JP2004160503A - Method and apparatus for forming metallic cap and metallic can container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the method and the apparatus for forming metallic caps by which a fitting/projecting part which is properly fit and locked on the container body of the metallic can container are mass-produced continuously and stably at low cost, and also to provide a metallic can container. <P>SOLUTION: This method is composed of a first press-forming stage 11 where a metallic sheet is cut into a circle or a polygon and simultaneously the top face part of the cap and a cylindrical peripheral wall part having a slightly larger diameter than the top face part through a boundary stepped part are respectively drawn, a second press-forming stage 12 where the required side of the lower end part of the cylindrical peripheral wall part is preformed as the small diameter part for fitting in the opening of the container body and a third press-forming stage 13 where the boundary part between the cylindrical peripheral wall part and the small diameter part of the cap is properly finished. Furthermore, the method is composed of a fourth press-forming stage 14 where preforming for inwardly curling the open edge part of the small diameter part of the cap is performed, a fifth press-forming stage 15 where the open edge part of the small diameter part of the cap is curled surely inwardly and a sixth press-forming stage 16 where a plurality of fitting/projecting parts for elastically riding across and locking to an annular projecting part where the open edge part of the container main part is inwardly curled are formed in a part of the small diameter cap part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal can container, and in particular, a method for forming a metal lid for molding a metal lid provided with a protrusion that fits and locks properly with respect to the opening of the can container body, and The present invention relates to a forming apparatus and a metal can container.
[0002]
[Prior art]
Conventionally, a container is known in which a container lid having an outer diameter substantially the same as the outer diameter of the container body is detachably fitted to the upper end opening of the container body formed in a cylindrical shape. .
[0003]
This type of container has a bulge formed in the opening of the container body so that the container lid with respect to the opening of the container body can be easily detached from the container body and the stored items are not discharged or scattered. It has been proposed to have a configuration in which a protruding portion that is locked to an edge portion is provided on a part of the container lid.
[0004]
For example, as a kitchen container, provided with a plastic container main body and a lid, the container main body is formed of plastic and is projected inward along the upper edge. A cylindrical container body having an upper opening, and a lid having a disk shape formed of plastic, and a circular flat plate portion and an upright peripheral wall portion having a small height provided on an outer peripheral edge of the flat plate portion And a flange portion bent from the upright peripheral wall portion, and a second annular protrusion having an outer diameter larger than the inner diameter of the first annular protrusion protrudes from a lower portion of the outer periphery of the upright peripheral wall portion. A container has been proposed in which the lid is elastically deformed by pressing the central portion of the lid so that the second annular protrusion crosses over the first annular protrusion and is hooked (practical use). New model registration No. 3026916 PR).
[0005]
Conventionally, as a can-like container for storing things that are not sensitive to moisture, such as tea leaves and seaweed, the upper end of the metal can-like container body is pushed inward downward to form a double wall structure. A container is proposed in which a sealing material made of resin or the like provided on the lid is in surface contact with the inner surface of the inner wall of the double wall structure (Japanese Utility Model Laid-Open No. 5-81046).
[0006]
As described above, in the case of a plastic container, in order to make the container body have a rigid structure, it is necessary to increase the wall thickness, which increases the molding cost. On the other hand, the lid body can easily form a protrusion for hooking on the container body for the plastic forming process.
[0007]
In addition, in the case of a metal can container, as described above, when a sealing material such as a resin is provided in the fitting portion between the container body and the lid, a composite structure composed of a metal and a resin is used. In addition to the time and effort required for production, there are problems such as an increase in production cost.
[0008]
However, today, as a container for various uses that require rigidity, the forming process of the container body of the metal can container can be easily and at low cost. In particular, depending on the properties of the stored items, a metal can container may be indispensable. From such a viewpoint, conventionally, a can container in which the container body is made of metal and the lid body is made of plastic that can be easily molded has been put into practical use.
[0009]
[Problems to be solved by the invention]
Thus, conventionally, a method and apparatus for molding a metal lid provided with a fitting protrusion that can be properly fitted and locked to a container body in a metal can container, Not yet proposed and implemented.
[0010]
Therefore, the inventors of the present invention are to develop a method and an apparatus for forming a metal lid provided with a protrusion that can be properly fitted and locked to the container body in the metal can container. As a result of various examinations and trial productions,
(1) First, the metal plate material is cut into a circular shape or a polygonal shape, and at the same time, the top surface portion of the lid and the cylindrical peripheral wall portion having a slightly larger diameter with respect to the top surface portion via a boundary step portion are respectively drawn. The press molding process,
(2) a second press molding step of preforming a required lower end side of the cylindrical peripheral wall portion of the drawn lid body as a narrow diameter portion for fitting into the opening of the container body;
(3) a third press molding step for appropriately shaping a boundary portion between the cylindrical peripheral wall portion and the small diameter portion of the preformed lid,
(4) a fourth press molding step of performing preforming for curling the opening edge portion of the narrow-diameter portion of the properly shaped lid inward;
(5) a fifth press molding step of securely curling the opening edge of the narrow-diameter portion of the curl preformed lid, on the inside;
(6) A plurality of fittings that elastically climb over and engage with an annular protrusion having the opening edge of the container body curled inwardly at a part of the narrow diameter portion of the appropriately shaped lid. With a sixth press molding process for molding the mating protrusion,
It was ascertained that a metal lid provided with a fitting protrusion that can be properly fitted and locked to the container body can be easily formed.
[0011]
Therefore, the first press forming step in the metal lid forming method of the present invention is a cutting / drawing forming means, a die cutter for cutting the metal plate material forming the lid into a circle or a polygon, and the lid A die assembly provided with a center die for forming a top surface portion of the sheet, a knockout ring for forming a cylindrical peripheral wall portion of the lid between the die cutter and the center die, a punch cutter corresponding to the die cutter, and the center die And a punch assembly provided with a punch ring corresponding to the knockout ring, a step forming recess is provided at the outer peripheral edge of the center die of the die assembly, and the punch of the punch assembly is provided. By forming a step-shaped molding protrusion on the part adjacent to the center punch of the ring, the metal lid can be molded. It can be achieved in smooth.
[0012]
The second press forming step in the metal lid forming method of the present invention is a necking pre-forming means, comprising: a die ring that abuts and holds the top surface side of the cut / drawn lid body; and a center die. A punch assembly provided with a die assembly provided, a punch ring corresponding to the die ring, and a center punch corresponding to the center die, and the center punch of the punch assembly is formed by drawing an outer diameter thereof. The diameter is set to be smaller than the cylindrical peripheral wall portion of the lid body, and the tip end portion of the punch ring located on the outer periphery of the center punch is in sliding contact with the lower end portion side of the cylindrical peripheral wall portion of the lid body. By forming a necking preforming recess for preforming a narrow diameter part to be fitted into the opening of the container body, the metal lid can be smoothly molded.
[0013]
Further, the third press forming step in the metal lid forming method of the present invention is a necking shaping means, a die ring that abuts and holds the top surface side of the necking preformed lid, a center die, A punch assembly corresponding to the die ring, and a punch assembly provided with a center punch corresponding to the center die. The center punch of the punch assembly has a radius with respect to the outer periphery thereof. A plurality of center punches that are equally divided into a plurality of directions and whose outer periphery is surrounded and held by an elastic holding ring, and a necking shaped projection is provided on the outer periphery of the tip end side of the multi-part center punch. A necking shaping step corresponding to the necking shaping protrusion is provided on the inner peripheral edge of the ring tip, and the multi-divided center punch A multi-divided center punch expanding operation shaft that is inserted and arranged in the center and elastically expands outward in the radial direction, and performs necking shaping by the interaction between the necking shaping protrusion and the necking shaping step. With the configuration in which the metal lid is formed, the metal lid can be smoothly molded.
[0014]
Furthermore, the fourth press molding step in the metal lid molding method of the present invention is a curl preforming means, a die ring that abuts and holds the top surface side of the necked and shaped lid, a center die, A punch assembly corresponding to the die ring, and a punch assembly provided with a center punch corresponding to the center die. The center punch of the punch assembly has a radius with respect to the outer periphery thereof. A multi-divided center punch which is equally divided into a plurality of directions and whose outer periphery is surrounded and held by an elastic retaining ring. A curl preformed curved protrusion for performing preforming for curling on the punch ring, and the curl preformed curved protrusion on the inner peripheral edge of the tip end of the punch ring. Correspondingly, a curl pre-formed curved step is provided, and further inserted into the central part of the multi-division center punch and elastically expanded outward in the radial direction. By forming the multi-division center punch expanding operation shaft that performs the curl preforming by the interaction with the curved step portion, the metal lid can be formed smoothly.
[0015]
Furthermore, the fifth press forming step in the metal lid forming method of the present invention includes an inner curl forming means, a die ring for abutting and holding the top surface side of the curl preformed lid, and a center die. A punch assembly corresponding to the die ring, and a punch assembly provided with a center punch corresponding to the center die. The center punch of the punch assembly is It consists of a multi-divided center punch that is equally divided into a plurality of parts in the radial direction and whose outer periphery is surrounded and held by an elastic retaining ring, and the lower end edge of the curl preform is respectively formed on the outer periphery of the multi-divided center punch. An inner curl pressing part for curling inside is provided, and an inner curl corresponding to the inner curl pressing part is provided on the inner peripheral edge of the tip of the punch ring. Are further inserted in the center of the multi-part center punch, and each elastically expands outward in the radial direction, inside the interaction between the inner curl pressing portion and the inner curl recess. By forming the multi-division center punch expanding operation shaft for performing curl molding, the metal lid can be smoothly molded.
[0016]
And the sixth press molding step in the metal lid molding method of the present invention comprises a die ring for abutting and holding the top surface side of the inner curled lid body as a projecting portion molding means, a center die, A punch assembly corresponding to the die ring, and a punch assembly provided with a center punch corresponding to the center die. The center punch of the punch assembly has a radius with respect to the outer periphery thereof. Each of which is divided into a plurality of equal parts and the outer periphery of which is surrounded by an elastic ring and is held by an elastic ring. A fitting protrusion forming protrusion for forming a plurality of fitting protrusions for engaging and locking with the opening edge of the container main body is provided at a part of the narrow diameter portion, and the tip of the punch ring A fitting projection forming recess is provided on the peripheral edge corresponding to the fitting projection forming projection, and is further inserted through the central portion of the multi-divided center punch to elastically expand outward in the radial direction. The metal lid is provided with a multi-divided center punch expanding operation shaft for forming the fitting protrusion by the interaction of the fitting protrusion forming protrusion and the fitting protrusion forming recess. Can be smoothly achieved.
[0017]
On the other hand, a metal lid obtained by the molding method and molding apparatus of the present invention has a circular or polygonal opening at one end, and an annular protrusion that protrudes by curling inwardly at the opening edge. A plurality of metal container main bodies, and a plurality of the metal container main bodies formed by the metal lid main body molding method or the molding apparatus according to any one of the above, and fitted and locked to an annular protrusion provided at an opening edge of the metal container main body. By combining with the metal lid body provided with the fitting protrusions, it is possible to mass-produce metal can containers excellent in fitting locking characteristics, which have been difficult in the past, at low cost.
[0018]
Therefore, an object of the present invention is to continuously and smoothly provide a metal lid provided with a fitting protrusion that can be properly fitted and locked to a container body in a metal can container. An object of the present invention is to provide a metal lid forming method and apparatus and a metal can container that can be mass-produced at low cost.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the metal lid forming method according to the present invention cuts a metal plate into a circular shape or a polygonal shape, and at the same time, a top surface portion of the cover body and a boundary step portion with respect to the top surface portion. A first press-molding step of drawing a cylindrical peripheral wall portion having a slightly larger diameter, respectively,
A second press molding step of preforming a required lower end side of the cylindrical peripheral wall portion of the drawn lid as a small diameter portion for fitting into the opening of the container body;
A third press molding step for appropriately shaping the boundary between the cylindrical peripheral wall portion and the small diameter portion of the preformed lid,
A fourth press-molding step of performing preforming to curl the opening edge of the narrow-diameter portion of the properly shaped lid inward;
A fifth press-molding step of securely curling the opening edge of the narrow-diameter portion of the curl preformed lid inward;
A plurality of fitting protrusions that elastically climb over and engage with an annular protrusion having the opening edge of the container body curled inwardly at a part of the narrow diameter portion of the appropriately shaped lid And a sixth press molding step for molding the material.
[0020]
In this case, the lid body is continuously cut and drawn in the first press forming step, and the second press forming step to the sixth press forming step are performed at the same timing by a common press forming apparatus. The lid can be formed by moving the lid sequentially and continuously.
[0021]
In addition, the plurality of fitting protrusions formed in the sixth press forming step can be provided in a number of three or more at substantially equal intervals in the circumferential direction.
[0022]
Further, the molding apparatus for carrying out the method for molding a metal lid according to the present invention cuts a metal plate into a circular shape or a polygon, and at the same time, the top surface portion of the lid body and a boundary step portion with respect to the top surface portion. Cutting and drawing forming means for drawing a cylindrical peripheral wall portion having a slightly larger diameter, respectively,
Necking preforming means for preforming the required lower end side of the cylindrical peripheral wall portion of the drawn lid as a narrow diameter portion for fitting into the opening of the container body;
Necking shaping means for appropriately shaping the boundary between the cylindrical peripheral wall portion and the small diameter portion of the preformed lid,
A curl preforming means for performing a preforming to curl the opening edge that becomes the tip of the narrow diameter portion of the appropriately shaped lid, on the inside;
An inner curl forming means for securely curling the opening edge of the curl preformed lid inward;
A plurality of fitting protrusions that elastically climb over and engage with an annular protrusion having the opening edge of the container body curled inwardly at a part of the narrow diameter portion of the appropriately shaped lid And a fitting projecting portion forming means for forming the shape.
[0023]
In this case, the cutting / drawing forming means is constituted by a first press forming apparatus, and the necking preforming means, necking shaping means, curl preforming means, inner curl forming means, and fitting projection forming means are shared. The second press forming apparatus is arranged adjacent to the second press forming apparatus in series, and the lid formed by the cutting / drawing forming means of the first press forming apparatus is used as the necking preform of the second press forming apparatus. And a moving means for sequentially moving the lid body from the necking preforming means to the fitting protrusion forming means in accordance with the timing of the press operation of the second press forming apparatus. It can be set as the structure which provided.
[0024]
The cutting / drawing forming means includes a die cutter that cuts a metal plate material forming a lid into a circle or a polygon, a center die that molds a top surface portion of the lid, and a cylindrical shape of the lid between the die cutter and the center die. A die assembly provided with a knockout ring for forming a peripheral wall portion, a punch cutter corresponding to the die cutter, a center punch corresponding to the center die, and a punch assembly provided with a punch ring corresponding to the knockout ring Become
A step forming recess may be provided on the outer peripheral edge of the center die of the die assembly, and a step forming protrusion may be provided in a portion adjacent to the center punch of the punch ring of the punch assembly.
[0025]
Further, the necking preforming means includes a die ring that abuts and holds the top surface side of the lid body that has been cut and drawn, a die assembly provided with a center die, a punch ring corresponding to the die ring, A punch assembly provided with a center punch corresponding to the center die,
The center punch of the punch assembly is set to have an outer diameter smaller than that of the cylindrical peripheral wall portion of the lid body formed by drawing, and at the tip of the punch ring located on the outer periphery of the center punch, It can be set as the structure which provided the necking preforming recessed part which carries out sliding contact | abutting with respect to the lower end part side of a cylindrical surrounding wall part, and preforms the small diameter part for fitting in the opening part of a container main body.
[0026]
Further, the necking shaping means includes: a die ring that abuts and holds the top surface side of the necking preformed lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, A punch assembly provided with a center die and a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery and that surrounds the outer periphery with an elastic holding ring. A necking shaped protrusion is provided on the outer periphery of the part, a necking shaped step is provided on the inner peripheral edge of the tip end of the punch ring, corresponding to the necking shaped protrusion, and is further inserted into the center of the multi-division center punch. A configuration in which a multi-division center punch expanding operation shaft is provided that elastically expands outward in the radial direction and performs necking shaping by the interaction between the necking shaping protrusion and the necking shaping step. It can be.
[0027]
Furthermore, the curl preforming means includes a die ring that abuts and holds the top surface side of the necking shaped lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, A punch assembly provided with a center punch corresponding to the center die,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery of the punch assembly and that surrounds the outer periphery with an elastic retaining ring. A curl pre-formed curved protrusion is provided for pre-curling to curl the lower edge of the necked and shaped lid inward, and corresponds to the curl pre-formed curved protrusion at the inner peripheral edge of the tip of the punch ring Then, a curl preforming curved step portion is provided, and further, the curl preforming curved protrusion and the curl preforming curved portion are elastically expanded outward in the radial direction by being inserted into the center portion of the multi-divided center punch. A multi-division center punch expanding operation shaft that performs curl preforming by interaction with the stepped portion can be provided.
[0028]
Further, the inner curl forming means includes a die assembly that abuts and holds a top surface side of the curl preformed lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, A punch assembly provided with a center die and a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery and that surrounds the outer periphery with an elastic holding ring. An inner curl pressing portion for curling the lower end edge of the curl preformed lid inward is provided, and an inner curl concave portion corresponding to the inner curl pressing portion is provided at the inner peripheral edge of the tip of the punch ring. Are further inserted in the center of the multi-divided center punch and elastically expanded outward in the radial direction, and inner curl molding is performed by the interaction between the inner curl pressing portion and the inner curl recess. It can be set as the structure which provided the multi-division center punch expansion operation shaft to perform.
[0029]
The projecting portion forming means includes a die ring that abuts and holds the top surface side of the inner curled lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, A punch assembly provided with a center die and a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery of the punch assembly and that surrounds the outer periphery with an elastic retaining ring. Forming fitting protrusions for forming a plurality of fitting protrusions that are fitted and locked with the opening edge of the container body on a part of the small diameter portion of the cylindrical peripheral wall portion of the inner curled lid. A protrusion is provided, a fitting protrusion forming recess corresponding to the fitting protrusion forming protrusion is provided at the inner peripheral edge of the tip end of the punch ring, and further inserted into the center of the multi-part center punch. A multi-divided center punch expanding operation shaft is provided that elastically expands outward in the radial direction and forms a fitting protrusion by the interaction between the fitting protrusion forming protrusion and the fitting protrusion forming recess. Can be configured
[0030]
On the other hand, the metal can container according to the present invention has a circular or polygonal opening at one end, and a metal container body provided with an annular protrusion that curls inwardly and protrudes at the opening edge, A plurality of fittings fitted and locked to an annular protrusion provided on an opening edge of the metal container body, formed by the metal lid molding method or molding apparatus according to any one of claims 1 to 11. It is characterized in that it is combined with a metal lid provided with a mating protrusion.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the metal lid forming method and apparatus and metal can container according to the present invention will be described in detail with reference to the accompanying drawings.
[0032]
FIG. 1 and FIG. 2 (a) and FIG. 2 (b) are views showing a combination of a metal lid formed by a metal lid molding method or molding apparatus according to the present invention and a metal container body. An example of a can container is shown. That is, the metal can container 1 shown in FIG. 1 includes a metal lid body 2 and a metal container body 3.
[0033]
However, in the metal can container 1 according to the present embodiment, the metal container body 3 has a circular opening at one end, and an annular protrusion 4 that curls inwardly protrudes at the opening edge. [See (b) of FIG. 2]. On the other hand, the metal lid body 2 includes a top surface portion 5, a cylindrical peripheral wall portion 7 having substantially the same outer diameter as the container body 3 with respect to the top surface portion 5 via a boundary step portion 6, and a lower end portion side thereof. A narrow-diameter portion 8 for fitting into the opening of the container body 3, a curl-molded edge portion 8 a curling the opening edge of the thin-diameter portion 8 inward, and the container on a part of the thin-diameter portion 8 It has a configuration in which a plurality of fitting protrusions 9 that elastically climb over and engage with the annular protrusion 4 formed at the opening edge of the main body 3 are provided (see FIG. 2A).
[0034]
FIG. 3 shows a basic configuration of the molding process or molding means of the method or apparatus for molding the metal lid 2 of the metal can container 1 according to this embodiment. 5 to 9 show schematic configurations of the metal lid body 2 formed by each forming step or forming means. Therefore, the relationship between the forming method or forming means of the metal lid 2 according to the present invention and the forming process or forming means of the forming apparatus and the forming state of the metal lid 2 formed by each forming process or forming means is shown in FIG. This will be described with reference to FIGS.
[0035]
First, when forming the metallic lid 2 according to the present invention, the first press molding step (cutting / drawing forming means) 11 cuts the metal plate material into a circle, and at the same time, the top surface portion 5 of the lid, The cylindrical peripheral wall portion 7 having a slightly larger diameter is drawn through the boundary step portion 6 with respect to the top surface portion 5 (see FIG. 4).
[0036]
Next, a small diameter for fitting the required lower end side of the cylindrical peripheral wall portion 7 of the drawn lid body into the opening of the container body 3 by the second press molding step (necking preforming means) 12. Pre-molded as part 8 (see FIG. 5).
[0037]
Furthermore, the third press molding step (necking shaping means) 13 appropriately shapes the boundary portion between the cylindrical peripheral wall portion 7 and the small diameter portion 8 of the preformed lid body 2 (see FIG. 6). ).
[0038]
Furthermore, the fourth press molding step (curl preforming means) 14 performs preforming for curling the opening edge portion 8a of the narrow-diameter portion 8 of the properly shaped lid 2 inside. (See FIG. 7).
[0039]
Next, the fifth press molding step (inner curl forming means) 15 securely curls the opening edge portion 8a of the narrow-diameter portion 8 of the curl preliminarily formed lid 2 to the curl forming edge. The part is molded (see FIG. 8).
[0040]
Then, by the sixth press molding process (fitting protrusion molding means) 16, the opening edge of the container body 3 is curled inward on a part of the small-diameter portion 8 of the appropriately shaped lid 2. A plurality of fitting protrusions 9 are formed on the annular protrusions 4 to be elastically overcome and locked (see FIG. 9).
[0041]
The lid product 18 molded in this manner is collected sequentially, and has a circular opening at one end, and a metal container provided with an annular protrusion 4 that curls inwardly and projects at the opening edge. By combining with the main body 3, the above-described metal can container 1 can be obtained [see FIG. 1, FIG. 2 (a), (b)].
[0042]
That is, in the present embodiment, in the first press forming step (cutting / drawing forming means) 11, the lid body 2 is continuously cut and drawn, and the second press forming step (necking preliminary forming). Means) From 12 to the sixth press molding step (fitting protrusion molding means) 16, the lid body 2 is sequentially moved at the same timing by a common press molding apparatus to mold the lid body product 18. can do. The plurality of fitting protrusions 9 formed in the sixth press forming step (fitting protrusion forming means) 16 may be provided in a number of three or more at substantially equal intervals in the circumferential direction. it can.
[0043]
Next, a preferred embodiment of a forming apparatus for carrying out the method for forming a metal lid according to the present invention will be described.
[0044]
In the metal lid forming apparatus according to this embodiment, the cutting / drawing forming means 11 is constituted by a first press forming apparatus 20, and the necking pre-forming means 12, necking shaping means 13, curl pre-forming means The forming means 14, the inner curl forming means 15, and the fitting projection forming means 16 are sequentially arranged adjacent to the common second press forming apparatus 22 in series (see FIGS. 3 and 10). Accordingly, a transport means 24 is provided for sequentially transporting the lid body 2 formed by the cutting / drawing forming means 11 of the first press molding apparatus 20 to the necking preforming means 12 of the second press molding apparatus 22. Furthermore, a moving means 26 is provided for moving the lid 2 from the necking preforming means 12 to the fitting protrusion forming means 16 sequentially in accordance with the timing of the press operation of the second press forming device 22. The configuration is used (see FIGS. 3 and 10).
[0045]
FIG. 11 shows the cutting / drawing forming means 11. The cutting / drawing forming means 11 of this embodiment includes a die cutter 32 for cutting a metal plate material forming the lid 2 in a circular shape, a center die 34 for molding the top surface portion 5 of the lid 2, the die cutter 32 and the center die 34, A die assembly 30 provided with a knockout ring 36 for forming the cylindrical peripheral wall portion 7 of the lid body 2 between them, a punch cutter 42 corresponding to the die cutter 32, a center punch 44 corresponding to the center die 34, and the The punch assembly 40 includes a knockout ring 36 and a corresponding punch ring 46.
[0046]
Therefore, in the present embodiment, the die assembly 30 is provided with a step forming recess 34a at the outer peripheral edge of the center die 34, and the punch assembly 40 is adjacent to the center punch 44 of the punch ring 46. It consists of the structure which provided the step part shaping | molding protrusion 46a in the part.
Therefore, according to the cutting / drawing forming means 11 of the present embodiment, as shown in the right half of FIG. 11, the die assembly 30 and the punch assembly 40 are in the state before the press forming operation of the punch assembly 40. In the meantime, the metal plate material is supplied and disposed, and then the punch assembly 40 is press-molded as shown in the left half of FIG. As a result, the metal plate material is cut into a circular shape by the punch cutter 42 and the die cutter 32, and at the same time, the punch ring 46 is inserted into the outer periphery of the center die 34 while pressing the knockout ring 36, and the center punch 44 approaches the center die 34. Thus, the lid body 2 shown in FIG. 4, which includes the top surface portion 5 and the cylindrical peripheral wall portion 7 having a slightly larger diameter with respect to the top surface portion 5 via the boundary step portion 6, can be formed.
[0047]
FIG. 12 shows the necking preforming means 12. The necking preforming means 12 of this embodiment is a die assembly 50 provided with a die ring 52 for abutting and holding the top surface 6 side of the lid 2 formed by the cutting / drawing forming means 11 and a center die 54. And a punch assembly 60 provided with a punch ring 62 corresponding to the die ring 52 and a center punch 64 corresponding to the center die 54. In addition, a cylindrical peripheral wall portion 7 having a slightly larger diameter than the top surface portion 5 of the lid body 2 via the boundary step portion 6 is surrounded and held on the inner peripheral surface portion of the die ring 52 of the die assembly 50. A possible locking step 52a is provided. Reference numeral 56 indicates a cushion spring member of the center die 54.
[0048]
Therefore, in this embodiment, the center punch 64 of the punch assembly 60 is set to have an outer diameter smaller than that of the cylindrical peripheral wall portion 7 of the lid body 2 formed by drawing and positioned on the outer periphery of the center punch 64. Necking that preliminarily molds the narrow-diameter portion 8 to be fitted into the opening of the container body by slidingly abutting against the lower end portion side of the cylindrical peripheral wall portion 7 of the lid body 2 at the distal end portion of the punch ring 62 It has a configuration in which a preformed recess 62a is provided.
[0049]
Therefore, according to the necking preforming means 12 of the present embodiment, as shown in the right half of FIG. 12, the punch assembly 60 is placed on the upper portion of the center die 54 of the die assembly 50 before the press molding operation. The top surface portion 6 side of the lid body 2 formed by the cutting / drawing forming means 11 is placed in contact, and then the punch assembly 60 is press-molded as shown in the left half of FIG. As a result, first, the center punch 64 is inserted into the opening of the lid 2, and then the punch ring 62 is pressed and displaced, so that the container is placed on the opening side (lower end side) of the cylindrical peripheral wall 7 of the lid 2. The lid body 2 shown in FIG. 5 can be molded by preliminarily molding the narrow-diameter portion 8 for fitting into the opening of the main body.
[0050]
FIG. 13 shows the necking shaping means 13. The necking shaping means 13 of this embodiment includes a die assembly 50 provided with a die ring 52 that abuts and holds the top surface portion 5 side of the lid body 2 formed by the necking preforming means 12, and a center die 54. The punch assembly 72 is provided with a punch ring 72 corresponding to the die ring 52 and a center punch 74 corresponding to the center die 54. In the die assembly 50, as in the embodiment shown in FIG. 12, reference numeral 52a indicates a locking step portion 52a of the lid body 2, and 56 indicates a cushion spring member of the center die 54.
[0051]
Therefore, in the present embodiment, the center punch 74 of the punch assembly 70 is divided into a plurality of parts in the radial direction with respect to the outer periphery thereof, and the outer periphery is surrounded by an elastic holding ring 76 so as to be surrounded by an elastic holding ring 76. The necking shaping step 74a is provided on the outer periphery of the multi-part center punch 74 on the tip end side, and the necking shaping step corresponding to the necking shaping projection 74a is provided on the inner peripheral edge of the punch ring 72. A portion 72a is provided, which is inserted and arranged in the center of the multi-divided center punch 74 and elastically expands outward in the radial direction, so that the necking shaping protrusion 74a and the necking shaping step 72a The structure is provided with a multi-divided center punch expanding operation shaft 78 that performs necking shaping by action. In addition, a disc-shaped center core 75 for coming into contact with the top surface portion 5 of the lid body 2 is fitted and attached to the distal end portion of the multi-division center punch 74.
[0052]
Therefore, according to the necking shaping means 13 of this embodiment, as shown in the right half of FIG. 13, the punch assembly 70 is placed on the upper portion of the center die 54 of the die assembly 50 before the press molding operation. The top surface portion 5 side of the lid body 2 formed by the necking preforming means 12 is placed in contact, and then the punch assembly 70 is press-molded as shown in the left half of FIG. As a result, first, the multi-division center punch 74 is inserted into the opening of the lid body 2, and then the punch ring 72 is pressed and displaced, and the multi-division center punch 74 has a radius due to the press displacement of the multi-division center punch expanding operation shaft 78. The lid shown in FIG. 6 is formed by necking the boundary portion between the cylindrical peripheral wall portion 7 of the lid body 2 and the narrow-diameter portion 8 on the opening side (lower end side) thereof by expanding outward in the direction. The body 2 can be molded.
[0053]
FIG. 14 shows the curl preforming means 14. The curl preforming means 14 of this embodiment is a die assembly provided with a die ring 52 that abuts and holds the top surface portion 5 side of the lid body 2 that has been necked by the necking shaping means 13, and a center die 54. 50, a punch ring 82 corresponding to the die ring 52, and a punch assembly 80 provided with a center punch 84 corresponding to the center die 54. In the die assembly 50, as in the embodiment shown in FIG. 12, reference numeral 52a indicates a locking step portion 52a of the lid body 2, and 56 indicates a cushion spring member of the center die 54.
[0054]
Therefore, in the present embodiment, the center punch 84 of the punch assembly 80 is divided into a plurality of parts in the radial direction with respect to the outer periphery, and the outer periphery is surrounded by an elastic holding ring 86 so as to be surrounded by an elastic holding ring 86. The punch ring 82 is provided with a curl preforming curved protrusion 84a for preforming to curl the lower end edge of the lid body 2 that is necked and shaped on the outer periphery of the multi-divided center punch 84. A curl preformed curved step portion 82a is provided on the inner peripheral edge of the tip corresponding to the curl preformed curved protrusion 84a, and is further inserted into the center of the multi-divided center punch 84 so as to be elastic outward in the radial direction. And the curl pre-shaped curve protrusion 84a and the curl pre-shaped curve step 82a are likely to perform the pre-curl molding. Consisting structure in which a center punch expanding actuation shaft 88. A disc-shaped center core 85 for contacting the top surface portion 5 of the lid 2 is fitted and attached to the tip of the multi-divided center punch 84.
[0055]
Therefore, according to the curl preforming means 14 of the present embodiment, as shown in the right half of FIG. 14, in the state before the press molding operation of the punch assembly 80, the die assembly 50 is placed above the center die 54. The top surface part 5 side of the lid body 2 formed by the necking shaping means 13 is placed in contact with it, and then the punch assembly 80 is press-molded as shown in the left half of FIG. As a result, first, the multi-division center punch 84 is inserted into the opening of the lid 2, and then the punch ring 82 is pressed and displaced, and the multi-division center punch 84 is radiused by the press displacement of the multi-division center punch expansion operation shaft 88. By performing the expanding operation outward in the direction, it is possible to perform the molding of the lid body 2 shown in FIG. 7 in which the opening edge portion (lower end edge portion) 8a of the narrow-diameter portion 8 of the lid body 2 is preliminarily curled.
[0056]
FIG. 15 shows the inner curl forming means 15. The inner curl forming means 15 of the present embodiment is a die assembly provided with a die ring 52 that abuts and holds the top surface portion 5 side of the lid body 2 that has been curled preformed by the curl preforming means 14 and a center die 54. 50, a punch ring 92 corresponding to the die ring 52, and a punch assembly 90 provided with a center punch 94 corresponding to the center die 54. In the die assembly 50, as in the embodiment shown in FIG. 12, reference numeral 52a indicates a locking step portion 52a of the lid body 2, and 56 indicates a cushion spring member of the center die 54.
[0057]
Therefore, in the present embodiment, the center punch 94 of the punch assembly 90 is equally divided into a plurality of parts in the radial direction with respect to the outer periphery, and the outer periphery is surrounded by the elastic holding ring 96 so as to be surrounded by the multi-division center punch 94. An inner curl pressing portion 94a for curling the lower end edge 8a of the curled preform 2 on the outer periphery of the multi-divided center punch 94, and the inner peripheral edge of the tip end of the punch ring 92. The inner curl pressing part 94a is provided with an inner curl pressing recess 92a corresponding to the inner curl pressing part 94a, and is further inserted through the central part of the multi-divided center punch 94 so as to be elastically expanded radially outward. Multi-segment center punch expansion operation system for performing inner curl molding by the interaction between the inner curl pressing portion 94a and the inner curl recess 92a. Consisting structure in which a shift 98. A disc-shaped center core 95 for contacting the top surface portion 5 of the lid 2 is fitted and attached to the tip of the multi-division center punch 94.
[0058]
Therefore, according to the inner curl forming means 15 of the present embodiment, as shown in the right half of FIG. 15, the punch assembly 90 is placed on the upper portion of the center die 54 of the die assembly 50 before the press forming operation. The top surface portion 5 side of the lid body 2 formed by the curl preforming means 14 is placed in contact, and then the punch assembly 90 is press-molded as shown in the left half of FIG. As a result, first, the multi-division center punch 94 is inserted into the opening of the lid 2, and then the multi-division center punch 94 is expanded outward in the radial direction by the pressing displacement of the multi-division center punch expansion operation shaft 98. Further, by pressing and displacing the punch ring 92, the opening 2 (lower end edge) 8a of the narrow-diameter portion 8 of the lid 2 is subjected to inner curl molding, and the lid 2 shown in FIG. 8 can be molded. .
[0059]
FIG. 16 shows the protrusion forming means 16. The projecting portion forming means 16 of this embodiment is a die assembly provided with a die ring 52 that abuts and holds the top surface portion 5 side of the lid body 2 that has been subjected to inner curl molding by the inner curl forming means 15, and a center die 54. 50, a punch ring 102 corresponding to the die ring 52, a center punch 104 corresponding to the center die 54, and a punch assembly 100 provided with an outer punch ring 101 for the punch ring 102. In the die assembly 50, as in the embodiment shown in FIG. 12, reference numeral 52a indicates a locking step portion 52a of the lid body 2, and 56 indicates a cushion spring member of the center die 54.
[0060]
Therefore, in this embodiment, the center punch 104 of the punch assembly 100 is equally divided into a plurality of parts in the radial direction with respect to the outer periphery, and the outer periphery is surrounded by the elastic holding ring 106 so as to be surrounded by the multi-division center punch 104. And a plurality of small-diameter portions 8 of the cylindrical peripheral wall portion of the lid body 2 that are respectively curled inside on the outer periphery of the multi-divided center punch 104, and are fitted and locked to the opening edge of the container body. A fitting protrusion forming protrusion 104a for forming the fitting protrusion 9 is provided, and a fitting protrusion forming recess corresponding to the fitting protrusion forming protrusion 104a is provided on the inner peripheral edge of the tip of the punch ring 102. 102a, and further inserted into the center of the multi-divided center punch 100 and elastically expanded outward in the radial direction, and the fitting projection forming projection 104a and the fitting projection Consisting structure in which a multi-division center punch expanding actuation shaft 108 for molding the engaging protrusion 9 from the interaction of the shape recess 102a. A disc-shaped center core 105 for abutting the top surface portion 5 of the lid 2 is fitted and attached to the tip of the multi-division center punch 104.
[0061]
Therefore, according to the protruding portion forming means 16 of the present embodiment, as shown in the right half of FIG. 16, the punch assembly 100 is placed on the upper portion of the center die 54 of the die assembly 50 before the press forming operation. The top surface 5 side of the lid body 2 formed by the inner curl forming means 15 is placed in contact with the lid 2, and then the punch assembly 100 is press-molded as shown in the left half of FIG. As a result, first, the multi-divided center punch 104 is inserted into the opening of the lid 2, and then the punch ring 102 is pressed and displaced. By performing the expanding operation outward in the direction, the lid body 2 shown in FIG. 9 in which the fitting protrusion 9 is formed on a part of the small diameter portion 8 of the lid body 2 can be formed.
[0062]
In this embodiment, a conical protruding surface 102b is formed on the outer peripheral portion of the tip of the punch ring 102. On the other hand, the conical protrusion of the punch ring 102 is formed on the tip of the outer punch ring 101 correspondingly. A conical recess surface 101a corresponding to the surface 102b is provided and slidably contacted. That is, with this configuration, when the punch ring 102 abuts the corresponding die ring 52 in the press molding operation of the punch assembly 100 described above, the pressing action of the outer punch ring 101 is It acts on the conical protrusion surface 102b of the punch ring 102 via the conical recess surface 101a, and presses the punch ring 102 from the outer peripheral direction to the inner peripheral direction as indicated by an arrow. Such a pressing operation of the punch ring 102 is opposed to the above-described operation in which the multi-divided center punch 104 is expanded outward in the radial direction due to the press displacement of the multi-divided center punch expanding operation shaft 108. The molding of the fitting protrusion 9 with respect to the diameter portion 8 can be made more reliable.
[0063]
FIGS. 17 to 19 show the detailed structure of an embodiment of the multi-division center punch 104 of the punch assembly 100 in the protrusion forming means 16 described above. That is, in FIG. 17 to FIG. 19, the multi-division center punch 104 is constituted by, for example, center punch division bodies 103A, 103B, 103C, 103D, 103E, and 103F that are equally divided into six in the radial direction with respect to the outer periphery. Yes. And these center punch division | segmentation bodies 103A-103F engrave the elastic holding ring latching groove 104b in the outer peripheral part, and wind and mount the elastic holding ring 106 which consists of a coil spring in this latching groove 104b, A multi-division center punch 104 is formed. In addition, a disc-shaped center core 105 for coming into contact with the top surface portion 5 of the lid 2 can be fitted and attached to the lower end portion of the multi-division center punch 104. Further, a central hole 107 having a taper portion 107 a that expands upward is provided in the central portion of the multi-divided center punch 104, and a corresponding central hole 109 is also provided in the central portion of the center core 105. The center punch divided bodies 103 </ b> A to 103 </ b> E are each provided with a positioning hole 111 parallel to the center hole 109 and a plurality of positioning holes 112 corresponding to the center core 105.
[0064]
The basic configuration of the multi-division center punch 104 described above is similarly applied to the basic configurations of the multi-division center punches 74, 84, and 94 shown in FIGS.
[0065]
In the multi-division center punch 104 of the present embodiment, a fitting projection forming projection 104a is provided for any or all of the center punch division bodies 103A to 103F as shown in the figure. As shown in FIG. 19, the multi-divided center punch 104 configured in this way is attached to the lid body 2 placed in contact with the upper portion of the center die 54 (see FIG. 16) of the die assembly 50 (see FIG. 16). On the other hand, the multi-divided center punch 104 is inserted into the opening of the lid body 2, and then the punch ring 102 (see FIG. 16) is pressed and displaced, so that the multi-divided center punch expanding operation shaft 108 is moved to the center of the multi-divided center punch 104. By pressing and displacing with respect to the hole 107, the center punch divided bodies 103A to 103E of the multi-divided center punch are expanded outward in the radial direction to be provided on the fitting protrusion forming protrusion 104a and the punch ring 102. The fitting protrusion 9 can be formed on a part of the small-diameter portion 8 of the lid 2 by the interaction with the fitting protrusion forming recess 102a (see FIG. 16).
[0066]
Therefore, by applying the protrusion forming means 16 having the punch assembly 100 having the multi-division center punch 104 having the above-described configuration, the metal lid according to the present invention as shown in FIG. 20 is formed. It can be achieved easily and simply.
[0067]
In the embodiment described above, the method and apparatus for forming a metal lid for a cylindrical can container having a top surface portion or the like formed in a circle have been described. However, the metal lid according to the present invention is not limited to this. The molding method and the molding apparatus can not only target a cylindrical can container having a top surface portion or the like formed in an elliptical shape or an eccentric circular shape. For example, as shown in FIG. 21 and FIG. The polygonal cylindrical can container formed into a square shape can also be applied by slightly changing the design and the like.
[0068]
That is, the embodiment shown in FIG. 21 shows a cylindrical can container in which the top surface portion and the like are formed in a square shape. In FIG. 21, for convenience of explanation, the same reference numerals are given to the same components as those in the embodiment shown in FIGS. 1 and 2 (a) and (b), and the detailed description thereof will be given. Omitted. Accordingly, in the embodiment of FIG. 21, reference numeral 1 is a metal can container, 2 is a metal lid, and 3 is a metal container body. Reference numeral 4 is a quadrangular annular protrusion of the container body 3, 5 is a quadrangular top surface portion of the lid 2, 6 is a boundary step portion, 7 is a quadrangular cylindrical peripheral wall portion, and 8 is The narrow-diameter portion, 8a is an opening edge (curl molding edge), and 9 is a fitting protrusion.
[0069]
Moreover, in the Example shown in FIG. 22, the cylindrical can container which formed the top surface part etc. in octagon shape is shown. In FIG. 22 as well, for convenience of explanation, the same components as those in the embodiment shown in FIG. 1 and FIG. Is omitted. Accordingly, in the embodiment of FIG. 22, reference numeral 1 is a metal can container, 2 is a metal lid, and 3 is a metal container body. Reference numeral 4 is an octagonal annular protrusion of the container body 3, 5 is an octagonal top surface portion of the lid 2, 6 is a boundary step portion, 7 is an octagonal cylindrical peripheral wall portion, and 8 is The narrow-diameter portion, 8a is an opening edge (curl molding edge), and 9 is a fitting protrusion.
[0070]
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments. For example, the shape of the top surface portion, the boundary step portion, the cylindrical peripheral wall portion, etc. It is possible to change the dimensions and the like, and to change the shape and dimensions of the container body conforming thereto, and various design changes can be made without departing from the spirit of the present invention.
[0071]
【The invention's effect】
As is apparent from the above-described embodiment, according to the metal lid forming method of the first aspect of the present invention, the fitting that can be properly fitted and locked to the container body of the metal can container. The metal lid provided with the joint protrusion can be mass-produced continuously and smoothly and at low cost. According to the method for forming a metal lid according to claim 2, the second press forming step to the sixth press forming step are sequentially and continuously performed at the same timing by a common press forming device. Therefore, the metal lid can be efficiently formed. Furthermore, according to the metal lid forming method of the third aspect, it is possible to appropriately achieve the formation of the fitting protrusion for fitting and locking with the container body.
[0072]
On the other hand, according to the metal lid forming apparatus according to claim 4 of the present invention, the metal provided with the fitting protrusion that can be properly fitted and locked to the container body of the metal can container. The apparatus can be easily realized by smoothly mass-producing the lid-making body with a simple configuration. According to the metal lid forming apparatus of claim 4, there is provided an apparatus for forming a metal lid efficiently and sequentially at the same timing using a common press forming apparatus. Can be realized. Furthermore, the metal lid forming device according to any one of claims 6 to 11 can continuously and smoothly form the metal lid from the first press forming step to the sixth press forming step. In addition, a molding apparatus that can be mass-produced at low cost can be obtained.
[0073]
And according to the metal can container of Claim 12 of this invention, by obtaining the metal lid body which provided the fitting protrusion part which has the characteristic mentioned above, this metal lid body and metal container main body In combination with the above, it is possible to easily obtain a highly convenient metal can container that can be properly fitted and locked to each other, which has been difficult in the past.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a metal can container made of a combination of a metal lid formed by a forming method or a forming apparatus according to the present invention and a container container.
2A is a cross-sectional side view of a main part of a metal lid in the metal can container shown in FIG. 1, and FIG. 2B is a cross-sectional side view of a main part of a container body in the metal can container shown in FIG. is there.
FIG. 3 is a block system explanatory diagram showing a schematic system (schematic configuration) of each forming step (forming means) of the metal lid forming method (forming apparatus) according to the present invention.
FIG. 4 is a cross-sectional side view of a lid body molded by a first press molding step (cutting / drawing means) in the metal lid body molding method (molding apparatus) according to the present invention.
FIG. 5 is a cross-sectional side view of a lid body formed by a second press forming step (necking preforming means) in the metal lid body forming method (forming apparatus) according to the present invention.
FIG. 6 is a cross-sectional side view of a lid body molded by a third press molding step (necking shaping means) in the metal lid body molding method (molding apparatus) according to the present invention.
FIG. 7 is a cross-sectional side view of a lid body molded by a fourth press molding step (curl preforming means) in the metal lid body molding method (molding apparatus) according to the present invention.
FIG. 8 is a cross-sectional side view of a lid body molded by a fifth press molding step (inner curl molding means) in the metal lid body molding method (molding apparatus) according to the present invention.
FIG. 9 is a cross-sectional side view of a lid body formed by a sixth press molding step (fitting protrusion forming means) in the metal lid body molding method (molding apparatus) according to the present invention.
FIG. 10 is an explanatory view showing an example of a layout (configuration arrangement) of a forming step (forming means) of a forming method (forming apparatus) for a metal lid.
11 is a cross-sectional side view of an essential part showing one embodiment of cutting / drawing forming means as a first press forming step for forming the metal lid shown in FIG. 4; FIG.
12 is a cross-sectional side view of an essential part showing one embodiment of necking preforming means as a second press forming step for forming the metal lid shown in FIG. 5. FIG.
13 is a cross-sectional side view of an essential part showing one embodiment of necking shaping means as a third press forming step for forming the metal lid shown in FIG. 6. FIG.
14 is a cross-sectional side view of an essential part showing one embodiment of a curl preforming means as a fourth press forming step for forming the metal lid shown in FIG. 7. FIG.
15 is a cross-sectional side view of an essential part showing one embodiment of an inner curl forming means as a fifth press forming step for forming the metal lid shown in FIG. 8. FIG.
16 is a cross-sectional side view of an essential part showing one embodiment of a fitting protrusion forming means as a sixth press forming step for forming the metal lid shown in FIG. 9. FIG.
17 is a schematic perspective view of a main part of a multi-division center punch of the fitting protrusion forming means shown in FIG.
18 is a schematic perspective view showing a single center punch divided by the multi-division center punch shown in FIG.
19 is a schematic sectional side view of the multi-segment center punch shown in FIG.
20 is a cross-sectional side view of a metal lid formed by the multi-division center punch shown in FIG.
FIG. 21 is a schematic perspective view showing another embodiment of a metal can container formed of a combination of a metal lid body and a container container formed by the forming method or forming apparatus according to the present invention.
FIG. 22 is a schematic perspective view showing another embodiment of a metal can container comprising a combination of a metal lid body and a container container formed by the forming method or forming apparatus according to the present invention.
[Explanation of symbols]
1 Metal can container
2 Metal lid
3 Metal container body
4 annular protrusion
5 Top part
6 Boundary steps
7 Cylindrical peripheral wall
8 Small diameter part
8a Open edge (curled edge)
9 Mating protrusion
11 First press molding process (cutting / drawing means)
12 Second press molding process (necking preforming means)
13 Third press molding process (necking shaping means)
14 Fourth press molding process (curl preforming means)
15 Fifth press molding process (inner curl molding means)
16 Sixth press molding process (fitting protrusion part forming means)
18 Lid products
20 First press molding apparatus
22 Second press molding apparatus
24 Conveying means
26 Transfer means
30 die assembly
32 die cutter
34 Center die
34a Stepped recess
36 Knockout Ring
40 Punch assembly
42 Punch cutter
44 Center punch
46 Punch Ring
46a Step forming protrusion
50 die assembly
52 Die Ring
52a Locking step
54 Center die
56 Spring member for cushion
60 Punch assembly
62 Punch Ring
62a Necking preformed recess
64 Center punch
70 Punch assembly
72 Punch Ring
72a Necking shaped step
74 Multi-segment center punch
74a Necking shaped projection
75 Center core
76 Elastic retaining ring
78 Multiple split center punch expansion shaft
80 Punch assembly
82 Punch Ring
82a curl preformed curved step
84 Multi-division center punch
85 Center core
84a Curl Pre-formed Curved Projection
86 Elastic retaining ring
88 Multi-segment center punch expansion operation shaft
90 Punch assembly
92 Punch Ring
92a Inner curl molding recess
94 Multi-segment center punch
94a Inner curl pressing part
95 Center core
96 Elastic retaining ring
98 Multi-segment center punch expansion operation shaft
100 punch assembly
101 Outer punch ring
101a Conical concave surface
102 Punch ring
102a Mating protrusion molding recess
102b Conical protruding surface
103A-103F Center punch divided body
104 Multi-center punch
104a Mating protrusion molding protrusion
104b Elastic retaining ring locking groove
105 Center core
106 Elastic retaining ring
107 Center hole of multi-division center punch
107a taper part
108 Multi-division center punch expansion operation shaft
109 Center core center hole
111 Positioning hole of center punch divided body
112 Center core positioning hole

Claims (12)

The first press molding that draws the top surface portion of the lid body and the cylindrical peripheral wall portion having a slightly larger diameter with respect to the top surface portion through a boundary step portion at the same time as cutting the metal plate material into a circle or a polygon. Process,
A second press molding step of preforming a required lower end side of the cylindrical peripheral wall portion of the drawn lid as a small diameter portion for fitting into the opening of the container body;
A third press molding step for appropriately shaping the boundary between the cylindrical peripheral wall portion and the small diameter portion of the preformed lid,
A fourth press-molding step of performing preforming to curl the opening edge of the narrow-diameter portion of the properly shaped lid inward;
A fifth press-molding step of securely curling the opening edge of the narrow-diameter portion of the curl preformed lid inward;
A plurality of fitting protrusions that elastically climb over and engage with an annular protrusion having the opening edge of the container body curled inwardly at a part of the narrow diameter portion of the appropriately shaped lid A sixth press molding step of molding
A method for forming a metal lid, comprising: The lid is continuously cut and drawn in the first press molding process, and the second press molding process to the sixth press molding process are sequentially performed at the same timing by a common press molding apparatus. The method for forming a metal lid according to claim 1, wherein the lid is molded by moving the lid in general. 3. The metal-made metal according to claim 1, wherein the plurality of fitting protrusions formed in the sixth press forming step are provided in a number of three or more at substantially equal intervals in the circumferential direction. A method for forming a lid. Cutting and drawing forming means for drawing a metal plate material into a circular shape or a polygon shape, and simultaneously drawing the top surface portion of the lid and a cylindrical peripheral wall portion having a slightly larger diameter with respect to the top surface portion via a boundary step portion. When,
Necking preforming means for preforming the required lower end side of the cylindrical peripheral wall portion of the drawn lid as a narrow diameter portion for fitting into the opening of the container body;
Necking shaping means for appropriately shaping the boundary between the cylindrical peripheral wall portion and the small diameter portion of the preformed lid,
A curl preforming means for performing a preforming to curl the opening edge that becomes the tip of the narrow diameter portion of the appropriately shaped lid, on the inside;
An inner curl forming means for securely curling the opening edge of the curl preformed lid inward;
A plurality of fitting protrusions that elastically climb over and engage with an annular protrusion having the opening edge of the container body curled inwardly at a part of the narrow diameter portion of the appropriately shaped lid Fitting protrusion forming means for forming
An apparatus for forming a metal lid, comprising: The cutting / drawing forming means is constituted by a first press forming apparatus, and the necking pre-forming means, necking shaping means, curl pre-forming means, inner curl forming means, and fitting protrusion forming means are common second. The lid formed by the cutting / drawing forming means of the first press forming apparatus is sequentially arranged to the necking pre-forming means of the second press forming apparatus. Conveying means for conveying is provided, and further, moving means for sequentially moving the lid from the necking preforming means to the fitting protrusion forming means in accordance with the timing of the press operation of the second press molding apparatus is provided. The metal lid forming apparatus according to claim 4, wherein the metal lid body is formed. The cutting / drawing forming means includes a die cutter that cuts a metal plate material forming a lid into a circle or a polygon, a center die that molds a top surface portion of the lid, and a cylindrical shape of the lid between the die cutter and the center die. A die assembly provided with a knockout ring for forming a peripheral wall portion, a punch cutter corresponding to the die cutter, a center punch corresponding to the center die, and a punch assembly provided with a punch ring corresponding to the knockout ring Become
The step forming recess is provided at the outer peripheral edge of the tip end of the center die of the die assembly, and the step forming protrusion is provided at a portion adjacent to the center punch of the punch ring of the punch assembly. The metal lid forming apparatus according to 4 or 5. The necking preliminary forming means includes a die assembly that includes a die ring that abuts and holds the top surface side of the cut and drawn lid, a die assembly that includes a center die, a punch ring that corresponds to the die ring, and the center die. And a punch assembly provided with a corresponding center punch,
The center punch of the punch assembly is set to have an outer diameter smaller than that of the cylindrical peripheral wall portion of the lid body formed by drawing, and at the tip of the punch ring located on the outer periphery of the center punch, The necking preforming recessed part which carries out sliding contact | abutting with respect to the lower end part side of a cylindrical surrounding wall part, and pre-forms the thin diameter part for fitting in the opening part of a container main body is provided. The metal lid forming apparatus as described. The necking shaping means includes a die assembly that abuts and holds a top surface portion side of a necking preformed lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, and the center die. A punch assembly provided with a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery and that surrounds the outer periphery with an elastic holding ring. Necking shaping protrusions are provided on the outer sides of the punch ring, necking shaping steps corresponding to the necking shaping protrusions are provided on the inner peripheral edge of the tip of the punch ring, and inserted into the center of the multi-division center punch. A multi-division center punch expansion operating shaft that is arranged and elastically expands outward in the radial direction and performs necking shaping by the interaction between the necking shaping protrusion and the necking shaping step is provided. The metal lid forming apparatus according to claim 4 or 5, characterized in that: The curl preforming means includes: a die ring that abuts and holds the top surface side of the necked shaped lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, and the center die. A punch assembly provided with a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery of the punch assembly and that surrounds the outer periphery with an elastic retaining ring. A curl pre-formed curved protrusion is provided for preforming to curl the lower end edge of the necked and shaped lid, and the curl pre-formed curved protrusion corresponds to the inner peripheral edge of the tip of the punch ring. Then, a curl preforming curved step portion is provided, and further, the curl preforming curved protrusion and the curl preforming curved portion are elastically expanded outward in the radial direction by being inserted into the center portion of the multi-divided center punch. 6. A metal lid according to claim 4, wherein a multi-division center punch expanding operation shaft for performing curl preforming by interaction with the stepped portion is provided. Molding apparatus. The inner curl forming means includes: a die ring that abuts and holds a top surface side of the curl preformed die, a die assembly provided with a center die, a punch ring corresponding to the die ring, and the center die. A punch assembly provided with a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery of the punch assembly and that surrounds the outer periphery with an elastic retaining ring. An inner curl pressing portion is provided for curling the lower end edge of the curled preformed lid inward, and an inner curl concave portion corresponding to the inner curl pressing portion on the inner peripheral edge of the punch ring. Are further inserted in the center of the multi-divided center punch and elastically expanded outward in the radial direction, and the inner curl is formed by the interaction between the inner curl pressing portion and the inner curl recess. 6. The metal lid forming apparatus according to claim 4, further comprising a multi-division center punch expanding operation shaft. The projecting portion forming means includes a die assembly that abuts and holds the top surface side of the inner curled lid, a die assembly provided with a center die, a punch ring corresponding to the die ring, and the center die. A punch assembly provided with a corresponding center punch,
The center punch of the punch assembly is composed of a multi-part center punch that is equally divided into a plurality of parts in the radial direction with respect to the outer periphery of the punch assembly and that surrounds the outer periphery with an elastic retaining ring. Forming fitting protrusions for forming a plurality of fitting protrusions that are fitted and locked with the opening edge of the container body on a part of the small diameter portion of the cylindrical peripheral wall portion of the inner curled lid. A protrusion is provided, a fitting protrusion forming recess corresponding to the fitting protrusion forming protrusion is provided at the inner peripheral edge of the tip end of the punch ring, and further inserted into the center of the multi-part center punch. A multi-divided center punch expanding operation shaft is provided that elastically expands outward in the radial direction and forms a fitting protrusion by the interaction between the fitting protrusion forming protrusion and the fitting protrusion forming recess. Claims Or 5 forming apparatus metallic lid according. A metal container body having a circular or polygonal opening at one end, and an annular protrusion that curls inwardly and protrudes at the opening edge;
A plurality of fittings fitted and locked to an annular protrusion provided on an opening edge of the metal container body, formed by the metal lid molding method or molding apparatus according to any one of claims 1 to 11. A metal lid provided with a mating protrusion;
A metal can container characterized by combining the above.

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