Foundation cover die and stamping equipment comprising same

Abstract

The utility model relates to the technical field of easy-open lid production, and discloses a base lid die and stamping equipment comprising the base lid die. A foundation cover die comprises an upper die, a lower die and a lower die, the upper side face of the lower die is sunken to form a pressing groove matched with the pressing strip in shape. The pressing strip and the pressing groove are used for pressing a force rib structure on the foundation cover, and an included angle alt is formed between the inner side wall of the pressing groove and the bottom surface of the pressing groove; and 90 degrees. The method has the beneficial effects that the use adaptability of the tinplate with the hardness improved in the field of the easy-to-pull lids is improved, and the quality of the easy-to-pull lids is improved.

Description

Technical Field

[0001] This utility model relates to the field of easy-open lid production technology, and in particular to a basic lid mold and a stamping equipment including the basic lid mold. Background Technology

[0002] Currently, the material used to manufacture aluminum cans is generally tinplate, also known as tin-plated steel sheet, which refers to cold-rolled thin steel sheets with a thin layer of metallic tin plated on the surface. The tin layer is non-toxic and odorless, and has a bright surface, mainly serving to prevent corrosion and rust.

[0003] The production of easy-open lids involves multiple processes. First, the base lid is shaped, rolled, and glued. Then, riveting, engraving, and pull ring assembly are performed. During the base lid shaping process, the pressing action of the base lid mold creates a rib structure. With technological advancements, the hardness of tinplate has been further improved, enhancing the hardness and quality of easy-open lids. However, this increased hardness also reduces its tensile properties. If the original base lid mold is used for production, the tinplate cannot be fully deformed, and the resulting rib structure will not meet requirements. Utility Model Content

[0004] The main purpose of this utility model is to propose a base cover mold, which aims to solve the technical problem that it is difficult to produce base covers of the correct specifications using tinplate with increased hardness in the existing base cover mold.

[0005] To achieve the above objectives, this utility model proposes a base cover mold, comprising: an upper mold, wherein a pressure strip is protruding from the lower side of the upper mold; and a lower mold, wherein a pressure groove matching the shape of the pressure strip is recessed from the upper side of the lower mold; the pressure strip and the pressure groove are used to press a force-exporting rib structure on the base cover, wherein the included angle α between the inner sidewall of the pressure groove and the bottom surface of the pressure groove is less than 90°.

[0006] The beneficial effects of this invention are as follows: Because the hardness of tinplate is increased, its tensile strength is correspondingly reduced. If the increased hardness tinplate is to be pressed and deformed, the deformation range must be greater than that of existing molds to process the tinplate to the appropriate size. In the basic cover mold of this invention, the included angle α between the inner wall of the pressing groove and the bottom surface of the pressing groove is less than 90°. Using this basic cover mold to process the increased hardness tinplate into a basic cover allows for sufficient deformation of the tinplate, producing a compliant rib structure. This improves the adaptability of the increased hardness tinplate for use in the easy-open cover field and enhances the quality of easy-open covers.

[0007] Preferably, the included angle α between the inner sidewall of the groove and the bottom surface of the groove is ≥80°, which is beneficial for making the tinplate with increased hardness into a base cover with a compliant rib structure, and the tinplate will not crack or be damaged, which is beneficial for improving the quality of the base cover and the easy-open cover.

[0008] Preferably, the pressure strip extends around the axis of the upper mold and is connected end to end to form a pressure ring, and the pressure groove extends around the axis of the lower mold and is connected end to end to form an annular groove, which helps to improve the overall strength of the base cover, thereby improving the quality of the easy-open cover.

[0009] Preferably, the lower mold includes a lower mold core and a lower mold ring. The lower mold ring is located on the outside of the lower mold core. An annular notch is formed on the upper outer edge of the lower mold core. The inner wall of the lower mold ring and the annular notch enclose an annular groove, which facilitates matching the corresponding lower mold core and lower mold ring according to the different sizes of the reinforcing rib structure, thereby improving production efficiency.

[0010] Preferably, the upper side of the lower mold ring is provided with a first annular arc surface structure connecting the inner and outer sides of the lower mold ring. The first annular arc surface structure includes a first annular arc surface, a second annular arc surface, and a third annular arc surface connected sequentially along the inner to outer direction of the lower mold ring. The second annular arc surface faces upward, which helps to reduce the possibility of tinplate cracking and damage, and plays a role in protecting the material and improving the quality of the easy-open cover.

[0011] Preferably, the radius R1 of the first annular arc surface is 2.05mm~2.25mm, the radius R2 of the second annular arc surface is 5.9mm~6.1mm, and the radius R3 of the third annular arc surface is 1.1mm~1.3mm.

[0012] Preferably, the lower side of the pressure strip is provided with a second annular arc surface structure connecting the inner and outer sides of the pressure strip. The second annular arc surface structure includes a fourth annular arc surface and a fifth annular arc surface connected sequentially along the inner to outer direction of the pressure strip. This helps to reduce the possibility of tinplate cracking and damage, and plays a role in protecting the material and improving the quality of the easy-open cover.

[0013] Preferably, the radius R4 of the fourth annular arc surface is 0.65mm~0.85mm, and the radius R5 of the fifth annular arc surface is 0.4mm~0.6mm.

[0014] Preferably, the base cover mold also includes an upper cutter body, and the lower inner side of the upper cutter body is provided with a sixth annular arc surface, the radius R6 of the sixth annular arc surface being 1.15mm~1.35mm.

[0015] This utility model also provides a stamping device, including the above-mentioned base cover mold. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the base cover mold in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the upper mold in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the lower mold in an embodiment of the present invention;

[0020] Figure 4 This is a front view of the base cover mold in an embodiment of this utility model;

[0021] Figure 5 for Figure 4 AA cross-section view;

[0022] Figure 6 for Figure 5 A magnified view of part B in the middle section;

[0023] Figure 7 This is a front view of the lower mold core and lower mold ring in an embodiment of this utility model;

[0024] Figure 8 for Figure 7 CC cross-section;

[0025] Figure 9 for Figure 8 A magnified view of part D in the middle;

[0026] Figure 10 This is a schematic diagram of the lower mold core in an embodiment of the present invention;

[0027] Figure 11 This is a front view of the upper mold core in an embodiment of this utility model;

[0028] Figure 12 for Figure 11 EE cross-section;

[0029] Figure 13 for Figure 12 A magnified view of part F in the middle;

[0030] Figure 14 This is a schematic diagram of the stamping equipment in an embodiment of the present invention.

[0031] In the attached diagram: 1-Upper mold, 11-Upper mold core, 111-Pressure strip, 1111-Pressure ring, 1112-Fourth annular arc surface, 1113-Fifth annular arc surface, 12-Pressure ring, 13-Upper cutter body, 131-Sixth annular arc surface, 2-Lower mold, 21-Lower mold core, 211-Annular notch, 22-Lower mold ring, 221-First annular arc surface, 222-Second annular arc surface, 223-Third annular arc surface, 23-Extraction ring, 24-Lower cutter body, 25-Pressure groove, 251-Annular groove.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] like Figures 1 to 13 As shown, a base cover mold includes: an upper mold 1, on the lower side of which a pressure strip 111 is protruding; and a lower mold 2, on the upper side of which a pressure groove 25 matching the shape of the pressure strip 111 is recessed; the pressure strip 111 and the pressure groove 25 are used to press a force-exporting rib structure on the base cover, and the included angle α between the inner sidewall of the pressure groove 25 and the bottom surface of the pressure groove 25 is less than 90°.

[0037] Because the hardness of tinplate is increased, its tensile strength is correspondingly reduced. To deform tinplate with increased hardness, the deformation range needs to be greater than that of existing molds to process it to the appropriate size. In the basic cover mold of this invention, the included angle α between the inner wall of the pressing groove 25 and the bottom surface of the pressing groove 25 is less than 90°. Using this basic cover mold to process the tinplate with increased hardness into a basic cover allows for sufficient deformation of the tinplate, producing a compliant rib structure. This improves the adaptability of the hardened tinplate for use in the easy-open cover field and enhances the quality of easy-open covers.

[0038] In existing technology, the angle between the side wall of the rib structure on the easy-open lid and the lid body is generally not less than 90°. However, since the tinplate used previously had relatively low hardness and high tensile strength, to process the rib structure to achieve a 90° angle between its side wall and the lid body, the angle α between the inner side wall of the pressure groove 25 and the bottom surface of the pressure groove 25 needs to be 90°. If α is less than 90°, it may compromise the hardness of the base lid, thus affecting the quality of the easy-open lid.

[0039] The base cover mold in this embodiment is designed for processing tinplate with increased hardness. After being pressed using the base cover mold, the bent portion of the tinplate will spring back slightly. For example, if the angle α between the inner wall of the groove 25 and the bottom surface of the groove 25 is 90°, then the angle between the side wall of the rib structure and the cover body of the base cover formed using this mold will ultimately be greater than 90°. Therefore, to accommodate the increased hardness of the tinplate material, in this embodiment, the angle α between the inner wall of the groove 25 and the bottom surface is set to less than 90° to produce a base cover with high hardness and a rib structure that meets the requirements.

[0040] In some specific embodiments, reference is made to Figures 7 to 9 The included angle α between the inner wall of the pressure groove 25 and the bottom surface of the pressure groove 25 is ≥80°.

[0041] The bending difficulty of tinplate varies depending on its thickness. Therefore, in actual production, the angle 'a' between the inner wall of the pressure groove 25 and the bottom surface must be adjusted according to the thickness of the tinplate. Generally, the thicker the tinplate, the smaller 'a' should be. However, 'a' cannot be less than 80°, otherwise the possibility of tinplate breakage will increase significantly. Therefore, setting 'a' ≥ 80° is beneficial for protecting the tinplate material and ensuring the quality of the base cover and easy-open cover. In general, controlling 'a' within the range of 80° ≤ a < 90° is beneficial for manufacturing base covers with compliant rib structures from tinplate with increased hardness, without causing the tinplate to break or be damaged, thus improving the quality of the base cover and easy-open cover.

[0042] In some specific embodiments, reference is made to Figure 2 and Figure 6 The pressure strip 111 extends around the axis of the upper mold 1 and is connected end to end to form a pressure ring 1111, and the pressure groove 25 extends around the axis of the lower mold 2 and is connected end to end to form an annular groove 251.

[0043] The pressure strip 111 is connected end to end to form a pressure ring 1111, and the pressure groove 25 is connected end to end to form an annular groove 251. This can press an annular rib structure on the base cover, which is beneficial to improve the overall strength of the base cover and thus improve the quality of the easy-open cover.

[0044] In some specific embodiments, reference is made to Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 10 The lower mold 2 includes a lower mold core 21 and a lower mold ring 22. The lower mold ring 22 is located on the outside of the lower mold core 21. An annular notch 211 is formed on the upper outer edge of the lower mold core 21. The inner sidewall of the lower mold ring 22 and the annular notch 211 enclose each other to form an annular groove 251.

[0045] The height between the inner and outer walls of the annular groove 251 on the lower die 2 is generally different, and the height difference between the inner and outer walls of the annular groove 251 needs to be adjusted according to the different rib structures. The annular groove 251 is formed by combining the lower die core 21 and the lower die ring 22, which makes it easy to match the corresponding lower die core 21 and lower die ring 22 according to the different dimensions of the rib structure, which helps to improve production efficiency.

[0046] In some specific embodiments, reference is made to Figure 9 The upper side of the lower mold ring 22 is provided with a first annular arc surface structure connecting the inner side and the outer side of the lower mold ring 22. The first annular arc surface structure includes a first annular arc surface 221, a second annular arc surface 222 and a third annular arc surface 223 connected in sequence along the direction from the inner side to the outer side of the lower mold ring 22, wherein the second annular arc surface 222 faces upward.

[0047] Specifically, the lower mold 2 includes a lower mold core 21, a lower mold ring 22, an ejector ring 23, and a lower cutter body 24 arranged sequentially from the inside to the outside. The upper mold 1 includes an upper mold core 11, a pressure ring 12, and an upper cutter body 13 arranged sequentially from the inside to the outside. During pressing, the pressure ring 1111 on the upper mold core 11 corresponds to the annular groove 251 on the lower mold core 21, the pressure ring 12 on the upper mold core 11 corresponds to the lower mold ring 22 on the lower mold core 21, and the upper cutter body 13 on the upper mold core 11 corresponds to the ejector ring 23 on the lower mold core 21. In addition to cutting out the outer contour of the base cover, the upper cutter body 13 also needs to press down the tinplate around the outer edge of the lower mold ring 22. In this way, the tinplate on both the inner and outer sides of the lower die ring 22 needs to be pressed down. Therefore, the first annular arc surface structure is set on the upper side of the lower die ring 22, which helps to disperse the pressure from the die on the tinplate lifted by the lower die ring 22, which helps to reduce the possibility of tinplate cracking and damage, and plays a role in protecting the material and improving the quality of easy-open lid.

[0048] In some specific embodiments, reference is made to Figure 9 The radius R1 of the first annular arc surface 221 is 2.05mm~2.25mm, the radius R2 of the second annular arc surface 222 is 5.9mm~6.1mm, and the radius R3 of the third annular arc surface 223 is 1.1mm~1.3mm.

[0049] After multiple tests, it was found that when the radius R1 of the first annular arc surface 221, the radius R2 of the second annular arc surface 222, and the radius R3 of the third annular arc surface 223 are within the above range, the tinplate material at the corresponding position is less likely to break when bent, and it is also less likely to damage the tin layer on the surface of the tinplate, which helps to ensure the quality of the base cover and the easy-open cover.

[0050] In some specific embodiments, reference is made to Figure 13 The lower side of the pressure strip 111 is provided with a second annular arc surface structure connecting the inner side and the outer side of the pressure strip 111. The second annular arc surface structure includes a fourth annular arc surface 1112 and a fifth annular arc surface 1113 connected sequentially along the inner side to the outer side of the pressure strip 111.

[0051] Whether the connection between the inner and outer surfaces of the pressure strip 111 is smooth also affects the ease with which the tinplate will break during the pressing process. A second annular arc-shaped structure is provided on the lower side of the pressure strip 111 to connect the inner and outer surfaces, ensuring a smooth connection between them. This allows the pressure from the mold on the tinplate at the corresponding position to be more dispersed, reducing the possibility of tinplate breakage and damage, thus protecting the material and improving the quality of the easy-open lid.

[0052] In some specific embodiments, reference is made to Figure 13The radius R4 of the fourth annular arc surface 1112 is 0.65mm~0.85mm, and the radius R5 of the fifth annular arc surface 1113 is 0.4mm~0.6mm.

[0053] After multiple tests, it was found that when the radius R4 of the fourth annular arc surface 1112 and the radius R5 of the fifth annular arc surface 1113 are within the above range, the tinplate material at the corresponding position is less likely to break when bent, and it is also less likely to damage the tin layer on the surface of the tinplate, which helps to ensure the quality of the base cover and the easy-open cover.

[0054] In some specific embodiments, reference is made to Figure 6 The base cover mold also includes an upper cutter body 13, and the lower inner side of the upper cutter body 13 is provided with a sixth annular arc surface 131, the radius R6 of the sixth annular arc surface 131 is 1.15mm~1.35mm.

[0055] Specifically, the upper cutter body 13 includes a cutting edge located on the outer side of the lower end, a bottom surface located at the lower end, a sixth annular arc surface 131 located on the inner side of the lower end, and an inner surface. The bottom surface and the inner surface are perpendicular to each other, and the sixth annular arc surface 131 connects the bottom surface and the inner surface of the upper cutter body 13, making the bottom surface and the inner surface of the upper cutter body 13 smoothly connected. When pressing the base cover, in addition to using the cutting edge located on the outer side of the lower end to cut out the outer contour of the base cover, the upper cutter body 13 also needs to press down the tinplate around the lower mold ring 22. The sixth annular arc surface 131 presses on the tinplate, so that the corresponding position of the base cover can be smoothly connected, making it less likely for the tinplate to break due to bending at this point of the base cover, which is beneficial to improving the quality of the base cover and the easy-open cover.

[0056] Regarding the radius R6 of the sixth annular arc surface 131, in the prior art, this data is generally around 1.5mm. In this embodiment, since it is aimed at tinplate material with increased hardness and reduced tensile strength, experiments have shown that adjusting this data to 1.15mm~1.35mm makes the tinplate less prone to breakage and is more conducive to ensuring the quality of the easy-open lid.

[0057] In some specific embodiments, reference is made to Figure 6 and Figure 9 The width L1 of the pressure strip 111 is 1.48mm~1.68mm, and the width L2 of the narrowest part of the pressure groove 25 is 1.88mm~2.08mm.

[0058] The thickness of the base cover and easy-open cover is generally 0.2mm. Based on conventional requirements, the width data of the pressure strip 111 and pressure groove 25 are obtained.

[0059] This embodiment also provides a stamping device, see reference. Figure 14 This includes the aforementioned basic cover mold.

[0060] Specifically, the stamping equipment is equipped with multiple base cover dies arranged in sequence to produce multiple base covers simultaneously, thereby improving production efficiency.

[0061] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A base cover mold characterized by: The utility model relates to a base cover mould which comprises: an upper die (1) having a protruding pressing strip (111) on the lower side; a lower die (2) having a recessed pressing groove (25) on the upper side, which is matched with the pressing strip (111); the pressing strip (111) and the pressing groove (25) are used to press a rib structure on the base cover, and the included angle a between the inner side wall of the pressing groove (25) and the bottom surface of the pressing groove (25) is less than 90°.

2. The foundation cover mold of claim 1, wherein: The included angle a between the inner side wall of the pressing groove (25) and the bottom surface of the pressing groove (25) is greater than or equal to 80°.

3. The foundation cover mold of claim 1, wherein: The pressing strip (111) extends around the axis of the upper die (1) and connects the beginning and the end to form a pressing ring (1111), and the pressing groove (25) extends around the axis of the lower die (2) and connects the beginning and the end to form an annular groove (251).

4. The foundation cover mold of claim 3, wherein: The lower die (2) comprises a lower die core (21) and a lower die ring (22), the lower die ring (22) is arranged outside the lower die core (21), the upper side outer edge of the lower die core (21) is formed with an annular notch (211), and the inner side wall of the lower die ring (22) and the annular notch (211) form the annular groove (251).

5. The foundation cover mold of claim 4, wherein: The upper side of the lower die ring (22) is provided with a first annular curved surface structure connecting the inner side and the outer side of the lower die ring (22), the first annular curved surface structure comprises a first annular curved surface (221), a second annular curved surface (222) and a third annular curved surface (223) connected in sequence from the inner side to the outer side of the lower die ring (22), and the second annular curved surface (222) faces upwards.

6. The foundation cover mold of claim 5, wherein: The radius R1 of the first annular curved surface (221) is 2.05mm-2.25mm, the radius R2 of the second annular curved surface (222) is 5.9mm-6.1mm, and the radius R3 of the third annular curved surface (223) is 1.1mm-1.3mm.

7. The foundation cover mold of claim 1, wherein: The lower side of the pressing strip (111) is provided with a second annular curved surface structure connecting the inner side and the outer side of the pressing strip (111), and the second annular curved surface structure comprises a fourth annular curved surface (1112) and a fifth annular curved surface (1113) connected in sequence from the inner side to the outer side of the pressing strip (111).

8. The foundation cover mold of claim 7, wherein: The radius R4 of the fourth annular curved surface (1112) is 0.65mm-0.85mm, and the radius R5 of the fifth annular curved surface (1113) is 0.4mm-0.6mm.

9. The foundation cover mold of claim 1, wherein: The lower end of the upper cutter body (13) is provided with a sixth annular curved surface (131) on the inner side, and the radius R6 of the sixth annular curved surface (131) is 1.15mm-1.35mm.

10. A stamping apparatus characterized by: The utility model relates to a base cover mould which comprises: an upper die (1) having a protruding pressing strip (111) on the lower side; a lower die (2) having a recessed pressing groove (25) on the upper side, which is matched with the pressing strip (111); the pressing strip (111) and the pressing groove (25) are used to press a rib structure on the base cover, and the included angle a between the inner side wall of the pressing groove (25) and the bottom surface of the pressing groove (25) is less than 90°. The included angle a between the inner side wall of the pressing groove (25) and the bottom surface of the pressing groove (25) is greater than or equal to 80°. The pressing strip (111) extends around the axis of the upper die (1) and connects the beginning and the end to form a pressing ring (1111), and the pressing groove (25) extends around the axis of the lower die (2) and connects the beginning and the end to form an annular groove (251). The lower die (2) comprises a lower die core (21) and a lower die ring (22), the lower die ring (22) is arranged outside the lower die core (21), the upper side outer edge of the lower die core (21) is formed with an annular notch (211), and the inner side wall of the lower die ring (22) and the annular notch (211) form the annular groove (251). The upper side of the lower die ring (22) is provided with a first annular curved surface structure connecting the inner side and the outer side of the lower die ring (22), the first annular curved surface structure comprises a first annular curved surface (221), a second annular curved surface (222) and a third annular curved surface (223) connected in sequence from the inner side to the outer side of the lower die ring (22), and the second annular curved surface (222) faces upwards. The radius R1 of the first annular curved surface (221) is 2.05mm-2.25mm, the radius R2 of the second annular curved surface (222) is 5.9mm-6.1mm, and the radius R3 of the third annular curved surface (223) is 1.1mm-1.3mm. The lower side of the pressing strip (111) is provided with a second annular curved surface structure connecting the inner side and the outer side of the pressing strip (111), and the second annular curved surface structure comprises a fourth annular curved surface (1112) and a fifth annular curved surface (1113) connected in sequence from the inner side to the outer side of the pressing strip (111). The radius R4 of the fourth annular curved surface (1112) is 0.65mm-0.85mm, and the radius R5 of the fifth annular curved surface (1113) is 0.4mm-0.6mm. The lower end of the upper cutter body (13) is provided with a sixth annular curved surface (131) on the inner side, and the radius R6 of the sixth annular curved surface (131) is 1.15mm-1.35mm. The utility model relates to a base cover mould which comprises:

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