A light-load punching device

Abstract

This invention discloses a light-load punching device, including a punching machine, a pressing block and a mounting base on the punching machine, a lower die fixed on the mounting base, an upper die on the pressing block, the upper die including a fixed plate with a guide sleeve on the fixed plate, a guide post on the lower die, a support plate below the fixed plate, and a right edge punching part, a plate clamping punching part and a left edge punching part on the bottom surface of the support plate. The plate clamping punching part includes a guide block, and a circular guide hole is opened on the support plate. A punching post is inserted into each first insertion hole, and a limiting block is provided at the top of each punching post. A blind hole is provided on the top surface of each circular guide hole, and a compression spring is provided between the top surface of each blind hole and the top surface of each limiting block. A longitudinal punching channel hole is opened on the lower die. This invention adopts a wave-like graded punching method, which can reduce energy consumption, increase the accuracy and processing efficiency of the punched products, and greatly reduce production costs, making it worthy of widespread application.

Description

Technical Field

[0001] This invention relates to the field of tooling, and more particularly to a light-load punching device. Background Technology

[0002] Blanking is a stamping process that uses a die to separate part of the material or workpiece from another part of the material, workpiece, or scrap. Blanking is a general term for separation processes such as shearing, blanking, punching, notching, grooving, slitting, chiseling, trimming, tongue cutting, cutting, and finishing.

[0003] During the manufacturing process of switch cabinet housings, the sheet metal needs to be cut and punched. Traditionally, cutting and punching are carried out simultaneously. This method results in extremely high punching resistance, requiring a large-scale stamping press and greater pressure to punch out the finished product, leading to higher power consumption. Moreover, the finished product produced by this simultaneous punching may experience localized deformation (punching stress is concentrated at the sheet metal in a short period of time), necessitating the addition of a flattening process in subsequent processing. This not only greatly increases the complexity of finished product processing and energy consumption but also significantly increases the production cost of the product, hindering its efficient utilization over a large area.

[0004] Chinese utility model patent CN 211191590 U discloses a sheet metal punching device. The device includes a main body, an electromagnetic slide rail installed inside the main body, a lifting rod connected to the outside of the electromagnetic slide rail, a slot inside the lifting rod, an auxiliary mechanism installed at the output end of the lifting rod, a mounting plate inside the auxiliary mechanism, a blade plate installed on the outside of the mounting plate, an elastic tube installed inside the mounting plate, a locking block connected to the outside of the elastic tube, a spring connected to the outside of the mounting plate, and a stop block connected to the output end of the spring. A fixing mechanism is installed inside the main body. This device operates synchronously, which is not conducive to energy saving and reducing production costs. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art by providing a lightweight punching device that performs segmented punching and piercing, requires small equipment, consumes low power, does not cause local deformation of finished products, and has low production costs. This device meets the requirements for low power consumption, high precision, and low production costs in sheet metal punching.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: This light-load punching device includes a punching machine, a pressing block and a mounting base are provided on the punching machine, a lower die is fixed on the mounting base, an upper die is installed on the pressing block, the upper die includes a fixing plate fixed together with the bottom surface of the pressing block, guide sleeves are fixed at the four corners of the fixing plate, guide posts that cooperate with the guide sleeves are fixed at the four corners of the lower die, a support plate is fixed below the fixing plate, and a right edge punching part, a plate clamping punching part and a left edge punching part of the plate are fixed on the bottom surface of the support plate. The plate clamping punching part includes a set of guide blocks fixed between the fixing plate and the support plate, a set of first insertion holes are opened on the support plate, and a circular guide hole with a cross-section larger than the first insertion hole is opened on each guide block. A punching post is inserted into each first insertion hole. Each column has a fixed limiting block at its top, which is inserted into a circular guide hole. Each circular guide hole has a concave blind hole on its top surface. A compression spring is installed between the top surface of each blind hole and the top surface of each limiting block. The lower die has longitudinal punching channel holes that correspond to the shape and position of the right edge punching part, the plate pressing punching part, and the left edge punching part of the plate. The top surface of the lower die has plate positioning columns arranged in a four-corner direction. The inner contour formed by each plate positioning column is a cone shape with a larger outer surface and a smaller inner surface. The first distance between the bottom surface of the punching column and the bottom surface of the support plate is greater than the second distance between the bottom surface of the right edge punching part of the plate and the bottom surface of the support plate. The second distance between the bottom surface of the right edge punching part of the plate and the bottom surface of the support plate is greater than the third distance between the bottom surface of the left edge punching part of the plate and the bottom surface of the support plate. The functions of the fixing plate, guide sleeve, support plate, right edge punching section, sheet metal clamping punching section, guide block, first insertion hole, punching post, limit block, blind hole, and compression spring are to enable wave-like, staged punching and punching of the sheet metal, requiring less press power and producing high-quality finished products. The lower die and longitudinal punching channel hole allow the punched and cut waste material to fall to designated positions. The sheet metal positioning posts and cones facilitate the convenient and rapid placement of the blank sheet metal into the square-shaped positioning posts, greatly improving the accuracy and efficiency of blank sheet metal placement. The first distance between the bottom surface of the punching column and the bottom surface of the support plate is greater than the second distance between the bottom surface of the right edge punching part of the sheet metal and the bottom surface of the support plate. The second distance between the bottom surface of the right edge punching part of the sheet metal and the bottom surface of the support plate is greater than the third distance between the bottom surface of the left edge punching part of the sheet metal and the bottom surface of the support plate. This ensures that when cutting the edge of the blank sheet metal using the right edge punching part, the blank sheet metal is first pressed down by the punching columns before cutting, which improves cutting accuracy. Similarly, when cutting the edge of the blank sheet metal using the left edge punching part, the blank sheet metal is first pressed down by the punching columns before cutting. The guide columns and guide sleeves ensure that the upper die moves down with precise positioning. The third punching area includes square holes, round holes, and holes of other shapes.

[0007] To further improve the design, a first self-lubricating layer made of tin bronze is provided on the inner contour of each circular guide hole. The function of this first self-lubricating layer is to reduce frictional resistance and ensure smooth operation when the limiting block moves at the circular guide hole, thus preventing jamming.

[0008] To further improve the design, each blanking post has a second self-lubricating layer made of tin bronze on its surface. The function of this second self-lubricating layer is to reduce the friction between the blanking post and the blank through the hole after the blanking post passes through it. This prevents the finished blank from being pulled upwards when the blanking post moves upwards, allowing for smooth separation between the finished blank and the blanking post.

[0009] Further improvements include a longitudinal discharge hole located below the longitudinal punching channel hole on the mounting base. A bracket is positioned below the discharge hole, with pulleys mounted on both sides of the bracket. A conveyor belt connects the two pulleys, and a servo motor is fixed to the bracket to drive either pulley. The purpose of the longitudinal discharge hole, bracket, pulleys, conveyor belt, and servo motor is to allow the punched waste material to fall through the longitudinal discharge hole onto the conveyor belt, thus transporting it to a designated location for collection and preventing accumulation at the mounting base.

[0010] Further improvements include the addition of noise-reducing buffer pads fixed to the top surface of each circular guide hole. The purpose of these buffer pads is to prevent the limiting block from directly colliding with the top surface of the circular guide hole, thus avoiding loud noise. The buffer pads effectively reduce noise generation.

[0011] To further improve the design, electromagnets are fixed to the sides of each plate positioning post. The function of these electromagnets is to hold and fix the blank plate at the plate positioning post, preventing it from shifting during processing. They also prevent the blank from being pulled upwards when the blanking post detaches from the blanking product.

[0012] Further improvements include the addition of adjustable feet at all four corners of the bottom of the stamping press. These adjustable feet ensure greater stability of the press body, preventing wobbling during punching and providing better performance on uneven surfaces.

[0013] The beneficial effects of this invention are:

[0014] 1) Through the fixed plate, guide sleeve, support plate, right edge punching part, sheet metal pressing punching part, guide block, first insertion hole, punching column, limit block, blind hole, and compression spring, the sheet metal can be punched and punched in a wave-like stage. The required punching press power is small and the quality of the punched finished product is high.

[0015] 2) The waste material from punching and cutting can be dropped to a designated position through the lower die and the longitudinal punching channel hole;

[0016] 3) The positioning columns and cones of the sheet metal allow for convenient and quick placement of the sheet metal;

[0017] 4) The falling waste material can be collected and reused through the longitudinal discharge hole, bracket, pulley, conveyor belt, and servo motor. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a perspective view of the upper and lower mold areas in this invention;

[0020] Figure 3 This is a front view of the upper and lower mold areas in this invention;

[0021] Figure 4 This is a perspective view of the upper mold area in this invention;

[0022] Figure 5 This is a perspective view of the lower mold area in this invention;

[0023] Figure 6 for Figure 2 AA cross-section view;

[0024] Figure 7 This is a schematic diagram of the compression spring region in this invention;

[0025] Figure 8 for Figure 5 A magnified view of a portion of region B;

[0026] Figure 9 This is a schematic diagram of the punched finished product structure of the present invention;

[0027] Figure 10 This is a flowchart illustrating the working principle of the punching process of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Pressing machine; 1-1. Pressing block; 1-2. Mounting base; 1-3. Adjusting foot; 2. Lower die; 2. Guide post; 2-1. Longitudinal punching channel hole; 2a. Cone; 2-2a. Upper die; 3. Fixed plate; 3-1. Guide sleeve; 3-1a. Support plate; 3-2. Right edge punching section; 3-2a. Sheet metal pressing punching section; 3-2b. Guide block; 3a-2b. Left edge punching section; 3-2c. Punching post; 3-2d. Limiting block; 3-2e. Blind hole; 3-2. f, compression spring 3-2g, first self-lubricating layer 3-2h, second self-lubricating layer 3-2j, first insertion hole 3-2k, circular guide hole 3-2m, bracket 4, pulley 5, conveyor belt 6, servo motor 7, noise reduction buffer pad 8, electromagnet 9, first spacing a, second spacing b, third spacing c, punched finished product 10, first punching area 10-1, second punching area 10-2, third punching area 10-3, blank plate 11. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Referring to the attached diagram: This light-duty blanking device includes a stamping press 1. A pressing block 1-1 and a mounting base 1-2 are mounted on the stamping press 1. A lower die 2 is fixed on the mounting base 1-2. An upper die 3 is mounted on the pressing block 1-1. The upper die 3 includes a fixing plate 3-1 fixed to the bottom surface of the pressing block 1-1. Guide sleeves 3-1a are fixed at each of the four corners of the fixing plate 3-1. Guide posts 2-1 that mate with the guide sleeves 3-1a are fixed at each of the four corners of the lower die 2. A support plate 3-2 is fixed below the fixing plate 3-1. The bottom surface of plate 3-2 is fixed with a right edge punching part 3-2a, a plate pressing punching part 3-2b, and a left edge punching part 3-2c. The plate pressing punching part 3-2b includes a set of guide blocks 3a-2b fixed between the fixed plate 3-1 and the support plate 3-2. The support plate 3-2 has a set of first insertion holes 3-2k. Each guide block 3a-2b has a circular guide hole 3-2m with a cross-section larger than that of the first insertion hole 3-2c. Each first insertion hole 3-2k is inserted with a punching post 3-2d. The top of each of the cutting columns 3-2d is fixed with a limiting block 3-2e, which is inserted into the circular guide hole 3-2m. Each circular guide hole 3-2m has a concave blind hole 3-2f on its top surface. A compression spring 3-2g is installed between the top surface of each blind hole 3-2f and the top surface of each limiting block 3-2e. The lower die 2 has a longitudinal punching channel hole 2a corresponding to the shape and position of the right edge punching part 3-2a, the plate clamping punching part 3-2b, and the left edge punching part 3-2c of the plate. The top surface of the lower die 2 is fixed. There are plate positioning posts 2-2 arranged in a four-corner direction. The inner contour formed by each plate positioning post 2-2 is a cone shape 2-2a with a larger outer diameter and a smaller inner diameter. The first distance a between the bottom surface of the punching post 3-2d and the bottom surface of the support plate 3-2 is greater than the second distance b between the bottom surface of the right edge punching part 3-2a of the plate and the bottom surface of the support plate 3-2. The second distance b between the bottom surface of the right edge punching part 3-2a of the plate and the bottom surface of the support plate 3-2 is greater than the third distance c between the bottom surface of the left edge punching part 3-2c of the plate and the bottom surface of the support plate 3-2.

[0031] Each circular guide hole 3-2m has a first self-lubricating layer 3-2h made of tin bronze material on its inner contour.

[0032] Each punching post 3-2d has a second self-lubricating layer 3-2j made of tin bronze on its surface.

[0033] The mounting base 1-2 has a longitudinal discharge hole 1-2a. A bracket 4 is provided below the longitudinal discharge hole 1-2a. Pulleys 5 are installed on both sides of the bracket 4. A conveyor belt 6 is installed between the two pulleys 5. A servo motor 7 that drives any one of the pulleys 5 to rotate is fixed on the bracket 4.

[0034] Noise-reducing buffer pads 8 are fixed on the top surface of each circular guide hole 3-2m.

[0035] Electromagnets 9 are fixed to the sides of the positioning columns 2-2 of each plate.

[0036] Adjustable feet 1-3 are fixed at the four corners of the bottom of the stamping machine 1.

[0037] The working principle of this invention is as follows: When blank sheet 11 needs to be punched, simply place the blank sheet 11 into the sheet positioning block 2-2. Then, activate the electromagnet 9 to hold the four corners of the blank sheet 11. Next, start the punching machine 1. The pressing block 1-1 on the punching machine 1 moves down. Since the first distance a between the bottom surface of the punching column 3-2d and the bottom surface of the support plate 3-2 is greater than the second distance b between the bottom surface of the right edge punching part 3-2a of the sheet and the bottom surface of the support plate 3-2, each punching column 3-2d presses down on the blank sheet 11. Since each punching column 3-2d is inserted into the first insertion hole 3-2k and the limiting block 3-2e is inserted into the circular guide hole 3-2m, when the pressing block 1- As the plate continues to move downwards, each compression spring 3-2g is compressed and stored by each limiting block 3-2e. After a certain movement, the right edge punching section 3-2a of the plate will cut off the first punching area 10-1 of the blank plate 11. As the pressing block 1-1 continues to move downwards, the left edge punching section 3-2a of the plate will cut off the second punching area 10-2 of the blank plate 11. As the pressing block 1-1 continues to move downwards, the limiting block 3-2e on the punching column 3-2d touches the noise reduction buffer pad 8 and stops through the bottom surface of the circular guide hole. At this time, after the pressing block 1-1 continues to move downwards, each punching column 3-2d will punch out holes in each of the third punching areas 10-3, thereby completing the processing of the punched finished product 10 (e.g., Figure 10 As shown), finally, the pressing block 1-1 moves upward quickly, causing the right edge punching part 3-2a, the plate pressing punching part 3-2b, and the left edge punching part 3-2c of the plate to move upward quickly and reset. The punched waste is transported to the designated position by the conveyor belt 6. The present invention adopts a wave-like graded punching method, which can reduce energy consumption, increase the accuracy and processing efficiency of the punched finished product 10, and greatly reduce production costs. It is worth promoting and applying.

[0038] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A light-duty blanking device, comprising a stamping press (1), characterized in that: The stamping machine (1) is provided with a pressing block (1-1) and a mounting base (1-2). A lower die (2) is fixed on the mounting base (1-2). An upper die (3) is installed on the pressing block (1-1). The upper die (3) includes a fixing plate (3-1) fixed together with the bottom surface of the pressing block (1-1). Guide sleeves (3-1a) are fixed at all four corners of the fixing plate (3-1). Guide sleeves (3-1a) are fixed at the four corners of the lower die (2). A guide post (2-1) is fitted with a sleeve (3-1a). A support plate (3-2) is fixed below the fixed plate (3-1). The bottom surface of the support plate (3-2) is fixed with a right edge punching part (3-2a), a plate pressing punching part (3-2b), and a left edge punching part (3-2c). The plate pressing punching part (3-2b) includes a set of guide blocks (3a-) fixed between the fixed plate (3-1) and the support plate (3-2). 2b) A set of first insertion holes (3-2c) are opened on the support plate (3-2). Each of the guide blocks (3a-2b) has a circular guide hole (3-2m) with a cross-section larger than that of the first insertion hole (3-2k). A punching post (3-2d) is inserted into each of the first insertion holes (3-2k). The top of each punching post (3-2d) is fixed with a limiting block (3-2e) that is respectively inserted into the circular guide hole (3-2m). The top surface of each circular guide hole (3-2m) is provided with a concave blind hole (3-2f). A compression spring (3-2g) is installed between the top surface of each blind hole (3-2f) and the top surface of each limiting block (3-2e). The lower die (2) is provided with a longitudinal punching channel hole (2a) corresponding to the shape and position of the right edge punching part (3-2a), the plate pressing punching part (3-2b), and the left edge punching part (3-2c) of the plate. The top surface of the lower mold (2) is fixed with plate positioning columns (2-2) arranged in a four-corner direction, and the inner contour formed by each plate positioning column (2-2) is a cone shape with a larger outer diameter and a smaller inner diameter (2-2a). The first distance (a) between the bottom surface of the punching column (3-2d) and the bottom surface of the support plate (3-2) is greater than the second distance (b) between the bottom surface of the right edge punching part (3-2a) of the plate and the bottom surface of the support plate (3-2), and the second distance (b) between the bottom surface of the right edge punching part (3-2a) of the plate and the bottom surface of the support plate (3-2) is greater than the third distance (c) between the bottom surface of the left edge punching part (3-2c) of the plate and the bottom surface of the support plate (3-2).

2. The light-load punching device according to claim 1, characterized in that: Each of the circular guide holes (3-2m) has a first self-lubricating layer (3-2h) made of tin bronze material on its inner contour.

3. The light-load punching device according to claim 2, characterized in that: Each of the aforementioned punching posts (3-2d) has a second self-lubricating layer (3-2j) made of tin bronze material on its surface.

4. The light-load punching device according to claim 1, characterized in that: The mounting base (1-2) has a longitudinal material drop hole (1-2a). A bracket (4) is provided below the longitudinal material drop hole (1-2a). Pulleys (5) are installed on both sides of the bracket (4). A conveyor belt (6) is installed between the two pulleys (5). A servo motor (7) that drives any one of the pulleys (5) to rotate is fixed on the bracket (4).

5. A light-load punching device according to claim 1, characterized in that: Each of the circular guide holes (3-2m) has a noise reduction buffer pad (8) fixed on its top surface.

6. The light-load punching device according to claim 1, characterized in that: Each of the plate positioning columns (2-2) is fixed with an electromagnet (9) on its side.

7. A light-load punching device according to claim 1, characterized in that: The bottom four corners of the press (1) are all fixed with adjusting feet (1-3).

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