Die for punching and trimming reverse burr processing of plate

Abstract

This utility model relates to the field of stamping die technology, and more particularly to a die for punching and trimming reverse burrs on sheet metal. It includes an upper die assembly and a lower die assembly arranged vertically. The upper die assembly includes an upper die base fixedly mounted on the top of an upper die plate, a stripper plate fixed to the bottom of the upper die plate by bolts, several sets of elastic pressure blocks embedded in the stripper plate, and punching cutters respectively disposed at both ends of the stripper plate. The lower die assembly includes a lower die plate fixedly mounted on a base, limiting devices disposed on both sides of the lower die plate, grooves embedded inside the lower die plate, bearing pads respectively disposed at both ends of the lower die plate, and lower cutting plate cutters disposed at both ends of the bearing pads corresponding to the punching cutters. The beneficial effect of this utility model is that, through optimized structural design, it achieves the requirement of punching burrs facing inwards and trimming burrs facing outwards, reducing subsequent processing steps.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a die for punching holes and cutting reverse burrs on sheet metal. Background Technology

[0002] With the development of mold processing technology, sheet metal punching and trimming processes are increasingly widely used in industrial production. However, in practice, existing mold designs still have some problems. For example, punching and trimming molds currently on the market usually cannot simultaneously meet the requirements of inward-facing punching burrs and outward-facing trimming burrs, resulting in additional processing steps required during subsequent welding or installation, which not only increases production costs but also reduces production efficiency. Currently, the method used is to first punch holes using a continuous stamping die, and then punch and cut the ends. However, the manufacturing cost of continuous dies is high. Another existing technology is to use two different sets of dies for processing, one for punching holes and the other for punching the ends. This method is inefficient. The existing sheet metal stamping process has unique requirements. The burrs for punching the sheet metal need to face inwards to prevent them from scratching workers during later installation or manual operation, thus providing protection. The burrs at both ends need to face outwards so that they can protrude for welding. If the burrs face inwards, they will form an inner groove after welding, affecting aesthetics and practicality. Therefore, it is necessary to design a one-time forming mold that can perform punching and cutting in one operation, with the punching burrs facing inwards and the cutting burrs facing outwards.

[0003] Existing technology, patent document CN102806265B, discloses a punching die, published on November 26, 2014. This die includes a punch, a die cavity, and a lower die base. By setting multiple scrap cutters and corresponding cutting edges on the lower die base, it achieves the segmented cutting and rapid discharge of scrap. While this design effectively solves the problem of scrap accumulation, the burr direction during punching and trimming is consistent, failing to meet the specific requirement of inward-facing punching burrs and outward-facing trimming burrs.

[0004] Therefore, it is necessary to design a mold for punching and deburring the reverse edges of sheet metal to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a mold for punching and trimming reverse burrs on sheet metal, in order to overcome the above-mentioned shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A mold for punching and deburring sheet metal includes an upper mold assembly and a lower mold assembly arranged correspondingly on the top and bottom. The upper mold assembly includes an upper mold base fixedly mounted on the top of an upper template, a stripper plate fixed to the bottom of the upper template by bolts, several sets of elastic pressure blocks embedded in the stripper plate, and punching cutters respectively disposed at both ends of the stripper plate. The lower mold assembly includes a lower template fixedly mounted on a base, limiting devices disposed on both sides of the lower template, grooves embedded inside the lower template, bearing pads respectively disposed at both ends of the lower template, and lower cutting plate cutters disposed at both ends of the bearing pads corresponding to the punching cutters. A rigid spring is disposed between the punching cutter and the upper template, and the height of the lower cutting plate cutter is higher than that of the bearing pad.

[0007] Preferably, the elastic pressure block is connected to the stripper plate via a spring mechanism and is capable of telescopic movement in the vertical direction, and the punching tool is fixedly connected to the upper template via a positioning pin.

[0008] Preferably, a side-blowing device is also provided inside the bearing pad. The side-blowing device includes an airflow channel opened inside the bearing pad, a nozzle embedded at the outlet of the airflow channel, and an external air source interface communicating with the airflow channel.

[0009] Preferably, a waste collection trough is provided at the bottom of the groove of the lower template.

[0010] Preferably, the upper mold assembly and the lower mold assembly are connected by a guide post. One end of the guide post is fixed to the bottom of the upper mold base, and the other end is inserted into the guide hole of the lower mold plate. A rolling bearing is provided between the guide post and the guide hole.

[0011] Preferably, the punching cutter and the bearing pad are arranged vertically correspondingly, and the lower cutting plate cutter and the punching cutter are staggered.

[0012] The beneficial effects of this utility model are as follows: The elastic pressure block in this technical solution applies downward pressure under the action of the spring mechanism, cooperating with the groove of the lower template to complete the punching operation, while simultaneously generating inward punching burrs. The lower cutting plate cutter cuts upward into the plate during the punching process, causing the cut edge burrs to generate outward, thus achieving the requirement of inward punching burrs and outward cut edge burrs. Furthermore, a limiting device is set to limit the plate, preventing it from shifting during processing. Attached Figure Description

[0013] Fig. 1 This is a schematic diagram of the structure of a mold for punching and trimming reverse burrs on sheet metal according to the present invention; Fig. 2 This is a partial enlarged view of the punching tool of a die for punching and trimming reverse burrs on sheet metal according to the present invention. Fig. 3 This is a partial cross-sectional view of a mold for punching and trimming reverse burrs on sheet metal according to the present invention. In the diagram: 1. Upper mold base; 2. Upper template; 3. Stripper plate; 4. Elastic pressure block; 5. Punching cutter; 51. Lower cutting plate cutter; 52. Rigid spring; 6. Lower template; 7. Limiting device; 8. Groove; 9. Bearing pad; 10. Side blowing device; 11. Airflow channel; 12. Nozzle; 14. Guide post. Detailed Implementation

[0014] Reference Figs. 1 to 3 A die for punching and deburring sheet metal includes an upper die assembly and a lower die assembly arranged correspondingly on the top and bottom. The upper die assembly includes an upper die base 1 fixedly installed on the top of an upper template 2, a stripper plate 3 fixed to the bottom of the upper template 2 by bolts, several sets of elastic pressure blocks 4 embedded in the stripper plate 3, and punching cutters 5 respectively arranged at both ends of the stripper plate 3. The lower die assembly includes a lower template 6 fixedly installed on a base, limiting devices 7 arranged on both sides of the lower template 6, grooves 8 embedded in the interior of the lower template 6, bearing pads 9 respectively arranged at both ends of the lower template 6, and lower cutting plate cutters 51 arranged at both ends of the bearing pads 9 corresponding to the punching cutters 5.

[0015] The upper mold base 1 is fixedly mounted on the top of the upper template 2 by bolts, and the bottom of the upper template 2 is fixed with a stripper plate 3 by bolts. Several sets of elastic pressure blocks 4 are embedded in the stripper plate 3. The elastic pressure blocks 4 are connected to the stripper plate 3 by a spring mechanism and can extend and retract in the vertical direction. Punching cutters 5 are respectively provided at both ends of the stripper plate 3. The punching cutters 5 are fixedly connected to the upper template 2 by positioning pins to ensure stability during the punching process. The ends of the elastic pressure blocks 4 have a tapered structure, applying downward pressure during punching to generate burrs inward.

[0016] A rigid spring 52 is provided between the punching cutter 5 and the upper template. The rigid spring provides stable support force, allowing the punching cutter 5 to fall first and press against the support pad 9, restricting the sheet material. At the same time, the lower cutting plate cutters 51 on both sides act to punch both sides. The lower cutting plate cutters 51 are staggered from the punching cutter 5, and the height of the lower cutting plate cutters 51 is higher than that of the support pad 9, which is higher than the thickness of the sheet material to be punched.

[0017] In the lower mold assembly 6, the lower mold plate 6 is fixedly installed on the base, and limit devices 7 are provided on both sides of it. The limit devices 7 are fixed to both sides of the lower mold plate 6 by threaded connection, and are used to limit the plate material to prevent displacement during processing. The limit device 7 includes a limit post and a buffer sleeve sleeved on the outside of the limit post. The buffer sleeve is made of elastic material and plays a buffering role during the placement of the plate material to avoid damage to the surface of the plate material.

[0018] The lower template 6 has a recessed groove 8 embedded inside, the shape of which matches the end of the elastic pressure block 4, for use in conjunction with the elastic pressure block 4 to complete the punching operation. Bearing pads 9 are respectively provided at both ends of the lower template 6. The bearing pads 9 are used to cooperate with the punching cutter 5, pressing down on the side of the sheet metal together. The height of the lower cutting plate cutter 51 is not lower than the surface of the bearing pad 9, and corresponds to the position of the cutting edge of the punching cutter 5, to ensure that the cutting edge of the punching cutter 5 can accurately cut into the sheet metal, ensuring that the burrs on the cut edge are generated upwards.

[0019] The lower template 6 also has a waste collection trough located at the bottom of the groove 8, used to collect waste generated during the punching process. The waste collection trough is connected to an external waste bin via an inclined guide surface, facilitating automatic waste discharge. A removable baffle is installed at the bottom of the waste collection trough, connected to the lower template by snap-fit ​​mechanisms for quick disassembly and installation. The baffle is made of stainless steel, offering good corrosion resistance and durability. The inclined guide surface of the waste collection trough has an angle between 15° and 20° to ensure rapid waste discharge. This is the existing structure, described again, and is not shown in the figure.

[0020] The support pad 9 is internally equipped with a side-blowing device 10. The side-blowing device 10 includes an airflow channel 11 formed inside the support pad 9, a nozzle 12 embedded at the outlet of the airflow channel 11, and an external air source interface communicating with the airflow channel 11. The diameter of the airflow channel 11 is between 5mm and 8mm to ensure the stability and intensity of the airflow. The outlet direction of the nozzle 12 faces outwards from the support pad 9, used to blow the trimmed waste material out of the mold area. The outlet angle of the nozzle 12 is between 30° and 45° to ensure that the waste material is effectively blown out of the mold area. The external air source interface is connected to a compressed air system via a hose, and the air pressure value within the airflow channel 11 can be adjusted by an external control system.

[0021] The upper mold assembly and the lower mold assembly are connected by guide pillars 14. One end of the guide pillar 14 is fixed to the bottom of the upper mold base 1, and the other end is inserted into the guide hole of the lower mold plate 6. A rolling bearing is provided between the guide pillar 14 and the guide hole to reduce friction during the mold closing process. There are four guide pillars 14, evenly distributed at the four corners of the upper mold base 1 to ensure stability during the mold closing process. The surface of the guide pillar 14 is chrome-plated to improve its wear resistance and corrosion resistance. A lubrication groove is provided in the middle of the guide pillar 14 to store lubricating oil. The width of the lubrication groove is between 2mm and 3mm to ensure its lubrication effect.

[0022] In practice, when punching and deburring metal sheets, the sheet to be processed is first placed on the lower template 6. The limiting device 7 limits the sheet through a buffer sleeve on its outer side, ensuring that the sheet does not shift during processing.

[0023] Subsequently, the external drive device moves the upper mold assembly downwards, and the guide pillars 14 ensure precise alignment between the upper mold assembly and the lower mold assembly. There are four guide pillars 14, evenly distributed at the four corners of the upper mold base 1, and rolling bearings are provided between the guide pillars 14 and the guide holes of the lower mold plate 6 to reduce friction during the mold closing process.

[0024] When the upper die assembly moves downwards to approach the sheet metal, the punching cutter 5 is equipped with a rigid spring at its top, so the punching cutter 5 contacts the sheet metal first. At the same time, since the height of the lower cutting plate cutter 51 is higher than that of the bearing pad 9, the punching cutter 5 presses down on the sheet metal and the bearing pad 9 presses down on the sheet metal. The external lower cutting plate cutter 51 acts to cut the edges of the sheet metal. Since the cutting edge is set upwards and forms a certain angle with the upper surface of the sheet metal, this design causes the burrs generated during the cutting process to be generated outwards.

[0025] Then, the elastic pressure block 4 at the bottom of the stripper plate 3 begins to function. The elastic pressure block 4 is connected to the stripper plate 3 via a spring mechanism and can extend and retract vertically. As the upper die assembly continues to press down, the tapered end of the elastic pressure block 4 engages with the groove 8 inside the lower die plate 6 to complete the punching operation. Because the pressure applied by the elastic pressure block 4 is concentrated on the inner area of ​​the sheet metal, the burrs generated during punching are guided to the inner side of the sheet metal, thus achieving the technical effect of inward burr generation during punching.

[0026] After punching and trimming are completed, the side-blowing device 10 is activated, blowing the trimmed waste out of the mold area through the nozzle 12. The air pressure in the airflow channel 11 is regulated by an external control system to ensure moderate airflow intensity, effectively removing waste without causing additional damage to the sheet metal. The outlet angle of the nozzle 12 is between 30° and 45°, a design that ensures waste is quickly blown out of the mold area, preventing waste accumulation from affecting subsequent processing. Through optimized structural design, the special process requirements of punching burrs facing inward and trimming burrs facing outward are achieved, reducing subsequent processing steps and improving production efficiency and product quality.

[0027] The advantages of this invention are that the elastic pressure block applies downward pressure under the action of the spring mechanism, cooperating with the groove of the lower template to complete the punching operation, while simultaneously generating inward punching burrs. The lower cutting plate cutter cuts upward into the plate during the punching process, causing outward burrs on the cut edge, thus achieving the requirement of inward punching burrs and outward cut edge burrs. Furthermore, a limiting device is set to limit the plate, preventing it from shifting during processing.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A die for punching and deburring sheet metal, comprising an upper die assembly and a lower die assembly arranged correspondingly above and below, characterized in that: The upper mold assembly includes an upper mold base fixedly installed on the top of the upper mold plate, a stripper plate fixed to the bottom of the upper mold plate by bolts, several sets of elastic pressure blocks embedded in the stripper plate, and punching cutters respectively disposed at both ends of the stripper plate. The lower mold assembly includes a lower mold plate fixedly installed on the base, limiting devices disposed on both sides of the lower mold plate, grooves embedded in the lower mold plate, bearing pads respectively disposed at both ends of the lower mold plate, and lower cutting plate cutters disposed at both ends of the bearing pads corresponding to the punching cutters. A rigid spring is disposed between the punching cutter and the upper mold plate, and the height of the lower cutting plate cutter is higher than that of the bearing pad.

2. The mold for punching and deburring sheet metal according to claim 1, characterized in that: The elastic pressure block is connected to the stripper plate through a spring mechanism and can extend and retract in the vertical direction. The punching tool is fixedly connected to the upper template through a positioning pin.

3. The mold for punching and trimming reverse burrs on sheet metal according to claim 1, characterized in that: A side-blowing device is also provided inside the bearing pad. The side-blowing device includes an airflow channel opened inside the bearing pad, a nozzle embedded at the outlet of the airflow channel, and an external air source interface connected to the airflow channel.

4. A mold for punching and deburring sheet metal according to claim 1, characterized in that: The bottom of the groove in the lower template is provided with a waste collection trough.

5. A mold for punching and deburring sheet metal according to claim 1, characterized in that: The upper mold assembly and the lower mold assembly are connected by a guide post. One end of the guide post is fixed to the bottom of the upper mold base, and the other end is inserted into the guide hole of the lower mold plate. A rolling bearing is provided between the guide post and the guide hole.

6. A mold for punching and trimming reverse burrs on sheet metal according to claim 1, characterized in that: The punching cutter and the bearing pad are arranged vertically and vertically respectively, and the lower cutting plate cutter and the punching cutter are staggered.

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