JP2018001181A - Can molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can molding device capable of preventing a can body from moving in a molding time, while preventing deformation of the can body by a can body holding part, by holding the can body by proper holding power depending on a kind of molding tool.SOLUTION: A contact surface of a fixing ring member is provided with an air supply groove extending along one virtual circle set in the central vicinity in the width direction of the contact surface, and the air supply groove is partitioned into at least three or more of mutually discontinuous sections, and internal pressure of respective divisions of the air supply groove is set in atmospheric pressure communicated with outside air and two or more of mutually different gas pressures higher than the atmospheric pressure, and a sliding ring member comprises a plurality of sliding side pipes, and the respective sliding side pipes are connected to an air supply pipe extending one end from a can body holding part, and opens at the other end in a position overlapping with the virtual circle in a sliding surface.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a compressed gas supply mechanism in a can molding apparatus.

  As a can that is filled and sealed with contents such as beverages, 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, a drawing (drawing) of a metal plate made of aluminum or aluminum alloy into a cup shape (can base material) is redrawn and sidewalls using a can molding device. Is stretched by several stages of ironing. After adjusting the height of the can body thus obtained by trimming, printing is performed on the peripheral surface of the can body. Thereafter, the bottle can is manufactured through a necking step of drawing the opening end side of the can body and a screw forming step of forming a screw groove for attaching a cap on the opening end side of the can body.

  In the manufacture of bottle cans, the bottle necker, which is a can forming device used in the necking process and screw forming process, rotates a turntable with a large number of can body holding parts that support the bottom side of the can body. Let Then, the opening end side of the can body held by the can body holding part is drawn stepwise by a necking mold arranged in a ring shape on the die table so as to face each can body holding part. In addition, a screw groove for forming a cap is formed on the opening end side by a screw forming tool (see, for example, Patent Document 1).

In the slide air valve mechanism described in Patent Document 1, in order to supply the molding gas to the rotating can body holding portion, a fixing member having a plurality of long grooves through which the gas flows is provided. And, by moving one end of the gas supply pipe extending from each can holding part along this long groove as the can holding part rotates, gas can be supplied even if the can holding part rotates. It has a simple structure.
On the other hand, the container holder described in Patent Document 2 discloses a container holder including a container holding body that has a hollow portion that expands when air is supplied and expands due to air pressure to hold the container. .

US Pat. No. 8,627,705 Japanese Patent No. 5049564

  Conventionally, the gas pressure of the compressed gas applied to the can holding unit to hold the can body is a constant gas pressure higher than the atmospheric pressure applied when processing the can body and the atmospheric pressure when inserting and removing the can body. Two steps were common. On the other hand, in the can body processing, the can surface is processed during the peripheral surface processing by the rotary processing tool in which stress is applied along the circumferential direction of the can body, rather than during the mold forming in which stress is applied along the height direction of the can body. There existed a subject that the can body in process hold | maintained at the body holding part moved easily. However, if the overall gas pressure applied to the can body holding part is set to such an extent that the movement of the can body can be suppressed at the time of peripheral surface processing by a rotary processing tool, the There was a possibility that the peripheral surface of the can body could be deformed by a strong holding force applied from the body holding portion.

  This invention was made in view of the circumstances described above, and depending on the type of molding tool, holding the can body with an appropriate holding force, while preventing deformation of the can body by the can body holding portion, An object of the present invention is to provide a can forming apparatus capable of preventing the can body from moving during forming.

  In order to solve the above-mentioned problems, the can molding apparatus of the present invention is formed by arranging a large number of can body holding portions for removably holding a can body by gas pressure on one side in an annular shape, and rotates around a central axis. A turntable that is movable, and a die that is provided opposite to the turntable and that is formed in an annular arrangement on one side to form a can body, and that can reciprocate along the axial direction of the central axis An annular fixing provided with a table, an annular sliding ring member that rotates together with the turntable around the central axis, and a contact surface that slidably contacts the sliding surface of the sliding ring member A ring forming member, wherein the contact surface of the fixed ring member is provided with an air supply groove extending along one imaginary circle set on the contact surface, It is divided into at least 3 or more sections that are discontinuous with each other The internal pressure of each section of the air supply groove is set to an atmospheric pressure communicating with the outside air and two or more different gas pressures higher than the atmospheric pressure, and the sliding ring member includes a plurality of sliding sides Each of the sliding side pipes is provided with a pipe, one end of which is connected to an air supply pipe extending from the can holding part, and the other end is opened at a position overlapping the virtual circle on the sliding surface. Features.

  According to the can molding apparatus of the embodiment, the gas pressure of the compressed gas for holding the can body in the corresponding can body holder can be changed according to the type of the molding tool. A can tool that supports a can that is subjected to a large stress on the can body is supplied with a compressed gas with a high gas pressure that can exert a large holding force on the can body, and the can body that is being processed is difficult to move. A can body holder corresponding to the above is supplied with a compressed gas having a low gas pressure to prevent deformation of the can body due to the holding force of the can body holder. Thereby, the can body can be realized that can hold the can body with an appropriate holding force and prevent the can body from moving during molding while preventing the can body from being deformed by the can body holding portion.

  The molding tool includes a molding die that presses a molding surface along the height direction of the can body, and a rotation processing tool that rotates along the circumferential surface direction of the can body to process the circumferential surface of the can body. The air supply groove is at a position corresponding to the rotary processing tool and a first section overlapping with the other end of the air supply pipe extending from the can body holding portion at a position corresponding to the molding die. A second section overlapping with the other end of the air supply pipe extending from the can body holding section; and the other end of the air supply pipe extending from the can body holding section at a position for inserting and removing the can body from the can body holding section. And a third section that overlaps and communicates with outside air.

  As a result, a rotating tool that allows the can body to move during processing by applying rotational stress to the can body, and molding that applies stress only in the height direction of the can body during processing and prevents the can body from moving during processing. It is possible to change the gas pressure of the compressed gas applied to the can body holding portion between the mold and the can body insertion / removal position that does not require the can body holding force to be generated in the can body holding portion.

  The gas pressure in the second section is set to be higher than the gas pressure in the first section.

  The gas pressure in the second compartment is set to be at least 1.5 times higher than the gas pressure in the first compartment.

  The can body holding portion is characterized in that the bottom side of the can body is held by an expansion / contraction member that expands and contracts when gas is taken in and out.

  According to the present invention, the can body can be held with an appropriate holding force according to the type of the forming tool, and the can body can be prevented from moving during molding while preventing the can body from being deformed by the can body holding portion. It is possible to provide a can forming apparatus capable of performing

It is the flowchart which showed the manufacturing process of the 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 (necking processing apparatus). It is an external appearance perspective view which shows a can body holding | maintenance part and its peripheral part. It is a principal part expansion perspective view which shows a part of turntable. It is a principal part expansion perspective view which shows the attachment part of a turntable and a main-body part. It is a principal part expansion perspective view which shows a part of turntable. It is a principal part expansion perspective view which shows the principal part of a turntable. It is a principal part expanded sectional view which shows the contact part of a sliding ring member and a fixed ring member. It is a partially broken perspective view which shows a sliding ring member. It is a partially broken perspective view which shows a fixing ring member and a supporting member. It is the schematic diagram which showed the positional relationship of the fixing ring member and die table in a compressed gas introduction path | route.

  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 blanking process S1, the cupping process (drawing process) S2, the DI process (drawing and ironing process) S3, the trimming process S4, the printing / painting (can outer surface) process S5, the painting (can inner surface) process S6, the necking process The can is manufactured through S7 and the screw forming step S8 in this order.

  In the plate material punching step S1, for example, a rolled material made of an aluminum alloy material is punched, and a disk-shaped plate material (blank) W as shown in FIG. 2A 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 DI step (drawing and squeezing step) S3, as shown in FIG. 2 (c), DI processing (re-drawing and squeezing processing) is performed on the cup-shaped body W1 by a DI processing device, and the can body 11 and the bottom 14 Is formed into a bottomed cylindrical can body W2.

  In the trimming step S4, since the height of the opening end 11a of the can body W2 is not uniform, the trimming of the opening end 11a is performed using a trimming device, and the can body as shown in FIG. The can body W3 after the trimming process in which the heights of the 11 open end portions 11a are evenly aligned over the entire circumference is formed.

  Thereafter, the can body W3 is washed to remove the lubricating oil and the like, and then subjected to a surface treatment and dried. Then, as shown in FIG. 2 (e), printing and coating of the outer surface side 11b of the can body W3 are performed. (Printing / painting (can outer surface) step S5), and then the inner surface 11c of the can body W3 is coated (painting (can inner surface) step S6).

  Next, a neck portion 12 having a constricted shape so as to be smoothly inclined is formed on the opening end portion 11a side of the can body 11 using a necking die (forming tool) (necking step S7). Furthermore, a screw groove (see FIG. 2 (g)) that matches the shape of the cap is provided in the neck portion 12 at the opening end portion of the neck portion 12 using a screw tool (forming tool) (screw forming step S8). ). The can forming apparatus according to the present embodiment is a necking processing apparatus used in such a necking step S7 and a screw forming step S8. In this way, a can body (bottle can) 10 having a constricted neck portion 12 on the open end 11a side of the can body 11 is manufactured (see FIG. 2F).

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

FIG. 3 is an external perspective view showing a can forming apparatus (necking apparatus) according to an embodiment of the present invention. FIG. 4 is an external perspective view showing the can body holding portion and the peripheral portion thereof. FIG. 5 is an enlarged perspective view of a main part showing a part of the turntable. FIG. 6 is an enlarged perspective view of a main part showing a mounting portion between the turntable and the main body. FIG. 7 is an enlarged perspective view of a main part showing a part of the turntable.
A can forming device (necking processing device) 20 of the present embodiment is a can forming device used in the above-described necking step S7 and screw forming step S8, and includes a rotation mechanism (not shown) and a reciprocating mechanism (not shown). The main body 21, a turntable 23 that rotates about a central axis C passing through the main shaft 28 of the main body 21, and a die table 24 that is disposed to face the turntable 23. A sliding ring member 25 and a fixing ring member 26 (see FIG. 5) are provided in the vicinity of the center direction of the turntable 23.

  The turntable 23 is formed by, for example, a large number of can body holding portions 31, 31... Arranged in an annular shape on one surface side 23a (see FIG. 5) of a table main body 23A having a ring-shaped flat plate. The turntable 23 is supported by an index 27 provided on a frame constituting the main body 21 (see FIG. 6) and rotates intermittently around the central axis C.

  Of the large number of can body holding portions 31, 31... Arranged on the rotating turntable 23, adjacent to the can body holding portion 31 at the can body insertion position P1 where the can body W3 before necking molding is inserted. A star wheel 51A is provided. The star wheel 51A rotates while holding the can body on the peripheral surface side, and conveys the can body W3 before molding toward the can body holding portion 31 at the can body insertion position P1.

  In addition, among the large number of can body holding portions 31, 31..., A star wheel 51B is provided adjacent to the can body holding portion 31 at the can body discharge position P2 from which the formed can body 10 is discharged. . The star wheel 51B receives the molded can body 10 discharged from the can body holding portion 31 at the can body discharge position P2, holds the can body 10 on the circumferential surface side, rotates, and transports it to the next process. To do.

  The can body holding portion 31 includes a recess 32 into which the lower portion of the can body 10 is inserted, a holding mechanism 33 provided on the inner peripheral surface of the recess 32, and an extrusion provided to be movable linearly in the cylinder 39. And a piston 34. When a gas pressure is applied to the holding mechanism 33 by, for example, sending compressed air from the air supply pipe 35, the elastic member 36 such as rubber bulges from the inner peripheral surface of the concave portion 32 and narrows the inner diameter of the concave portion 32.

  Thereby, the bottom part of the can body 10 inserted in the recessed part 32 is clamped by the expansion-contraction member 36, and the can body 10 is stably hold | maintained at the can body holding part 31. FIG. As will be described in detail later, the gas pressure applied to the elastic member 36 of the can body holding part 31 can be changed depending on the processing position in the turntable 23 of the can body W3.

  The push-out piston 34 is provided so as to be movable along the X axis, which is the insertion / removal direction of the can body 10, and after reducing the gas pressure applied to the expansion / contraction member 36, compressed air is supplied from the opening 39 a on the rear end side of the cylinder 39. The can body 10 is discharged from the can body holding portion 31 by projecting the extrusion piston 34 into the recess 32. The cylinder 39 is provided with a pressure adjusting hole (gas vent hole) 58 in order to release the air compressed in the cylinder 39 by the movement of the pushing piston 34. For example, the pressure adjusting hole 58 may be a through hole that allows the inside and the outside of the cylinder 39 to communicate with each other.

  Referring to FIG. 3 again, in the die table 24, a large number of forming tools 40 are arranged in an annular shape on one surface side 24a facing the turntable 23 of the table body 24A having, for example, a ring-shaped flat plate. ing. As the molding tool 40, molding dies 41, 41... For molding the neck portion 12 (see FIG. 2 (f)) of the can body W3, trimming processing, screw forming processing on the peripheral surface of the can body W3, It includes a rotary processing tool 61 for performing rotary processing such as curl processing and throttle (curl caulking) processing.

  For example, the die table 24 passes through the center of the main shaft 28 and is a crankshaft (not shown) that reciprocates along the extending direction of the central axis C by a reciprocating mechanism (not shown) such as a crank-piston mechanism. Attached to one end. Thereby, the die table 24 is disposed so as to be movable along the central axis C which is the molding direction of the molding dies 41, 41. That is, the die table 24 reciprocates so as to narrow or widen the distance from the turntable 23. The die table 24 only reciprocates along the central axis C without rotating.

  Of the molding tool 40, the molding dies 41, 41... Are in the can body insertion position where the neck portion is pushed into the can body holding portion 31 of the turntable 23 and the can body W3 (see FIG. 2 (e)) is pushed. From the opposite position, the mold forming surface is changed step by step so that the neck portion 12 is gradually formed along the rotation direction of the turntable 23. Then, by reciprocating the die table 24 along the central axis C, the opening end side of the can body W3 is sequentially pressed against a plurality of molding dies 41, 41. The neck portion 12 is formed on the can body W3 (die processing). During die processing using such molding dies 41, 41..., Stress along the height direction (axial direction) of the can body W3 is applied to the expandable member 36 of the holding mechanism 33.

  On the other hand, in the forming tool 40, the rotary processing tool 61 has a processing jig rotated outside the peripheral surface of the can body W3 by a spindle motor, for example, and trimming processing, screw forming processing, curling processing on the peripheral surface of the can body W3. Rotating processing such as throttle (curl caulking) processing is performed. At the time of rotational processing by the rotational processing tool 61, stress along the circumferential direction of the can body W3 is applied to the elastic member 36 of the holding mechanism 33.

  As shown in FIG. 6, a slide ring member 25, a fixed ring member 26, and an air chamber ring (tension ring) 53 are provided near the main shaft 28 of the turntable 23. The main body 21 is provided with an index 27, an air chamber ring bracket 54, and an index mounting flange 55. The turntable 23 is supported by the index 27 and is rotated intermittently.

  A pressure pipe 52 is provided inside the air chamber ring bracket 54 and the index mounting flange 55 and is connected to a fixed side pipe 48 described later. The end of the pressure pipe 52 on the index mounting flange 55 side is connected to a compressed air supply source, for example, a compressor (not shown). With such a configuration, the compressed air flows from the main body portion 21 to the front surface side of the turntable 23 via the air chamber ring bracket 54 and is supplied to the fixed ring member 26 from the air chamber ring (tension ring) 53 side.

  As shown in FIG. 7, the air chamber ring (tension ring) 53 is attached to the air chamber ring bracket 54 and is provided at a predetermined interval with respect to the fixed ring member 26. The fixing ring member 26 is supported to the air chamber ring 53 via a pressing spring 57 inserted into the center pin 56, and is pressed against the sliding ring member 25 by the pressing spring 57.

FIG. 8 is an enlarged perspective view of a main part in which a part of FIG. 5 is enlarged. FIG. 9 is a schematic cross-sectional view including contact portions of the sliding ring member and the fixed ring member.
The sliding ring member 25 is formed of an annular member having a rectangular cross section, and rotates with the turntable 23 coaxially with the turntable 23. The sliding ring member 25 is slidably adhered to the contact surface 26a of the fixed ring member 26 at the sliding surface 25a (see FIG. 9).

  The compressed air supplied from the gas supply means is supplied from the pressure pipe 52 to the air supply groove 45 through the fixed side pipe 48 of the fixed ring member 26. And the elastic member 36 which comprises the holding mechanism 33 of the can holding | maintenance part 31 via the air supply pipe 35 from the sliding side piping 43 of the sliding ring member 25 in which one end faces this air supply groove 45 (refer FIG. 4). To be supplied.

  As shown in FIG. 10, a large number of sliding side pipes 43 are provided inside the sliding ring member 25. In the present embodiment, the number of sliding side pipes 43 corresponding to the number of arranged can holders 31, 31... Is provided along the circumferential direction of the sliding ring member 25, for example, at equal intervals. Each sliding side pipe 43 has a shape refracted into an L shape inside the sliding ring member 25. Each sliding side pipe 43 is connected to an air supply pipe 35 extending at one end side from each of the can body holding portions 31, 31. Further, the other end side of the sliding side pipe 43 is opened at a position overlapping the air supply groove 45 provided in the fixed ring member 26 on the sliding surface 25a.

  The air supply pipe 35 connecting the can body holding part 31 and one end side of the sliding side pipe 43 is bundled so that the air supply pipes 35 of the adjacent can body holding parts 31 form a pair. The members 49 may be bundled.

  The fixed ring member 26 is fixed at a fixed position without rotating, and allows the sliding ring member 25 to slide on the contact surface 26a with respect to the sliding ring member 25 that rotates together with the turntable 23. And it touches so that airtightness is maintained.

  The fixing ring member 26 is an annular member having a rectangular cross section as a whole, and is composed of a plurality of divided bodies 46, 46... Each having an arc shape. An annular fixing ring member 26 is formed by combining the plurality of divided bodies 46. Since the fixing ring member 26 is in contact with the sliding ring member 25 at all times when the turntable 23 is rotated, the fixing ring member 26 is divided into a plurality of divided bodies in order to improve maintenance such as replacement due to wear. 46, 46...

  Further, as shown in FIG. 11, the fixing ring member 26 including the plurality of divided bodies 46, 46... Is supported by a support member (air chamber base metal) 47 on the side opposite to the contact surface 26 a. That is, the divided bodies 46, 46... Are fixed to an annular shape by being screwed to the support member 47, thereby forming the fixed ring member 26. The support member (air chamber base metal) 47 is formed by combining two semicircular members, for example, and is supported by the air chamber ring 53 (see FIG. 7) at a predetermined interval. ing. The fixing ring member 26 is made of an engineering plastic having excellent wear resistance and durability, such as polyacetal, polyamide, polycarbonate, polybutylene terephthalate, and fluororesin.

  The fixing ring member 26 is provided with an air supply groove 45 formed of a long groove having a concave cross section that is dug down in the thickness direction from the contact surface 26a (see FIG. 9). That is, the air supply groove 45 is provided in each contact surface 26a of the divided bodies 46, 46.

FIG. 12 is a schematic diagram showing the positional relationship between the fixed ring member and the die table in the compressed gas introduction path.
As shown in FIG. 12, the air supply groove 45 of the present embodiment extends along one virtual circle R set near the center of the contact surface 26a in the width direction, for example. The air supply groove 45 is divided into three non-continuous sections including a first air supply groove 45A, a second air supply groove 45B, and a third air supply groove 45C. That is, a substantially C-shaped first air supply groove 45A extending along one virtual circle R set near the center in the width direction of the contact surface 26a, one end side and the other end side of the first air supply groove 45A Between the second air supply groove 45B and the third air supply groove 45C which are curved along the virtual circle R.

  The air supply groove 45 includes a first air supply groove 45A, a second air supply groove 45B, and a third air supply groove 45C that are discontinuous with each other and extend along one virtual circle R. The internal pressures of the first air supply groove 45A, the second air supply groove 45B, and the third air supply groove 45C are made different from each other during molding of the can body.

FIG. 12 is a schematic diagram showing a positional relationship between the die table and the fixing ring member.
The die table 24 is provided with a large number of molding tools 40 along the circumferential direction. The molding tool 40 includes a plurality of molding dies 41, 41... And a plurality of rotary processing tools 61. ing. Among these, the molding dies 41, 41... Are arbitrary positions after the position corresponding to the can body holding portion 31 (see FIG. 5) at the can body insertion position P1 in the turntable 23, for example, lubrication. From the next position of the oil applicator (not shown), it is arranged in a section (molding mold arrangement section E1) of about 3/4 counterclockwise along the circumferential direction of the turntable 23.

  On the other hand, the rotary processing tools 61, 61... Follow the molding die arrangement section E1 and follow the circumferential direction of the turntable 23 to the position corresponding to the can body discharge position P2 counterclockwise. In the section (rotation processing tool array section E2). Note that nothing is provided in the section (can body insertion / removal section E3) from the can body discharge position P2 to a position corresponding to the can body insertion position P1.

  The air supply groove 45 is connected to a compressed gas source 71 via a fixed side pipe 48 and a pressure pipe 52 (see also FIG. 6). The compressed gas source 71 is composed of a unit capable of supplying compressed gas, such as a compressor or a compressed gas cylinder. In addition, as compressed gas, compressed air, compressed nitrogen gas, etc. are mentioned, for example, The kind of gas is not limited.

  Of the air supply groove 45, the compressed gas whose gas pressure is adjusted is supplied from the pressure pipe 52a via the pressure regulator 72A to the first air supply groove 45A corresponding to the molding die arrangement section E1. On the other hand, compressed gas is supplied from the compressed gas source 71 through the pressure regulator 72B and the pressure pipe 52b to the second supply groove 45B corresponding to the rotary machining tool arrangement section E2 in the supply groove 45. Further, the third air supply groove 45C corresponding to the can insertion / removal section E3 is released to the outside air At and is set to atmospheric pressure.

The supply gas pressure of the compressed gas source 71 is set to about 0.7 MPa, for example. On the other hand, the pressure regulator 72A adjusts the gas pressure of the input compressed gas so that it is lower than the supply gas pressure of the compressed gas source 71, for example, about 0.3 MPa. Further, the pressure regulator 72B makes the gas pressure of the input compressed gas lower than the supply gas pressure of the compressed gas source 71 and higher than the supply gas pressure via the pressure regulator 72A, for example, about 0.5 MPa. Adjust the pressure so that
Thereby, the gas pressure of the second air supply groove 45B to which the compressed gas regulated from the compressed gas source 71 via the pressure regulator 72B is supplied is set to about 0.5 MPa, for example. On the other hand, the gas pressure in the first air supply groove 45A to which the compressed gas regulated from the compressed gas source 71 via the pressure regulator 72A is supplied is lower than that in the second air supply groove 45B, for example, 0.3 MPa. To a degree. Note that the third air supply groove 45C released to the atmosphere is, for example, about 1013 hPa (standard atmospheric pressure).

  In the first air supply groove 45A, of the sliding ring member 25 (see FIG. 10) in contact with the fixed ring member 26, on the other end side of the sliding side pipe 43 located at the position corresponding to the molding die arrangement section E1. The open end is exposed. That is, in the first air supply groove 45A, a slide connected to an air supply pipe 35 (see FIG. 7) extending from the can holding part 31 at a position facing the molding dies 41, 41. The other end side of the side pipe 43 is open.

  On the other hand, in the second air supply groove 45B, an opening end on the other end side of the sliding side pipe 43 located at a position corresponding to the rotary machining tool arrangement section E2 in the sliding ring member 25 in contact with the fixed ring member 26 is provided. Exposed. That is, in the second air supply groove 45B, in addition to the sliding side pipe 43 connected to the air supply pipe 35 extending from the can body holding portion 31 at a position facing the rotary processing tools 61, 61. The end side is open.

  Due to the structure of the fixing ring member 26, the can body holding portions 31, 31... Located at positions facing the molding dies 41, 41... Are reduced from the compressed gas source 71 through the pressure regulator 72A. A compressed gas having a gas pressure, for example, a gas pressure of about 0.3 MPa is supplied. Moreover, with respect to the can holding | maintenance part 31,31 ... in the position facing rotary processing tool 61,61 ..., the high gas pressure decompressed from the compressed gas source 71 via the pressure regulator 72B, for example, 0.5 MPa A compressed gas having a gas pressure of about a level is supplied.

  The operation of the can molding apparatus 20 of the present embodiment having the above configuration will be described. For example, when a bottle can provided with the neck portion 12 is manufactured by performing a drawing process or the like on the can body W3 (see FIG. 2 (e)) formed in the previous process by the can molding device 20, the can The bottom of the can body W3 is inserted into the concave portion 32 (see FIG. 4) of the body holding portion 31, and compressed air is introduced into the holding mechanism 33 to hold the can body W3. The neck portion 12 and the screw groove 13 are formed on the can body W3 by the forming tool 40 such as the processing tool 61.

  The compressed air introduced into the holding mechanism 33 of the can holding unit 31 is sent from an air supply groove 45 provided in the fixed ring member 26 through a sliding ring member 25 that rotates together with the turntable 23. In the present embodiment, the air supply groove 45 is divided into three non-continuous sections including the first air supply groove 45A, the second air supply groove 45B, and the third air supply groove 45C. And the gas pressure of the 2nd supply groove 45B which supplies compressed gas toward the can body holding | maintenance part 31,31 ... which opposes the rotational processing tools 61,61 ... is a can which opposes the shaping | molding metal molds 41,41 .... It is comprised so that it may become higher than 45 A of 1st air supply grooves which supply compressed gas toward the body holding parts 31,31 ....

  With such a configuration, stress is applied along the circumferential direction of the can body W3 during processing, and the can body W3 held by the can body holding portions 31, 31... Faces the rotary processing tools 61, 61. The gas pressure supplied to the can holders 31, 31... Can be selectively increased, and the rotating can tool 61 can reliably prevent the can body W3 being processed from moving.

  Further, the gas pressure supplied to the can body holding portions 31, 31... Facing the molding dies 41, 41... Holding the can body W3 in a state where the neck portion 12 is not completely formed is selectively lowered. , The can body W3 can be reliably prevented from being deformed by the holding force of the can body holding portions 31, 31.

  In addition, the structure of the can shaping | molding apparatus 20 mentioned above is an example, and various omission, replacement, and a change can be performed. For example, in the can molding apparatus 20 described above, the supply gas pressure of the compressed gas source 71 is regulated via the pressure regulators 72A and 72B, but other than this, for example, it corresponds to the rotary machining tool arrangement section E2. The gas pressure of one of the compressed gas supplied to the second air supply groove 45B and the compressed gas supplied to the first air supply groove 45A corresponding to the molding die arrangement section E1 is supplied via a pressure regulator. It may be configured to be lowered. Further, the pressure of the compressed gas source 71 is set to be the same as the gas pressure supplied to the first air supply groove 45A, and the gas pressure supplied to the second air supply groove 45B is set via, for example, a booster. It may be configured to increase the

  Further, for example, a compressed gas source that supplies compressed gas to the first air supply groove 45A and the second air supply groove 45B is provided independently, and a compressed gas source that supplies compressed gas to the second air supply groove 45B is supplied. The gas pressure may be higher than the supply gas pressure of the compressed gas source that supplies the compressed gas to the first supply groove 45A.

  In the above-described embodiment, the second air supply groove 45B corresponding to the rotary machining tool array section E2 is provided on the rear stage side of the first air supply groove 45A corresponding to the molding die array section E1. The formation positions of the first air supply groove 45A, the second air supply groove 45B, and the third air supply groove 45C released to the atmosphere on the fixed ring member 26 are the molding die 41 and the rotary processing tool 61 in the die table 23. Depending on the arrangement, it can be appropriately selected. For example, when the die 41 and the rotary machining tool 61 are mixedly arranged on the die table 23, the first air supply groove 45A and the second air supply groove 45B are also alternately mixed correspondingly. You can do it.

  Further, in the above-described embodiment, the type of the molding tool 40 is divided into two types, that is, the molding die 41 and the rotary processing tool 61, and the compressed gas supplied to the can holders 31, 31. Is divided into three or more types, and the compressed gas supplied to the can holders 31, 31,... This can be done. In this case, the compressed gas supplied from the compressed gas source can be realized by using a plurality of pressure regulators having different decompression rates.

  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 (necking equipment)
DESCRIPTION OF SYMBOLS 21 ... Main-body part 23 ... Turntable 24 ... Die table 25 ... Sliding ring member 26 ... Fixed ring member 31 ... Can body holding | maintenance part 45 ... Air supply groove 45A ... 1st air supply groove 45B ... 2nd air supply groove 45C ... Third air supply groove 72A, 72B ... pressure regulator

Claims (5)

A large number of can body holding portions for removably holding the can body by gas pressure are arranged in an annular shape on one side, and are provided facing a turntable that can rotate around a central axis. , A forming tool for forming a can body is arranged in an annular shape on one side, a die table that can reciprocate along the axial direction of the central axis, and an annular shape that rotates together with the turntable around the central axis A can forming apparatus, and an annular fixed ring member provided with a contact surface slidably contacting a sliding surface of the sliding ring member,
The contact surface of the fixing ring member is provided with an air supply groove extending along one virtual circle set on the contact surface,
The air supply groove is divided into at least three sections that are discontinuous with each other,
The internal pressure of each section of the air supply groove is set to an atmospheric pressure communicating with the outside air, and two or more different gas pressures higher than the atmospheric pressure,
The sliding ring member includes a plurality of sliding side pipes, and each of the sliding side pipes is connected to an air supply pipe having one end extending from the can body holding portion, and the other end of the sliding surface. A can forming apparatus characterized by being opened at a position overlapping a virtual circle. The molding tool includes a molding die that presses a molding surface along the height direction of the can body, and a rotation processing tool that rotates along the circumferential surface direction of the can body to process the circumferential surface of the can body. At least,
The air supply groove has a first section that overlaps with the other end of the air supply pipe extending from the can body holding portion at a position corresponding to the molding die, and the can body holding at a position corresponding to the rotary processing tool. A second section that overlaps with the other end of the air supply pipe extending from the portion, and the other end of the air supply pipe extending from the can body holding portion at a position for inserting and removing the can body from the can body holding portion, and communicates with the outside air The can forming apparatus according to claim 1, further comprising a third section.   The can forming apparatus according to claim 2, wherein the gas pressure in the second section is set to be higher than the gas pressure in the first section.   The can molding apparatus according to claim 3, wherein the gas pressure in the second section is set to be at least 1.5 times higher than the gas pressure in the first section.   The can forming apparatus according to any one of claims 1 to 4, wherein the can holding unit holds the bottom side of the can by an expansion / contraction member that expands and contracts when gas is taken in and out.

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