A pneumatic thin sheet metal punching device

Abstract

The utility model discloses a kind of pneumatic thin sheet metal punching device, including punch frame, sliding seat, punch rod, driving assembly and toggle block, the driving assembly includes cylinder sleeve, output rod, first baffle, second baffle, rotary tooth disc and fixed tooth disc, output rod is realized impact and rotation compound motion under the action of compressed air flow.The inside of first baffle is equipped with paddle disc, utilize inlet valve hole and outlet hole to build airflow passage, drive the compound motion of output rod down pressure movement and rotation;Rotary tooth disc and fixed tooth disc meshing form bounce interference, so that output rod generates high-frequency vibration.Punch rod is linked to realize compound stamping by toggle block and connecting rod linkage.The device can realize the efficient punching of thin sheet metal, with the advantages of high hole quality, strong impact stability and wide adaptability, suitable for multi-specification sheet metal processing scene.

Description

Technical Field

[0001] This utility model relates to the technical field of sheet metal punching equipment, specifically a pneumatic thin sheet metal punching device. Background Technology

[0002] Thin sheet metal, due to its lightweight and high strength, is widely used in the manufacturing of electrical appliance housings, automobile bodies, and structural components. The punching process in sheet metal is a crucial step, and its hole-forming accuracy and efficiency directly affect the assembly quality and production cycle time. Currently, sheet metal punching is mainly achieved using mechanical punch presses or simple pneumatic devices combined with molds. While this achieves a certain degree of automation, several technical bottlenecks still exist: On the one hand, most traditional pneumatic punching devices only achieve a single axial linear impact. Their structure is mainly based on a cylinder driving a punch rod. A typical example is a stamping module with a one-way cylinder and spring return structure. Although it can meet some low-precision requirements, when facing thinner or harder sheet metal materials, it is easy to have insufficient impact force, many burrs on the hole edge, workpiece warping and other phenomena during the punching process. The hole consistency is poor and it cannot adapt to the increasingly precise and automated processing scenarios.

[0003] On the other hand, existing equipment typically relies on single-point force application during the punching process, lacking auxiliary rotation or vibration mechanisms. This leads to problems such as stress concentration and frictional heat accumulation between the punch and the sheet metal. Especially in small-diameter high-frequency stamping applications, the die wears quickly, has a short service life, and punching efficiency cannot be further improved. In addition, most current stamping equipment requires frequent die changes or manual position adjustments when adapting to sheet metal of different thicknesses, which is cumbersome and lacks versatility.

[0004] In summary, existing technologies still have significant shortcomings in achieving high-efficiency, low-burr, and compound action stamping. In particular, structural optimization and innovative design are urgently needed to achieve coordinated output of impact, rotation, and vibration actions of the punch through structural design, and to improve the speed and adaptability of sheet metal punching without relying on complex electronic control systems. Utility Model Content

[0005] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted by this utility model is as follows: a pneumatic thin sheet metal punching device, 1. a pneumatic thin sheet metal punching device, characterized in that it includes: a punching frame, a drive assembly and an elbow block, a slide seat is slidably mounted on the surface of the punching frame, and a punch rod is provided on the surface of the slide seat, a guide sleeve is slidably mounted on the inner side of the punch rod, the drive assembly and the elbow block are rotatably mounted on the surface of the slide seat, and a connecting rod is provided on the surface of the elbow block that is rotatably connected to the top end of the punch rod; The drive assembly includes a cylinder liner, an output rod, a first plug plate, and a second plug plate. The first plug plate is slidably mounted inside the cylinder liner. A rotating gear is rotatably mounted on the bottom surface of the first plug plate. A fixed gear is fixedly mounted on the top surface of the second plug plate. The top end of the output rod passes through the second plug plate and the fixed gear, and a paddle disk rotatably fitted inside the first plug plate is fixedly sleeved on the top end of the output rod. An intake valve hole and an exhaust hole are respectively provided on the upper and lower surfaces of the first plug plate. The rotating gear is fixedly sleeved on the surface of the output rod, and the second plug plate is rotatably sleeved on the surface of the output rod. The bottom end of the output rod is rotatably connected to the surface of the toggle block.

[0007] In a preferred embodiment, this invention can be further configured such that the surface of the punching frame is provided with a screw structure for adjusting the position of the slide block, thereby adjusting the initial height of the slide block and the punch rod. This allows for flexible adjustment of the punching height based on the sheet metal thickness and mold configuration, enhancing adaptability.

[0008] In a preferred embodiment, this invention can be further configured such that: the intake valve port allows internal airflow from the top of the cylinder liner to enter the interior of the first plug plate, and the outlet port discharges airflow from the inner wall of the first plug plate to the space between the first and second plug plates. This achieves internal gas guidance and path control, simultaneously realizing the movement of the first plug plate and the rotation of the internal impeller disk.

[0009] In a preferred embodiment, the present invention can be further configured such that the intake valve orifice has a microporous structure to limit the airflow rate.

[0010] Specifically, a high-pressure airflow is input into a compression drive pump connected to the top of the cylinder liner. The airflow pushes the first piston plate to move downward inside the cylinder liner. Part of the airflow enters the interior of the first piston plate through the intake valve hole. After pushing the blade disk and output rod to rotate, it enters the space between the first and second piston plates through the exhaust hole, thereby realizing the synchronous downward pushing and rotation of the output rod.

[0011] In a preferred embodiment, this invention can be further configured such that the upper and lower sides of the impeller disk slide against the inner wall of the first plug plate, and the air intake valve hole and the impeller disk are symmetrically arranged about the origin of the impeller disk's center. This enables a combined linear and rotary motion of the output rod, improving the stability and efficiency of the stamping action. In a preferred embodiment, the present invention can be further configured such that: the opposing surfaces of the rotating toothed disk and the fixed toothed disk are provided with a plurality of radially arranged racks, and the cross-section of each rack is an isosceles obtuse triangle.

[0012] Specifically, when the rotating gear disk rotates with the output rod and rotates relative to the surface of the fixed gear disk, the vibration and impact effect of the output rod is achieved through the meshing action of the rotating gear disk and the rack on the surface of the fixed gear disk.

[0013] In a preferred embodiment, the present invention can be further configured such that: the outer periphery of both the first and second plug plates is provided with piston rings that abut against the inner wall of the cylinder liner, and the bottom end of the cylinder liner is provided with an exhaust hole located at the bottom of the second plug plate.

[0014] The beneficial effects achieved by this utility model are as follows: 1. This utility model, by setting up a cylinder liner, a first plug plate, a second plug plate, an output rod, and a paddle disc, etc., and combining the intake valve hole and the exhaust hole to form an internal airflow circuit, can realize the synchronous output of the axial impact and rotational motion of the output rod; in addition, with the jumping meshing structure between the rotating gear plate and the fixed gear plate, the output rod generates short-cycle vibration impact during rotation, thereby driving the punch rod to achieve compound stamping motion, effectively improving the punching efficiency and hole quality of thin sheet metal, reducing the burr rate of hole walls, and adapting to various complex stamping conditions.

[0015] 2. In this utility model, an adjustable height screw structure is provided between the slide and the punch rod, which facilitates precise adjustment of the stamping stroke according to different sheet thicknesses and improves the adaptability of the structure; a piston ring and exhaust hole structure are provided in the cylinder cavity to ensure airflow sealing and smooth circulation, stabilize the operation of the device, and have good processing versatility and automation performance, making it particularly suitable for the promotion and application of small and medium-sized sheet metal automated production lines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of the connection structure of the drive assembly, toggle block, and punch rod according to one embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of a cylinder liner according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first and second stopper plates according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the rotating toothed disk and the fixed toothed disk according to an embodiment of the present invention.

[0017] Figure label: 100. Punching frame; 110. Slide; 120. Punch rod; 111. Guide sleeve; 200. Drive assembly; 210. Cylinder liner; 220. Output rod; 230. First piston plate; 240. Second piston plate; 250. Rotary gear plate; 260. Fixed gear plate; 231. Intake valve port; 232. Exhaust port; 233. Paddle disc; 300, elbow block; 310, connecting rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0019] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0020] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a pneumatic thin sheet metal punching device.

[0021] Combination Figures 1-5 As shown, the present invention provides a pneumatic thin sheet metal punching device, comprising a punching frame 100, a drive assembly 200, and an toggle block 300, wherein: The punching frame 100 is used to support and guide the overall device structure. A slide block 110 is slidably mounted on it. A punch rod 120 is provided above the slide block 110 for performing punching operations on sheet metal workpieces.

[0022] The punch rod 120 has a guide sleeve 111 inside, which can cooperate with the punch to slide linearly and maintain the guiding accuracy during the impact process.

[0023] The toggle block 300 is installed on one side of the slide block 110, and a connecting rod 310 is connected to its surface. The other end of the connecting rod 310 is rotatably connected to the top of the punch rod 120, so that the punch rod generates impact transmission as it moves with the drive assembly. The bottom end of the output rod 220 is rotatably connected to the surface of the toggle block 300, and the deflection motion of the toggle block 300 is used to amplify the motion pressure of the output rod 220.

[0024] like Figure 2 As shown, the drive assembly 200 mainly includes a cylinder liner 210, an output rod 220, a first piston plate 230, and a second piston plate 240, wherein: The first stopper plate 230 and the second stopper plate 240 are both slidably installed in the inner cavity of the cylinder liner 210; A rotating gear 250 is fixedly installed on the bottom surface of the first stopper plate 230, and a fixed gear 260 is installed on the top surface of the second stopper plate 240. The output rod 220 passes through the second plug plate 240 and the fixed gear plate 260, and its upper end is fixedly connected to the blade plate 233, which is rotatably sleeved inside the first plug plate 230. The first stopper plate 230 is provided with an air inlet valve hole 231 and an air outlet hole 232 on its upper and lower sides, respectively, for the purpose of airflow introduction and discharge; The upper and lower surfaces of the blade disk 233 form a sliding fit with the inner wall of the first plug plate 230, and the intake valve hole 231 and the blade disk 233 are symmetrically arranged along the axis of symmetry to ensure uniform airflow. The first piston plate 230 and the second piston plate 240 are provided with piston ring structures on their outer periphery, which fit and seal against the inner wall of the cylinder liner 210; the bottom of the cylinder liner 210 is provided with a bottom air hole for exhaust.

[0025] like Figure 5 As shown, the rotating toothed disk 250 and the fixed toothed disk 260 are provided with several radially distributed racks on their relative contact surfaces. The racks have an isosceles obtuse triangular cross-section structure to form a jumping interference during rotational meshing, so that the output rod 220 is accompanied by intermittent vibration during rotation.

[0026] Under a typical operating condition, high-pressure gas is introduced from the top of the cylinder liner 210 and pushes the first plug plate 230 downward, which in turn drives the output rod 220 to move and rotate axially. At the same time, the jumping engagement between the rotating gear plate 250 and the fixed gear plate 260 further superimposes the vibration pulse. This compound action is transmitted to the sheet metal through the punch rod 120 to achieve efficient punching operation.

[0027] Furthermore, in this utility model, the surface of the punching frame 100 is also provided with an adjusting screw structure. The user can adjust the structure to raise the position of the slide 110, thereby accurately setting the pre-impact gap between the punch 120 and the sheet metal, improving the fitting accuracy and equipment versatility.

[0028] Furthermore, the inlet valve hole 231 and outlet valve hole 232 in the first plug plate 230 are used to introduce compressed gas and discharge expanded gas respectively, and work together to complete the cycle switching of the internal rotary pneumatic system.

[0029] In this embodiment, the intake valve orifice 231 has a microporous structure, the orifice diameter of which limits the gas flow rate, prevents instantaneous impact in the pneumatic system, and improves the adjustability of airflow control and system stability.

[0030] In this embodiment, the intake valve hole 231 and the blade disk 233 are arranged symmetrically about the center to ensure that the blade disk 233 is subjected to uniform force and rotates stably.

[0031] In this embodiment, the rack structure on the surfaces of the rotating gear disk 250 and the fixed gear disk 260 forms an isosceles obtuse triangle cross section, which generates jumping and locking during the rotational meshing process, realizing the short-cycle vibration transmission of the output rod 220 and effectively improving the stamping frequency.

[0032] In this embodiment, piston rings are provided around the periphery of the first piston plate 230 and the second piston plate 240, and are sealed to the inner wall of the cylinder liner 210. An exhaust port is provided at the bottom of the cylinder to ensure smooth gas circulation and stable transmission of thrust during the operation cycle.

[0033] In summary, this embodiment optimizes traditional punching equipment in terms of structural fit, pneumatic circuit, and vibration control, fully demonstrating the structural innovation and wide applicability of this utility model. The working principle and usage process of this utility model are as follows: This utility model provides a pneumatic thin sheet metal punching device, which mainly relies on pneumatic drive to achieve compound motion of the punch rod 120, including impact linear motion and rotational vibration motion, to complete the efficient punching process of thin sheet metal.

[0034] Before using this device for punching operations, the operator needs to adjust the initial height of the slide block 110 by adjusting the screw structure provided on the punching frame 100 according to the thickness and specific dimensions of the sheet metal to be processed, so as to ensure that the punch rod 120 and the lower die are aligned.

[0035] During operation, high-pressure gas is introduced into the top of the cylinder liner 210 through an external compression pump. The airflow first acts on the top surface of the first plug plate 230, causing it to slide downwards inside the cylinder liner 210. Some of the high-pressure gas enters the interior of the first plug plate 230 through the intake valve hole 231 of the microporous structure arranged on the first plug plate 230, and drives the impeller disk 233 located inside to rotate, thereby driving the output rod 220 to rotate around the axis.

[0036] As the first stopper plate 230 descends, the output rod 220 moves axially and generates rotational torque through the action of the impeller disk 233. A rotating gear disk 250 is fixedly connected to the bottom of the output rod 220. The rotating gear disk 250 meshes with a fixed gear disk 260 mounted on the second stopper plate 240. Since the contact surface between the two is provided with several radial rack structures with isosceles obtuse triangular cross sections, during the rotation of the output rod 220, the rotating gear disk 250 and the fixed gear disk 260 generate periodic jumping meshing, which further induces the output rod 220 to generate a high-frequency vibration impact effect.

[0037] Under the action of this combined motion, the punch rod 120 is driven to achieve periodic downward impact and micro-vibration, enabling it to efficiently penetrate the thin sheet metal plate placed below the device and complete the punching operation.

[0038] Through this working method, the device achieves a high-efficiency combination of impact and vibration, which not only improves punching efficiency but also enhances hole quality. It is suitable for processing thin sheet metal workpieces of various specifications and materials, and has high adaptability and automation. It is especially suitable for promotion and application in small and medium-sized stamping production lines.

[0039] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pneumatic thin sheet metal punching device, characterized in that, include: The punching machine frame (100), drive assembly (200), and toggle block (300) are provided. A slide block (110) is slidably mounted on the surface of the punching machine frame (100), and a punch rod (120) is provided on the surface of the slide block (110). A guide sleeve (111) is slidably mounted on the inner side of the punch rod (120). The drive assembly (200) and the toggle block (300) are rotatably mounted on the surface of the slide block (110). A connecting rod (310) is provided on the surface of the toggle block (300) and rotatably connected to the top end of the punch rod (120). The drive assembly (200) includes a cylinder liner (210), an output rod (220), a first piston plate (230), and a second piston plate (240). The first piston plate (230) is slidably mounted inside the cylinder liner (210). A geared disc (250) is rotatably mounted on the bottom surface of the first piston plate (230). A fixed geared disc (260) is fixedly mounted on the top surface of the second piston plate (240). The top end of the output rod (220) passes through the second piston plate (240) and the fixed geared disc (260). The top end of the output rod (220) is fixedly sleeved with a paddle disk (233) that is rotatably sleeved on the inner side of the first plug plate (230). The upper and lower surfaces of the first plug plate (230) are respectively provided with an air inlet valve hole (231) and an air outlet hole (232). The rotating gear disk (250) is fixedly sleeved on the surface of the output rod (220), and the second plug plate (240) is rotatably sleeved on the surface of the output rod (220). The bottom end of the output rod (220) is rotatably connected to the surface of the toggle block (300).

2. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The punching frame (100) has a screw structure on its surface for adjusting the position of the slide (110) and adjusting the initial height of the slide (110) and the punch (120).

3. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The intake valve hole (231) is used to allow the internal airflow of the top of the cylinder liner (210) to flow into the interior of the first plug plate (230), and the exhaust hole (232) is used to discharge the airflow from the inner wall of the first plug plate (230) to the space between the first plug plate (230) and the second plug plate (240).

4. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The intake valve orifice (231) has a microporous structure and is used to limit the airflow rate.

5. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The upper and lower sides of the blade disk (233) slide against the inner wall of the first plug plate (230), and the air intake valve hole (231) and the blade disk (233) are symmetrically arranged about the center point of the blade disk (233).

6. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The rotating toothed disk (250) and the fixed toothed disk (260) are provided with several radially arranged toothed racks on their opposite surfaces, and the cross-section of each toothed rack is an isosceles obtuse triangle.

7. The pneumatic thin sheet metal punching device according to claim 1, characterized in that, The outer periphery of the first plug plate (230) and the second plug plate (240) are provided with piston rings that abut against the inner wall of the cylinder liner (210), and the bottom end of the cylinder liner (210) is provided with an exhaust hole located at the bottom of the second plug plate (240).

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