Numerical control turret punch press for producing porous sheet metal

Abstract

This invention relates to the field of turret punch technology, and more particularly to a CNC turret punch for multi-hole sheet metal production. It includes: a main body, on which a punch module and a lower turntable are mounted; a ring-shaped lower die base is fixedly connected to the upper side of the lower turntable; a lower die holder is fixedly connected to the upper side of the lower die base; a lower die is fixedly connected to the lower die holder; and a separation mechanism for separating scrap from the punch is provided within the lower die holder. The separation mechanism includes: an L-shaped component, a mounting ring, two symmetrically distributed swing springs, two symmetrically distributed clamping blocks, and a limiting ring; the two clamping blocks are respectively fixed to the upper ends of adjacent swing springs. This invention utilizes the two clamping blocks to actively clamp the scrap adhering to the lower side of the punch, applying a rigid constraint force to the scrap to promote separation from the punch, thus reducing the probability of the punch carrying scrap away, and consequently reducing the probability of damage to the sheet metal, the punch, and the cutting edge of the lower die.

Description

Technical Field

[0001] This invention relates to the field of turret punch press technology, and more particularly to a CNC turret punch press for multi-hole sheet metal production. Background Technology

[0002] A turret CNC punch press is a three-axis CNC machine tool designed for punching, step punching, and shallow drawing of metal sheets. It is particularly suitable for small-batch, multi-variety production scenarios such as sheet metal parts. The equipment consists of core components such as a computer control system, a mechanical or hydraulic power system, a servo feeding mechanism, a die library, a die selection system, and a peripheral programming system. Its workflow is as follows: First, the processing program is created through programming software; then, the servo feeding mechanism precisely positions the sheet metal to the target processing position according to the program instructions; simultaneously, the die selection system automatically selects the required die from the die library; finally, the hydraulic (or mechanical) power system drives the punching mechanism to execute the punching action according to the program, thereby automatically completing the entire workpiece processing process.

[0003] However, during operation, existing CNC turret punch presses often experience issues such as instantaneous high pressure generated during punching, electrostatic adsorption, oil stains, or localized vacuum effects between the punch and the scrap material. These issues cause scrap material to adhere to the punch surface, moving with the punch as it rises and directly contacting the sheet metal surface during the next punching cycle. This can easily lead to indentations, scratches, or even damage to the punch or die cutting edge. Existing methods, such as installing a stripper plate that fits against the punch sidewall, can prevent the punch from moving the scrap material. However, this can result in scrap material being carried out of the die cutting edge or getting stuck in the punched holes in the sheet metal. When the sheet metal moves to change the punching position, scrap material can easily fly onto the upper side of the sheet metal or get stuck between the sheet metal and the die, leading to sheet metal scrap and damage to the punch or die cutting edge. Summary of the Invention

[0004] This invention provides a CNC turret punch for multi-hole sheet metal production, which overcomes the shortcomings of existing CNC turret punches where scrap moves with the punch during use, causing damage to the punch, sheet metal, and lower die cutting edge.

[0005] The technical implementation scheme of the present invention is as follows: a CNC turret punch press for multi-hole sheet metal production, comprising: a main body, wherein a punch module and a lower turntable are mounted on the main body, a lower die base is fixedly connected to the upper side of the lower turntable, a lower die seat is fixedly connected to the upper side of the lower die base, a lower die is fixedly connected to the lower die seat, and a separation mechanism for separating waste material from the punch is provided inside the lower die seat; the separation mechanism includes: an L-shaped component, a mounting ring, two symmetrically distributed swing springs, two symmetrically distributed clamping blocks, and a limiting... Positioning ring, the L-shaped component is slidably connected to the lower die base, the mounting ring is fixedly connected to the L-shaped component, the two swing springs are both fixedly connected to the upper side of the mounting ring, the two clamping blocks are respectively fixedly connected to the upper ends of the adjacent swing springs, the limiting ring is disposed in the lower die base, the limiting ring is used to make the two swing springs swing, and the waste is clamped by the opposing swing of the two clamping blocks. The L-shaped component is provided with a delay component for making the clamping blocks drive the waste to lag behind the punch movement.

[0006] Furthermore, the delay component includes: a pressing rod, a spring, an elastic strip, and a friction block. The pressing rod is slidably connected to the L-shaped member, the spring is located between the pressing rod and the L-shaped member, the elastic strip is located inside the L-shaped member, the pressing rod is used to press the elastic strip to deform and elongate the elastic strip, the friction block is fixedly connected to the elastic strip, and the friction block is used to contact the lower mold base and provide friction force.

[0007] Furthermore, the upper end of the extrusion rod is provided with a spherical head.

[0008] Furthermore, in the top-to-bottom direction, the horizontal distance between the friction block and the extrusion rod gradually decreases, the lower side of the friction block contacts the L-shaped member, and the elastic strip is fixed to the friction block at the lower part of the friction block.

[0009] Furthermore, within the same lower mold base, clamping surfaces are provided on the opposing sides of the two clamping blocks. The distance between the two clamping surfaces gradually increases from bottom to top. The clamping surfaces are provided with uniformly distributed protrusions to increase the friction between the clamping surfaces and the waste material.

[0010] Furthermore, within the same lower mold base, magnifying frames are fixed to the opposite sides of the two swing springs. The magnifying frames are in contact with the limiting ring, and the angle between the side of the magnifying frame in contact with the limiting ring and the horizontal plane is less than 45°, while the angle between the swing spring and the horizontal plane is greater than 45°.

[0011] Furthermore, the two clamping blocks within the same lower mold base are slidably connected to a guide.

[0012] Furthermore, the uppermost point of the spherical head lies within the plane of the upper side surface of the adjacent lower mold.

[0013] Furthermore, the extrusion rod is located at the eccentricity of the adjacent lower mold, and within the same lower mold base, the central axis of the extrusion rod is located in the plane of symmetry of the two clamping blocks.

[0014] Furthermore, the limiting ring is slidably connected to the lower mold base, a fixing ring is fixedly connected inside the lower mold base, and an evenly distributed ring of elastic sheets is fixedly connected to the upper side of the fixing ring, the elastic sheets being fixedly connected to the adjacent limiting ring.

[0015] Those skilled in the art will understand that the present invention has at least the following beneficial effects: The present invention utilizes two clamping blocks to actively clamp the waste material adhering to the lower side of the punch, applying a rigid constraint force to the waste material to cause it to separate from the punch, thereby reducing the probability of the punch carrying the waste material and thus reducing the probability of damage to the sheet metal, the punch, and the cutting edge of the lower die.

[0016] The position of the punch is sensed by the position of the extrusion rod, so that when the punch begins to move upward, the clamping block moves upward one step slower than the punch, and the clamping block separates the waste from the punch.

[0017] By utilizing the contact between the magnifying frame and the limiting ring, the vertical displacement of the mounting ring and the limiting ring is converted into the lateral displacement, thereby reducing the up-and-down reciprocating stroke of the punch, reducing the relative displacement stroke between the punch and the sheet metal, reducing the relative friction between the punch and the sheet metal, and thus reducing the range of wear of the punch in a single punching operation.

[0018] By utilizing the contact between the spherical head and the plate, the spherical head contacts the waste material before it detaches from the plate. After the waste material detaches from the plate, the cooperation between the spherical head and the lower side of the punch keeps the waste material in a stable position, reducing the probability that the waste material will fall directly at the moment the punching ends, and thus reducing the probability that the clamping block will directly clamp the punch.

[0019] By utilizing the sliding characteristic of the limiting ring within the lower die base, the clamping block can adapt to various punching strokes and punching shapes, thereby improving the practicality of this waste discharge method. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the lower turntable and lower mold base of the present invention;

[0022] Figure 3 This is a three-dimensional structural cross-sectional view of the lower mold base and lower mold of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the mounting ring and the limiting ring of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the swing spring and the magnifying frame of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the elastic strip and friction block of the present invention.

[0026] In the attached diagram, the following labels are used: 1-Main body, 101-Punch module, 2-Lower turntable, 3-Lower die base, 4-Lower die holder, 5-Lower die, 6-L-shaped part, 7-Mounting ring, 8-Swing spring rod, 9-Clamping block, 901-Clamping surface, 10-Limiting ring, 11-Extrusion rod, 111-Spherical head, 12-Spring, 13-Elastic strip, 14-Friction block, 15-Magnifying frame, 16-Guide, 17-Fixing ring, 18-Elastic sheet. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment discloses a CNC turret punch press for multi-hole sheet metal production, in order to solve the problem that existing waste materials move with the punch, causing damage to the sheet metal, punch, and lower die cutting edge.

[0030] See Figures 1 to 5 A CNC turret punch press for producing multi-hole sheet metal includes: a main body 1, on which a servo feeding mechanism, a computer control system, and a mechanical power system are installed (these mechanisms and systems are not specifically shown in the accompanying drawings); the main body 1 is equipped with a punch module 101 and a lower turntable 2, the punch module 101 consisting of an upper turntable and several punches thereon (this is an existing structure and is not specifically shown in the drawings); the upper and lower turntables 2 are respectively driven by sprockets and chains to the mechanical power system, so that the upper and lower turntables 2 rotate synchronously and switch the positions of various dies; a ring-shaped lower die base 3 is fixedly connected to the upper side of the lower turntable 2, a lower die seat 4 is fixedly connected to the upper side of the lower die base 3, and a lower die 5 is fixedly connected to the lower die seat 4; the upper cutting edge shape of the lower die 5 matches the shape of its corresponding punch. Figure 2 Only two cutting edge shapes are shown in the diagram; the lower die holder 4 is equipped with a separation mechanism for separating the waste material from the punch.

[0031] It should be noted that this article is appended. Figure 3The description will be based on the lower mold 5 and its upper parts shown in the image.

[0032] See Figures 3 to 5 The separation mechanism includes: an L-shaped component 6, a mounting ring 7, two symmetrically distributed swing springs 8, two symmetrically distributed clamping blocks 9, and a limiting ring 10. The L-shaped component 6 is slidably connected to the lower mold base 4. The mounting ring 7 is fixedly connected to the L-shaped component 6. Both swing springs 8 are fixedly connected to the upper side of the mounting ring 7. Grooves are provided at both the upper and lower positions of the swing springs 8 to facilitate the upper end of the swing springs 8 swinging from the outside to the inside of the mounting ring 7. The two clamping blocks 9 are respectively fixedly connected to the upper ends of adjacent swing springs 8. Clamping surfaces 901 are provided on the opposing sides of the two clamping blocks 9. In the direction from bottom to top, the two clamping surfaces... The spacing between the two clamping surfaces 901 gradually increases, so that when the two clamping surfaces 901 approach each other, they can only contact the scrap located on the lower side of the punch, reducing the probability of the clamping surfaces 901 contacting the punch and reducing the wear rate of the punch. The clamping surfaces 901 are provided with evenly distributed protrusions (the size of the protrusions in the figure is only for illustration) to increase the friction between the clamping block 9 and the scrap, and improve the stability of the clamping block 9 in clamping the scrap. The limiting ring 10 is provided in the lower die base 4. The limiting ring 10 is used to swing the two swing springs 8. The L-shaped part 6 is provided with a delay component for the clamping block 9 to delay the movement of the scrap after the punch.

[0033] The above setup enables the two clamping blocks 9 to actively clamp the waste material adhering to the lower side of the punch, applying a rigid constraint force to the waste material and causing it to separate from the punch. This reduces the probability of the punch carrying the waste material and thus reduces the probability of damage to the sheet metal, the punch, and the cutting edge of the lower die.

[0034] See Figures 3 to 6The delay assembly includes: a pressing rod 11, a spring 12, an elastic strip 13, and a friction block 14. The pressing rod 11 is slidably connected to the L-shaped member 6. The upper end of the pressing rod 11 is provided with a spherical head 111, which is used to contact the waste material under the punch. The spring 12 is located between the pressing rod 11 and the L-shaped member 6. The elastic strip 13 is located inside the L-shaped member 6. The right end of the elastic strip 13 is fixed to the L-shaped member 6, and the remaining parts of the elastic strip 13 are slidably connected to the L-shaped member 6. The right side of the elastic strip 13 is provided with an upwardly curved arc protrusion. The pressing rod 11 is used to press the arc protrusion of the elastic strip 13 to deform the elastic strip 13 and extend it to the left. The lower part of the friction block 14 is fixed to the left end of the elastic strip 13. In the top-to-bottom direction, the friction block 14 and the pressing rod 12 are connected. The horizontal spacing of 1 gradually decreases, and the lower side of the friction block 14 contacts the L-shaped part 6. The friction block 14 is used to contact the lower mold base 4 and provide friction. After the friction block 14 contacts the lower mold base 4, the friction in the upper and lower directions is different. That is, the friction when the friction block 14 moves downward is less than the friction when the friction block 14 moves upward. When the spring 12 and the elastic bar 13 are both compressed to the limit state (the limit state here refers to the state in which the spring 12 and the elastic bar 13 are compressed and the deformation is the largest in this device, rather than the limit state that can be compressed after being taken out separately), the elastic force generated by the two is not enough to overcome the elastic force of the swing spring rod 8. Only by using the force of the punch moving downward can the elastic force of the swing spring rod 8 be overcome and the mounting ring 7 and the limiting ring 10 move relative to each other.

[0035] See Figure 3 The extrusion rod 11 is located at the eccentricity of the adjacent lower mold 5. Within the same lower mold base 4, the central axis of the extrusion rod 11 is located in the symmetrical plane of the two clamping blocks 9, which reduces the influence of the extrusion rod 11 on the falling waste material, so that the waste material can fall out smoothly from the lower mold base 3 and the lower mold base 4.

[0036] The above settings enable the position of the punch to be sensed by the position of the extrusion rod 11, so that when the punch begins to move upward, the clamping block 9 moves the punch one step higher, thereby using the clamping block 9 to separate the waste from the punch.

[0037] It should be noted that in this embodiment, the swing spring 8 is in direct contact with the limiting ring 10.

[0038] Multi-hole sheet metal stamping process: Start the device and use the servo feeding mechanism to clamp and fix the plate to be stamped. Input the shape to be stamped into the computer control system in a programmed manner. Then, the mold selection system selects the punch on the upper turntable and the mold on the lower turntable 2 according to the shape to be stamped. The mechanical power system drives the selected punch to move up and down reciprocally. When the punch moves down, the ejector plate first contacts the plate and works with the lower mold 5 to clamp the plate. Then the punch extends out of the ejector plate and squeezes the plate. The punch and the lower mold 5 together stamp the plate into the specified shape.

[0039] When the punch penetrates into the lower mold 5, the punch drives the waste material on its lower side to contact the spherical head 111 and squeezes the extrusion rod 11 downward. The extrusion rod 11 first moves downward relative to the L-shaped part 6 and compresses the spring 12. The distance between the extrusion rod 11 and the elastic strip 13 gradually decreases until the extrusion rod 11 contacts the arc-shaped protrusion of the elastic strip 13. As the extrusion rod 11 moves downward, it squeezes the arc-shaped protrusion of the elastic strip 13 downward, causing the left end of the elastic strip 13 to drive the friction block 14 to move to the left. During the leftward movement, the upper part of the friction block 14 contacts the lower mold base 4. Then, the friction block 14 drives the left part of the elastic strip 13 to bend and store force until the extrusion rod 11 can no longer move downward along the L-shaped part 6. The extrusion rod 11 then stops moving downward relative to the L-shaped part 6. At this time, the uppermost point of the spherical head 111 is located between the two clamping surfaces 901.

[0040] After the extrusion rod 11 contacts the L-shaped part 6 on its lower side, as the punch moves downward, the punch pushes the L-shaped part 6 downward through the extrusion rod 11. The L-shaped part 6 drives the mounting ring 7, the swing spring rod 8, and the clamping block 9 to move downward together. The swing spring rod 8 is supported by the limiting ring 10 and swings downward while moving downward, causing the swing spring rod 8 to drive the clamping block 9 to swing inward toward the mounting ring 7. The distance between the two clamping blocks 9 continues to decrease, and finally both clamping surfaces 901 contact the edge of the waste material on the lower side of the punch, thus achieving the clamping of the waste material. The punch stops moving downward and begins to move upward.

[0041] When the L-shaped part 6 moves downward, the L-shaped part 6 drives the friction block 14 to move downward through the elastic strip 13. The upper part of the friction block 14 slides downward along the side of the lower die base 4. When the punch stops moving downward and starts moving upward, the L-shaped part 6, the mounting ring 7, the swing spring rod 8 and the clamping block 9 remain stationary under the action of the friction force between the friction block 14 and the lower die base 4. That is, the two clamping blocks 9 maintain the clamping state of the scrap.

[0042] As the punch stops moving downwards and begins to move upwards, the extrusion rod 11, under the elastic action of the spring 12, moves upwards along with the punch and extrudes the waste material. This causes the waste material to swing about the line connecting the clamping positions of the two clamping blocks 9. During this process, the extrusion rod 11 gradually releases its pressure on the elastic strip 13, allowing the elastic strip 13 to gradually recover its original shape under its own elasticity. The elastic strip 13 first drives the lower part of the friction block 14 to move to the right, restoring the left part of the elastic strip 13 to its original shape and returning the friction block 14 to its initial position relative to the horizontal plane. The angle is adjusted, and then the elastic strip 13 drives the friction block 14 to move to the right, so that the friction block 14 is released from contact with the lower die base 4. At this time, the swing spring rod 8 swings in the opposite direction under its own elastic force, and drives the clamping block 9 to swing, so that the two clamping blocks 9 release the clamping of the waste material. At the same time, the swing spring rod 8 drives the L-shaped part 6 and the mounting ring 7 to move up together until they are reset. Meanwhile, the extrusion rod 11 and the friction block 14 are reset under the elastic action of the spring 12 and the elastic strip 13 respectively. Thus, a single punching is completed. The above steps are repeated when punching again.

[0043] Example 2

[0044] This embodiment, based on embodiment 1, provides an increased travel distance for the clamping block 9 to reduce the wear rate of the punch.

[0045] See Figure 4 and Figure 5 Within the same lower mold base 4, two swing spring rods 8 are fixed to opposite sides with magnifying frames 15. The magnifying frames 15 are in contact with the limiting ring 10, and the angle between the side of the magnifying frames 15 in contact with the limiting ring 10 and the horizontal plane is 15°. The angle between the swing spring rod 8 and the horizontal plane is 60°.

[0046] The above settings enable the vertical displacement of the mounting ring 7 and the limiting ring 10 to be converted into a horizontal displacement by utilizing the contact between the magnifying frame 15 and the limiting ring 10. This reduces the up-and-down reciprocating stroke of the punch and the relative displacement stroke between the punch and the sheet metal, thereby reducing the range of wear during a single punching operation.

[0047] It is important to understand that for punches with regular shapes, if the side that directly contacts the sheet metal is damaged, the damaged punch can be ground flat and reused.

[0048] With attachment Figure 5 The perspective of the main view, the attachment Figure 5The movement of the right half of the swing spring 8 and the magnifying frame 15 explains the above effect: When the mounting ring 7 moves down, the swing spring 8 and the magnifying frame 15 rotate counterclockwise together. Taking the upper side of the mounting ring 7 as the horizontal plane, during the transition from 0° to 90°, the angle change corresponding to the same upward movement gradually decreases, and the projection of the arc corresponding to the same angle in the horizontal direction gradually increases. Based on the above two characteristics, the small vertical distance change between the mounting ring 7 and the limiting ring 10 is first transformed into a large angle change in the magnifying frame 15. At the same time, the large angle change in the magnifying frame 15 is transformed into a large displacement of the swing spring 8 on the horizontal plane projection. In this way, the effect of increasing the movement stroke of the clamping block 9 and reducing the up-and-down reciprocating stroke of the punch is achieved.

[0049] Example 3

[0050] This embodiment improves the stability of the clamping block 9 based on embodiment 1.

[0051] See Figure 4 Two clamping blocks 9 within the same lower mold base 4 are slidably connected to a guide 16.

[0052] The above settings enable the guide 16 to guide the movement path of the clamping block 9, thereby maintaining the stability of the angle between the clamping surface 901 and the horizontal plane, and ensuring the stability of the clamping block 9 after it clamps the waste material, thus improving the reliability of the clamping block 9's method of clamping the waste material.

[0053] Example 4

[0054] This embodiment is a further optimization based on Embodiment 1.

[0055] See Figure 3 The uppermost point of the spherical head 111 is located in the plane of the upper side of the adjacent lower mold 5.

[0056] The above settings enable the ball head 111 to contact the plate material before the waste material leaves the plate material. After the waste material leaves the plate material, the ball head 111 and the lower side of the punch work together to keep the waste material in a stable position, reducing the probability that the waste material will fall directly at the moment the punching ends, and thus reducing the probability that the clamping block 9 will directly clamp the punch.

[0057] Example 5

[0058] This embodiment provides a function to adapt to different punching strokes of the punch, based on embodiment 1.

[0059] See Figures 3 to 5The limiting ring 10 is slidably connected to the lower die base 4. Initially, the limiting ring 10 can remain stationary under the support of the elastic sheet 18 until the clamping block 9 completes the clamping of the waste material. Only then can the limiting ring 10 move down under the extrusion force of the punch. A fixing ring 17 is fixedly connected inside the lower die base 4. An evenly distributed ring of elastic sheets 18 is fixedly connected to the upper side of the fixing ring 17. The elastic sheets 18 are fixedly connected to the adjacent limiting ring 10. The fixing ring 17, the limiting ring 10, the mounting ring 7 and the guide 16 are coaxial.

[0060] The above settings enable the clamping block 9 to adapt to various punching strokes and punching shapes by utilizing the sliding characteristic of the limiting ring 10 within the lower die base 4, thereby improving the practicality of this waste discharge method.

[0061] During the process of the punch pressing the L-shaped part 6, mounting ring 7, swing spring 8 and clamping block 9 downward through the extrusion rod 11, after the clamping block 9 has finished clamping the scrap, if the punch continues to move downward, the punch will directly push the limiting ring 10 downward through the scrap, clamping block 9 and swing spring 8, so that the limiting ring 10 presses the elastic sheet 18 and causes the elastic sheet 18 to bend and deform until the punch stops moving downward and begins to move upward. The steps in embodiment 1 are repeated. Under the action of the friction force between the friction block 14 and the lower die base 4, the L-shaped part 6, mounting ring 7, swing spring 8, clamping block 9 and limiting ring 10 remain temporarily stationary until the friction block 14 loses contact with the lower die base 4. Under the elastic action of the swing spring 8, the L-shaped part 6 and mounting ring 7 move upward relative to the limiting ring 10. The limiting ring 10 moves upward under the elastic action of the elastic sheet 18 until it is reset.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A CNC turret punch press for producing multi-hole sheet metal, characterized in that, include: The main body (1) is equipped with a punch module (101) and a lower turntable (2). The upper side of the lower turntable (2) is fixedly connected to a ring-shaped lower die base (3). The upper side of the lower die base (3) is fixedly connected to a lower die seat (4). The lower die seat (4) is fixedly connected to a lower die (5). The lower die seat (4) is provided with a separation mechanism for separating waste from the punch. The separation mechanism includes: The L-shaped component (6), mounting ring (7), two symmetrically distributed swing springs (8), two symmetrically distributed clamping blocks (9), and limiting ring (10) are provided. The L-shaped component (6) is slidably connected to the lower die base (4). The mounting ring (7) is fixedly connected to the L-shaped component (6). The two swing springs (8) are fixedly connected to the upper side of the mounting ring (7). The two clamping blocks (9) are respectively fixedly connected to the upper ends of the adjacent swing springs (8). The limiting ring (10) is provided in the lower die base (4). The limiting ring (10) is used to make the two swing springs (8) swing and clamp the waste material by the opposing swing of the two clamping blocks (9). The L-shaped component (6) is provided with a delay component for making the clamping blocks (9) drive the waste material to lag behind the punch movement. The delay component includes: The assembly includes an extrusion rod (11), a spring (12), an elastic strip (13), and a friction block (14). The extrusion rod (11) is slidably connected to the L-shaped member (6). The spring (12) is located between the extrusion rod (11) and the L-shaped member (6). The elastic strip (13) is located inside the L-shaped member (6). The extrusion rod (11) is used to extrude the elastic strip (13) to deform and elongate it. The friction block (14) is fixedly connected to the elastic strip (13) and is used to contact the lower die base (4) and provide friction. In the top-to-bottom direction, the horizontal distance between the friction block (14) and the extrusion rod (11) gradually decreases, the lower side of the friction block (14) contacts the L-shaped member (6), and the elastic strip (13) is fixed to the friction block (14) at the lower part of the friction block (14).

2. A CNC turret punch press for multi-hole sheet metal production according to claim 1, characterized in that, The upper end of the extrusion rod (11) is provided with a spherical head (111).

3. A CNC turret punch press for multi-hole sheet metal production according to claim 1, characterized in that, Within the same lower mold base (4), clamping surfaces (901) are provided on the opposing sides of the two clamping blocks (9). The distance between the two clamping surfaces (901) gradually increases from bottom to top. The clamping surfaces (901) are provided with uniformly distributed protrusions to increase the friction between the clamping surfaces (901) and the waste material.

4. A CNC turret punch press for multi-hole sheet metal production according to claim 3, characterized in that, Within the same lower mold base (4), magnifying frames (15) are fixed to the opposite sides of the two swing spring rods (8). The magnifying frames (15) are in contact with the limiting ring (10), and the angle between the side of the magnifying frame (15) in contact with the limiting ring (10) and the horizontal plane is less than 45°. The angle between the swing spring rod (8) and the horizontal plane is greater than 45°.

5. A CNC turret punch press for multi-hole sheet metal production according to claim 4, characterized in that, The two clamping blocks (9) within the same lower mold base (4) are slidably connected to a guide (16).

6. A CNC turret punch press for multi-hole sheet metal production according to claim 2, characterized in that, The uppermost point of the spherical head (111) is located in the plane of the upper side of the adjacent lower mold (5).

7. A CNC turret punch press for multi-hole sheet metal production according to claim 6, characterized in that, The extrusion rod (11) is located at the eccentricity of the adjacent lower mold (5) within the same lower mold base (4), and the central axis of the extrusion rod (11) is located in the symmetrical plane of the two clamping blocks (9).

8. A CNC turret punch press for multi-hole sheet metal production according to claim 7, characterized in that, The limiting ring (10) is slidably connected to the lower mold base (4). A fixing ring (17) is fixedly connected inside the lower mold base (4). An elastic sheet (18) with uniform ring distribution is fixedly connected to the upper side of the fixing ring (17). The elastic sheet (18) is fixedly connected to the adjacent limiting ring (10).

Images