Method for manufacturing all-metal can lid and all-metal can lid

Abstract

The application discloses a full-metal can cover manufacturing method and a full-metal can cover. The manufacturing method comprises the following steps: stamping a thin metal sheet into a flip cover blank, punching an installation hole on the flip cover sidewall of the flip cover blank, and arranging a pivot part between the installation hole and the lower edge of the flip cover sidewall; stamping the thin metal sheet into a ring-shaped base blank; cutting a connecting sheet downward on the sidewall of the base blank, turning and opening the connecting sheet outward to form a clamping area; covering the metal cover body on the metal base so that the pivot part extends into the clamping area, bending the connecting sheet into the installation hole, and forming a pivot cavity which at least semi-surrounds the pivot part, so that the pivot part rotates in the pivot cavity and limits the metal cover body from being separated from the metal base, and then the metal cover body is turned around the metal base to open and close the upper opening of the metal base with the pivot part as the rotating shaft. The application has the advantages of simple process, low cost, simple structure, good wear resistance, and good appearance and environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal packaging, in particular to a full metal can lid manufacturing method and a full metal can lid. BACKGROUND

[0002] At present, in the field of packaging, common packaging materials include glass, paper, plastic, metal and composite materials. Among the above materials, glass has poor impact resistance and is too heavy, so its use is limited and it is difficult to use for disposable packaging. Paper has poor sealing and corrosion resistance, and plastic is seriously polluting. Metal packaging has good sealing and corrosion resistance, but the cost of metal packaging is often high, and at present tinplate is often used as a common material for metal packaging.

[0003] Tinplate, also known as tin-coated thin steel sheet, is a cold-rolled low-carbon thin steel sheet or steel strip coated with commercial pure tin on both sides. Tin mainly plays a role in preventing corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and attractive appearance of tin in one material, with the characteristics of corrosion resistance, non-toxicity, high strength and good ductility. However, when using tinplate containers, plastic lids are often used as the lid of the tinplate container. This makes it difficult to print the same process on the lid and the body of the container, making the appearance of the container not very attractive, and the lid still causes pollution when the container is recycled.

[0004] Referring to Chinese patent CN202021250113, using a metal lid as the lid of the container, the lid and the container body are often completely separated, the lid is connected to the container body by threads, or is directly clamped on the container body. This connection method often brings inconvenience to users when in use.

[0005] Therefore, referring to Chinese patent CN 218432650U, a metal can lid is disclosed, which includes a metal top cover, a metal bottom ring and a rotating shaft. The metal top cover and the metal bottom ring are respectively curled to form a hollow reel around the rotating shaft, so that the metal top cover can be opened and closed relative to the metal bottom ring. However, although this can lid is a full metal can lid, the structure between the metal top cover and the metal bottom ring is complex, and must be connected by a rotating shaft.

[0006] Referring to Chinese patent CN 218752383U, a can lid is disclosed, which comprises a base, an upper cover and a pivot part, the upper cover and the base are metal parts, the pivot part is a plastic part and has two parts that can rotate relative to each other, the two parts of the plastic part are respectively clamped with the upper cover and the base, so that the upper cover can be opened and closed relative to the base. Although this structure is relatively simple, it still needs the participation of the plastic part. The plastic part is not only more fragile than the metal body, but also easy to break and damage, which affects the stability and protection ability of the whole lid. Moreover, the texture and color of the plastic connecting part are difficult to completely match the metal cover. If the integration is not clever enough, it will look conspicuous in vision, and will lower the overall beauty and delicacy of the product. In terms of environmental protection, the metal cover is a material that is easy to recycle. After adding the plastic connecting part, the recycling process of metal and plastic is completely different, and the difficulty of separation and recycling is increased. If not handled properly, it will cause more resource waste, which does not meet the current environmental protection trend. Therefore, the existing can lid has high processing precision requirements for the connecting part, high installation requirements, and requires the plastic connecting part and the metal cover to be tightly matched. Moreover, the batch production efficiency is low, the production cost is high, and the connecting part is easy to wear off, which is not beautiful.

[0007] Therefore, there is an urgent need for a full-metal can lid manufacturing method and a full-metal can lid that can solve the above problems. SUMMARY

[0008] The purpose of the present application is to provide a full-metal can lid manufacturing method and a full-metal can lid, which is simple in process, low in cost, simple in structure, good in wear resistance and beautiful in appearance and environmental protection.

[0009] In order to achieve the above-mentioned purpose, the present application provides a full-metal can lid manufacturing method, which comprises: manufacturing a metal cover body: stamping a thin metal sheet into a flip cover blank, the flip cover blank comprising an integrally connected cover top and side wall blank; cutting an installation hole in the middle of the side wall blank to process the side wall blank into a flip cover side wall, the installation hole and the lower edge of the flip cover side wall forming a pivot part; manufacturing a metal base: stamping a thin metal sheet into a ring-shaped base blank; cutting a connecting piece downward from the side wall of the base blank, the connecting piece being connected to the side wall of the base blank; turning the connecting piece outward to form a clamping area; assembling the metal cover body and the metal base: covering the metal cover body on the metal base and making the pivot part extend into the clamping area and be clamped between the turned-out connecting piece and the side wall of the base blank; wrapping the connecting piece around the pivot part and bending it into the installation hole to form a pivot cavity that at least semi-surrounds the pivot part, so that the pivot part is rotatably installed in the pivot cavity and limits the metal cover body from being separated from the metal base, and then the metal cover body is turned around the metal base with the pivot part as the rotation axis to open and close the upper opening of the metal base.

[0010] Preferably, the lower edge of the flip cover side wall is also crimped to form a first crimp when the metal cover is manufactured, so that the pivot portion has a crimp structure. This facilitates the relative rotation between the metal cover and the metal base.

[0011] Specifically, the lower edge of the mounting hole is adjacent to or extends to the first crimp, so that the pivot portion has a crimp shape.

[0012] Specifically, the first crimp has a circular cross-section, so that the pivot portion has a circular shape. The circular shape can be a regular circle or an irregular circle, such as an irregular arc shape. This facilitates the rotation between the metal cover and the metal base.

[0013] Preferably, the cutting position of the connecting piece is spaced from the upper edge of the metal base. This scheme makes the upper edge of the metal cover not have a notch, which is not easy to hurt the hand.

[0014] Preferably, the lower edge of the metal base is also crimped to form a second crimp when the metal base is manufactured, and the upper edge of the metal base is also crimped to form a third crimp.

[0015] Preferably, the punching of the thin metal sheet into a ring-shaped base blank specifically includes: punching the thin metal sheet into a circular base pre-blank; inwardly indenting the upper half of the side wall of the base pre-blank to form a top ring, and the unindented lower half forms a bottom ring, the diameter of the top ring is smaller than that of the bottom ring, and a cover abutting table is formed between the top ring and the bottom ring, and the base pre-blank is processed into a base blank. When the metal cover is covered on the metal base, the lower edge of the cover side wall of the metal cover abuts against the cover abutting table.

[0016] Specifically, the base pre-blank includes a first ring and a second ring having a table structure between the first ring, and the diameter of the second ring is greater than that of the first ring. When the upper half of the side wall of the base pre-blank is inwardly indented to form a top ring, the upper half of the side wall of the second ring is inwardly indented to form a top ring. When the all-metal can cover is assembled with the can body, the metal base is sleeved on the outside of the upper end of the can body, and the side wall of the can body not only covers the notch cut by the connecting piece, but also makes the upper end of the can body have an indentation, the top end of the indentation abuts against the connecting table, and the lower edge of the indentation abuts against the cover abutting table at the corner of the can body.

[0017] Specifically, when the metal cover is made, the lower edge of the flip cover side wall is also curled to form a first curling edge, which is an inner curling edge; when the metal base is made, a clamping hole and a through hole are also formed on the side wall of the metal base opposite to the connecting piece, the clamping hole is above the through hole, and the clamping hole is located at a position covered by the metal cover when the metal cover is closed, and the through hole is located at a position exposed when the metal cover is closed; a clamping switch assembly is provided, which includes a clamping body, a flexible arm bent and extended from the clamping body to the two sides, a spherical protrusion formed on the clamping body and capable of being matched to extend into the clamping hole, and a switch protrusion formed on the clamping body and capable of being matched to extend into the through hole, the ends of the two flexible arms are fixed to the inner side wall of the metal base by rivets, and the spherical protrusion extends out of the side wall of the metal base through the clamping hole, and the switch protrusion also extends out of the side wall of the metal base through the through hole, and pressing or releasing the switch protrusion can drive the spherical protrusion to extend inwardly into the clamping hole or extend outwardly out of the clamping hole under the action of elasticity; when the metal cover is closed on the metal base, the spherical protrusion is clamped on the first curling edge. This scheme makes the clamping between the metal cover and the metal base more compact, and facilitates the sealing of the metal cover on the opening of the metal base.

[0018] The application also provides a full-metal can cover made by the full-metal can cover manufacturing method. The full-metal can cover includes a metal base and a metal cover, the metal cover is rotationally connected to the metal base and can be flipped relative to the metal base to open or close the upper opening of the metal base, and the metal base can be sleeved on a can body; the metal cover includes an integrally connected cover top and cover side wall, a through mounting hole is formed in the cover side wall of the metal cover, and a pivot part is formed between the mounting hole and the bottom edge of the cover side wall; the side wall of the metal cover is cut downward and bent outward to form a metal connecting piece connected with the side wall of the metal cover, the metal connecting piece is matched with the position of the pivot part, and after being bent outward, the metal connecting piece is flipped inward through the mounting hole to form a pivot cavity at least semi-surrounding the pivot part, so that the pivot part is rotationally connected in the pivot cavity and limits the metal cover from being separated from the metal base, and then the metal cover is flipped around the metal base with the pivot part as the rotation axis to open or close the upper opening of the metal base.

[0019] Compared with the prior art, the metal cover body and the metal base are connected by rotating after the installation hole and the connecting piece are cut on the sidewall of the metal cover body and the metal base respectively, the connecting piece is turned inside and curled to wrap the pivot part formed after cutting the installation hole, the process is simple, the cost is low, the rotating shaft is directly formed on the sidewall of the metal cover body without separate production. On the other hand, the full metal can cover and the metal base are connected by rotating through the curved metal connecting piece and the pivot part, the wear resistance is good, the appearance is beautiful, the environment is protected, and the recycling is easy. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a manufacturing flow chart of the metal cover body of the present application.

[0021] Figure 2 is a manufacturing flow chart of the front half of the metal base of the present application.

[0022] Figure 3 is a manufacturing flow chart of the rear half of the metal base of the present application.

[0023] Figure 4 is a structure diagram when the metal cover body and the metal base of the present application are assembled.

[0024] Figure 5 is a sectional view of Figure 4 .

[0025] Figure 6 is an enlarged view of a portion a of Figure 5 .

[0026] Figure 7 is a structure diagram when the metal cover body and the metal base of the present application are assembled.

[0027] Figure 8 is a sectional view of Figure 7 . is an exploded view.

[0028] Figure 9 is a sectional view of Figure 7 .

[0029] Figure 10 is an enlarged view of a portion b of Figure 9 .

[0030] Figure 11 is an enlarged view of a portion c of Figure 9 .

[0031] Figure 12 is a structure diagram when the metal cover body of the present application is turned open relative to the metal base.

[0032] Figure 13 is an enlarged view of a portion d of Figure 12 .

[0033] Figure 14 is a perspective view of the metal base of the present application.

[0034] Figure 15 is an exploded view of the metal base and snap-on switch assembly of the present application. DETAILED DESCRIPTION

[0035] To make the technical content, structural features, achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0036] The present application provides a full metal can lid manufacturing method, comprising the steps of: Figures 1 to 3 manufacturing a metal lid body 10, manufacturing a metal base 20, referring to Figure 6 and Figure 10 assembling the metal lid body 10 and the metal base 20, so that the metal lid body 10 is rotationally connected to the metal base 20 and can be flipped relative to the metal base 20 to open or close the upper opening of the metal base 20, wherein the metal base 20 can be sleeved on a can body (the can body includes a can body and a bottom cover located at the bottom of the can body). The steps of manufacturing the metal lid body 10 and manufacturing the metal base 20 are performed independently and have no specific sequence.

[0037] Referring to Figure 1 , the manufacturing of the metal lid body 10 includes steps 11 and 12.

[0038] Step 11 includes: stamping a thin metal sheet to form a flip cover blank 10a (as shown in (d) of Figure 1 ), the flip cover blank including a lid top 11 and a sidewall blank 12a extending downward along the periphery of the lid top 11.

[0039] Specifically, step 11 includes: referring to (a) of Figure 1 , stamping the thin metal sheet to form a lid body blank 10a including a lid top 11 and a sidewall blank 12a, the end of the sidewall blank 12a being curved outward to form a surplus; referring to (b) of Figure 1 , cutting the surplus 12a on the sidewall blank 12a of the lid body blank; referring to (c) and (d) of Figure 1 , curling the end of the sidewall blank 12a to form a first curl 123 to make the flip cover blank 10a.

[0040] Wherein, the end of the sidewall blank 12a can be curled into the first curl 123 at one time, or the pre-curl 123a of (c) of Figure 1 can be performed first, and then the first curl 123 of (d) of Figure 1 can be curled.

[0041] Step 12, referring to (e) in Figure 1 Step 12, referring to (e) in

[0042] In this embodiment, the first edge 123 is formed before the installation hole 13 is punched, which can prevent the lower edge of the side wall blank 12a from being distorted when the installation hole 13 is punched, so that the shape of the lower edge of the side wall blank 12a is stable, and the metal cover 10 cannot be matched due to the punching of the installation hole 13.

[0043] Continuing to refer to (e) in Figure 1 Step 12, referring to (e) in

[0044] Referring to Figure 2 , the metal base is made up of steps 21, 22 and 23.

[0045] Step 21, a thin metal sheet is punched to form a ring-shaped base blank 20b.

[0046] Step 21, a thin metal sheet is punched to form a ring-shaped base blank 20b, which specifically includes: referring to (a) in Figure 2 Step 21, a thin metal sheet is punched to form a ring-shaped base blank 20b, which specifically includes: referring to (a) in

[0047] In this embodiment, the base pre-blank 20a is processed as follows: first, a cup-shaped blank is punched, which includes a disc bottom, a first circle of pre-punched side walls extending downward from the disc bottom, a pre-filling table extending outward from the lower end of the first circle of pre-punched side walls, and a second circle 202 extending downward from the end of the pre-filling table; the above-mentioned blank is subjected to secondary punching, so that the first circle of pre-punched side walls is retracted to a first circle 201 of a predetermined size, and the pre-filling table is expanded to a connecting table 26 of a predetermined size. Finally, the disc bottom of the blank is punched to open the disc bottom to form an opening of the first circle 201, thereby forming the annular base pre-blank 20a. Therefore, in this embodiment, the base pre-blank 20a also has a first circle 201 and a second circle 202, and the diameter of the first circle 201 is smaller than that of the second circle 202, so as to form a connecting table 26 between the first circle 201 and the second circle 202 for abutting against the inner side of the can body.

[0048] refer to Figure 2 In step (b), the upper half of the sidewall of the base preform 20a is recessed inward to form a top ring 21, and the unstretched lower half forms a bottom ring 22. The diameter of the top ring 21 is smaller than that of the bottom ring 22, and a cover abutment 24 is formed between the top ring 21 and the bottom ring 22, so that the base preform 20a is processed into a base blank 20b. Specifically, the upper half of the sidewall of the second ring 202 is recessed inward to form the top ring 21, so the cover abutment 24 is located on the sidewall of the second ring 202, dividing the second ring 202 into a third ring 203 and a bottom ring 22. The top ring 21 is composed of a first ring 201 and a third ring 203.

[0049] The bottom ring 22 also has an outwardly curved excess material 220 on its lower side. (Reference) Figure 2 In step (c), the excess material 220 on the lower side of the bottom ring 22 is also cut off.

[0050] Step 22, refer to Figure 3 In (f), a connecting piece 23b with its lower edge connected to the side wall of the base blank 20b is cut downward from the side wall of the base blank 20b.

[0051] Specifically, the connecting piece 23b is formed by punching the bottom ring 22 near the cover abutment 24 in the base blank 20b. This connecting piece 23b is a non-flipped connecting piece.

[0052] refer to Figure 3 In step (f), several engaging protrusions 25 are punched inward on the side wall of the third ring 203 in the base blank 20b to engage with the can body. The engaging protrusions 25 are inverted triangles, providing high stability in engagement with the can body and minimizing the risk of breaking through the side wall of the third ring 203 during punching. This step can be performed simultaneously with the cutting of the connecting piece 23b, or sequentially; the order can be reversed.

[0053] Step 23, refer to Figure 3 In (i), the connecting piece 23b is flipped outward to form a connecting piece 23a, and an engagement area 231a is formed between the connecting piece 23a and the side wall of the base blank.

[0054] In this embodiment, the connecting piece 23b can be pushed outward by a sliding insert on a mold that extends into the base blank, causing the connecting piece 23b to flip outward into the connecting piece 23a. Alternatively, the connecting piece 23b can be pushed outward and flipped from above to form the connecting piece 23a. Furthermore, the connecting piece 23b can be flipped using a mold insert while the connecting piece is being cut out in step 22. In this embodiment, firstly... Figure 3 In step (g), slightly punch a gap outwards in the connecting piece 23b, and then...Figure 3 In (i) of Figure 3 , the connecting piece 23c is gradually turned outward and opened by using a mold to press the connecting piece 23c from the lower edge gap.

[0055] Preferably, referring to Figure 2 In (d) and (e) of Figure 3 , the lower edge of the base blank 20b is also crimped to form a second crimp 221. In this case, the end of the base blank 20b can be crimped into the second crimp 221 at one time, or the pre-crimping 221a in (d) of Figure 3 can be performed first, and then the crimping into the second crimp 221 in (e) of Figure 3 can be performed. The processing of the second crimp 221 can be performed before the connecting piece 23b is cut, or after the connecting piece 23 is formed, or between the processing of the turning connecting piece 23. Figure 2 Figure 2 In (d) of Figure 3 , the pre-crimping 221a is performed, and then in (e) of Figure 3 , the crimping into the second crimp 221 is performed.

[0056] Preferably, referring to Figure 3 In (g) of Figure 3 , the upper edge of the base blank 20b is crimped to form a third crimp 211. In this case, the third crimp 211 can also be formed before the connecting piece is formed, for example, the second crimp 221 can be formed first, and then the third crimp 211 can be formed, or the third crimp 211 can be formed first, and then the second crimp 221 can be formed. The processing of the third crimp 211 can be performed before the connecting piece 23b is cut, or after the connecting piece 23 is formed, or between the processing of the turning connecting piece 23. In this case, the upper edge of the base blank 20b can be crimped into the third crimp 211 at one time, or the pre-crimping 211a in (d) of Figure 3 can be performed first, and then the crimping into the third crimp 211 in (g) of Figure 3 can be performed. Figure 2 Figure 3 In (d) of Figure 3 , the pre-crimping 211a is performed, and then in (g) of Figure 3 , the crimping into the third crimp 211 is performed.

[0057] Preferably, referring to Figures 4 to 13 The metal cover and the metal base are assembled, including steps 31 and 32.

[0058] Step 31, referring to Figures 4 to 6 The metal cover 10 is covered on the metal base 20, so that the pivot part 14 extends into the clamping area 231a, and the connecting piece 23a extends to the mounting hole 13.

[0059] Step 32, referring to Figure 9 and Figure 10 , and Figure 12 and Figure 13 The connecting piece 23a is bent from the outside of the mounting hole 13 to the inside of the mounting hole 13 to form the connecting piece 23 (along the direction of the arrow in the figure).​​​The connecting piece 23a) is bent in the direction of the arrow in the figure, and a pivot cavity 231 that at least partially surrounds the pivot part 14 is formed in the connecting piece 23, so that the pivot part 14 is rotatably connected to the pivot cavity 231 and restricts the metal cover 10 from disengaging from the metal base 20, thereby causing the metal cover 10 to rotate about the metal base 20 about the pivot part 14 as the axis of rotation to open and close the upper opening of the metal base 20.

[0060] Preferably, the end of the connecting piece 23 is bent upward or downward to prevent scratching the user, and can also be bent to the inside of the cover sidewall 12 or the inside of the pivot 14 to further prevent the metal cover 10 and the metal base 20 from separating.

[0061] Among them, such as Figure 1 As shown in (d) and (e), during the fabrication of the metal cover 10, the lower edge of the flap sidewall 12 is also rolled to form a first rolled edge 123. The lower edge of the mounting hole 13 is adjacent to or extends to the first rolled edge 123, so that the pivot portion 14 is rolled (see reference). Figure 6 and Figure 10 This facilitates relative rotation between the metal cover 10 and the metal base 20. In this embodiment, the first rolled edge 123 is annular, so that the pivot portion 14 is annular. Of course, the first rolled edge 123 can also be an elliptical ring or an irregular arc forming a ring, so that the pivot portion 14 is correspondingly an elliptical ring or an irregular arc forming a ring.

[0062] In this embodiment, the first rolled edge 123 is an inward rolled edge. Of course, the first rolled edge 123 can also be an outward rolled edge.

[0063] In this design, the position where the connecting piece 23 is cut is spaced from the upper edge of the metal base 20. This design ensures that the upper edge of the metal cover has no gaps, making it less likely to injure hands. Of course, in another embodiment, the connecting piece 23 can also be cut directly from the upper edge of the metal base 20, or from the lower edge of the third rolled edge 211 of the metal base 20.

[0064] A sealing ring 30 is also sandwiched between the top of the metal cover 10 and the upper edge of the metal base 20. The sealing ring 30 can be a silicone ring, a plastic ring, etc.

[0065] Unlike the previous method that used latching protrusions 121 and latching recesses 122 to fasten the metal cover 10 to the metal base 20 and close the upper opening of the metal base 20, this method uses latching protrusions 121 and latching recesses 122. (See reference) Figure 11 , Figure 14 and Figure 15, the first edge 123 is an inner edge, when the metal base is made, a clamping hole 42 is formed on the top ring 21 opposite to the connecting piece 23b, and a through hole 41 is formed on the bottom ring 22 opposite to the connecting piece 23b; a clamping switch assembly 40 is provided, the clamping switch assembly 40 comprises a clamping body 43, a flexible arm 44 which is bent and extended to the lateral sides of the clamping body 43, a spherical protrusion 45 which is formed on the clamping body 43 and can be matched to extend into the clamping hole 42, and a switch protrusion 46 which is formed on the clamping body 43 and can be matched to extend into the through hole 41, the ends of the two flexible arms 44 are fixed on the inner side wall of the metal base 20 by rivets 47, and the spherical protrusion 45 extends out of the side wall of the metal base 20 through the clamping hole 42, and the switch protrusion 46 also extends out of the side wall of the metal base 20 through the through hole 41, pressing or releasing the switch protrusion 46 can drive the spherical protrusion 45 to extend into the clamping hole 42 or extend out of the clamping hole 42 under the action of elasticity; when the metal cover 10 is covered on the metal base 20, the spherical protrusion 45 is clamped on the first edge 123.

[0066] Preferably, the clamping switch assembly 40 further comprises a switch button 48 which is fixedly installed outside the switch protrusion 46. Among them, the switch button 48 is clamped on the switch protrusion 46, of course, the switch button 48 can also be welded or riveted on the switch protrusion 46.

[0067] Among them, when the metal base 20 is buckled on the can body, the gap left by the cutting of the connecting piece 23c of the side wall of the metal base 20 will be covered by the side wall of the can body.

[0068] Among them, the metal cover 10 covers the metal base 20 and can close or open the upper opening of the metal base 20, and the metal base 20 can be sleeved on the can body. The all-metal can suitable for the all-metal cover of the present application can be used to contain solid objects, such as powdered food, milk powder, etc.

[0069] The above only discloses the preferred embodiments of the present application, of course, cannot limit the scope of the present application, therefore, the equivalent changes made in the patent range of the present application still belong to the scope covered by the present application.

Claims

1. A method of making an all-metallic can end, the method comprising: The application relates to a metal cover and a metal base. ​ The application comprises: manufacturing a metal cover: stamping a thin metal sheet into a flip cover blank, which comprises an integrated cover top and a side wall blank; punching a mounting hole in the middle of the side wall blank to process the side wall blank into a flip cover side wall, and forming a pivot part between the mounting hole and the lower edge of the flip cover side wall; manufacturing a metal base: stamping a thin metal sheet into a ring-shaped base blank; cutting a connecting piece from the side wall of the base blank downwards to connect the lower edge of the connecting piece to the side wall of the base blank; turning the connecting piece outward to form a clamping area; 2. The all-metallic can lid manufacturing method according to claim 1, characterized by: assembling the metal cover and the metal base: covering the metal cover on the metal base and making the pivot part extend into the clamping area and be clamped between the turned-out connecting piece and the side wall of the base blank; bending the connecting piece around the pivot part and into the mounting hole to form a pivot cavity which at least semi-surrounds the pivot part, and making the pivot part pivotally installed in the pivot cavity and limiting the metal cover from being separated from the metal base, so that the metal cover is turned around the metal base with the pivot part as the pivot axis to open and close the upper opening of the metal base.

3. The all-metallic can lid manufacturing method according to claim 2, characterized by: When the metal cover is manufactured, the lower edge of the flip cover side wall is also processed by edge rolling to form a first edge rolling, so that the pivot part has an edge rolling structure.

4. The all-metallic can lid manufacturing method according to claim 1, characterized by: The lower edge of the mounting hole is adjacent to or extends to the first edge rolling, so that the pivot part has a circular ring shape; and the first edge rolling has a circular ring shape in cross section, so that the pivot part has a circular ring shape.

5. The all-metallic can lid making method according to claim 1, wherein: The thin metal sheet is a tinplate sheet, an aluminum sheet or a stainless steel sheet, and the thickness of the thin metal sheet is 0.15-0.3 mm.

6. The all-metallic can lid making method according to claim 1, wherein: The position of cutting the connecting piece is spaced from the upper edge of the metal base; when the metal base is manufactured, the lower edge of the metal base is also edge rolled to form a second edge rolling, and the upper edge of the metal base is also edge rolled to form a third edge rolling. The stamping of the thin metal sheet into the ring-shaped base blank specifically comprises: stamping the thin metal sheet into a ring-shaped base preblank; 7. The all-metallic can lid making method according to claim 6, wherein: indenting the upper half of the side wall of the base preblank inward to form a top ring, and the lower half which is not indented forms a bottom ring, the diameter of the top ring is smaller than that of the bottom ring, a cover abutting table is formed between the top ring and the bottom ring, and the base preblank is processed into a base blank.

8. The all-metallic can lid manufacturing method according to claim 6, characterized by: The base preblank comprises a first ring and a second ring which has a table structure between the first ring, and the diameter of the second ring is larger than that of the first ring; when the upper half of the side wall of the base preblank is indented inward to form a top ring, the upper half of the side wall of the second ring is indented inward to form a top ring in communication with the first ring.

9. The all-metallic can lid making method according to claim 1, wherein: When the connecting piece is cut from the side wall of the base blank downwards to connect the lower edge of the connecting piece to the side wall of the base blank, the cutting is performed to the cover abutting table, so that the lower edge of the connecting piece is connected to the upper edge of the bottom ring. When the metal cover is manufactured, the lower edge of the flip cover side wall is also processed by edge rolling to form a first edge rolling, and the first edge rolling is an inner edge rolling. The metal base is further provided with a snap-fit hole and a through hole on the side wall of the metal base opposite to the connecting piece, the snap-fit hole is above the through hole, and the snap-fit hole is covered when the metal cover is covered, and the through hole is exposed when the metal cover is covered; The snap-fit switch assembly includes a snap-fit body, elastic arms extending from the snap-fit body to both sides, a spherical protrusion formed on the snap-fit body and capable of being inserted into the snap-fit hole, and a switch protrusion formed on the snap-fit body and capable of being inserted into the through hole, the ends of the two elastic arms are fixed to the inner side wall of the metal base by rivets, the spherical protrusion extends out of the side wall of the metal base through the snap-fit hole, and the switch protrusion extends out of the side wall of the metal base through the through hole, pressing or releasing the switch protrusion can drive the spherical protrusion to extend into or extend out of the snap-fit hole under the action of elasticity. When the metal cover is covered on the metal base, the spherical protrusion is snap-fitted on the first curled edge.

10. An all-metallic can end characterized by: The full metal can cover is made by the method of any one of claims 1-9; The full metal can cover includes a metal base and a metal cover, the metal cover is rotatably connected to the metal base and can be flipped relative to the metal base to open or close the upper opening of the metal base, and the metal base can be sleeved on a can body; The metal cover includes an integrated cover top and cover side wall, a through mounting hole is formed in the cover side wall of the metal cover, and a pivot portion is formed between the mounting hole and the bottom edge of the cover side wall; The side wall of the metal cover is cut downward and bent outward to form a metal connecting piece connected to the side wall of the metal cover, the metal connecting piece is matched with the position of the pivot portion, and after being bent outward, it is flipped inward through the mounting hole to form a pivot cavity at least semi-enclosing the pivot portion, so that the pivot portion is rotatably connected in the pivot cavity and is limited to be separated from the metal base, and the metal cover is flipped around the metal base with the pivot portion as the rotation axis to open or close the upper opening of the metal base.

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