JP6843713B2 - Can molding equipment - Google Patents

Description

The present invention relates to the removal of cutting pieces generated during molding in a can molding apparatus.

As a can body filled and sealed with contents such as beverages, a bottomed tubular can body having a can body (wall) and a can bottom (bottom) and a screw cap screwed to the open end of the can body. The bottle cans that have been made are known. The body of such a bottle can is squeezed diagonally so that the upper part is constricted, and a screw groove for screwing a screw cap is provided on the opening end side.

When manufacturing such a bottle can, for example, a metal plate made of aluminum or an aluminum alloy is drawn into a cup shape (can base material), and then re-squeezed and side walls using a can molding apparatus. Is stretched by several stages of ironing. After adjusting the height of the can body thus obtained by trimming, printing is performed on the peripheral surface of the can body. After that, a bottle can is manufactured through a necking process in which the opening end side of the can body is drawn.

In the manufacture of such bottle cans, the bottle necker, which is a can molding apparatus used in the necking process, rotates a turntable in which a large number of can body holding portions supporting the bottom side of the can body are arranged in an annular shape. Then, a large number of necking dies arranged in a ring shape on the die table so as to face each can body holding portion are sequentially pressed against the opening end side of the can body held by the can body holding portion, and the steps are performed. (For example, refer to Patent Document 1).

In such a bottle necker, after drawing the opening end side of the can body, the opening end whose height in the can axis direction is not uniform due to the drawing process is cut by a trimming tool to make it a constant height. .. After that, a curl portion is formed by rounding the trimmed opening end outward to complete the can body of the bottle can.

Conventionally, when trimming the open end of a can body in a bottle necker, the cutting piece is sucked and removed by a vacuum device or the like in order to prevent the cutting piece from being scattered due to cutting. For example, Patent Document 2 discloses a trimming device provided with a suction duct connected to a suction flow path and covering a cutting tool.

Japanese Unexamined Patent Publication No. 2008-126266 JP-A-2009-148834

However, in the bottle necker equipped with the conventional trimming tool (cutting tool), the molding tool arranged on the front stage side of the trimming tool is blocked by the suction duct extending from the suction means toward the trimming tool arranged on the die table. It was in a state of being peeled off. For this reason, there is a problem that the molding tool on the front stage side of the trimming tool, such as a screw forming tool that requires frequent maintenance, is blocked by the suction duct and the maintainability is greatly reduced. Further, this suction duct is very heavy because the whole is formed in a continuous manner, and there is a problem that workability is poor, for example, a plurality of workers are required to attach and detach the suction duct.

The present invention has been made in view of the above-mentioned circumstances, and among the molding tools arranged on the die table, the molding arranged on the front stage side of the cutting tool connected to the vacuum duct for sucking the cutting pieces. An object of the present invention is to provide a can forming apparatus capable of improving the maintainability of a tool.

In order to solve the above problems, the can forming apparatus of the present invention has a large number of can body holding portions for detachably holding the can body arranged in an annular shape on one side and can rotate around the central axis. A turntable and a die table which is arranged so as to face the turntable and has a molding tool for forming a can body arranged in an annular shape on one side and can reciprocate along the axial direction of the central axis. A can molding device including a suction mechanism for sucking and removing cutting pieces generated by processing the can body with the molding tool. The suction mechanism is connected to the suction device and one end of the suction device. The first sub-vacuum duct has a main vacuum duct and a first sub-vacuum duct that branches from the main vacuum duct and has a telescopic portion capable of following the reciprocating movement of the die table. The first sub-vacuum duct is formed. Among the tools, it is characterized by having a joint portion that extends to a cutting tool for cutting the open end of the can body and can be divided into at least two or more divided bodies.

According to the can molding apparatus of the present invention, the first sub-vacuum duct is formed during maintenance of the molding tool by forming a joint portion in the first sub-vacuum duct constituting the suction mechanism so that the first sub-vacuum duct can be divided into a plurality of divided bodies. It can be divided and removed to widen the underside of the die table. As a result, for example, a worker can easily perform maintenance work on a molding tool on the front stage side of a cutting tool, which requires frequent maintenance, without being bothered by the first sub-vacuum duct from the outside of the die table. It will be possible to do.

Further, in the present invention, the main vacuum duct is arranged so as to extend in the vertical direction in the vicinity of the die table.

Further, the present invention is characterized in that one or a plurality of second sub-vacuum ducts branching from the main vacuum duct and extending toward the molding tool are provided.

Further, in the present invention, the cutting tool is arranged in the lower part of the die table in the vertical direction, and the first subvacuum duct bends upward from the lower side of the die table toward the cutting tool. It is characterized by having a bent portion extending from the surface.

Further, the present invention is characterized in that the joint portion is formed at two positions of the first sub-vacuum duct, and the first sub-vacuum duct can be divided into three divided bodies.

According to the present invention, among the molding tools arranged on the die table, the maintainability of the molding tool arranged on the front stage side of the cutting tool connected to the vacuum duct for sucking the cutting piece can be improved.

It is a flowchart which showed the manufacturing process of a bottle can step by step. It is a schematic diagram which shows the change of the shape of a can body in each process. It is an external perspective view which shows the can molding apparatus (bottle necker). It is a top view which shows the can molding apparatus (bottle necker). It is an enlarged plan view of the main part which shows the main part of a die table and a suction mechanism. It is an enlarged sectional view of the main part which shows the trimming tool (cutting tool) which is an example of a forming tool. It is an enlarged plan view of the main part which shows the main part of a die table and a suction mechanism. It is sectional drawing which shows the telescopic part formed in the 1st sub-vacuum duct.

Hereinafter, the can molding apparatus according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments shown below is specifically described in order to better understand the gist of the invention, and is not limited to the present invention unless otherwise specified. In addition, the drawings used in the following description may be shown by enlarging the main parts for convenience in order to make the features of the present invention easy to understand, and the dimensional ratios of the respective components are the same as the actual ones. Is not always the case.

First, a series of flow of the manufacturing process of a bottle can, which is an example of a can body, will be described.
FIG. 1 is a flowchart showing an example of a bottle can manufacturing process step by step. FIG. 2 is a schematic view showing changes in the shape of the can body in each step.
For bottle cans, plate material punching process S1, cutting process (squeezing process) S2, squeezing process S3, first trimming process S4, printing / painting (can outer surface) process S5, painting (can inner surface) process S6, necking process S7, The can is manufactured through the screw forming step S8, the second trimming step S9, and the curling step S10 in this order.

In the plate material punching step S1, for example, a rolled material made of an Al alloy material is punched out to form (punch) a disk-shaped plate material (blank) W as shown in FIG. 2 (a). In the cupping step (cupping step) S2, as shown in FIG. 2B, the plate material W is drawn (cupping) by a cupping press to form a cup-shaped body (can base material) W1. In the squeezing and squeezing step S3, as shown in FIG. A shaped can body W2 is formed.

In the first trimming step S4, since the height of the opening end portion 11a of the can body W2 is non-uniform, the opening end portion 11a is trimmed using a trimming device, as shown in FIG. 2D. The trimmed can body W3, in which the height of the open end portion 11a of the can body 11 is evenly aligned over the entire circumference, is formed.

After that, the can body W3 is washed to remove lubricating oil and the like, then surface-treated and dried, and then, as shown in FIG. 2 (e), the outer surface side of the can body W3 is printed and painted. (Printing / painting (can outer surface) step S5), and then painting the inner surface side of the can body W3 (painting (can inner surface) step S6).

Next, using the neck molding die of the bottle necker, the neck portion 12 having a constricted shape so as to be smoothly inclined is molded on the opening end portion 11a side of the can body 11 (necking step S7). Further, at the open end of the neck portion 12, a screw groove 13 (see FIG. 2 (g)) matching the shape of the cap is provided in the neck portion 12 by using a rotation processing tool (molding tool) (screw molding). Step S8). Then, using a trimming tool (molding tool), trimming of the opening end portion 11b having a non-uniform height caused by screw molding or the like is performed (second trimming step S9), and the heights are evenly aligned over the entire circumference. The opened end portion 11c is formed (see FIG. 2 (h)). Then, the trimmed opening end 11c is curled outward with a curl mold (molding tool) (curl step S10). Through these steps, a can body (bottle can) 10 having a constricted neck portion 12 on one side of the can body 11 is manufactured.
The can molding apparatus of the following embodiment is a bottle necker (necking processing apparatus) in which each step from the necking step S7 to the curl step S10 is performed by a molding tool.

The can body (bottle can) 10 obtained through each of the above steps is then filled with contents such as beverages, and is further fitted with the screw groove 13 to cover the opening of the neck portion 12. Is attached, and the inside of the can body 10 is sealed.

FIG. 3 is an external perspective view showing a can molding apparatus (bottle necker) according to an embodiment of the present invention. Further, FIG. 4 is a plan view of the can molding apparatus when viewed from one side surface.
The can molding apparatus (bottle necker) 20 is used, for example, to perform each step from the necking step S7 to the curl step S10 described above, and can rotate around the main body 21 and the table shaft TA of the main body 21. A turntable 23 provided in the above, and a die table 24 arranged so as to face the turntable 23 are provided.
Further, the can forming apparatus 20 is provided with a suction mechanism 50 for sucking and removing cutting pieces generated by a specific molding tool 40 of the die table 24.

The main body 21 supports the turntable 23 and the die table 24. The main body 21 includes a rotation mechanism (not shown) that rotates the turntable 23 around the table shaft TA, and a reciprocating mechanism (not shown) that reciprocates the die table 24 along the axis of the table shaft TA with a predetermined width. (Not shown) is provided.

In the turntable 23, for example, a large number of can body holding portions 31 capable of holding the bottom portion of the can body are arranged in an annular shape on one surface side 23a of the table body (base material) 23A provided with a ring-shaped flat plate. Consists of. The turntable 23 is rotatably supported by an index (not shown) provided on the main body 21, and intermittently rotates around the table shaft TA. In this embodiment, the turntable 23 rotates in the counterclockwise direction Q in FIG.

The die table 24 is composed of, for example, a ring-shaped table body 24A in which a large number of molding tools 40 are arranged in an annular shape on one side 24a facing the turntable 23.

The die table 24 repeats approaching and separating movements with respect to the turntable 23 along the table axis TA by a reciprocating mechanism (not shown) provided in the main body 21 with a predetermined width. Then, after the completion of one stroke (reciprocating movement) consisting of the approaching movement and the separating movement, and before the start of the next one stroke, the turntable 23 has a predetermined amount along the circumferential direction, for example, a molding tool for the opposing die table 24. It rotates in the counterclockwise direction Q by one.

Then, the open end side of the can body W3 whose bottom portion is held by the can body holding portion 31 is shaped by the molding tool 40 for each stroke in which the die table 24 and the turntable 23 are brought close to each other.

FIG. 5 is an enlarged plan view of a main part showing a die table.
In the present embodiment, the table body 24A of the die table 24 has a disk shape or a circular ring shape. Specifically, the die table 24 is arranged coaxially with the inner ring body 41 connected to the connecting shaft 29 (see FIGS. 3 and 4) of the main body 21 and outside in the table radial direction with respect to the inner ring body 41. The outer ring body 42, and a plurality of ribs 43 that connect the inner ring body 41 and the outer ring body 42 to each other in the radial direction of the table and are arranged at intervals in the circumferential direction of the table are provided.

A plurality of molding tools 40 are arranged along the circumferential direction on the outer ring body 42 of the die table 24. In order to attach the molding tool 40 to the die table 24, the outer ring body 42 is provided with a plurality of attachment holes 45 along the circumferential direction of the table. The plurality of molding tools 40 can be attached to these attachment holes 45 in the order of processing into the can body.

The plurality of forming tools 40 include a die processing tool (neck forming die) 48 and a rotary processing tool 49. In the present embodiment, a large number of die processing tools 48 and a plurality of rotary processing tools 49 are detachably arranged in a plurality of mounting holes 45 of the die table 24 in the order of processing into a can body. It should be noted that some of the plurality of mounting holes 45 may be vacant spaces in which the molding tool 40 cannot be mounted.

The die processing tool 48 moves in the can axis direction (direction parallel to the table axis TA) with respect to the can, reduces the diameter of the open end side of the can body to form the neck portion 12, and draws the can body. Die processing such as diameter expansion processing for expanding the diameter of the peripheral wall is performed. One type of die processing is applied to the can by one die processing tool 48.

The rotation processing tool 49 moves around the can axis with respect to the can, and the rotation operation around the can axis causes rotation processing such as trimming processing, screw forming processing, curling processing, and throttle (curl caulking) processing on the peripheral wall of the can. Is given. Rotation processing is applied to the can body by one rotation processing tool 49.

The rotary processing tool 49 has a molding portion for rotating the can and a tool spindle for rotatably supporting the can body. Further, although not particularly shown, the tool spindle (spindle shaft portion) is connected to the drive motor via a transmission member such as a belt. The drive motor is arranged on the die table 24. The tool spindle (spindle shaft portion) is rotated by a rotational driving force transmitted from the driving motor, and the molding portion performs rotational processing on the can body by utilizing this rotational force.

Of the plurality of rotary machining tools 49 shown in FIG. 5, reference numeral 49A is a screw forming tool that forms a thread groove 13 (see FIG. 2 (g)) on the opening side of the neck portion 12 formed by the die machining tool 48. is there. Further, reference numeral 49B is obtained by trimming the opening end portion 11b (see FIG. 2 (g)) having a non-uniform height generated by the screw forming tool 49A located on the front stage side, so that the height is evenly distributed over the entire circumference. A trimming tool (cutting tool) that forms the aligned open end 11c (see FIG. 2 (h)). Reference numeral 49C is a curl tool that curls the opening end portion 11c (see FIG. 2H) having a uniform height formed by the trimming tool (cutting tool) 49B arranged on the front stage side to the outside. is there.

Such a screw forming tool 49A, a trimming tool (cutting tool) 49B, and a curl tool 49C correspond to the vicinity of the portion immediately before the position where the can body is separated from the turntable 23 after the processing is completed, in the vertical direction of the die table. It is arranged at the bottom of.

FIG. 6 is an enlarged cross-sectional view showing an example of a trimming tool (cutting tool) which is a molding tool.
The trimming tool (cutting tool) 49B is arranged inside the cutting tool 61 for cutting the opening end portion 11b having an uneven height of the can body 10 and the opening end portion 11c of the can body 10, and the opening end portion 11c. It is provided with a guide unit 62 for guiding the above. Further, the guide portion 62 is covered with a cover portion 67 formed at one end of a first sub-vacuum duct 53 constituting a suction mechanism 50 for sucking the cutting piece P generated during the trimming process.

Further, below the trimming tool (cutting tool) 49B, a can body holding portion 31 (see FIG. 3) formed on the turntable 23 for holding the bottom portion of the can body 10 is arranged. When the turntable 23 is rotated together with the can body 10, the guide portion 62 is inserted into the open end portion 11b of the can body 10, whereby the can shaft of the can body 10 is trimmed by the trimming tool (cutting tool) 49B. It is designed to substantially match the rotation axis O.

Here, the cutting tool 61 and the guide portion 62 are arranged on the main body portion 64 rotatably supported around the rotation axis O. The main body portion 64 has a substantially cylindrical multi-stage shape, and has a large diameter portion 64a, a medium diameter portion 64b, and a small diameter portion 64c coaxially with respect to the rotation axis O in order from the upper part to the lower part of FIG. It is composed.
The upper portion of the large-diameter portion 64a is connected to a drive portion 65 that rotatably supports the main body portion 64 around the rotation axis O, and the tip end portion, that is, the blade portion of the cutting tool 61 protrudes from the lower end surface thereof. In this state, the cutting tool 61 is arranged inside the cutting tool 61. In this embodiment, the cutting tools 61 are arranged at three locations on the same circumference centered on the rotation axis O.

Further, a guide portion 62 is arranged on the outer peripheral surface side of the small diameter portion 64c, and a bearing 66 is arranged between the outer peripheral surface of the small diameter portion 64c and the inner peripheral surface of the guide portion 62. That is, the outer peripheral surface of the small diameter portion 64c and the inner peripheral surface of the bearing 66 are in contact with each other, and the inner peripheral surface of the guide portion 62 and the outer peripheral surface of the bearing 66 are in contact with each other. The portion 64 is rotationally driven around the rotation axis O together with the inner peripheral surface of the bearing 66, but the guide portion 62 is not substantially rotationally driven.

The guide portion 62 is formed in a cylindrical shape, and when the guide portion 62 is arranged in the main body portion 64, the inside of the tip portion of the guide portion 62 is a space portion 62a that opens to the tip surface of the guide portion 62. An air bleeding flow path 62b communicating with the space portion 62a is formed on the side surface of the tip portion of the guide portion 62.

At one end of the first sub-vacuum duct 53 constituting the suction mechanism 50, a cover portion 67 in which the cutting tool 61 and the guide portion 62 are arranged is formed, and the cover portion 67 is the first sub-vacuum duct. It is connected to the suction device 51 (see FIG. 1) of the suction mechanism 50 via 53. In this configuration, the cutting tool 61 and the guide portion 62 are arranged at positions facing the open end portion 53a of the first sub-vacuum duct 53, whereby the cutting piece generated by the cutting tool 61 is the first sub. It is designed to be sucked well through the vacuum duct 53.

An insertion / removal hole 67b, which is a through hole, is formed on the lower end surface 67a of the cover portion 67. The open end portion 11c of the can body 10 is inserted and removed from the insertion / removal hole 67b into the cover portion 67. The opening peripheral edge portion of the insertion / removal hole 67b is a cutting piece shielding plate 67c extending toward the outer peripheral surface of the opening end portion 11c of the can body 10.

In the above configuration, the guide portion 62 is arranged inside the cover portion 67 so that the tip portion thereof is located outside the cover portion 67 from the insertion / removal hole 67b, and is formed at the tip portion of the guide portion 62. The air bleeding flow path 62b is opened on the side surface of the tip end portion of the guide portion 62 located outside the cover portion 67.

Such a trimming tool (cutting tool) 49B is driven forward toward a can body 10 which has been threaded by, for example, a screw forming tool 49A (see FIG. 5) in the previous stage of the trimming process. As a result, the guide portion 62 is inserted from the open end portion 11c of the can body 10, and the inner peripheral surface of the open end portion 11c is guided by the outer peripheral surface of the guide portion 62, thereby trimming the can shaft of the can body 10. (Cutting tool) The opening end 11c of the can body 10 is brought into contact with the cutting edge of the cutting tool 61 while substantially matching the rotation axis O of 49B.

After that, the drive unit 65 is driven by a control unit (not shown), the main body unit 64 is rotationally driven around the rotation axis O, and the cutting bit 61 arranged on the main body unit 64 is rotated around the rotation axis O. It is driven so that the cutting tool 61 cuts the open end portion 11c of the can body 10 at a predetermined height. Here, since the guide portion 62 is arranged on the main body portion 64 via the bearing 66, the can body 10 is not driven to rotate around the rotation axis O and is cut by the cutting tool 61, that is, during the trimming process. Deformation of the open end portion 11c of the above is suppressed, and the precision of this processing can be improved.

During such trimming, the generated cutting piece P is continuously sucked from one end of the first sub-vacuum duct 53 constituting the suction mechanism 50, while the rotation axis O is caused by the shape of the cutting piece P and the like. As for the cutting piece that is about to fall downward in the direction, the peripheral portion of the insertion / removal hole 67b is the cutting piece shielding plate 67c, so that the outflow from the first sub-vacuum duct 53 is suppressed.

With reference to FIGS. 3 and 5 again, the suction mechanism 50 includes a suction device 51, a main vacuum duct 52, and a first sub-vacuum duct 53 branched from the main vacuum duct 52.
The suction device 51 may be any device that can suck metal cutting pieces, such as a vacuum suction machine provided with a filter.
One end of the main vacuum duct 52 is connected to the suction device 51. The main vacuum duct 52 of the present embodiment is, for example, a substantially cylindrical member arranged so as to extend in the vertical direction in the vicinity of the die table 24 of the can molding apparatus (bottle necker) 20.

In the present embodiment, the first sub-vacuum duct 53 branches at a right angle from the main vacuum duct 52, extends parallel to the table shaft TA of the main body 21, and bends downward from the die table 24 in the vertical direction. It extends along the lower side of the die table 24, and further bends upward from the lower side of the die table 24 toward the trimming tool (cutting tool) 49B. The end of the first sub-vacuum duct 53 is connected to the cover portion 67 (see FIG. 6) of the trimming tool (cutting tool) 49B.

The first sub-vacuum duct 53 can be divided into a plurality of divided bodies 53A, 53B, 53C by the joint portions 54, 54. In the present embodiment, the first sub-vacuum duct 53 can be divided into three divided bodies 53A, 53B and 53C by two joint portions 54 and 54. The joint portions 54 and 54 connect the divided bodies to each other in a detachable manner.

The joint portions 54, 54 include, for example, a ring member 57a for locking the enlarged diameter portions formed at the joint portion between the split body 53A and the split body 53B and the joint portion between the split body 53B and the split body 53C, respectively. It has a screw 57b for tightening the ring member 57a. Then, when the first sub-vacuum duct 53 is divided into the three divided bodies 53A, 53B, 53C, the first sub-vacuum duct 53 can be divided by loosening the screw 57b and removing the ring member 57a.

For example, as shown in FIG. 7, the divided body 53A, the divided body 53B, and the divided body 53C of the first sub-vacuum duct 53 are divided from the joint portions 54 and 54 and arranged under the die table 24. The formed molding tool 40, for example, the screw forming tool 49A located on the front stage side of the trimming tool (cutting tool) 49B, is easily accessed from the outside.

Further, the divided body 53C of the first sub-vacuum duct 53 is fixed to the peripheral portion of the die table 24 and fixed to the duct fixing plate 28 (see FIG. 5) extending outward. As a result, the portion of the first sub-vacuum duct 53 connected to the trimming tool (cutting tool) 49B from the expansion / contraction portion 55, which will be described later, reciprocates along the table shaft TA together with the die table 24.

Further, the split body 53C is provided with a bent portion that is bent upward from the lower side of the die table 24 toward the trimming tool (cutting tool) 49B at the time of mounting, and the cover of the trimming tool (cutting tool) 49B is provided at the end. A connecting portion 56 (see FIG. 7) that can be connected to the portion 67 (see FIG. 6) is formed.

In the split body 53A of the first subvacuum duct 53, a part of the split body 53A and the B split bodies 53B and 53C are placed along the table axis TA following the reciprocating motion along the table axis TA of the die table 24. It is provided with a telescopic portion 55 that enables reciprocating movement. As shown in FIG. 8, such an expansion / contraction portion 55 is formed in the middle of the divided body 53A, and includes a large-diameter pipe 55a, a small-diameter pipe 55b having a diameter smaller than that of the large-diameter pipe 55a, and a packing 55c.

A part of the small diameter pipe 55b is slidably inserted inside the large diameter pipe 55a. Further, the packing 55c is formed at the end of the large-diameter pipe 55a, and closes the outer gap between the large-diameter pipe 55a and the small-diameter pipe 55b while allowing the small-diameter pipe 55b to slide. Such packing 55c may be formed of, for example, an elastic material such as rubber.

In the telescopic portion 55 having such a configuration, the small diameter pipe 55b can slide along the table shaft TA with respect to the large diameter pipe 55a, whereby the first sub follows the reciprocating motion of the die table 24. The divided body 53A of the vacuum duct 53 can be expanded and contracted along the table shaft TA.

According to the can forming apparatus (bottle necker) 20 having the above configuration, it is generated when the trimming tool (cutting tool) 49B is used to trim the opening end 11b having an uneven height of the can body 10. The cutting piece P is sucked from the first subvacuum duct 53 connected to the trimming tool (cutting tool) 49B. Then, for example, in the portion flowing from the first sub-vacuum duct 53 into the main vacuum duct 52 (the portion where the first sub-vacuum duct 53 branches from the main vacuum duct 52), the cutting piece P stands upright in the vertical direction due to its own weight. It falls below the main vacuum duct 52 and is collected. Further, the foil-shaped light cutting piece P reaches the suction device 51 and is collected by a filter or the like formed in the suction device 51. This prevents the cutting piece P generated by the trimming tool (cutting tool) 49B from scattering to the outside.

Then, by forming joint portions 54 and 54 in the first sub-vacuum duct 53 constituting the suction mechanism 50 described above so that the joint portions 54 and 54 can be divided into a plurality of divided bodies 53A, 53B and 53C, the first sub-vacuum duct is used during maintenance. The 53 can be divided and removed to leave a large space under the die table 24 (see FIG. 7). As a result, for example, the operator can perform the first sub-vacuum duct from the outside of the die table 24 with respect to the screw forming tool 49A arranged on the front stage side of the trimming tool (cutting tool) 49B, which requires frequent maintenance. Maintenance work can be easily performed without being bothered by 53.

Further, by making the first sub-vacuum duct 53 divisible into a plurality of divided bodies 53A, 53B, 53C, the first sub-vacuum duct 53, which is heavy as a whole, is treated as a relatively light divided body 53A, 53B, 53C. This makes it possible to easily remove and attach the first sub-vacuum duct 53 during maintenance of the trimming tool (cutting tool) 49B. As a result, the trimming tool (cutting tool) 49B can be easily accessed, and the maintenance of the trimming tool (cutting tool) 49B becomes easy.

Further, a configuration in which one or a plurality of second sub-vacuum ducts are branched from the main vacuum duct 52 in addition to the first sub-vacuum duct 53 is also preferable. For example, in FIGS. 5 and 7, a second sub-vacuum duct 59 is further branched from the main vacuum duct 52 in addition to the first sub-vacuum duct 53. Such a second sub-vacuum duct 59 extends toward an arbitrary molding tool 40 formed on the die table 24. The second sub-vacuum duct 59 is preferably connected to, for example, a molding tool 40 (rotational processing tool 49 in the examples shown in FIGS. 5 and 7) in which cutting pieces and paint pieces are generated during processing.

The second sub-vacuum duct 59 may be formed of a swingable pipe such as a bellows pipe, for example, without forming a telescopic portion that follows the reciprocating movement of the die table 24 as in the first sub-vacuum duct 53. it can. Further, the second sub-vacuum duct 59 does not follow the reciprocating movement of the die table 24, and the tip of the second sub-vacuum duct 59 is connected (approached) to the molding tool 40 only when the die table 24 is retracted, for example. There may be. By making the second sub-vacuum duct 59 also separable by the joint portion, it becomes easy to access each molding tool from the front surface of the die table 24 at the time of maintenance.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... Can body (bottle can)
20 ... Can molding device (bottle necker)
21 ... Main body 23 ... Turntable 24 ... Die table 40 ... Molding tool 49A ... Screw forming tool 49B ... Trimming tool (cutting tool)
50 ... Suction mechanism 51 ... Suction device 52 ... Main vacuum duct 53 ... First sub-vacuum duct 53A, 53B, 53C ... Split body 54 ... Joint part 55 ... Telescopic part 59 ... Second sub-vacuum duct

Claims (5)

A large number of can body holding parts that hold the can body detachably are arranged in an annular shape on one side, and a turntable that can rotate around the central axis and a turntable that faces the turntable are arranged so that the cans can be placed. A die table in which molding tools for molding a body are arranged in an annular shape on one side and can reciprocate along the axial direction of the central axis, and a cutting piece produced by processing the can body with the molding tool. A can molding device equipped with a suction mechanism for suction removal.
The suction mechanism includes a suction device, a main vacuum duct whose one end is connected to the suction device, and a first sub-vacuum having a telescopic portion that branches from the main vacuum duct and can follow the reciprocating movement of the die table. With a duct,
The first sub-vacuum duct is provided with a joint portion that extends to a cutting tool that cuts an open end of the can body of the molding tool and can be divided into at least two or more divided bodies. A featured can molding device. The can molding apparatus according to claim 1, wherein the main vacuum duct is arranged so as to extend in the vertical direction in the vicinity of the die table. The can molding apparatus according to claim 1 or 2, further comprising one or a plurality of second sub-vacuum ducts branching from the main vacuum duct and extending toward the molding tool. The cutting tool is arranged in the lower part of the die table in the vertical direction, and the first sub-vacuum duct has a bent portion that bends upward and extends from the lower side of the die table toward the cutting tool. The can forming apparatus according to any one of claims 1 to 3, wherein the can forming apparatus is provided. One of claims 1 to 4, wherein the joint portion is formed at two positions of the first sub-vacuum duct, and the first sub-vacuum duct can be divided into three divided bodies. The can molding apparatus described.

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