WO2018061259A1

WO2018061259A1 - Can forming device

Info

Publication number: WO2018061259A1
Application number: PCT/JP2017/011791
Authority: WO
Inventors: 昭二松尾; 徹也大瀬
Original assignee: ユニバーサル製缶株式会社
Priority date: 2016-09-30
Filing date: 2017-03-23
Publication date: 2018-04-05
Also published as: JP6906412B2; JP2018058115A

Abstract

The present invention relates to a can forming device (20) having: a main frame (21); a turntable (23) rotatably supported on the main frame (21); a main shaft (36) passing through the turntable (23) along a table axis (TA); a die table (22) supported by the main frame (21) via the main shaft (36); a reciprocating device (25) which reciprocates the die table (22) along the table axis (TA); and a rotating device (29) that intermittently rotates the turntable (23) around the table axis (TA). The can forming device (20) is provided with a rotation prevention device (46) for the main shaft (36), the rotation prevention device (46) including: a sub shaft (41) which is spaced apart from the outer peripheral surface of the main shaft (36), extends parallel to the table axis (TA), and has both end portions fixed to the main frame (21); a connection member (42) having one end portion fixed to the main shaft (36) and the other end portion extending toward the sub shaft (41); and an engagement device (43) provided on the other end portion of the connection member (42) and configured to slidably engage the connection member (42) with the sub shaft (41) along the central axis of the sub shaft (41), wherein the engagement device (43) is a fluid bearing which supports the sub shaft (41) by means of a fluid.

Description

Can molding equipment

The present invention relates to prevention of rotation of a die table in a can forming apparatus. This application claims priority based on Japanese Patent Application No. 2016-193317 for which it applied to Japan on September 30, 2016, and uses the content here.

As a can that is filled with beverages and other contents and sealed, a bottomed cylindrical can having a can body (wall) and a bottom (bottom), and a screw cap is screwed onto the open end of the can Bottled cans are known. The can body of such a bottle can is squeezed obliquely so that the upper part is constricted, and a screw groove for screwing a screw cap is provided on the opening side.

When manufacturing such a bottle can, for example, the side wall of a metal plate made of aluminum or an aluminum alloy (drawing) into a cup shape (can base material) is re-used using a can molding device. Stretching and drawing 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. Then, a bottle can is manufactured through the necking process which performs the drawing process of the opening end side of a can body.

In the manufacture of such bottle cans, the bottle necker, which is a can molding device used in the necking process, intermittently has a turntable in which a large number of can body holding parts supporting the bottom side of the can body are arranged in an annular shape. Rotate. Then, a number of necking dies arranged in an annular shape on the die table so as to face a large number of can body holding portions are sequentially pressed against the opening end side of the can body held by the can body holding portion, Thus, drawing is performed (see, for example, Patent Document 1).

In such a bottle necker, the main shaft that supports the die table that reciprocates passes through the center of the turntable that rotates intermittently. The rotational force of one main motor is branched into two systems, one power system is used for turning the turntable, and the other power system is used for reciprocating movement of the main shaft that supports the die table.

Because of the bottle necker structure, the main shaft that passes through the rotating turntable is subject to stress that rotates around the central axis. When the main shaft rotates around the central axis, the die table that performs only reciprocating motion may rotate in the circumferential direction, which may cause defective molding of the can body.

For this reason, for example, in the bottle can manufacturing apparatus disclosed in Patent Document 2, the shaft (main shaft) is fixed to the slide mechanism, the rotation of the shaft is suppressed, and only the reciprocation of the shaft is allowed. Such a slide mechanism is formed at the end of the tool support board, and is slidably engaged with the guide rail. The tool support board is fixed to the shaft, the guide rail is arranged parallel to the central axis of the shaft. Bearing. Thereby, the rotation around the central axis of the shaft can be suppressed while allowing the shaft to reciprocate along the central axis of the shaft.

Japanese Unexamined Patent Publication No. 2008-126266 Japanese Unexamined Patent Publication No. 2007-083252 Japanese Laid-Open Patent Publication No. 2014-091158 US Patent Application Publication No. 2011/0214473

However, in the bottle can manufacturing apparatus (bottle necker) shown in Patent Document 2, it is difficult to increase the molding speed. That is, in order to form a large number of cans in a shorter time using a bottle necker, it is necessary to increase the number of reciprocations per unit time of the die table. On the other hand, in the bottle necker shown in Patent Document 2, in a slide mechanism that suppresses the rotation of the shaft that supports the die table, a bearing is used to slidably engage the tool support board along the guide rail. Such a sliding mechanism such as a bearing with physical contact between solids requires an oil film for smooth operation. In addition, the sliding mechanism using the bearing is likely to cause oil shortage due to the reciprocating motion of the bearing, and may cause seizure due to friction. That is, the sliding mechanism using the bearing cannot cope with high-speed sliding. For this reason, it is difficult to increase the speed of reciprocation of the die table and improve the molding speed of the can body.

The present invention has been made in view of the above-described circumstances, and provides a can forming apparatus capable of improving the speed of reciprocation of a shaft while suppressing the rotation of the shaft that supports the die table. For the purpose.

The present invention adopts the following configuration in order to solve the above problems. A first aspect of the present invention includes a main frame, a turntable that is rotatably supported by the main frame, and in which a plurality of can body holding portions that removably hold the can body are arranged in an annular shape, and a table shaft A main shaft that penetrates the turntable along the main shaft, a die table that is supported by the main frame via the main shaft, and in which a plurality of processing tools for forming the can body are arranged in an annular shape, and the die table along the table axis A reciprocating device for reciprocating and a rotating device for intermittently rotating the turntable around a table axis, the can forming apparatus being spaced apart from the outer peripheral surface of the main shaft and parallel to the table axis A sub-shaft with both ends fixed to the main frame and one end fixed to the main shaft and the other end extending toward the sub-shaft Rotation of the main shaft including a member and an engagement device formed on the other end side of the connecting member and slidably engaging the connecting member with the sub shaft along the central axis of the sub shaft The engagement device is a can forming device that is a fluid bearing that supports the sub-shaft via a fluid.

According to the can forming apparatus of the first aspect of the present invention, the connecting member fixed to the main shaft and the sub shaft are slidably engaged with each other by the fluid bearing. Therefore, the coupling member and the sub shaft are indirectly bearing through the fluid.

This makes it possible to reciprocate the main shaft at high speed with a reciprocating device. By reciprocating the main shaft at a high speed, the processing speed of the can body by the processing tool formed on the die table can be increased. Therefore, it is possible to realize a can forming apparatus that can form a can body at high speed while suppressing the rotation of the main shaft that supports the die table.

According to a second aspect of the present invention, there is provided a fluid bearing having a bearing body, a bearing hole formed in the bearing body and through which a sub shaft passes, and a bearing surface having a pocket that opens to an inner surface of the bearing hole and supplies bearing fluid. And a can forming apparatus according to a first aspect.

In the third aspect of the present invention, the sub shaft has a rectangular bar shape with a rectangular cross section, and the bearing surface is formed so as to face two parallel surfaces of the outer surface of the sub shaft. It is a can shaping | molding apparatus of an aspect.

The fourth aspect of the present invention is the can forming apparatus according to the third aspect, wherein the bearing surface is formed so as to extend substantially at right angles to a tangent of a virtual circle centering on the table axis.

According to the present invention, it is possible to provide a can forming apparatus capable of improving the speed of reciprocation of the shaft while suppressing the rotation of the shaft supporting the die table.

It is the flowchart which showed the manufacturing process of the bottle can in steps. It is a schematic diagram which shows the change of the can body shape in each process. It is an external appearance perspective view which shows a can shaping | molding apparatus (bottle necker). It is a schematic sectional drawing which shows a can shaping | molding apparatus (bottle necker). It is a schematic sectional drawing which shows a can shaping | molding apparatus (bottle necker). It is a schematic perspective view which shows the die table supported by the main shaft, and the rotation prevention apparatus of a main shaft. It is an external appearance perspective view which shows a fluid bearing (engagement apparatus). It is a principal part expansion perspective view which shows the engagement state of a fluid bearing and a subshaft.

Hereinafter, a can forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. Each embodiment described below is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner for convenience, and the dimensional ratio of each component is the same as the actual one. Not necessarily.

First, a series of steps for manufacturing 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 diagram showing changes in the can shape in each step. For the bottle can, the plate material punching step S1, the cupping step (drawing step) S2, the drawing and ironing step S3, the trimming step S4, the printing / painting (can outer surface) step S5, the painting (can inner surface) step S6, the necking step S7, the screw molding It manufactures through step S8 in this order.

In the plate material punching step S1, for example, a rolled material made of an Al alloy material is punched, and a disk-shaped plate material (blank) W as shown in FIG. 2 (a) is formed (punched). In the cupping step (drawing step) S2, as shown in FIG. 2B, the plate material W is drawn (capping) by a cupping press to form a cup-shaped body (can base material) W1. In the drawing and ironing step S3, as shown in FIG. 2 (c), the cup body W1 is redrawn and ironed by a drawing and ironing device, and the can body 11 and the can bottom 14 are integrally bottomed. A cylindrical can body W2 is formed.

In the trimming step S4, since the height of the opening end portion 11a of the can body W2 is not uniform, the trimming device is used to trim the opening end portion 11a, as shown in FIG. A can body W3 after trimming is formed in which the heights of the open end portions 11a of the can body 11 are evenly aligned over the entire circumference.

Thereafter, the can body W3 is washed to remove lubricating oil and the like, and then the can body W3 is subjected to surface treatment to dry the can body W3. Next, as shown in FIG. 2E, in the printing / painting (can outer surface) step S5, printing and coating are performed on the outer surface side 11b of the can body W3, and then in the coating (can inner surface) step S6, the can The inner surface 11c of the body W3 is painted.

Next, in the necking step S7, as shown in FIG. 2 (f), using a die processing tool (neck forming mold), the neck of the can body 11 is smoothly inclined toward the open end 11a side. A neck portion 12 having a round shape is formed, and a can body (bottle can) 10 having the neck portion 12 is manufactured. Further, in the screw forming step S8, as shown in FIG. 2 (g), a screw groove 13 matching the shape of the cap is provided at the opening end of the neck portion 12 by using a rotary processing tool (forming tool). The can body (bottle can) 10 having the thread groove 13 is manufactured. The can forming apparatus according to the present embodiment is a can necking apparatus (bottle necker) used in the necking step S7 and the screw forming step S8.

The can body (bottle can) 10 obtained through the above steps is then filled with contents such as beverages inside the can body (bottle can) 10, and can body (bottle can) A cap that fits the screw groove 13 and covers the opening of the neck portion 12 is attached to the opening end of the neck portion 12 of the ten, and the inside of the can body 10 is sealed.

FIG. 3 is an external perspective view showing the can molding apparatus (bottle necker) of the present embodiment. 4 and 5 are schematic cross-sectional views showing a can forming apparatus (bottle necker), FIG. 4 shows a state where the die table is in the separated position, and FIG. 5 shows a state where the die table is in the approaching position. Show. The can molding device (bottle necker) 20 is used, for example, in the necking step S7 and the screw molding step S8 described above, and a main frame (main body portion) 21, a die table 22 that can reciprocate along the table axis TA, And a turntable 23 rotatably provided around the table axis TA.

The die table 22 is supported by the main frame 21 via a main shaft (shaft) 36 formed along the table axis TA. The die table 22 has a disk shape or a circular ring shape. The die table 22 is provided with a plurality of processing tools 26 for processing the can held by the turntable 23 in an annular shape along the circumferential direction of the table. The plurality of processing tools 26 are arranged along the table circumferential direction on the outer peripheral portion of the surface of the die table 22 facing the turntable 23. Further, each of the plurality of processing tools 26 is disposed to face each of the plurality of cans held by the turntable 23 in the direction of the table axis TA.

Further, the machining tool axis of the machining tool 26 of the die table 22 (the central axis of the machining tool 26) and the can axis of the can body facing the machining tool 26 on the turntable 23 (the central axis of the can body, that is, the holding member 27). Are arranged coaxially with each other. Then, in a state where the can axis and the processing tool axis coincide with each other, the can body is processed by the processing tool 26.

A plurality of mounting holes 22h (see FIG. 6) penetrating in the table axis TA direction are formed in the die table 22 so as to be arranged in the table circumferential direction. The plurality of processing tools 26 are attached to the plurality of attachment holes 22h in the order of processing into the can.

The plurality of processing tools 26 include a die processing tool and a rotation processing tool. In the present embodiment, a plurality of die processing tools and a plurality of rotation processing tools are detachably disposed in the plurality of mounting holes 22h of the die table 22 in the order of processing to the can body. Of the plurality of attachment holes 22h, some of the attachment holes 22h may be empty spaces where the processing tool 26 is not attached. An oiling tool is disposed in some of the plurality of mounting holes 22h.

The die processing tool moves in the can axis direction (direction parallel to the table axis TA) with respect to the can body, drawing processing to reduce the diameter of the peripheral wall (can body) of the can, and diameter expansion processing to expand the peripheral wall of the can. It is a mold for performing die processing such as. One type of die processing is performed on the can by one die processing tool.

The rotary tool moves around the can axis with respect to the can body, and by rotating around the can axis, the peripheral wall (can body) of the can body is trimmed, threaded, embossed, curled, and throttled (curled). Rotating processing such as caulking) is performed. One kind of rotational processing is applied to the can by one rotational processing tool.

The main shaft 36 is slidably penetrated through the center of the turntable 23. A plurality of holding members (can chucks) 27 that detachably hold the bottom of the can body to be formed are arranged in an annular shape along the circumferential direction of the table on the surface of the turntable 23 that faces the die table 22. Is formed. The opening ends of the cans held by these holding members 27 open toward the die table 22. The center axis (table axis TA) of each of the die table 22 and the turntable 23 extends in the horizontal direction and is arranged coaxially with each other.

The can molding device 20 includes a drive device (reciprocating device) 25 that reciprocates the die table 22 in the direction of the table axis TA with respect to the turntable 23. The drive device 25 is preferably capable of adjusting the stroke amount of the reciprocating motion. Further, the can molding apparatus 20 includes a rod 28 that connects the die table 22 and the driving device 25 and extends along the table axis TA, and is capable of adjusting a relative position of the table axis TA with respect to the die table 22; An index (rotating device) 29 for intermittently rotating the turntable 23 with respect to the table 22 in the table circumferential direction around the table axis TA, and a motor for relatively moving the die table 22 and the rod 28 along the table axis TA Including a moving device 31.

In this embodiment, the direction along the table axis TA (the direction in which the table axis TA extends) may be referred to as the table axis TA direction. In addition, a direction orthogonal to the table axis TA may be referred to as a table radial direction. Further, in the table radial direction, a direction away from the table axis TA may be referred to as an outer side in the table radial direction, and a direction approaching the table axis TA may be referred to as an inner side in the table radial direction. In addition, a direction that circulates around the table axis TA is referred to as a table circumferential direction. Of the table circumferential directions, the direction in which the turntable 23 is intermittently rotated with respect to the die table 22 is referred to as the turntable rotation direction, and the rotation opposite to the direction in which the turntable 23 is intermittently rotated with respect to the die table 22. The direction is called the opposite direction of the turntable rotation direction.

The turntable rotation direction is the same as the direction in which a plurality of processing tools 26 are arranged in the table circumferential direction in the order of processing into cans in the die table 22. Therefore, the turntable rotation direction is the downstream side of the processing order to the can (or the direction from the upstream side to the downstream side, the processing forward direction), and the side opposite to the turntable rotation direction is the processing order to the can. The upstream side (or the direction from the downstream side to the upstream side).

The drive device 25 provided on the main frame 21 causes the die table 22 and the turntable 23 to repeat the approaching and separating movements in the table axis TA direction. Further, the die table 22 and the turntable 23 are intermittently relatively rotated in the circumferential direction of the table by an index 29 provided on the main frame 21.

Specifically, the die table 22 moves between a separation position separated from the turntable 23 (see FIG. 4) and an approach position approaching the turntable 23 (see FIG. 5). Then, during one stroke (reciprocating motion) in which the die table 22 and the turntable 23 are separated and approached, the turntable 23 rotates and moves by a predetermined amount (intermittent rotation) in the turntable rotation direction in the table circumferential direction. .

Then, for each stroke in which the die table 22 and the turntable 23 approach and separate, the can body held by the holding member 27 of the turntable 23 is processed by the processing tool 26 provided on the die table 22, The turntable 23 moves the processed can body toward the next (another) processing position by the next (another) processing tool 26 toward the downstream side (turntable rotation direction) in the processing order.

By repeating the above operation, the can body held by the holding member 27 of the turntable 23 is sequentially processed by a plurality of processing tools 26 provided on the die table 22. When a series of processing is completed, a bottle can having a desired shape (see FIG. 2G) is formed.

The driving device (reciprocating device) 25 includes a driving motor (not shown), a driving shaft 32 to which a rotational driving force is transmitted from the driving motor, and a rotational motion around the central axis DA of the driving shaft 32 in a straight line in the table axis TA direction. A crank mechanism 33 for converting into motion, and a variable stroke mechanism (stroke adjustment mechanism) 34 capable of adjusting the reciprocation (stroke amount) of the rod 28 coupled to the crank mechanism 33 in the direction of the table axis TA are provided. .

The driving device 25 reciprocates the die table 22 connected to the rod 28 in the direction of the table axis TA with respect to the turntable 23 by stroke (reciprocating) the rod 28 in the direction of the table axis TA. The drive device 25 can adjust the stroke amount of the reciprocating movement of the die table 22 in the direction of the table axis TA with respect to the turntable 23.

In addition, as the drive device 25, the well-known structure of patent document 3 or patent document 4 can be used, for example.

The rod 28 is disposed between the connecting rod 35 of the crank mechanism 33 and the die table 22, and connects the connecting rod 35 and the die table 22. In the example of the present embodiment, a cylindrical main shaft (shaft) 36 that is provided integrally with the die table 22 and extends on the table axis TA penetrates the turntable 23 in the direction of the table axis TA, and the inside of the main frame 21. The rod 28 is accommodated in the main shaft 36.

A cylinder 39 is disposed inside the main shaft 36. The cylindrical body 39 is disposed so that the central axis thereof is coaxial with the table axis TA, and is provided on the outer side in the radial direction of the rod 28. The cylindrical body 39 is rotatable in the table circumferential direction with respect to the main shaft 36 and the rod 28. The outer peripheral surface of the cylindrical body 39 slides in the table circumferential direction with respect to the inner peripheral surface of the main shaft 36. A female screw portion 38 is formed on the inner peripheral surface of the cylindrical body 39. Further, the movement of the cylindrical body 39 in the direction of the table axis TA with respect to the main shaft 36 is restricted.

A male screw portion 37 is formed in a region corresponding to at least the cylindrical body 39 along the table axis TA direction in the outer peripheral surface of the rod 28. The male thread part 37 of the rod 28 is screwed into the female thread part 38 of the cylinder 39. Therefore, the cylindrical body 39 is moved in the table axis TA direction with respect to the rod 28 in accordance with the screwing amount of the male screw portion 37 and the female screw portion 38.

With this structure, when the cylinder 39 is rotated around the table axis TA with respect to the main shaft 36 and the rod 28, the cylinder 39 and the main shaft 36 move in the direction of the table axis TA with respect to the rod 28. . The position of the die table 22 in the table axis TA direction with respect to the rod 28 can be adjusted.

Specifically, in the example of the present embodiment, the moving device 31 is provided on the surface of the die table 22 facing the side opposite to the side where the turntable 23 is located. The moving device 31 can rotate the cylindrical body 39 around the table axis TA and relatively move the rod 28 and the die table 22 in the direction of the table axis TA.

The moving device 31 has a gear mechanism that meshes with a gear provided in the cylinder 39 and a motor that rotates the gear mechanism. The motor is, for example, a servo motor or a stepping motor. The moving device 31 transmits the rotational force of the motor to the cylinder 39 through the gear mechanism. Accordingly, the die body 22 is moved forward and backward in the direction of the table axis TA with respect to the rod 28 by rotating the cylindrical body 39 around the table axis TA. In addition to using a motor, the moving device 31 can also use, for example, a manual rotation handle that rotates a gear mechanism.

The main shaft 36 and the rod 28 are inserted through the center of the index (rotating device) 29 provided on the main frame 21. The index 29 rotates the turntable 23 intermittently relative to the die table 22 in the table circumferential direction.

FIG. 6 is a schematic perspective view showing a die table supported by the main shaft and a main shaft rotation preventing device. An anti-rotation device 40 for preventing the main shaft 36 from rotating is formed inside the main frame 21. The rotation preventing device 40 includes a sub shaft 41, a connecting member 42, and a fluid bearing 43 that is an engaging device formed on the connecting member 42.

The sub-shaft 41 is a rod-shaped (rectangular) member having a rectangular (quadrangle) cross section, and is disposed so as to be separated from the outer peripheral surface of the main shaft 36 and extend in parallel with the table axis TA. The sub shaft 41 is fixed to the main frame 21 by rod-

like support members

41a and 41b at one end and the other end thereof. The

support members

41 a and 41 b are members that connect the sub shaft 41 and the main frame 21. In the present embodiment, the

support members

41a and 41b are rod-shaped members, but are not limited thereto. The

support members

41a and 41b only need to have a length between the sub shaft 41 and the main frame 21 so that the end portion on the one end 42b side in the major axis direction of the connecting member 42 described later can be disposed. In other words, the lengths of the

support members

41a and 41b can be appropriately changed according to the design of the endmost portion on the one end 42b side in the major axis direction of the connecting member 42. Each of the

support members

41a and 41b includes an adjustment screw 41s. By rotating the adjustment screw 41s, the

support members

41a and 41b can finely adjust the separation position of the sub shaft 41 with respect to the main shaft 36 (that is, the distance between the main shaft 36 and the sub shaft 41). it can.

The connecting member 42 is a substantially elliptical plate-like member, and is fixed to one end portion of the main shaft 36 by, for example, a screw on the one end 42a side in the long axis direction. Further, a through hole 42h through which the rod 28 is slidably penetrated is formed on the one end 42a side of the connecting member 42. The connecting member 42 is formed so that the other end 42 b side in the major axis direction extends toward the sub shaft 41. Further, a fluid bearing (engagement device) 43 that slidably engages the connecting member 42 and the sub shaft 41 is formed on the other end 42 b side of the connecting member 42.

FIG. 7 is an external perspective view showing a fluid dynamic bearing (engagement device). FIG. 8 is an enlarged perspective view of a main part showing an engaged state between the fluid dynamic bearing and the sub shaft. The fluid bearing (engagement device) 43 is a non-contact bearing called a hydrostatic bearing or a hydrostatic bearing in which members (sub-shaft 41 and connecting member 42) that slide with each other do not contact each other.

For example, the fluid bearing (engagement device) 43 includes a bearing body 52 incorporated on the other end 42b side of the coupling member 42, and a bearing hole 53 formed in the bearing body 52 through which the sub shaft 41 is movably penetrated. I have.

In the bearing hole 53, bearing surfaces 54a and 54b facing each other are formed. The bearing surfaces 54 a and 54 b are formed so as to face two outer surfaces 41 f 1 and 41 f 2 parallel to each other among the four outer surfaces along the longitudinal direction of the sub shaft 41. The gaps (gap) between the bearing

surfaces

54a and 54b and the outer surfaces 41f1 and 41f2 of the sub shaft 41 are, for example, about 30 μm to 50 μm.

In the present embodiment, the bearing surfaces 54a and 54b are formed so as to extend in a direction substantially perpendicular to the tangent L of the virtual circle Q with the table axis TA (see FIGS. 4 and 6) as the center. . As shown in FIG. 7, the direction of the tangent L of the virtual circle Q is along the direction of the stress in which the rotational stress applied to the main shaft 36 is transmitted to the bearing body 52 via the connecting member 42.

The pockets 55 are formed in the bearing surfaces 54a and 54b, respectively. The pocket 55 is a groove having a concave cross section that opens to the surfaces of the bearing surfaces 54a and 54b. In the present embodiment, two grooves are formed in a substantially X shape along the surfaces of the bearing surfaces 54a and 54b. Such pockets 55 allow the bearing fluid to ooze out onto the surfaces of the bearing surfaces 54a and 54b, respectively, between the outer surface 41f1 of the sub shaft 41 and the bearing surface 54a, and between the outer surface 41f2 and the bearing surface 54b, respectively. The film is formed.

The pockets 55 formed on the bearing surfaces 54a and 54b are connected to supply

pipes

56a and 56b connected to a bearing fluid supply source (not shown). The

supply pipes

56a and 56b are composed of a flexible pipe that can follow the reciprocating motion of the fluid dynamic bearing 43, several connection fittings, and the like. A bearing fluid is supplied to the pocket 55 formed on the bearing surface 54a via the supply pipe 56a, and a bearing fluid is supplied to the pocket 55 formed on the bearing surface 54b via the supply pipe 56b. .

For example, a general lubricating oil is used as the bearing fluid. Such lubricating oil is continuously supplied to the pocket 55 through the

supply pipes

56a and 56b, and between the outer surface 41f1 and the bearing surface 54a of the sub shaft 41 and between the outer surface 41f2 and the bearing surface 54b, respectively. While forming an oil film, it flows down as it is.

The operation of the can molding apparatus 20 including the rotation preventing apparatus 40 including the fluid bearing (engagement apparatus) 43 having the above-described configuration will be described. When forming a can body using the can forming apparatus (bottle necker) 20 of the present embodiment, the bottom of the can body is held by a holding member (can chuck) 27 formed on the turntable 23 to drive the drive body. The reciprocating device 25 reciprocates the die table 22 between the separation position (see FIG. 4) and the approach position (see FIG. 5), and presses the processing tool 26 against the open end of the can body. Thereby, the neck part 12 and the thread groove 13 (refer (g) of FIG. 2) are shape | molded by the can.

When such a can is formed, stress is applied to the main shaft 36 that supports the turntable 23 that passes through the center of the turntable 23 that rotates. In order to suppress the rotation of the main shaft 36 (die table 22) due to the rotational stress applied to the main shaft 36, the rotation preventing device 40 is separated from the outer peripheral surface of the main shaft 36 and extends in parallel with the table axis TA. The sub shaft 41 is fixed to the main frame 21, and the sub shaft 41 and the main shaft 36 are engaged with each other through the connecting member 42. Thereby, rotation of the main shaft 36 is suppressed.

The connecting member 42 and the sub shaft 41 are slidably engaged via a fluid bearing (engagement device) 43, and follow the movement of the die table 22 along the table axis TA to follow the main shaft 36. The connecting member 42 fixed to one end of the sub-shaft 41 is movable along the central axis of the sub-shaft 41.

Then, a fluid bearing 43 is used as a bearing for slidably engaging the connecting member 42 whose one end side in the major axis direction is fixed to the main shaft 36 and the sub shaft 41. As a result, it is possible to cope with high-speed reciprocation of the die table 22.

That is, it is difficult to cope with high-speed sliding due to friction or the like in a conventional bearing such as a bearing having physical contact between solids. However, in the can molding apparatus of the present invention, the coupling member 42 fixed to the main shaft 36 and the sub shaft 41 constituting the rotation preventing device 40 are slidably engaged by the fluid bearing 43. Thereby, the connection member 42 and the sub shaft 41 are indirectly bearing through the fluid (bearing oil).

Thus, the main shaft 36 can be reciprocated at high speed by the drive device (reciprocating device) 25. For example, the maximum speed of the connecting member 42 with respect to the sub-shaft 41 is limited to about 1.55 m / s when a conventional bearing using a ball bearing is used. On the other hand, when the fluid bearing 43 is used as in the present invention, the maximum speed of the connecting member 42 with respect to the sub-shaft 41 is, for example, about 1.9 m / s to 2.2 m / s. It is possible to increase the speed to 1.3 to 1.4 times as compared with the case of using a bearing using.

Thus, by reciprocating the main shaft 36 at a high speed, the processing speed of the can by the processing tool 26 formed on the die table 22 is increased. Therefore, the can forming apparatus 20 that can form the can at high speed while suppressing the rotation of the main shaft 36 that supports the die table 22 can be realized.

The direction of rotational stress applied to the main shaft 36 includes a bearing surface 54a that forms an oil film with the outer surface 41f1 of the sub shaft 41 and a bearing surface 54b that forms an oil film with the outer surface 41f2 of the sub shaft 41. It is formed so as to spread in a direction that intersects at a substantially right angle to. As a result, when the fluid bearing 43 finely moves in a direction in which one of the gaps between the outer surfaces 41f1 and 41f2 of the sub shaft 41 and the bearing surfaces 54a and 54b is contracted, the other is caused by the repulsive force of the oil film. The hydrodynamic bearing 43 is finely moved in the direction in which the gap is reduced (reverse direction).

Thereby, the clearance between the bearing surface 54a and the outer surface 41f1 of the sub shaft 41 and the clearance between the bearing surface 54b and the outer surface 41f2 of the sub shaft 41 are always kept constant. With such an automatic alignment function, even if a rotational stress is applied to the main shaft 36, the outer surfaces 41f1 and 41f2 of the sub-shaft 41 do not come into contact with the bearing surfaces 54a and 54b. It becomes possible to suppress movement.

In the embodiment described above, a rectangular bar-shaped member having a rectangular cross section is used as the sub shaft 41, but the present invention is not limited to this. For example, sub-shafts of various shapes such as a round bar having a circular cross section and a hexagonal bar having a cross section can be applied. The shape of the bearing hole 53 of the fluid dynamic bearing (engagement device) 43 may be matched with the shape of the sub shaft 41 to be penetrated.

As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

10 Can body (bottle can)
20 Can molding equipment (bottle necker)
21 Main frame (main part)
22 Die table 23 Turntable 25 Drive device (reciprocating device)
29 Index (Rotating device)
36 Main shaft 40 Anti-rotation device 41 Sub shaft 42 Connecting member 43 Fluid bearing (engagement device)
52 Bearing body 53

Bearing hole

54a, 54b Bearing surface
TA Table axis Q Virtual circle L Tangent

Claims

The mainframe,
A turntable in which a plurality of can body holding portions that are rotatably supported by the main frame and removably hold the can body are arranged in an annular shape,
A main shaft passing through the turntable along the table axis;
A die table supported by the main frame via the main shaft and in which a plurality of processing tools for forming the can body are arranged in an annular shape;
A reciprocating device for reciprocating the die table along the table axis;
A rotating device that intermittently rotates the turntable around the table axis,
A sub-shaft that is spaced apart from the outer peripheral surface of the main shaft and that extends parallel to the table axis, and whose both ends are fixed to the main frame;
One end side is fixed to the main shaft, and the other end side extends toward the sub-shaft,
An engaging device that is formed on the other end side of the connecting member and slidably engages the connecting member with the sub shaft along a central axis of the sub shaft;
Including an anti-rotation device for the main shaft,
The can forming apparatus, wherein the engagement device is a fluid bearing that supports the sub shaft via a fluid.
The fluid bearing includes a bearing body, a bearing hole formed in the bearing body and through which the sub-shaft passes, and a bearing surface provided with a pocket that opens to an inner surface of the bearing hole and supplies bearing fluid. The can molding apparatus according to claim 1.
3. The can forming apparatus according to claim 2, wherein the sub shaft has a rectangular bar shape with a rectangular cross section, and the bearing surface is formed to face two parallel surfaces of the outer surface of the sub shaft.
4. The can forming apparatus according to claim 3, wherein the bearing surface is formed so as to extend in a direction substantially perpendicular to a tangent of a virtual circle centered on the table axis.