JP2022020315A - Can molding device - Google Patents

Abstract

To provide a can molding device which can keep a loss of force, that is transmitted from a cup holder driving mechanism to a cup presser mechanism, small, and can extend a component service life.SOLUTION: A can molding device comprises: a ram shaft extending in a cross direction; a punch located at a front end part of the ram shaft; a reciprocating linear motion mechanism which is connected to rear end portion of the ram shaft and performs reciprocating motion of the ram shaft in the cross direction; a die with an open hole in which the punch is inserted; a cup presser mechanism 30 having a cup holder sleeve 31 which presses a cup-shaped body against an end face where the open hole of the die opens; and a cup holder driving mechanism 10 which oscillates the cup presser mechanism 30 in the cross direction. The cup holder driving mechanism 10 has a cum structure, and is located directly under the cup presser mechanism 30.SELECTED DRAWING: Figure 3

Description

The present invention relates to a can molding apparatus.

Conventionally, a DI (Drawing & Ironing) can having a bottomed cylinder is known. The DI can is manufactured by subjecting a disk-shaped blank made of an aluminum alloy to cupping processing, DI processing, and the like. In the cupping process, the blank is drawn to form a cup-shaped body. In DI processing, while pressing the cup-shaped body with the cup holder, it is squeezed and squeezed between the punch and the die.

As a can molding apparatus that performs DI processing on a cup-shaped body, for example, those described in Patent Documents 1 and 2 are known. The can forming device includes a ram shaft extending in the front-rear direction, a punch arranged at the front end of the ram shaft, and a reciprocating linear motion mechanism connected to the rear end of the ram shaft to reciprocate and linearly move the ram shaft in the front-rear direction. , A die with a through hole into which a punch is inserted, a cup holding mechanism (cup holder) having a cup holder sleeve that presses a cup-shaped body against the end face where the through hole of the die opens, and a cup holding mechanism that swings in the front-back direction. It is equipped with a cup holder drive mechanism to make it.

In Patent Document 1, a blank holder drive device is connected to a cup holding mechanism via a coupling device.
Patent Document 2 swings the cup holding mechanism in the front-rear direction by a servomotor.

U.S. Patent Application Publication No. 2018/0272410 Japanese Patent No. 6456959

In a conventional can molding device, the cup holder drive mechanism may have a cam structure. In this case, the cup holder drive mechanism is arranged apart from the cup holding mechanism in the left-right direction orthogonal to the front-rear direction. Specifically, this cup holder drive mechanism is a cup holding mechanism via a plurality of shafts connected in the left-right direction, a joint member connecting these shafts, and a pair of arms for moving the cup holding mechanism back and forth. Is concatenated with. For this reason, the connection portion between the shaft and the joint member may be loosened or the long shaft may be twisted. That is, there is a possibility that a loss may occur in the force transmitted from the cup holder drive mechanism to the cup holding mechanism, or the load acting on the pair of arms may become uneven and affect the life of the component.

One of the objects of the present invention is to provide a can molding apparatus capable of suppressing the loss of force transmitted from the cup holder drive mechanism to the cup holding mechanism to a small extent and extending the life of parts.

One aspect of the can forming apparatus of the present invention is a ram shaft extending in the front-rear direction, a punch arranged at the front end portion of the ram shaft, and a rear end portion of the ram shaft connected to the ram shaft. A reciprocating linear motion mechanism that reciprocates linearly in a direction, a die having a through hole into which the punch is inserted, and a cup holding mechanism having a cup holder sleeve that presses a cup-shaped body against an end surface of the die through which the through hole opens. A cup holder drive mechanism that swings the cup holder mechanism in the front-rear direction is provided, and the cup holder drive mechanism has a cam structure and is arranged directly under the cup holder mechanism.

In the can forming apparatus of the present invention, since the cup holder drive mechanism has a cam structure, it is easy to synchronize the reciprocating linear motion mechanism for moving the ram shaft back and forth with the cup holder drive mechanism. Since the cup holder drive mechanism is arranged directly below the cup holding mechanism (cup holder), the distance between these mechanisms can be kept short. In order to connect the cup holder drive mechanism and the cup holding mechanism, it is not necessary to connect a plurality of shafts in series or to use a joint member or the like as in the conventional case, and the number of parts is reduced according to the present invention. Therefore, the manufacturing cost can be reduced. Further, the dimensions of the member connecting the cup holder drive mechanism and the cup holding mechanism can be suppressed to a small size.

According to the present invention, it is possible to suppress the occurrence of loss in the force transmitted from the cup holder drive mechanism to the cup holding mechanism. The power to drive the cup holder drive mechanism can be reduced, resulting in energy reduction. In addition, it is easy to equalize the load acting on each member connecting the cup holder drive mechanism and the cup holding mechanism, and it is possible to suppress the variation in the component life of each member, resulting in the component life. Can be extended. The cup holding mechanism, which is moved back and forth by the cup holder drive mechanism, stably presses the cup-shaped body against the end face of the die, so that the molding accuracy of the can is maintained well. The structure of the can molding device can be simplified and the outer shape can be kept compact.

It is preferable that the can forming apparatus includes a gear that transmits a rotational driving force around the rotation axis of the reciprocating linear motion mechanism to the cup holder driving mechanism.

In this case, the power transmission loss can be suppressed to be smaller than that in the configuration in which the rotational driving force of the reciprocating linear motion mechanism is transmitted to the cup holder driving mechanism via, for example, a belt or the like. In addition, the can molding apparatus can be configured more compactly.

In the can forming apparatus, the cup holder drive mechanism is parallel to the first central axis by contacting a cam rotated around a first central axis extending in a left-right direction orthogonal to the front-rear direction and the cam. A swinging portion that swings around the second central axis and a swinging portion that is arranged on both sides of the ram shaft in the left-right direction and swings around the second central shaft together with the swinging portion to hold the cup holding mechanism. It is preferable to have a pair of arms that move back and forth.

In this case, the rotation around the first central axis input to the cup holder drive mechanism is converted into the swing around the second central axis by the cam and the swing portion, and is output from the pair of arms. The pair of arms are arranged on both sides of the ram shaft in the left-right direction and act evenly on the cup holding mechanism. As a result, the cup holding mechanism stably presses the cup-shaped body against the end face of the die, and the molding accuracy of the can is stably ensured.

In the can forming apparatus, the cup holding mechanism is provided between the cup holder sleeve, a pair of rods connected to the pair of arms, and the cup holder sleeve and the pair of rods, and the cup holder is provided. It is preferable to have an urging portion that can urge the sleeve forward by air pressure.

In this case, the cup pressing mechanism urges the cup holder sleeve forward with air pressure by the urging portion, so that the pressure at which the cup holder sleeve presses the cup-shaped body against the end face of the die (cup pressing pressure) is the initial operation of the device. Stable from. Further, according to the above configuration of the present invention, it is easier to adjust the cup pressing pressure as compared with the case where the cup holder sleeve is urged forward by hydraulic pressure, for example.

It is preferable that the can forming apparatus includes a bearing that slidably supports the ram shaft in the front-rear direction, and the cup holder drive mechanism is arranged directly below the bearing.

In this case, since the cup holding mechanism, the bearing, and the cup holder drive mechanism are arranged adjacent to each other in the vertical direction, the can molding device can be configured more compactly.

The can forming apparatus includes bearings that slidably support the ram shaft in the front-rear direction. The bearings are provided in pairs at intervals in the front-rear direction, and the pair of bearings are integrally formed. It is preferable to be done.

In this case, it is easy to align the pair of bearings, that is, the front bearing and the rear bearing, and the centering work at the time of assembly or the like can be omitted or simplified. Since the straightness of the ram shaft is maintained well, the molding accuracy of the can is stably ensured.

According to the can molding apparatus according to one aspect of the present invention, the loss of force transmitted from the cup holder drive mechanism to the cup holding mechanism can be suppressed to a small extent, and the life of parts can be extended.

FIG. 1 is a schematic view schematically showing the can molding apparatus of this embodiment. FIG. 2 is a perspective view showing a part of the configuration of the can molding apparatus. FIG. 3 is a partially transparent perspective view showing a cup holder drive mechanism, a cup holding mechanism, and a bearing unit of a can molding device. 4 (a), (b) and (c) are side views illustrating the operation of the cup holder drive mechanism and the cup holding mechanism of the can molding apparatus.

The can molding apparatus 1 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the can forming apparatus 1 of the present embodiment is a DI can manufacturing apparatus in which a cup-shaped body W, which is a work, is subjected to DI processing to obtain a DI can 100.

First, the DI can 100 will be described.
The DI can 100 has a bottomed tubular shape. The DI can 100 is used for a can body such as a two-piece can or a bottle can in which the contents such as a beverage are filled and sealed. In the case of a two-piece can, the can body includes a DI can 100 and a disk-shaped can lid wrapped around the open end of the DI can 100. In the case of a bottle can, the can body includes a bottle can body in which the DI can 100 is necked, screwed, or the like, and a cap screwed to the open end of the bottle can body.

The DI can 100 is formed into a bottomed tubular shape by subjecting a disk-shaped blank punched from a plate material such as an aluminum alloy to a cupping step (squeezing step) and a DI step (squeezing ironing step). Specifically, in the case of a two-piece can, for example, the DI can 100 is manufactured through a plate material punching step, a cupping step, a DI step, a trimming step, a printing step, a painting step, a necking step, and a franging step in this order.

In the process of manufacturing the DI can 100, the blank is drawn (cupping) by a cupping press and formed into a cup-shaped body W. That is, the cup-shaped body W is a molding intermediate produced in the process of transferring from the blank to the DI can 100 in the cupping step. The cup-shaped body W is a bottomed cylinder having a smaller peripheral wall height (length along the can axis direction) and a larger diameter than the DI can 100.

Next, the can molding apparatus 1 will be described.
The can forming apparatus 1 is used in the above DI step, and the cup-shaped body W is subjected to DI processing, that is, drawing (re-drawing) ironing processing, and the height of the peripheral wall is larger than that of the cup-shaped body W and the diameter is large. Is molded into a small DI can 100. Further, in the DI step, the can forming apparatus 1 forms the can bottom of the DI can 100 into a dome shape.

The can forming apparatus 1 is a die 8 having a ram shaft 3 extending in the axial direction about a central shaft O, a punch 2, a reciprocating linear motion mechanism 4, a bearing unit 50, and a through hole 7 into which the punch 2 is inserted. A cup holding mechanism (cup holder) 30 having a cup holder sleeve 31 for pressing the cup-shaped body W against the end surface 9 through which the through hole 7 of the die 8 opens, a cup holder driving mechanism 10, a gear 20, and a punch 2. A dormer 6 for sandwiching the bottom of the DI can 100 and forming it into a dome shape is provided between the two.
The ram shaft 3, the punch 2, the bearing unit 50, the through hole 7 of the die 8, the cup holder sleeve 31, and the central shaft O of the dormer 6 are arranged coaxially with each other. In the present embodiment, the central axis O, which is a common axis of these members, extends in the horizontal direction.

Further, the can forming apparatus 1 has a cup feeder (not shown) that supplies the cup-shaped body W on the end surface 9 of the die 8, a receiving seat (not shown) that holds the cup-shaped body W on the end surface 9, and molding. Air is discharged from the can transport mechanism (not shown) for transporting the subsequent DI can 100 to the outside of the apparatus and an air discharge hole opened at at least one of the tip surface and the outer peripheral surface of the punch 2, and the DI can 100 is discharged from the punch 2. It is provided with an air discharge mechanism (not shown) for releasing the mold and a drive source (not shown) such as a drive motor.

In the present embodiment, the direction in which the central axis O extends (X-axis direction) is referred to as a front-back direction. In the front-rear direction, the die 8 and the reciprocating linear motion mechanism 4 are arranged at different positions from each other. Of the front-back directions, the direction from the reciprocating linear motion mechanism 4 toward the die 8 (-X side) is called the front side, and the direction from the die 8 toward the reciprocating linear motion mechanism 4 (+ X side) is called the rear side. The front-back direction may be paraphrased as the axial direction. In this case, the front side is one side in the axial direction and the rear side is the other side in the axial direction.
The vertical direction (Z-axis direction) is called the vertical direction. In each figure, the + Z side is the upper side and the −Z side is the lower side.
Of the horizontal directions, the direction orthogonal to the front-back direction, that is, the direction orthogonal to the front-back direction and the up-down direction (Y-axis direction) is called the left-right direction. In each figure, the + Y side is the right side and the −Y side is the left side.

The ram shaft 3 has a shaft shape extending in the front-rear direction. The ram shaft 3 is slidably supported by the bearing unit 50 in the front-rear direction.
The punch 2 is arranged at the front end of the ram shaft 3. The punch 2 is cylindrical or cylindrical and extends in the anteroposterior direction.

The reciprocating linear motion mechanism 4 has a ram shaft connecting portion 4a. The reciprocating linear motion mechanism 4 converts a rotational driving force around the axis of rotation C input from a drive source (not shown) into a reciprocating linear motion in the front-rear direction and outputs the rotational driving force to the ram shaft connecting portion 4a. The ram shaft connecting portion 4a is connected to the rear end portion of the ram shaft 3. That is, the reciprocating linear motion mechanism 4 is connected to the rear end portion of the ram shaft 3 and reciprocates and linearly moves the ram shaft 3 in the front-rear direction.

The bearing unit 50 is arranged between the reciprocating linear motion mechanism 4 and the die 8 in the front-rear direction. As shown in FIGS. 2 and 3, the bearing unit 50 has a cylindrical shape extending in the front-rear direction. The bearing unit 50 includes a bearing 5 that slidably supports the ram shaft 3 in the front-rear direction. That is, the can molding apparatus 1 includes a bearing 5. A pair of bearings 5 are provided at intervals in the front-rear direction. The pair of bearings 5 are integrally formed with the bearing unit 50. Of the pair of bearings 5, one bearing 5 located on the front side is the front bearing 5F, and the other bearing 5 located on the rear side is the rear bearing 5R. The front bearing 5F and the rear bearing 5R have a fluid bearing structure called, for example, a hydrostatic bearing or a hydrostatic bearing.

As shown in FIG. 1, a plurality of dies 8 are provided side by side in the front-rear direction. Each of the plurality of dies 8 has a through hole 7 having a circular cross section that penetrates the die 8 in the front-rear direction. The plurality of dies 8 have one re-squeezing die 8A and a plurality of ironing dies (ironing dies) 8B located in front of the re-squeezing die 8A. Although not particularly shown, a pilot ring is arranged on the front side of each ironing die 8B. By providing the pilot ring, it is possible to prevent the punch 2 from coming into contact with each ironing die 8B due to the impact when the DI can 100 comes off (passes) from each ironing die 8B during molding.
Further, at the time of molding, a coolant liquid is supplied to the redrawing die 8A and each ironing die 8B for lubrication and cooling.

As shown in FIGS. 2 and 3, the cup holding mechanism 30 includes a cup holder sleeve 31, a pair of rods 32 connected to a pair of arms 15 described later of the cup holder drive mechanism 10, and a pair of cup holder sleeves 31. It has an urging portion 33 which is provided between the rod 32 and the cup holder sleeve 31 and can urge the cup holder sleeve 31 forward by air pressure.

The cup holder sleeve 31 has a cylindrical shape extending in the front-rear direction. As shown in FIG. 1, the punch 2 and the ram shaft 3 are inserted in the cup holder sleeve 31 in the front-rear direction. The cup holder sleeve 31, the punch 2 and the ram shaft 3 are relatively slidable in the front-rear direction. The cup holder sleeve 31 can press the bottom wall of the cup-shaped body W against the end surface 9 facing the rear side of the redraw die 8A. The cup holder sleeve 31 is inserted into the cup-shaped body W arranged on the end surface 9 of the die 8 and presses the bottom wall of the cup-shaped body W against the end surface 9 to support it.

As shown in FIGS. 1 to 3, the pair of rods 32 are arranged on both sides of the ram shaft 3 in the left-right direction with the ram shaft 3 interposed therebetween. Each rod 32 extends in the front-rear direction. In the present embodiment, the front portion of the bearing unit 50 including at least the front bearing 5F is located between the pair of rods 32.

The rod 32 has a rod body 32a and a roller 32b.
The rod body 32a has a shaft shape or a cylindrical shape, and extends in the front-rear direction. The rod bodies 32a of the pair of rods 32 are parallel to each other. The rod body 32a is slidably supported in the front-rear direction by, for example, a ball spline or a dry bearing.
The roller 32b is projected from the rod body 32a in the left-right direction. The roller 32b is rotatable around a roller axis extending in the left-right direction and is supported by the rod body 32a. An arm 15, which will be described later, is connected to the roller 32b.

The urging portion 33 has a substantially cylindrical shape. The punch 2 and the ram shaft 3 are inserted into the urging portion 33 in the front-rear direction. The urging portion 33, the punch 2 and the ram shaft 3 are relatively slidable in the front-rear direction.

As shown in FIGS. 2 and 3, the urging portion 33 includes a rod mounting portion 33a, a cup holder sleeve mounting portion 33b, and an airbag 33c.
The rod mounting portion 33a is a cylindrical housing centered on the central axis O. The rod mounting portion 33a is mounted on the rod 32. The rear wall of the rod mounting portion 33a is fixed to the front end portion of the rod body 32a.

The cup holder sleeve mounting portion 33b has an annular plate shape centered on the central axis O. The cup holder sleeve mounting portion 33b is arranged on the front side of the rod mounting portion 33a. The cup holder sleeve mounting portion 33b is mounted on the rear end portion of the cup holder sleeve 31. The cup holder sleeve mounting portion 33b and the cup holder sleeve 31 can be slidably moved in the front-rear direction with respect to the rod mounting portion 33a.

The airbag 33c is an annular shape centered on the central axis O. The airbag 33c is sandwiched between the rear wall of the rod mounting portion 33a and the cup holder sleeve mounting portion 33b in the front-rear direction. The airbag 33c can internally hold air supplied from an air supply means (not shown). The airbag 33c is made of rubber, for example, and is elastically deformable.

When the rod mounting portion 33a is pushed forward by the rod 32 that moves back and forth, the urging portion 33 urges the cup holder sleeve 31 toward the front side via the airbag 33c and the cup holder sleeve mounting portion 33b. do. That is, the urging portion 33 urges the cup holder sleeve 31 forward by the air pressure and the elastic restoring force of the airbag 33c. As a result, the cup-shaped body W is pressed against the end surface 9 of the die 8 and is held in close contact with the cup holder sleeve 31.

As shown in FIG. 1, the cup holder drive mechanism 10 swings the cup holding mechanism 30 in the front-rear direction. Specifically, the cup holder drive mechanism 10 converts the rotational driving force transmitted from a drive source (not shown) via the reciprocating linear motion mechanism 4 and the gear 20 into a reciprocating motion in the front-rear direction to the cup holding mechanism 30. By transmitting this, the cup holding mechanism 30 is reciprocated linearly in the front-rear direction with a stroke length different from that of the ram shaft connecting portion 4a.

The cup holder drive mechanism 10 has a cam structure synchronized with the reciprocating linear motion mechanism 4. The cup holder drive mechanism 10 is arranged directly below the cup holding mechanism 30. Specifically, the cup holder drive mechanism 10 is arranged adjacent to the lower side of at least a part of the rod 32 in the cup holding mechanism 30. When viewed from the vertical direction, the cup holding mechanism 30 and the cup holder driving mechanism 10 overlap each other. Further, the cup holder drive mechanism 10 is arranged directly below the bearing unit 50. That is, the cup holder drive mechanism 10 is arranged directly below the bearing 5. When viewed from the vertical direction, the bearing 5 (bearing unit 50) and the cup holder drive mechanism 10 overlap each other.

As shown in FIGS. 2 and 3, the cup holder drive mechanism 10 has a camshaft 11 centered on a first central axis J1 extending in the left-right direction, a cam 12, and a second center parallel to the first central axis J1. It has a swing shaft 13 centered on a shaft J2, a swing portion 14, and a pair of arms 15.
The first central axis J1 and the second central axis J2 are arranged apart from each other. In the present embodiment, the second central axis J2 is located on the front side and the upper side of the first central axis J1. The axial direction in which the first central axis J1 extends and the axial direction in which the second central axis J2 extends correspond to the left-right direction, respectively.

In the following description, the direction orthogonal to the first central axis J1 is referred to as the first radial direction. Of the first radial directions, the direction closer to the first central axis J1 is called the inner side in the first radial direction, and the direction away from the first central axis J1 is called the outer side in the first radial direction.
The direction that orbits around the first central axis J1 is called the first orbital direction.

The direction orthogonal to the second central axis J2 is called the second radial direction. Of the second radial directions, the direction closer to the second central axis J2 is called the inner side in the second radial direction, and the direction away from the second central axis J2 is called the outer side in the second radial direction.
The direction that orbits around the second central axis J2 is called the second orbital direction.

As shown in FIG. 2, the camshaft 11 has a shaft shape or a cylindrical shape, and extends in the left-right direction. Although not particularly shown, the camshaft 11 is rotatably supported in the first circumferential direction by a bearing held in the device frame.

The cam 12 is fixed to the outer peripheral portion of the cam shaft 11. The cam 12 is rotated around the first central axis J1 together with the cam shaft 11. As shown in FIG. 3, the cam 12 has a plate shape extending in a direction perpendicular to the first central axis J1. The outer peripheral surfaces of the cam 12 facing outward in the first radial direction have different positions in the first radial direction in each portion in the first circumferential direction. The distance in the first radial direction from the first central axis J1 to the outer peripheral surface of the cam 12 gradually changes toward the first circumferential direction.

A pair of cams 12 are provided at intervals in the left-right direction. The pair of cams 12 are arranged on both sides of the central axis O in the left-right direction with the central axis O interposed therebetween when viewed from the vertical direction. Of the pair of cams 12, one cam 12 located on the right side (+ Y side) of the central axis O is the forward cam 12A, and the other cam located on the left side (-Y side) of the central axis O. Reference numeral 12 is a retracting cam 12B. The forward cam 12A and the backward cam 12B are arranged so that their angular positions, that is, their phases around the first central axis J1 are different from each other. It is preferable that the forward cam 12A and the reverse cam 12B are common products (same members) having the same shape.

The swing shaft 13 has a shaft shape or a cylindrical shape, and extends in the left-right direction. The swing shaft 13 is rotatably supported in the second circumferential direction by a bearing 19 held by a device frame (not shown).

The swinging portion 14 is fixed to the outer peripheral portion of the swinging shaft 13. As shown in FIG. 4C, the swinging portion 14 is swung (rotated) around the second central axis J2 together with the swinging shaft 13 by coming into contact with the cam 12. The swinging portion 14 has a swinging plate 14a and a cam follower 25.

The swing plate 14a is attached to the outer peripheral portion of the swing shaft 13. As shown in FIG. 2, the swing plate 14a has a plate shape extending in a direction perpendicular to the second central axis J2. The swing plate 14a overlaps with the central axis O when viewed from the vertical direction. As shown in FIG. 4 (c), in the present embodiment, the swing plate 14a has a substantially V shape when viewed from the left-right direction. The swing plate 14a has a pair of protrusions 14b arranged apart from each other in the second circumferential direction. Each protruding portion 14b projects outward in the second radial direction.

As shown in FIG. 3, the cam follower 25 is projected from the swing plate 14a in the left-right direction. The cam follower 25 is rotatable around a cam follower axis extending in the left-right direction and is supported by the swing plate 14a. The outer peripheral surface of the cam follower 25 comes into contact with the outer peripheral surface of the cam 12.

A pair of cam followers 25 are provided on the surface of the rocking plate 14a facing the right side (+ Y side) and the surface facing the left side (−Y side). The pair of cam followers 25 are arranged on both sides of the central axis O in the left-right direction with the central axis O interposed therebetween when viewed from the vertical direction. Of the pair of cam followers 25, one cam follower 25 projecting on the surface facing the right side of the rocking plate 14a is a forward cam follower 25A, and the other cam follower 25 projecting on the surface facing the left side of the rocking plate 14a. The cam follower 25 is a retreating cam follower 25B.

As shown in FIG. 4C, the forward cam follower 25A and the backward cam follower 25B are arranged at different positions in the second circumferential direction. The forward cam follower 25A projects to the right from one of the pair of protrusions 14b, which is located on the upper side. The retracting cam follower 25B projects to the left from the lower protruding portion 14b of the pair of protruding portions 14b. Specifically, the forward cam follower 25A is located above a virtual straight line (not shown) passing through the first central axis J1 and the second central axis J2 when viewed from the left-right direction. The retreating cam follower 25B is located below the virtual straight line when viewed from the left-right direction.
The outer peripheral surface of the forward cam follower 25A comes into contact with the outer peripheral surface of the forward cam 12A. The outer peripheral surface of the retracting cam follower 25B comes into contact with the outer peripheral surface of the retracting cam 12B.

As shown in FIGS. 2 and 3, the arm 15 is fixed to the outer peripheral portion of the swing shaft 13. The arm 15 has a plate shape extending in a direction perpendicular to the second central axis J2. The arm 15 projects upward from the swing shaft 13. The arm 15 extends in the vertical direction. The arm 15 is oscillated (rotated) around the second central axis J2 together with the oscillating shaft 13.

The pair of arms 15 are arranged on both sides of the ram shaft 3 in the left-right direction with the ram shaft 3 interposed therebetween (see FIG. 1). The pair of arms 15 are arranged on both sides of the swinging portion 14 in the left-right direction with the swinging portion 14 interposed therebetween. In other words, the ram shaft 3 and the swing portion 14 are located between the pair of arms 15 in the left-right direction. The left-right distance between one of the pair of arms 15 located on the right side and the swing plate 14a, and the left-right distance between the other arm 15 located on the left side and the swing plate 14a. Are the same as each other. That is, the swing portion 14 is arranged at the same distance from the pair of arms 15 in the left-right direction.

As shown in FIG. 4 (c), the upper end portion of the arm 15 is connected to the roller 32b. Specifically, a U-shaped recess that penetrates the arm 15 in the left-right direction and opens upward is formed at the upper end of the arm 15, and a roller 32b is arranged in the recess to be arranged from the front-rear direction. Sandwiched. The arm 15 reciprocates and linearly moves the cup holding mechanism 30 in the front-rear direction via the rollers 32b. That is, the pair of arms 15 swings around the second central axis J2 together with the swing portion 14 and the swing shaft 13 to move the cup holding mechanism 30 back and forth.

Specifically, as shown in FIGS. 4A to 4C, when the cam 12 rotates around the first central axis J1, the outer peripheral surface of the cam 12 from the first central axis J1 in the first radial direction. As the distance to the cam 12 changes along the first circumferential direction, the position of the cam follower 25 in contact with the cam 12 around the second central axis J2 changes, and the swing portion 14, the swing shaft 13, and the pair The arm 15 rotates in the second circumferential direction.

More specifically, when the forward cam 12A rotates in the first circumferential direction from the state shown in FIG. 4A, between the contact portion between the forward cam 12A and the forward cam follower 25A and the first central axis J1. As the distance in the first radial direction gradually increases, the forward cam follower 25A rotates in a predetermined direction around the second central axis J2 (counterclockwise in FIG. 4A). The swing portion 14, the swing shaft 13, and the pair of arms 15 rotate in the predetermined direction around the second central axis J2.
As a result, the pair of arms 15 moves the cup holding mechanism 30 forward toward the front side via each roller 32b in the order shown in FIGS. 4 (b) and 4 (c).

Further, when the retracting cam 12B rotates in the first circumferential direction from the state shown in FIG. 4C, the contact portion between the retracting cam 12B and the retracting cam follower 25B and the first central axis J1 are located. As the distance in one radial direction gradually increases, the retreating cam follower 25B rotates in the direction opposite to the predetermined direction (clockwise in FIG. 4C) around the second central axis J2, and this Along with this, the swing portion 14, the swing shaft 13, and the pair of arms 15 rotate in a direction opposite to the predetermined direction around the second central axis J2.
As a result, as shown in FIG. 4A, the pair of arms 15 moves the cup holding mechanism 30 backward toward the rear side via each roller 32b.

As shown in FIGS. 2 and 3, in this embodiment, each pair of arms 15 has a cover 15a. The cover 15a is detachably provided at the upper end of the arm 15. The cover 15a covers the recess of the arm 15 and the roller 32b from the left-right direction.

As shown in FIG. 2, the gear 20 transmits the rotational driving force around the rotating shaft C of the reciprocating linear motion mechanism 4 to the cup holder driving mechanism 10. A plurality of gears 20 are provided. The plurality of gears 20 include a first gear 21 attached to the reciprocating linear motion mechanism 4, a second gear 22 attached to the cup holder drive mechanism 10, and a third gear 23 that meshes with the first gear 21 and the second gear 22. And have.

The first gear 21 has an annular plate shape centered on the rotation shaft C. The first gear 21 outputs the rotational driving force around the rotation axis C of the reciprocating linear motion mechanism 4 to the outside of the reciprocating linear motion mechanism 4.
The second gear 22 has an annular plate shape centered on the first central axis J1 parallel to the rotation axis C. The second gear 22 is fixed to the left-right end (right end) of the camshaft 11.
The number of teeth of the first gear 21 and the number of teeth of the second gear 22 are the same as each other. As a result, the reciprocating linear motion mechanism 4 and the cup holder drive mechanism 10 can operate in synchronization with each other.

The third gear 23 is arranged between the first gear 21 and the second gear 22. The third gear 23 has an annular plate shape centered on a third gear shaft (not shown) extending in the left-right direction. In the illustrated example, the outer diameter of the third gear 23 is smaller than the outer diameters of the first gear 21 and the second gear 22. The number of teeth of the third gear 23 is smaller than the number of teeth of the first gear 21 and the second gear 22.

As shown in FIG. 1, the dormer 6 is a mold for molding the bottom of the DI can 100. The dormer 6 has a substantially cylindrical shape extending in the front-rear direction. When the punch 2 is arranged at the forward end position in the front-rear direction, the dormer 6 faces the punch 2 in the front-rear direction.

DI processing into the cup-shaped body W by the can forming apparatus 1 of the present embodiment is performed as follows.
First, the cup-shaped body W, which is a work, is arranged between the punch 2 and the redrawing die 8A in a posture in which the cup shaft (can shaft) is extended in the front-rear direction and the opening thereof is directed to the rear side. The bottom wall of the cup-shaped body W faces the end surface 9 of the redraw die 8A.

The cup holder sleeve 31 and the punch 2 of the cup holding mechanism 30 are moved forward with respect to the cup-shaped body W. Then, while the cup holder sleeve 31 presses the bottom wall of the cup-shaped body W against the end surface 9 of the re-drawing die 8A to perform the cup pressing operation, the punch 2 pushes the cup-shaped body W into the through hole 7 of the re-drawing die 8A. By pushing it into the cup-shaped body W, the cup-shaped body W is redrawn.

By the redrawing process, the cup-shaped body W is formed into a small diameter and has a large length in the cup axial direction (that is, in the front-rear direction). Further, the cup-shaped body W is pushed in by the punch 2, and ironing is performed while sequentially passing through the through holes 7 of the plurality of ironing dies 8B. That is, the peripheral wall of the cup-shaped body W is squeezed and stretched to increase the height of the peripheral wall and reduce the thickness of the peripheral wall to form a bottomed cylindrical DI can 100. The DI can 100 is cold-work-hardened by squeezing the peripheral wall, and the strength is increased.

The ironed DI can 100 is pushed forward from the through hole 7 of the die 8 by the punch 2. Then, the bottom of the DI can 100 (the portion that becomes the bottom of the can) is sandwiched and pressed between the punch 2 and the dormer 6, so that the bottom of the DI can 100 is formed into a dome shape.

In the can forming apparatus 1 of the present embodiment described above, since the cup holder drive mechanism 10 has a cam structure, it is easy to synchronize the reciprocating linear motion mechanism 4 for moving the ram shaft 3 back and forth with the cup holder drive mechanism 10. Is. Since the cup holder drive mechanism 10 is arranged directly below the cup holding mechanism 30, the distance between these mechanisms 10 and 30 can be kept short. In order to connect the cup holder drive mechanism 10 and the cup holding mechanism 30, it is not necessary to connect a plurality of shafts continuously between the mechanisms 10 and 30 or to use a joint member or the like as in the conventional case, and the present embodiment is used. For example, the number of parts can be reduced and the manufacturing cost can be reduced. Further, the dimensions of the member connecting the cup holder drive mechanism 10 and the cup holding mechanism 30 can be kept small.

According to the present embodiment, it is possible to suppress the occurrence of loss in the force transmitted from the cup holder drive mechanism 10 to the cup holding mechanism 30. The power for driving the cup holder drive mechanism 10 can be reduced, resulting in energy reduction. Further, it is easy to equalize the load acting on each member connecting the cup holder drive mechanism 10 and the cup holding mechanism 30, and it is possible to suppress the variation in the component life of each member, and as a result, the component. The life can be extended. Since the cup holding mechanism 30 moved back and forth by the cup holder drive mechanism 10 stably presses the cup-shaped body W against the end surface 9 of the die 8, the molding accuracy of the DI can 100 is well maintained. The structure of the can molding apparatus 1 is simplified, and the outer shape can be kept compact.

Further, in the present embodiment, the can forming device 1 includes a gear 20 that transmits the rotational driving force around the rotating shaft C of the reciprocating linear motion mechanism 4 to the cup holder driving mechanism 10.
In this case, the power transmission loss can be suppressed to be smaller than that in the configuration in which the rotational driving force of the reciprocating linear motion mechanism 4 is transmitted to the cup holder driving mechanism 10 via, for example, a belt or the like. In addition, the can molding apparatus 1 can be configured more compactly.

Further, in the present embodiment, the rotation around the first central axis J1 input to the cup holder drive mechanism 10 is converted into the swing around the second central axis J2 by the cam 12 and the swing portion 14, and the pair is paired. It is output from the arm 15. The pair of arms 15 are arranged on both sides of the ram shaft 3 in the left-right direction, and act evenly on the cup holding mechanism 30. As a result, the cup holding mechanism 30 stably presses the cup-shaped body W against the end face 9 of the die 8, and the molding accuracy of the DI can 100 is stably ensured.

Further, in the present embodiment, the cup holding mechanism 30 urges the cup holder sleeve 31 forward by the urging portion 33 by air pressure and elastic restoring force, so that the cup holder sleeve 31 uses the cup-shaped body W as the end surface 9 of the die 8. The pressure (cup holding pressure) pressed against the device stabilizes from the initial stage of operation of the device. Further, unlike the present embodiment, the cup holding pressure can be easily adjusted according to the present embodiment as compared with the case where the cup holder sleeve 31 is urged forward by hydraulic pressure, for example.

Further, in the present embodiment, the cup holder drive mechanism 10 is arranged directly under the bearing 5 (bearing unit 50).
In this case, since the cup holding mechanism 30, the bearing 5, and the cup holder drive mechanism 10 are arranged adjacent to each other in the vertical direction, the can molding device 1 can be configured more compactly.

Further, in the present embodiment, the pair of bearings 5 of the bearing unit 50 are integrally formed.
In this case, the pair of bearings 5, that is, the front bearing 5F and the rear bearing 5R can be easily aligned, and the centering work at the time of assembly or the like can be omitted or simplified. Since the straightness of the ram shaft 3 is maintained well, the molding accuracy of the DI can 100 is stably ensured.

The present invention is not limited to the above-described embodiment, and the configuration can be changed without departing from the spirit of the present invention, for example, as described below.

The cam structure included in the cup holder drive mechanism 10 is not limited to the configuration described in the above-described embodiment. For example, the shape of the cam 12, the arrangement of the cam followers 25, the quantities of the cams 12 and the cam followers 25, the shape of the swing portion 14, and the like may be different from those in the above-described embodiment.

The present invention may be combined with each of the configurations described in the above-described embodiments and modifications, and the configurations can be added, omitted, replaced, or otherwise changed without departing from the spirit of the present invention. .. Further, the present invention is not limited to the above-described embodiments and the like, but is limited only to the scope of claims.

According to the can molding apparatus of the present invention, the loss of force transmitted from the cup holder drive mechanism to the cup holding mechanism can be suppressed to a small extent, and the life of parts can be extended. Therefore, it has industrial applicability.

1 ... Can forming device, 2 ... Punch, 3 ... Ram shaft, 4 ... Reciprocating linear motion mechanism, 5 ... Bearing, 7 ... Through hole, 8 ... Die, 9 ... End face, 10 ... Cup holder drive mechanism, 12 ... Cam, 14 ... swinging part, 15 ... arm, 20 ... gear, 31 ... cup holder sleeve, 32 ... rod, 33 ... urging part, C ... rotating shaft, J1 ... first central shaft, J2 ... second central shaft, W … Cup-shaped

Claims (6)

With the ram axis extending in the front-back direction,
A punch placed at the front end of the ram shaft,
A reciprocating linear motion mechanism connected to the rear end of the ram shaft and reciprocating and linearly moving the ram shaft in the front-rear direction.
With a die having a through hole into which the punch is inserted,
A cup holding mechanism having a cup holder sleeve that presses the cup-shaped body against the end face of the die through which the through hole opens.
A cup holder drive mechanism that swings the cup holding mechanism in the front-rear direction is provided.
The cup holder drive mechanism has a cam structure and is arranged directly below the cup holding mechanism.
Can molding equipment. A gear is provided for transmitting a rotational driving force around the rotation axis of the reciprocating linear motion mechanism to the cup holder driving mechanism.
The can molding apparatus according to claim 1. The cup holder drive mechanism is
A cam rotated around the first central axis extending in the left-right direction orthogonal to the front-back direction,
A swinging portion that swings around a second central axis parallel to the first central axis by coming into contact with the cam.
It has a pair of arms arranged on both sides of the ram shaft in the left-right direction and swinging around the second central axis together with the swinging portion to move the cup holding mechanism back and forth.
The can molding apparatus according to claim 1 or 2. The cup holding mechanism is
With the cup holder sleeve
A pair of rods connected to the pair of arms,
It has an urging portion provided between the cup holder sleeve and the pair of rods and capable of urging the cup holder sleeve forward by air pressure.
The can molding apparatus according to claim 3. A bearing that slidably supports the ram shaft in the front-rear direction is provided.
The cup holder drive mechanism is arranged directly under the bearing.
The can molding apparatus according to any one of claims 1 to 4. A bearing that slidably supports the ram shaft in the front-rear direction is provided.
A pair of the bearings are provided at intervals in the front-rear direction.
The pair of bearings are integrally formed.
The can molding apparatus according to any one of claims 1 to 5.

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