Bending die applied to metal plate

Abstract

The utility model relates to the technical field of stamping dies, and discloses a bending die applied to metal plates, which comprises an upper die unit and a lower die unit, the upper die unit is positioned above the lower die unit, a bending punch is mounted in the upper die unit, the lower end of the bending punch is exposed out of the lower end of the upper die unit, and the lower end of the bending punch is connected with the lower die unit. A bending groove allowing the bending punch to stretch into is formed in the position, corresponding to the bending punch, of the upper end of the lower die unit, the upper end of the bending punch is connected with a first oil pipe, a roller pin is installed at the lower end of the bending punch in a rolling mode, and the roller pin is used for making contact with a product in a rolling mode. A first drainage channel is formed in the bending punch and used for guiding lubricating oil of the first oil pipe to the roller pin, and the bending punch has the advantages that the appearance quality of products and the reliability and stability of production are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of stamping dies, and particularly relates to a bending die applied to metal sheets. Background Art

[0002] In the box parts of communication, new energy and electronic products, there is generally a bending feature to meet the requirements of appearance, function or assembly. The part materials involve SPCC, SECC, aluminum, copper, stainless steel, carbon steel, etc. During the bending process of the parts, it is required that there is no chip dropping, abrasion and deformation on the appearance.

[0003] It is found in practical applications that the existing bending punches inevitably exert force on the edge positions of the end faces of product parts during the forming process, and continuously perform extrusion and sliding displacement during the forming process, resulting in the dropping of edge burrs and powder chips, and causing bruises and scratches on the outer side of the bend, damaging the surface appearance of the product and affecting the product manufacturing and finished product quality. Summary of the Utility Model

[0004] In order to solve the deficiencies of the above-mentioned prior art, the utility model provides a bending die applied to metal sheets, achieving the purpose of ensuring the appearance quality of the product, as well as the production reliability and stability.

[0005] The technical purpose to be achieved by the utility model is realized through the following technical solutions:

[0006] The utility model provides a bending die applied to metal sheets, including an upper die unit and a lower die unit, and the upper die unit is located above the lower die unit;

[0007] A bending punch is installed inside the upper die unit, the lower end of the bending punch exposes from the lower end of the upper die unit, and a bending groove for the bending punch to extend into is formed at the upper end of the lower die unit corresponding to the position of the bending punch;

[0008] The upper end of the bending punch is connected with a first oil pipe, a rolling needle is installed at the lower end of the bending punch in a rolling manner, the rolling needle is used for rolling contact with the product, and a first drainage channel is formed inside the bending punch, and the first drainage channel is used for draining the lubricating oil of the first oil pipe to the rolling needle.

[0009] In some implementation manners, a first oil inlet nozzle is arranged between the upper end of the bending punch and the first oil pipe, the first oil inlet nozzle communicates the first oil pipe and the first drainage channel, and through the first oil inlet nozzle, the amount of lubricating oil entering the first drainage channel from the first oil pipe can be better controlled, avoiding adding too much lubricating oil.

[0010] In some implementations, a horizontally extending mounting groove is formed at the lower end of the bending punch, and the needle roller is rotatably mounted in the mounting groove;

[0011] A through hole for communicating with the first drainage channel is formed in the groove wall of the mounting groove. When the needle roller rolls relative to the mounting groove, lubricating oil is attached to the outer surface of the needle roller through the through hole, playing a role in cooling the needle roller and preventing deformation.

[0012] In some implementations, a stepped structure is formed at the lower end of the bending punch relative to the end of the needle roller. The stepped structure is used to limit the depth of the bending punch extending into the bending groove, preventing damage to the product caused by over-stamping.

[0013] In some implementations, a first guiding post is further installed inside the upper die unit. The lower end of the first guiding post protrudes from the lower end of the upper die unit. A first guiding sleeve for the first guiding post to extend into is embedded and installed on the lower die unit to ensure the alignment accuracy of the upper die unit and the lower die unit, so as to ensure the accuracy of the bending operation.

[0014] In some implementations, a second oil pipe is connected to the upper end of the first guiding post. A plurality of circumferentially extending oil guiding grooves are formed on the outer surface of the lower end of the first guiding post. A second drainage channel is formed inside the first guiding post. The second drainage channel is used to drain the lubricating oil of the second oil pipe to the plurality of oil guiding grooves, playing a role in cooling the first guiding post through the lubricating oil, so as to improve the service life.

[0015] In some implementations, a second oil inlet nozzle is arranged between the upper end of the first guiding post and the second oil pipe. The second oil inlet nozzle communicates the second oil pipe and the second drainage channel. Setting the second oil inlet nozzle can better control the amount of oil flowing through the oil guiding groove and avoid adding too much lubricating oil.

[0016] In some implementations, a second guiding post is further installed inside the upper die unit. The lower end of the second guiding post protrudes from the lower end of the upper die unit. A second guiding sleeve for the second guiding post to extend into is embedded and installed on the lower die unit to further ensure the alignment accuracy of the upper die unit and the lower die unit, so as to ensure the accuracy of the bending operation.

[0017] In some implementations, a third oil inlet nozzle is arranged at the upper part of the outer circumference of the second guiding sleeve. The third oil inlet nozzle is connected with a third oil pipe;

[0018] The third oil inlet nozzle communicates with the inside of the second guiding sleeve, playing a role in cooling the second guiding post through the lubricating oil, so as to improve the service life.

[0019] In some implementations, a plurality of ball bearings are mounted on the lower end of the second guiding post in a circumferential rolling manner. The rolling contact is beneficial to reducing pressure and enabling the lubricating oil to play a better role in cooling.

[0020] In summary, the present utility model has at least the following advantages:

[0021] A bending die applied to metal sheets provided by the present utility model rolls and mounts needle rollers at the lower end of a bending punch. The needle rollers are in rolling contact with the product, which is beneficial to reducing pressure. A first drainage channel is provided inside the bending punch to drain the lubricating oil from the first oil pipe to the needle rollers. The lubricating oil adheres to the needle rollers to form a protective film, which plays a role in cooling the needle rollers and preventing deformation, and improves the service life of the needle rollers. Description of the Drawings

[0022] Figure 1 Schematic diagram of the open state of the bending die according to Embodiment 1 of the present utility model;

[0023] Figure 2 Schematic diagram of the closed state of the bending die according to Embodiment 1 of the present utility model;

[0024] Figure 3 Schematic diagram of the structure of the bending punch according to Embodiment 1 of the present utility model;

[0025] Figure 4 Schematic diagram of the open state of the bending die according to Embodiment 2 of the present utility model;

[0026] Figure 5 Schematic diagram of the structure of the first guiding post according to Embodiment 2 of the present utility model;

[0027] Figure 6 Cross-sectional view of the first guiding post according to Embodiment 2 of the present utility model;

[0028] Figure 7 Schematic diagram of the open state of the bending die according to Embodiment 3 of the present utility model;

[0029] Figure 8 Schematic diagram of the structure of the second guiding post according to Embodiment 3 of the present utility model;

[0030] 1. Upper die unit; 11. Upper die base; 12. Upper backing plate; 13. Upper clamping plate; 14. Stopper plate; 15. Upper stripper plate;

[0031] 2. Lower die unit; 21. Lower die base; 22. Lower backing plate; 23. Lower template;

[0032] 3. Bending punch; 31. First drainage channel; 32. Installation groove; 33. Through hole; 34. Step structure;

[0033] 4. Bending groove;

[0034] 5. First oil pipe;

[0035] 6. Needle roller;

[0036] 7. First oil inlet nozzle;

[0037] 8. First guide post; 81. Oil guide groove; 82. Second drainage channel;

[0038] 9. First guide sleeve;

[0039] 10. Second oil pipe;

[0040] 11. Second oil inlet nozzle;

[0041] 12. Second guide post;

[0042] 13. Second guide sleeve;

[0043] 14. Third oil inlet nozzle;

[0044] 15. Third oil pipe;

[0045] 16. Ball. Detailed implementation manners

[0046] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0047] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0048] Example 1:

[0049] Please refer to Figures 1 - 3 , a bending die applied to metal sheets, including an upper die unit 1 and a lower die unit 2. The upper die unit 1 is located above the lower die unit 2. The upper die unit 1 is used to connect an external driving force, and the lower die unit 2 is used to carry a product. In the state where the upper die unit 1 and the lower die unit 2 are closed, the bending operation of the product is realized.

[0050] Inside the upper die unit 1, a bending punch 3 is installed. The lower end of the bending punch 3 protrudes from the lower end of the upper die unit 1. At the position corresponding to the bending punch 3 on the upper end of the lower die unit 2, a bending groove 4 is formed for the bending punch 3 to extend into.

[0051] Place the product on the lower die unit 2, and make the position of the product to be bent located at the edge of the bending groove 4. As the upper die unit 1 moves downward, it drives the bending punch 3 to bend downward, and bends the position of the product to be bent downward along the edge of the bending groove 4.

[0052] Specifically, the upper die unit 1 includes an upper die base 11, an upper backing plate 12, an upper clamping plate 13, a stop plate 14, and an upper stripper plate 15 that are connected in sequence from top to bottom. The upper die base 11 plays a role of support and fixation. The upper backing plate 12 is used to support the upper clamping plate 13. The stop plate 14 is used to support the upper stripper plate 15. The upper stripper plate 15 plays a role of blank holding before stamping and unloading after stamping. The bending punch 3 passes through the upper clamping plate 13, the stop plate 14, and the upper stripper plate 15, and its lower end protrudes from the upper stripper plate 15; the lower die unit 2 includes a lower die base 21, a lower backing plate 22, and a lower template 23 that are connected in sequence from bottom to top. The lower die base 21 plays a role of support and fixation. The lower backing plate 22 is used to support the lower template 23. The lower template 23 plays a role of blank holding before stamping and unloading after stamping. The bending groove 4 is formed on the lower template 23.

[0053] A first oil pipe 5 is connected to the upper end of the bending punch 3. A needle roller 6 is rotatably installed at the lower end of the bending punch 3. The needle roller 6 is used for rolling contact with the product. A first drainage channel 31 is formed inside the bending punch 3. The first drainage channel 31 is used to drain the lubricating oil of the first oil pipe 5 to the needle roller 6.

[0054] The first drainage channel 31 is formed inside the bending punch 3, which is used to drain the lubricating oil output by the first oil pipe 5 to the needle roller 6, so that the outer surface of the needle roller 6 is attached with lubricating oil, which plays a role in cooling the needle roller 6 and preventing deformation. In addition, forming the first drainage channel 31 inside the bending punch 3 can accurately drain the lubricating oil to the position of the needle roller 6, and avoid the outflow or splashing of the lubricating oil caused by directly adding lubricating oil to the needle roller 6 from the outside.

[0055] It can be known that the first oil pipe 5 is located at the upper end of the bending punch 3, while the needle roller 6 is located at the lower end of the bending punch 3. Therefore, the first drainage channel 31 is used to drain the lubricating oil at the upper end to the position of the needle roller 6 at the lower end. The first drainage channel 31 can be a channel extending in the vertical direction. With the help of the gravity of the lubricating oil itself, it flows from top to bottom to the position of the needle roller 6.

[0056] By rotatably installing the needle roller 6 at the lower end of the bending punch 3, during the downward bending process of the bending punch 3, the surface of the product is in rolling contact with the needle roller 6, driving the position to be bent of the product to bend downward. The needle roller 6 can be made of tungsten steel, which has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. Applied in this embodiment, it can ensure the bending effect of the needle roller 6 on the product and ensure the service life of the needle roller 6, reducing disassembly and replacement.

[0057] See Figure 1 and Figure 2 , in some embodiments, a first oil inlet nozzle 7 is provided between the upper end of the bending punch 3 and the first oil pipe 5. The first oil inlet nozzle 7 communicates with the first oil pipe 5 and the first drainage channel 31. Through the first oil inlet nozzle 7, the amount of lubricating oil entering the first drainage channel 31 from the first oil pipe 5 can be better controlled, avoiding adding too much lubricating oil.

[0058] See Figure 3 , in some embodiments, a horizontally extending installation groove 32 is formed at the lower end of the bending punch 3. The needle roller 6 is rotatably installed in the installation groove 32. Using the horizontally extending installation groove 32 to rotatably install the needle roller 6 can ensure the rolling contact between the needle roller 6 and the product surface during the bending process from top to bottom; through holes 33 for communicating with the first drainage channel 31 are provided on the groove wall of the installation groove 32. When the needle roller 6 rolls relative to the installation groove 32, lubricating oil is attached to the outer surface of the needle roller 6 through the through holes 33, playing a role in cooling the needle roller 6 and preventing deformation.

[0059] It should be noted that the size, quantity, and position distribution of the through holes 33 can be adjusted according to actual needs, and this embodiment does not limit this.

[0060] In some embodiments, a stepped structure 34 is formed at the lower end of the bending punch 3 relative to the end of the needle roller 6. The stepped structure 34 is used to limit the depth of the bending punch 3 extending into the bending groove 4, preventing damage to the product caused by over-punching.

[0061] For example, the lower end of the bending punch 3 includes an opposite first end and a second end. The needle roller 6 is rotatably installed at the first end of the lower end of the bending punch 3, while the stepped structure 34 is formed at the second end of the lower end of the bending punch 3. During the bending operation, the first end of the lower end of the bending punch 3 extends into the bending groove 4. When it extends to a certain depth, the second end of the lower end of the bending punch 3 abuts against the edge of the bending groove 4 to play a role in restricting the further downward movement of the bending punch 3.

[0062] Embodiment 2:

[0063] The difference between this embodiment and Embodiment 1 is that in this embodiment, further structural optimization has been carried out on the bending die of the present utility model. Please refer to Figures 4 - 6 .

[0064] In this embodiment, a first guide post 8 is further installed inside the upper die unit 1. The lower end of the first guide post 8 protrudes from the lower end of the upper die unit 1. A first guide sleeve 9 for the first guide post 8 to extend into is embedded and installed on the lower die unit 2. Through the cooperation of the first guide post 8 and the first guide sleeve 9, the alignment accuracy of the upper die unit 1 and the lower die unit 2 is ensured, so as to ensure the accuracy of the bending operation.

[0065] Furthermore, the upper end of the first guide post 8 is connected with a second oil pipe 10. A plurality of oil guide grooves 81 extending circumferentially are formed on the outer surface of the lower end of the first guide post 8. A second drainage channel 82 is formed inside the first guide post 8. The second drainage channel 82 is used to drain the lubricating oil of the second oil pipe 10 to the plurality of oil guide grooves 81. The lubricating oil plays a role in cooling the first guide post 8, so as to improve the service life.

[0066] For example, three oil guide grooves 81 extending circumferentially are formed on the outer surface of the lower end of the first guide post 8. The oil guide grooves 81 are spaced apart from top to bottom. The second drainage channel 82 includes a vertical channel part and a horizontal channel part. The upper end of the vertical channel part is connected to the second oil pipe 10, and the lower end of the vertical channel part is connected to the horizontal channel part. The horizontal channel part runs through the first guide post 8 in the horizontal direction, so that the lubricating oil overflows to the outer surface of the first guide post 8 after flowing through the vertical channel part to the horizontal channel part, and then flows into each oil guide groove 81, so that when the first guide post 8 slides and contacts inside the first guide sleeve 9, the lubricating oil can play a lubricating role and a cooling role.

[0067] Furthermore, a second oil inlet nozzle 11 is arranged between the upper end of the first guide post 8 and the second oil pipe 10. The second oil inlet nozzle 11 connects the second oil pipe 10 and the second drainage channel 82. The setting of the second oil inlet nozzle 11 can better control the amount of oil flowing through the oil guide grooves 81 and avoid adding too much lubricating oil.

[0068] In this embodiment, the first guide post 8 can be set as the inner guide post of the bending die. By forming the second drainage channel 82 inside the first guide post 8, it can play a role in accurately adding lubricating oil to the first guide post 8, and avoid the outflow or splashing of the lubricating oil caused by directly adding lubricating oil from the outside to the first guide post 8.

[0069] Embodiment 3:

[0070] The difference between this embodiment and Embodiment 1 is that in this embodiment, further structural optimization has been carried out on the bending die of the present utility model. Please refer to Figure 7 and Figure 8。

[0071] In this embodiment, a second guide post 12 is further installed inside the upper die unit 1. The lower end of the second guide post 12 protrudes from the lower end of the upper die unit 1. A second guide sleeve 13 for the second guide post 12 to extend into is embedded and installed on the lower die unit 2. Through the cooperation relationship between the second guide post 12 and the second guide sleeve 13, the alignment accuracy of the upper die unit 1 and the lower die unit 2 is ensured, so as to ensure the accuracy of the bending operation.

[0072] Furthermore, a third oil inlet nozzle 14 is provided at the upper part of the outer periphery of the second guide sleeve 13. The third oil inlet nozzle 14 is connected with a third oil pipe 15; the third oil inlet nozzle 14 communicates with the inside of the second guide sleeve 13. Lubricating oil is introduced into the inside of the second guide sleeve 13 through the third oil inlet nozzle 14. When the second guide post 12 slides and contacts inside the second guide sleeve 13, the lubricating oil can play a role in cooling the second guide post 12, so as to improve the service life.

[0073] A plurality of balls 16 are installed on the lower end of the second guide post 12 to roll along the circumferential direction. The way of rolling contact of the balls 16 is beneficial to reducing pressure and making the lubricating oil play a better cooling role.

[0074] For example, at the same horizontal height, six balls 16 are installed on the lower end of the second guide post 12 to roll along the circumferential direction, and in the vertical direction corresponding to each ball 16, five balls 16 are provided. Through this arrangement method, a relatively uniform rolling lubrication effect can be achieved, so as to achieve a better cooling effect.

[0075] A bending die for metal sheets according to the present utility model installs needle rollers at the lower end of the bending punch. The needle rollers are in rolling contact with the product, which is beneficial to reducing pressure. A first drainage channel is provided inside the bending punch to drain the lubricating oil of the first oil pipe to the needle rollers. The lubricating oil adheres to the needle rollers to form a protective film, which plays a role in cooling the needle rollers and preventing deformation, and improves the service life of the needle rollers.

[0076] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0077] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0078] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0079] In the present utility model, unless otherwise clearly specified and defined, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being above, over and on top of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being below, under and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0080] Although the description of the present utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included within the spirit and scope of the appended claims.

Claims

1. A bending die for metal sheets, characterized in that: It comprises an upper mold unit (1) and a lower mold unit (2), wherein the upper mold unit (1) is located above the lower mold unit (2); A bending punch (3) is installed inside the upper die unit (1), the lower end of the bending punch (3) is exposed at the lower end of the upper die unit (1), and a bending groove (4) for the bending punch (3) to extend into is formed at the upper end of the lower die unit (2) corresponding to the position of the bending punch (3); The upper end of the bending punch (3) is connected to a first oil pipe (5), and the lower end of the bending punch (3) is rollingly mounted with a needle roller (6), and the needle roller (6) is used for rolling contact with the product. A first drainage channel (31) is formed inside the bending punch (3), and the first drainage channel (31) is used to drain the lubricating oil of the first oil pipe (5) to the needle roller (6).

2. The bending die for metal sheet according to claim 1, characterized in that: A first oil inlet nozzle (7) is provided between the upper end of the bending punch (3) and the first oil pipe (5), and the first oil inlet nozzle (7) is connected to the first oil pipe (5) and the first drainage channel (31).

3. The bending die for metal sheet according to claim 1, characterized in that: A horizontally extending mounting groove (32) is formed at the lower end of the bending punch (3), and the needle roller (6) is rollingly mounted in the mounting groove (32); A through hole (33) for communicating with the first drainage channel (31) is formed on the groove wall of the installation groove (32).

4. The bending die for metal sheets according to claim 1, characterized in that: A step structure (34) is formed at the lower end of the bending punch (3) relative to the end of the rolling needle (6), and the step structure (34) is used to limit the depth of the bending punch (3) extending into the bending groove (4).

5. The bending die for metal sheet according to claim 1, characterized in that: A first guide column (8) is also installed inside the upper mold unit (1), the lower end of the first guide column (8) is exposed at the lower end of the upper mold unit (1), and a first guide sleeve (9) for the first guide column (8) to extend into is embedded and installed on the lower mold unit (2).

6. The bending die for metal sheet according to claim 5, characterized in that: The upper end of the first guide column (8) is connected to a second oil pipe (10), a plurality of oil guide grooves (81) extending in a circumferential direction are formed on the outer surface of the lower end of the first guide column (8), a second drainage channel (82) is formed inside the first guide column (8), and the second drainage channel (82) is used to drain the lubricating oil of the second oil pipe (10) to the plurality of oil guide grooves (81).

7. The bending die for metal sheet according to claim 6, characterized in that: A second oil inlet nozzle (11) is provided between the upper end of the first guide column (8) and the second oil pipe (10), and the second oil inlet nozzle (11) is connected to the second oil pipe (10) and the second drainage channel (82).

8. The bending die for metal sheets according to claim 1, characterized in that: A second guide column (12) is also installed inside the upper mold unit (1), the lower end of the second guide column (12) is exposed at the lower end of the upper mold unit (1), and a second guide sleeve (13) for the second guide column (12) to extend into is embedded and installed on the lower mold unit (2).

9. The bending die for metal sheet according to claim 8, characterized in that: A third oil inlet nozzle (14) is provided on the upper portion of the outer circumference of the second guide sleeve (13), and the third oil inlet nozzle (14) is connected to a third oil pipe (15); The third oil inlet nozzle (14) is connected to the interior of the second guide sleeve (13).

10. The bending die for metal sheet according to claim 8, characterized in that: A plurality of balls (16) are rollingly mounted on the lower end of the second guide column (12) along the circumferential direction.

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