JP2003320432A - Apparatus and method for manufacturing metallic bottle can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing a metallic bottle can, by which holding position of a bottomed cylindrical body on a workpiece holder is stabilized so that the height of a screw thread formed on a bottle can be made constant. <P>SOLUTION: The method includes a pressing process in which the bottomed cylindrical body W is pressed against a die ring 22 just before screw formation working. The bottomed cylindrical body is formed into the metallic bottle can in a state that the bottom part of the bottomed cylindrical body W is held on the die ring 22. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal bottle can by molding a bottomed tubular body while holding the bottom of the cylindrical body on a die ring, and a manufacturing apparatus for the metal bottle can.

[0002]

2. Description of the Related Art Generally, a metal bottle can (hereinafter referred to as a bottle can) is drawn or ironed (i) on a metal plate made of aluminum or an aluminum alloy.
It is formed by performing processing such as roning) in multiple stages and is widely used as a container for beverages.

The manufacturing apparatus is provided with a work holding part for holding a bottomed tubular body formed from a metal plate, and a tool holding part for holding a processing tool for forming the bottomed tubular body. The bottomed tubular bodies are annularly arranged and held on the disc surface, while the processing tools are annularly arranged and held on the disc surface so as to face the bottomed tubular bodies. .

The bottomed tubular body is held with its opening facing the tool holding portion in axial alignment with the work holding portion and the tool holding portion. In the tool holder, as a processing tool, a large number of drawing dies for reducing the diameter of the opening of the cylindrical body to form the taper portion and the mouthpiece portion (neck-in processing) and forming a screw shape in the mouthpiece portion are formed. Various tools (tools) for performing processing according to each processing stage, such as screw forming tools, curl processing tools that form curls at the open ends, etc.
Is provided, and each tool is arranged in the order of steps.

As a processing step applied to the bottomed cylindrical body, a neck-in processing step for reducing the diameter of the opening in multiple stages, a shape of a mouthpiece part formed by the neck-in processing are adjusted, and the height is adjusted. There is a trimmer process for aligning, a screw forming process for forming a screw shape on the die, a curl forming process for bending the tip of the die outward, a curl crimping process for crushing the curl, etc. .

Further, the work holding portion and the tool holding portion are rotatable relative to each other and can move back and forth in the axial direction, and when the work holding portion and the tool holding portion approach each other, the respective tools are Processing according to the process is performed on the bottomed tubular body, and when the two devices are separated from each other, the two devices relatively rotate so that the tool of the next process faces each tubular body. In this way, by repeating the operation that both devices approach each other and rotate, the tapered portion, the base portion, the screw shape, etc. are sequentially formed on the bottomed tubular body, and the shape as a bottle can is formed. Will be given.

The bottle can thus formed is filled with contents and then sealed by a cap attached to the mouthpiece. The cap is mounted by deforming a cup-shaped cap material made of aluminum or aluminum alloy so as to follow the shape of the mouthpiece. The deformation (tightening) of the cap material is generally performed by rotating (rolling) a disk-shaped roller in a state of being pressed against the outer peripheral surface of the cap material.

The roller is biased upward (toward the tip of the bottle) and first comes into contact with the upper portion of the mouthpiece to start rolling. When the roller comes into contact with the upper end of the thread of the cap while the roller is rotating on the outer peripheral surface of the cap member, the roller is guided by this thread shape and enters the thread groove from the upper end of the screw and rolls to the lower end of the thread groove. As a result, a screw shape is formed on the cap member, and the cap is attached to the mouthpiece portion of the bottle can.

[0009]

When the cap is attached to the bottle can manufactured by the manufacturing apparatus as described above by the above-mentioned method, the cap is surely secured unless the height of the upper end of the screw thread of the base is constant. There is a risk of winding failure that cannot be attached. That is, when the cap is mounted, the screw forming roller cannot contact the upper end of the screw thread, so that the screw shape cannot be formed simply by rolling the upper part of the cap material. It is impossible to form a desired screw shape on the cap material, for example, the screw thread of the cap portion is crushed by being pressed onto the screw thread of the material. Therefore, it is necessary to make the height of the upper end portion of the screw thread of the mouthpiece part constant.

To solve this problem, a screw forming process for forming a screw shape on the mouthpiece of a bottle can is performed between the work holding portion holding the bottomed tubular body and the screw forming tool of the tool holding portion. Since it is performed by positioning, it is important to hold the bottomed cylindrical body at an accurate position with respect to the work holding portion. However, in the neck-in processing step that is performed prior to the screw forming processing, the taper portion and the mouthpiece portion having the reduced diameter are pulled toward the tool holding portion side as the drawing die is released. There is a problem that the holding position of the bottomed tubular body with respect to the work holding portion varies.

The present invention has been made in view of the above problems, and an object of the present invention is to stabilize the holding position of the bottomed tubular body with respect to the work holding portion and to make the height of the thread formed on the bottle can constant. To do.

[0012]

In order to solve the above-mentioned problems, in the method for manufacturing a metal bottle can according to the invention of claim 1, the bottom of the bottomed tubular body is held by a die ring,
A method for manufacturing a metal bottle can by molding this bottomed tubular body, characterized by having a pressing step of pressing the bottomed tubular body against the die ring immediately before the screw forming process. . According to this invention, by pressing the bottomed tubular body against the die ring immediately before the screw forming process,
The screw forming process can be performed with the bottomed tubular body held at a predetermined position. Therefore, the height of the thread formed on the bottle can becomes constant, and it becomes possible to manufacture a metal bottle can in which winding failure is unlikely to occur.

According to a second aspect of the present invention, there is provided a metal bottle can manufacturing apparatus including a die ring for holding a bottom portion of a bottomed tubular body,
A manufacturing device for a metal bottle can, which comprises a screw forming tool for molding a screw shape in a mouthpiece part formed in the opening of a bottomed tubular body, and which molds a bottomed tubular body into a bottle can, The screw forming tool has an elastic member that faces the opening of the bottomed tubular body and is relatively movable in the axial direction, and is pressed against the bottomed tubular body by the axial movement. I am trying. According to the present invention, the bottomed tubular body can be placed at a predetermined position by pressing the bottomed tubular body against the die ring during the screw forming process by the screw forming tool. Therefore, the holding position of the bottomed tubular body is stable, the screw shape can be stably formed at a predetermined position of the mouthpiece portion, and it is possible to manufacture a metal bottle can that is less likely to cause winding failure.

According to a third aspect of the present invention, there is provided a metal bottle can manufacturing apparatus including a die ring for holding a bottom portion of a bottomed tubular body,
A metal bottle comprising a tool holding part having a plurality of forming tools for forming a bottomed tubular body into various shapes, and sequentially processing the bottomed tubular body by each forming tool provided in the tool holding part. A device for molding a can,
As a forming tool, a screw forming tool for forming a screw shape on a mouthpiece formed in a bottomed tubular body, and a pressing tool for pressing the bottomed tubular body against the die ring,
The pressing tool is characterized in that it is arranged to operate in front of the thread forming tool. According to this invention, since the pressing tool presses the bottomed tubular body against the die ring before the screw forming process by the screw forming tool, the bottomed tubular body is held at a predetermined position during the screw forming process. Then, a screw shape can be formed at a predetermined position of the bottomed tubular body. Therefore, it is possible to manufacture a metal bottle can in which a screw shape is formed at a predetermined position and winding failure is less likely to occur.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, in the drawing, reference numeral 10
An apparatus for manufacturing a bottle can B for forming the bottomed tubular body W formed from a metal plate into a bottle can shape will be described. The bottle can B manufactured by the manufacturing apparatus 10 is for containing carbonated drinks, fruit juice drinks, and the like, is formed from a thin metal plate of aluminum or aluminum alloy, and has a smaller diameter than the body of the can and has a screw shape. The cap is attached to the mouthpiece to be hermetically sealed.

The manufacturing apparatus 10 includes a work holding section 20 for holding a bottomed tubular body (work) W formed from a metal plate,
A tool holding unit 30 that holds a processing tool 32 for forming the bottomed tubular body W and a drive unit 12 that drives these holding units 20 and 30 are provided. And the tool holding side are opposed to each other, and the work W is processed by the processing tool 32 at the opposed position.

As shown in FIG. 2, the work holding portion 20 has a structure in which a plurality of die rings 22 for holding the work W are annularly arranged on one surface of a disk 21 supported by the support shaft 11. There is. The disk 21 is intermittently rotated by the drive unit 12, so that the work W is fed from the supply unit 23.
Is supplied to the die ring 22, and the molded bottle cans B are sequentially discharged from the discharging section 24. In FIG. 2, a plurality of die rings 22 provided on the entire circumference of the disc 21 is used.
Some of them are shown, and the rest of the die ring 22 is omitted.

As shown in FIG. 3, the die ring 22 is a dish-shaped die ring main body 22 into which the bottom of the work W is fitted.
A and a chuck 22B, which is a ring-shaped hollow elastic member that expands by air and clamps and holds the can body of the work W.

The tool holding unit 30 has various processing tools 32 arranged in an annular shape on one side of the disc 31 supported by the support shaft 11 so that the disc 31 can be moved back and forth in the axial direction by the drive unit 12. It is configured. In the tool holding portion 30, a number of drawing dies for reducing the diameter of the opening of the bottomed tubular body W to form a tapered portion and a mouthpiece portion (neck-in processing), and forming a screw shape in the mouthpiece portion. A processing tool 32 for performing processing according to each processing step, such as a screw forming tool and a curl processing tool for forming a curl portion at the opening end, is provided, and these processing tools 32 are discs in the order of steps. It is arranged on 31. Each processing tool 32 can perform processing on each bottomed cylindrical body W held by the work holding unit 20 when the tool holding unit 30 moves forward to the left in FIG. 1.

Regarding the rotational position of the work holding part 20 (disc 21) with the support shaft 11 as the center of rotation, the central axis of each bottomed tubular body W with its opening facing the tool holding part 30 is the respective processing tool. It is set so as to coincide with the central axis of 32. Then, by the intermittent rotation of the disk 21 by the drive unit 12, each bottomed tubular body W is rotated to a position facing each processing tool 32 for the next process, and the next stage of processing is performed. become.

That is, when the tool holding unit 30 moves forward and the work holding unit 20 and the tool holding unit 30 come close to each other, each working tool 32 carries out working according to each process on the work W, When the holders 20 and 30 are separated from each other, the work holder 20 is rotated so that the machining tool 32 of the next process faces each work W. In this way, by repeating the operations of the holding parts 20 and 30 approaching each other, rotating and moving away from each other, the bottomed cylindrical body W is sequentially formed with a taper part, a mouth part, a screw shape, and the like. As a result, the shape of the bottle can B is given.

FIG. 3 shows a screw forming tool 40 which is one of the processing tools 32. The screw forming tool 40 has a first housing 41 attached to the disc 31 and a second housing 42 attached to the first housing 41 so as to be movable back and forth, and is entirely rotated by a drive device (not shown). It is driven to rotate about the axis O.

The second housing 42 is biased and held by the biasing member (not shown) toward the front end side (the left side in the figure) with respect to the first housing 41. It is provided with a core 43A that is in contact with and an outer core 43B that is in contact with the outer peripheral surface. The core 43A and the core 43B have a concavo-convex shape for forming a screw shape on the outer peripheral surface of the substantially columnar tip portion, and are rotatable about their respective axes, and the second housing 42 relative to the first housing 41. Cam roller C that moves in the radial direction according to the position of
By being moved in the radial direction by 1 and C2, the mouthpiece portion of the work W can be sandwiched and deformed between the concavo-convex shapes.

A pressing ring 47 is attached to the third housing 44 fixed to the tip side of the second housing 42 so as to be rotatable around the axis O. An elastic member 46, which is biased toward the tip side via a spring 45, is attached to the pressing ring 47. The elastic member 46 has a conical surface 46 a along the tapered portion formed on the work W and a cylindrical surface 46 along the can body portion.
b, the tool holding part 30 (screw forming tool 40) is pressed against the work W when the tool holding part 30 (screw forming tool 40) advances.

Reference numeral 25 is a stopper member fixed to the work holding portion 20 side, and when the pressing ring 47 is brought into contact with the stopper member 25, the pressing ring 4 is pressed.
Third housing 44 and second housing 4 to which 7 is fixed
2 and a core 43A and an outer core 43B provided inside thereof
The most advanced position in the axial direction with respect to the work holding portion 20 (die ring 22) is determined.

Next, the manufacturing of the bottle can B by the manufacturing apparatus 10 having the above-mentioned structure will be described. First,
When the work W is supplied to the die ring 22 by the supply unit 23, the work W is sequentially moved to each position facing the processing tool 32 provided in the tool holding unit 30 for each process by the intermittent rotation of the disk 21. To do.

By repeating the intermittent rotation of the disk 21 and the advance / retreat of the tool holding portion 30, the work W is processed in each step at each rotation position. That is, the diameter of the opening of the bottomed cylindrical work W is gradually reduced by neck-in processing to form the tapered portion and the mouthpiece. By this neck-in processing, the work W is pulled out to the tool holding section 30 side by the processing tool 32 and is in a state of being lifted from the die ring 22 as shown in FIG.

The workpiece W, which has been subjected to various kinds of processing to form the tapered portion and the die portion, is subjected to screw forming processing at the position A shown in FIG. In the screw forming process, first, as shown in FIG. 3, the cylindrical surface 46b is fitted into the can body portion from the taper portion of the work W by the forward movement of the work holding portion 20. When the work holding portion 20 further advances, the conical surface 46a of the elastic member 46 moves the work W as shown in FIG.
3 is pressed against the taper portion of the work W, and the work W is pushed into the die ring 22 by the urging force of the spring 45.
To a predetermined axial position with respect to.

As the work holding section 20 further advances, the work W is further pressed against the die ring 22 while the spring 45 is compressed and contracted as shown in FIG. 5, and the pressing ring 47 contacts the stopper member 25. Due to the contact between the stopper member 25 and the pressing ring 47, the advancement of the second housing 42 and the third housing 44 is stopped, and the work holding portion 20 is further advanced to bring about the first movement.
The axial distance between the housing 41 and the second housing 42 is narrowed.

By moving the first housing 41 forward to a predetermined position, as shown in FIG.
The first housing 41 moves forward with respect to the cam roller C.
1 and C2 move along the slopes 41a and 41b of the first housing 41, respectively, and the core 43A and the core 43B.
To move. As a result, the core 43A and the outer core 43B, which have been advanced to the inner and outer circumferences of the mouthpiece shape of the work W, are pressed against each other, and the entire screw forming tool 40 is rotated around the rotation axis O to form the screw Processing is performed.

During the screw forming process, the work W is at a predetermined axial position with respect to the work holding portion 20 as described above, and the core 43A and the outer core 43 which form the screw shape are formed.
B is also at a predetermined axial position with respect to the work holding portion 20 by the stopper member 25. That is, the work W and the core 43A and the outer core 43B always have a constant positional relationship, and the screw thread of the mouthpiece of the work W is always formed at a constant height.

After the above-described screw forming process, the work W is further subjected to trimming process, curling process, etc., so that the bottle can B manufactured by molding the work W is manufactured.
Is discharged from the manufacturing apparatus 10 by the discharge unit 24.

The manufacturing apparatus 10 and the manufacturing method for pushing the work W into the die ring 22 using the screw forming tool 40 to bring it into a predetermined position have been described above. The pressing tool 50 as shown in FIG. As one of the above, a manufacturing apparatus may be used in which the pressing step is incorporated in the tool holding section 30 and is one step.

In this pressing tool 50, a pin 51 attached to the disc 31 and a feeder 52 attached to the pin 51 so as to be movable in the axial direction are provided with an elastic body (for example, a spring) 53. It is a connected structure. The feeder 52 has a columnar portion 52a fitted to the inner peripheral surface of the opening of the work W and a flange 52b abutting on the opening end surface of the work W. The columnar portion 52a prevents the opening of the work W pressed by the flange 52b from being deformed. The repulsive force of the elastic body 53 is set such that the load applied to the work W by the pressing tool 50 does not cause the work W to buckle. The work W can be pushed into the die ring 22 by advancing the pressing tool 50 by the advancing disk 31 and bringing the feeder 52 into contact with the work W via the pin 51 and the elastic body 53.

[0035]

As described above, according to the method of manufacturing a metal bottle can according to the invention of claim 1, the bottomed tubular body is pressed against the die ring immediately before the screw forming process, so that the bottomed bottomed body is pressed. The screw forming process can be performed with the tubular body held in a predetermined position. Therefore, the height of the thread formed on the bottle can becomes constant, and it becomes possible to manufacture a metal bottle can in which winding failure is unlikely to occur.

According to the apparatus for manufacturing a metal bottle can according to the invention of claim 2, the bottomed tubular body is pressed against the die ring during the screw forming process by the screw forming tool. Can be a predetermined position. Therefore, the holding position of the bottomed tubular body is stable, the screw shape can be stably formed at a predetermined position of the mouthpiece portion, and it is possible to manufacture a metal bottle can that is less likely to cause winding failure.

According to the apparatus for manufacturing a metal bottle can according to the third aspect of the invention, since the pressing tool presses the bottomed tubular body against the die ring before the screw forming process by the screw forming tool, It is possible to hold the bottomed tubular body at a predetermined position during the forming process and form a screw shape at the predetermined position of the bottomed tubular body. Therefore, it is possible to manufacture a metal bottle can in which a screw shape is formed at a predetermined position and winding failure is less likely to occur.

[Brief description of drawings]

FIG. 1 is a schematic view showing an apparatus for manufacturing a metal bottle can according to an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II shown in FIG.

FIG. 3 is a cross-sectional view showing a main part of the manufacturing apparatus shown in FIG. 1 and showing a state in which a tip end of a screw forming tool approaches a bottomed cylindrical body in a screw forming process.

FIG. 4 is a cross-sectional view showing a main part of the manufacturing apparatus shown in FIG. 1 and showing a state in which an elastic member is in contact with a bottomed tubular body in a screw forming process.

5 is a cross-sectional view showing a main part of the manufacturing apparatus shown in FIG. 1 and showing a state in which an elastic member presses a bottomed tubular body against a die ring in a screw forming process.

FIG. 6 is a cross-sectional view showing a main part of the manufacturing apparatus shown in FIG. 1 and showing a state during screw forming processing.

FIG. 7 is a cross-sectional view showing a main part of an apparatus for manufacturing a metal bottle can according to another embodiment of the present invention.

[Explanation of symbols]

10 Metal Bottle Can Manufacturing Equipment 22 die ring 30 Tool holder 40 Screw Forming Tool 45 spring 46 Elastic member 50 pressing tools 53 Elastic body B bottle can W work (bottomed cylinder)

Claims (3)

[Claims] 1. A method for producing a metal bottle can by molding the bottomed tubular body while holding the bottom portion of the bottomed tubular body in a die ring, and immediately before the screw forming process. A method of manufacturing a metal bottle can, comprising a pressing step of pressing the bottomed tubular body against the die ring. 2. A die ring for holding a bottom portion of a bottomed tubular body, and a screw forming tool for forming a screw shape on a mouthpiece portion formed in an opening of the bottomed tubular body, wherein A manufacturing device of a metal bottle can for molding a bottom tubular body into a bottle can, wherein the screw forming tool faces the opening of the bottomed tubular body and is relatively movable in the axial direction. Is provided,
An apparatus for manufacturing a metal bottle can, comprising an elastic member that is pressed against the bottomed tubular body by its axial movement. 3. A die ring for holding a bottom portion of a bottomed tubular body, and a tool holding portion having a plurality of forming tools for shaping the bottomed tubular body into various shapes, the tool holding portion being provided. A device for molding a metal bottle can by sequentially processing the bottomed cylindrical body by each of the molding tools, wherein the molding tool is a base part formed on the bottomed cylindrical body. A metal bottle, comprising: a screw forming tool for forming a screw shape; and a pressing tool for pressing the bottomed tubular body against the die ring before forming the screw shape by the screw forming tool. Can manufacturing equipment.