JP4908788B2 - Tubular member manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to a tubular member manufacturing method and a manufacturing apparatus characterized by a method of attaching a lid member suitable for sealing an opening by winding.

  A sealed battery is manufactured by inserting a power generation element into a tubular battery can having one end opened, and then sealing the opening with a lid member. As a conventional technique for fixing the lid member to the battery can, there is a method performed by a caulking fixing method (Patent Document 1).

The method of Patent Document 1 is a method in which the outer can opening is bent inward at about 90 degrees using a mold. Sealing materials such as gaskets are used to ensure hermeticity. In the method of Patent Document 1, since a gasket is employed, the number of parts is increased and there is a limit to improvement in workability.
JP 2003-257382 A

  The present invention has been made in view of the above circumstances, and a method for manufacturing a tubular member capable of fixing a lid member to an opening of a tubular member having one end opened, such as a battery can, by a simple method, and its manufacture It is an object to be solved to provide a manufacturing apparatus that can be suitably used in a method.

  (1) In order to solve the above-mentioned problems, the present inventors have intensively studied and, as a result, came up with the idea of adopting winding tightening as a method for fixing the lid member to the opening of the tubular member. A manufacturing method that can be performed by a press-like technique was developed, and the following invention was completed.

(1-1) That is, the manufacturing method of the tubular member of the present invention that solves the above problem employs a method of winding a cylindrical member having at least one end opened and a lid member fixed to the one end. A method of manufacturing a tubular member in which the lid member is fixed to the one end,
The one end portion of the tubular member and the lid member each have a tightening portion having a shape that overlaps and closely adheres at a portion to be tightened,
Superimposing the winding portions of the tubular member and the lid member,
With a mold that makes the push mold movable and the buckling prevention mold fixed,
A winding guide portion that has a cross-sectional shape made of a curve having a shape similar to that of the outer shape after the tightening portion is tightened, and that is disposed substantially along a portion where the one end side of the tightening portion is located. at the press-type having, by the one end to pressed into contact in the winding-out fastening portion in a direction opening the one end side of the overlapped take--out fastening portion along the pusher type the cross-sectional shape winding A winding process to be rotated;
The winding step includes a step of preventing buckling by supporting the tightening portion with the buckling prevention mold. Moreover, as a suitable aspect, it is good that the said cylindrical member opens only one end part.

A winding tightening portion is provided on the tubular member and the lid member, and the tightening is completed by pressing the winding tightening portion with a pressing die from the opening direction. A winding clamping guide portion having a cross-sectional shape corresponding to the cross-sectional shape around which the tightening portion is tightened is provided at a portion of the pressing die that comes into contact with the tightening portion, and one end portion of the tightening portion is pressed by the pressing die. It will bend (wind) along the shape in the winding guide part in order from the side. As the winding tightening portion is sequentially wound by the winding tightening guide portion, one end portion side of the winding tightening portion is wound into a roll having the cross-sectional diameter of the winding tightening guide portion. The number and shape of the tightening can be controlled by changing the length of the tightening portion and the cross-sectional shape of the tightening guide portion. Furthermore, when the pressing die is pressed against the opening , the winding member is supported by the buckling prevention mold so that the tubular member or the like does not buckle , so that the winding can be stably performed.

  Here, the direction in which the tightening portion is wound is determined by the direction of inclination of the portion where the one end portion side of the tightening portion abuts on the tightening guide portion. For example, in the case of coming into contact with one end side of the winding tightening portion in the outer direction of the winding tightening guide portion, the one end portion side of the winding tightening portion is bent inward along with the winding tightening guide portion. On the other hand, when it comes into contact with the one end side of the tightening portion in the inward direction of the tightening guide portion, the one end portion side of the winding tightening portion is bent outward in accordance with the tightening guide portion.

  (1-2) It is desirable that the inner peripheral surface of the tubular member has a reduced diameter portion that restricts the lid member from entering the tubular member. It can be an effective means for positioning the lid member on the one end side of the tubular member, such as when an opening such as a bottomed can is sealed with the lid member.

  (1-3) The tightening portion is formed over the one end portion of the tubular member and the entire circumference of the lid member, and the one end portion of the tubular member is sealed by the lid member, thereby forming a tubular shape. The opening on one end side of the member can be sealed with a lid member.

  (1-4) After the stacking step, before the winding step, the step of reducing the diameter of the distal end portion in the one end portion direction of the tightening portion in accordance with the winding direction is performed. The one end side of the part can be reliably received by the winding guide part.

  (1-5) After the winding step, by having a flattening step of pressing and flattening the wound tightening portion in the radial direction of the tubular member, the winding member and the lid derived from the tubular member Adhesiveness with the winding part derived from a member can be improved more.

  (1-6) The buckling part is wound in the inner direction of the tubular member, and the buckling prevention mold in close contact with the outer peripheral surface of the winding part is supported in the buckling prevention process. As a result, the tightened winding portion does not protrude outward in the radial direction of the tubular member, and even when a plurality of tubular members are arranged, it is possible to eliminate wasteful space due to the tightening portion. . Here, the outer peripheral surface of the pressing die is shaped so as to be in close contact with the inner peripheral surface of the buckling prevention die, so that the buckling of the tubular member by the pressing die is effective when the tightening portion is internally wound. Can be prevented.

  (1-7) The winding guide part is preferably a groove extending along the winding part. The winding guide portion can be sufficiently wound even if it is provided in the minimum length and number that can wind the winding portion, but the groove provided continuously along the winding portion and By doing so, it is possible to perform the tightening more reliably.

(2) The tubular member manufacturing apparatus of the present invention that solves the above-described problem is an apparatus that winds up a cylindrical member having at least one end opened and a lid member fixed to the one end.
The one end portion of the cylindrical member and the lid member each have a tightening portion having a shape that overlaps and adheres at least in a portion to be tightened, and the tube in a state in which the respective tightening portions are overlapped. For the shaped member and the lid member,
A winding guide in which the cross-sectional shape is a curve having a shape similar to that of the outer shape after the tightening portion is wound, and the winding tightening guide is arranged substantially along a portion where the one end side of the tightening portion is located The one end side of the overlapping tightening portion is wound along the cross-sectional shape of the pressing die by contacting and pressing the winding tightening portion from the direction in which the one end portion opens. A movable push mold,
It has a buckling prevention mold which is a fixed mold which prevents buckling by supporting the tightening portion from a direction opposite to the direction in which the pressing mold is tightened.

  According to the manufacturing method and the manufacturing apparatus of the tubular member of the present invention, since the tightening is completed by pressing with a mold and the degree of the tightening can be controlled, the tubular member having excellent sealing performance without using a sealing material Can be provided.

  The tubular member manufacturing method of the present invention can be applied to a method in which a lid member is fixed to one end of a cylindrical member having at least one end opened. Here, the fixing of the tubular member and the lid member is performed by a method generally called winding. By adjusting the number and length of the tightening, necessary performance such as sealing performance can be obtained.

  The object to which the present invention can be applied includes bottomed, bottomless, such as fixing of a bottomed tubular member and a lid member as a casing of a sealed battery such as a lithium battery, sealing of a can for foods and beverages, etc. Regardless of the method, the method of fixing the lid member to one end portion of the tubular member that is open can be generally applied. The cross-sectional shape of the tubular member can be applied to a polygon such as a square as well as a circle. When the cross-sectional shape is a polygon, it is desirable to round the corner portion with a curve from the viewpoint of easy winding.

  The tubular member and the lid member may not be fixed over the entire circumference of the opening of the tubular member, and a part of the tubular member and the lid member may be unwound. One end portion of the tubular member and the lid member each have a tightening portion having a shape that overlaps and closely contacts at least a portion to be wound. The length of the tightening portion in the opening direction is determined according to the length for performing the tightening. The length of the tightening portion can increase the number of times of tightening.

  The inner peripheral surface of the tubular member can have a reduced diameter portion that restricts the entry of the lid member when the lid member abuts and can position the tubular member in the opening direction. This is because, for example, a bottomed tubular member cannot be fixed from the inside of the tubular member for positioning of the lid member. It is also useful when a power generation element housed inside is required to have no influence from external force, such as a battery.

  The method for manufacturing a tubular member of the present invention includes an overlapping process, a winding process, a buckling prevention process, and other processes. The overlapping process is a process of overlapping the tubular member and the lid member. This is a step of inserting and fixing the lid member on the inner peripheral surface of one end of the lid member.

  The winding process is a process in which pressing is performed with a pressing die from one end side of the overlapped tightening portions, and the winding portions are sequentially rolled. The pressing die has a winding guide part having a cross-sectional shape made of a curve having a cross-sectional shape similar to that of the outer shape after the winding part is wound. It is desirable that the cross-sectional shape of the winding tightening guide portion is configured with a smooth curve so that the winding tightening portion (especially one end portion side of the tightening portion to be tightened in the initial stage of the tightening) slides smoothly. For example, examples of the cross-sectional shape of the winding guide portion include a semicircular shape and a U-shape.

  One end portion side of the winding tightening portion comes into contact with the winding tightening guide portion and is bent following the cross-sectional shape of the winding tightening guide portion. The winding tightening guide portion is disposed at a main portion of the winding tightening portion so that the winding tightening portion can be reliably tightened.

  For example, when the shape of the opening of the tubular member is composed of a straight portion and a curved portion, more winding tightening guide portions are disposed on the portion corresponding to the curved portion than the straight portion. Winding can be performed more smoothly. If possible, it is desirable from the viewpoint of the reliability of winding tightening to continuously extend the winding tightening guide portion to the part corresponding to all of the one end side of the winding tightening portion.

  In the winding process, stress is applied to the tightening portion (in some cases, other portions of the tubular member) in a direction in which buckling proceeds. Therefore, the buckling prevention step includes a step of preventing the progress of buckling by supporting the winding portion. When the tightening portion is wound in the inner direction of the tubular member, the support of the tightening portion in the buckling prevention step can be performed by a buckling prevention mold that is in close contact with the outer peripheral surface of the tightening portion. .

  The other steps are not particularly limited, and may include other general treatments (for example, a step of forming a tubular member). As a process related to the present invention, after the overlapping process and before the winding process, there is a process of reducing the diameter of the end of the overlapped tightening portion in the direction of one end according to the winding direction. Can do. By forming a bend (reduced diameter or expanded diameter) on one end side of the tightening portion in advance, the tightening can be performed smoothly in the winding process. Specifically, it is desirable to reduce the diameter in the case of inner winding and to increase the diameter in the case of outer winding.

  Further, for the purpose of making the adhesion between the tubular member and the lid member more complete, a flattening step of flattening by pressing the wound tightening portion in the radial direction of the tubular member after the winding step is performed. Can have. Flattening can be achieved by creating a pressing die having a corresponding shape and pressing with the pressing die.

  The method for producing a tubular member of the present invention will be described in detail below with reference to the drawings. The drawings used for explanation are schematic diagrams, and the dimensions and ratios of the respective parts are not necessarily accurate (especially, the plate thickness with respect to the size of the members).

  As shown to Fig.1 (a), the tubular member which applies the manufacturing method of the tubular member of a present Example is the can main body 11 and the cover member 12 which are the bottomed tubular members which one end part opens. As shown in the top view of FIG. 1B, the can body 11 is a rectangular parallelepiped whose section perpendicular to one end is a square with rounded corners. A tightening portion 111 is provided in the vicinity of one end portion, and a reduced diameter portion 112 having a reduced diameter is formed at the lower end of the tightening portion 111. The reduced diameter portion 112 is formed by reducing the plate thickness above the reduced diameter portion 112 in the drawing.

  The lid member 12 is a member having a shape that can be fitted in the vicinity of the opening of the can body 11. The lid member 12 is provided with a tightening portion 121, and the diameter-reduced portion 112 of the can main body 11 abuts on the lower end of the tightening portion 121 so that the lid member 12 cannot enter any more when inserted from the opening. It has become.

  Superposition process: The can body 11 and the lid member 12 are superposed. The lid member 12 is inserted and fitted from one end of the can body 11. The tightening portion 111 of the can body 11 and the tightening portion 121 of the lid member 12 are closely stacked.

  Diameter reduction step: As shown in FIG. 2, this is a step of reducing the diameter of one end of the overlapped tightening portions 111 and 121. Although not shown in the figure, by pressing a reduced-diameter mold having a shape corresponding to the degree of reduced diameter from one end side against the superimposed can body 11 and lid member 12 before being inserted into the mold. The diameter is reduced (when the diameter is expanded (in the case of external winding), the diameter is increased on the contrary). In this figure, before the lid member 12 is inserted into the can main body 11, the diameter of the winding portion 121 is reduced.

  In addition, there is a case where it is not necessary to reduce the diameters of the tightening portions 111 and 121 by the diameter reducing process, which will be described together in the winding process described later.

  Winding step and buckling prevention step: The superimposed can body 11 and lid member 12 are inserted into a buckling prevention die 22. Then, it presses with the press die 21 from the upper part. As shown in FIGS. 2 and 3, the pressing die 21 is formed with a winding fastening guide portion 212 that can contact one end side of the winding fastening portions 111 and 121 over the entire circumference in which the winding fastening portions 111 and 121 are provided. Yes. The cross-sectional shape of the winding guide portion 212 is a semicircular shape, and a protrusion 211 is formed in the vicinity of the center portion. When the pressing die 21 is inserted into the buckling prevention die 22, the winding guide portion 212 comes into contact with the winding portions 111 and 121.

  One end of the tightening portions 111 and 121 is reduced in diameter so as to face inward, and the cross-sectional shape of the winding tightening guide portion 212 is a smooth semicircular shape. The part side is bent inward following the cross-sectional shape of the winding guide part 212.

  Further, when the pressing die 21 is pressed, one end portions of the winding tightening portions 111 and 121 protrude from the winding tightening guide portion 212. In this case, the winding tightening portions 111 and 121 are separated from the buckling prevention mold 22 and are continuously bent by the winding tightening guide portion 212, so that the one end portion that protrudes is wound as it is. The winding is completed (FIG. 4).

  The winding portions 111 and 121 are stressed in the diameter-expanding direction from the winding guide portion 212 as the pressing die 21 enters, but are pressed from the outer peripheral surface of the winding portions 111 and 121 by the buckling prevention die 22. The buckling is prevented by being supported.

  Here, since one end portion side of the tightening portions 111 and 121 is reduced in diameter, it enters and winds into the winding guide portion 212 without any particular problem, but the one end portion side remains without being reduced in diameter. Even in some cases, the winding process can proceed. For example, a portion where the pressing die 21 is in contact with the buckling prevention mold 22 (around the winding guide part 212) is formed in an acute angle, so that the space between the fastening parts 111, 121 and the buckling prevention mold 22 is formed. The pressing die 21 can be entered and wound. Here, the one end side of the can body 11 and the lid member 12 is formed by cutting or the like, but the one end is deformed in the direction of slightly reducing the diameter at the time of cutting, thereby allowing the pressing die 21 to enter. Can contribute.

  Flattening step: After the tightening is finished, the pressing die 21 is extracted, and the wound tightening portions 111 and 121 are pressed and flattened by pressing with a flat die (not shown). By flattening, the adhesiveness between the winding portions 111 and 121 of the can body 11 and the lid member 12 is improved.

(Modification 1)
In addition, as a flat type | mold, the process of extraction of a push type | mold and insertion of a flat type | mold can be skipped by employ | adopting the divided | segmented press type | molds 23, 24, and 25 as shown in FIG. The pressing dies 23, 24 and 25 are concentric dies and can be moved up and down independently.

  As shown in FIG. 7, after the winding molds 111 and 121 are wound using the pressing dies 23, 24, and 25 in the same manner as in FIGS. 2 and 3, the pressing dies 24 are independently moved downward. Further, the wound tightening portions 111 and 121 can be flattened.

(Modification 2)
Furthermore, by adopting the divided pressing dies 26, 27, and 28 as shown in FIG. 8, the diameter reduction process can be performed with the same pressing dies. In other words, the buckling prevention mold 22 is pressed by the divided pressing mold in a state where the one end portions of the tightening portions 111 and 121 are slightly projected. Of the divided pressing dies, the pressing dies 28 first come into contact with one end portions of the tightening portions 111 and 121 to reduce the diameter of the one end portions (a diameter reducing step). Since the outer diameter of the push die 28 is larger than the opening of the buckling prevention die 22, it is stopped before being inserted into the buckling prevention die 22.

  Thereafter, the tightening portions 111 and 121 continue to be urged in the direction of bending inward by the combination of the molds 26 and 27, and after the winding is completed, only the mold 27 is pressed to complete the flattening process. (Not shown). Here, the winding tightening portions 111 and 121 are urged inward by the mold 27 so that the winding process can be continued without the mold 26.

It is the schematic which shows the can main body and lid member as a tubular member used in the Example. It is a schematic sectional drawing explaining the winding process in an Example. It is the schematic of the pressing die used in the Example. It is a schematic sectional drawing explaining the winding process in an Example. It is a schematic sectional drawing which shows the tubular member sealed with the cover member manufactured with the manufacturing method of the Example. It is a schematic sectional drawing of the pressing die used in the modification 1. It is a schematic sectional drawing explaining the flattening process in the modification 1. It is a schematic sectional drawing explaining the winding process and flattening process in the modification 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Can main body 111 ... Tightening part 112 ... Reduced diameter part 12 ... Lid member 121 ... Tightening part 21 ... Push type 211 ... Protrusion 212 ... Tightening guide part 23, 24, 25 ... Push type (It serves as a flat type) Yes)
26, 27, 28... Push mold (also serves as a mold for a diameter reduction process and a flat mold)
22 ... Buckling prevention mold

Claims (10)

A method of winding a cylindrical member having at least one end opened and a lid member fixed to the one end,
The one end portion of the tubular member and the lid member each have a tightening portion having a shape that overlaps and closely adheres at a portion to be tightened,
Superimposing the winding portions of the tubular member and the lid member,
With a mold that makes the push mold movable and the buckling prevention mold fixed,
A winding guide portion that has a cross-sectional shape made of a curve having a shape similar to that of the outer shape after the tightening portion is tightened, and that is disposed substantially along a portion where the one end side of the tightening portion is located. at the press-type having, by the one end to pressed into contact in the winding-out fastening portion in a direction opening the one end side of the overlapped take--out fastening portion along the pusher type the cross-sectional shape winding A winding process to be rotated;
A step of preventing buckling by supporting the tightening portion with the buckling prevention mold in the winding step, and manufacturing the tubular member having the lid member fixed to the one end portion Method. The tubular member manufacturing method according to claim 1, wherein only the one end portion of the tubular member is opened. The manufacturing method of the tubular member of Claim 1 or 2 which has a reduced diameter part which restrict | limits that the said cover member penetrates into this tubular member in the internal peripheral surface of the said tubular member. The winding portion is formed over the entire circumference of the one end portion of the tubular member and the lid member,
The method for manufacturing a tubular member according to any one of claims 1 to 3 , wherein the one end portion of the tubular member is sealed with the lid member. After the superimposition step, according to any one of claims 1 to 4 having a step of condensation diameter or diameter expansion in accordance with the one end direction of the distal end portion of the seam portion in the winding direction before the winding step The manufacturing method of the tubular member of this. The method for manufacturing a tubular member according to any one of claims 1 to 5 , further comprising a flattening step of flattening the wound tightening portion by pressing in the radial direction of the tubular member after the winding step. The tightening portion is wound in the inner direction of the tubular member,
The method of manufacturing a tubular member according to any one of claims 1 to 6 , wherein the support of the tightening portion in the buckling prevention step is performed by a buckling prevention mold that is in close contact with an outer peripheral surface of the tightening portion. The method for manufacturing a tubular member according to claim 7 , wherein an outer peripheral surface of the pressing die is in a shape of closely contacting an inner peripheral surface of the buckling prevention mold. The method for manufacturing a tubular member according to any one of claims 1 to 8 , wherein the winding guide portion is a groove extending along the winding portion. An apparatus for winding up a cylindrical member having at least one end opened and a lid member fixed to the one end,
The one end portion of the cylindrical member and the lid member each have a tightening portion having a shape that overlaps and adheres at least in a portion to be tightened, and the tube in a state in which the respective tightening portions are overlapped. For the shaped member and the lid member,
A winding guide in which the cross-sectional shape is a curve having a shape similar to that of the outer shape after the tightening portion is wound, and the winding tightening guide is arranged substantially along a portion where the one end side of the tightening portion is located The one end side of the overlapping tightening portion is wound along the cross-sectional shape of the pressing die by contacting and pressing the winding tightening portion from the direction in which the one end portion opens. A movable push mold,
A buckling prevention mold that is a fixed mold for preventing buckling by supporting the tightening portion from a direction opposite to the direction in which the pressing mold is tightened; An apparatus for manufacturing a tubular member with a fixed member.

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