Rotation processing tool and can production device

Abstract

To provide a rotation processing tool which can inhibit occurrence of film peeling during processing by a rotation processing tool even when an inner surface film of a can is thick, and to provide a can production device.SOLUTION: A rotation processing tool 30 performs processing to an opening of a can having a cylindrical shape and includes: a bore guide 38 which is inserted into the opening of the can along an axial direction in which a center axis C of the rotation processing tool 30 extends; rotation restriction means 41 which restricts rotation of the bore guide 38 around the center axis C; and processing means 39 which is disposed at the radial outer side of the bore guide 38 and performs the processing to the opening of the can while rotating around the center axis C.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rotary machining tool and a can manufacturing apparatus.

Background Art

[0002] Conventionally, for example, as shown in Patent Document 1 below, there is known a bottle can manufacturing apparatus (hereinafter sometimes referred to as a can manufacturing apparatus) that manufactures a bottle can (a can with a screw) by performing various processes on the opening of a cylindrical can (DI can).

[0003] The can manufacturing apparatus includes a holding table (turn table), a processing table (die table), a table indexing mechanism, and a crank mechanism. The holding table has a plurality of chucks that hold a plurality of cans. The processing table is disposed to face the holding table from the axial direction of the table. The processing table has a plurality of processing tools for performing processing on each can held by the holding table. The table indexing mechanism intermittently rotates and moves the holding table relative to the processing table around the table axis. The crank mechanism reciprocates the processing table relative to the holding table in the table axis direction.

[0004] The plurality of chucks of the holding table are arranged side by side around the outer periphery of the holding table around the table axis. Each can is held by each chuck in a posture with the opening facing the processing table side. The plurality of processing tools of the processing table are arranged side by side around the outer periphery of the processing table around the table axis. The plurality of processing tools include a plurality of die processing tools and a plurality of rotary processing tools. The plurality of die processing tools perform various die processes such as drawing (necking) and expanding on the opening of the can. The plurality of rotary processing tools perform various rotary processes such as trimming, screw forming, curling, and slotting (crushing the curl) on the opening of the can.

[0005] The holding table and the processing table are repeatedly moved closer to and away from each other in the table axis direction by a crank mechanism, and are intermittently rotated relative to each other around the table axis by a table indexing mechanism. Specifically, the processing table repeatedly moves closer to and away from the holding table in the table axis direction, and during one stroke (reciprocating movement) of this approach and separation, the holding table rotates by a predetermined amount around the table axis with respect to the processing table (intermittent rotation).

[0006] And for each stroke in which the tables approach and separate from each other, a predetermined process is performed on the can by a processing tool, and the can is moved to the processing position by the next processing tool. By repeating this operation, sequential processing is performed on the cans held by the holding table by a plurality of processing tools provided on the processing table, and when the processing by all the processing tools is completed, a bottle can having a predetermined shape is obtained.

[0007] In Patent Document 1, various rotary processing tools include a rotatable mandrel support body inserted into the opening (mouth part) of the can, and a processing means for performing processing on the opening while rotating around the mandrel support body.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In recent years, there are various types of paints used for the inner surface coating of cans, and depending on the type of paint, some are prone to peeling. When using a paint that is prone to peeling, it is necessary to apply a thick film thickness in order to suppress the occurrence of film peeling from the inner surface of the can.

[0010] However, when the inner surface coating film of the can becomes thick, when the mandrel support is inserted into the opening of the can while rotating as in Patent Document 1, the mandrel support and the inner surface coating film of the can rub against each other, and coating film peeling is likely to occur.

[0011] An object of the present invention is to provide a rotary processing tool and a can manufacturing apparatus that can suppress the occurrence of coating film peeling during processing with a rotary processing tool even when the inner surface coating film of the can is thick.

Means for Solving the Problems

[0012] In order to solve the above problems, the present invention provides the following means.

[0013] 〔Aspect 1 of the Present Invention〕 A rotary processing tool for processing the opening of a cylindrical can, comprising a diameter guide inserted into the opening along the axial direction along which the central axis of the rotary processing tool extends, a rotation restricting means for restricting the rotation of the diameter guide around the central axis, and a processing means disposed on the outer side in the radial direction of the diameter guide and performing processing on the opening while rotating around the central axis.

[0014] In the rotary processing tool of the present invention, the diameter guide is inserted axially into the opening of the can in a state where the rotation around the central axis is restricted by the rotation restricting means. Therefore, even when the film thickness of the inner surface coating film of the can is increased, the diameter guide and the inner surface coating film of the can do not relatively rotate around the central axis and rub against each other. Thereby, the occurrence of peeling of the inner surface coating film of the can can be suppressed. Therefore, according to the present invention, even when the inner surface coating film of the can is thick, the occurrence of coating film peeling during processing with the rotary processing tool can be stably suppressed.

[0015] 〔Aspect 2 of the Present Invention〕 The rotary processing tool according to Aspect 1, further comprising a rotary cylinder connected to the processing means, extending in the axial direction, and rotating around the central axis, and a fixed shaft connected to the diameter guide, extending in the axial direction, and inserted into the inside of the rotary cylinder.

[0016] In this case, a fixed shaft connected to the diameter guide and a rotating cylinder connected to the processing means form a double cylinder structure with a common central axis (coaxial). Therefore, the rotary processing tool of the present invention can be realized with a compact and simple structure.

[0017] 〔Aspect 3 of the present invention〕 The rotation restricting means includes a guide wall fixed to a base material to which the rotary processing tool is attached, and a stopper connected to the fixed shaft. The stopper contacts the guide wall while being restricted from rotating around the central axis. The rotary processing tool according to aspect 2.

[0018] In this case, the stopper contacts the guide wall fixed to the base material (processing table) while being restricted from rotating around the central axis. As a result, the diameter guide connected to the stopper via the fixed shaft is also restricted from rotating around the central axis. A structure (rotation restricting means) for restricting the rotation of the diameter guide can be provided at a position away from the diameter guide. Therefore, it is easy to secure a space for providing the rotation restricting means, and the degree of freedom in the design of the apparatus increases. Also, it becomes easy to apply the rotary processing tool of the present invention to an existing can manufacturing apparatus.

[0019] 〔Aspect 4 of the present invention〕 The rotary processing tool according to aspect 3, further comprising an elastically deformable biasing member that biases the diameter guide toward one side in the axial direction, and the stopper has a bumper that contacts the fixed wall fixed to the base material from the other side in the axial direction.

[0020] When the holding table and the processing table of the can manufacturing apparatus approach and move, and when the diameter guide is inserted into the opening of the can and abuts against a part of the opening, further movement of the diameter guide in one axial direction is restricted. From this state, as the tables approach and move closer to each other, while the biasing member elastically deforms, the base material (processing table) and the fixed wall fixed to the base material move in one axial direction with respect to the diameter guide, the fixed shaft, and the stopper. As a result, the bumper of the stopper is separated from the fixed wall.

[0021] Next, when the holding table and the processing table move apart, while the biasing member restores and deforms, the fixed wall collides with the bumper from one axial direction. At this time, since the bumper acts as a buffer material that absorbs and alleviates the impact, damage to the stopper due to the collision with the fixed wall is suppressed, and the function of the rotation restricting means is maintained well over a long period.

[0022] 〔Aspect 5 of the present invention〕 When the diameter guide is inserted into the opening of the can, the processing means moves in one axial direction with respect to the diameter guide and rotates around the central axis, and has a rotating body that rotates around the central axis as the rotating body rotates, and an axial relative movement with the diameter guide is restricted. The forming part has a cam follower that can roll axially on the tapered surface of the cam, and a roller that presses the opening radially inward as the cam follower rolls axially relative to the cam in the other axial direction with respect to the cam. The rotary machining tool according to any one of Aspects 1 to 4.

[0023] In this case, the rotary machining tool is a slot machining tool (curl flattening machining tool) for slot machining (curl flattening machining) a curl portion provided in advance in the opening (base portion) of the can.

[0024] Specifically, when the holding table and the processing table of the can manufacturing apparatus approach each other, first, the diameter guide is inserted into the opening of the can from the axial direction. Next, when the further movement of the diameter guide toward one side in the axial direction is restricted due to contact with the opening end of the can or the like, from this state, the rotating body further moves toward one side in the axial direction.

[0025] Due to the movement of the rotating body toward one side in the axial direction, the cam follower of the forming portion rolls relatively toward the other side in the axial direction on the tapered surface of the cam. As a result, the roller of the forming portion presses the opening of the can inward in the radial direction and rotates around the central axis as the rotating body rotates. In this way, the roller performs slot machining on the curl portion provided at the opening of the can over the entire circumference.

[0026] Thus, when the rotary machining tool of the present invention is applied to a slot machining tool, the above-described operational effects according to the present invention are more stably achieved.

[0027] 〔Aspect 6 of the present invention〕 A can manufacturing apparatus including a holding table that is intermittently rotated around a table axis, and a processing table that reciprocates in the table axis direction with respect to the holding table, the holding table having a plurality of chucks that hold a plurality of cans, the processing table having a plurality of processing tools that perform processing on each of the cans held by each of the chucks, the plurality of processing tools including a plurality of die processing tools and a plurality of rotary processing tools, and at least one of the plurality of rotary processing tools being the rotary processing tool according to any one of Aspects 1 to 5.

Effects of the Invention

[0028] According to the rotary processing tool and the can manufacturing apparatus of the above aspect of the present invention, even when the inner surface coating film of the can is thick, it is possible to suppress the occurrence of coating film peeling during processing by the rotary processing tool.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0030] The can manufacturing apparatus 1 according to an embodiment of the present invention and a slot processing tool 30A as an example of the rotary processing tool 30 will be described with reference to the drawings. As shown in FIGS. 1 and 2, the can manufacturing apparatus 1 of the present embodiment is a so-called bottle necker (bottle can manufacturing apparatus) that manufactures a bottle can (product can) P having a predetermined shape by performing a plurality of types of forming processes including die processing and rotary processing on a cylindrical can (intermediate formed can) W as a workpiece.

[0031] The can W supplied to the can manufacturing apparatus 1 as a workpiece is a DI can that has been subjected to processes such as DI (Drawing & Ironing) processing, printing, and painting in a previous process than the can manufacturing apparatus 1. The DI can is formed into a bottomed cylindrical shape by performing a capping process (drawing process), a DI process (drawing and ironing process), a trimming process, a printing process, a painting process, etc. on a disc-shaped blank punched from an aluminum alloy plate. Further, in the present embodiment, a BPA-NI paint is used for the inner surface coating film of the can W. The BPA-NI paint is known as a paint that does not intentionally contain bisphenol A (BPA). Due to the characteristics of the paint, the BPA-NI paint has lower adhesion to the inner surface of the can than conventional paints. Therefore, in order to suppress the occurrence of peeling of the coating film from the inner surface of the can, the BPA-NI paint is applied with a thicker film thickness than conventional paints.

[0032] The can W includes a cylindrical peripheral wall (can body) and a substantially disc-shaped bottom wall (can bottom). In the present embodiment, the central axis of the can W is referred to as the can axis, and the direction in which the can axis extends is referred to as the can axis direction. In the can manufacturing apparatus 1, necking is performed on the opening of the can W having a bottomed cylindrical shape, whereby the base portion and the shoulder portion are formed. The base portion is the minimum diameter portion of the peripheral wall of the can W. The shoulder portion is disposed between the body portion, which is the maximum diameter portion of the peripheral wall of the can W, and the base portion, and has a tapered shape in which the diameter gradually decreases as it goes from the body portion toward the base portion along the can axis direction.

[0033] In the bottle can P manufactured by processing the can W with the can manufacturing apparatus 1, in a post-process after the can manufacturing apparatus 1, the content such as a beverage is filled, and a cap is screwed onto the base portion, thereby being sealed.

[0034] The can manufacturing apparatus 1 includes an apparatus main body 4, a holding table 3, a processing table 2, a shaft portion 5, a crank mechanism 8, a drive motor 11, a table index mechanism 9, a supply wheel 10, a discharge wheel 14, a wheel index mechanism 15, and a conveying means 12.

[0035] In the processing table 2 and the holding table 3, each table axis TA, which is the central axis of each, extends in the horizontal direction, and these table axes TA are arranged coaxially with each other. The processing table 2 and the holding table 3 are arranged side by side in the direction in which the table axis TA extends and face each other.

[0036] In the present embodiment, the direction in which the table axis TA extends is referred to as the table axis direction. In each figure, the table axis direction corresponds to the X-axis direction. Among the table axis directions, the direction from the processing table 2 toward the holding table 3 (+X side) is referred to as one side of the table axis direction, and the direction from the holding table 3 toward the processing table 2 (-X side) is referred to as the other side of the table axis direction. Note that the table axis direction may be rephrased as the front-rear direction. In this case, one side (+X side) of the table axis direction corresponds to the rear side, and the other side (-X side) of the table axis direction corresponds to the front side.

[0037] Also, the direction orthogonal to the table axis TA is called the table radial direction. Among the table radial directions, the direction approaching the table axis TA is called the inner side of the table radial direction, and the direction away from the table axis TA is called the outer side of the table radial direction. Also, the direction of rotation around the table axis TA is called the table circumferential direction.

[0038] The apparatus main body 4 supports a holding table 3, a processing table 2, a shaft portion 5, a crank mechanism 8, a table index mechanism 9, a drive motor 11, a supply wheel 10, a discharge wheel 14, and a wheel index mechanism 15. The conveying means 12 extends outside the apparatus main body 4.

[0039] Although detailed illustration is omitted, the apparatus main body 4 has, for example, a base, a frame attached to the base, and an exterior member covering the base and the frame. The base is installed on the floor of a facility such as a factory. The frame is assembled on the base and fixed to the base by fastening members such as bolts or welding. The exterior member has a housing shape and includes a plurality of plate-like members. A part of the exterior member is a door portion that can be opened and closed, and is opened and closed during maintenance of the components of the apparatus.

[0040] The holding table 3 is called, for example, a turntable or an index table. The holding table 3 has a circular annular shape. The holding table 3 is, for example, a circular ring-shaped or disk-shaped table with a large diameter (for example, a radius of 650 mm or more).

[0041] On the outer peripheral portion of the surface facing the other side (-X side) in the table axis direction of the holding table 3, a plurality of chucks 7 arranged at equal pitches along the table circumferential direction are provided. That is, the holding table 3 has a plurality of chucks 7 arranged side by side in the table circumferential direction on the outer peripheral portion of the holding table 3. The plurality of chucks 7 hold a plurality of cans W.

[0042] Specifically, the bottom of each can W is held by each chuck 7. The can W held by the chuck 7 has its opening facing the other side (-X side) in the table axis direction and facing the processing table 2. The holding table 3 is intermittently rotated in the circumferential direction of the table by a table indexing mechanism 9. That is, the holding table 3 holds a plurality of cans W and is intermittently rotated around the table axis TA.

[0043] In this embodiment, among the circumferential direction of the table, 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 direction opposite to the holding table rotation direction R1 or the reverse holding table rotation direction.

[0044] Note that the holding table rotation direction R1 is the same direction as the direction in which a plurality of processing tools 6 provided on the processing table 2, which will be described later, are arranged in the circumferential direction of the table in the order of processing the can W. For this reason, the holding table rotation direction R1 can be rephrased as the downstream side (or simply the processing order direction) of the processing order of the can W, and the direction opposite to the holding table rotation direction R1 (reverse holding table rotation direction) can be rephrased as the upstream side of the processing order of the can W.

[0045] The processing table 2 is called, for example, a die table. The processing table 2 has a circular annular shape. The processing table 2 is, for example, a circular ring-shaped or disc-shaped table with a large diameter. The diameter dimension (outer diameter dimension) of the processing table 2 is substantially the same as the diameter dimension of the holding table 3.

[0046] The processing table 2 is supported by the apparatus main body 4 via a shaft portion 5. The shaft portion 5 is fixed to the processing table 2 and extends in the table axis direction around the table axis TA. The shaft portion 5 penetrates the holding table 3 in the table axis direction. The shaft portion 5 is movable in the table axis direction with respect to the holding table 3. The shaft portion 5 is slidably supported by the apparatus main body 4 in the table axis direction, and one end of the shaft portion 5 on the one side (+X side) in the table axis direction is connected to a connecting rod 18 of a crank mechanism 8, which will be described later.

[0047] The processing table 2 is arranged to face the holding table 3 from the other side (-X side) in the table axis direction. The processing table 2 is reciprocated in the table axis direction with respect to the holding table 3 by a crank mechanism 8.

[0048] The processing table 2 has a plurality of processing tools 6 for processing each can W held by each chuck 7. The plurality of processing tools 6 are arranged side by side in the table circumferential direction on the outer peripheral portion of the processing table 2. Specifically, the plurality of processing tools 6 are arranged at equal pitches along the table circumferential direction on the outer peripheral portion of the processing table 2, and are respectively arranged to face a plurality of cans W held by the holding table 3 from the other side in the table axis direction. The plurality of processing tools 6 are different in type from each other.

[0049] As shown in FIG. 1, the central axis (tool central axis) C of each processing tool 6 extends parallel to the table axis TA. In the present embodiment, the direction in which the central axis C of the processing tool 6 extends is referred to as the axial direction. The axial direction is the same direction as the table axis direction and corresponds to the X-axis direction in each figure. In the present embodiment, one side in the axial direction corresponds to one side (+X side) in the table axis direction, and the other side in the axial direction corresponds to the other side (-X side) in the table axis direction. Note that the axial direction may be referred to as the front-rear direction. In this case, one side (+X side) in the axial direction corresponds to the rear side, and the other side (-X side) in the axial direction corresponds to the front side.

[0050] Also, the direction orthogonal to the central axis C is referred to as the radial direction. Among the radial directions, the direction approaching the central axis C is referred to as the inner radial direction, and the direction away from the central axis C is referred to as the outer radial direction. Also, the direction of orbiting around the central axis C is referred to as the circumferential direction.

[0051] Note that the axial direction may be rephrased as the tool axis direction for the purpose of distinguishing it from the table axis direction. The radial direction may be rephrased as the tool radial direction for the purpose of distinguishing it from the table radial direction. The circumferential direction may be rephrased as the tool circumferential direction for the purpose of distinguishing it from the table circumferential direction.

[0052] The central axis C of the machining tool 6, the central axis of the chuck 7 facing the machining tool 6, and the can axis of the can W held by this chuck 7 are arranged coaxially with each other during machining of the can W. Each machining tool 6 faces each can W from the other axial side (the other side in the tool axis direction, that is, the -X side). Then, with the central axis of the chuck 7 and the can axis of the can W coinciding with the central axis C of the machining tool 6, machining is performed on the can W by the machining tool 6.

[0053] As shown in FIG. 3, the machining table 2 has mounting holes 2a that penetrate the machining table 2 in the table axis direction (X-axis direction). A plurality of mounting holes 2a are provided in the machining table 2. The plurality of mounting holes 2a are arranged side by side in the circumferential direction of the table on the outer peripheral portion of the machining table 2. A plurality (a plurality of types) of machining tools 6 are mounted in each mounting hole 2a in the order of machining the can W along the holding table rotation direction R1.

[0054] The plurality of machining tools 6 include a plurality of die machining tools and a plurality of rotary machining tools 30. In the present embodiment, the die machining tools and the rotary machining tools 30 are detachably mounted in the plurality of mounting holes 2a of the machining table 2 in the order of machining the can W. Note that an oiling tool for attaching oil to the machining planned portion of the can W may be detachably mounted in one or more of the plurality of mounting holes 2a.

[0055] The plurality of die machining tools move axially (in the can axis direction) with respect to the can W and perform various die machining such as drawing (diameter reduction machining) and diameter expansion machining on the opening of the can W. One type (predetermined) of die machining is performed on the can W by one die machining tool.

[0056] The plurality of rotary machining tools 30 perform various rotary machining such as trimming, thread forming, curling, and slot (curling flattening) machining on the opening of the can W by a rotary motion that moves circumferentially (around the can axis) with respect to the can W. One type (predetermined) of rotary machining is performed on the can W by one rotary machining tool 30.

[0057] FIG. 3 shows a slot machining tool 30A as an example of the rotary machining tool 30 of the present embodiment. That is, at least one of the plurality (a plurality of types) of rotary machining tools 30 is the slot machining tool 30A of the present embodiment. The detailed configuration of the slot machining tool 30A (rotary machining tool 30) will be described separately later.

[0058] As shown in FIG. 1, the crank mechanism 8 reciprocates the machining table 2 in the table axis direction with respect to the holding table 3. The crank mechanism 8 includes a drive shaft 16 to which rotation (rotary driving force) from the drive motor 11 is input, a crank shaft 17 that is connected to the drive shaft 16 and is rotated about the axis O of the drive shaft 16 as the drive shaft 16 rotates, and a connecting rod 18 that connects the crank shaft 17 and the shaft portion 5. The crank mechanism 8 converts the rotational motion about the axis O input from the drive motor 11 to the drive shaft 16 into a linear motion in the table axis direction and outputs it to the shaft portion 5. The drive motor 11 is, for example, an inverter motor or the like.

[0059] The table index mechanism 9 rotates and stops (intermittently rotates) the holding table 3 in the table circumferential direction for each stroke of the reciprocating movement along the table axis direction of the machining table 2. The table index mechanism 9 has a structure that intermittently rotates the holding table 3 about the table axis TA with respect to the machining table 2 according to the crank angle around the drive shaft 16 of the crank mechanism 8.

[0060] Therefore, the holding table 3 and the machining table 2 are repeatedly moved closer to and away from each other in the table axis direction by the crank mechanism 8, and are intermittently rotated relative to each other in the table circumferential direction by the table index mechanism 9. Specifically, the machining table 2 moves closer to and away from the holding table 3 in the table axis direction, and during one stroke (reciprocating movement) of this approach and separation, the holding table 3 rotates (intermittently rotates) by a predetermined amount in the table circumferential direction with respect to the machining table 2.

[0061] Then, for each stroke in which the processing table 2 and the holding table 3 approach and separate from each other, a predetermined process is performed on the can W held by the chuck 7 of the holding table 3 by each processing tool 6 of the processing table 2, and the holding table 3 moves the can W downstream (in the holding table rotation direction R1) in the processing order to the processing position by the next (different) processing tool 6. By repeating this operation, the can W held by the holding table 3 is sequentially processed by a plurality of processing tools 6 provided on the processing table 2, and when the processing by all the processing tools 6 is completed, a bottle can P having a predetermined shape is obtained.

[0062] As shown in FIG. 2, the supply wheel 10 supplies the can W to the holding table 3. The supply wheel 10 is called an infeed wheel and has a substantially cylindrical shape. The supply wheel 10 receives the can W supplied from the outside of the can manufacturing apparatus 1 (the previous process than the can manufacturing apparatus 1) to the shooter 13 and delivers the can W to the holding table 3. The supply wheel 10 has a wheel axis SA, which is its central axis, extending parallel to the table axis TA and is supported by the apparatus main body 4. The supply wheel 10 is rotated in the wheel rotation direction R2 about the wheel axis SA.

[0063] The discharge wheel 14 discharges the processed can W (bottle can P) from the holding table 3. The discharge wheel 14 is called a discharge wheel and has a substantially cylindrical shape. The discharge wheel 14 receives the can W (bottle can P) processed by the can manufacturing apparatus 1 from the holding table 3 and delivers it (discharges it) to the conveying means 12. The conveying means 12 conveys the bottle can P toward the outside of the can manufacturing apparatus 1 (the subsequent process than the can manufacturing apparatus 1). The discharge wheel 14 has a wheel axis DA, which is its central axis, extending parallel to the table axis TA and is supported by the apparatus main body 4. The discharge wheel 14 is rotated in the wheel rotation direction R3 about the wheel axis DA.

[0064] The supply wheel 10 has a plurality of concave pockets 23 capable of holding the peripheral wall of the can W. The plurality of pockets 23 are arranged on the outer peripheral portion of the supply wheel 10 at equal pitches in the circumferential direction of the wheel around the wheel axis SA. Further, the discharge wheel 14 has a plurality of concave pockets 24 capable of holding the peripheral wall of the can W (bottle can P). The plurality of pockets 24 are arranged on the outer peripheral portion of the discharge wheel 14 at equal pitches in the circumferential direction of the wheel around the wheel axis DA. In FIG. 2, the illustration of each pocket 23, 24 is partially omitted.

[0065] These pockets 23, 24 are formed in a concave curved surface shape in which a cross section perpendicular to the wheel axes SA, DA is a concave arc shape corresponding to the fact that the peripheral wall of the can W is cylindrical. Further, suction holes communicating with an air suction source (not shown) are opened on the inner surfaces of the pockets 23, 24. The pockets 23, 24 can hold the can W by the air suction force of the air suction source acting on the peripheral wall of the can W through the suction holes.

[0066] The wheel indexing mechanism 15 intermittently rotates and moves the supply wheel 10 and the discharge wheel 14 around the respective wheel axes SA, DA in synchronization with the intermittent rotation of the holding table 3 around the table axis TA.

[0067] Specifically, the supply wheel 10 and the discharge wheel 14 are intermittently rotated by the wheel indexing mechanism 15 in wheel rotation directions R2, R3 (clockwise around the respective wheel axes SA, DA in the example of FIG. 2) that are reverse to the holding table rotation direction R1 (counterclockwise around the table axis TA in the example of FIG. 2).

[0068] When the supply wheel 10 rotates intermittently and the can W held in the pocket 23 of the supply wheel 10 is arranged at a position overlapping with the chuck 7 of the holding table 3 when viewed from the table axis direction (directly above the chuck 7), a pushing portion (not shown) provided on the processing table 2 pushes this can W toward one side (+X side) in the table axis direction. Thereby, the can W is transferred from the pocket 23 to the chuck 7 and held by the chuck 7.

[0069] Also, the can W held by the chuck 7 of the holding table 3 is transferred in the holding table rotation direction R1 for each stroke of the processing table 2, and after all the processing is completed, when it is arranged at a position overlapping with the pocket 24 of the discharge wheel 14 (directly below the pocket 24) as viewed from the table axis direction, the extrusion piston provided in the chuck 7 pushes out this can W (the bottle can P of the product subjected to all the processing) toward the other side (-X side) in the table axis direction. As a result, the can W (bottle can P) is transferred from the chuck 7 to the pocket 24 and held by the pocket 24.

[0070] The bottle can P held by the pocket 24 is transferred around the wheel axis DA as the discharge wheel 14 rotates intermittently, is released from the pocket 24, and is transferred to the conveying means 12.

[0071] The drive motor 11, the crank mechanism 8, the table index mechanism 9, and the wheel index mechanism 15 are mechanically connected to each other so as to be synchronizable, for example, by gears, belts, joints, etc. That is, by the rotational driving force of the drive motor 11, the crank mechanism 8, the table index mechanism 9, and the wheel index mechanism 15 are driven in synchronization with each other.

[0072] Next, with reference to FIG. 3, the slot processing tool 30A (rotary processing tool 30) of the present embodiment will be described. The slot processing tool 30A is a rotary processing tool 30 that performs slot processing (curl crushing processing) on the opening (base portion) of the can W. Specifically, for example, as shown in FIGS. 8, 9, and 10(e), (f) of the above Patent Document 1 (Japanese Patent No. 3889292), the slot processing tool 30A presses and caulks the curl portion pre-formed on the base portion of the can W from the radially outer side over the entire circumference around the can axis to form a curl caulking portion.

[0073] As shown in FIG. 3, the slot machining tool 30A includes a bracket 31, a housing 32, a buffer mechanism 33, an arm 34a that forms part of the position restricting means 34, a rotating cylinder 35, a sprocket 36, a fixed shaft 37, a diameter guide 38, a machining means 39, a biasing member 40, a rotation restricting means 41, and a support arm 42.

[0074] The bracket 31 has a cylindrical shape extending in the axial direction and is fixed to the machining table 2 while being inserted into the mounting hole 2a of the machining table 2.

[0075] The housing 32 has a cylindrical shape extending in the axial direction and is inserted into the bracket 31. The housing 32 is movable in the axial direction with respect to the bracket 31. Further, the rotation of the housing 32 around the central axis C with respect to the bracket 31 is restricted.

[0076] The buffer mechanism 33 is a compression coil spring or the like that can be elastically deformed in the axial direction. The buffer mechanism 33 biases the housing 32 toward one axial side (+X side) with respect to the bracket 31.

[0077] The arm 34a is one of the plurality of components included in the position restricting means 34. The arm 34a is fixed to the housing 32 and protrudes radially outward from the housing 32.

[0078] The position restricting means 34 has a function of restricting the axial position (position along the table axis direction) of the housing 32 to a fixed position when the machining table 2 is closest to the holding table 3 in the table axis direction. In other words, during the machining of the opening of the can W, the distance along the axial direction (distance along the table axis direction) between the can W held by the chuck 7 and the housing 32 is maintained constant by the position restricting means 34.

[0079] The functions (operations) of the bracket 31, the housing 32, the buffer mechanism 33, and the position regulating means 34 (arm 34a) are the same as those described in the above Patent Document 1 (Japanese Patent No. 3889292), and detailed description thereof is omitted here.

[0080] The rotating cylinder 35 is cylindrical with the central axis C as the center and extends in the axial direction. The rotating cylinder 35 is inserted into the housing 32. The rotating cylinder 35 is rotatable about the central axis C. Specifically, the rotating cylinder 35 is rotatably supported by the housing 32 via a plurality of bearings 43. Further, the rotating cylinder 35 projects from both sides in the axial direction (one axial side and the other axial side) of the housing 32.

[0081] The sprocket 36 has an annular shape with the central axis C as the center and is fixed to a portion of the rotating cylinder 35 that projects to the other axial side (-X side) of the housing 32. Although not particularly shown, the sprocket 36 is connected to a rotary machining motor attached to the machining table 2 via a transmission member such as a belt. Due to the rotation of the rotary machining motor, the sprocket 36 rotates about the central axis C, and accordingly, the rotating cylinder 35 also rotates about the central axis C.

[0082] The fixed shaft 37 is shaft-shaped with the central axis C as the center and extends in the axial direction. The fixed shaft 37 is inserted into the rotating cylinder 35. In the present embodiment, the fixed shaft 37 is configured by integrally fixing (connecting) a plurality of shaft segments arranged in the axial direction by screwing or the like. The fixed shaft 37 projects from both sides in the axial direction (one axial side and the other axial side) of the rotating cylinder 35.

[0083] The diameter guide 38 is cylindrical or columnar with the central axis C as the center and extends in the axial direction. The diameter guide 38 is fixed to the end on one axial side (+X side) of the fixed shaft 37 by screwing or the like. That is, the fixed shaft 37 is connected to the diameter guide 38. When the processing table 2 moves close to the holding table 3, the end on one axial side of the diameter guide 38 is inserted into the opening of the can W along the axial direction in which the central axis C of the slot processing tool 30A (rotary processing tool 30) extends.

[0084] Further, the diameter guide 38 has a step portion 38a disposed on the outer peripheral surface of the diameter guide 38. The step portion 38a is a step provided on the outer peripheral surface of the diameter guide 38 and facing one axial side, and forms a circular ring with the central axis C as the center. When the end on one axial side of the diameter guide 38 is inserted into the opening of the can W, the opening end of the can W (the upper end of the curled portion not shown) contacts the step portion 38a from one axial side. Due to this contact, the diameter guide 38 is restricted from moving further to one axial side with respect to the can W.

[0085] The processing means 39 is disposed outside the diameter guide 38 in the radial direction and performs processing on the opening of the can W while rotating around the central axis C. In this embodiment, the processing means 39 performs slot processing that presses the curled portion provided in advance in the opening of the can W radially inward over the entire circumference while rotating around the central axis C.

[0086] The processing means 39 includes a rotating body 44 that moves to one axial side with respect to the diameter guide 38 and rotates around the central axis C when the diameter guide 38 is inserted into the opening of the can W, and a forming portion 45 that is restricted from moving axially relative to the diameter guide 38 and rotates around the central axis C as the rotating body 44 rotates.

[0087] The rotating body 44 has a cylindrical shape centered on the central axis C and extends in the axial direction. The rotating body 44 is fixed to one end of the rotating cylinder 35 in the axial direction by a fastening member such as a bolt. That is, the rotating cylinder 35 is connected to the rotating body 44 (processing means 39). When the rotating cylinder 35 is rotated by a rotary processing motor, the rotating body 44 also rotates around the central axis C accordingly.

[0088] The rotating body 44 has a concave portion 44a that recesses from one end face of the rotating body 44 in the axial direction to the other side in the axial direction, and a cam 44b having a tapered surface shape that is arranged on the outer peripheral surface of the rotating body 44 and whose diameter decreases as it goes toward one side in the axial direction.

[0089] The concave portion 44a has a hole shape centered on the central axis C and opens to one side in the axial direction. An urging member 40 is arranged in the concave portion 44a. The urging member 40 is an elastically deformable compression coil spring or the like. The urging member 40 has a spiral shape centered on the central axis C.

[0090] The forming portion 45 has a support cylinder 45a whose relative movement in the axial direction with respect to the diameter guide 38 is restricted and whose relative rotation around the central axis C is allowed, a swing arm 45c that is swingably supported by the support cylinder 45a via a rotation shaft 45b, a cam follower 45d that is arranged at the other end of the swing arm 45c in the axial direction, and a roller 45e that is arranged at one end of the swing arm 45c in the axial direction.

[0091] The support cylinder 45a has a cylindrical shape centered on the central axis C and extends in the axial direction. The other end of the support cylinder 45a in the axial direction is inserted into the concave portion 44a. The support cylinder 45a is urged toward one side in the axial direction by the urging member 40. For this reason, the urging member 40 urges the diameter guide 38 toward one side in the axial direction via the support cylinder 45a.

[0092] Further, the support cylinder 45a is engaged with the inner peripheral portion of the concave portion 44a by, for example, a spline structure or the like. As a result, the relative rotation of the support cylinder 45a around the central axis C with respect to the rotating body 44 is restricted, and the relative movement in the axial direction is permitted. Therefore, when the rotating body 44 is rotated, the support cylinder 45a also rotates around the central axis C accordingly.

[0093] A plurality of sets of the rotating shaft 45b, the swing arm 45c, the cam follower 45d, and the roller 45e are provided in the molding portion 45. In the present embodiment, two sets of the above-described sets are provided in the molding portion 45. Each of the above-described sets in the molding portion 45 is arranged at intervals in the circumferential direction, and in the present embodiment, they are arranged at equal pitches in the circumferential direction.

[0094] The rotating shaft 45b is provided on a protrusion 45f that protrudes radially outward from one end portion of the support cylinder 45a in the axial direction. The swing arm 45c is plate-shaped or columnar and extends in the axial direction. The swing arm 45c is swingable around the rotating shaft 45b and is supported by the protrusion 45f via the rotating shaft 45b.

[0095] The cam follower 45d is rotatably supported at the other end portion of the swing arm 45c in the axial direction. The cam follower 45d contacts the tapered surface of the cam 44b of the rotating body 44. The cam follower 45d is rollable in the axial direction on the tapered surface of the cam 44b.

[0096] The roller 45e is rotatably supported at one end portion of the swing arm 45c in the axial direction. The central axis (rotation axis) of the roller 45e extends substantially in the axial direction. The outer peripheral surface (molding surface) of the roller 45e is arranged to face the outer peripheral surface of the diameter guide 38 from the radially outside in the vicinity of the step portion 38a.

[0097] The processing table 2 moves closer to the holding table 3, the diameter guide 38 is inserted into the opening of the can W, and when the open end of the can W (the upper end of the curled portion) contacts the stepped portion 38a and the diameter guide 38 is restricted from moving further axially in one direction with respect to the can W, the biasing member 40 contracts due to elastic deformation, and the rotating body 44 moves further axially in one direction with respect to the diameter guide 38 and the forming portion 45.

[0098] At this time, the cam 44b moves axially in one direction with respect to the cam follower 45d, and as the cam follower 45d rolls on the cam 44b, the radial position of the cam follower 45d is displaced radially outward. As a result, the swing arm 45c swings around the rotation shaft 45b, and the radial position of the roller 45e is displaced radially inward. That is, as the cam follower 45d rolls axially in the other direction relative to the cam 44b, the roller 45e is moved radially inward. Thereby, the roller 45e presses the opening (curled portion) of the can W radially inward.

[0099] Also at this time, the rotary cylinder 35 is rotated via the sprocket 36 by the rotary processing motor, and accordingly, the rotating body 44 and the forming portion 45 are also rotated around the central axis C. The roller 45e in contact with the opening (curled portion) of the can W rotates (revolves) around the central axis C while rotating (rotating on its own axis) around its rotation axis, so that the roller 45e presses the opening (curled portion) of the can W over the entire circumference and performs slot processing.

[0100] Also, when the processing table 2 moves away from the holding table 3, due to the operation opposite to the above description, the roller 45e returns to its original position, and the diameter guide 38 is withdrawn axially in the other direction from the opening of the can W.

[0101] The rotation restricting means 41 restricts the rotation of the diameter guide 38 around the central axis C. The rotation restricting means 41 includes a guide wall 46 fixed to the base material (processing table 2) to which the slot processing tool 30A (rotary processing tool 30) is attached, and a stopper 47 connected to the fixed shaft 37.

[0102] The guide wall 46 is fixed to the processing table 2 via a substantially L-shaped support arm 42. The guide wall 46 is plate-shaped. A pair of plate surfaces of the guide wall 46 face in the radial direction orthogonal to the central axis C. In the present embodiment, a pair of guide walls 46 are provided so as to be parallel to each other with the central axis C interposed therebetween.

[0103] The stopper 47 is fixed to the end portion on the other axial side of the fixed shaft 37 by screwing or the like. The stopper 47 has a polygonal plate shape such as a quadrangular plate shape, for example. A pair of plate surfaces of the stopper 47 face in the axial direction. The stopper 47 is in contact with the guide wall 46 in a state where rotation about the central axis C is restricted. Further, the stopper 47 is movable in the axial direction with respect to the guide wall 46. Specifically, the stopper 47 slides along the axial direction with the guide wall 46. In the present embodiment, the stopper 47 is arranged so as to be sandwiched between the pair of guide walls 46.

[0104] The support arm 42 has a plate-shaped fixed wall 42a. The fixed wall 42a is arranged adjacent to the stopper 47 on one axial side of the stopper 47. Since the support arm 42 is fixed to the base material (processing table 2), the fixed wall 42a is also fixed to the base material. The fixed wall 42a has a through hole 42b that penetrates the fixed wall 42a in the axial direction. A portion of the fixed shaft 37 that protrudes axially from the rotating cylinder 35 is inserted into the through hole 42b.

[0105] The stopper 47 has a bumper 47a that contacts the fixed wall 42a from the other axial side. The bumper 47a is made of, for example, PEEK (polyetheretherketone), and has a plate shape in the present embodiment. A pair of plate surfaces of the bumper 47a face in the axial direction. The bumper 47a has a function of absorbing and mitigating impacts caused by collisions or the like.

[0106] The biasing force directed toward one axial side of the biasing member 40 acts on the stopper 47 via the support cylinder 45a, the diameter guide 38, and the fixed shaft 37. As a result, the plate surface of the bumper 47a facing one axial side is in contact with the plate surface of the fixed wall 42a facing the other axial side in the axial direction.

[0107] When the machining table 2 moves closer to the holding table 3 and the rotating body 44 moves toward one axial side with respect to the diameter guide 38 and the fixed shaft 37 while elastically deforming the biasing member 40 against the biasing force of the biasing member 40, the fixed wall 42a is separated from the bumper 47a toward one axial side. Further, when the machining table 2 moves away from the holding table 3, the fixed wall 42a contacts (collides) with the bumper 47a from one axial side.

[0108] In the rotary machining tool 30 of the present embodiment described above and the can manufacturing apparatus 1 including the same, the diameter guide 38 is inserted axially into the opening of the can W in a state where rotation about the central axis C is restricted by the rotation restricting means 41. Therefore, even when the film thickness of the inner surface coating film of the can W is increased, the diameter guide 38 and the inner surface coating film of the can W do not relatively rotate and rub against each other about the central axis C. Thereby, the occurrence of peeling of the inner surface coating film of the can W can be suppressed. Therefore, according to the present embodiment, even when the inner surface coating film of the can W is thick, it is possible to stably suppress the occurrence of coating film peeling during machining by the rotary machining tool 30.

[0109] The rotary machining tool 30 of the present embodiment also includes a rotating cylinder 35 that is connected to the machining means 39, extends in the axial direction, and rotates about the central axis C, and a fixed shaft 37 that is connected to the diameter guide 38, extends in the axial direction, and is inserted into the rotating cylinder 35. That is, the fixed shaft 37 connected to the diameter guide 38 and the rotating cylinder 35 connected to the machining means 39 form a double cylinder structure having the central axis C as a common axis (coaxial). Therefore, the rotary machining tool 30 of the present embodiment can be realized with a compact and simple structure.

[0110] In the present embodiment, the rotation restricting means 41 includes a guide wall 46 fixed to a base material (processing table 2) to which the rotary processing tool 30 is attached, and a stopper 47 connected to the fixed shaft 37. The stopper 47 is in contact with the guide wall 46 in a state where rotation about the central axis C is restricted. Since the stopper 47 is in contact with the guide wall 46 fixed to the base material (processing table 2) in a state where rotation about the central axis C is restricted, the diameter guide 38 connected to the stopper 47 via the fixed shaft 37 is also restricted in rotation about the central axis C. The structure (rotation restricting means 41) for restricting the rotation of the diameter guide 38 can be provided at a position away from the diameter guide 38 (in the present embodiment, a position greatly spaced apart from the diameter guide 38 on the other axial side). Therefore, it is easy to secure a space for providing the rotation restricting means 41, and the degree of freedom in the design of the apparatus increases. In addition, it becomes easy to apply the rotary processing tool 30 of the present embodiment to an existing can manufacturing apparatus.

[0111] The rotary processing tool 30 of the present embodiment further includes an elastically deformable biasing member 40 that biases the diameter guide 38 toward one axial side. The stopper 47 has a bumper 47a that contacts the fixed wall 42a fixed to the base material (processing table 2) from the other axial side.

[0112] When the holding table 3 and the processing table 2 of the can manufacturing apparatus 1 move closer to each other and the diameter guide 38 is inserted into the opening of the can W and abutted against a part of the opening, further movement of the diameter guide 38 toward one axial side is restricted. From this state, as the tables 2 and 3 move closer to each other, the biasing member 40 elastically deforms, and the base material (processing table 2) and the fixed wall 42a fixed to the base material move toward one axial side with respect to the diameter guide 38, the fixed shaft 37, and the stopper 47. As a result, the bumper 47a of the stopper 47 is separated from the fixed wall 42a.

[0113] Next, when the holding table 3 and the processing table 2 move apart from each other, while the biasing member 40 is restored and deformed, the fixed wall 42a collides with the bumper 47a from one axial side. At this time, since the bumper 47a acts as a cushioning material that absorbs and alleviates the impact, damage to the stopper 47 due to the collision with the fixed wall 42a is suppressed, and the function of the rotation restricting means 41 is maintained well over a long period of time.

[0114] Also, in the present embodiment, when the diameter guide 38 is inserted into the opening of the can W, the processing means 39 includes a rotating body 44 that moves axially in one direction with respect to the diameter guide 38 and rotates around the central axis C, and a forming portion 45 whose axial relative movement with the diameter guide 38 is restricted and that rotates around the central axis C as the rotating body 44 rotates. Further, the rotating body 44 has a tapered surface-shaped cam 44b whose diameter decreases as it goes axially in one direction, and the forming portion 45 has a cam follower 45d that can roll axially on the tapered surface of the cam 44b, and a roller 45e that presses the opening of the can W radially inward as the cam follower 45d relatively rolls axially in the other direction with respect to the cam 44b.

[0115] In this case, the rotary machining tool 30 is a slot machining tool 30A that performs slot machining (curl flattening machining) on a curl portion provided in advance at the opening (base portion) of the can W.

[0116] Specifically, when the holding table 3 and the processing table 2 of the can manufacturing apparatus 1 move closer to each other, first, the diameter guide 38 is inserted axially into the opening of the can W. Next, when the further movement of the diameter guide 38 axially in one direction is restricted due to contact with the open end of the can W or the like, from this state, the rotating body 44 further moves axially in one direction.

[0117] By moving the rotating body 44 axially on one side, the cam follower 45d of the forming part 45 rolls relatively axially toward the other side on the tapered surface of the cam 44b. As a result, the roller 45e of the forming part 45 presses the opening of the can W radially inward and rotates around the central axis C as the rotating body 44 rotates. In this way, the roller 45e slots the curl portion provided at the opening of the can W over the entire circumference.

[0118] Thus, when the rotary machining tool 30 of the present invention is applied to the slot machining tool 30A, the operational effects according to the above-described embodiment are more stably achieved.

[0119] Note that the present invention is not limited to the foregoing embodiment. For example, as described below, configuration changes and the like are possible without departing from the spirit of the present invention.

[0120] In the foregoing embodiment, an example was given in which the stopper 47 has a polygonal plate shape such as a rectangular plate shape, but the present invention is not limited to this. The stopper 47 only needs to be in contact with the guide wall 46 in a state where rotation around the central axis C is restricted, and may have a shape other than a polygonal plate shape.

[0121] Further, the rotary machining tool 30 to which the present invention is applied is not limited to the slot machining tool 30A. The present invention can be applied to various rotary machining tools 30 such as a trimming tool, a thread forming tool, and a curling tool.

[0122] In the foregoing embodiment, as the can manufacturing apparatus 1, a bottle can manufacturing apparatus that manufactures a bottle can P by performing various processes on a bottomed cylindrical can W was given as an example, but the present invention is not limited to this. The can manufacturing apparatus 1 may be, for example, an aerosol can manufacturing apparatus that manufactures an aerosol can by performing various processes on the can W, or a can manufacturing apparatus that manufactures other cans other than bottle cans and aerosol cans. Further, the can W is not limited to a bottomed cylindrical shape, and may be a simple cylindrical shape having a peripheral wall and no bottom wall.

[0123] The present invention may combine each configuration described in the above-described embodiments, modifications, and the like within a range not departing from the gist of the present invention. Also, addition, omission, substitution, and other changes to the configuration are possible. Further, the present invention is not limited by the above-described embodiments and the like, but is limited only by the claims.

Industrial Applicability

[0124] According to the rotary processing tool and the can manufacturing apparatus of the present invention, even when the inner surface coating film of the can is thick, it is possible to suppress the occurrence of coating film peeling during processing by the rotary processing tool. Therefore, it has industrial applicability.

Explanation of Reference Numerals

[0125] 1... Can manufacturing apparatus, 2... Processing table, 3... Holding table, 6... Processing tool, 7... Chuck, 30... Rotary processing tool, 30A... Slot processing tool, 35... Rotary cylinder, 37... Fixed shaft, 38... Diameter guide, 39... Processing means, 40... Biasing member, 41... Rotation restricting means, 42a... Fixed wall, 44... Rotating body, 44b... Cam, 45... Forming portion, 45d... Cam follower, 45e... Roller, 46... Guide wall, 47... Stopper, 47a... Bumper, C... Central axis, TA... Table axis, W... Can

Claims

1. A rotary machining tool for machining an opening of a cylindrical can, comprising: a diameter guide inserted into the opening along an axial direction in which a central axis of the rotary machining tool extends; a rotation restricting means for restricting rotation of the diameter guide about the central axis; a machining means disposed radially outside the diameter guide and performing machining on the opening while rotating about the central axis. The rotary machining tool.

2. a rotary cylinder connected to the machining means, extending in the axial direction, and rotating about the central axis; a fixed shaft connected to the diameter guide, extending in the axial direction, and inserted into the rotary cylinder. The rotary machining tool according to claim 1.

3. The rotation restricting means includes: a guide wall fixed to a base material to which the rotary machining tool is attached; a stopper connected to the fixed shaft, wherein the stopper contacts the guide wall in a state where rotation about the central axis is restricted. The rotary machining tool according to claim 2.

4. an elastically deformable biasing member for biasing the diameter guide toward one side in the axial direction, wherein the stopper has a bumper that contacts a fixed wall fixed to the base material from the other side in the axial direction. The rotary machining tool according to claim 3.

5. The machining means includes: a rotating body that moves toward one side in the axial direction with respect to the diameter guide and rotates about the central axis when the diameter guide is inserted into the opening of the can; a forming portion whose relative axial movement with respect to the diameter guide is restricted and that rotates about the central axis as the rotating body rotates, wherein the rotating body has a tapered surface-shaped cam that decreases in diameter toward one side in the axial direction, and the forming portion includes: a cam follower that can roll axially on the tapered surface of the cam; a roller that presses the opening radially inward as the cam follower rolls axially relative to the cam toward the other side in the axial direction. The rotary machining tool according to any one of claims 1 to 4.

6. a holding table that is intermittently rotated about a table axis; a machining table that reciprocates in the table axis direction with respect to the holding table, wherein the holding table has a plurality of chucks for holding a plurality of cans, the machining table has a plurality of machining tools for machining each of the cans held by each of the chucks, and the plurality of machining tools include a plurality of die machining tools and a plurality of rotary machining tools. At least one of the plurality of rotary machining tools is the rotary machining tool according to any one of claims 1 to 4, Can manufacturing apparatus.

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