EP4180349A1 - Can lid and manufacturing method therefor - Google Patents
Can lid and manufacturing method therefor Download PDFInfo
- Publication number
- EP4180349A1 EP4180349A1 EP21838754.6A EP21838754A EP4180349A1 EP 4180349 A1 EP4180349 A1 EP 4180349A1 EP 21838754 A EP21838754 A EP 21838754A EP 4180349 A1 EP4180349 A1 EP 4180349A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate thickness
- lid
- panel
- chuck wall
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000003825 pressing Methods 0.000 claims description 17
- 238000010409 ironing Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 9
- 238000004826 seaming Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/06—Integral, or permanently secured, end or side closures
- B65D17/08—Closures secured by folding or rolling and pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/42—Details of metal walls
- B65D7/44—Reinforcing or strengthening parts or members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
Definitions
- the present invention relates to a can lid and a manufacturing method therefor.
- a metal can for filling a beverage or the like therein hermetically encloses contents by seaming a can lid to an opening end of a bottomed cylindrical can barrel in a case of a two-piece can.
- the one with a stay-on tab type opening tab has been generally adopted.
- the can lid is seamed to the opening end of the can barrel after filling contents in the can barrel. For this reason, generally, the can lid is supplied to a filling destination in a stacked state separately from the can barrel.
- the can lid has a center panel part to which an opening tab is mounted, and has, on a surrounding side thereof, an annular groove part into which an outer edge projection of an inner tool (seaming chuck) of a seamer is inserted. Further, the can lid has a curl part to be seamed to the opening end of the can barrel at an outer circumference of the annular groove part (see, for example, PTL 1 described below).
- a panel wall part is shaped as a wall part in a groove at the annular groove part
- a chuck wall radius part is shaped at a portion extending from the wall part in the groove to an wall part outside the groove at the annular groove part
- a chuck wall part is shaped at a portion extending from the wall part outside the groove to the curl part.
- a metal can has been demanded to be reduced in plate thickness as much as possible in order to save material resources and reduce a weight thereof.
- strength pressure resistance
- the present invention has been proposed in order to address such a problem. It is an object of the present invention to provide a can lid with a high pressure resistance while meeting a demand for a smaller plate thickness on the basis of a stricter study on the plate thickness, or the like.
- a can lid in accordance with the present invention includes the following configuration.
- a can lid having a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part, characterized in that t2 > t1 holds, where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.
- a can lid having such a feature can provide the can lid with a high pressure resistance while meeting a demand of more reducing a plate thickness, and can attain an improvement of the pressure resistance at the can lid.
- a can lid 1 in accordance with an embodiment of the present invention has a center panel part 1A, a panel wall part 1B, a chuck wall radius part 1C, a chuck wall part 1D, and a curl part 1E.
- the center panel part 1A is a generally flat portion of a central portion of the can lid 1, and is provided with a score or an opening tab in a case of a stay-on type.
- a curve portion r1 At an outer edge of the center panel part 1A, there is a curve portion r1. A portion extending downward linearly from a terminal of the curve portion r1 is the panel wall part 1B. Then, a portion which is a curve portion r2 to be shaped under the panel wall part 1B, and includes the bottom of an annular groove part Cs to be shaped at an outer circumference of the center panel part 1A is the chuck wall radius part 1C. Further, a linear or partially curved potion extending upward from an outer upper end of the chuck wall radius part 1C, a portion from an outer wall of the annular groove part Cs further to a front of a curve of the curl part 1E, is the chuck wall part 1D.
- t2 > t1 holds, where t1 represents a plate thickness of the center panel part 1A, and t2 represents a plate thickness of a bottom end of the panel wall part 1B.
- the plate thickness t1 of the center panel part 1A is a value close to an original plate thickness of a material to be processed before shape processing of the can lid 1.
- the bottom end of the panel wall part 1B is a boundary portion between the chuck wall radius part 1C and the curve portion r2.
- the plate thickness t2 of the bottom end of the panel wall part 1B is made larger than the plate thickness t1. This enables the can lid 1 with a still higher pressure resistance in addition to a conventional shape design.
- the plate thickness t2 By making the plate thickness t2 larger than 1.01 times the plate thickness t1 (t2 > 1.01 * t1), it is possible to obtain a can lid 1 with a still higher pressure resistance.
- the can lid 1 by making a plate thickness t3, where t3 represents a plate thickness of the chuck wall radius part 1C, larger than the plate thickness t1, and preferably making the plate thickness t3 larger than 1.01 times the plate thickness t1 (t3 > 1.01 * t1), it is possible to obtain a can lid 1 with a high pressure resistance.
- t1 > t4 holds, where t4 represents a plate thickness of a middle part of the chuck wall part 1D, namely, a plate thickness at a position one half a substantial height of the can lid as shown in Fig. 1 . Accordingly, by making the middle part of the chuck wall part 1D thin, relatively less affected by a pressure resistance, it is possible to reduce a weight of the can lid 1 while keeping a prescribed pressure resistance.
- the can lid 1 by partially increasing the plate thicknesses of the panel wall part 1B and the chuck wall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1A, it is possible to further increase a pressure resistance in addition to the rationalization of the conventional shape design of the annular groove part Cs and the portion extending therefrom to the curl part 1E.
- the plate thicknesses of the panel wall part 1B and the chuck wall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1A can be made larger than the original plate thickness of the material to be processed (the plate thickness t1 of the center panel part 1A). For this reason, it becomes possible to reduce the original plate thickness of the material to be processed as much as possible, so that saving of material resources and weight reduction can be effectively implemented.
- the manufacturing process of the can lid 1 has a blank stamping step S1, an outer circumferential part drawing step S2, a panel part drawing step S3, and a panel part pressing down step S4 as shown in Fig. 2 .
- a shape body M1 shown in Fig. 3 at (a) is shaped by the step S1 to the step S3, and in the step S4, the shape body M1 is subjected to press down processing of a panel part p (a processed part to be processed into the center panel part 1A).
- shape bodies M2 and M3 shown in Fig. 3 at (b) and (c) are shaped, finally resulting in the can lid 1 shown in Fig. 3 at (d).
- the upper tool U includes an inner tool U1 and an outer tool U2.
- the lower tool L includes a fixed inner tool L1, a movable inner tool L2, a movable outer tool L3, and a fixed outer tool L4.
- a material to be processed M is inserted into between the upper tool U and the lower tool L.
- stamping by a processing surface a of the outer tool U2 and a processing surface b of the fixed outer tool L4 due to descent of the upper tool U shapes a shape body M01 in a disk shape.
- descent of the upper tool U causes the lower surface c of the outer tool U2 to press down the movable outer tool L3, so that a drawing processing on a shape body M03 progresses by a processing surface f of the outer tool U2 and a processing surface g of the movable inner tool L2 as shown in Fig. 5 at (b).
- center panel part 1A is shaped in the panel part p sandwiched between the lower surface of the inner tool U1 and the upper surface of the fixed inner tool L1. Subsequently, as shown in Fig. 8 at (b), the upper tool U and the lower tool L are disengaged, and a shaped product of the can lid 1 is taken out.
- the outermost circumferential part of the shaped product of the can lid 1 is curled into a shape suitable for seaming by a known method, and a sealing compound is applied to an inner surface portion thereof. Further, according to the intended purpose, the panel part is subjected to a step such as rivet processing, score processing, or caulking of a tab, resulting in completion of a can lid.
- the panel wall part 1B and the chuck wall radius part 1C are shaped by pressing down the panel part p which is the processed part to be processed into the center panel part 1A and the processed part to be processed into the chuck wall radius part 1C is forced into the groove part j. For this reason, a shape process is accomplished without direct touch between the processing surface of the process tool and the panel wall part 1B and the chuck wall radius part 1C. Further, pressing down of the panel part p causes the processed parts to be processed into the panel wall part 1B and the chuck wall radius part 1C to be applied with a compression stress in a direction orthogonal to a plate thickness direction. Accordingly, such plastic deformation as to result in an increase in plate thickness is performed.
- a die obtained by providing a fixed inner tool L10 with an ironing convex part k1 is used. Then, the shape body is ironed between an inner processing surface k2 of the outer tool U2 of the upper tool U and the ironing convex part k1. As a result, at the panel part drawing step S3, ironing can be added to the middle part of the chuck wall part 1D.
- ironing when ironing is added to a part (particularly, a central part) of the chuck wall part 1D, a plate thickness of a part of the chuck wall part 1D can be reduced. As a result of this, it is possible to effectively enhance the pressure resistance of the can lid 1 while satisfying a demand for saving material resources and reduction of the weight.
- the manufacturing process is a method for performing from blank stamping to the shaped product of the can lid 1 by one stroke in upper and lower dies.
- the series of steps can also be performed in a plurality of stages using different dies.
- an action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p in the panel part pressing down step S4 is maximized in a state depicted in Fig. 8 at (a), namely, in a state in which the processed part is forced into the bottom of the groove part j.
- a following control becomes possible: panel pressing down is divided into a plurality of stages; and at each stage, the panel pressing down is performed with the die including the groove bottom; as a result, the region to be increased in plate thickness is allowed to be wider.
- the can lid 1 was shaped with the manufacturing process.
- a plate thickness of each part was measured.
- the example is shown in Table 1 below.
- t5 is a plate thickness of the upper end of the panel wall part 1B.
- the plate thickness t2 is larger than 1.01 times the plate thickness t1.
- the plate thickness t2 and the plate thickness t3 are larger than 1.01 times the plate thickness t1.
- the plate thickness t4 is reduced by ironing, so that the metal portion of the processed part to be processed into the panel wall 1B and the chuck wall radius part 1C can be allocated as that much.
- the action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p can further increase the plate thicknesses t2 and t3.
- Such adjustment of the plate thickness could increase the pressure resistance as compared with Comparative Example accomplished by the conventional method in PTL 2.
- the can lid 1 in accordance with the embodiment of the present invention, it is possible to obtain the can lid 1 with a high pressure resistance while satisfying a demand for more reducing the plate thickness, and it becomes possible to improve the pressure resistance in the can lid 1.
- Canned goods obtained by seaming the can lid 1 to the can barrel can reduce a weight of a metal can relative to a content weight while ensuring the high pressure resistance.
- Fig. 11 is a view showing the measurement position of the plate thickness of the middle part of the chuck wall part, where Fig. 11 at (a) is a view showing the measurement position of another embodiment of Fig. 10 , and Fig. 11 at (b) is a view showing the measurement position of an embodiment.
- t1 > t4 holds, where t4 represents the plate thickness of the middle part of the chuck wall part 1D, namely, the plate thickness at the position at a height one half the substantial height of the can lid. Also in another embodiment, by making thin the middle part of the chuck wall part 1D relatively less affected by the pressure resistance, it is possible to reduce the weight of the can lid 1 while keeping a prescribed pressure resistance.
- the other embodiment of Fig. 11 at (a) and the embodiment of Fig. 11 at (b) show partial cross sections after seaming the portion of the can lid 1 of Fig. 10 and the portion of the can lid 1 of Fig. 1 to their can barrels, respectively. Even the comparison between state of Figs. 10 and 1 before seaming and states of Fig. 11 after seaming does not indicate a change in substantial height between before and after seaming of the can lid 1. Accordingly, the plate thicknesses t4 of the other embodiment Fig. 11 at (a) and the embodiment Fig. 11 at (b) are roughly at the same position.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
Description
- The present invention relates to a can lid and a manufacturing method therefor.
- A metal can for filling a beverage or the like therein hermetically encloses contents by seaming a can lid to an opening end of a bottomed cylindrical can barrel in a case of a two-piece can. For such a can lid, the one with a stay-on tab type opening tab has been generally adopted. The can lid is seamed to the opening end of the can barrel after filling contents in the can barrel. For this reason, generally, the can lid is supplied to a filling destination in a stacked state separately from the can barrel.
- The can lid has a center panel part to which an opening tab is mounted, and has, on a surrounding side thereof, an annular groove part into which an outer edge projection of an inner tool (seaming chuck) of a seamer is inserted. Further, the can lid has a curl part to be seamed to the opening end of the can barrel at an outer circumference of the annular groove part (see, for example,
PTL 1 described below). - Then, for a structure of such a can lid, a panel wall part is shaped as a wall part in a groove at the annular groove part, a chuck wall radius part is shaped at a portion extending from the wall part in the groove to an wall part outside the groove at the annular groove part, and a chuck wall part is shaped at a portion extending from the wall part outside the groove to the curl part.
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- [PTL 1]
Japanese Patent Application Publication No. 2019-112143 - [PTL 2]
Japanese Patent Application Publication No. H03-275443 - A metal can has been demanded to be reduced in plate thickness as much as possible in order to save material resources and reduce a weight thereof. However, when the plate thickness is reduced, strength (pressure resistance) matters in a case where the pressure in the can increases.
- For the can lid, when the pressure in the can increases, a force of pushing up the center panel part upward acts thereon. For this reason, when the pressure in the can increases abnormally, the annular groove part reversely projects upward, resulting in that the annular groove part and the center panel part may be in a state projecting upward in an angular shape, i.e., so-called buckling may be caused. Particularly, when the content is a carbonated drink, or the like, upon an abnormal increase in temperature in the can due to ambient environment or the like, buckling becomes more likely to be caused.
- To address this, for the structure of the can lid for increasing the pressure resistance, various countermeasures have been studied in, for instance, conventional art shown in the
PTL 1. However, with the countermeasures, as the foregoing conventional art, the importance has been placed only on the shape design, e.g., a first curve part and a second curve part are provided at the chuck wall part; and the relationship between a radius of curvature of the first curve part and a radius of curvature of the second curve part is regulated. No strict study on the plate thickness has been conducted. - The present invention has been proposed in order to address such a problem. It is an object of the present invention to provide a can lid with a high pressure resistance while meeting a demand for a smaller plate thickness on the basis of a stricter study on the plate thickness, or the like.
- In order to solve such a problem, a can lid in accordance with the present invention includes the following configuration.
- A can lid having a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part, characterized in that t2 > t1 holds, where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.
- A can lid having such a feature can provide the can lid with a high pressure resistance while meeting a demand of more reducing a plate thickness, and can attain an improvement of the pressure resistance at the can lid.
-
- [
Fig. 1] Fig. 1 is an explanatory view showing a partial cross section of a can lid. - [
Fig. 2 ]
Fig. 2 is an explanatory view showing a manufacturing process of a can lid. - [
Fig. 3 ]
Fig. 3 is an explanatory view showing a shape body in the manufacturing process (Fig. 3 at (a) is a shape body shaped by step S1 to step S3,Fig. 3 at (b) and (c) each is a shape body shaped by step S4, andFig. 3 at(d) is a can lid finally obtainable). - [
Fig. 4 ]
Fig. 4 is an explanatory view showing a blank stamping step (Fig. 4 at (a) is before stamping, andFig. 4 at (b) is after stamping). - [
Fig. 5 ]
Fig. 5 is an explanatory view of an outer circumferential part drawing step (Fig. 5 at (a) is during drawing, andFig. 5 at (b) is drawing completed). - [
Fig. 6 ]
Fig. 6 is an explanatory view of a panel part drawing step (Fig. 6 at (a) is at the time of start of drawing, andFig. 6 at (b) is at the time of completion of drawing). - [
Fig. 7 ]
Fig. 7 is an explanatory view of a panel part pressing down step (Fig. 7 at (a) is at the time of start of pressing down, andFig. 7 at (b) is during pressing down). - [
Fig. 8 ]
Fig. 8 is an explanatory view of a panel part pressing down step (Fig. 8 at (a) is pressing down completed, andFig. 8 at (b) is shaped product extraction). - [
Fig. 9 ]
Fig. 9 is an explanatory view showing an example of addition of ironing at the panel part drawing step. - [
Fig. 10 ]
Fig. 10 is an explanatory view showing an example of another shape of an embodiment of the present invention. - [
Fig. 11 ]
Fig. 11 is a view showing the measurement position of a plate thickness of the middle part of the chuck wall part (Fig. 11 at (a) is a view showing the measurement position of another embodiment ofFig. 10 , andFig. 11 at (b) is a view showing the measurement position of an embodiment. - Below, embodiments of the present invention will be described by reference to the accompanying drawings. In the following description, the same reference numerals and signs in different drawings show the sites having the same function, and an overlapping description in respective drawings will be appropriately omitted.
- As shown in
Fig. 1 , a can lid 1 in accordance with an embodiment of the present invention has acenter panel part 1A, apanel wall part 1B, a chuckwall radius part 1C, achuck wall part 1D, and acurl part 1E. Thecenter panel part 1A is a generally flat portion of a central portion of thecan lid 1, and is provided with a score or an opening tab in a case of a stay-on type. - At an outer edge of the
center panel part 1A, there is a curve portion r1. A portion extending downward linearly from a terminal of the curve portion r1 is thepanel wall part 1B. Then, a portion which is a curve portion r2 to be shaped under thepanel wall part 1B, and includes the bottom of an annular groove part Cs to be shaped at an outer circumference of thecenter panel part 1A is the chuckwall radius part 1C. Further, a linear or partially curved potion extending upward from an outer upper end of the chuckwall radius part 1C, a portion from an outer wall of the annular groove part Cs further to a front of a curve of thecurl part 1E, is thechuck wall part 1D. - Then, in the
can lid 1 in accordance with an embodiment of the present invention, t2 > t1 holds, where t1 represents a plate thickness of thecenter panel part 1A, and t2 represents a plate thickness of a bottom end of thepanel wall part 1B. The plate thickness t1 of thecenter panel part 1A is a value close to an original plate thickness of a material to be processed before shape processing of thecan lid 1. - The bottom end of the
panel wall part 1B is a boundary portion between the chuckwall radius part 1C and the curve portion r2. For thecan lid 1, by adopting a novel method for shape processing of the chuckwall radius part 1C, the plate thickness t2 of the bottom end of thepanel wall part 1B is made larger than the plate thickness t1. This enables thecan lid 1 with a still higher pressure resistance in addition to a conventional shape design. By making the plate thickness t2 larger than 1.01 times the plate thickness t1 (t2 > 1.01 * t1), it is possible to obtain acan lid 1 with a still higher pressure resistance. - Further, for the
can lid 1, by making a plate thickness t3, where t3 represents a plate thickness of the chuckwall radius part 1C, larger than the plate thickness t1, and preferably making the plate thickness t3 larger than 1.01 times the plate thickness t1 (t3 > 1.01 * t1), it is possible to obtain acan lid 1 with a high pressure resistance. - Further, for the
can lid 1, t1 > t4 holds, where t4 represents a plate thickness of a middle part of thechuck wall part 1D, namely, a plate thickness at a position one half a substantial height of the can lid as shown inFig. 1 . Accordingly, by making the middle part of thechuck wall part 1D thin, relatively less affected by a pressure resistance, it is possible to reduce a weight of thecan lid 1 while keeping a prescribed pressure resistance. - For the
can lid 1, by partially increasing the plate thicknesses of thepanel wall part 1B and the chuckwall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of thecenter panel part 1A, it is possible to further increase a pressure resistance in addition to the rationalization of the conventional shape design of the annular groove part Cs and the portion extending therefrom to thecurl part 1E. - For the
can lid 1, the plate thicknesses of thepanel wall part 1B and the chuckwall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of thecenter panel part 1A can be made larger than the original plate thickness of the material to be processed (the plate thickness t1 of thecenter panel part 1A). For this reason, it becomes possible to reduce the original plate thickness of the material to be processed as much as possible, so that saving of material resources and weight reduction can be effectively implemented. - Below, a manufacturing method of the
can lid 1 will be described. The manufacturing process of thecan lid 1 has a blank stamping step S1, an outer circumferential part drawing step S2, a panel part drawing step S3, and a panel part pressing down step S4 as shown inFig. 2 . - In the steps, a shape body M1 shown in
Fig. 3 at (a) is shaped by the step S1 to the step S3, and in the step S4, the shape body M1 is subjected to press down processing of a panel part p (a processed part to be processed into thecenter panel part 1A). As a result, shape bodies M2 and M3 shown inFig. 3 at (b) and (c) are shaped, finally resulting in thecan lid 1 shown inFig. 3 at (d). - Each step will be specifically described below. In each step, an upper tool U and a lower tool L shown in
Figs. 4 to 8 are used as process tools. The upper tool U includes an inner tool U1 and an outer tool U2. The lower tool L includes a fixed inner tool L1, a movable inner tool L2, a movable outer tool L3, and a fixed outer tool L4. - In the blank stamping step S1, as shown in
Fig. 4 at (a), a material to be processed M is inserted into between the upper tool U and the lower tool L. As shown inFig. 4 at (b), stamping by a processing surface a of the outer tool U2 and a processing surface b of the fixed outer tool L4 due to descent of the upper tool U shapes a shape body M01 in a disk shape. - At the outer circumferential part drawing step S2, further, the upper tool U descends. As a result, as shown in
Fig. 5 at (a), a lower surface c of the outer tool U2 and an upper surface d of the movable outer tool L3 sandwich an outer circumferential part of a shape body M02. Thus, the outer circumferential part of the shape body M02 is subjected to drawing processing by a processing surface e of the movable inner tool L2. Further, descent of the upper tool U causes the lower surface c of the outer tool U2 to press down the movable outer tool L3, so that a drawing processing on a shape body M03 progresses by a processing surface f of the outer tool U2 and a processing surface g of the movable inner tool L2 as shown inFig. 5 at (b). - At the panel part drawing step S3, as shown in
Fig. 6 at (a), the upper tool U descends further. As a result, a processing surface h of the outer tool U2 and the processing surface e of the movable inner tool L2 sandwich an outer circumferential part of a shape body M04. Thus, a panel part p of the shape body M04 touches an upper surface of the fixed inner tool L1. Accordingly, drawing processing of the panel part p is performed. Then, in this state, as shown inFig. 6 at (b), the upper tool U descends further, so that with an outer circumferential part of a shape body M05 being sandwiched, the movable inner tool L2 is pressed down. Simultaneously, a lower surface of the inner tool U1 and the upper surface of the fixed inner tool L1 sandwich the panel part p. Accordingly, drawing processing of the panel part p progresses. - Then, at the panel part pressing down step S4, as shown in
Fig. 7 at (a), with an outer circumferential part of a shape body M06 being sandwiched between the processing surface e and the processing surface h, the movable inner tool L2 presses up the outer tool U2. As a result, as shown inFig. 7 at (b), the panel part p of the shape body M06 is relatively pressed down with respect to the outer circumferential part, so that a shape body M07 is shaped. - Then, as shown in
Fig. 8 at (a), relative pressing down of the panel part p is further progressed. As a result, a processed part to be processed into the chuckwall radius part 1C between the panel part p and an outer circumferential part of a shape body M08 is forced into a groove part j provided between the fixed inner tool U2 and the movable inner tool L2. As a result of this, the panelwarm part 1B and the chuckwall radius part 1C are shaped. Further, due to the relative pressing down of the panel part p, thecurl part 1E is shaped into an outer circumferential part sandwiched between the processing surface e and the processing surface h. Furthermore, thecenter panel part 1A is shaped in the panel part p sandwiched between the lower surface of the inner tool U1 and the upper surface of the fixed inner tool L1. Subsequently, as shown inFig. 8 at (b), the upper tool U and the lower tool L are disengaged, and a shaped product of thecan lid 1 is taken out. - Subsequently, although not shown, the outermost circumferential part of the shaped product of the
can lid 1 is curled into a shape suitable for seaming by a known method, and a sealing compound is applied to an inner surface portion thereof. Further, according to the intended purpose, the panel part is subjected to a step such as rivet processing, score processing, or caulking of a tab, resulting in completion of a can lid. - With the manufacturing process, the
panel wall part 1B and the chuckwall radius part 1C are shaped by pressing down the panel part p which is the processed part to be processed into thecenter panel part 1A and the processed part to be processed into the chuckwall radius part 1C is forced into the groove part j. For this reason, a shape process is accomplished without direct touch between the processing surface of the process tool and thepanel wall part 1B and the chuckwall radius part 1C. Further, pressing down of the panel part p causes the processed parts to be processed into thepanel wall part 1B and the chuckwall radius part 1C to be applied with a compression stress in a direction orthogonal to a plate thickness direction. Accordingly, such plastic deformation as to result in an increase in plate thickness is performed. - Further, as a process tool, as shown in
Fig. 9 , a die obtained by providing a fixed inner tool L10 with an ironing convex part k1 is used. Then, the shape body is ironed between an inner processing surface k2 of the outer tool U2 of the upper tool U and the ironing convex part k1. As a result, at the panel part drawing step S3, ironing can be added to the middle part of thechuck wall part 1D. Thus, when ironing is added to a part (particularly, a central part) of thechuck wall part 1D, a plate thickness of a part of thechuck wall part 1D can be reduced. As a result of this, it is possible to effectively enhance the pressure resistance of thecan lid 1 while satisfying a demand for saving material resources and reduction of the weight. - Incidentally, the manufacturing process is a method for performing from blank stamping to the shaped product of the
can lid 1 by one stroke in upper and lower dies. However, the series of steps can also be performed in a plurality of stages using different dies. Particularly, an action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p in the panel part pressing down step S4 is maximized in a state depicted inFig. 8 at (a), namely, in a state in which the processed part is forced into the bottom of the groove part j. For this reason, a following control becomes possible: panel pressing down is divided into a plurality of stages; and at each stage, the panel pressing down is performed with the die including the groove bottom; as a result, the region to be increased in plate thickness is allowed to be wider. - Using a coil coat material obtained by coating an Al alloy (A5182-H19) with a plate thickness of 0.26 mm with an outer surface paint in an amount of 15 mg/dm2 and an inner surface paint in an amount of 100 mg/dm2 as a to-be-processed material M, the
can lid 1 was shaped with the manufacturing process. Thus, a plate thickness of each part was measured. The example is shown in Table 1 below. Incidentally, t5 is a plate thickness of the upper end of thepanel wall part 1B. Herein, shaping was performed in the same manner as in Example 1, except that the middle part of thechuck wall part 1D was subjected to ironing at an ironing ratio of about 7% with an outer diameter of the fixed inner tool L1 Φh = 51.58 mm for Example 1, Φh = 52.18 mm for Example 2, and Φh = 51.58 mm for Example 3.[Table 1] Plate thickness site t1 t2 t3 t4 t5 Pressure resistance (MPa) Example 1 0.260 0.290 0.271 0.275 0.280 0.752 Example 2 0.260 0.302 0.279 0.285 0.291 0.766 Example 3 0.260 0.307 0.282 0.256 0.301 0.777 Comparative Example 0.260 0.242 - 0.258 0.240 0.691 - As shown in Table 1, in Example 1, the plate thickness t2 is larger than 1.01 times the plate thickness t1. In Example 2, the plate thickness t2 and the plate thickness t3 are larger than 1.01 times the plate thickness t1. Further, in Example 3, the plate thickness t4 is reduced by ironing, so that the metal portion of the processed part to be processed into the
panel wall 1B and the chuckwall radius part 1C can be allocated as that much. As a result, the action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p can further increase the plate thicknesses t2 and t3. Such adjustment of the plate thickness could increase the pressure resistance as compared with Comparative Example accomplished by the conventional method inPTL 2. - As described up to this point, for the
can lid 1 in accordance with the embodiment of the present invention, it is possible to obtain thecan lid 1 with a high pressure resistance while satisfying a demand for more reducing the plate thickness, and it becomes possible to improve the pressure resistance in thecan lid 1. Canned goods obtained by seaming thecan lid 1 to the can barrel can reduce a weight of a metal can relative to a content weight while ensuring the high pressure resistance. - Up to this point, the embodiments of the present invention were described by reference to the accompanying drawings. However, the specific configuration is not limited to the embodiments, and even changes or the like of the design within the scope not departing from the gist of the present invention are included in the present invention. Further, the respective embodiments can be combined by applying mutual technologies unless there are particularly inconsistencies and problems. For example, to the
can lid 1 having the cross sectional shape as inFig. 10 described inPTL 1, the combination of the present invention can be applied. -
Fig. 11 is a view showing the measurement position of the plate thickness of the middle part of the chuck wall part, whereFig. 11 at (a) is a view showing the measurement position of another embodiment ofFig. 10 , andFig. 11 at (b) is a view showing the measurement position of an embodiment. - In either case of
Fig. 11 at (a) and (b), for thecan lid 1, t1 > t4 holds, where t4 represents the plate thickness of the middle part of thechuck wall part 1D, namely, the plate thickness at the position at a height one half the substantial height of the can lid. Also in another embodiment, by making thin the middle part of thechuck wall part 1D relatively less affected by the pressure resistance, it is possible to reduce the weight of thecan lid 1 while keeping a prescribed pressure resistance. - Incidentally, the other embodiment of
Fig. 11 at (a) and the embodiment ofFig. 11 at (b) show partial cross sections after seaming the portion of thecan lid 1 ofFig. 10 and the portion of thecan lid 1 ofFig. 1 to their can barrels, respectively. Even the comparison between state ofFigs. 10 and1 before seaming and states ofFig. 11 after seaming does not indicate a change in substantial height between before and after seaming of thecan lid 1. Accordingly, the plate thicknesses t4 of the other embodimentFig. 11 at (a) and the embodimentFig. 11 at (b) are roughly at the same position. -
- 1
- Can lid
- 1A
- Center panel part
- 1B
- Panel wall part
- 1C
- Chuck wall radius part
- 1D
- Chuck wall part
- 1E
- Curl part
- U
- Upper tool
- L
- Lower tool
- p
- Panel part
Claims (7)
- A can lid having a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part,wherein t2 > t1 holds,where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.
- The can lid according to claim 1,wherein t2 > 1.01 * t1 holds,where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.
- The can lid according to claim 1 or 2,wherein t3 > 1.01 * t1 holds,where t3 represents a plate thickness of the chuck wall radius part.
- The can lid according to any one of claims 1 to 3,wherein t1 > t4 holds,where t4 represents a plate thickness of a middle part of the chuck wall part.
- Canned goods using the can lid according to any one of claims 1 to 4.
- A manufacturing method for the can lid according to any one of claims 1 to 4,
wherein the chuck wall radius part is shaped by relatively pressing down a processed part to be processed into the center panel part. - The manufacturing method for the can lid according to claim 6,
wherein ironing is added to a part of the chuck wall part.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020119375A JP2022016093A (en) | 2020-07-10 | 2020-07-10 | Can lid and manufacturing method thereof |
PCT/JP2021/021682 WO2022009585A1 (en) | 2020-07-10 | 2021-06-08 | Can lid and manufacturing method therefor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4180349A1 true EP4180349A1 (en) | 2023-05-17 |
EP4180349A4 EP4180349A4 (en) | 2024-06-26 |
Family
ID=79552418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21838754.6A Pending EP4180349A4 (en) | 2020-07-10 | 2021-06-08 | Can lid and manufacturing method therefor |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230256500A1 (en) |
EP (1) | EP4180349A4 (en) |
JP (1) | JP2022016093A (en) |
CN (1) | CN115768694A (en) |
TW (1) | TW202216543A (en) |
WO (1) | WO2022009585A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03275443A (en) | 1990-03-10 | 1991-12-06 | Toyo Seikan Kaisha Ltd | Manufacture of lid for use on pressure proof can and the same lid |
JP5956341B2 (en) | 2010-09-22 | 2016-07-27 | ユニバーサル製缶株式会社 | Can lid |
US9573183B2 (en) * | 2012-05-18 | 2017-02-21 | Stolle Machinery Company, Llc | Container, and selectively formed shell, and tooling and associated method for providing same |
JP6988136B2 (en) * | 2017-04-03 | 2022-01-05 | 東洋製罐株式会社 | How to make a shell and how to make a can lid |
-
2020
- 2020-07-10 JP JP2020119375A patent/JP2022016093A/en active Pending
-
2021
- 2021-06-08 CN CN202180047850.5A patent/CN115768694A/en active Pending
- 2021-06-08 WO PCT/JP2021/021682 patent/WO2022009585A1/en unknown
- 2021-06-08 US US18/014,950 patent/US20230256500A1/en active Pending
- 2021-06-08 EP EP21838754.6A patent/EP4180349A4/en active Pending
- 2021-06-30 TW TW110124016A patent/TW202216543A/en unknown
Also Published As
Publication number | Publication date |
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TW202216543A (en) | 2022-05-01 |
WO2022009585A1 (en) | 2022-01-13 |
CN115768694A (en) | 2023-03-07 |
JP2022016093A (en) | 2022-01-21 |
US20230256500A1 (en) | 2023-08-17 |
EP4180349A4 (en) | 2024-06-26 |
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