted on one end of the locking claw 514. Correspondingly, the bottom surface of the fixed ring 510 has a guide groove (not shown in the figure) for the trigger shaft 515 to swing. By using the trajectory of the guide groove to limit the movement, the trigger shaft 515 is forced to deflect radially when the movable ring 511 rotates, thereby guiding the locking claw 514 to swing towards the center and clamp. At the same time, the fixed pin 518 is vertically fixed in the second waist-shaped groove 517, and the fixed nail 520 is fixed on the side of the movable ring 511. The two ends of the tension spring 519 are connected to the fixed pin 518 and the fixed nail 520 respectively, which are used to stretch and store force when the movable ring 511 is rotated by external force, and to pull the movable ring 511 to reset after the external force is released.

[0055] To maintain the clamping and locking state of the scrap material by the clamping unit during the upward ejection of the punch, until the punch is completely detached from the sheet metal to prevent the scrap material from bouncing back, the hysteresis unit achieves a delayed action through the cooperation of switches and electromagnetic components. Specifically, the hysteresis unit includes a first switch 58, a second switch 452, a first electromagnet, and a second electromagnet. Specifically, the second switch 452 is located on the bottom surface of the side slot 451, the first switch 58 is located on one end of the inner wall of the sliding block 51, the first electromagnet is embedded in the inclined surface of the push plate 59 at a higher position, and the second electromagnet is embedded in the surface of the trigger rod 513. The first and second electromagnets are in a de-energized state by default. When the sliding block 51 presses down on the second switch 452, the first and second electromagnets are energized and attracted to maintain the clamping state of the clamping unit on the waste disc. After the stamping is completed, the upper die base 44 is reset upward by the support spring 43, which forces the convex ball 55 to disengage from the buckle hole 441. This causes the sliding pin shaft 54 ​​to slide backward and press the first switch 58, causing the first and second electromagnets to de-energize and disengage, thus releasing the lock.

[0056] Working Principle: When the equipment is performing processing and production, the operator issues execution commands through the control panel 11. The clamping cylinder 26 in the feed assembly 2 drives the upper clamping plate 28 to press and rigidly clamp the edge of the sheet material. Subsequently, the rotary motor 29 in the Y-axis direction and the first lead screw 22 in the X-axis direction work together to drive the sheet material to complete the two-dimensional coordinate displacement on the worktable 12. Simultaneously, the servo motor 31 of the mold assembly 3 starts, and through the transmission shaft 33 and the meshing of the upper and lower transmission chains and gear pairs, it drives the upper turntable 38 and the lower turntable 310 to rotate in absolute synchronous relative position, switching the target station mold to the working area directly below the hydraulic cylinder 312 for standby.

[0057] During the blanking operation, the hydraulic cylinder 312 drives the punch head 313 to press down on the upper die base 44 to cut through the sheet metal. The blanked waste discs fall into the internal channel of the lower die base 45 and are pushed down by the continuing downward movement of the upper die base 44, which in turn squeezes the convex ball 55 downward, causing it to overcome the preload of the connecting spring 57 and retract into the sliding block 51. As the upper die base 44 continues to move downward, the snap hole 441 on its side wall aligns with the convex ball 55. The convex ball 55 instantly springs into the snap hole 441 to achieve mechanical interlocking, forcing the sliding block 51 to move down synchronously with the upper die base 44 until the sliding block 51 moves down and touches the second switch 452 at the bottom, so that the first electromagnet and the second electromagnet are energized and attracted. At the same time, the push plate 59 connected to the sliding block 51 pushes down the trigger rod 513, forcing the movable ring 511 to overcome the tension of the tension spring 519 and rotate. At this time, the trigger shaft 515 at the end of the locking claw 514 is constrained by the trajectory of the bottom guide groove and causes radial offset, guiding all the locking claws 514 to retract towards the center, applying radial clamping force to the waste disc, and completely cutting off the path of the waste jumping upward from the physical structure.

[0058] After the blanking is completed, the demolding and reset stage begins. The hydraulic cylinder 312 returns, and the upper die holder 44 is pulled upward and separated from the sheet material under the strong rebound of the support spring 43. In the initial stage of this upward stroke, due to the dual electromagnets maintaining an energized and engaged state, the push plate 59 and the trigger rod 513 remain relatively fixed, and the clamping unit is in a continuous locking dead zone. The waste material is stuck in the lower die channel. As the upper die base 44 continues to move upward, the upward mechanical pulling force exceeds the interlocking resistance threshold of the buckle hole 441 and the convex ball 55. The convex ball 55 is forced out and disengaged. Subsequently, the sliding pin shaft 54 ​​retracts and presses the first switch 58 inside the sliding block 51, cutting off the electromagnet power supply. At this time, there is a gap between the circular waste material and the upper die base 44, and they are not in contact. After losing the magnetic constraint, the tension spring 519 quickly contracts and pulls the movable ring 511 to rotate in the opposite direction. Each locking claw 514 then spreads outward, and the waste circular piece that has lost its clamping force falls naturally under the action of gravity. The equipment then resets and prepares to execute the next punching cycle.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A CNC punching die, comprising: Upper die assembly (4) is used to apply the punching stroke downwards; The lower mold base (45) is correspondingly located below the upper mold assembly (4) and is coaxially engaged with the upper mold assembly (4) to perform blanking; The clamping assembly (5) is disposed between the upper die assembly (4) and the lower die base (45) and at the bottom of the lower die base (45). It includes a triggering unit, a clamping unit and a hysteresis unit. The triggering unit is used to be triggered when the upper die assembly (4) is pressed down to punch and synchronously transmits downward mechanical thrust. The clamping unit is used to clamp and lock the waste disc that falls into the lower die base (45) under the drive of the mechanical thrust. The hysteresis unit is used to maintain the locked state until the upper die assembly (4) is reset upward and detached from the plate and then released.

2. The CNC punching die according to claim 1, characterized in that: The triggering unit includes a sliding block (51), a guide shaft (52), a reset spring (53), and a push plate (59). A side slot (451) is provided on the lower side of the lower mold base (45). The guide shaft (52) is vertically fixed in the side slot (451). The sliding block (51) is hollow and is slidably sleeved on the guide shaft (52). The reset spring (53) is sleeved on the guide shaft (52) and its two ends are respectively connected to the bottom surface of the sliding block (51) and the bottom surface of the side slot (451). A hollow connecting block (56) is fixed to one end of the sliding block (51). The push plate (59) is fixed to one end of the connecting block (56) and is set downward, which is used to convert the vertical movement of the sliding block (51) into the lateral thrust of the driving clamping unit.

3. A CNC punching die according to claim 2, characterized in that: The triggering unit also includes a sliding pin (54), a convex ball (55), and a connecting spring (57). The upper mold base (44) in the upper mold assembly (4) has a snap hole (441) on its side wall. The sliding pin (54) is horizontally slidably disposed on the side of the sliding block (51). The convex ball (55) fixed at its top extends into the lower mold base (45). The connecting spring (57) is connected between the end of the sliding pin (54) that extends into the sliding block (51) and the inner wall of the sliding block (51). The supporting force of the connecting spring (57) is less than the snapping force between the convex ball (55) and the snap hole (441). When the stamped waste disc falls into the lower mold base (45) and squeezes the convex ball (55), the convex ball (55) pushes the connecting spring (57) backward until it engages with the snap hole (441) to drive the sliding block (51) to move down synchronously.

4. A CNC punching die according to claim 3, characterized in that: The clamping unit includes a fixed ring (510), a movable ring (511), a first waist-shaped groove (512), a trigger rod (513), a locking claw (514), a trigger shaft (515), and a shaft pin (516). The fixed ring (510) is fixed to the bottom surface of the lower mold base (45). The first waist-shaped groove (512) is formed through the circumference of the fixed ring (510). The movable ring (511) is rotatably disposed within the inner ring of the fixed ring (510). The trigger rod (513) is fixed to the side of the movable ring (511) and extends through the first waist-shaped groove (513). 2) In contact with the push plate (59), the locking claws (514) are rotatably arranged in a plurality of positions along the circumferential direction of the bottom surface of the movable ring (511) via the shaft pin (516). The trigger shaft (515) is rotatably arranged at one end of the locking claws (514). The bottom surface of the fixed ring (510) is provided with a guide groove for the trigger shaft (515) to swing. When the push plate (59) moves down to push the trigger rod (513) to drive the movable ring (511) to rotate, the locking claws (514) are rotated and clamped by the rotation limit of the trigger shaft (515) in the guide groove.

5. A CNC punching die according to claim 4, characterized in that: The clamping unit also includes a second waist-shaped groove (517), a fixing pin (518), a tension spring (519), and a fixing nail (520). The second waist-shaped groove (517) is formed on the circumferential surface of the fixing ring (510). The fixing pin (518) is vertically fixed in the second waist-shaped groove (517). The fixing nail (520) is fixed on the side of the movable ring (511). The two ends of the tension spring (519) are connected to the fixing pin (518) and the fixing nail (520) respectively. The spring is used to deform and store force when the movable ring (511) is rotated by external force, and to pull the movable ring (511) back to its original position after the external force is released.

6. A CNC punching die according to claim 4, characterized in that: The hysteresis unit includes a first switch (58), a second switch (452), a first electromagnet, and a second electromagnet. The second switch (452) is disposed on the bottom surface of the side slot (451). The first switch (58) is disposed at one end of the inner wall of the sliding block (51). The first electromagnet is embedded at a higher position on the inclined surface of the push plate (59). The second electromagnet is embedded on the surface of the trigger rod (513). The first and second electromagnets are de-energized by default. When the sliding block (51) presses down on the second switch (452), the first and second electromagnets are energized and attracted to each other to maintain the clamping state of the clamping unit on the circular waste. When the sliding pin shaft (54) slides backward to press the first switch (58), the first and second electromagnets are de-energized and disengaged.

7. A CNC punching die according to claim 3, characterized in that: The upper die assembly (4) also includes a die sleeve flange (41), a support shaft (42), and a support spring (43). The die sleeve flange (41) is adapted to be fixed on the upper turntable (38) of the punch press and is coaxial with the mounting holes on the upper turntable (38). The upper turntable (38) has a plurality of mounting holes. The die sleeve flange (41) is fixed on the upper turntable (38) and is coaxial with the mounting holes. The support shaft (42) is arranged around the die sleeve flange (41), with its bottom end fixed on the upper turntable (38) and its top end moving upward through the die sleeve flange (41) and threaded with a nut. The support spring (43) is sleeved on the support shaft (42) and its two ends are connected to the die sleeve flange (41) and the upper turntable (38) respectively. It is used to drive the upper die seat (44) to reset upward and overcome the resistance of the convex ball (55) to disengage by its own elastic force.

8. A CNC punching machine, characterized in that, include: A frame (1) on which a worktable (12) is fixed; The feed assembly (2) is set on the worktable (12) and is used to clamp the plate and perform translation and positioning in a two-dimensional plane; The mold assembly (3) is mounted on the frame (1) and is used to provide stamping power and switch molds at different workstations; And the CNC punching die as described in any one of claims 1 to 7, wherein the upper die assembly (4) of the CNC punching die is disposed at the upper position of the die assembly (3), and the lower die base (45) is disposed at the lower position of the die assembly (3).

9. A CNC punching machine according to claim 8, characterized in that: The mold assembly (3) also includes a drive unit, two sets of transmission units, a stamping unit, an upper turntable (38) and a lower turntable (310). The lower turntable (310) and the upper turntable (38) are respectively provided with mounting holes. The drive unit includes a servo motor (31), a reducer (32), a transmission shaft (33) and a drive sprocket (34). Both sets of transmission units include an auxiliary bearing seat (35), a transmission sprocket (36), a drive gear (37) and a driven gear (39). The stamping unit of the mold assembly (3) includes a support plate (311), a hydraulic cylinder (312) and a stamping head (313). The servo motor (31) is connected to the reducer (32) and fixed on the side of the frame (1). The transmission shaft (33) is vertically arranged and connected to the output end of the reducer (32). The two drive sprockets (34) are respectively fixed at the upper and lower ends of the transmission shaft (33).

10. A CNC punching machine according to claim 9, characterized in that: The two sets of transmission units are respectively set for the upper turntable (38) and the lower turntable (310). The auxiliary bearing seat (35) is fixed on the worktable (12). The transmission sprocket (36) is rotatably mounted in the auxiliary bearing seat (35) via a rotating shaft and is connected to the drive sprocket (34) on the same side via a chain. The drive gear (37) is fixed to the other end of the transmission sprocket (36) with a rotating shaft. The driven gear (39) is coaxially sleeved on the corresponding turntable and is connected to the drive gear. (37) Engagement, the support plate (311) is fixed on the frame (1), the hydraulic cylinder (312) is vertically mounted on the support plate (311), the punch head (313) is fixed on the telescopic end of the hydraulic cylinder (312) and is suitable for aligning with any upper mold on the upper turntable (38), and is used to synchronously drive the upper and lower transmission units by the drive sprockets (34) at both ends of the transmission shaft (33) to realize the synchronous switching of the upper and lower molds, and output the downward punching power by the punch head (313).

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