JP6887363B2 - How to make cans - Google Patents

Description

The present invention relates to a method for producing a can.

Conventionally, there is known a bottle can manufacturing apparatus for manufacturing a bottle can by processing a work can (a can of an intermediate molded body) made of an aluminum alloy material or the like. The bottle can has a bottomed tubular shape, and has a can body (the body of the can) and a can bottom (the bottom of the can). A neck portion is formed by stepwise die processing (necking processing) at the open end of the can body and its vicinity. The neck portion has a tapered shape that gradually reduces in diameter from the outermost diameter portion of the can body toward the opening end side in the can axis direction. The bottle cans manufactured by the bottle can manufacturing apparatus are filled with contents such as beverages in a subsequent process, and a cap is screwed to the open end of the can body to seal the cans.

By the way, in recent years, _{from the viewpoint of environmental protection such as reduction of CO 2} emissions, there is an increasing demand for weight reduction of aluminum cans by reducing the raw materials used. Specifically, with the aim of reducing the weight of cans of 0.1 g or more (about 1% or more), it is necessary to develop lightweight cans that do not impair pressure resistance and productivity and are resistant to distribution pinholes. .. Even if the reduction is 0.1 g per can, if it can be applied to 18 billion cans per year in the aluminum can market, a large reduction in environmental load can be achieved.

In order to reduce the weight of cans, it is necessary to reduce the base plate thickness of the plate material (plate-like material of the can before molding, hereinafter sometimes referred to as blank), but if a thin blank is used, the base plate thickness will be reduced. The pressure resistance of the maintained can bottom is reduced.
When the pressure resistance becomes low, the action (rise) of the internal pressure of the can containing the contents deforms the annular convex portion of the can bottom that protrudes from the opening end along the can axis direction toward the can bottom side. , So-called bottom growth occurs.

When bottom growth occurs, the height of the can (total length in the can axis direction) is not stable, which causes problems in manufacturing and shipping, which is not preferable. Further, when the internal pressure of the can exceeds the pressure resistance strength, a so-called buckling occurs in which the dome portion of the can bottom, which is recessed from the can bottom along the can axis direction toward the opening end side, is inverted.

As a method for suppressing such bottom growth and buckling, for example, in Patent Documents 1 to 5 below, a concave portion is formed on the inner peripheral wall (inner wall) or the outer peripheral wall (outer wall) of the annular convex portion of the can bottom. It describes the bottom reform process that enhances the strength of the can bottom.

U.S. Pat. No. 5,704,241 Japanese Unexamined Patent Publication No. 2016-47541 Japanese Unexamined Patent Publication No. 2016-47542 Japanese Unexamined Patent Publication No. 11-244972 Japanese Unexamined Patent Publication No. 2000-197937

However, when the bottom reform process is applied to the bottle can, the following problems occur.
That is, in a bottle can, the contents are sealed with a cap, but the height of the open end of the can body changes due to the bottom reform process, and the sealed state may become unstable. Further, not only in bottle cans, but also in DI cans other than bottle cans, for example, when the height of the opening end of the can body changes due to bottom reform processing, when a can lid or the like is attached to the opening end, the can There was a risk that the sealed state of the product would become unstable.

The present invention has been made in view of such circumstances, and it is possible to stably secure the height accuracy of the can in the can axial direction while performing bottom reform processing on the bottom of the can. It is an object of the present invention to provide a can manufacturing method capable of achieving both weight reduction of the can and stabilization of the sealed state.

The method for manufacturing a can according to one aspect of the present invention is to use the can bottom of a bottomed tubular can having a can body and a can bottom from the open end of the can body along the can axis direction. A bottom reforming step of pressing at least one of the inner peripheral wall and the outer peripheral wall of the annular convex portion protruding toward the bottom side to form the concave portion to perform bottom reforming, and a trimming step of trimming the open end. The trimming step is performed after the bottom reforming step.

In the present invention, the trimming step of trimming the open end of the can body is performed after the bottom reforming step of performing the bottom reforming on the annular convex portion of the bottom of the can. That is, in the bottom remodeling step, it is conceivable that the height of the can in the can axial direction (total height of the can) may change due to the bottom remodeling process on the bottom of the can. When the trimming process is performed after the reform process, the height accuracy of the open end of the can after the trimming process in the can axial direction is stably ensured. As a result, in the post-process of making the can, for example, when a can lid or the like is attached to the open end, the sealed state of the can is stabilized.

Therefore, according to the present invention, it is possible to stably secure the height accuracy of the can in the can axial direction while performing bottom reform processing on the bottom of the can, thereby reducing the weight of the can and stabilizing the sealed state. Can be compatible.

Further, in the method for manufacturing a can according to one aspect of the present invention, a cupping step of drawing a disk-shaped blank to form a cup-shaped body and a squeezing and ironing process of the cup-shaped body are performed to form a can body. A DI step of forming a can of an intermediate molded body having a can bottom and a can bottom, a trimming step of trimming the open end portion of the can body, and a stepwise portion of the can body including the open end portion. A tapered neck portion that is die-processed and gradually reduces in diameter from the bottom of the can along the can axis direction toward the opening end portion side, and a mouthpiece portion that is connected to the opening end portion side of the neck portion. A necking step of molding, a screw forming step of applying a screw forming process to the mouthpiece portion, a final trimming step of applying a final trimming process to the mouthpiece portion, and the opening end portion of the can bottom along the can axis direction. The bottom reforming step includes a bottom reforming step of pressing at least one of the inner peripheral wall and the outer peripheral wall of the annular convex portion protruding toward the bottom side of the can to form the concave portion and perform the bottom reforming process. , The feature is that it is performed before the final trimming step.

In the present invention, the bottom reforming step of performing the bottom reforming process on the annular convex portion of the can bottom is performed before the final trimming step of performing the final trimming process on the base portion (open end portion) of the can body. That is, in the bottom reform process, it is conceivable that the height of the can in the can axial direction may change due to the bottom reform processing being performed on the bottom of the can, but the bottom reform processing is the final trimming as in the present invention. If it is performed in a step prior to the processing, the height accuracy of the open end of the can after the final trimming processing in the can axial direction is stably ensured. This makes it possible to reliably and stably seal the can with a cap in the post-process after making the can (bottle can).

Therefore, according to the present invention, it is possible to stably secure the height accuracy of the can in the can axial direction while performing bottom reform processing on the bottom of the can, thereby reducing the weight of the can and stabilizing the sealed state. Can be compatible.

Further, in the can manufacturing method, it is preferable that the bottom reforming step is performed before the screw forming step.

In this case, since the bottom reforming process is performed before the thread forming process, the height accuracy in the can axial direction at the male threaded portion of the base portion of the can after the thread forming process is stably ensured. That is, the accuracy of the height in the can axial direction from the bottom of the can to the male screw portion of the base portion of the can after the screw forming process is ensured. Further, the accuracy of the length in the can axial direction (the height of the male threaded portion to which the cap is screwed) from the male threaded portion of the base portion of the can after the screw forming process to the open end portion is stably ensured. Therefore, the state in which the cap is attached to the base portion of the can is maintained in a good state.

Further, in the method for manufacturing a can, the bottom reforming step may be performed after the screw forming step.
Further, in the method for producing a can, the bottom reforming step may be performed after the necking step.
Further, in the can manufacturing method, the bottom reforming step may be performed at the same time as the necking step.

In this case, the bottom reform process is performed inside the can manufacturing apparatus (bottle can manufacturing apparatus). That is, it is possible to perform the bottom reforming process on the bottom of the can in the can manufacturing apparatus without separately installing the bottom reforming apparatus in the pre-process of the can manufacturing apparatus. Therefore, it is possible to suppress an increase in equipment cost and installation space while reducing the weight of the can and stabilizing the sealed state.

Further, when the bottom reforming step is performed at the same time as the necking step (these steps are performed at the same timing, that is, the bottom reforming step and the necking step are synchronized), the following effects can be further obtained.

That is, in this case, when the bottom of the can is subjected to bottom reform processing, the can body of the can is die-processed by a die processing tool facing the chuck of the holding table holding the can from the processing table side. Will be done. As a result, the can is sandwiched between the die processing tool and the chuck, and the posture of the can held by the chuck is stable (particularly, the movement of the can in the direction of the central axis (can axis) of the chuck is restricted. ), Lifting of the can from the chuck due to bottom reform processing is surely prevented. Therefore, the accuracy of bottom reform processing can be stably improved.

Moreover, in this case, it is not necessary to prepare a pressing member or the like for pressing the open end of the can body, which has been conventionally required when performing the bottom reform processing, and the structure of the apparatus is simplified. Further, since the bottom reform processing and the die processing are performed at the same time, the bottom reform processing can be performed on the can while maintaining the can manufacturing time as before (that is, without increasing the processing time). ..

According to the can manufacturing method of the present invention, it is possible to stably secure the height accuracy of the can in the can axial direction while performing bottom reform processing on the bottom of the can, thereby reducing the weight of the can and sealing it. It is possible to achieve both stabilization and stabilization.

It is a flowchart which shows the manufacturing method of the bottle can which concerns on 1st Embodiment of this invention. It is a schematic diagram explaining the change of the shape of a can for each manufacturing process of a bottle can. It is a vertical cross-sectional view which shows the main part of the bottom of a bottle can. It is a side view which shows the schematic structure of the bottle can manufacturing apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the AA cross section of the bottle can manufacturing apparatus of FIG. It is a side view which shows the bottom reform mechanism provided in the bottle can manufacturing apparatus. It is a top view which shows the vicinity of the 1st moving means of a bottom reform mechanism. It is a front view which shows the vicinity of the 1st moving means of a bottom reform mechanism. It is a figure explaining the operation of the bottom reform mechanism. 9 is an enlarged view showing the vicinity of the chuck, the bottom of the can, and the pressing portion of FIG. It is a figure explaining the operation of the bottom reform mechanism. FIG. 11 is an enlarged view showing the vicinity of the chuck, the bottom of the can, and the pressing portion of FIG. It is a timing chart explaining the operation of the bottom reform mechanism. It is a side view which shows the can discharge mechanism of a bottle can manufacturing apparatus. It is a top view which shows the can discharge mechanism. It is a timing chart explaining the operation of the can discharge mechanism. It is a flowchart which shows the manufacturing method of the bottle can which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the manufacturing method of the bottle can which concerns on 3rd Embodiment of this invention. It is a vertical sectional view which shows the bottom reform mechanism and a can (DI can) of the bottom reform apparatus provided in the pre-process of a bottle can manufacturing apparatus, (a) the top support member of the bottom reform mechanism supports the open end part of a can. It represents a state before the operation, (b) a state in which the top support member supports the open end of the can. It is a modification of the bottom reform mechanism of FIG. 19, and shows (a) a state before the top support member supports the open end of the can, and (b) a state where the top support member supports the open end of the can. There is.

<First Embodiment>
Hereinafter, the method for producing a bottle can (can) B and the bottle can manufacturing apparatus (can manufacturing apparatus) 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 16. It should be noted that the drawings used for explaining the embodiments of the present invention may be shown by enlarging or excerpting the main parts in order to make the features of the present invention easy to understand. The dimensional ratio is not always the same as the actual one.

First, a method for manufacturing the bottle can B will be described.
As shown in FIGS. 1 and 2, the bottle can B has a plate material punching process S01, a cutting process (squeezing process) S02, a DI process (squeezing ironing process) S03, a trimming process S04, and a printing / painting (can outer surface) process. S05, painting (can inner surface) process S06, necking process S07, trimming process S08, bottom reform process S09, screw forming process S10, final necking process S11, final trimming process (trimming process) S12, curl process S13 and throttle process S14. After that, it is made into a can.

In the plate material punching step S01, for example, a rolled material (plate material) made of an aluminum alloy material or the like is punched to form a disk-shaped blank W0 as shown in FIG. 2A.
In the cupping step (cupping step) S02, the blank W0 is drawn (cupping) by a cupping press to form a cup-shaped body W1 as shown in FIG. 2 (b).

In the DI process (squeezing and ironing process) S03, the cup-shaped body W1 is squeezed and ironed (re-squeezed and ironed) by a DI processing device, and as shown in FIG. ) 51 and a bottomed tubular can (intermediate molded can) W2 having a can bottom (bottom of the can) 52 are molded. DI is an abbreviation for "Drawing & Ironing". Specifically, the can W2 includes a can body 51 which is a cylindrical peripheral wall and a can bottom 52 which is a bottom wall having a substantially disk shape. The central axis of the can body 51 of the can W2 and the central axis of the can bottom 52 are arranged coaxially with each other, and in the present embodiment, these common axes are referred to as can axes.

Further, in the DI step, the can bottom 52 is connected to a dome portion 55 recessed from the can bottom 52 along the can axis direction toward the opening end portion 51a side and an outer peripheral edge portion of the dome portion 55, and follows the can axis direction. An annular convex portion (rim) 56 that protrudes from the opening end portion 51a toward the can bottom 52 side and extends around the can axis is formed (see FIG. 3). The annular convex portion 56 includes a nose portion (grounding portion) 59 that protrudes most in the can axis direction from the can bottom 52, an inner peripheral wall (inner wall) 57 located inside the nose portion 59 in the can radial direction, and a nose portion 59. The outer wall (outer wall) 58 located on the outer side in the can radial direction is provided. The straight line shown by the alternate long and short dash line in FIG. 3 represents the can axis.
In the following description, intermediate molded cans W2 to W5 having a can body 51 and a can bottom 52 will be introduced. In this embodiment, it may be simply referred to as can W.

In FIGS. 1 and 2, the can W2 that has undergone the DI step S03 has ears formed at the open end portion 51a of the can body 51 and has a non-uniform height. Therefore, in the trimming step S04, a trimming device is used. The opening end portion 51a is trimmed to form a can (DI can) W3 in which the height of the opening end portion 51a of the can body 51 is evenly aligned over the entire circumference as shown in FIG. 2D. ..

Next, after washing the can W3 to remove oil and the like, surface treatment is performed to dry the can W3, and the outer surface of the can W3 is printed and painted (printing / painting (can outer surface) step S05), and the inner surface of the can W3 is printed and painted. By performing painting (painting (inner surface of can) step S06), a can (DI can) W4 as shown in FIG. 2 (e) is obtained.

The can W4 is transferred to the bottle can manufacturing apparatus 1. All of steps S07 to S14 described below are manufacturing steps in the bottle can manufacturing apparatus 1.

In the bottle can manufacturing apparatus 1, a plurality of types of die processing tools (necking molding dies) are used to stepwise die-process the region (open end 51a and its vicinity) including the opening end 51a of the can body 51. By performing (necking process), the base portion 53 and the neck portion 54 are formed (necking step S07). The neck portion 54 is formed into a tapered shape that gradually reduces in diameter from the outermost diameter portion of the can body 51 toward the opening end portion 51a side from the can bottom 52 along the can axis direction. The mouthpiece 53 is arranged at the open end 51a of the can body 51 and is connected to the neck 54, and is formed into a tubular shape having the smallest diameter in the can body 51. That is, the base portion 53 is arranged so as to be connected to the neck portion 54 from the can bottom 52 along the can axis direction to the opening end portion 51a side.
Further, if necessary, the trimming process of the opening end portion 51a having irregular heights is performed between the plurality of types of die processes by using the trimming processing tool of the rotation processing tool (trimming step S08).
As a result, as shown in FIG. 2 (f), a can (bottle can) W5 having a base portion 53 and a neck portion 54 on the can body 51 is formed.

Then, bottom reform processing is performed on at least one of the inner peripheral wall 57 and the outer peripheral wall 58 of the annular convex portion 56 of the can bottom 52 (bottom reform step S09). In the example of this embodiment, as shown in FIGS. 3, 10 and 12, the inner peripheral wall 57 of the annular convex portion 56 is subjected to bottom reform processing.

In the example of this embodiment, the bottom reform step S09 is performed at the same time as the necking step S07. Specifically, the bottom remodeling process in the bottom remodeling step S09 is performed at the same timing as a predetermined die process (for example, the last die process in step S07) among the plurality of die processes in the necking step S07. That is, at the same time as performing a predetermined die processing on the vicinity of the open end portion 51a of the can body 51 of the can W, a bottom reform processing is performed on the can bottom 52 of the can W.

Next, the base portion 53 of the can body 51 is subjected to screw forming by using the thread forming tool of the rotation processing tool (screw forming step S10).
Further, the base portion 53 is subjected to a final necking process using a plurality of types of die processing tools (final necking step S11), and a final trimming process is performed using a trimming processing tool of a rotation processing tool (final trimming process S12). That is, in the final trimming step S12 of the plurality of trimming steps S04, S08, and S12, the open end portion 51a of the can body 51 is trimmed.

Next, the base portion 53 (opening end portion 51a) of the can body 51 is curled using the curl processing tool of the rotation processing tool (curl step S13), and the throttle processing tool of the rotation processing tool (curl crushing processing tool). Throttle processing (throttle step S14) is performed using the above.
As a result, the bottle can B as shown in FIG. 2 (g) is produced. The bottle can B is filled with contents such as beverages in a step after the throttle step S14, and a cap is screwed to the base portion 53.

As described above, in the present embodiment, the bottom reform step S09 is performed before the final trimming step S12. That is, the (final) trimming step S12 is performed after the bottom reform step S09. Further, the bottom reform step S09 is performed before the screw forming step S10.

Next, the bottle can manufacturing apparatus 1 used for manufacturing the bottle can B will be described.
In FIGS. 4 and 5, the bottle can manufacturing apparatus 1 of the present embodiment has various molding processes including die processing and rotation processing on a bottomed tubular can (can of an intermediate molded body) W which is a work. This is a so-called bottle necker that manufactures a bottle can B having an desired shape by applying the above.

The bottle can manufacturing apparatus 1 penetrates the apparatus main body 4, the holding table 3 supported by the apparatus main body 4 and provided with a plurality of tubular chucks 7 capable of holding the can W, and the holding table 3 in the table axis TA direction. Processing that is supported by the apparatus main body 4 via the shaft portion 5 and is provided on the holding table 3 so as to face the table axis TA direction and is provided with a plurality of processing tools 6 for processing the can body 51 of the can W. It has a table 2. In the processing table 2 and the holding table 3, their respective central axes (table axes TA) extend in the horizontal direction, and these central axes are arranged coaxially with each other.

Further, the bottle can manufacturing apparatus 1 has a crank mechanism (reciprocating movement mechanism) 8 that reciprocates the processing table 2 in the table axis TA direction with respect to the holding table 3, and a holding table 3 around the table axis TA with respect to the processing table 2. It is provided with a table index mechanism 9 that intermittently rotates and moves. That is, the processing table 2 reciprocates in the table axis TA direction. The processing table 2 reciprocates in the table axis TA direction with respect to the holding table 3 and the apparatus main body 4. Further, the holding table 3 intermittently rotates around the table axis TA. The holding table 3 intermittently rotates around the table axis TA with respect to the processing table 2 and the apparatus main body 4.

Further, the bottle can manufacturing apparatus 1 includes a supply wheel 10 for supplying the can W to the holding table 3, a discharge wheel 11 for discharging the processed can (can-made bottle can) B from the holding table 3, and a holding table 3. It is provided with a wheel index mechanism 12 that intermittently rotates the supply wheel 10 and the discharge wheel 11 around the wheel shafts SA and DA in synchronization with the intermittent rotation around the table shaft TA. That is, the supply wheel 10 intermittently rotates around the wheel shaft SA in synchronization with the intermittent rotation around the table shaft TA of the holding table 3. The discharge wheel 11 rotates intermittently around the wheel shaft DA in synchronization with the intermittent rotation around the table shaft TA of the holding table 3.

Further, the bottle can manufacturing device 1 includes a drive motor (not shown) for driving the crank mechanism 8, the table index mechanism 9, and the wheel index mechanism 12, and the can bottom of the can W provided on the device main body 4 and held by the chuck 7. The bottom reform mechanism 13 is arranged on the 52 from the side opposite to the machining table 2 along the table axis TA direction, and the bottom reform mechanism 13 of the apparatus main body 4 is located at a different position around the table axis TA (specifically, , A position separated from the bottom reform mechanism 13 in the holding table rotation direction R1) and faced with the can bottom 52 of the can W held by the chuck 7 from the side opposite to the processing table 2 along the table axial direction TA. It is provided with a can discharge mechanism 14 to be arranged.

Further, the bottle can manufacturing apparatus 1 is provided in the apparatus main body 4, and is provided with a crank angle detecting means (not shown) capable of detecting a crank angle, which will be described later, and a bottom reform mechanism 13 based on a crank angle detected by the crank angle detecting means. It also includes a control unit (not shown) for operating the can discharge mechanism 14.

The definition of the direction (direction) used in this embodiment is as follows.
The direction along the table axis TA (the direction in which the table axis TA extends) is called the table axis TA direction.
Further, the direction orthogonal to the table axis TA is called the table radial direction. Of the table radial directions, the direction away from the table axis TA is referred to as the outside in the table radial direction, and the direction approaching the table axis TA is referred to as the inside in the table radial direction.
Further, the direction of orbiting around the table axis TA is referred to as the table circumferential direction. Of the table circumferential directions, the direction in which the holding table 3 is intermittently rotated with respect to the processing table 2 is called the holding table rotation direction R1, and the rotation direction opposite to this is called the side opposite to the holding table rotation direction R1. ..

The holding table rotation direction R1 is the same direction as the direction in which the plurality of processing tools 6 described later in the processing table 2 are arranged in the table circumferential direction in the order of processing into the can W. Therefore, the holding table rotation direction R1 can be said to be the downstream side of the processing order to the can W (machining order direction), and the side opposite to the holding table rotation direction R1 is called the upstream side of the processing order to the can W. be able to.

Further, the direction along the central axis O of the chuck 7 (the direction in which the central axis O of the chuck 7 extends), which will be described later, is referred to as the central axis O direction. In the example of this embodiment, the table shaft TA and the central shaft O of the chuck 7 are parallel to each other. Further, the can shaft of the can W held by the chuck 7 substantially coincides with the central axis O of the chuck 7. That is, the central axis O of the chuck 7 and the can axis of the can W held by the chuck 7 are coaxial with each other.
Further, the direction orthogonal to the central axis O of the chuck 7 is referred to as the chuck radial direction. Of the chuck radial directions, the direction away from the central axis O is referred to as the outer side in the chuck radial direction, and the direction approaching the central axis O is referred to as the inner side in the chuck radial direction. The chuck radial direction is the same as the can radial direction, which is the direction orthogonal to the can axis of the can W held by the chuck 7.
Further, the direction in which the chuck 7 orbits around the central axis O is referred to as the chuck circumferential direction. The chuck circumferential direction is the same as the can circumferential direction, which is the direction in which the can W held by the chuck 7 orbits around the can axis.

In FIGS. 4 and 5, the holding table 3 and the processing table 2 repeatedly move closer to each other and move away from each other in the table axis TA direction by the crank mechanism 8, and intermittently move in the table circumferential direction by the table index mechanism 9. It can be rotated relative to each other. Specifically, the machining table 2 moves closer to and further away from the holding table 3 in the table axis TA direction, and during one stroke (reciprocating movement) of the approaching separation, the machining table 2 moves closer to and further from the machining table 2. 3 rotates (intermittently rotates) by a predetermined amount in the circumferential direction of the table.

Then, for each stroke in which the processing table 2 and the holding table 3 are brought close to each other and separated from each other, the can body 51 of the can W held by the chuck 7 of the holding table 3 is processed by the processing tool 6 provided on the processing table 2. Is applied, and the holding table 3 moves the can W to the machining position by the next (another) machining tool 6 toward the downstream side (holding table rotation direction R1) of the machining order.
By repeating this operation, the can W held by the holding table 3 is sequentially machined by a plurality of machining tools 6 provided on the machining table 2, and when a series of machining is completed, the can W is sequentially machined. Bottle cans B having the desired shape are being manufactured.

The holding table 3 is generally called a turntable or an index table. The holding table 3 has a disk shape or a circular ring shape. A plurality of chucks 7 are arranged along the circumferential direction of the table on the outer peripheral portion of the surface of the holding table 3 facing the processing table 2. A can W is held by each of these chucks 7, and the opened end portion 51a of the held can W opens toward the processing table 2. That is, the holding table 3 holds a plurality of cans W.

In FIG. 10, the chuck 7 has a peripheral wall and a bottom wall. The can body 51 of the can W is fitted in the peripheral wall of the chuck 7. A telescopic ring 17 is provided on the peripheral wall of the chuck 7 to elastically deform by air pressure and hold the can body 51 of the can W in a detachable manner. A part of the outer peripheral wall 58 and the nose portion 59 of the can bottom 52 of the can W are brought into contact with the bottom wall of the chuck 7. Of the bottom wall of the chuck 7, the portion corresponding to the dome portion 55 of the can bottom 52 penetrates the bottom wall in the direction of the central axis O of the chuck 7, and the pressing portion 20 of the bottom reform mechanism 13 described later is inserted. An insertion hole 19 is formed.

In FIGS. 6 and 10, a through hole 18 penetrating in the table axis TA direction is formed in a portion of the holding table 3 corresponding to the chuck 7. The through hole 18 is arranged at a position overlapping the chuck 7 when viewed from the central axis O direction (table axis TA direction). In the example of this embodiment, the through hole 18 has a circular hole shape and is arranged coaxially with the central axis O of the chuck 7. The bottom reform mechanism 13 is inserted through the through hole 18. In the example of this embodiment, the pressing portion 20 of the bottom reform mechanism 13 and the tubular body 29 are inserted into the through hole 18.

In FIGS. 4 and 5, the processing table 2 is generally called a die table. The processing table 2 has a disk shape or a circular ring shape. A plurality of processing tools 6 for processing the can W held by the holding table 3 are arranged on the processing table 2 along the circumferential direction of the table. These machining tools 6 are arranged along the circumferential direction of the table on the outer peripheral portion of the surface of the machining table 2 facing the holding table 3, and the plurality of chucks 7 of the holding table 3 and each of the chucks 7 held by the chucks 7. They are arranged to face the can W from the table axis TA direction.
Further, the machining tool shaft (central shaft) of the machining tool 6 of the machining table 2, the central shaft O of the chuck 7 facing the machining tool 6 on the holding table 3, and the can shaft of the can W held by the chuck 7 are , Arranged coaxially with each other. Then, the can W is processed by the processing tool 6 in a state where the can shaft of the can W and the processing tool shaft are substantially aligned with each other.

The processing table 2 is formed with a plurality of mounting holes penetrating in the TA direction of the table axis arranged in the circumferential direction of the table. The plurality of processing tools 6 are attached to these mounting holes in the order of processing into the can W.

The plurality of machining tools 6 include a die machining tool and a rotary machining tool. In the present embodiment, a plurality of die processing tools and a plurality of rotation processing tools are detachably arranged in the plurality of mounting holes of the processing table 2 in the order of processing into the can W. It should be noted that some of the plurality of mounting holes may be vacant spaces in which the machining tool 6 cannot be mounted. In addition, oiling tools are arranged in some of the plurality of mounting holes.

The die processing tool moves in the can axis direction (direction parallel to the table axis TA) with respect to the can W, and draws to reduce the diameter of the peripheral wall (can body 51) of the can W and expands the diameter of the peripheral wall. Die processing such as processing is performed. That is, the plurality of types of die processing tools include drawing (diameter reduction) processing tools and diameter expansion processing tools. One type of die processing is applied to the can W by one die processing tool.

The rotation processing tool moves around the can axis with respect to the can W, and the peripheral wall (can body 51) of the can W is trimmed, screwed, curled, and throttled (curl crushing) by the rotational operation around the can axis. ) Rotational processing such as processing is performed. That is, the plurality of types of rotation processing tools include trimming processing tools, screw forming processing tools, curling processing tools, throttle (curl crushing) processing tools, and the like. One type of rotation processing is applied to the can W by one rotation processing tool.

The shaft portion 5 is integrally provided on the processing table 2 and extends on the table shaft TA, penetrates the holding table 3 in the table shaft TA direction, and can move in the table shaft TA direction with respect to the holding table 3. Is. The shaft portion 5 is slidably supported by the apparatus main body 4 in the table shaft TA direction, and the end portion on the side opposite to the processing table 2 along the table shaft TA direction is a connecting rod (not shown) of the crank mechanism 8. It is connected.

Although not particularly shown, the crank mechanism 8 is connected to a drive shaft to which a rotational driving force from a drive motor is input, and is rotated around the central axis of the drive shaft as the drive shaft rotates. It has a crankshaft and a connecting rod that connects the crankshaft and the shaft portion 5. The crankshaft rotates around the central axis of the drive shaft at a constant angular velocity.
The crank mechanism 8 converts the rotational motion around the central axis of the drive shaft input from the drive motor to the drive shaft into a linear motion in the TA direction of the table shaft and outputs it to the shaft portion 5.

Further, the crank angle detecting means detects the crank angle which is the circumferential position of the crankshaft along the central axis of the drive shaft. The crank angle represents an angular position around the central axis while the crankshaft makes one rotation (360 ° rotation) about the central axis of the drive shaft. In the example of this embodiment, the crank angle detecting means is, for example, an angle position detecting sensor (rotation angle sensor) such as a rotary encoder or a resolver.

The table index mechanism 9 has a cam structure (not shown). The table index mechanism 9 rotates and stops the holding table 3 around the table axis TA (intermittent rotation) for each stroke of the reciprocating movement of the processing table 2 by the cam structure.

The crank angle will be described.
The entire crank angle (0 to 360 °) around the central axis of the drive shaft includes a range of the dwell angle (dwell period) and a range of the allocation angle (index period). The sum of the size of the central angle in the range of the stopping angle and the size of the central angle in the range of the allocation angle is 360 °.

The retention angle is an angle range in which the holding table 3 is not rotated around the table axis TA with respect to the machining table 2 by the table index mechanism 9 (the angle range of the crank angle at which the rotation of the holding table 3 is stopped). Is. The stopping angle includes the bottom dead center (crank angle 180 °) of the processing table 2. Within the range of the retention angle, the processing table 2 moves closer to the holding table 3 in the table axis TA direction, and various processing is performed on the work can W.

The allocation angle (index angle) is an angle range in which the holding table 3 is rotationally moved around the table axis TA with respect to the processing table 2 by the table index mechanism 9. The allocation angle includes the top dead center (crank angle 0 °) of the processing table 2. Within this allocation angle, the processing table 2 is sufficiently separated from the holding table 3 in the table axis TA direction, and the holding table rotation direction is reached until the can W faces the processing tool 6 for performing the next processing. Transferred to R1.
Specifically, in FIGS. 13 and 16, when the crank angle is the allocation angle, the holding table 3 rotates, and when the crank angle is the stopping angle, the holding table 3 stops.

In FIG. 5, the supply wheel 10 is called an in-feed wheel and has a substantially cylindrical shape. The supply wheel 10 receives the can W supplied to the shooter 15 from the outside (pre-process) of the bottle can manufacturing apparatus 1, and delivers the can W to the holding table 3.
The discharge wheel 11 is called a discharge wheel and has a substantially cylindrical shape. The discharge wheel 11 receives the can W (bottle can B) processed by the bottle can manufacturing apparatus 1 from the holding table 3 and delivers (discharges) it to the transport means 16. The transport means 16 transports the bottle can B toward the outside (post-process) of the bottle can manufacturing apparatus 1.

The supply wheel 10 is supported by the apparatus main body 4 by arranging its central axis (wheel axis) SA in parallel with the table axis TA. The supply wheel 10 is rotated in the wheel rotation direction R2 around the wheel axis SA.
The discharge wheel 11 is supported by the apparatus main body 4 by arranging its central axis (wheel axis) DA in parallel with the table axis TA. The discharge wheel 11 is rotated in the wheel rotation direction R3 around the wheel axis DA.
Although not particularly shown, a plurality of concave pockets capable of holding the can body 51 of the can W are formed on the outer peripheral surfaces of the supply wheel 10 and the discharge wheel 11 at intervals in the circumferential direction.

The wheel index mechanism 12 has a cam structure (not shown). Due to the cam structure, the wheel index mechanism 12 rotates and stops the supply wheel 10 around the wheel shaft SA (intermittent rotation) and rotates the discharge wheel 11 around the wheel shaft DA for each stroke of the reciprocating movement of the machining table 2. Rotate and stop rotation (intermittent rotation).

The supply wheel 10 and the discharge wheel 11 are rotated in the wheel rotation direction R2, which is synchronized with the intermittent rotation around the table axis TA of the holding table 3 and is rotated in the opposite direction to the rotation direction R1 of the holding table 3 by the wheel index mechanism 12. , R3 are rotated intermittently, respectively.
The supply wheel 10 and the discharge wheel 11 are mechanically connected by a gear or the like (not shown), and intermittently rotate around each wheel shaft SA and DA in synchronization with each other.

Specifically, in FIG. 5, when the supply wheel 10 rotates intermittently and the can W held in the pocket of the supply wheel 10 is arranged at a position corresponding to the chuck 7 of the holding table 3 (immediately above the chuck 7). In addition, the pushing portion provided in the processing table 2 pushes the can W toward the holding table 3, and the can W is handed over from the pocket to the chuck 7 and held by the chuck 7.
Further, the can W held by the chuck 7 of the holding table 3 is transferred to the holding table rotation direction R1 for each stroke of the processing table 2, and after all the processing is completed, the position corresponding to the pocket of the discharge wheel 11 ( When placed directly under the pocket), the can discharge mechanism 14, which will be described later, pushes the can W (bottle can B of all processed products) toward the discharge wheel 11 and the bottle can. B is handed over from the chuck 7 to the pocket and held in the pocket.
The bottle can B held in the pocket is transferred around the wheel shaft DA with the intermittent rotation of the discharge wheel 11, and after being released from the pocket, is transported by the transport means 16 and is transported by the transport means 16 to the bottle can manufacturing apparatus 1. Transferred to the outside.

Then, as shown in FIG. 6, the bottom reform mechanism 13 is arranged between the holding table 3 along the table axis TA direction and the device main body 4, and is supported by the device main body 4.
As shown in FIG. 5, when viewed from the table axis TA direction, the bottom reform mechanism 13 is located at a position corresponding to a chuck 7A facing a predetermined die processing tool among a plurality of processing tools 6 provided on the processing table 2. It is located in. That is, the bottom reform mechanism 13 is arranged at a position overlapping the chuck 7A facing the die processing tool when viewed from the table axis TA direction. Further, the central axis C2 described later of the bottom reform mechanism 13 and the central axis O of the chuck 7A substantially coincide with each other (these central axes C2 and O are arranged coaxially).

Specifically, the chuck 7A holds the chuck 7A more than the chuck 7B facing the trimming tool (final trimming tool) that performs the final trimming process on the can W among the plurality of processing tools 6 provided on the processing table 2. It is located on the side opposite to the table rotation direction R1 (that is, the upstream side in the processing order to the can W). Further, among the plurality of processing tools 6 provided on the processing table 2, the chuck 7A is on the opposite side of the holding table rotation direction R1 than the chuck 7C facing the screw forming processing tool for performing the thread forming process on the can W. Is located in.
That is, when the bottle can manufacturing apparatus 1 is viewed from the table axis TA direction, the bottom reform mechanism 13 provided in the apparatus main body 4 is the final of the plurality of processing tools 6 arranged on the processing table 2 along the table circumferential direction. It is arranged on the side opposite to the holding table rotation direction R1 (upstream side in the processing order to the can W) than the trimming processing tool and the screw forming processing tool.

As shown in FIGS. 6 to 12, the bottom reform mechanism 13 has a pressing portion 20 capable of contacting the can bottom 52 of the can W held by the chuck 7, and the pressing portion 20 in the O direction of the central axis of the chuck 7. It is provided with a first moving means 21 for moving the pressing portion 20 in the chuck radial direction, a second moving means 22 for moving the pressing portion 20 in the chuck radial direction, and a third moving means 23 for moving the pressing portion 20 in the chuck circumferential direction.

Further, the bottom reform mechanism 13 transmits the rotational motion of the support frame 24 fixed to the apparatus main body 4, the elevating motor 25 provided on the support frame 24, and the elevating motor 25 around the motor axis to the central axis O of the chuck 7. The elevating cam 26 that converts into a reciprocating linear motion in the direction (table axis TA direction), the main body frame 27 connected to the elevating cam 26, and the main body frame 27 with respect to the support frame 24, the central axis O of the chuck 7. It is provided with an elevating guide 28 that is connected so as to be slidable in a direction.

Further, the bottom reform mechanism 13 includes a tubular body 29 arranged coaxially with the central axis O of the chuck 7 in the main body frame 27, a pressing portion 20 protruding from the open end of the tubular body 29 toward the chuck 7, and a tubular body. A rotary elevating shaft 30 provided inside the cylinder 29 that rotates around the central axis O (chuck circumferential direction) and moves in the central axis O direction, and a rotary elevating shaft provided inside the cylinder 29. The rotary motion of the 30 is transmitted to the pressing portion 20, and the reciprocating linear motion of the rotary elevating shaft 30 in the central axis O direction is moved in the radial direction (chuck radial direction) orthogonal to the central axis O of the pressing portion 20. The link portion 31 to be converted, the rotary ball spline 32 that connects the rotary elevating shaft 30 to the main body frame 27 so as to be rotatable around the central axis O and slidably movable in the direction of the central axis O, and the main body frame 27 are provided. , Rotating motor 33 for rotating the rotary elevating shaft 30 around the central axis O via the timing belt 34, the pressing motor 35 provided on the main body frame 27, and the rotational movement of the pressing motor 35 around the motor axis. It is provided with a pressing cam 36 that converts the chuck 7 into a reciprocating linear motion in the direction of the central axis O and transmits it to the rotary elevating shaft 30.
The central axes of the tubular body 29, the rotary elevating shaft 30, and the rotary ball spline 32 coincide with each other, and the common axes are indicated by reference numerals C2 in the drawing. The central axis C2 is coaxial with the central axis O of the chuck 7. Further, the elevating motor 25, the rotating motor 33, and the pressing motor 35 are, for example, a servo motor, a stepping motor, or the like.

The pressing portion 20 of the present embodiment is a forming roller. The pressing portion 20 is a molding die having a disk shape, a cylindrical shape, or a columnar shape, and its central axis C1 extends parallel to the central axis O of the chuck 7. The pressing portion 20 is attached to the tubular body 29 so as to be rotatable around the central axis C1 and slidable in the radial direction orthogonal to the central axis C1.

In FIGS. 9 and 10, the central axis C1 of the pressing portion 20 is arranged coaxially with the central axis O of the chuck 7. On the other hand, in FIGS. 11 and 12, the pressing portion 20 is moved in the chuck radial direction by the action of the rotary elevating shaft 30 and the link portion 31, and the central axis C1 of the pressing portion 20 is the chuck 7. It is separated from the central axis O. The pressing portion 20 can come into contact with the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 of the can W held by the chuck 7.

Specifically, a flange portion is formed on the outer peripheral edge portion of the pressing portion 20, and the length (thickness) of the flange portion in the central axis C1 direction is the can axis direction of the inner peripheral wall 57 of the annular convex portion 56. It is set smaller than the length of. Then, the flange portion of the pressing portion 20 abuts on the inner peripheral wall 57 of the annular convex portion 56, and the inner peripheral wall 57 is pressed outward in the chuck radial direction to form a recess 60 in the inner peripheral wall 57. (See FIG. 3). In the example of the present embodiment, the pressing portion 20 is rotationally moved around the central axis O of the chuck 7 by the third moving means 23, so that the inner peripheral wall 57 of the annular convex portion 56 is formed along the can circumferential direction. A ring-shaped recess 60 is formed.

The first moving means 21 causes the main body frame 27 having the tubular body 29 to which the pressing portion 20 is attached and the main body frame 27 to reciprocate (reciprocate linear motion) in the central axis O direction of the chuck 7 with respect to the support frame 24. It includes an elevating motor 25, an elevating cam 26, and an elevating guide 28.
By the first moving means 21, the pressing portion 20 passes through the through hole 18 of the holding table 3 and the insertion hole 19 of the chuck 7 in the direction of the central axis O with respect to the can bottom 52 of the can W held by the chuck 7. It can move close and away.

The second moving means 22 has a main body frame 27 having a tubular body 29 to which the pressing portion 20 is attached, and a radial direction (chuck radial direction) in which the pressing portion 20 is orthogonal to the central axis O of the chuck 7 with respect to the tubular body 29. A pressing motor 35, a pressing cam 36, a rotary elevating shaft 30, a rotary ball spline 32, and a link portion 31 are provided.
By the second moving means 22, the pressing portion 20 can move closer to and further from the bottom 52 of the can W held by the chuck 7 in the chuck radial direction.

The third moving means 23 rotates the pressing portion 20 around the central axis O of the chuck 7 (in the chuck circumferential direction) with respect to the main body frame 27 having the tubular body 29 to which the pressing portion 20 is attached and the tubular body 29. It includes a rotation motor 33, a timing belt 34, a rotary ball spline 32, a rotation elevating shaft 30, and a link portion 31.
By the third moving means 23, the pressing portion 20 can rotate and move in the circumferential direction of the chuck with respect to the can bottom 52 of the can W held by the chuck 7.

Then, the control unit determines the elevating motor 25 of the first moving means 21, the pressing motor 35 of the second moving means 22, and the rotating motor of the third moving means 23 based on the crank angle detected by the crank angle detecting means. 33 is operated.

Next, with reference to the timing chart shown in FIG. 13, the bottom reform processing of the can W into the can bottom 52 by the bottom reform mechanism 13 will be described.
In FIG. 13, when the crank angle is within the range of the stopping angle, the rotation operation of the holding table 3 in the table circumferential direction is stopped. In the state where the holding table 3 is stationary, first, the pressing portion 20 is moved closer to the can bottom 52 of the can W held by the chuck 7 in the central axis O direction by the first moving means 21.

Specifically, from the initial state of the bottom reform processing by the bottom reform mechanism 13 shown in FIG. 6, the elevating motor 25 is operated by the control unit and the motor shaft is rotated to rotate the elevating cam 26 and the elevating guide 28. The pressing portion 20 moves forward (rises) toward the chuck 7 side along the central axis O direction together with the main body frame 27.
As shown in FIGS. 9 and 10, when the pressing portion 20 reaches the rising end in the central axis O direction, the control unit stops the rotation of the motor shaft of the elevating motor 25, and the pressing portion 20 is the bottom of the can W. It is maintained in a state of being placed close to 52.

Next, in FIG. 13, the pressing portion 20 is moved closer to the can bottom 52 of the can W held by the chuck 7 in the chuck radial direction by the second moving means 22.
Specifically, as shown in FIGS. 9 and 10, the pressing motor 35 is operated by the control unit from a state in which the central axis C1 of the pressing unit 20 is arranged coaxially with the central axis O of the chuck 7. By the action of the pressing cam 36 having a cam roller eccentric with respect to the motor shaft by rotating the motor shaft, the rotary elevating shaft 30 reciprocating in the central axis O direction by the pressing cam 36, and the link portion 31. The pressing portion 20 moves outward in the chuck radial direction. As a result, the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 is pressed against the outer peripheral edge portion (flange portion) of the pressing portion 20, and the inner peripheral wall 57 is recessed 60 toward the outside in the can radial direction. Is molded (see FIG. 3).
As shown in FIGS. 11 and 12, when the pressing portion 20 reaches the outer end in the chuck radial direction, the control portion stops the rotation of the motor shaft of the pressing motor 35, and the pressing portion 20 is an annular protrusion of the can bottom 52. It is maintained in a state of being pressed by the portion 56.

Next, in FIG. 13, the pressing portion 20 is rotationally moved in the circumferential direction of the chuck with respect to the bottom 52 of the can W held by the chuck 7 by the third moving means 23.
Specifically, as shown in FIGS. 11 and 12, the rotary motor 33 is operated by the control unit while the pressing portion 20 is pressed against the inner peripheral wall 57 of the annular convex portion 56, and the motor shaft thereof is moved. A rotary ball spline 32 that rotates and is connected to the motor shaft via a pulley and a timing belt 34, a rotary lift shaft 30 whose rotation around the central axis O is restricted with respect to the rotary ball spline 32, and a rotary lift shaft. Due to the action of the link portion 31 whose rotation around the central axis O is restricted with respect to 30, the pressing portion 20 rotates and moves in the chuck circumferential direction. As a result, the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 is pressed against the outer peripheral edge portion (flange portion) of the pressing portion 20 that rolls on the inner peripheral wall 57, and the inner peripheral wall 57 is pressed in the can circumferential direction. A ring-shaped recess 60 extending over the entire circumference of the is formed. In this way, the bottom 52 of the can W is subjected to bottom reform processing.
After the pressing portion 20 rolls on the inner peripheral wall 57 of the annular convex portion 56 over the entire circumference in the can circumferential direction, the control unit stops the rotation of the motor shaft of the rotary motor 33 and moves in the chuck circumferential direction of the pressing portion 20. Rotational movement is stopped.

Next, in FIG. 13, in the reverse procedure of the above, the pressing portion 20 is directed inward in the chuck radial direction (center in the radial direction) from the annular convex portion 56 of the can bottom 52 of the can W by the second moving means 22. Move apart. Further, the pressing portion 20 moves backward (descends) from the can bottom 52 of the can W along the central axis O direction by the first moving means 21.
All the operations of the bottom reform mechanism 13 described above are performed while the holding table 3 is stationary.

As shown in FIG. 14, the can discharge mechanism 14 is arranged between the holding table 3 along the table axis TA direction and the device main body 4, and is supported by the device main body 4.
As shown in FIG. 5, the can discharge mechanism 14 is arranged at a position corresponding to the chuck 7 facing the pocket of the discharge wheel 11 when viewed from the table axis TA direction. That is, the can discharge mechanism 14 is arranged at a position overlapping the chuck 7 facing the pocket of the discharge wheel 11 when viewed from the table axis TA direction. Further, the central axis C3 described later of the can discharge mechanism 14 and the central axis O of the chuck 7 substantially coincide with each other (these central axes C3 and O are arranged coaxially).

As shown in FIGS. 14 and 15, the can discharge mechanism 14 has an extrusion portion 40 capable of contacting the can bottom 52 of the can W held by the chuck 7, and the extrusion portion 40 in the O direction of the central axis of the chuck 7. It is provided with a discharge means 43 and a discharge means 43 for moving to.
Further, the discharging means 43 has a first elevating portion 41 that moves the extruding portion 40 in the central axis O direction of the chuck 7, and an extruding portion 40 in the central axis O direction of the chuck 7 at a speed slower than that of the first elevating portion 41. It includes a second elevating part 42 to be moved. That is, the amount of movement per unit time (the speed at which the extruded portion 40 is moved in the central axis O direction) that the first elevating portion 41 moves the extruded portion 40 in the central axis O direction is determined by the second elevating portion 42. Is set to be larger than the amount of movement per unit time for moving in the direction of the central axis O. In other words, the amount of movement per unit time in which the first elevating part 41 moves the extruded part 40 in the central axis O direction is per unit time in which the second elevating part 42 moves the extruded part 40 in the central axis O direction. The amount of movement of is set small.

Further, the can discharge mechanism 14 includes a support frame 44 fixed to the apparatus main body 4, an elevating cylinder 45 provided on the support frame 44, a main body frame 47 connected to the piston rod 46 of the elevating cylinder 45, and a main body. The cylinder 48 arranged coaxially with the central axis O of the chuck 7 in the frame 47, the discharge cylinder 49 provided in the main body frame 47, and the piston rod 50 of the discharge cylinder 49 are placed in the cylinder 48 with the central axis O. It includes a ball spline 61 that slidably supports in a direction, and a joint 62 of a piston rod 50.
The central axes of the extruded portion 40, the tubular body 48, the ball spline 61, and the piston rod 50 coincide with each other, and the common axes are indicated by reference numerals C3 in the drawing. The central axis C3 is coaxial with the central axis O of the chuck 7. Further, the elevating cylinder 45 and the discharging cylinder 49 are, for example, an air cylinder or the like.

The extruded portion 40 of the present embodiment has a cylindrical shape or a columnar shape. In the illustrated example, the extrusion portion 40 is arranged on the chuck 7 side along the central axis O direction with respect to the tubular body 48. The extrusion portion 40 is attached to the tip of the piston rod 50 of the discharge cylinder 49. The tip surface of the extruded portion 40 facing the chuck 7 side in the O direction of the central axis has a convex curved surface shape corresponding to (engaging) the concave curved surface shape of the dome portion 55 of the can bottom 52 of the can W held by the chuck 7. ing. That is, in the cross-sectional view along the central axes O and C3 shown in FIG. 14 (cross-sectional view including the central axes O and C3), the radius of curvature formed by the concave curved surface portion of the dome portion 55 of the can W and the tip of the extruded portion 40. The radius of curvature formed by the convex curved surface portion of the surface is substantially the same as each other.

The first elevating portion 41 reciprocates (reciprocating linear motion) the main body frame 47 in the central axis O direction with respect to the main body frame 47 supporting the discharge cylinder 49 to which the extruding portion 40 is attached and the support frame 44. A cylinder 45 and a piston rod 46 are provided.
By the first elevating part 41, the pushing part 40 passes through the through hole 18 of the holding table 3 and the insertion hole 19 of the chuck 7 in the central axis O direction with respect to the can bottom 52 of the can W held by the chuck 7. It can move close and away.
Further, what is indicated by reference numeral S1 in FIG. 14 is a stroke in the direction of the central axis O of the extruded portion 40 by the first elevating portion 41. At the rising end where the extruded portion 40 is raised by the first elevating portion 41, the tip surface of the extruded portion 40 is arranged close to or abutted against the dome portion 55 of the can bottom 52 of the can W.

The second elevating part 42 includes a discharge cylinder 49 and a piston rod 50 that reciprocate the extruded part 40 in the central axis O direction with respect to the main body frame 47.
By the second elevating part 42, the pushing part 40 can push the can bottom 52 of the can W held by the chuck 7 toward the opening end portion 51a side in the central axis O direction, and the side opposite to the pushing direction. It is possible to retreat toward. When the pushing portion 40 pushes out the can bottom 52, the can W held by the chuck 7 is separated from the chuck 7 and delivered to the pocket of the discharge wheel 11.
Further, what is indicated by reference numeral S2 in FIG. 14 is a stroke in the direction of the central axis O of the extruded portion 40 by the second elevating portion 42. The stroke S2 of the second elevating unit 42 is set smaller than the stroke S1 of the first elevating unit 41.

Then, the control unit operates the elevating cylinder 45 of the first elevating unit 41 and the discharging cylinder 49 of the second elevating unit 42 based on the crank angle detected by the crank angle detecting means.

Next, the discharge operation of the can W (bottle can B) from the chuck 7 by the can discharge mechanism 14 will be described with reference to the timing chart shown in FIG.
In FIG. 16, when the crank angle is within the range of the stopping angle, the rotation operation of the holding table 3 in the table circumferential direction is stopped. In the state where the holding table 3 is stopped, first, the pushing portion 40 is moved closer to the bottom 52 of the can W held by the chuck 7 in the direction of the central axis O by the first elevating portion 41.

Specifically, from the initial state of the can discharge operation by the can discharge mechanism 14 shown in FIG. 14, the elevating cylinder 45 is operated by the control unit, and the piston rod 46 advances toward the chuck 7 side in the central axis O direction. It moves (ascends), and along with this, the extrusion portion 40 moves forward together with the main body frame 47 toward the chuck 7 side in the central axis O direction.
When the extruded portion 40 reaches the ascending end in the central axis O direction in response to the stroke S1 of the first elevating portion 41, the control unit maintains the piston rod 46 of the elevating cylinder 45 at the ascending end position.

Next, in FIG. 16, the extruded portion 40 is moved forward (raised) in the central axis O direction by the second elevating portion 42, and the can bottom 52 of the can W held by the chuck 7 is pushed out from the chuck 7. The can W is detached (can ejected).
Specifically, as shown by a two-dot chain line in FIG. 14, the discharge cylinder 49 is operated by the control unit from a state in which the extrusion unit 40 is placed close to or in contact with the can bottom 52 by the first elevating unit 41. The piston rod 50 moves forward (rises) toward the open end 51a side of the can W (that is, the processing table 2 side) along the central axis O direction, and the extruded portion 40 moves forward along with this toward the central axis O. It moves forward toward the opening end 51a side in the direction.
After the extruded portion 40 reaches the ascending end in the central axis O direction and the can W is discharged from the chuck 7 in accordance with the stroke S2 of the second elevating portion 42, the second elevating portion is performed in the reverse procedure of the above. By 42, the extruded portion 40 moves backward (descends) in the central axis O direction. Further, the extruded portion 40 moves backward in the central axis O direction by the first elevating portion 41.
All the operations of the can discharge mechanism 14 described above are performed while the holding table 3 is stationary.

In the method for manufacturing the bottle can B of the present embodiment described above, the bottom reform step S09 in which the annular convex portion 56 of the can bottom 52 is bottom-reformed is applied to the base portion 53 (open end portion 51a) of the can body 51. The final trimming process is performed before the final trimming step S12. That is, in the bottom reform step S09, it is conceivable that the height of the can W in the can axial direction may change due to the bottom reform processing of the can bottom 52, but as in the present embodiment, the bottom reform When the processing is performed in a step prior to the final trimming processing, the height accuracy of the opening end portion 51a of the can W after the final trimming processing in the can axial direction is stably ensured. This makes it possible to reliably and stably seal the bottle can B with the cap in the post-process after the bottle can B is manufactured.

Therefore, according to the present embodiment, it is possible to stably secure the height accuracy of the bottle can B in the can axial direction while performing the bottom reform processing on the can bottom 52, thereby reducing the weight of the can B and sealing it. It is possible to achieve both stabilization of the state.

Specifically, in the bottle can B manufactured by performing the bottom reform process, the strength of the can bottom 52 is increased and the pressure resistance is improved, so that the can bottom 52 (that is, the original plate thickness of the blank W0) is thinned. While reducing the weight of the can B, bottom growth and buckling can be reliably prevented.

Further, in the present embodiment, since the bottom reform step S09 is performed before the screw forming step S10, the following effects are obtained.
That is, in this case, since the bottom reforming process is performed before the thread forming process, the height accuracy in the can axial direction at the male threaded portion of the base portion 53 of the can W after the thread forming process is stably ensured. That is, the accuracy of the height in the can axial direction from the can bottom 52 to the male screw portion of the base portion 53 in the can W after the screw forming process is ensured. Further, the accuracy of the length in the can axial direction (the height of the male screw portion to which the cap is screwed) from the male screw portion of the base portion 53 of the can W after the screw forming process to the opening end portion 51a is stably ensured. .. Therefore, the state in which the cap is attached to the base portion 53 of the bottle can B is well maintained.

Further, in the present embodiment, bottom reform processing is performed inside the bottle can manufacturing apparatus 1. That is, it is possible to perform the bottom reform processing on the can bottom 52 of the can W in the bottle can manufacturing apparatus 1 without separately installing the bottom reform apparatus in the pre-process of the bottle can manufacturing apparatus 1. Therefore, it is possible to suppress an increase in equipment cost and installation space while reducing the weight of the bottle can B and stabilizing the sealed state.

Further, when the bottom reform step S09 is performed at the same time as the necking step S07 (these steps are performed at the same timing, that is, the bottom reform step S09 and the necking step S07 are synchronized) as in the present embodiment, the following is further performed. The action effect of is obtained.

That is, in this case, when the bottom 52 of the can W is subjected to bottom reform processing, the can body of the can W is used by a die processing tool facing the chuck 7A of the holding table 3 holding the can W from the processing table 2 side. Die processing is applied to 51. As a result, the can W is sandwiched between the die processing tool and the chuck 7A, and the posture of the can W held by the chuck 7A is stable (particularly, the can in the direction of the central axis O (can axis) of the chuck 7A). The movement of the can W is restricted), and the lifting of the can W from the chuck 7A due to the bottom reforming process is surely prevented. Therefore, the accuracy of bottom reform processing can be stably improved.

Moreover, in this case, it is not necessary to prepare a pressing member or the like for pressing the open end portion 51a of the can body 51, which has been conventionally required when performing the bottom reform processing, and the structure of the apparatus is simplified. Further, since the bottom reform processing and the die processing are performed at the same time, the bottom reform processing is performed on the can W while maintaining the can manufacturing time of the bottle can B as before (that is, without increasing the processing time). be able to.

Further, in the present embodiment, in the bottom reform step S09, the pressing portion 20 of the bottom reform mechanism 13 bottom reforms the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 of the can W held by the chuck 7. Apply processing. That is, since the pressing portion 20 moves from the inside (center side) in the chuck radial direction to the outside with respect to the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 to form the recess 60, the can of this can W. The bottom 52 and the can body 51 can be stably supported by the chuck 7 having a simple structure, and as a result, the bottom reform process can be easily performed on the can bottom 52 with high accuracy. Further, in this case, it is easy to maintain a good appearance of the can bottom 52 of the can W.

Further, in the present embodiment, the pressing portion 20 of the bottom reform mechanism 13 is a forming roller, and the pressing portion 20 that presses the can bottom 52 of the can W is rolled on the can bottom 52 (annular convex portion 56). ing. As a result, the frictional resistance when the recess 60 is formed in the can bottom 52 by the pressing portion 20 can be reduced to prevent scratches on the surface of the can bottom 52, and the region where the recess 60 is formed with respect to the can bottom 52 can be easily widened. Can be secured. Therefore, the strength of the can bottom 52 is more reliably and stably increased.

<Second Embodiment>
Next, a method for manufacturing the bottle can (can) B according to the second embodiment of the present invention will be described with reference to FIG.
The same components as those in the above-described embodiment will be omitted in detail, and only the differences will be described below.

As shown in FIG. 17, the manufacturing method of the bottle can B of the present embodiment includes a plate material punching process S01, a cutting process (squeezing process) S02, a DI process (squeezing ironing process) S03, a trimming process S04, and printing / painting ( Can outer surface) process S05, painting (can inner surface) process S06, necking process S17, trimming process S18, screw forming process S19, final necking process S20, bottom reform process S21, final trimming process (trimming process) S22, curl process S23 and The throttle process S24 is provided.

Also in the method for manufacturing the bottle can B of the present embodiment, the bottom reform step S21 is performed before the final trimming step S22. That is, the (final) trimming step S22 is performed after the bottom reform step S21. Further, in the present embodiment, unlike the above-described embodiment, the bottom reform step S21 is performed after the screw forming step S19.
That is, in the present embodiment, the bottle can manufacturing apparatus 1 is viewed from the table axis TA direction (see FIG. 5), and the bottom reform mechanism 13 provided in the apparatus main body 4 is arranged on the processing table 2 along the table circumferential direction. Of the plurality of machining tools 6, the screws are arranged on the side opposite to the holding table rotation direction R1 (upstream side in the machining order to the can W) from the final trimming tool (position facing the chuck 7B). It is arranged in the holding table rotation direction R1 (downstream side in the processing order to the can W) from the molding processing tool (position facing the chuck 7C).

Further, in the present embodiment, the bottom reform step S21 is performed after the necking step S17.
In this embodiment, the bottom reform step S21 may be performed at the same time as the final necking step S20. Specifically, the bottom remodeling process in the bottom remodeling step S21 may be performed at the same timing as a predetermined die process (for example, the last die process in step S20) among the plurality of die processes in the final necking step S20. ..

Also in the method for producing the bottle can B of the present embodiment described above, the same effects as those of the above-described embodiment can be obtained.

<Third Embodiment>
Next, a method for manufacturing the bottle can (can) B according to the third embodiment of the present invention will be described with reference to FIGS. 18 to 20.
The same components as those in the above-described embodiment will be omitted in detail, and only the differences will be described below.

As shown in FIG. 18, the manufacturing method of the bottle can B of the present embodiment includes a plate material punching process S01, a cutting process (squeezing process) S02, a DI process (squeezing ironing process) S03, a trimming process S04, and printing / painting ( Can outer surface) process S05, painting (can inner surface) process S06, bottom reform process S27, necking process S28, trimming process S29, screw forming process S30, final necking process S31, final trimming process (trimming process) S32, curl process S33 and The throttle process S34 is provided.

Also in the method for manufacturing the bottle can B of the present embodiment, the bottom reform step S27 is performed before the final trimming step S32. That is, the (final) trimming step S32 is performed after the bottom reform step S27. In the present embodiment, unlike the above-described embodiment, the bottom reforming step S27 is performed in the bottom reforming apparatus provided in the previous step of the bottle can manufacturing apparatus 1.

Next, the bottom remodeling device and the bottom remodeling mechanism 74 used for the bottom remodeling device will be described. Among the bottom remodeling devices, the structures other than the bottom remodeling mechanism 74 described in the present embodiment are, for example, the same as the can bottom remodeling device described in Patent Document 1 (US Pat. No. 5,704,241) described above. Structures can be used. Therefore, in the present embodiment, the description of the well-known structure of the bottom reforming device will be omitted.

The bottom remodeling mechanism 74 forms a concave portion 60 recessed outward in the radial direction on the inner peripheral wall 57 of the annular convex portion 56 in the can bottom 52 of the work can (DI can) W supplied to the bottom remodeling device (). See FIG. 3).

As shown in FIGS. 19A and 19B, the bottom reform mechanism 74 approaches and separates from the can bottom 52 in the can axial direction, and has a bottom support member 78 that can come into contact with the can bottom 52. The top support member 76, which is close to and separated from the open end 51a of the can body 51 in the can axis direction and can come into contact with the open end 51a, and the annular convex portion 56 of the can bottom 52 are orthogonal to the can axis. It is provided with a pressing portion 80 that is close to and separated from the can diameter direction and is capable of contacting the inner peripheral wall 57.
The central axes of the bottom support member 78 and the top support member 76 are arranged coaxially with the can axis of the can W to be bottom-reformed. Further, the can shaft of the can W is arranged coaxially with the spindle shaft C described later.

The bottom support member 78 includes an end portion of the can cylinder 51 on the can bottom 52 side (lower end portion of the can cylinder 51) and an outer edge of the can bottom 52 of the annular convex portion 56 in the can axial direction (that is, the annular convex portion). The lower end edge of 56. The nose portion 59) and the outer peripheral wall 58 of the annular convex portion 56 of the can bottom 52 are configured to be supportable.

The top support member 76 includes an inner fitting portion 90 inserted into the open end portion 51a of the can W, and an edge holding portion 91 that abuts on the open end portion 51a from the can axial direction.
The inner fitting portion 90 has a columnar shape, and has an outer diameter equal to or smaller than the inner diameter of the open end portion 51a of the can W. The inner fitting portion 90 includes a guide portion 92 and a fitting portion 93. The guide portion 92 is arranged at the end of the inner fitting portion 90 on the bottom support member 78 side along the central axis direction of the top support member 76, and has a tapered shape in which the outer diameter gradually decreases toward the bottom support member 78 side. Is doing. In FIG. 19A, of the acute and obtuse angles formed by the intersection of the guide portion 92 (extension line) and the central axis of the top support member 76 (corresponding to the spindle axis C), the acute angle is For example, it is about 15 °. The fitting portion 93 is arranged between the guide portion 92 and the edge holding portion 91, and the outer diameter is constant along the central axis direction.

The edge holding portion 91 has a disk shape, and has an outer diameter larger than the outer diameter of the inner fitting portion 90 and the open end portion 51a of the can W. The end surface of the edge holding portion 91 facing the bottom support member 78 side along the central axis direction of the top support member 76 has a ring-shaped flat shape.
When the top support member 76 is moved closer to the can W in the can axis direction and the inner fitting portion 90 is inserted into the open end portion 51a of the can body 51, the guide portion 92 is first moved to the open end portion 51a. It is inserted into the 51a, and the fitting portion 93 is inserted (fitted) into the open end portion 51a so as to be guided by the guide portion 92. Then, as shown in FIG. 19B, the end surface of the edge holding portion 91 comes into contact with the open end portion 51a of the can W.

The pressing portion 80 of the present embodiment is a forming roller. The pressing portion 80 is a molding die having a disk shape, a cylindrical shape, or a columnar shape, and its central axis C1 extends in parallel with each central axis (spindle axis C) of the top support member 76 and the bottom support member 78. ing. The pressing portion 80 is provided on the bottom spindle 77 so as to be rotatable around the central axis C1 and slidable in the radial direction orthogonal to the central axis C1.

Next, a schematic configuration of the bottom remodeling device and the operation of the bottom remodeling mechanism 74 used for the structure will be described.
Although not particularly shown, the bottom reforming device holds a device frame that serves as a base of the device, a rotating shaft that is supported by the device frame and driven to rotate, and a can W that is supported by the rotating shaft and holds a can W on the outer periphery. It includes a star wheel (turret) having a plurality of pockets formed therein, and a plurality of bottom reform mechanisms 74 supported by the rotating shaft and provided corresponding to each pocket of the star wheel.

The can body 51 of the can W is held in each pocket of the star wheel by air adsorption or the like. By rotating the rotating shaft around the central axis of the device frame, the star wheel and the bottom reform mechanism 74 integrally provided on the rotating shaft are rotated around the central axis of the rotating shaft.

The bottom reform mechanism 74 supports the top spindle 75 having the top support member 76 that abuts on the open end 51a of the can W from the can axis direction and supports the open end 51a, and the can bottom 52 of the can W. It includes a bottom spindle 77 having the bottom support member 78. The top spindle 75 and the bottom spindle 77 are arranged so as to face each other with a star wheel pocket in between and separated from each other in the spindle axis C direction (direction in which the spindle axis C extends), which is a common axis with each other.
The spindle shaft C of the top spindle 75 and the central shaft of the top support member 76, and the central shaft of the spindle shaft C and the bottom support member 78 of the bottom spindle 77 are on the can shaft of the can W held in each pocket of the star wheel. On the other hand, they are arranged coaxially.

The bottom spindle 77 includes a bottom cam follower. The bottom cam follower is integrally provided on the device frame, is arranged radially outside the rotation shaft, and engages with a cylindrical cam extending around the central axis of the rotation shaft.
This cylindrical cam forms a predetermined trajectory whose position along the central axis direction changes toward the direction of the central axis of the rotation axis. By guiding the bottom cam follower along this trajectory, the bottom cam follower reciprocates within a range of a predetermined stroke L1 along the spindle axis C direction. Further, the bottom support member 78 connected to the bottom cam follower also reciprocates within a range of a predetermined stroke L1 along the spindle axis C direction.

The bottom spindle 77 includes the pressing portion 80 capable of contacting the can bottom 52 of the can W held by the bottom support member 78. The pressing portion 80 is connected to a pressing cam follower of the bottom spindle 77. The pressing cam follower is integrally provided on the device frame, is arranged on the radial outer side of the rotating shaft, and is engaged with a cylindrical cam extending around the central axis of the rotating shaft.
This cylindrical cam forms a predetermined trajectory whose position along the central axis direction changes toward the direction of the central axis of the rotation axis. By guiding the pressing cam follower along this trajectory, the pressing cam follower reciprocates along the spindle axis C direction within a predetermined stroke L2 larger than the stroke L1. Then, the pressing portion 80 reciprocates within a range of a predetermined stroke L1 along the spindle axis C direction, and due to the action of the link portion 82 provided on the bottom spindle 77, the difference between the stroke L2 and the stroke L1 (L2). In the range of the stroke in which the linear motion in the spindle axis C direction is converted into the slide movement in the spindle radial direction orthogonal to the spindle axis C according to −L1), the spindle reciprocates in the spindle radial direction as well.
As a result, the pressing portion 80 can press the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 of the can W held by the bottom support member 78.

Further, the device frame is provided with a drive gear that is coaxial with the rotating shaft and is rotatable around the central axis with respect to the rotating shaft. Further, the bottom spindle 77 is provided with a driven gear that meshes with the drive gear. By rotating the driven gear around the spindle shaft C by the drive gear, the pressing portion 80 connected to the driven gear rotates about the spindle shaft C with respect to the bottom support member 78.

The top spindle 75 includes a top cam follower. The top cam follower is integrally provided on the device frame, is arranged radially outside the rotation shaft, and engages with a cylindrical cam extending around the central axis of the rotation shaft.
This cylindrical cam forms a predetermined trajectory whose position along the central axis direction changes toward the direction of the central axis of the rotation axis. By guiding the top cam follower along this trajectory, the top spindle 75 reciprocates within a range of a predetermined stroke L3 along the spindle axis C direction. However, the top support member 76 of the top spindle 75 is brought into contact with the open end 51a of the can W in the middle of the stroke L3, and after this contact, the elastic member acts to further advance toward the can W. The movement is stopped. Therefore, the stroke L4 of the top support member 76 is set smaller than the stroke L3.

Next, an example of the operation of the bottom reform device will be described.
The rotary drive force input from the drive motor causes the rotary shaft to rotate around its central axis. In response to this, the bottom spindle 77 and its bottom support member 78 are directed toward the can W held in the pocket of the star wheel by the action of the cylindrical cam of the device frame, the bottom cam follower engaged with the cylindrical cam, and the pressing cam follower. Moves forward in the direction of the spindle axis C. That is, the bottom spindle 77 moves toward the top spindle 75 side along the spindle axis C direction by the stroke L1.
As a result, the bottom wall of the bottom support member 78 comes into contact with the nose portion 59 and the outer peripheral wall 58 of the can bottom 52 of the can W from the spindle axis C direction, and the end portion of the can body 51 on the can bottom 52 side. The vicinity fits inside the peripheral wall of the bottom support member 78. Further, the pressing portion 80 is arranged close to the can bottom 52 of the can W. Specifically, the outer peripheral edge portion (flange portion) of the pressing portion 80 is arranged to face the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 from the inside in the spindle radial direction.

Further, due to the action of the cylindrical cam of the device frame and the cam follower for the top engaged with the cylindrical cam, the top spindle 75 and its top support member 76 advance in the spindle axis C direction toward the can W held in the pocket of the star wheel. Moving. That is, the top spindle 75 moves toward the bottom spindle 77 side along the spindle axis C direction by the stroke L3.
In the middle of the stroke L3, the inner fitting portion 90 of the top support member 76 fits into the open end portion 51a of the can body 51 of the can W, and the end edge holding portion 91 fits into the open end portion 51a of the can W. Abuts from the spindle axis C direction. After the edge holding portion 91 of the top support member 76 comes into contact with the open end portion 51a of the can W in this way, the elastic member elastically deforms according to the amount of forward movement of the top spindle 75 thereafter. The forward movement of the top support member 76 toward the bottom spindle 77 side (the can W side held by the star wheel) along the spindle axis C direction beyond that is stopped. As a result, the top support member 76 moves toward the bottom spindle 77 side along the spindle axis C direction by a stroke L4 smaller than the stroke L3.

As a result, the can W is sandwiched by the bottom support member 78 and the top support member 76 from both sides in the spindle axis C direction. At this time, the can W is supported by both support members 78 and 76 in a state of being pressurized in the can axis direction (spindle axis C direction) by the restoring deformation force of the elastic member.

Next, the pressing cam follower moves forward toward the top spindle 75 side along the spindle axis C direction according to the difference (L2-L1) between the stroke L2 and the stroke L1. At this time, the link portion 82 connected to the pressing cam follower converts the linear motion of the pressing cam follower in the spindle axis C direction into a slide movement in the spindle radial direction. As a result, the pressing portion 80 connected to the link portion 82 is moved outward in the radial direction of the spindle, and the outer peripheral edge portion (flange portion) of the pressing portion 80 is inside the annular convex portion 56 of the can bottom 52. Pressed by the peripheral wall 57, the inner peripheral wall 57 is formed with a recess 60 that is recessed outward in the can radial direction (see FIG. 3).

Further, when the drive gear rotates the driven gear around the spindle shaft C, the link portion 82 and the pressing portion 80 connected to the driven gear rotate around the spindle shaft C. As a result, the pressing portion 80 rolls on the inner peripheral wall 57 of the annular convex portion 56, and the inner peripheral wall 57 is formed with a ring-shaped concave portion 60 extending along the can peripheral direction.

After that, in the reverse procedure of the above, the pressing portion 80 first retracts from the inner peripheral wall 57 toward the inside in the spindle radial direction. Further, the top spindle 75 and the bottom spindle 77 move backward with respect to the can W in the spindle axis C direction, respectively, and the support state of the can W by the top support member 76 and the bottom support member 78 is released.

In this way, the can W whose bottom 52 has been bottom-reformed by the bottom remodeling device has a bottle can manufacturing device 1 (however, a bottom remodeling mechanism 13) installed in a subsequent step of the bottom remodeling device. It is transferred to (not available) and subjected to various molding processes to produce a bottle can B.

Also in the method for producing the bottle can B of the present embodiment described above, the same effects as those of the above-described embodiment can be obtained.

Further, in the present embodiment, since the top support member 76 has the inner fitting portion 90 and the edge holding portion 91, the following effects are exhibited.
That is, since the end edge holding portion 91 abuts on the open end portion 51a of the can W (the upper end opening edge of the can W) from the can axis direction, the stroke L4 of the top support member 76 can be suppressed to a small size. Productivity can be increased. Further, since the inner fitting portion 90 is inserted (fitted) into the open end portion 51a of the can W, the centering property of the can W can be improved and the molding accuracy can be improved.
Further, since the inner fitting portion 90 has the tapered guide portion 92, the guide portion 92 is first securely inserted into the open end portion 51a, and the guide portion 92 allows the can shaft of the can W and the top support member. The fitting portion 93 can be smoothly fitted into the opening end portion 51a from the state where the central axis of the 76 is aligned. Therefore, the support state of the open end 51a of the can W by the top support member 76 is stable. Further, since the fitting portion 93 is fitted in the opening end portion 51a, it is possible to suppress a decrease in the internal pressure of the can W during molding and keep the internal pressure high.

20 (a) and 20 (b) show a modification of the top support member 76 described in this embodiment. In this modification, the top support member 76 is the bottom support member 78 from the inner fitting portion 90, the end edge pressing portion 91, and the end edge pressing portion 91 (outer peripheral edge) along the central axis direction of the top support member 76. It is formed so as to project toward the side and cover the inner fitting portion 90 from the outside in the radial direction, and a gap equal to or larger than the plate thickness of the open end portion 51a of the can W is provided between the inner fitting portion 90 and the inner fitting portion 90. It is provided with an arranged tubular outer fitting portion 94.

The outer fitting portion 94 has an inner diameter equal to or larger than the outer diameter of the open end portion 51a of the can W. The outer fitting portion 94 includes a guide portion 95 and a fitting portion 96. The guide portion 95 is arranged at the end of the outer fitting portion 94 on the bottom support member 78 side along the central axis direction of the top support member 76, and has a tapered shape in which the inner diameter gradually increases toward the bottom support member 78 side. I'm doing it. In FIG. 20A, of the acute and obtuse angles formed by the intersection of the guide portion 95 (extension line) and the central axis of the top support member 76 (corresponding to the spindle axis C), the acute angle is For example, it is about 15 °. The fitting portion 96 is arranged between the guide portion 95 and the edge holding portion 91, and has a constant inner diameter along the central axis direction.

According to this modification, in addition to the above-mentioned action and effect, the following action and effect can be obtained. That is, since the outer fitting portion 94 has the tapered guide portion 95, the guide portion 95 is first securely externally inserted into the open end portion 51a, and the guide portion 95 allows the can shaft of the can W and the top support member 76. The fitting portion 96 can be smoothly fitted onto the opening end portion 51a from the state where the central axis of the above is aligned. Therefore, the support state of the open end 51a of the can W by the top support member 76 is stable. Further, since the fitting portion 96 fits outside the opening end portion 51a, it is possible to suppress a decrease in the internal pressure of the can W during molding and keep the internal pressure high.

The present invention is not limited to the above-described embodiment, and as described below, various modifications can be made without departing from the spirit of the present invention.

In the first to third embodiments described above, in the bottom reforming step, the pressing portions 20 and 80 of the bottom reforming mechanisms 13 and 74 press the inner peripheral wall 57 of the annular convex portion 56 of the can bottom 52 of the can W. It was decided to mold the recess 60 and perform bottom reform processing, but the present invention is not limited to this.
For example, the pressing portions 20 and 80 may press the outer peripheral wall 58 of the annular convex portion 56 of the can bottom 52 of the can W, and the concave portion 60 may be formed on the outer peripheral wall 58 to perform bottom reform processing.
Alternatively, the pressing portions 20 and 80 may be pressed against both the inner peripheral wall 57 and the outer peripheral wall 58 of the annular convex portion 56 of the can bottom 52 to form the concave portions 60 in the inner peripheral wall 57 and the outer peripheral wall 58, respectively. Good.

Further, although the pressing portions 20 and 80 are formed rollers, the present invention is not limited to this. That is, the pressing portions 20 and 80 may be punch claws as shown in, for example, Patent Document 4 (Japanese Patent Laid-Open No. 11-244972) and Patent Document 5 (Japanese Patent Laid-Open No. 2000-197937) described above. ..
In this case, since the pressing portions 20 and 80 are punch claws, the structure for moving the pressing portions 20 and 80 with respect to the can W in the can axial direction and the can radial direction can be simplified, and by a simple operation. The recess 60 can be quickly formed in the can bottom 52. Therefore, the processing speed of the bottom reform processing on the can bottom 52 is increased.

Further, in the first to third embodiments, in the manufacturing flow of the bottle can B, the final necking step is provided between the screw forming step and the final trimming step, but the final necking step is not provided. Good.
Further, the screw forming step may not be provided. That is, the bottle can B may be a bottle can without screws. In this case, the cap may be detachably attached to the base portion 53 of the bottle can B by fitting by winding or the like.

Further, in the first embodiment, the bottom reform mechanism 13 provided in the bottle can manufacturing apparatus 1 is positioned corresponding to the chuck 7A facing the die processing tool among the plurality of processing tools 6 provided in the processing table 2. Although it is said that it is arranged in, it is not limited to this.
That is, in the first embodiment, when the bottom reforming mechanism 13 is used to perform bottom reforming on the bottom 52 of the can W, the open end 51a of the can body 51 of the can W is pressed while being molded by a die processing tool. However, instead of this, the open end portion 51a of the can W may be pressed while being molded by a rotary processing tool. Alternatively, for example, the opening end portion 51a of the can W may be pressed by a pressing member provided on the processing table 2 without molding. Further, the holding member may not be provided. That is, in the bottle can manufacturing apparatus 1, the chuck 7 is provided with a telescopic ring 17 that can be elastically deformed by air pressure, and the telescopic ring 17 sufficiently secures the holding force of the can W. Therefore, the can W It is also possible to perform bottom reform processing without pressing the open end portion 51a of.

Further, in the first embodiment, the discharge means 43 provided in the bottle can manufacturing apparatus 1 reciprocates the extrusion portion 40 in the direction of the central axis O of the chuck 7 from the first elevating portion 41 and the first elevating portion 41. A configuration including a second elevating portion 42 for reciprocating the extruded portion 40 in the central axis O direction of the chuck 7 at a slow speed (that is, having two elevating portions) has been described as an example. It is not limited to.
That is, the discharging means 43 may, for example, reciprocate the extruded portion 40 in the central axis O direction of the chuck 7 by one elevating portion, or the speeds at which the extruded portion 40 is moved in the central axis O direction are different from each other. The extrusion portion 40 may be reciprocated in the central axis O direction of the chuck 7 by three or more elevating portions.

Further, in the first embodiment, a configuration in which the machining table 2 is reciprocated with respect to the holding table 3 in the table axis TA direction by the crank mechanism 8 has been described as an example, but a linear motor other than the crank mechanism 8, for example, has been described. A reciprocating mechanism such as a mechanism may be used.

Further, in the first to third embodiments, the method for producing the bottle can B has been described, but the method for producing the can of the present invention may be a method for producing, for example, a DI can other than the bottle can. In the case of the DI can manufacturing method, the can manufacturing method in FIG. 1 includes steps S01 to S06, and also includes a bottom reforming step between the DI step S03 and the trimming step S04. That is, the bottom reforming step is performed before the trimming step S04. In other words, the trimming step S04 is performed after the bottom reform step. As a result, the same effect as that of the above-described embodiment can be obtained in the method for producing a DI can.

Specifically, in FIGS. 1 and 2 (c) and 2 (d), the trimming step S04 for trimming the open end 51a of the can body 51 of the can W is formed on the annular convex portion 56 of the can bottom 52. It is performed after the bottom reforming step (not shown) in which the reforming process is performed. That is, in the bottom remodeling step, it is conceivable that the height of the can W in the can axial direction (total height of the can W) may change due to the bottom remodeling process on the can bottom 52, as in the present invention. In addition, when the trimming process is performed after the bottom reform process, the height accuracy of the open end portion 51a of the can W after the trimming process in the can axial direction is stably ensured. As a result, even during the production of the DI can, the sealed state of the can when the can lid is attached to the open end portion 51a of the can body 51 is stabilized in the post-process after the can W is manufactured.
Further, the method for producing a can of the present invention can be applied to cans other than the above-mentioned bottle cans and DI cans as long as they are bottomed tubular cans having a can body and a can bottom.

In addition, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined as long as it does not deviate from the gist of the present invention, and addition, omission, replacement, and other configurations may be added. It can be changed. Further, the present invention is not limited by the above-described embodiments, but is limited only by the scope of claims.

According to the can manufacturing method of the present invention, it is possible to stably secure the height accuracy of the can in the can axial direction while performing bottom reform processing on the bottom of the can, thereby reducing the weight of the can and sealing it. It is possible to achieve both stabilization and stabilization. Therefore, it has industrial applicability.

51 Can body 51a Open end 52 Can bottom 53 Mouthpiece 54 Neck 56 Circular convex 57 Inner peripheral wall 58 Outer wall 60 Concave shape formed by bottom reform processing B Bottle can (can)
S02 Cupping process (squeezing process)
S03 DI process (squeezing ironing process)
S04 Trimming process S07, S17, S28 Necking process S09, S21, S27 Bottom reform process S10, S19, S30 Screw forming process S12, S22, S32 Final trimming process (trimming process)
W0 blank W1 cup-shaped body W2 to W5 (W) can (intermediate molded body can. Work)

Claims (6)

Inner peripheral wall in an annular convex portion of the bottom of a bottomed tubular can having a can body and a can bottom, which protrudes from the opening end of the can body along the can axis direction toward the can bottom side. And the bottom remodeling process in which at least one of the outer peripheral walls is pressed to form a concave portion and bottom remodeling is performed.
A trimming step of performing a trimming process on the end of the opening is provided.
A method for producing a can, which comprises performing the trimming step after the bottom reform step. A cupping process in which a disk-shaped blank is drawn and formed into a cup-shaped body.
A DI step of forming a can of an intermediate molded body having a can body and a can bottom by squeezing and ironing the cup-shaped body.
A trimming step of trimming the open end of the can body and
A tapered neck portion in which the region of the can body including the open end is gradually die-processed and the diameter is gradually reduced from the can bottom along the can axis direction toward the open end side. , A necking step of forming a base portion connected to the opening end side of the neck portion, and
A screw forming process for applying a thread forming process to the base portion, and
The final trimming step of applying the final trimming process to the base portion and
Of the can bottom, at least one of the inner peripheral wall and the outer peripheral wall of the annular convex portion protruding from the open end along the can axis direction toward the can bottom side is pressed to form the concave portion and bottom reform processing. With a bottom remodeling process,
A method for manufacturing a can, wherein the bottom reforming step is performed before the final trimming step. The can manufacturing method according to claim 2.
A method for manufacturing a can, wherein the bottom reforming step is performed before the screw forming step. The can manufacturing method according to claim 2.
A method for manufacturing a can, wherein the bottom reforming step is performed after the screw forming step. The can manufacturing method according to claim 2 or 3.
A method for producing a can, wherein the bottom reforming step is performed after the necking step. The can manufacturing method according to claim 2 or 3.
A method for manufacturing a can, wherein the bottom reforming step is performed at the same time as the necking step.

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