All-metal can cover manufacturing method and all-metal can cover

Abstract

The invention discloses an all-metal can cover manufacturing method and an all-metal can cover. The manufacturing method comprises the steps that a thin metal sheet is punched into a turning cover blank, a mounting hole is punched in the turning cover side wall of the turning cover blank, and a pivoting part is arranged between the mounting hole and the lower edge of the turning cover side wall; stamping the thin metal sheet into a ring-shaped base blank; a connecting piece is cut downwards from the side wall of the base blank, and the connecting piece is turned outwards to be opened to form a clamping area; the metal cover body covers the metal base, so that the pivoting part extends into the clamping area, and the connecting piece is bent towards the interior of the mounting hole and forms a pivoting cavity which at least half surrounds the pivoting part, so that the pivoting part rotates in the pivoting cavity and the metal cover body is prevented from being separated from the metal base; and the metal cover body turns around the metal base by taking the pivoting part as a rotating shaft so as to open and close the upper opening of the metal base. The process is simple, the cost is low, and the manufactured all-metal can is simple in structure, good in abrasion resistance, attractive and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the field of metal packaging, and in particular to a method for manufacturing a full metal can cover and a full metal can cover. Background Art

[0002] At present, common packaging materials in the packaging field are glass, paper, plastic, metal and composite materials. Among the above materials, glass has poor impact resistance and is too heavy, with limited places of use, making it difficult to use for disposable packaging; paper has poor sealing and corrosion resistance, and plastic has serious pollution; metal packaging has both good sealing and good corrosion resistance, but the cost of metal packaging is often relatively high. Currently, tinplate is often used as a common material for metal packaging.

[0003] Tinplate, also known as tin-plated steel sheet, refers to cold-rolled low-carbon steel sheet or strip coated with commercial pure tin on both sides. Tin mainly prevents corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in one material, and has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility. However, when using tinplate containers, plastic lids are often used as the lids of tinplate containers. It is difficult to print the can body and the can lid using the same process, which makes the appearance of the container not beautiful enough, and the lid will still cause pollution when the can is recycled.

[0004] Referring to Chinese patent CN202021250113, when a metal cover is used as the lid of a container, the cover and the container body are often completely separated. The cover is connected to the container body through a threaded connection or directly snapped onto the container body. This connection method often brings inconvenience to users during use.

[0005] For this purpose, referring to Chinese patent CN 218432650U, a metal can cover is disclosed, wherein the metal can cover comprises a metal top cover, a metal bottom ring and a rotating shaft, wherein the metal top cover and the metal bottom ring are respectively curled to form a hollow scroll surrounding the rotating shaft, so that the metal top cover can be flipped open and closed relative to the metal bottom ring. However, although this can cover is a full metal can cover, the structure between the metal top cover and the metal bottom ring is complicated, and they must be rotatably connected by means of a rotating shaft.

[0006] Referring to Chinese patent CN 218752383U, a can lid is disclosed, comprising a base, an upper cover and a pivoting member, wherein the upper cover and the base are metal parts, and the pivoting member is a plastic part and has two parts that can rotate relatively, and the two parts of the plastic part are respectively engaged with the upper cover and the base, so that the upper cover can be flipped and opened relative to the base. Although this structure is relatively simple, it still requires the participation of plastic parts. Plastic parts are not only more fragile than metal bodies, but also easy to break and damage, thereby affecting the overall stability and protection of the lid. Moreover, the texture and color of the plastic connector are difficult to completely match with the metal lid. If the fusion is not clever enough, it will appear abrupt visually, lowering the overall beauty and exquisiteness of the product. In terms of environmental protection, the metal lid is originally a material that is easy to recycle. After adding the plastic connector, due to the completely different recycling processes of metal and plastic, the difficulty of separation and recycling increases. If it is not handled properly, it will cause more waste of resources, which is not in line with the current environmental protection trend. Therefore, the existing can lids have high requirements for the processing accuracy of the connection parts, and the installation requirements are high, requiring the plastic connector and the metal cover to fit tightly together. In addition, the batch production efficiency is low and the production cost is high. At the same time, the connection is easy to wear and fall off, which is not beautiful enough.

[0007] Therefore, there is an urgent need for a method for making a full metal can cover and a full metal can cover that can solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a method for manufacturing an all-metal can cover and an all-metal can cover, which have simple process and low cost, and the manufactured all-metal can has a simple structure, good wear resistance, and is beautiful and environmentally friendly.

[0009] In order to achieve the above-mentioned purpose, the present invention provides a method for manufacturing an all-metal can cover, comprising: manufacturing a metal cover body: punching a thin metal sheet into a flip-cover blank, the flip-cover blank comprising a cover top and a side wall blank that are integrally connected; 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 portion between the mounting hole and the lower edge of the flip-cover side wall; manufacturing a metal base: punching a thin metal sheet into a ring-shaped base blank; cutting a connecting piece with a lower edge connected to the side wall of the base blank downwardly from the side wall of the base blank; flipping the connecting piece outward Open to form a snap-fitting area; assemble the metal cover and the metal base: cover the metal cover on the metal base and make the pivot part extend into the snap-fitting area and be clamped between the flipped and opened connecting piece and the side wall of the base blank; surround the pivot part and bend the connecting piece into the mounting hole to form a pivot cavity that at least half surrounds the pivot part, so that the pivot part is rotatably installed in the pivot cavity and limits the metal cover from being separated from the metal base, thereby making the metal cover flip 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, when manufacturing the metal cover, the lower edge of the flip cover side wall is also curled to form a first curl, so that the pivoting portion has a curling structure, which facilitates the relative rotation between the metal cover and the metal base.

[0011] Specifically, the lower edge of the mounting hole is close to or extends to the first curling edge, so that the pivoting portion is in a curling shape.

[0012] Specifically, the cross section of the first curling edge is annular, so that the pivoting portion is annular. The annular shape can be a regular annular ring or an irregular annular ring, such as an irregular arc-shaped annular ring, so that the rotation between the metal cover and the metal base is smoother.

[0013] Preferably, there is a distance between the position where the connecting piece is cut and the upper edge of the metal base. This solution ensures that there is no gap on the upper edge of the metal cover, which is not easy to hurt hands.

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

[0015] Preferably, punching a thin metal sheet into a ring-shaped base blank specifically includes: punching the thin metal sheet into a ring-shaped base pre-blank; indenting the upper half of the side wall of the base pre-blank inward to form a top ring, and the unindented lower half forms a bottom ring, the top ring has a smaller diameter than the bottom ring and forms a cover abutment platform between the top ring and the bottom ring, and the base pre-blank is processed into the 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 abutment platform.

[0016] Specifically, the base preform includes a first circle and a second circle with a connecting platform of a platform structure between the first circle, the second circle has a larger diameter than the first circle, and when the upper half of the side wall of the base preform is retracted inward to form a top circle, the upper half of the side wall of the second circle is connected to the first circle and retracted inward to form the top circle. When the full metal can lid is assembled with the can body, the metal base is sleeved and placed on the outer side of the upper end of the can body, and the side wall of the can body not only covers the notch cut out 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 platform, and the lower edge of the indentation abuts against the cover abutment platform at the corner of the can body.

[0017] Specifically, when manufacturing the metal cover, the lower edge of the side wall of the flip cover is also curled to form a first curl, and the first curl is an inner curl; when manufacturing the metal base, a snap-fit ​​hole and a through hole are opened at a position where the side wall of the metal base is opposite to the connecting piece, the snap-fit ​​hole is located above the through hole, and the snap-fit ​​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 portion exposed when the metal cover is closed; a snap-fit ​​switch assembly is provided, and the snap-fit ​​switch assembly includes a snap-fit ​​body, an elastic arm bent and extended from the snap-fit ​​body to both sides, and a snap-fit ​​body formed on the snap-fit ​​body and The spherical protrusion that can be matched with the engaging hole and the switch protrusion that is formed on the engaging body and can be matched with the through hole are fixed to the inner side wall of the metal base through rivets, and the spherical protrusion is extended to the outside of the side wall of the metal base through the engaging hole, and the switch protrusion is extended to the outside 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 inwardly into the engaging hole or extend outwardly under the elastic action; when the metal cover is covered on the metal base, the spherical protrusion is engaged with the first curling edge. This solution makes the metal cover and the metal base engage more tightly, which is convenient for the metal cover to seal the opening on the metal base.

[0018] The present invention also provides a full metal can lid, which is made by the above-mentioned full metal can lid manufacturing method. The full metal can lid comprises a metal base and a metal cover body, wherein the metal cover body 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 the can body; the metal cover body comprises a cover top and a cover body side wall which are integrally connected, and a through mounting hole is provided on the cover body side wall of the metal cover body, and a pivot portion is formed between the mounting hole and the bottom edge of the cover body side wall; the side wall of the metal cover body is cut downward and bent outward to form a metal connecting piece with a lower edge connected to the side wall of the metal cover body, and the metal connecting piece is matched with the position of the pivot portion, and after bending outward, it is flipped inward through the mounting hole to form a pivot cavity which at least half surrounds the pivot portion, so that the pivot portion is rotatably connected to the pivot cavity and the metal cover body is restricted from being separated from the metal base, so that the metal cover body is flipped around the metal base with the pivot portion as the rotation axis to open and close the upper opening of the metal base.

[0019] Compared with the prior art, after the blanks of the metal cover and the metal base are made, the present invention only needs to cut out the mounting holes and the connecting pieces on the side walls of the metal cover and the metal base respectively, and then when the two are assembled, the connecting pieces are turned over and curled inward to wrap the pivot part formed after the cutting of the mounting holes, so that the metal cover and the metal base can be rotatably connected together, with simple process and low cost, and the rotating shaft is directly formed on the side wall of the metal cover without the need for separate production. On the other hand, because the all-metal can cover and the metal base are rotatably connected through the bent metal connecting piece and the pivot part, they have good wear resistance, are beautiful, environmentally friendly, and easy to recycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a production flow chart of the metal cover of the present invention.

[0021] Figure 2 It is a production flow chart of the front half of the metal base of the present invention.

[0022] Figure 3 It is a production flow chart of the second half of the metal base of the present invention.

[0023] Figure 4 It is a structural diagram of the metal cover and the metal base of the present invention when they are assembled.

[0024] Figure 5 yes Figure 4 sectional view of .

[0025] Figure 6 yes Figure 5 Enlarged view of part a.

[0026] Figure 7 It is a structural diagram of the metal cover and the metal base of the present invention after being assembled.

[0027] Figure 8 yes Figure 7 It is an exploded view.

[0028] Fig. 9 yes Figure 7 sectional view of .

[0029] Fig.10 yes Fig. 9 Enlarged view of part b.

[0030] Fig.11 yes Fig. 9 Enlarged view of part c.

[0031] Fig.12 It is a structural diagram of the metal cover of the present invention being flipped open relative to the metal base.

[0032] Fig.13 yes Fig.12 Enlarged view of part d.

[0033] Fig.14 It is a three-dimensional diagram of the metal base of the present invention.

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

[0035] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0036] The present invention provides a method for manufacturing a full metal can cover, comprising the steps of: referring to Figures 1 to 3 , make the metal cover 10, make the metal base 20, refer to Figure 6 and Fig.10 , assemble the metal cover 10 and the metal base 20 so that the metal cover 10 is rotatably 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 the can body (the can body includes a can body and a bottom cover located at the bottom of the can body). The steps of making the metal cover 10 and the steps of making the metal base 20 are performed independently and there is no specific order.

[0037] refer to Figure 1 , manufacturing the metal cover 10 includes step 11 and step 12.

[0038] Step 11 includes: stamping a thin metal sheet to form a flip cover blank 10a (such as Figure 1 As shown in (d) in the figure, the flip cover blank includes a cover top 11 and a side wall blank 12a formed by bending and extending downward along the periphery of the cover top 11.

[0039] Specifically, step 11 includes: referring to Figure 1 In (a), the thin metal sheet is stamped to form a cover blank 10a consisting of a cover top 11 and a side wall blank 12a, and the ends of the side wall blank 12a are bent outward to form a surplus; Figure 1 (b) in the embodiment of the present invention is to cut the remaining material 12a on the side wall blank 12a of the cover body blank; Figure 1 In (c) and (d), the end of the side wall blank 12a is curled to form a first curling edge 123 to form the flip cover blank 10a.

[0040] The end of the side wall blank 12a can be rolled into the first curling edge 123 at one time, or the following steps can be performed first: Figure 1 The pre-curled edge 123a in (c) is Figure 1 (d) in the figure is rolled into a first rolled edge 123.

[0041] Step 12, Reference Figure 1 In (e), a mounting hole 13 having a spacing from the lower edge of the side wall blank 12a is punched out on the side wall blank 12a to process the side wall blank 12a into a flip cover side wall 12, and the portion between the mounting hole 13 and the lower edge of the flip cover side wall 12 is called a pivot portion 14.

[0042] Among them, the first curled edge 123 is processed before the mounting hole 13 is stamped, which can prevent the lower edge of the side wall blank 12a from twisting and deforming when the mounting hole 13 is stamped, so that the shape of the lower edge of the side wall blank 12a is stable, preventing the metal cover 10 from being unable to match the metal base due to the stamping of the mounting hole 13.

[0043] Continue to refer Figure 1 In (e), while punching out the mounting hole 13 on the side wall blank 12a, a snap protrusion 121 protruding inward is punched out at a position of the side wall blank 12a opposite to the mounting hole 13. When the metal base 20 is subsequently manufactured, a snap recess 122 that is recessed inward and cooperates with the snap protrusion 121 is punched out at a corresponding position of the base blank 20b.

[0044] refer to Figure 2 , making the metal base includes step 21, step 22 and step 23.

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

[0046] Step 21, stamping the thin metal sheet to form a ring-shaped base blank 20b specifically includes: Figure 2 In (a), the thin metal sheet is stamped to form a ring-shaped base pre-blank 20a surrounded by a side wall.

[0047] The processing steps of the base pre-blank 20a are as follows: first, a cup-shaped blank is punched out, the blank includes a disc bottom, a first circle of pre-punched side walls formed by bending and extending downward from the disc bottom, a pre-filling platform formed by bending and extending outward from the lower end of the first circle of pre-punched side walls, and a second ring 202 formed by bending and extending downward from the end of the pre-filling platform; the above-mentioned blank is punched twice, so that the first circle of pre-punched side walls shrinks inward to form a first circle 201 of preset size, and the pre-filling platform expands to a connection platform 26 of preset size. Finally, the disc bottom of the blank is punched, and the disc bottom is punched open to form an opening of the first circle 201, thereby forming a ring-shaped 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 connection platform 26 for contacting with the inner side of the can body between the first circle 2021 and the second circle 202.

[0048] refer to Figure 2 In (b), the upper half of the side wall of the base pre-blank 20a is retracted 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 body abutment platform 24 is formed between the top ring 21 and the bottom ring 22, so that the base pre-blank 20a is processed into the base blank 20b. Specifically, the upper half of the side wall of the second ring 202 is retracted inward to form the top ring 21, so the cover body abutment platform 24 is located on the side wall of the second ring 202, so as to divide the second ring 202 into the third ring 203 and the bottom ring 22, and the top ring 21 is composed of the first ring 201 and the third ring 203.

[0049] The lower side of the bottom ring 22 also has a residual material 220 that is bent outward. Figure 2 In (c), the remaining material 220 on the lower side of the bottom ring 22 is also cut off.

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

[0051] The bottom ring 22 of the base blank 20b is punched out at a position adjacent to the cover body abutment platform 24 to form the connecting piece 23b. The connecting piece 23b is an unturned connecting piece.

[0052] refer to Figure 3 In step (f), a plurality of engagement protrusions 25 for engagement with the can body are punched inwardly on the side wall of the third circle 203 in the base blank 20b. The engagement protrusions 25 are inverted triangles, have high engagement stability with the can body, and are not easy to break through the side wall of the third circle 203 when punching. This step can be performed simultaneously with the cutting of the connecting piece 23b, or can be performed sequentially, and the order can be interchanged.

[0053] Step 23, reference Figure 3 In (i), the connecting piece 23b is turned outward and opened to form a connecting piece 23a, and a snap-fitting area 231a is formed between the connecting piece 23a and the side wall of the base blank.

[0054] The connecting piece 23b can be pushed outwardly by a sliding block on a mold inserted into the base blank, so that the connecting piece 23b is turned outwardly to form the connecting piece 23a. The connecting piece 23b can also be pushed down from above and turned over to form the connecting piece 23a. Even when the connecting piece is cut out in step 22, the connecting piece 23b can be turned over by a mold block. Figure 3 In (g), the connecting piece 23b is slightly punched outward to open a gap, and then Figure 3 In (i), a mold is used to pressurize the connecting piece 23c from the bottom edge of the gap, so that it gradually turns outward and opens to form the connecting piece 23a.

[0055] The better, reference Figure 2 In (d) and (e), the lower edge of the base blank 20b is also curled to form a second curling edge 221. The end of the base blank 20b can be curled into the second curling edge 221 at one time, or the following steps can be performed first: Figure 2 The pre-curled edge 221a in (d) is Figure 2 (e) is rolled into the second curling edge 221. The processing of the second curling edge 221 can be performed before the connecting piece 23b is cut, or after the connecting piece 23 is formed, or before the connecting piece 23 is turned over.

[0056] refer to Figure 3 In (g), the upper edge of the base blank 20b is curled to form a third curl 211. The third curl 211 can also be performed before the connecting piece is formed. For example, the second curl 221 can be formed first, and then the third curl 211 can be formed. The third curl 211 can also be formed first and then the second curl 221 can be formed. The processing of the third curl 211 can be performed before the connecting piece 23b is cut, or it can be performed after the connecting piece 23 is formed, or it can be performed before the processing and flipping of the connecting piece 23. The upper edge of the base blank 20b can be rolled into the third curl 211 at one time, or it can be performed first as shown in the figure. Figure 2 The pre-curled edge 211a of (d) is then Figure 3 (g) in the figure is rolled into a third rolled edge 211.

[0057] refer to Figures 4 to 13 , assembling the metal cover and the metal base, including step 31 and step 32.

[0058] Step 31, reference Figures 4 to 6 , the metal cover 10 is covered on the metal base 20 , so that the pivoting portion 14 extends into the engaging area 231 a and the connecting piece 23 a extends to the mounting hole 13 .

[0059] Step 32, reference Fig. 9 and Fig.10 ,as well as Fig.12 and Fig.13 , bend the connecting piece 23a from the outside of the mounting hole 13 to the inside of the mounting hole 13 to form a connecting piece 23 (along Figure 6The connecting piece 23a is flipped and bent in the direction of the arrow in FIG. 2 , and a pivot cavity 231 that at least half surrounds the pivot portion 14 is formed in the connecting piece 23, so that the pivot portion 14 is rotatably connected in the pivot cavity 231 and limits the metal cover 10 from being separated from the metal base 20, thereby allowing the metal cover 10 to flip around the metal base 20 with the pivot portion 14 as the rotation axis 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 inner side of the cover side wall 12 or the inner side of the pivot portion 14 to further prevent the metal cover 10 and the metal base 20 from detaching.

[0061] Among them, Figure 1 As shown in (d) and (e), when the metal cover 10 is manufactured, the lower edge of the flip cover side wall 12 is also curled to form a first curling edge 123, and the lower edge of the mounting hole 13 is adjacent to or extends to the first curling edge 123, so that the pivoting portion 14 is curled (refer to Figure 6 and Fig.10 ). It is convenient for the metal cover 10 and the metal base 20 to rotate relative to each other. In this embodiment, the first curling edge 123 is in a circular ring shape, so that the pivoting portion 14 is in a circular ring shape. Of course, the first curling edge 123 can also be in an elliptical ring or an irregular arc surrounded by a ring shape, so that the pivoting portion 14 is correspondingly in an elliptical ring or an irregular arc surrounded by a ring shape.

[0062] In this embodiment, the first curling edge 123 is an inner curling edge. Of course, the first curling edge 123 can also be an outer curling edge.

[0063] The position where the connecting piece 23 is cut is spaced from the upper edge of the metal base 20, so that the upper edge of the metal cover has no gap and is not easy to hurt the hand. 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 curling edge 211 of the metal base 20.

[0064] A sealing ring 30 is 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] Different from the above, the metal cover 10 is fastened to the metal base 20 by using the fastening protrusion 121 and the fastening recess 122 to close the upper opening of the metal base 20. Fig.11 , Fig.14 and Fig.15The first curling edge 123 is an inner curling edge. When the metal base is made, a snap-fitting hole 42 is provided at a position where the top ring 21 is opposite to the connecting piece 23b, and a through hole 41 is provided at a position where the bottom ring 22 is opposite to the connecting piece 23b; a snap-fitting switch assembly 40 is provided, and the snap-fitting switch assembly 40 includes a snap-fitting body 43, an elastic arm 44 that is bent and extended from the snap-fitting body 43 to both sides in the lateral direction, a spherical protrusion 45 formed on the snap-fitting body 43 and capable of being matched and extended into the snap-fitting hole 42, and a switch protrusion 45 formed on the snap-fitting body 43 and capable of being matched and extended into the through hole 41 The ends of the two elastic arms 44 are fixed to the inner wall of the metal base 20 by rivets 47, and the spherical protrusion 45 passes through the engaging hole 42 and extends to the outside of the side wall of the metal base 20, and the switch protrusion 46 passes through the through hole 41 and extends to the outside of the side wall of the metal base 20. Pressing or releasing the switch protrusion 46 can drive the spherical protrusion 45 to extend inward into the engaging hole 42 or extend outward under the elastic action; when the metal cover 10 is covered on the metal base 20, the spherical protrusion 45 is engaged with the first curling edge 123.

[0066] More preferably, the snap-on switch assembly 40 further includes a switch button 48, which is fixedly mounted on the outside of the switch protrusion 46. The switch button 48 is snap-connected to the switch protrusion 46, and of course, the switch button 48 can also be welded or riveted to the switch protrusion 46.

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

[0068] 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 to which the all-metal cover of the present invention is applicable can be used to hold solid objects, such as powdered food milk powder, etc.

[0069] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A method for manufacturing a full metal can cover, characterized in that: include: Making a metal cover body: stamping a thin metal sheet into a flip cover blank, wherein the flip cover blank comprises a cover top and a side wall blank that are integrally connected; A mounting hole is punched out in the middle of the side wall blank to process the side wall blank into a flip cover side wall, and a pivot portion is formed between the mounting hole and the lower edge of the flip cover side wall; Making the metal base: stamping a thin metal sheet into a ring-shaped base blank; A connecting piece having a lower edge connected to the side wall of the base blank is cut downwardly from the side wall of the base blank; Turning the connecting piece outward to form a snap-fitting area; Assemble the metal cover and the metal base: cover the metal cover on the metal base and allow the pivot portion to extend into the snap-fit ​​area and be clamped between the flipped and opened connecting piece and the side wall of the base blank; surround the pivot portion and bend the connecting piece into the mounting hole to form a pivot cavity that at least half surrounds the pivot portion, so that the pivot portion is rotatably installed in the pivot cavity and limits the metal cover from detaching from the metal base, thereby allowing the metal cover to flip around the metal base with the pivot portion as the rotation axis to open and close the upper opening of the metal base.

2. The method for making a full metal can lid according to claim 1, characterized in that: When manufacturing the metal cover body, the lower edge of the side wall of the flip cover is also curled to form a first curl, so that the pivoting portion has a curling structure.

3. The method for making a full metal can lid according to claim 2, characterized in that: The lower edge of the mounting hole is close to or extends to the first curling edge, so that the pivoting portion is in a curling shape; the cross section of the first curling edge is in a circular ring shape, so that the pivoting portion is in a circular ring shape.

4. The method for making a full metal can cover according to claim 1, characterized in that: 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 0.15mm-0.3mm.

5. The method for manufacturing a full metal can cover according to claim 1, characterized in that: The position where the connecting sheet is cut is spaced apart from the upper edge of the metal base; when the metal base is manufactured, the lower edge of the metal base is also curled to form a second curl, and the upper edge of the metal base is also curled to form a third curl.

6. The method for making a full metal can lid according to claim 1, characterized in that: The base blank for punching a thin metal sheet into a ring shape specifically includes: Punching the thin metal sheet into a ring-shaped base pre-blank; The upper half of the side wall of the base pre-blank is retracted inward to form a top ring, and the unretracted lower half forms a bottom ring. The diameter of the top ring is smaller than that of the bottom ring and a cover abutment platform is formed between the top ring and the bottom ring, so that the base pre-blank is processed into a base blank.

7. The method for making a full metal can lid according to claim 6, characterized in that: The base pre-blank includes a first circle and a second circle having a connecting platform with a platform-like structure between the first circle. The diameter of the second circle is greater than that of the first circle. When the upper half of the side wall of the base pre-blank is retracted inward to form a top circle, the upper half of the side wall of the second circle is connected to the first circle and retracted inward to form a top circle.

8. The method for manufacturing a full metal can lid according to claim 6, characterized in that: When a connecting piece with a lower edge connected to the side wall of the base blank is cut downward from the side wall of the base blank, the cutting is carried out to the cover body abutment platform so that the lower edge of the connecting piece is connected to the upper edge of the bottom ring.

9. The method for making a full metal can lid according to claim 1, characterized in that: When manufacturing the metal cover body, the lower edge of the side wall of the flip cover is also curled to form a first curl, and the first curl is an inner curl; When manufacturing the metal base, a snap-fit ​​hole and a through hole are also provided at a position on the side wall of the metal base opposite to the connecting piece, wherein the snap-fit ​​hole is located above the through hole, and the snap-fit ​​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 portion exposed when the metal cover is closed; A snap-on switch assembly is provided, the snap-on switch assembly comprising a snap-on body, elastic arms extending laterally from the snap-on body, a spherical protrusion formed on the snap-on body and capable of being inserted into the snap-on hole, and a switch protrusion formed on the snap-on 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, and the spherical protrusion is extended through the snap-on hole to the outside of the side wall of the metal base, and the switch protrusion is extended through the through hole to the outside of the side wall of the metal base, and pressing or releasing the switch protrusion can drive the spherical protrusion to extend inwardly into the snap-on hole or to extend outwardly under the elastic action; When the metal cover is covered on the metal base, the spherical protrusion is engaged with the first curling edge.

10. A full metal can cover, characterized in that: Made by the all-metal can cover manufacturing method described in any one of claims 1 to 9; The all-metal can cover comprises a metal base and a metal cover body, wherein the metal cover body 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 the can body; The metal cover body comprises a cover top and a cover side wall which are integrally connected, a through mounting hole is opened on the cover side wall of the metal cover body, 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 with a lower edge connected to the side wall of the metal cover. The metal connecting piece cooperates with the position of the pivot portion, and after bending outward, flips inward and passes through the mounting hole to form a pivot cavity that at least half surrounds the pivot portion, so that the pivot portion is rotatably connected in the pivot cavity and limits the metal cover from being separated from the metal base, thereby allowing the metal cover to flip around the metal base with the pivot portion as the rotation axis to open and close the upper opening of the metal base.

Images