WO2010150649A1 - 筒型容器とその製造方法 - Google Patents

筒型容器とその製造方法 Download PDF

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Publication number
WO2010150649A1
WO2010150649A1 PCT/JP2010/059672 JP2010059672W WO2010150649A1 WO 2010150649 A1 WO2010150649 A1 WO 2010150649A1 JP 2010059672 W JP2010059672 W JP 2010059672W WO 2010150649 A1 WO2010150649 A1 WO 2010150649A1
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WO
WIPO (PCT)
Prior art keywords
side wall
cylindrical container
sealing portion
sealing
main body
Prior art date
Application number
PCT/JP2010/059672
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English (en)
French (fr)
Japanese (ja)
Inventor
然朗 白根
真一 明瀬
Original Assignee
東洋製罐株式会社
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Filing date
Publication date
Application filed by 東洋製罐株式会社 filed Critical 東洋製罐株式会社
Publication of WO2010150649A1 publication Critical patent/WO2010150649A1/ja

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a cylindrical container and a manufacturing method thereof, and more particularly to a cylindrical container suitable for a battery can and a manufacturing method thereof.
  • the outer layer can of a battery has been obtained by drawing and squeezing and molding a cup obtained by drawing an iron-based substrate with a die and a punch.
  • a small and lightweight battery can for high energy density and high sealing batteries such as ion batteries For this reason, the side wall is required to be thinner.
  • the strength of the side wall in the vicinity of the opening end hereinafter referred to as the sealing portion
  • the sealing portion becomes weak, and sufficient sealing strength is obtained. There is a problem that it becomes impossible.
  • the sealing part of the trunk side wall is made the side wall main part (
  • a battery can that is thicker inward than the portion of the body side wall excluding the sealing portion is referred to as a side wall main body portion to ensure the strength of the sealing portion is proposed (for example, (See Patent Documents 1 and 2).
  • the inner diameter of the side wall of the body portion is small in the sealing portion and large in the side wall main body portion, so that when the electrode plate or the like is stored in the battery can, it contacts the sealing portion.
  • the size of the contents to be accommodated in the can is restricted by the diameter of the sealing portion, and thus there is a problem of reducing the volume ratio. Therefore, in order to solve the problem, a battery can that has a thick wall portion of the sealing portion that is convex toward the outside and has the same inside diameter until reaching the bottom wall from the sealing portion and is straight in the axial direction. It has been proposed (see Patent Document 3).
  • the method for manufacturing a battery can proposed in Patent Document 3 is to obtain a can body in which the sealing portion of the side wall becomes thicker toward the inside by the method shown in the cited documents 1 and 2, and the can Further, the body is further expanded toward the inner side of the sealing portion by expanding the sealing portion with a tube expansion punch having a convex portion having the same diameter as the inner diameter of the side wall body portion which is a thin-walled portion. Is changed to a convex thick wall state toward the outside, and is manufactured through a process of processing so that the inner diameter becomes the same size from the sealing portion to the bottom wall.
  • the manufacturing process further requires a pipe expansion process using a pipe expansion punch, and there is a problem that the manufacturing efficiency is reduced and additional equipment is required and the equipment cost is increased.
  • a tube expansion punch having a convex portion on the outer peripheral portion is inserted into a can body formed by drawing and ironing, and an axial load is applied, so that the convex portion on the inside of the can body is directed outward.
  • the present invention is to solve the above problems, and in a can body formed by drawing and ironing, while ensuring sufficient sealing strength of the sealing portion, further reducing the thickness of the side wall main body portion.
  • the inner peripheral surface of the sealing portion can secure an inner peripheral surface that is substantially the same diameter as the inner peripheral surface of the side wall body portion, making it easy to store contents and increasing the volume ratio.
  • An object of the present invention is to provide a cylindrical container capable of producing a can suitable for a battery can and the like, and a method for producing the same without the need for any process or equipment.
  • the inventor made the sealing part project inward by drawing and squeezing to form a thickness from the side wall body part.
  • molding is performed by adding axial load with a tube expansion punch in the conventional post-process. Instead, if it can be achieved without adding an axial load, the side wall main body will not be buckled due to the processing, making it possible to make it thinner, and the miniaturization (thin wall thickness) that has become particularly demanding for battery cans in recent years.
  • the side wall body part molding surface which is the large diameter part of the punch, is formed after stripping after drawing ironing.
  • the thick portion is formed within the elastically deformable range of the sealing portion. That is, at the time of stripping, tube expansion is applied to the sealing portion.
  • the tube expansion rate is too large, fractures such as cracks occur.
  • tube expansion processing exceeding the elastic range is possible.
  • the cylindrical container of the present invention is a cylindrical container whose base material formed by the drawing ironing method, the can body side wall is composed of a side wall body part and a sealing part, and the inner periphery of the can body side wall
  • the side wall main body Assuming that the inner diameter is D, the elastic limit elongation during expansion of the sealing portion is ⁇ , and the molding limit elongation is ⁇ , the difference between the thickness Tf of the sealing portion and the thickness Tw of the side wall main body is expressed by the following equation: ⁇ D / ⁇ 2 ( ⁇ + 1) ⁇ ⁇ (Tf ⁇ Tw) ⁇ ⁇ ⁇ D / ⁇ 2 ( ⁇ + 1) ⁇ (1) It is characterized by having a relationship that satisfies
  • the sealing is not performed by post-processing but only by the pipe expanding action by the punch at the time of stripping after drawing and ironing.
  • the portion is plastically deformed without causing cracks, and the expanded tube is maintained in a convex state outward by the maximum Tf-Tw amount, so that a cylindrical container having a light weight, an improved volume ratio, and a uniform inner diameter can be obtained.
  • the base material of the cylindrical container of the present invention is not limited to iron, and any metal material such as aluminum, copper, or an alloy thereof, or a film-treated one such as plating can be used as necessary.
  • a Ni-plated steel plate can be suitably employed as a base material.
  • the cylindrical container of this invention is applicable not only to a battery can but to a drink can and a container for other uses.
  • the cylindrical container according to the present invention basically has a side wall main body having a diameter of 13 to 40 mm.
  • the sealing portion thickness Tf and the side wall main body thickness Tw The difference is 0.1 mm ⁇ Tf ⁇ Tw ⁇ 0.5 mm, the inner diameter is substantially straight, and the sealing portion can be configured as a battery can with a plate thickness increasing toward the outside.
  • the sealing portion when (Tf ⁇ Tw) /Tf ⁇ 0.5, the sealing portion has a one-step step toward the outside, and when (Tf ⁇ Tw) / Tf> 0.5,
  • the sealing portion is preferably a two-step step toward the outside.
  • (Tf ⁇ Tw) /Tf ⁇ 0.5 good molding can be achieved even with a single step, but when (Tf ⁇ Tw) / Tf> 0.5, the ironing rate is limited and the ironing rate is limited. Since there is a risk that the cylinder will be broken beyond the maximum, the maximum squeezing rate can be reduced by forming a two-step step, a cylindrical container that can be molded more easily and the side wall body can be made thinner can be realized. .
  • the method for manufacturing a cylindrical container according to the present invention for manufacturing the cylindrical container is a method for forming a cylindrical container in which a base metal is formed by drawing and squeezing a cup, and the cup is squeezed.
  • the processing outer peripheral surface of the punch for ironing includes a side wall main body molding surface and a sealing portion molding surface, and the outer diameter of the side wall main body molding surface is larger than the outer diameter of the sealing portion molding surface, and A connecting portion between the side wall main body molding surface and the sealing portion molding surface is formed in a tapered step surface, and the cup is squeezed and ironed with the punch and the die, and the side wall main body and the side wall main body above Forming a cylindrical container intermediate body having a sealing portion that protrudes inwardly from the inner peripheral surface through a tapered step surface, and at the time of stripping, the sealing portion of the cylindrical container intermediate body is formed by the punch.
  • the expansion rate is greater than the elastic limit elongation.
  • the outer diameter Db of the sealing portion molding surface is the side wall body portion molding surface. It can achieve more reliably by having the following relationship with respect to the outer diameter Da. ⁇ Da / (1 + ⁇ ) ⁇ ⁇ Db ⁇ ⁇ Da / (1 + ⁇ ) ⁇
  • ⁇ is the elastic limit elongation rate at the time of tube expansion of the sealing portion of the cylindrical container intermediate body
  • ⁇ is the molding limit elongation rate
  • Da is equal to the inner diameter D of the cylindrical container to be molded.
  • the cylindrical container of the present invention in the cylindrical container formed by squeezing and squeezing, it is possible to further reduce the thickness of the side wall body while ensuring sufficient sealing strength of the sealing part.
  • the inner peripheral surface of the sealing portion can secure an inner peripheral surface that is substantially the same diameter as the inner peripheral surface of the side wall body portion, the contents can be easily stored and the volume ratio can be increased, and the manufacturing is also easy and special.
  • a cylindrical container suitable for a battery can or the like can be obtained without requiring a simple process or equipment.
  • the sealing part is directly plastically deformed outward in the stripping step after squeezing and squeezing, for the conventional expansion of the sealing part.
  • a tube expansion process using a tube expansion punch Therefore, the process can be simplified without requiring an extra process, and a compressive load does not act on the side wall main body for expanding the pipe, so that the side wall main body can be made thinner, and the thickness is further reduced.
  • a cylindrical container such as a battery can having a small volume ratio and an excellent sealing property can be obtained.
  • FIG. 1 It is front sectional drawing of the cylindrical container which concerns on embodiment of this invention.
  • FIG. 1 (A)-(d) is sectional drawing which shows the manufacturing process (drawing and squeezing process) to the cylindrical container intermediate body of the cylindrical container which concerns on embodiment of this invention.
  • FIG. 1 (A) to (c) are cross-sectional views showing a process (stripping process) for obtaining a cylindrical container from the cylindrical container intermediate body following the process of FIG.
  • FIG. (A) to (c) are sectional views showing a step (stripping step) for obtaining a cylindrical container from the cylindrical container intermediate body following the step of FIG.
  • FIG. 1 is a schematic cross-sectional view of a cylindrical container 1 according to an embodiment of the present invention, which is obtained by drawing and ironing, which will be described later, using a nickel-plated steel plate as a base material. It consists of a partial side wall 3 and is a cylindrical container having an open upper end, which is formed as a battery can in this embodiment.
  • the body side wall 3 includes a side wall main body 4 having a thickness of Tw and a sealing portion 5 having a thickness of Tf, and the inner peripheral surface is substantially straight from the opening end to the bottom wall 2.
  • the surface is a thick portion with the sealing portion 5 projecting outward, and a tapered surface 6 is formed between the thin wall side body portion.
  • the cylindrical container of this embodiment has a diameter in the range of 13 mm to 40 mm, and can be used as an outer can of a primary battery or a secondary battery.
  • the cylindrical container of the present embodiment into the shape as described above, it is possible to facilitate the insertion of the interior parts such as the electrode plate into the battery can and increase the volume ratio, and the side wall main body portion is thin. Even so, a can that maintains the strength of the sealing portion can be obtained.
  • the thickness Tw and the sealed portion of the side wall main body as shown below A sealing portion satisfying a certain condition with respect to the plate thickness Tf is obtained by squeezing and squeezing a cylindrical container intermediate body that is convex inward, and applying plastic deformation to the sealing portion at the time of stripping the punch, It was easy to get.
  • the relationship between the plate thickness Tw of the side wall body portion and the plate thickness Tf of the side wall of the sealing portion is such that the expansion ratio of the sealing portion by stripping after the drawing and squeezing step described later causes plastic deformation exceeding the elastic deformation range, and It is important to be within the molding limit elongation range of the sealing portion. If the expansion ratio is within the elastic limit range, the sealing portion returns to the inside by the spring back after stripping, and the convex state in the inward direction cannot be eliminated. Therefore, it is desirable that the expansion of the sealing portion by stripping is more than elastic deformation, and it is desirable that the ratio of plastic deformation is large, and by completely plastic deformation, a can whose inner peripheral surface is completely straight in the axial direction can be obtained. Although desirable, some springback will inevitably remain.
  • the first condition is that the expansion rate by stripping of the sealing portion exceeds the elastic deformation region, that is, exceeds the elastic limit elongation rate ⁇
  • the second condition is The tube expansion rate does not exceed the molding limit elongation ⁇ during tube expansion.
  • Tf ⁇ Tw Tf ⁇ Tw
  • the return rate due to elastic deformation after the end of stripping increases as the value of (Tf ⁇ Tw) approaches the left side value, and the plastic deformation rate increases as it approaches the right side value.
  • the elastic limit elongation rate ⁇ and the molding limit elongation rate ⁇ differ depending on the material, the diameter of the can body, and the like.
  • the elastic limit elongation rate ⁇ and the molding limit elongation rate ⁇ differ depending on the material, the diameter of the can body, and the like.
  • it is about 0.2. % Elastic recovery occurs. Therefore, in order to obtain a clear permanent deformation, it is necessary to give a strain with a processing rate of 0.2% or more at a minimum. In this case, it is assumed that a deformation of about 0.5% is given. That is, the elastic limit elongation ⁇ is set to 0.5%.
  • the can body after drawing and ironing is severely work-hardened and can only obtain an elongation of about 2-3% at most.
  • the molding limit elongation ⁇ was set to 2.5% for safety. If the forming limit elongation ⁇ is 2.5%, when the can body diameter D is 40 mm, the forming limit elongation is not exceeded as long as it is within the range of (Tf ⁇ Tw) ⁇ 0.5 mm according to the above formula 1. It is possible to plastically deform the sealing portion. On the other hand, in order to give plastic deformation to the sealing portion, 0.1 ⁇ (Tf ⁇ Tw) must be satisfied. Therefore, 0.1 mm ⁇ (Tf ⁇ Tw) ⁇ 0.5 mm is required in order to cause the sealing portion to be plastically deformed outwardly without exceeding the molding limit.
  • FIG. 2 is a schematic diagram of the drawing and ironing process
  • FIG. 3 is a schematic diagram of the stripping process after the drawing and ironing process.
  • FIG. 2 shows a cross section of the punch 20 and the cup 10
  • (b) shows the first ironing step
  • (c) shows the second ironing step
  • (d) shows the state after the ironing process is finished. It is shown as a cross section for each process.
  • the punch 20 used in this embodiment for ironing has a large-diameter side wall main body molding surface 21 and a smaller sealing portion molding surface 22, and the side wall main body molding surface 21 and the sealing portion molding.
  • a step between the surface 22 and the tapered surface 23 is formed.
  • Tf is the plate thickness of the sealing part 5 of the target cylindrical container shown in FIG. 1
  • Tw is the plate thickness of the side wall body 4. That is, the radius of the side wall body portion molding surface 21 of the punch is larger than the sealing portion forming surface by an amount corresponding to the difference between the thickness of the sealing portion and the thickness of the side wall body portion.
  • Tf ⁇ Tw is the amount of expansion of the sealing portion, as will be described later, and is set in a range where the amount of expansion exceeds the elastic deformation region and reaches the plastic deformation region and does not exceed the forming limit elongation.
  • the cup 10 obtained by drawing from the base material of the metal plate in the previous process is ironed by a die (not shown) and the punch 20, but in this embodiment, the dies having different inner diameters are used. Are arranged in two stages, and ironing is performed in two stages.
  • the portion formed by the primary ironing process for the dimensions of the cylindrical container is attached with a subscript 1, and similarly to the part formed by the secondary ironing process and the third ironing process. Are given subscripts 2 and 3, respectively. And the subscript is not attached
  • the thickness of the peripheral wall 12 is set to Tw 1 by the first stage die and the side wall body molding surface 21 of the punch 20 for the cup 10 having the thickness Td of the peripheral wall 12 and the thickness To of the bottom wall 11.
  • the first ironing is performed.
  • the side wall main body portion molding surface 21 to form a side wall main body portion 4 2 of the thickness Tw 2
  • sealing portion forming a small diameter portion of the punch portion pressed against the surface 22 is the sealing portion 5 2 of thickness Tf 2 is formed.
  • FIG. 3 when the punch 20 is returned from this state, stripping is performed, but the upward movement of the cylindrical container intermediate body 15 is restricted by a stripper claw (not shown). by only moves upward (omission direction), is pipe expanding expanded portion 5 2 of the inner part of the convex cylindrical container intermediate 15 is pressed against the tapered surface 23 of the punch, and FIG. 3 (b) gradually material sealing portion 5 2, as shown in moves outward, is changed to a state in which a convex outward by a thickness of (Tf 2 -Tw 2).
  • the sealing portion since the expansion of the sealing portion by the punch at the time of stripping is performed within the range of the elastic limit elongation rate and the molding limit elongation rate, ideally the sealing portion even if stripping is completed. Does not return to its original state due to plastic deformation, and as shown in FIG. 3 (c), the side wall plate of the body portion whose inner peripheral surface is substantially straight and whose sealing portion is convex toward the outside.
  • the punch 20 For sealing portion 5 2 of the cylindrical vessel Intermediate 15 during the above stripping without generating and cracking plastic deformation, forming a cylindrical container such as better shown in Figure 1, the punch 20 The shape must meet the following conditions: That is, in the state of (a) 3, by the punch is increased, since the sealing portion 5 2 of the cylindrical vessel intermediates undergo tube expansion action until the inner diameter is D, the expansion ratio is 2 (Tf 2 - Tw 2 ) / ⁇ D ⁇ 2 (Tf 2 ⁇ Tw 2 ) ⁇ ⁇ 100.
  • the diameter Db of the punch sealing part forming surface is ⁇ Da / (1 + ⁇ ) ⁇ ⁇ Db ⁇ ⁇ Da / (1 + ⁇ ) ⁇ must be satisfied.
  • Da is equal to the inner diameter D of the obtained cylindrical container. It is defined by ⁇ D / (1 + ⁇ ) ⁇ ⁇ Db ⁇ ⁇ D / (1 + ⁇ ) ⁇ .
  • FIG. 4 shows a cylindrical container 30 according to another embodiment of the present invention.
  • the plate thickness of the sealing portion 5 is formed to be thick with a one-step convex step outward.
  • the sealing portion 35 is formed in two steps with 35a and 35b, whereby the maximum ironing rate can be reduced and the wall of the trunk portion can be made thinner.
  • the step between the sealing portion and the side wall body may be a single step, but a two-step is preferable if (Tfb ⁇ Tw) / Tfb> 0.5.
  • the maximum ironing rate can be reduced to 50% or less, and good molding can be performed.
  • the side wall body can be made thin by making the sealing portion into two steps. Therefore, in this case, when the thickness of the side wall body portion of the cylindrical container is Tw and the thickness of the sealing portion is Tf, the punch sealing portion is formed when (Tf ⁇ Tw) /Tf ⁇ 0.5.
  • the surface is formed to be smaller in diameter by one step than the side wall body forming surface, and when (Tf ⁇ Tw) / Tf> 0.5, the surface is formed to be smaller in diameter by two steps.
  • the ironing rate should be within 50%.
  • FIG. 5 shows a process of obtaining the cylindrical container intermediate 37 by ironing in the manufacturing process of the cylindrical container 30 in which the sealing portion is formed in two steps.
  • the punch 40 has a sealing portion molding surface 42 formed at the upper end of the side wall main body molding surface 41 having an outer diameter Da in two stages. That is, a first-stage sealing portion molding surface 42 a having an outer diameter Db ′ is formed from the upper end of the side wall body portion molding surface 41 via the first taper surface 44, and further outwardly via the inclined taper surface 45. A second-stage sealing portion molding surface 42b having a diameter Db is formed.
  • the ironing of the side wall of the drawn cup is performed three times as shown in FIGS. 5 (a) to 5 (c), and the primary ironing is performed until it reaches the middle of the side wall body portion molding surface, The secondary ironing process is performed until reaching the middle of the first-stage sealing portion molding surface 42a, and the third ironing process is performed until the end of the second-stage sealing portion molding surface 42b.
  • the primary ironing is performed until the wall thickness becomes Tw 1 on the side wall body part molding surface, and then the side wall body part molding is performed by secondary ironing.
  • the thickness of the side wall body portion is Tw 2 at the surface, and the sealing portion is formed at the first-stage sealing portion molding surface 42 a until the sealing portion reaches the thickness Tf 2.
  • the first-stage sealing portion molding surface 42 a is the first-stage sealing portion plate thickness Tf 3 ′
  • the second-stage sealing portion molding surface 42 b is the second-stage sealing portion plate thickness Tf 3.
  • the maximum ironing rate in each step is (Td ⁇ Tw 1 ) / Td ⁇ 100 for the first ironing, (Tw 1 ⁇ Tw 2 ) / Tw 1 ⁇ 100 for the second ironing, and (Tw 2 ) for the third ironing.
  • FIG. 6 shows a process of obtaining the cylindrical container 30 shown in FIG. 4 by stripping after the ironing process shown in FIG. 5, but is basically the same as FIG. 3 except that it has two steps. Only the reference numerals are attached, and detailed description is omitted.
  • Example 1 In order to obtain a cylindrical battery container having an outer diameter of 18 mm and a height of 65 mm from a drawn cup made of a Ni-plated steel plate as a base material, As shown in FIG. 5, a cylindrical container intermediate body having a two-step sealing portion and projecting inward was formed using a punch having two steps. The molding conditions at that time are as shown in Table 1.
  • Example 2 In order to obtain a cylindrical battery container having an outer diameter of 32 mm and a height of 120 mm from a drawn cup whose base material is a Ni-plated steel plate, the sealing portion molding surface is formed so as to obtain a cylindrical container intermediate having the same target value. As shown in FIG. 2, a cylindrical container intermediate body having a two-step sealing portion and projecting inward was formed using a punch having a one-step step. The molding conditions at that time are as shown in Table 1.
  • Comparative example In the same manner as in the example, the target is to obtain a cylindrical battery container having an outer diameter of 18 mm and a height of 65 mm from a drawn cup made of a Ni-plated steel plate. After the ironing process, a cylindrical container intermediate body was formed in which the sealing portion had one step on the outside and convex toward the inside. The molding conditions at that time are shown in Table 1 together with Examples 1 and 2.
  • the target sealing portion plate thickness of Example 1 and the comparative example is the same 0.26 mm, but in the comparative example, the sealing portion is formed in a one-step step and is performed by two-step ironing, and in Example 1, the two-step step is performed. This was done by three-stage ironing. As a result, in the comparative example, the maximum ironing rate in the second ironing was 51.9%, exceeding the limit ironing rate, causing a broken body, and a good product could not be obtained. On the other hand, in Example 1, ironing was performed three times with two steps, and as a result, the maximum ironing rate could be reduced to 38.1%, and ironing could be performed satisfactorily without causing breakage.
  • Example 2 in the ironing process of the cylindrical container intermediate body, the tube expansion rate is small and the maximum ironing rate is 50% or less, so that the cylinder breakage occurs in the ironing process twice by the punch of one step. A good cylindrical battery container intermediate was obtained.
  • the punching portion was forcibly removed from the cylindrical container intermediate body after ironing in the stripping process, so that the sealing portion protruding inwardly was displaced outwardly.
  • the inner diameter of the sealing portion has a spring back of about 0.2% with respect to the diameter from the fully expanded state, about 0.04 mm in Example 1, 0.06 mm in Example 2, that is, the inner step is Although it was 0.02 mm in Example 1 and 0.03 mm in Example 2, it is possible to obtain a battery can that is almost aimed without maintaining plastic deformation and without causing cracks. The sex was confirmed.
  • the cylindrical container and the manufacturing method thereof of the present invention it is possible to further reduce the thickness of the side wall main body while ensuring sufficient sealing strength, and the inner peripheral surface of the sealing main body is substantially the same diameter as the inner peripheral surface of the side wall main body.
  • the inner peripheral surface of the sealing main body is substantially the same diameter as the inner peripheral surface of the side wall main body.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
PCT/JP2010/059672 2009-06-24 2010-06-08 筒型容器とその製造方法 WO2010150649A1 (ja)

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WO2022057274A1 (zh) * 2020-09-15 2022-03-24 苏州斯莱克精密设备股份有限公司 一种电池罐罐体拉伸用冲头、模具及其拉伸工艺
US11407022B2 (en) * 2018-02-06 2022-08-09 Tata Steel Ijmuiden B.V. Process and apparatus for the production of a can body by wall ironing

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JP5551560B2 (ja) * 2010-10-07 2014-07-16 Ｆｄｋトワイセル株式会社 円筒形電池
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