Sheet metal die for sheet metal parts

Abstract

The utility model discloses a sheet metal die for sheet metal parts, which comprises a punch and / or a female die, one of the punch and the female die is provided with an arc structure, the arc structure is provided with a plurality of arc sections, and the radiuses of at least two arc sections are different. According to the utility model, a single R-angle stiff material feeding structure of an original mold is changed into a multi-section R-angle material guiding structure, so that materials can obtain softer and more uniform pressure distribution when passing through the corners, and the situation of overhigh local stress can be reduced. Meanwhile, due to the fact that the whole flowing process becomes smoother, the possibility that cracks or other forms of damage are generated in the material is greatly reduced, zinc wires and zinc powder are not generated when a product is subjected to punch forming, and the product quality and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a sheet metal die for a sheet metal part. Background Art

[0002] In the sheet metal processing industry, sheet metal molds have a series of significant quality problems in long-term production practice, especially defects such as zinc wire, dezincification powder and zinc wire imprinting. These problems have become key factors restricting product quality and production efficiency.

[0003] Specifically, during the sheet metal mold production process, the punches and dies of sheet metal molds generally utilize a single R-angle transition path. This results in the galvanized sheet being subjected to tremendous blanking and forming forces during stamping. This mechanical condition can easily cause micro-damage to the sheet metal surface, leading to the powdering of the zinc coating and the shedding of zinc wire. The generation of zinc wire is particularly noticeable during the 45° bending process, due to the significant degree of bending deformation of the sheet metal. Failure to promptly remove these zinc wires and zinc dust can not only severely affect the product's appearance but also pose a potential threat to its performance.

[0004] For sheet metal parts that come into direct contact with electronic components, the presence of zinc wire and zinc dust poses a significant safety hazard. During vibration or movement, zinc wire and zinc dust can fall off the surface of the sheet metal, causing serious problems such as short circuits in electrical components or controller failure, directly threatening product reliability and safety.

[0005] To address this issue, current production workshops generally shut down the machine every hour to use an air gun to clean the zinc wire and zinc dust from the mold cavity. However, this practice not only increases production costs and results in significant labor waste, but also hinders long-term, stable control of product quality. While mold polishing and other treatments can mitigate the generation of zinc wire and zinc dust to some extent, these methods do not fundamentally address the problem, and the generation of zinc wire and zinc dust still occurs. Utility Model Content

[0006] The utility model aims to provide a sheet metal mold for a sheet metal part, aiming to solve the problem that the existing sheet metal molds cannot fundamentally solve the problems of the generation of zinc wire and zinc powder.

[0007] An embodiment of the present utility model provides a sheet metal mold for a sheet metal part, comprising: a punch and / or a die, wherein one of the punch and the die is provided with an arc structure, and the arc structure is provided with multiple arc segments, and the radii of at least two of the arc segments are different.

[0008] Furthermore, the punch is a flanging punch, the arc structure is arranged on the flanging punch, and the arc structure includes a first flanging arc segment, a second flanging arc segment and a third flanging arc segment connected in sequence.

[0009] Furthermore, the radius of the first flanging arc segment is in the range of 3.00±0.5 mm, the radius of the second flanging arc segment is in the range of 10.00±0.5 mm, and the radius of the third flanging arc segment is in the range of 3.00±0.5 mm.

[0010] Furthermore, a flanging guide section is provided on the flanging punch, one end of the first flanging arc section is connected to the flanging guide section, and the other end of the first flanging arc section is connected to the second flanging arc section.

[0011] Furthermore, the punch is a 45° curved punch, the arc structure is arranged on the 45° curved punch, and the arc structure includes a first curved arc segment, a second curved arc segment and a third curved arc segment connected in sequence.

[0012] Furthermore, the radius of the first curved arc segment is in the range of 3.00±0.5 mm, the radius of the second curved arc segment is in the range of 50.00±0.5 mm, and the radius of the third curved arc segment is in the range of 5.00±0.5 mm.

[0013] Furthermore, a feed guide section is provided on the 45° curved punch, one end of the third curved arc section is connected to the feed guide section, and the other end of the third curved arc section is connected to the second curved arc section.

[0014] Furthermore, the die is a bending die, the arc structure is arranged on the bending die, and the arc structure includes a first bending arc segment, a second bending arc segment and a third bending arc segment connected in sequence.

[0015] Furthermore, the radius of the first bending arc segment is in the range of 3.00±0.5 mm, the radius of the second bending arc segment is in the range of 10.00±0.5 mm, and the radius of the third bending arc segment is in the range of 3.00±0.5 mm.

[0016] Furthermore, the material moving surface on the punch or the die is fully mirror polished.

[0017] The utility model discloses a sheet metal mold for sheet metal parts, including: a punch and a die, one of the punch and the die is provided with an arc structure, the arc structure is provided with a plurality of arc segments, and the radii of at least two of the arc segments are different. The utility model changes the original mold's single R-angle rigid material feeding structure into a multi-segment R-angle material guiding structure, so that the material can obtain a softer and more uniform pressure distribution when passing through the corners, which helps to reduce the occurrence of local excessive stress. At the same time, since the entire flow process becomes smoother, the possibility of cracks or other forms of damage inside the material is greatly reduced, so that zinc wire and zinc powder will not be generated during the stamping of the product, and the quality and production efficiency of the product can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram of a sheet metal mold for a sheet metal part;

[0020] Figure 2 Schematic diagram of the structure of the flanging punch and the pressing block of this embodiment;

[0021] Figure 3 Schematic diagram of the structure of the flanging punch of this embodiment;

[0022] Figure 4 for Figure 3 Partial diagram of A in the middle;

[0023] Figure 5 Schematic diagram of the structure of a specific embodiment and a conventional flanging punch;

[0024] Figure 6 This is a schematic structural diagram of the 45° curved punch and the press block of this embodiment;

[0025] Figure 7 This is a schematic structural diagram of a 45° curved punch according to the present embodiment;

[0026] Figure 8 for Figure 7 Partial view of B in the middle;

[0027] Figure 9 Schematic diagram of the structure of a specific embodiment and a conventional 45° bent punch;

[0028] Figure 10 Schematic diagram of the structure of the punch and bending die of this embodiment;

[0029] Figure 11 Schematic diagram of the structure of a specific embodiment and a conventional punch and bending die;

[0030] Description of the marks in the figure:

[0031] 1. Punch; 2. Die; 3. Arc structure; 4. Arc segment; 5. First flanging arc segment; 6. Second flanging arc segment; 7. Third flanging arc segment; 8. Flanging guide segment; 9. First curved arc segment; 10. Second curved arc segment; 11. Third curved arc segment; 12. Feed guide segment; 13. Chamfering segment; 14. 45° forming segment; 15. First bending arc segment; 16. Second bending arc segment; 17. Third bending arc segment; 18. Bending guide segment. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0034] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0035] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] See also Figure 1 and Figure 2 This embodiment provides a sheet metal mold, including: a punch 1 and / or a die 2, one of the punch 1 and the die 2 is provided with an arc structure 3, and the arc structure 3 is provided with multiple arc segments 4, and the radii of at least two arc segments 4 are different.

[0037] This embodiment replaces the original mold's rigid, single-angle R-shaped material routing structure with a multi-stage R-angle guiding structure. This allows for a softer and more even pressure distribution at corners, helping to reduce localized excessive stress. Furthermore, since the entire flow process becomes smoother, the likelihood of internal cracks or other forms of damage in the material is greatly reduced, thus preventing zinc streaks and dust from forming during product stamping, and improving product quality and production efficiency.

[0038] In some embodiments, see Figure 2-4 The punch 1 is a flanging punch, and the arc structure 3 is arranged on the flanging punch. The arc structure 3 includes a first flanging arc segment 5, a second flanging arc segment 6 and a third flanging arc segment 7 connected in sequence.

[0039] As the metal material passes through the flanging punch, it undergoes a series of arc segments with different curvature radii4:

[0040] First flanging arc segment 5: This stage is mainly responsible for guiding the material into the bending process to start the deformation process smoothly and reduce stress concentration in the initial stage.

[0041] Second flanging arc segment 6: This is the middle stage of the bending process. This segment is designed to maintain the consistency of material flow and avoid cracks or zinc peeling due to sudden changes in the material.

[0042] The third flanging arc segment 7: This segment is used to complete the final bending angle. By precisely controlling the shape of this segment, the material can be ensured to achieve the desired bending degree while minimizing surface damage.

[0043] The optimized arc structure 3 effectively disperses stress during the bending process, reducing flaking and powdering of the zinc layer. The multi-segment arc design helps maintain the integrity of the material surface, reducing unnecessary indentations and scratches, and improving the appearance of the finished product. By reducing the intense friction between the material and the mold, it also helps protect the mold itself and extend its service life. It also reduces the frequency of downtime for cleaning, improves production efficiency, and reduces the additional costs associated with frequent downtime.

[0044] Furthermore, the radius of the first flange arc segment 5 is in the range of 3.00±0.5mm, the radius of the second flange arc segment 6 is in the range of 10.00±0.5mm, and the radius of the third flange arc segment 7 is in the range of 3.00±0.5mm. Figure 5In part (a), the radius of the first flanging arc segment 5 is in the range of 3.00 mm, the radius of the second flanging arc segment 6 is in the range of 10.00 mm, and the radius of the third flanging arc segment 7 is in the range of 3.00 mm.

[0045] The radius of the first flanging arc segment 5 is in the range of 3.00±0.5mm. Such a design helps to smoothly guide the flow of the material at the beginning of the bending process, reduce stress concentration in the initial stage, and prevent early damage to the zinc layer. The radius of the second flanging arc segment 6 is in the range of 10.00±0.5mm. The larger radius of the second arc provides a smoother transition, allowing the material to deform evenly over a wider area, further dispersing stress and avoiding overload in local areas. The radius of the third flanging arc segment 7 is also in the range of 3.00±0.5mm. The small radius design similar to the first segment allows the material to be precisely controlled when the bending is about to be completed, ensuring that the final flanging angle meets the requirements while minimizing surface damage.

[0046] In some embodiments, a flanging guide section 8 is provided on the flanging punch, one end of the first flanging arc section 5 is connected to the flanging guide section 8 , and the other end of the first flanging arc section 5 is connected to the second flanging arc section 6 .

[0047] The design of the flanging guide section 8 allows for precise guidance and positioning of the material before it enters the flanging arc section 4. This helps reduce material deviation and distortion during the flanging process, ensuring the accuracy and stability of the flanging operation. Furthermore, the flanging guide section 8 optimizes the material flow path, ensuring smoother material flow during the flanging process. This helps reduce resistance and friction during the flanging process, minimizing material loss and wear on the punch 1.

[0048] Furthermore, the angle formed by the flanged guide section 8 with the horizontal direction is in the range of 10° to 20°, and the width of the flanged guide section 8 is 1 to 2 mm greater than the width of the arc structure 3. For example, in one specific embodiment, the angle formed by the flanged guide section 8 with the horizontal direction is in the range of 15°, the width of the flanged guide section 8 is 3 mm, and the width of the arc structure 3 is 2 mm. The width of the flanged guide section 8 is 1 mm greater than the width of the arc structure 3.

[0049] Furthermore, to ensure smoother and more gradual movement of the material during punching, thereby reducing localized stress concentration, the material forming distance needs to be increased. In one embodiment, the original punch height was 25 mm, while the punch height of this embodiment is 28 mm. This 3 mm height increase increases the material forming distance by 0-3 mm, thereby reducing localized stress concentration and improving product quality and production efficiency.

[0050] In some embodiments, see Figure 6-8 The punch 1 is a 45° curved punch, and the arc structure 3 is arranged on the 45° curved punch. The arc structure 3 includes a first curved arc segment 9, a second curved arc segment 10 and a third curved arc segment 11 connected in sequence.

[0051] When the metal material passes through the 45° curved punch, it will experience a series of arc segments with different curvature radii 4:

[0052] The first curved arc segment 9 is the starting part of the bending process and has an appropriate radius for guiding the material to smoothly enter the bending process and reduce stress concentration in the initial stage.

[0053] The second curved arc segment 10 provides a smoother transition area, allowing the material to deform evenly over a larger range, thereby helping to further disperse stress.

[0054] The third curved arc segment 11: at the end of the bending process, ensures that the material can accurately reach the required 45° bending angle while minimizing surface damage.

[0055] The optimized multi-segment arc design reduces localized stress concentration during bending, significantly reducing zinc peeling and the generation of zinc wire. The optimized four-segment arc design reduces surface indentations and other defects, improving the finished product's appearance. It also reduces the generation of zinc wire and zinc dust, reducing the frequency of mold cleaning and improving overall production efficiency. Furthermore, the more optimized material flow path reduces mold wear and extends mold life. For sheet metal parts that come into direct contact with electronic components, reducing the generation of zinc wire and zinc dust effectively prevents short circuits in these components and improves product electrical safety.

[0056] Furthermore, the radius of the first curved arc segment 9 is in the range of 3.00±0.5mm, the radius of the second curved arc segment 10 is in the range of 50.00±0.5mm, and the radius of the third curved arc segment 11 is in the range of 5.00±0.5mm. Figure 9 In part (a), the radius of the first curved arc segment 9 is in the range of 3.00 mm, the radius of the second curved arc segment 10 is in the range of 50.00 mm, and the radius of the third curved arc segment 11 is in the range of 5.00 mm.

[0057] The three-segment curved arc structure 3, with its specific radius range, is designed to provide a smoother and more controlled deformation process during a 45° bend. By precisely controlling the radius of each arc segment 4, the material flow path is optimized, stress concentration is reduced, and damage to the galvanized layer, such as the generation of zinc streaks, zinc dust, and zinc streaking, is avoided. This design is particularly suitable for processing galvanized materials requiring high surface quality and electrical safety.

[0058] In some embodiments, a feed guide section 12 is provided on the 45° curved punch, one end of the third curved arc section 11 is connected to the feed guide section 12 , and the other end of the third curved arc section 11 is connected to the second curved arc section 10 .

[0059] The design of the feed guide section 12 enables the material to be accurately guided along a specific path to the processing area of ​​the 45° curved punch. This helps to ensure the position accuracy of the material during the punching process and reduce deviation and waste.

[0060] Furthermore, the length of the feed guide section 12 is in the range of 1-2.00 mm.

[0061] Compared with the feed guide section 12 of a conventional 45° curved punch, the present embodiment shortens the length of the feed guide section 12, thereby reducing the feed guide distance and reducing the friction between the material and the 45° curved punch.

[0062] For example, in one embodiment, see Figure 9 The length of the feed guide section 12 is 1.205 mm, which is 1.833 mm shorter than the 3.038 mm long feed guide section 12 on the conventional 45° curved punch, thereby reducing the friction between the material and the 45° curved punch.

[0063] In some embodiments, the 45° curved punch is further provided with a chamfering section 13 and a 45° forming section 14 , one end of the chamfering section 13 is connected to the feed guide section 12 , and the other end of the chamfering section 13 is connected to the 45° forming section 14 .

[0064] The design of the chamfered section 13 reduces wear on the punch 1 during the stamping process. When the material is stamped, the chamfered section 13 first contacts the material. Due to its well-designed angle, it disperses the impact force during stamping, reducing wear on the punch 1 itself and thus extending the service life of the punch 1. Furthermore, the design of the chamfered section 13 reduces resistance during the stamping process, making the stamping process smoother. This helps reduce energy consumption and production costs, and improves stamping efficiency.

[0065] Furthermore, the chamfered section 13 has a value range of 3.0±0.5 mm. In a specific embodiment, the chamfered section 13 has a value range of 3.0 mm.

[0066] It should be noted that when the punch is a flanging punch or a 45° bent punch, the material is fixed by the pressing block Y.

[0067] In some embodiments, see Figure 10 and Figure 11 The die 2 is a bending die, and the arc structure 3 is arranged on the bending die. The arc structure 3 includes a first bending arc segment 15, a second bending arc segment 16 and a third bending arc segment 17 connected in sequence.

[0068] The optimized multi-segment arc design reduces the local stress concentration of the plate during the bending process, thereby significantly reducing the peeling of the zinc layer and the generation of zinc wire.

[0069] Furthermore, the radius of the first curved arc segment 15 is in a range of 3.00±0.5mm, the radius of the second curved arc segment 16 is in a range of 10.00±0.5mm, and the radius of the third curved arc segment 17 is in a range of 3.00±0.5mm. In a specific embodiment, the radius of the first curved arc segment 15 is in a range of 3.00mm, the radius of the second curved arc segment 16 is in a range of 10.00mm, and the radius of the third curved arc segment 17 is in a range of 3.00mm.

[0070] The three-segment bending arc structure 3 within the aforementioned radius range is designed to provide a smoother and more controllable deformation process during material bending. By precisely controlling the radius of each arc segment 4, the material flow path is optimized, stress concentration is reduced, and thus damage to the galvanized layer, such as the generation of zinc wire, zinc dust, and zinc wire imprinting, is avoided.

[0071] Furthermore, a bending guide section 18 is provided on the bending die, and the transverse length of the bending guide section 18 is greater than the transverse length of the arc structure 3 by 2.0 mm to 3.0 mm.

[0072] In some embodiments, the material moving surface on the punch 1 or the die 2 is fully mirror polished.

[0073] The full mirror polishing process makes the material move more smoothly during the forming movement, reduces the friction between the material and the punch 1 or reduces the friction between the material and the die 2, and further avoids damage to the galvanized layer, such as the generation of zinc wire, zinc powder and zinc wire imprinting.

[0074] The material moving surface is the contact surface between the material and the punch 1 during the stamping process, or the material moving surface is the contact surface between the material and the die 2 during the stamping process. In other words, the material moving surface includes the arc structure 3 and the connection surface connected to the arc structure 3.

[0075] It should be noted that Figure 5 and Figure 9 Part (a) is the punch structure design of this embodiment, while part (b) is the conventional punch structure design. Figure 11 Part (a) is a conventional punch structure design, while part (b) is the punch structure design of this embodiment.

[0076] In some embodiments, the mold structure is adjusted to provide a blanking gap (i.e., Figure 1 c) Adjustment and optimization, specifically, changing from the standard punching gap (as shown in Table 1) to the latest gap (as shown in Table 2).

[0077] Table 1

[0078]

[0079]

[0080] Table 2

[0081]

[0082] As can be seen from the above, compared with the standard punching gap, this embodiment ensures a smooth punched cross-section by reducing the punching gap in the previous process punching die.

[0083] Among them, T and Figure 1 The t in the table represents the thickness of the material. The β in the table represents the pressure.

[0084] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0085] It should also be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive.

[0086] Inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A sheet metal mold, characterized in that: include: The punch and / or the die, one of the punch and the die is provided with an arc structure, the arc structure is provided with a plurality of arc segments, and the radii of at least two of the arc segments are different.

2. The sheet metal mold according to claim 1, characterized in that: The punch is a flanging punch, the arc structure is provided on the flanging punch, and the arc structure comprises a first flanging arc segment, a second flanging arc segment and a third flanging arc segment which are connected in sequence.

3. The sheet metal mold according to claim 2, characterized in that: The radius of the first flanging arc segment is in the range of 3.00±0.5 mm, the radius of the second flanging arc segment is in the range of 10.00±0.5 mm, and the radius of the third flanging arc segment is in the range of 3.00±0.5 mm.

4. The sheet metal mold according to claim 2, characterized in that: The flanging punch is provided with a flanging guide section, one end of the first flanging arc section is connected to the flanging guide section, and the other end of the first flanging arc section is connected to the second flanging arc section.

5. The sheet metal mold according to claim 1, characterized in that: The punch is a 45° curved punch, the arc structure is provided on the 45° curved punch, and the arc structure comprises a first curved arc segment, a second curved arc segment and a third curved arc segment which are connected in sequence.

6. The sheet metal mold according to claim 5, characterized in that: The radius of the first curved arc segment is in the range of 3.00±0.5 mm, the radius of the second curved arc segment is in the range of 50.00±0.5 mm, and the radius of the third curved arc segment is in the range of 5.00±0.5 mm.

7. The sheet metal mold according to claim 5, characterized in that: The 45° curved punch is provided with a feed guide section, one end of the third curved arc section is connected to the feed guide section, and the other end of the third curved arc section is connected to the second curved arc section.

8. The sheet metal mold according to claim 1, characterized in that: The die is a bending die, the arc structure is arranged on the bending die, and the arc structure includes a first bending arc segment, a second bending arc segment and a third bending arc segment connected in sequence.

9. The sheet metal mold according to claim 8, characterized in that: The radius of the first bending arc segment is in the range of 3.00±0.5 mm, the radius of the second bending arc segment is in the range of 10.00±0.5 mm, and the radius of the third bending arc segment is in the range of 3.00±0.5 mm.

10. The sheet metal mold according to claim 1, characterized in that: The material moving surface on the punch or the die is fully mirror polished.

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