An easy-open lid riveting structure and its processing method

Abstract

The present invention provides a riveting structure for an easy-open lid, including a lid body and a pull ring. A rivet is convexly provided on the lid body, and the pull ring is riveted and connected to the rivet. Wherein, in the riveted state, the top diameter of the rivet is a, and a = 3.70 - 3.85 mm, the side wall thickness of the rivet is b, and b = 0.20 - 0.30 mm, and the riveting depth of the pull ring is c, and c = 0.20 - 0.25 mm. And a processing method for the riveting structure of the easy-open lid. The present invention can facilitate the control of the forming quality of the riveting structure of the easy-open lid, avoid leakage of the easy-open lid and direct detachment of the pull ring, thereby improving the user experience and the economic benefits of the enterprise.

Description

Technical Field

[0001] The invention belongs to the technical field of easy-open covers, and in particular relates to a rivet riveting structure of an easy-open cover and a processing method thereof. Background Art

[0002] In the process of rivet forming, since the amount of metal stretched to form the entire rivet is limited, the quality control of the rivet of the easy-open end mainly lies in the control of the rivet diameter and rivet thickness; however, in actual production, the diameter and thickness of the rivet cannot always be taken into account:

[0003] When the rivet diameter is too large and the rivet thickness is too small, the compressive strength of the product will be reduced, and there will often be quality problems such as side wall leakage caused by uneven thickness;

[0004] When the rivet diameter is too small and the rivet thickness is too large, the pull ring is easily pulled off due to insufficient riveting strength, which seriously affects the user experience and brand reputation.

[0005] In addition, the testing of the riveting strength of the rivets on the easy-open lid is usually judged by the multiple of the reverse pulling force and the opening force; but in fact, even if the multiple meets the requirements, the above quality problems will still exist.

[0006] In order to solve the above problems, the prior art mostly increases the overall thickness of the easy-open lid to increase the amount of metal for rivet stretching, so that the diameter and thickness of the rivet can be taken into account; but in fact, increasing the overall thickness of the easy-open lid directly increases the production cost and reduces the economic benefits of the enterprise. Summary of the invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an easy-open cover rivet riveting structure and a processing method thereof, so as to facilitate the forming quality control of the easy-open cover rivet riveting structure and improve the economic benefits of the enterprise.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A rivet riveting structure for an easy-open cover comprises a cover body and a pull ring, wherein a rivet is protruding from the cover body, and the pull ring is riveted and connected to the rivet; wherein, in the riveted state,

[0010] The top diameter of the rivet is a, and a=3.70-3.85 mm.

[0011] The side wall thickness of the rivet is b, and b=0.20-0.30 mm.

[0012] The riveting depth of the pull ring is c, and c=0.20-0.25 mm.

[0013] Preferably, the protruding height of the rivet is d, where d = 0.95 - 0.975 mm.

[0014] Preferably, the top thickness of the rivet is e, where e > 0.10 mm.

[0015] Preferably, a notch structure is provided on the side surface of the cover body facing the pull ring, and the notch structure is arranged close to the rivet;

[0016] The side surface of the cover body opposite to the notch structure is horizontally arranged.

[0017] A processing method for a riveting structure of an easy-open lid rivet includes the following steps:

[0018] S1. Place the blank of the easy-open lid in the forming cavity of the mold, and form a protruding structure on the cover body of the easy-open lid. The protruding structure includes a first protrusion and a second protrusion arranged in sequence from top to bottom, and the diameter width of the second protrusion is greater than that of the first protrusion;

[0019] S2. On the basis of step S1, perform a second forming on the protruding structure to form a rivet. At this time, the rivet is in an unriveted state;

[0020] S3. On the basis of step S2, stamp a hardening area on the cover body around the rivet;

[0021] S4. Align the mounting hole of the pull ring with the rivet and sleeved on the rivet, and perform riveting stamping; wherein, after the cover body and the pull ring are riveted and connected,

[0022] The top diameter of the rivet is a, where a = 3.70 - 3.85 mm,

[0023] The side wall thickness of the rivet is b, where b = 0.20 - 0.30 mm,

[0024] The riveting depth of the pull ring is c, where c = 0.20 - 0.25 mm.

[0025] Further, in step S1, the connections between the first protrusion and the second protrusion, and between the second protrusion and the cover body are all smooth transition connections;

[0026] The thickness b of the first protrusion 1 > 0.2 mm, the thickness b of the second protrusion 2 > 0.17 mm, the protruding height d of the first protrusion 1 = 2.05 - 2.25 mm.

[0027] Further, the height d of the rivet 2 is 1.56 - 1.68 mm, and the thickness f of the hardening zone is 0.18 - 0.21 mm.

[0028] Further, before the pull ring is riveted to the lid body, a scoring structure is provided on the upper end face of the lid body, and the scoring structure is disposed close to the rivet; and the end face of the lid body opposite to the scoring structure is horizontally arranged.

[0029] Further, in step S4, the mold includes a lower ejector pin and an upper ejector pin;

[0030] A boss for supporting the lid body is provided on the lower ejector pin, and along the stamping direction of the mold, the scoring structure falls within the range of the boss;

[0031] The upper ejector pin includes an inner ejector pin and an outer ejector pin coaxially sleeved. The outer ejector pin presses the pull ring and the lid body tightly on the boss, and along the stamping direction of the mold, the scoring structure falls within the range of the outer ejector pin; the inner ejector pin is used for riveting and connecting the pull ring and the lid body.

[0032] Further, in the riveted state,

[0033] the protruding height of the rivet is d, where d = 0.95 - 0.975 mm;

[0034] the top thickness of the rivet is e, where e > 0.10 mm.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] In this solution, the parameters in the process of riveting the rivet of the easy - open lid are optimized and controlled, so that for the riveting structure of the easy - open lid, the process and tooling equipment in the rivet forming process can be optimized and improved to improve the production rate of the easy - open lid products; at the same time, by controlling the dimensional parameters, a control standard value can be set for each main parameter in the riveting structure. When inspecting the easy - open lid product, only need to cut the easy - open lid in half and obtain the corresponding parameters for comparison. Through the analysis and judgment of the numerical values, the strength and sealing reliability of the rivet riveting can be directly obtained, effectively avoiding the problem that there are still defective products in the traditional technology even when meeting the multiple requirements, further facilitating the control of the product and improving the yield of the easy - open lid products.

[0037] Meanwhile, in this solution, the metal amounts at each main parameter during the rivet forming and riveting processes are optimized and controlled, making the rivet riveting structure in this solution more reliable on the premise of the same blank thickness; thus effectively avoiding the problem of increased production costs caused by increasing the thickness of the easy-open lid blank in the traditional technology to improve the yield rate; effectively improving the economic benefits of the easy-open lid product and facilitating its popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a schematic diagram of the forming in step S1 of the present invention.

[0040] Figure 2 It is a schematic diagram of the structure of the easy-open lid after step S1 of the present invention.

[0041] Figure 3 It is a schematic diagram of the forming in step S2 of the present invention.

[0042] Figure 4 It is a schematic diagram of the structure of the easy-open lid after step S2 of the present invention.

[0043] Figure 5 It is a schematic diagram of the forming in step S3 of the present invention.

[0044] Figure 6 It is a schematic diagram of the structure of the easy-open lid after step S3 of the present invention.

[0045] Figure 7 It is a schematic diagram of the forming in step S4 of the present invention.

[0046] Figure 8 For Figure 7 a detailed structural schematic diagram of the D position in

[0047] Figure 9 It is a schematic diagram of the structure of the easy-open lid after step S4 of the present invention.

[0048] Figure 10 It is a schematic diagram of the structure of the pull ring in the present invention.

[0049] Wherein:

[0050] 1 - lid body, 11 - rivet, 12 - scoring structure, 13 - convex structure, 131 - first convex, 132 - second convex, 14 - concave structure, 15 - hardened area;

[0051] 2 - Pull ring, 21 - Mounting hole, 22 - Finger hole;

[0052] 3 - Mold, 31 - Lower ejector pin, 311 - Boss, 32 - Upper ejector pin, 321 - Inner ejector pin, 322 - Outer ejector pin, 33 - Positioning ejector pin. Specific implementation manner

[0053] In order to more clearly understand the above - mentioned objects, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the implementation manners of the present application and the features in the implementation manners can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The described implementation manners are only a part of the implementation manners of the present invention, rather than all of the implementation manners. All other implementation manners obtained by those of ordinary skill in the art based on the implementation manners of the present invention without creative efforts fall within the scope of protection of the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific implementation manners and are not intended to limit the present invention.

[0055] Embodiment 1

[0056] As Figure 9 、 Figure 10 shown, in this embodiment, an easy - open lid riveting structure is provided, which mainly includes a lid body 1 and a pull ring 2. A rivet 11 is convexly provided on the lid body 1, and the pull ring 2 is arranged on the rivet 11 in a riveted connection manner.

[0057] Further, in the riveted state, there are: the top diameter of the rivet 11 is a, a = 3.70 - 3.85 mm, the side - wall thickness of the rivet 11 is b, b = 0.20 - 0.30 mm, the riveting depth of the pull ring 2 is c, c = 0.20 - 0.25 mm.

[0058] The protruding height of the rivet 11 is d, d = 0.95 - 0.975 mm.

[0059] The top thickness of the rivet 11 is e, e > 0.10 mm.

[0060] As a preferred solution, a scoring structure 12 is provided on the side of the lid body 1 facing the pull ring 2, and the scoring structure 12 is arranged close to the rivet 11; on the side of the lid body 1 opposite to the scoring structure 12, the positions corresponding to the scoring structure 12 are all horizontally arranged.

[0061] For the convenience of understanding this solution, a processing method for the riveting structure of an easy-open lid rivet is provided in this embodiment. As shown in Figure 1-10 the following, it mainly includes the following steps:

[0062] S1. Place the blank of the easy-open lid in the forming cavity of the mold 3. Here, the mold 3 mentioned herein is a stamping mold. A convex structure 13 is formed on the lid body 1 of the easy-open lid through the stamping mold, as shown in Figure 1 、 Figure 2 .

[0063] Furthermore, the convex structure 13 includes a first convex 131 and a second convex 132 arranged in sequence from top to bottom. The diameter width of the second convex 132 is greater than that of the first convex 131; both between the first convex 131 and the second convex 132 and between the second convex 132 and the lid body 1 are smoothly transitionally connected.

[0064] As a preferred solution, the thickness b of the first convex 131 1 > 0.2 mm, the thickness b of the second convex 132 2 > 0.17 mm, and the convex height d of the first convex 131 1 = 2.05 - 2.25 mm.

[0065] S2. On the basis of step S1, perform a second forming on the convex structure 13 to form a rivet 11, as shown in Figure 3 、 Figure 4 . At this time, the rivet 11 is in an unriveted state; as a preferred solution, the height d of the rivet 11 at this time 2 = 1.56 - 1.68 mm, and the top thickness e of the rivet 11 1 > 0.2 mm.

[0066] Furthermore, in this step, the stamping forming of the concave structure 14 on the easy-open lid can also be carried out simultaneously.

[0067] S3. On the basis of step S2, punch and form a hardening zone 15 around the rivet 11 on the lid body 1, as shown in Figure 5 、 Figure 6 . In this embodiment, the hardening zone 15 is arranged in a ring shape adjacent to the bottom of the rivet 11. At this time, the height and top thickness of the rivet 11 remain unchanged. As a preferred solution, the thickness of the hardening zone 15 is set to f = 0.18 - 0.21 mm.

[0068] S4. Align the mounting hole 21 of the pull ring 2 with the rivet 11 and sleeved on the rivet 11, and perform riveting stamping, as shown inFigure 7-9 As shown in the figure; after the lid body 1 and the pull ring 2 are riveted and connected, the above-mentioned rivet riveting structure is formed; and when the lid body 1 is symmetrically cut, the symmetrical deviation z of the riveting depth c and the side wall thickness b on both sides of the rivet 11 is ≤ ±0.01 mm.

[0069] Furthermore, before the pull ring 2 and the lid body 1 are riveted and stamped into shape, that is, a notch structure 12 is provided on the upper end surface of the lid body 1. As a preferred solution, the formation of the notch structure 12 is between step S3 and step S4.

[0070] Even further, in step S4, the die 3 includes a lower ejector pin 31, an upper ejector pin 32, and a positioning ejector pin 33 for the finger hole 22 on the pull ring 2.

[0071] A boss 311 for supporting the lid body 1 is provided on the lower ejector pin 31. Along the stamping direction of the die 3, the notch structure 12 falls within the range of the boss 311; the upper ejector pin 32 includes an inner ejector pin 321 and an outer ejector pin 322 sleeved coaxially. The outer ejector pin 322 presses the pull ring 2 and the lid body 1 tightly on the boss 311, and along the stamping direction of the die 3, the notch structure 12 falls within the range of the outer ejector pin 322; the inner ejector pin 321 is used to stamp the rivet 11 to achieve the riveting connection between the pull ring 2 and the lid body 1.

[0072] The cross-sectional shape of the positioning ejector pin 33 is the same as the shape of the finger hole 22 on the pull ring 2.

[0073] In addition, the contact ends of the pull ring 2 and the rivet 11 need to be deburred first.

[0074] In this embodiment, the specific structural forms of the blank of the easy-open lid and the die 3 can be referred to the prior art and will not be elaborated here.

[0075] As mentioned above, it is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A processing method for the riveting structure of an easy-open lid rivet, characterized in that, the riveting structure of the easy-open lid rivet includes a lid body and a pull ring. A rivet is convexly provided on the lid body, and the pull ring is riveted and connected to the rivet. Among them, in the riveted state, the top diameter of the rivet is a, where a = 3.70 - 3.85 mm, the side wall thickness of the rivet is b, where b = 0.20 - 0.30 mm, the riveting depth of the pull ring is c, where c = 0.20 - 0.25 mm; the processing method of the riveting structure of the rivet includes the following steps: S1. Place the blank of the easy-open lid in the forming cavity of the mold, and form a convex structure on the lid body of the easy-open lid. The convex structure includes a first convex and a second convex arranged sequentially from top to bottom. The diameter width of the second convex is greater than that of the first convex. Among them, the mold includes a positioning thimble for the finger hole on the pull ring, and the cross-sectional shape of the positioning thimble is the same as the shape of the finger hole on the pull ring; S2. On the basis of step S1, perform a second forming on the convex structure to form a rivet. At this time, the rivet is in an unriveted state, and at the same time, perform a stamping forming on the concave structure of the easy-open lid; wherein, the top thickness e of the rivet 1 > 0.2 mm; S3. On the basis of step S2, stamp a hardening area on the lid body around the rivet; S4. Before riveting the pull ring and the lid body, set a scoring structure on the side of the lid body facing the pull ring. Among them, the scoring structure is arranged close to the rivet, and the side of the lid body opposite to the scoring structure is horizontally arranged. Then align the mounting hole of the pull ring with the rivet and sleeved on the rivet for riveting stamping. Among them, after the lid body and the pull ring are riveted and connected, the above-mentioned riveting structure of the rivet is formed. And, symmetrically cut the lid body, and the symmetrical deviation z of the riveting depth c and the side wall thickness b on both sides of the rivet ≤ ±0.01 mm.

2. A processing method for the riveting structure of an easy-open lid rivet according to claim 1, characterized in that, the convex height of the rivet is d, where d = 0.95 - 0.975 mm.

3. A processing method for the riveting structure of an easy-open lid rivet according to claim 1, characterized in that, in step S1, the connection between the first convex and the second convex, and between the second convex and the lid body is a smooth transition connection; The thickness b of the first protrusion 1 > 0.2 mm, the thickness b of the second protrusion 2 > 0.17 mm, the protrusion height d of the first protrusion 1 = 2.05 - 2.25 mm.

4. A processing method for the riveting structure of an easy-open lid rivet according to claim 1 or 3, characterized in that, The height d of the rivet 2 = 1.56 - 1.68 mm, and the thickness f of the hardened zone = 0.18 - 0.21 mm.

5. A processing method for the riveting structure of an easy-open lid rivet according to claim 1, characterized in that, in step S4, the mold includes a lower thimble and an upper thimble; a convex platform for supporting the lid body is provided on the lower thimble, and along the stamping direction of the mold, the scoring structure falls within the range of the convex platform; the upper thimble includes an inner thimble and an outer thimble sleeved coaxially. The outer thimble presses the pull ring and the lid body tightly on the convex platform, and along the stamping direction of the mold, the scoring structure falls within the range of the outer thimble; the inner thimble is used for riveting and connecting the pull ring and the lid body.

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