JP2006320915A - Method and apparatus for forming bead on rectangular can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming method of beads of a rectangular can and an apparatus for it by which the beads are formed on the whole surface of the rectangular can with high accuracy, its structure is simplified and which are excellent in the durability of dies or the like. <P>SOLUTION: This apparatus is composed by providing an inner die 11 of expandable and reducible segmental dies 11a which is arranged on the apparatus 10 for forming the beads 2a on the can body of the rectangular can 2 by a press mechanism 14 by using the inner die 11 and an outer die 13, also an expandable and reducible filling inner die 12 which is arranged in a clearance caused by the expansion movement of the inner die 11 and outer die 13 of expandable and reducible segmental segmental dies 13a which is arranged on the outside of the rectangular can. In this way, support in the state where the clearance of the inner die 11 is eliminated can be achieved because rigidity is increased to that of the inner die 11 with the filling inner die 12, the beads 2a are formed with high accuracy and the durability of the inner die 11 and the filling inner die 12 is secured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for forming a bead of a square can, and is intended to eliminate the influence of a gap between the split molds on the can body so that the bead can be formed into a stable shape. This is suitable for improvement.

  Cans that are sealed by winding a can lid around the opening of the can body are used for various applications. In addition to cylindrical ones, there are can barrels such as a square cylinder and a polygonal cylinder. Some of these cans form uneven beads on the can body. For example, in secondary batteries and capacitors, bead molding is performed on the entire surface to form the can body into a wave shape for heat dissipation. There is something that is done.

  When bead molding is applied to such a can body, an intermediate mold and an outer mold for bead molding that can be expanded and contracted are used to enlarge the inner mold disposed inside the square element can and to reduce the outer mold. The can body is pressed to form a bead.

  In such bead molding, the outer mold can be reduced so that the split molds can be brought into close contact with each other, but since the middle mold moves so as to expand, a gap is formed between the split molds. It remains in a square can.

Therefore, in order to eliminate the influence of the gap of the middle mold, for example, the one disclosed in Patent Document 1 is a case where only one rib (corresponding to a bead) is formed, but as shown in FIG. In this bead forming apparatus 1, the outer mold 3 divided by 4 is arranged on the outer side of the element can 2 A, while the inner mold 4 (corresponding to the middle mold) 4 is arranged on the inner side of the element can 2 A, and each inner mold 4 is provided with a C-shaped recessed part 5, and a substantially inverted U-shaped piece 6 is fitted and inserted therein, and the inner mold 4 is expanded and contracted via a taper cam 7. After the piece 6 is slid to fill the gap, the outer mold 3 is reduced and the bead 2 a is formed to obtain the square can 2.
Japanese Utility Model Publication No. 55-129598

  However, the C-shaped piece 6 has a problem that it is small and low in rigidity compared to the other inner mold 4 portions, and cannot be uniformly molded, or is less durable than the other inner mold 6.

  Further, the expansion / contraction movement of the inner mold 6 is performed by raising and lowering the conical taper cam 7 arranged at the center of the bottom of the inner mold 6 so that the expanded state is held via the taper surface. However, there is a problem that the structure becomes complicated, for example, it is difficult to hold the inner mold 4 to secure the supporting force accompanying the molding, and a support mechanism such as a large cylinder is required.

  The present invention has been made in view of the above-mentioned problems of the prior art, and can form a bead with high accuracy on almost the entire surface of the square can, can simplify the structure, and has excellent durability such as a mold. It is an object of the present invention to provide a bead forming method and apparatus therefor.

  In order to solve the above-described problems of the prior art, the bead molding method for a square can according to claim 1 of the present invention is characterized in that when forming a bead on the can body of the square can using an intermediate mold and an external mold for bead molding, The middle mold of the split mold that can be enlarged / reduced is moved inside the square can, and the middle mold that can be enlarged / reduced is arranged in the gap by the expansion movement of the middle mold to hold the middle mold and the middle mold, and the outer mold of the square can is divided. This is characterized in that the outer mold of the mold is reduced and formed.

  According to this bead molding method for a square can, when a bead is molded using a middle mold and an outer mold for bead molding on the can body of the square can, the middle mold of the split mold is enlarged and moved inside the square can. By placing the filling middle mold in the gap due to the expansion movement of the middle mold and holding these middle mold and filling middle mold, the filling middle mold has the same rigidity as the middle mold, eliminating the gap in the middle mold, and the bead with high accuracy It can be molded, and the durability of the middle mold and the filling middle mold can be secured.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the bead molding method of the square can is configured so that the expansion / contraction movement of the filling middle mold is interlocked with the raising / lowering of the slide of the press mechanism, The middle mold is moved in an enlarged / reduced manner in conjunction with the enlargement / reduction.

  According to this bead molding method of the square can, the expansion / contraction of the filling mold is interlocked with the slide, and the intermediate mold is moved in conjunction with the expansion / contraction of the filling mold without increasing the process for moving the filling mold. The mechanism is simplified to mold the bead.

  Further, in the method for forming a square can according to claim 3 of the present invention, in addition to the configuration according to claim 1 or 2, a square element can is disposed outside the reduced middle mold and the filling middle mold on the bolster. Thereafter, the slide is lowered to move the filling middle mold in an enlarged manner, and the middle mold is enlarged and held through the filling middle mold, and the slide is further lowered to reduce and move the outer mold. It is characterized by doing so.

  According to this bead forming method of the square can, the filling mold and the middle mold can be expanded and held only by lowering the slide, and further, the slide can be lowered and molded by the outer mold. The bead can be formed by the movement of the slide.

  According to a fourth aspect of the present invention, there is provided a square can bead forming apparatus for forming a bead on a can body of the square can with a press mechanism using an intermediate mold and an outer mold for bead forming. A split mold that can be expanded and contracted is provided on the inside, and an intermediate mold that can be expanded and contracted is disposed in a gap formed by the expansion movement of the intermediate mold. It is characterized by comprising.

  According to this bead forming apparatus for a square can, a split mold that is disposed inside the square can and can be expanded and contracted in an apparatus for forming a bead on the can body of the square can with a press mechanism using an intermediate mold and an outer mold for bead forming. The middle mold is provided with a filling middle mold that is disposed in the gap due to expansion movement of the middle mold and can be expanded and contracted, and is provided with a split outer mold that is disposed outside the square can and can be expanded and contracted. Thus, the rigidity can be increased to the same level as that of the middle mold, and the support can be supported in a state where the gap of the middle mold is eliminated, the bead can be molded with high accuracy, and the durability of the middle mold and the filling middle mold can be secured.

  Furthermore, the bead forming apparatus for a square can according to claim 5 of the present invention is provided with an interlocking mechanism for interlocking the expansion / contraction movement of the filling mold with the elevation of the slide of the press mechanism in addition to the structure according to claim 4. In addition, a second moving expansion / contraction mechanism for expanding / contracting the middle mold in conjunction with the expansion / contraction movement of the filling middle mold is provided.

  According to this bead molding device for square cans, the filling mold can be linked to the slide by the interlocking mechanism, and the middle mold can be linked to the filling mold by the second interlocking mechanism, so that the bead molding can be performed only by the operation of the slide. The device is simplified so that it can be molded efficiently.

  According to a sixth aspect of the present invention, in addition to the configuration of the fourth or fifth aspect, the bead forming apparatus for the square can is configured such that an interlocking mechanism between the filling mold and the slide is coupled to the slide. A direct acting cam mechanism comprising a piston rod having a conical cam surface and a holding cylindrical surface disposed in the center and a partial conical cam surface of the inner surface of the filling mold that is driven in contact with the conical cam surface. To do.

  According to this bead forming apparatus for a square can, the piston rod of the linear cam mechanism by the conical surface of the piston rod and the partial conical surface of the filling middle mold can be expanded and contracted by sliding, and the supporting state can also be maintained by the holding cylindrical surface. I am doing so. Thereby, it can support without adding the supporting force accompanying shaping | molding specially, without causing the increase in the process for expansion / contraction of a middle mold | type and a filling middle mold | type.

  Furthermore, in addition to the structure according to any one of claims 4 to 6, the bead forming device for a square can according to claim 7 of the present invention forms a plane perpendicular to the expansion / contraction direction on the back surface of the middle mold. Inclined guide surfaces that contact the flat surface are formed on both side surfaces of the filling mold.

  According to this bead forming apparatus for a square can, the plane of the middle mold and the inclined guide surfaces of the filling middle mold on both sides can be brought into contact with each other, and the expansion and contraction can be reliably performed with a simple configuration.

    According to the bead molding method for a square can according to claim 1 of the present invention, when the bead is molded on the can body of the square can using the middle mold and the outer mold for bead molding, the split mold is formed inside the square can. Since the middle mold was expanded and the filling middle mold was placed in the gap due to the middle mold expansion movement to hold these middle mold and filling middle mold, the middle mold gap was improved by increasing the rigidity to the same level as the middle mold. The bead can be molded with high accuracy, and the durability of the middle mold and the filling middle mold can be ensured.

  Further, according to the bead molding method of the square can according to claim 2 of the present invention, the expansion / contraction movement of the filling middle mold is interlocked with the raising / lowering of the slide of the press mechanism, and the middle mold is interlocked with the expansion / contraction of the filling middle mold. Since the expansion / contraction of the filling mold is linked to the slide, the middle mold can be moved in conjunction with the expansion / contraction of the filling mold, thereby preventing an increase in the process for moving the filling mold. The bead can be formed by simplifying the mechanism.

  Further, according to the method of bead molding of the square can according to claim 3 of the present invention, after placing the square element can on the outside of the reduced middle mold and the filling middle mold on the bolster, the slide is lowered to The middle mold is moved in an enlarged manner, and the middle mold is enlarged and held through the middle mold, and the slide is lowered to form the outer mold in a contracted manner. Thus, the filling middle mold and the middle mold can be expanded and held, and the slide can be lowered and molded by the outer mold, and the beads can be molded by a series of slide operations without any special process.

  According to a bead forming apparatus for a square can according to claim 4 of the present invention, the square can is formed in an apparatus for forming a bead on the can body of the square can with a press mechanism using an intermediate mold and an external mold for bead forming. A split mold that can be expanded and contracted, and a middle mold that can be expanded and contracted and disposed in a gap formed by expansion and contraction of the intermediate mold. Because it is configured with a filling middle mold, it can be supported in a state where the rigidity is increased to the same level as the middle mold and the gap in the middle mold is eliminated, the bead can be molded with high precision, and the durability of the middle mold and the filling middle mold are equivalent. Can be secured.

  Furthermore, according to the bead forming apparatus for a square can according to claim 5 of the present invention, the expansion / contraction movement of the filling mold is provided with an interlocking mechanism that interlocks with the raising / lowering of the slide of the press mechanism. Since the second moving expansion / contraction mechanism for expanding / contracting the middle mold in conjunction with the expansion / contraction movement is provided, the filling mold can be linked to the slide by the interlocking mechanism, and the middle mold can be linked to the filling mold by the second interlocking mechanism. be able to. Thereby, a bead can be shape | molded only by operation | movement of a slide, an apparatus can be simplified and it can shape | mold efficiently.

  According to the bead forming apparatus for a square can according to claim 6 of the present invention, the interlocking mechanism between the filling mold and the slide is arranged at the center of the filling mold in conjunction with the slide, Since the piston rod having the holding cylinder surface and the partial conical cam surface of the inner surface of the filling middle mold that is driven in contact with the conical cam surface, the direct acting cam mechanism is used. The piston rod of the linear cam mechanism by the surface can be expanded and contracted by sliding, and the supporting state can also be held by the holding cylindrical surface. Thereby, the force accompanying shaping | molding can be supported, without adding the special supporting force, without causing the increase in the process for expansion / contraction.

  Furthermore, according to the bead forming apparatus for a square can according to claim 7 of the present invention, a plane perpendicular to the expansion / contraction direction is formed on the back surface of the middle mold, and the inclined guide surfaces in contact with the plane are formed on both sides of the filling middle mold. Since it is formed on the surface, the intermediate plane can be brought into contact with the inclined guide surfaces of the filling middle mold on both sides, and the expansion and contraction can be surely interlocked with a simple configuration.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
1 to 5 are related to an embodiment of a bead forming method and apparatus for a square can according to the present invention, and FIG. 1 (a) is a plan view and a front view of the square can before bead forming. Fig. 2 is a plan view and a front view of a square can after bead forming, Fig. 2 is an embodiment of a bead forming apparatus, (a) is a plan view, and (b) is a cross section showing a bead forming state and a state before forming. FIG. 3, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2A showing the bead molding state and the state before molding, and FIG. 4 is a plan view of the middle mold and the filling middle mold part showing the bead molding state and the state before bead molding. FIG. 5 is a plan layout view, a plan view and a longitudinal sectional view of the filling middle mold and the middle mold, respectively.

  In this square can bead forming apparatus (hereinafter simply referred to as a bead forming apparatus) 10, for example, as shown in FIG. As shown in FIG. 2B, an uneven bead 2a is formed on the entire surface of the can body so as to obtain a square can 2 having a quadrangular cross section, thereby eliminating the influence of the gap due to the middle mold of the split mold. In addition to being able to be molded into a highly accurate shape, the mechanism is simplified and the durability of the middle size is improved.

  In this embodiment, a rectangular can is described as an example of a square can, but the present invention is not limited to this, and a polygonal can may be used.

  As this square can 2A, for example, it is drawn into a cylindrical shape with a bottom using, for example, an aluminum PET laminate, and then trimmed into a cylindrical shape by cutting off the bottom portion, etc., and this is reformed into a square cylindrical shape. In addition to the can body that is necked to reduce the upper and lower openings of the can body, it is processed into a rectangular tube shape in various manufacturing processes, and is recessed with respect to the can body of the square element can 2A. By forming the concave-convex bead 2a.

  A bead forming apparatus 10 for forming a bead 2a on the can body of such a square-shaped can 2A includes a split mold middle mold 11 disposed inside the can 2A as a bead forming mold, and the split mold. A split filling mold 12 that fills the gap formed with the expansion movement of the middle mold 11, and an outer mold 13 that is disposed outside the middle mold 11 and the filling mold 12 and the can 2A, As before, the square can in which the bead 2a is formed by moving the middle mold 11 and the filling middle mold 12 to be enlarged inside the raw can 2A and moving the outer mold 13 to be reduced by the press mechanism 14. 2 is molded.

  In this bead forming apparatus 10, the middle mold 11 disposed inside the square blank can 2 </ b> A is provided on the bolster 15 of the press mechanism 14, and is composed of a split mold divided into four so that it can be expanded and contracted. Yes.

  This middle mold 11 is formed by combining four 90-degree split molds 11a each centered on a corner portion and divided upward at the center of a rectangular flat portion, and protruding upward inside the square-shaped element can 2A. The bead forming portion 11b on which the unevenness is formed and the fan-shaped horizontal portion 11c having a central angle of 90 degrees located on the bolster 15 are provided, and the bead forming portion 11b is set on the bolster 15. The can 2A can be positioned inside the four corners of the can body.

  The middle mold 11 composed of the four split molds 11a expands and contracts by moving in a radial direction centered on a corner that is a diagonal direction of a quadrangle, as shown in FIG. A key groove of each split mold 11a is guided along a key 16 attached to the bolster 15, and a ring-shaped presser member 17 is provided so as to cover the outside of the horizontal portion 11c. The mold 11a can be expanded and contracted.

  Each split mold 11a has a spring interposed between the pressing member 17 and the horizontal portion 11c, and is biased in the reduction direction. The back surface of the bead molding portion 11b of the middle mold 11 disposed at the corner of the square element can 2A is a plane 11d orthogonal to the diagonal direction that is the expansion / contraction movement direction. The bead molding portion 11b of the mold 11a has a substantially right-angled isosceles triangular prism shape.

  On the other hand, in the bead molding apparatus 10, when such a middle mold 11 is enlarged and moved, a gap is formed between each split mold 11a, and a filling middle mold 12 is provided to fill the gap. Four split molds 12a are arranged in the gap.

  Each split mold 12a of the filling mold 12 includes a bead molding portion 12b in which irregularities for bead molding are formed and a horizontal portion 12c positioned on the bolster, and is configured in a substantially L shape. Then, 45-degree inclined guide surfaces 12d are formed on both sides of the bead molding portion 12b so as to contact the respective flat surfaces 11d of the adjacent middle molds 11 at the two corners, and the filling of both sides of the flat mold 11b on the middle mold 11 of the corners. By keeping the two inclined guide surfaces 12d of the middle mold 12 in contact with each other, the movement direction is restricted, and the filling middle mold 12 can be expanded and contracted without providing a guide such as a key.

  Further, the horizontal portion 12c of each split mold 12a of the filling middle mold 12 is formed in a substantially rectangular shape, and as shown in FIGS. 2 (b) and 5 (a), the horizontal portions on both sides adjacent to the middle mold 11 at the corner. It is arranged between the step portions 11c and can be expanded and contracted by being pressed by the pressing member 17 through the middle die 11.

  And the bead molding part 12b of each split mold 12a of the filling mold 12 is about one third of one side of the square can 2 in order to ensure substantially the same rigidity and durability as the middle mold 11 of the adjacent corner part. It is as. Thereby, the bead molding part 11b of the middle mold 11 and the bead molding part 12b of the filling middle mold 12 have substantially the same rigidity, and the shape of the molded bead 2a can be made uniform.

  In order to expand and contract the middle mold 11 and the filling middle mold 12 as described above, the filling middle mold 12 is provided with an interlocking mechanism that interlocks with the slide of the press mechanism 14, and is interlocked with the elevation of the slide.

  As shown in FIG. 2B, the interlocking mechanism 18 is composed of, for example, a linear cam mechanism, and includes a piston rod 19 having a conical cam surface 19a recessed inward and a bead molding portion 12b of each filling mold 12. A partial conical cam surface 19b that follows the back surface is formed.

  Therefore, in this interlocking mechanism 18, the filling mold 12 is opened by pushing the piston rod 19 with the slide of the press mechanism 14 while the conical cam surfaces 19 a, 19 b of the linear cam mechanism are in contact with each other. It can be moved to an enlarged state, and conversely, it can be moved to close by pulling up the piston rod 19 to a reduced state. Further, the cylindrical portion of the piston rod 19 is positioned as the holding cylindrical surface 19c on the partial conical cam surface 19b on the back surface of the bead molding portion 12b of each filling middle die 12, so that the expanded state of the filling middle die 12 can be maintained. It is.

  Then, as the second moving expansion / contraction mechanism that expands / contracts the middle mold 11 in conjunction with the expansion / contraction movement of the filling middle mold 12, the inclined guide surface 12d of the filling middle mold 12 and the flat surface 11d of the middle mold 11 are brought into contact with each other and the corner portions The middle mold 11 is also used as a spring for urging in the shrinking direction, and the middle mold 11 at the corner contacting the flat surface 11d via the inclined guide surface 12d is moved by expanding and contracting the filling mold 12. It is designed to be scaled and moved in conjunction.

  Next, the outer mold 13 disposed outside the middle mold 11 and the filling middle mold 12 and the square element can 2A is disposed on a pressing member 17 on the bolster 15 of the press mechanism 14, and the corners are A bead forming part 13b formed with four-part split molds 13a divided at an angle of 90 degrees in the center and formed with irregularities for bead forming, and a fan-shaped horizontal part 13c that is approximately a quarter of a circle. It is prepared.

  As shown in FIG. 3, each split mold 13 a of the outer mold 13 expands and contracts by moving in the radial direction around the corner that is the diagonal direction of the quadrangle. A key groove of each split mold 13 a is guided along the key 20 attached to 17, and a ring-shaped presser member 21 is provided so as to cover the outside of the horizontal portion 13 c, and each split mold is provided inside the presser member 21. 13a can be expanded and contracted. Further, as shown in FIG. 3, a bolt is inserted into the horizontal portion 13c of each split mold 13a from the outside of the presser member 21, and a spring is interposed between the outer side of the presser member 21 and the bolt so that each split mold is inserted. 13a is biased to open outward.

  Then, in order to reduce and move so as to close the outer mold 13, a part of the conical surface 13 d having a small diameter at the upper end and a large diameter at the lower end is formed on the outer periphery of the bead molding portion 13 b of each split mold 13 a, A reduction driving member 23 provided with a conical surface 23a having a large diameter lower end opening and a small diameter upper end is attached to a slide 22 that moves up and down of the press mechanism 14. Accordingly, when the slide 22 is lowered, the outer die 13 is moved to be closed by being pressed down while the conical surface 23a of the reduction driving member 23 and the conical surface 13d of each split die 13a of the outer die 13 are in contact with each other. Can do. Prior to the reduction movement of the outer mold 13 by the lowering of the slide 22, first, the central portion of the reduction driving member 23 attached to the slide 22 is pushed down the piston rod 19 that moves the filling mold 12, thereby The middle mold 11 is enlarged and moved so as to open, and the middle mold 11 is moved so as to open. After the completion of the movement of the filling middle mold 12 and the middle mold 11, the reduction movement of the outer mold 13 is started.

Next, the operation of the bead forming apparatus 10 for the square can configured as described above and the bead forming method for the square can will be described.
First, the middle die 11 and the filling middle die 12 on the bolster 15 of the press mechanism 14 are brought into a closed reduced state by pulling up the piston rod 19 of the interlocking mechanism 18, and the square element can 2 </ b> A is placed in the middle die 11. And set outside the filling mold 12.

  Thereafter, when the slide 22 of the press mechanism 14 is lowered, the upper end surface of the piston rod 19 comes into contact with the central portion of the reducing conical member 23 attached to the slide 22.

  When the slide 22 is further lowered from this state, the piston rod 19 is pushed down so that each split mold 12a is opened by contact between the conical cam surface 19a and the partial conical cam surface 19b of each split mold 12a of the filling mold 12. The middle mold 12 is moved to the expanded state, and the split molds 11a of the middle mold 11 in contact with the inclined guide surfaces 12d of the middle mold 12 through the plane 11d are moved outward so as to be expanded. .

  When the slide 22 is further lowered, the piston rod 19 is pushed down, the partial conical surface 19b of the filling mold 12 comes into contact with the holding conical surface 19c of the piston rod 19, and the expanded state of the filling mold 12 is maintained. By holding the expanded state of the filling middle mold 12 in this way, the expanded state of the middle mold 11 can also be maintained, and the molding force can be maintained without applying a holding force only by holding the vertical position of the piston rod 19. It becomes possible to do.

  Thus, by setting the middle mold 11 and the filling middle mold 12 in the enlarged state, the middle mold 11 and the filling middle mold 12 can be arranged without any gap inside the square element can 2A. In this state, when the slide 22 of the press mechanism 14 is further lowered, the conical surface 23a of the reduction driving member 23 and a part of the conical surface 13d of each split mold 13a of the outer die 13 come into contact with each other. The bead 2a is formed by the bead forming portions 13c, 11c, and 12c by being reduced and moved so as to be closed and pressed so that the entire surface of the can body of the square can 2A is sandwiched between the outer die 13, the middle die 11 and the filling middle die 12. (See the left half of FIG. 3).

After the molding, when the slide 22 is lifted, the reduction driving member 23 attached to the slide 22 is lifted in conjunction with this, and the outer die 13 biased by the spring is moved and expanded so that the piston rod 19 is expanded. Is pushed so that each split mold 12a of the filling middle mold 12 is closed via each split mold 11a of the middle mold 11 biased in the shrinking direction by the spring, and the middle mold 11 and the filling middle mold 12 are moved. Reduced to close.
Thereby, the square can 2 can be taken out from the middle mold 11 and the filling middle mold 12.

  According to such a bead molding method and apparatus for a square can, the bead molding can be performed with no gap between the middle mold 11 constituted by the split molds 11a and 12a and the filling middle mold 12, and the shaped square can 2 Can be molded without a parting line.

  In addition, since the middle mold 11 and the filling middle mold 12 are each of substantially the same size and ensure substantially the same rigidity, the molded part is supported substantially uniformly as compared with the case where the filling middle mold 12 is constituted by a piece. The bead can be formed into a highly accurate shape, and the durability of the filling middle mold 12 can be made equivalent to that of the middle mold 11, so that the durability can be greatly improved.

  Further, the molding force applied to the middle mold 11 and the filling middle mold 12 along with the bead molding can be supported simply by positioning the holding cylindrical surface 19c of the piston rod 19 on the back surface of the filling middle mold 12, and a support mechanism such as a fluid pressure cylinder. Therefore, the mechanism can be simplified and supported.

  Moreover, since the rigidity of each can be made uniform by using the middle mold 11 and the filling middle mold 12 as compared with the case where the conventional pieces are used, even when the square can is large, the force accompanying the molding can be supported. It becomes easy and suitable for bead molding to a large can.

  By forming the bead 2a on the entire surface of the can body of the square can 2 in this manner, a gap due to the bead 2a can be secured between the adjacent square cans 2 and 2 when the square cans 2 are arranged side by side. Even when the contents that generate heat are filled, it is possible to efficiently dissipate heat. Thereby, when a square can is used as a battery or capacitor container, space can be saved and cooling can be performed efficiently.

  In the above-described embodiment, the square can can be used as a container for a normal fluid as well as a container for a battery or a capacitor, for example.

  In addition, by necking and reducing the openings at the upper and lower ends in advance, even when the canopy and the bottom lid are tightened and sealed, the tightened portion can be prevented from protruding outside the can body. In particular, it is effective in improving space efficiency when a large number of square cans are arranged or stacked, and is more suitable as a battery or capacitor container.

1 is a plan view and a front view of a square-shaped can before bead forming, and FIG. 2 (b) is a view of a square can after bead forming. It is a top view and a front view. 1A is a plan view, and FIG. 2B is a cross-sectional view showing a bead molding state and a state before molding, according to an embodiment of a bead molding method and apparatus for a square can of the present invention. It is AA sectional drawing in Fig.2 (a) which shows the bead shaping | molding method of the square can of this invention and one Embodiment of the apparatus, and shows the bead shaping | molding state and the state before shaping | molding. FIG. 3 is a plan view of a middle mold and a filling middle mold portion showing a bead molding state and a state before bead molding according to one embodiment of a bead molding method and apparatus for a square can of the present invention. FIG. 4 is a plan layout view, a plan view, and a longitudinal sectional view of a filling middle mold and a middle mold, respectively, according to one embodiment of a bead molding method and apparatus for a square can of the present invention. It is the top view and sectional drawing of the conventional bead forming apparatus.

Explanation of symbols

2A Square type can 2 Square can 2a Bead 10 Square can bead forming device (bead forming device)
11 Middle mold 11a Split mold 11b Bead molding part 11c Horizontal part 11d Plane 12 Filling middle mold 12a Split mold 12b Bead molding part 12c Horizontal part 12d Inclined guide surface 13 Outer mold 13a Split mold 13b Bead molding part 13c Horizontal part 13d Conical surface 14 Press mechanism 15 Bolster 16 Key 17 Pressing member 18 Interlocking mechanism 19 Piston rod 19a Conical cam surface 19b Partial conical cam surface 19c Holding cylinder 20 Key 21 Pressing member 22 Slide 23 Reduction drive member 23a Conical surface

Claims (7)

When forming a bead using a middle mold and an outer mold for bead molding on the can body of a square can,
An inside mold of the split mold that can be expanded and contracted is moved inside the square can, and a filling middle mold that can be expanded and contracted is arranged in the gap by the expansion movement of the middle mold to hold the middle mold and the filling middle mold, A bead molding method for a square can characterized in that the outer mold of the split mold is molded while being reduced.   2. The square can according to claim 1, wherein the expansion / contraction movement of the filling middle mold is interlocked with the raising / lowering of the slide of the press mechanism, and the middle mold is expanded / contracted in conjunction with the expansion / contraction of the filling middle mold. Bead molding method.   After placing the rectangular cans on the outside of the reduced middle mold and the filling middle mold on the bolster, the slide lowers to expand and move the filling middle mold, and to move the middle mold through the filling middle mold, respectively. 3. The method of forming a square can bead according to claim 1 or 2, wherein the outer mold is reduced and moved to form by holding the slide further down. An apparatus for forming a bead on a can body of a square can with a press mechanism using a middle mold and an outer mold for bead molding,
A split mold that is disposed inside the square can and includes a split mold that can be expanded and contracted, and includes a filling middle mold that is disposed in a gap by expansion movement of the medium mold and can be expanded and contracted, and is disposed outside the square can and can be expanded and contracted. A bead molding device for a square can characterized by comprising an outer mold.   Provided with an interlocking mechanism that interlocks the expansion / contraction movement of the filling mold with the raising / lowering of the slide of the press mechanism, and a second moving expansion / contraction mechanism that expands / contracts the intermediate mold in conjunction with the expansion / contraction movement of the filling mold The bead forming device for a square can according to claim 4, wherein the bead forming device is configured.   An interlocking mechanism between the filling middle mold and the slide is arranged in the center of the filling middle mold in conjunction with the slide, and a piston rod provided with a conical cam surface and a holding cylindrical surface is driven in contact with the conical cam surface. 6. The bead forming apparatus for a square can according to claim 4 or 5, characterized in that it is constituted by a linear cam mechanism with a partial conical cam surface of the inner surface of the filling middle mold.   7. A plane perpendicular to the expansion / contraction direction is formed on the back surface of the middle mold, and inclined guide surfaces that are in contact with the plane are formed on both side surfaces of the filling middle mold. The bead forming device for the square can described.

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