JP2017209729A - Can forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can forming apparatus in which a plurality of can body holding parts formed on a rotating turn table can stably hold a can body over the whole area other than a location which the can body is attached to and detached from.SOLUTION: A fixing ring member has a plurality of split bodies formed in an arc shape and aligned in a circle, and an air supply groove extending in an arc shape is formed on a contact surface of each split body. The air supply groove is formed at at least one place of a connection portion of the split bodies adjacent to each other so as to be communicated with each other. A sliding ring member includes a plurality of sliding side pipes, and one end of each sliding side pipe is connected to an air supply pipe extending from a can body holding part, and the other end is opened at a position where it is superimposed in the air supply groove on the sliding surface.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a can holding mechanism in a can forming 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 formed 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. 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 manufacturing such a bottle can, a bottle necker that is a can forming apparatus used in a necking step rotates a turntable in which a plurality of can body holding portions that support the bottom side of the can body are arranged in an annular shape. Then, the opening end side of the can body held by the can body holding portion is drawn in a stepwise manner by a plurality of necking dies arranged in a ring shape on the die table so as to face each can body holding portion. (For example, refer to 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

  In the container holder shown in Patent Document 2, in order for the can body holding part to hold the can body, it is necessary to always apply gas pressure. When such a container holder is applied to, for example, the slide air valve mechanism of Patent Document 1, since the long groove provided in the fixing member is intermittently formed, one end of a specific gas supply pipe is caused by rotation of the turntable. When passing through a portion where the long groove is not formed, the gas pressure is not applied to the can holding unit to which the gas supply pipe is connected. For this reason, when extracting the can body from the state in which the can body was pressed against the processing mold arranged to face the can holding section, the can body was pulled out of the can holding section and fitted to the processing mold side. There was a risk of problems such as being in a state.

  The present invention has been made in view of the above-described circumstances, and a plurality of can body holding portions formed on a rotating turntable can stably cover the entire region other than the position where the can body is attached and detached. An object of the present invention is to provide a can forming apparatus capable of holding

  In order to solve the above-mentioned problems, a can forming apparatus according to the present invention is a turntable in which a plurality of can body holding portions for removably holding a can body by gas pressure are arranged in an annular shape and rotatable about a rotation axis. An annular sliding ring member that rotates together with the turntable about the rotation axis, and an annular contact surface that is slidably in contact with the sliding surface of the sliding ring member A fixing ring member, wherein the fixing ring member is formed by arranging a plurality of arcuate divided bodies in an annular shape, and on the contact surface of each of the divided bodies, An air supply groove extending in an arc shape is formed, and the air supply groove is formed so as to communicate with each other at at least one of the connecting portions of the divided bodies adjacent to each other, and the sliding ring The member has multiple Each of the sliding side pipes has one end connected to an air supply pipe extending from the can holding part, and the other end opened to a position overlapping the air supply groove on the sliding surface. It is characterized by being.

The can body holding part is a displacement of the can body due to vibration caused by intermittent movement of the turntable, dropping, displacement along the rotation direction of the can body due to rotational molding of a trimmer, screw forming tool, etc., die molding die In order to prevent the displacement of the can body along the axial direction due to, it is necessary to continuously apply the gas pressure, particularly at the can forming position. In the can molding apparatus of the present embodiment, even if the fixing ring member is composed of a plurality of divided bodies for the purpose of improving the maintainability of the fixing ring member or for molding reasons, the divided bodies adjacent to each other By forming the air supply grooves so as to communicate with each other without interruption at the connecting portion, it is possible to continue to apply gas pressure to the can holding part without interruption even when the turntable rotates. Become.
As a result, the can body held by the can body holding portion is stably held by the can body holding portion without being displaced or dropped in the axial direction or the rotational direction due to vibration, and the mold is molded with high accuracy. It becomes possible.

  Further, according to the present invention, each of the divided bodies constituting the fixed ring member includes a fixed side pipe, and one end of each fixed side pipe is connected to the gas supply means, and the other end is the air supply groove. It is characterized by opening on the bottom surface of.

  Further, the present invention provides a position where the can body is inserted and held in the can body holding portion and a position where the can body is pushed out from the can body holding portion of the contact surface of the fixing ring member. In the corresponding region, the air supply groove is not communicated.

  In the present invention, when the contact surface is viewed in plan, the air supply groove includes a C-shaped first air supply groove extending along a virtual circle on the contact surface, and the first air supply groove. A second supply extending along the imaginary circle formed independently of the first supply groove so as to be shorter than the first supply groove between the one end side and the other end side. It consists of air grooves.

  Further, the present invention is characterized in that the can body holding portion holds the bottom side of the can body by an elastic member that expands and contracts by taking gas in and out.

  Moreover, the present invention is characterized in that the fixing ring member is supported by an annular support member that fixes the plurality of divided bodies in an annular shape.

  Further, the present invention is characterized in that the air supply pipes of the can holding parts adjacent to each other are bundled by a binding member.

  Further, the present invention is characterized in that a forming tool for forming the opening end side of the can body is disposed so as to face the can body holding portion via the can body.

  Further, the present invention is inserted in the receiving portion recessed in the thickness direction from the contact surface of the divided body, in the connection portion between the divided bodies adjacent to each other, the air supply groove of one of the divided bodies, It is characterized by comprising a groove adapter in which a communication groove for communicating the air supply groove of the other divided body with each other across the connecting portion is formed.

  Further, the present invention is characterized in that, in the connecting portions between the divided bodies adjacent to each other, each of the divided bodies is bent along the width direction or the thickness direction.

  According to the present invention, there is provided a can forming apparatus in which a plurality of can holding parts formed on a rotating turntable can stably hold a can over an entire region other than a position where the can is attached and detached. Can be provided.

It is the flowchart which showed the manufacturing process of DI 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 a schematic plan view when a fixing ring member is looked down on. It is a top view which shows arrangement | positioning with a fixing ring member and a can body holding | maintenance part. It is a principal part expansion perspective view which shows other embodiment of a fixing ring member. It is a principal part expanded sectional view and principal part expansion perspective view which show other embodiment of a fixing ring member.

  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, the height of the opening end 11a of the can body W2 is not uniform, so the trimming process is performed on the opening end 11a 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 13 (see FIG. 2G) matching the shape of the cap is formed 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.
The can forming device (necking processing device) 20 is a can forming device used in the above-described necking step S7 and screw forming step S8, and a main body 21 provided with a rotation mechanism (not shown) and a reciprocating mechanism (not shown). And a turntable 23 mounted on the main shaft (rotating shaft) 28 of the main body 21 and a die table 24 disposed so as to face the turntable 23. Further, a sliding ring member 25 and a fixing ring member 26 (see FIG. 5) are formed in the vicinity of the center direction of the turntable 23.

  The turntable 23 is composed of, for example, a plurality of can body holding portions 31 arranged in an annular shape on one surface side 23a (see FIG. 5) of a table body 23A having a ring-shaped flat plate. The turntable 23 is supported by an index 27 formed on a frame constituting the main body 21 (see FIG. 6), and rotates intermittently about a main shaft (rotating shaft) 28. The main shaft 28 is rotated by a rotation mechanism (not shown) configured by a motor or the like formed on the main body 21.

  The can body holding portion 31 includes a recess 32 for receiving the lower portion of the can body 10, a holding mechanism 33 formed on the inner peripheral surface of the recess 32, and an extrusion piston 34 formed so as to be linearly movable in the cylinder 39. And. 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 recess 32 so as to narrow the inner shape of the recess 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. In order for the can body holding part 31 to stably hold the can body 10, it is necessary to always apply a certain gas pressure from the air supply pipe 35 to the expandable member 36.

  The push-out piston 34 is formed 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 formed with a pressure adjusting hole (gas vent hole) 58 for releasing 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, the die table 24 includes, for example, a plurality of molding tools, for example, molding dies (on the one side 24a facing the turntable 23, of the table body 24A having a ring-shaped flat plate. .. Are arranged in an annular shape. Further, as a forming tool, a screw tool 61 for forming a thread groove 13 (see FIG. 2G) in the neck portion 12 of the can body W3 is also arranged.

  The die table 24 is attached to one end of a crankshaft (not shown) that passes through the center of the main shaft 28 and reciprocates along the X axis by a reciprocating mechanism (not shown) such as a crank-piston mechanism. It is done. Thereby, the die table 24 is arrange | positioned so that a movement along the X-axis which is a shaping | molding direction of a shaping die is possible. 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 X axis without rotating.

  The molding die (molding tool) 41 is positioned from the position facing the can body insertion position where the neck portion pushes the unmolded can body W3 (see FIG. 2E) into the can body holding portion 31 in the turntable 23. It is composed of a plurality of molding dies 41, 41... Whose shape is changed step by step so that the neck portion 12 is gradually formed along the rotation direction of the turntable 23.

  As shown in FIG. 6, a sliding ring member 25, a fixing ring member 26, and an air chamber ring (tension ring) 53 are formed near the main shaft 28 of the turntable 23. The main body 21 is formed 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 formed inside the air chamber ring bracket 54 and the index mounting flange 55 and 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 formed at a predetermined distance from the fixed ring member 26. The fixing ring member 26 is supported to the air chamber ring 53 via a pressing spring 57 supported by a spring pressing member 56, and is pressed against the sliding ring member 25 by the pressing spring 57. The pressing force (pressing pressure) of the fixing ring member 26 against the sliding ring member 25 can be arbitrarily changed by adjusting the position of the spring pressing member 56.

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. Then, from the sliding side pipe 43 of the fixed ring member 26 whose one end faces the air supply groove 45, the expansion member 36 (see FIG. 4) constituting the holding mechanism 33 of the can body holding part 31 through the air supply pipe 35. Supplied.

  As shown in FIG. 10, a plurality of sliding side pipes 43 are formed inside the sliding ring member 25. In the present embodiment, the number of sliding side pipes 43 corresponding to the number of arranged can body holding portions 31, 31... Is formed at equal intervals along the circumferential direction of the sliding ring member 25. 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, one end side of the sliding side pipe 43 is opened at a position overlapping the air supply groove 45 formed 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 are bundled together.

  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. In the present embodiment, the annular fixed ring member 26 is formed by combining eight divided bodies 46A, 46B, 46C, 46D, 46E, 46F, 46G, and 46H (see FIG. 12). 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...

  As shown in FIG. 11, the fixing ring member 26 composed of the plurality of divided bodies 46, 46... Is supported by a support member (air chamber base metal) 47 on the back surface opposite to the contact surface 26a. That is, the divided bodies 46 </ b> A to 46 </ b> H are each 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 formed 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, an air supply groove 45 extending in an arc shape is formed on each contact surface 26a of the divided bodies 46A to 46H.

  As shown in FIG. 12, the air supply groove 45 includes a C-shaped first air supply groove 45A extending along an imaginary circle R set near the center of the contact surface 26a in the width direction, and a first air supply groove. Independently with respect to the first air supply groove A, the length along the longitudinal direction (the virtual circle R direction) of the first air supply groove 45A is shortened between one end side and the other end side of 45A. The second air supply groove 45 </ b> B extending along the virtual circle R is formed. That is, the air supply groove 45 includes a first air supply groove A and a second air supply groove 45B that do not communicate with each other on the contact surface 26a.

FIG. 13 is a plan view showing the arrangement of the fixing ring member and the can body holding portion when viewed from the main body side.
As shown in FIG. 13, among the can body holding portions 31, 31... Arranged in a ring shape on the turntable 23, the can body holding portion that has reached a position adjacent to the star wheel 51 </ b> A arranged on the outer periphery The can body W3 sent from the previous process is pushed into 31 (can body insertion position P1). Moreover, the can body 10 in which the neck portion 12 is formed is pushed out from the can body holding portion 31 that has reached a position adjacent to the star wheel 51B (can body discharge position P2).
On the virtual circle R of the contact surface 26a of the fixing ring member 26, the second air supply groove 45B is formed at a position corresponding to at least the can body insertion position P1 and the can body discharge position P2.

  On the other hand, the air supply groove 45 is not interrupted in all connection portions except for the connection portion between the divided body 46A and the divided body 46H among the connection parts of the divided bodies 46 and 46 adjacent to each other. It is formed so as to communicate with each other. Thus, the first air supply groove 45A is formed as a continuous long groove even if the formed member is divided into the divided bodies 46A to 46H.

  A fixed side pipe 48 is formed in each of the plurality of divided bodies 46, 46... Constituting the fixed ring member 26 (see FIG. 9). The fixed side pipe 48 is formed so as to penetrate the divided body 46 and the support member 47. The fixed side pipe 48 has one end 48a side connected to a pressure pipe 52 (see FIG. 6) extending from a gas supply means such as a compressor.

  Further, the other end 48 b side of the fixed side pipe 48 opens at the bottom surface 45 a of the air supply groove 45 having a concave cross section. Such a fixed-side pipe 48 may be arranged in the vicinity of the center along the circumferential direction of the arcuate air supply groove 45 in each divided body 46. Compressed air (gas) is supplied from the gas supply means such as a compressor to the first air supply groove 45A via the fixed side pipe 48. On the other hand, the second air supply groove 45B is in an air release state communicating with the outside air. The fixed side pipe 48 communicating with the second air supply groove 45B may be configured to communicate with the intake means.

  The operation of the can molding apparatus 20 of the present embodiment having the above configuration will be described. When the can forming apparatus 20 performs a drawing process on the can body W3 (see FIG. 2 (e)) formed in the previous process to produce a bottle can having the neck portion 12, for example, FIG. The bottom part of the can body W3 is inserted into the recess 32 (see FIG. 4) of the can body holding part 31 at the can body insertion position P1.

  The can body holding part 31 located at the can body insertion position P1 has a second air supply groove 45B in which an opening on the other end side of the sliding side pipe 43 connected to the air supply pipe 35 is formed in the fixed ring member 26. It is in a position overlapping with. Since the second air supply groove 45 </ b> B is released to the atmosphere, the gas pressure is not applied, and the expansion / contraction member 36 constituting the holding mechanism 33 is not bulged from the inner peripheral surface of the recess 32. Therefore, at the can body insertion position P1, the can body W3 is just inserted into the recess 32 of the can body holding portion 31. If the second air supply groove 45 </ b> B is configured to communicate with the intake means via the fixed side pipe 48, the expansion / contraction member 36 constituting the holding mechanism 33 does not bulge from the inner peripheral surface of the recess 32. Can be in a state.

  Next, when the turntable 23 is rotated in the clockwise direction of FIG. 13, for example, the opening on the other end side of the sliding side pipe 43 connected to the can body holding portion 31 into which the can body W3 has been inserted immediately before is shown in FIG. The member 26 moves to a position overlapping the first air supply groove 45A. As a result, the compressed air supplied from the gas supply means can flow along the path of pressure pipe 52 -fixed side pipe 48 -air supply groove 45 (first air supply groove 45A) -slide side pipe 43 -air supply pipe 35. It is supplied to the holding mechanism 33 of the holding unit 31. And the expansion-contraction member 36 swells from the inner peripheral surface of the recessed part 32 by gas pressure, and hold | maintains (grips) the bottom part of the can body W3 stably.

Thus, the can body W3 inserted into the can body holding portion 31 at the can body insertion position P1 is connected to the air supply groove 45 of the fixed ring member 26 and the sliding side pipe 43 of the sliding ring member 25 by the communication of the can body. It is held by the holding mechanism 33 of the holding unit 31. In the can body W3 held by the holding mechanism 33 of the can body holding section 31, the neck portion 12 is gradually formed by the intermittent rotation of the turntable 23 and the movement of the die table 24 along the X axis. Further, the opening end portion 11a side is pressed against a plurality of molding dies (molding tools) 41, 41. Further, the screw tool (former) 61 forms a screw groove 13 (see FIG. 2G) on the tip end side of the can body W3 where the neck portion 12 is formed.
As a result, while the turntable 23 makes one rotation along the clockwise direction of FIG. 13, the can body 10 in which the neck portion 12 is formed in the can body W <b> 3 and the screw groove 13 is further formed is obtained.

  Then, the can body holding part 31 that has reached the can body discharging position P <b> 2 by the rotation of the turntable 23 is moved from the can body holding part 31 by the protrusion of the push-out piston 34 into the recess 32. Extruded and discharged. In such a can body discharge position P <b> 2, the opening on the other end side of the sliding side pipe 43 connected to the air supply pipe 35 is in a position overlapping the second air supply groove 45 </ b> B formed in the fixed ring member 26. Since the second air supply groove 45 </ b> B is released to the atmosphere, the gas pressure is not applied, and the expansion / contraction member 36 constituting the holding mechanism 33 is not bulged from the inner peripheral surface of the recess 32. Therefore, since the can body 10 is not held by the elastic member 36, the can body 10 is easily discharged from the can body holding portion 31 by the protrusion of the push-out piston 34.

  In such a series of molding processes, the can body holding portions 31, 31... Positioned between the can body insertion position P1 and the can body discharge position P2 are moved from the molding dies (molding tools) 41, 41. The held can body W3 is pulled out of the can body holding portions 31, 31,... By the stress applied in the axial direction when extracting W3 and the stress applied in the rotational direction by the screw tool (forming tool) 61. Therefore, it is necessary to continuously apply the gas pressure to the expansion / contraction member 36 of the holding mechanism 33 so as not to rotate.

  In the can molding apparatus 20 of the present embodiment, even if the fixed ring member 26 is composed of a plurality of divided bodies 46A to 46H in order to improve the maintainability, the divided body among the connection parts of the divided bodies 46 and 46 adjacent to each other. By forming the air supply groove 45 so as to communicate with each other without interruption at all connection portions except the connection portion between 46A and the divided body 46H, the can body insertion position P1 and the can body discharge position P2 It is possible to continue to apply gas pressure to the elastic members 36 of all the can holders 31, 31... Located between them without interruption even when the turntable 23 rotates.

  As a result, the can body W3 performing the necking step located between the can body insertion position P1 and the can body discharge position P2 is used when the can body W3 is extracted from the molding dies (molding tools) 41, 41. Also by the stress applied in the axial direction and the stress applied in the rotational direction by the screw tool (forming tool) 61, the held can body W3 comes out of the can body holding portions 31, 31 ..., or the can body W3 rotates. The can body W3 is stably held by the can body holding portion 31, and the neck portion 12 and the thread groove 13 can be formed with high accuracy.

Fig.14 (a) is a perspective view which shows another embodiment of the fixing ring member which comprises a can shaping | molding apparatus, and FIG.14 (b) is sectional drawing of Fig.14 (a).
In this embodiment, the fixing ring member 71 is formed with an air supply groove 72 composed of a long groove having a concave cross section that is dug down in the thickness direction from the contact surface 71a of the divided body 46 in contact with the sliding ring member. And the receiving part 73 dented from the contact surface 71a in the thickness direction is formed in the connection part of the division bodies 46 and 46 which comprise the fixing ring member 71 adjacent to each other. Then, the adapter 76 in which the communication groove 75 is formed is inserted into the receiving portion 73. Accordingly, the communication groove 75 formed in the adapter 76 is arranged so as to straddle the connection boundary between the one divided body 46 and the other divided body 46 adjacent to each other, and one end of the communication groove 75 is one of the divided bodies 46. The other end of the communication groove 75 is connected to the air supply groove 72 of the other divided body 46, respectively.

  The shape of the communication groove 75 may be the same as that of the air supply groove 72. The adapter 76 may be locked to a support member (air chamber base metal) 77 formed on the opposite surface of the contact surface 71a with a screw or the like.

  By forming such an adapter 76, it is possible to more reliably prevent the compressed air from leaking from the boundary between the connecting portions of the plurality of divided bodies 46, 46 constituting the fixing ring member 71. That is, since the air supply groove 72 of one divided body 46 and the air supply groove 72 of the other divided body 46 are connected by the communication groove 75 that seamlessly straddles the connecting portion between the divided bodies 46, 46. It is possible to prevent the compressed air from leaking from the break at the connecting portion between 46 and 46.

FIG. 15 is an essential part enlarged cross-sectional view and an essential part enlarged plan view showing a connecting portion between divided bodies in another embodiment of a fixing ring member constituting the can molding apparatus.
The fixed ring member 81 shown in FIG. 15A has a shape in which the connecting end portions of the divided bodies 82 and 82 are bent along the thickness direction at the connecting portions of the divided bodies 82 and 82 that are in contact with the sliding ring member. Has been. That is, one divided body 82 is cut out by a predetermined length in the upper part along the thickness direction, and the other divided body 82 is cut out by a predetermined length in the lower part along the thickness direction. Yes. And these one and the other division bodies 82 and 82 are engaging in key shape.

  By forming the connecting portion between the divided bodies 82 and 82 of the fixing ring member 81 in such a shape, for example, even when compressed air with high pressure is supplied to the communication groove 83, the connecting portion between the divided bodies 82 and 82 is used. It is possible to more reliably prevent the compressed air from leaking from the boundary.

  The fixed ring member 91 shown in FIG. 15 (b) is bent (refracted) along the width direction at the connection ends of the divided bodies 92 and 92 that are in contact with the sliding ring member. ). That is, one divided body 92 is formed with a convex portion 94a whose central portion projects along the width direction, and the other divided body 92 is formed with a concave portion 94b that receives the convex portion 94a of one divided body 92. Yes.

  Even if high pressure compressed air is supplied to the communication groove 93, for example, by forming the convex portion 94 a and the concave portion 94 b that are engaged with each other at the connection portion between the divided bodies 92, 92 of the fixing ring member 91, It becomes possible to more reliably prevent the compressed air from leaking from the boundary between the connecting portions of the divided bodies 92 and 92.

  The fixing ring member 95 shown in FIG. 15C has a shape in which the connection end portions of the divided bodies 96 and 96 are bent along the width direction at the connecting portions of the divided bodies 96 and 96 that are in contact with the sliding ring member. Has been. That is, one divided body 96 is formed with a convex portion 98a whose central portion along the width direction protrudes in a semicircular shape, and the other divided body 96 receives the semicircular convex portion 98a of one divided body 96. A semicircular recess 98b is formed.

  By forming a semicircular convex portion 98a and a concave portion 98b that engage with each other at the connecting portion between the divided bodies 96, 96 of the fixing ring member 95, for example, high pressure compressed air is supplied to the communication groove 97. However, it is possible to more reliably prevent the compressed air from leaking from the boundary between the connecting portions of the divided bodies 96 and 96.

  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.

  For example, in the above-described embodiment, the molding die 41 and the screw tool 61 are cited as the plurality of molding tools arranged on the die table 24. However, the molding tools attached to the die table are not limited to these, and cans The shaping | molding tool which provides arbitrary shapes to a body can be used, and the kind of shaping | molding tool is not limited.

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 part 45 ... Air supply groove 46 ... Divided body 47 ... Support member

Claims (10)

A plurality of can body holding portions for removably holding the can body by gas pressure are arranged in an annular shape, a turntable that can rotate around a rotation axis, and a circle that rotates with the turntable around the rotation axis A can forming apparatus having an annular sliding ring member and an annular fixed ring member formed with a contact surface slidably contacting a sliding surface of the sliding ring member,
The fixing ring member is formed by arranging a plurality of divided bodies having an arc shape in an annular shape,
An air supply groove extending in an arc shape is formed on the contact surface of each of the divided bodies,
The air supply groove is formed so as to communicate with each other at at least one of the connecting portions of the divided bodies adjacent to each other.
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 having an opening at a position overlapping with an air supply groove.   Each of the divided bodies constituting the fixed ring member includes a fixed side pipe, and each of the fixed side pipes has one end connected to the gas supply means and the other end opened to the bottom surface of the air supply groove. The can molding apparatus according to claim 1, wherein   Of the contact surface of the fixing ring member, in the region corresponding to the position where the can body is inserted and held in the can body holding portion, and the position where the can body is pushed out from the can body holding portion, respectively. The can forming apparatus according to claim 1 or 2, wherein the air supply groove is not communicated.   When the contact surface is viewed in plan, the air supply groove includes a C-shaped first air supply groove extending along a virtual circle on the contact surface, and one end side and the other end side of the first air supply groove. Between the first air supply groove and the second air supply groove extending along the virtual circle so as to be shorter than the first air supply groove. The can molding apparatus according to any one of claims 1 to 3.   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.   6. The can forming apparatus according to claim 1, wherein the fixing ring member is supported by an annular support member that fixes the plurality of divided bodies in an annular shape.   The can forming apparatus according to any one of claims 1 to 6, wherein the air supply pipes of the can holding parts adjacent to each other are bundled by a binding member.   The molding tool for performing molding on the open end side of the can body is disposed so as to face the can body holding portion via the can body. Can forming equipment.   In the connecting portions of the divided bodies adjacent to each other, the insertion portions are inserted into receiving portions recessed in the thickness direction from the contact surfaces of the divided bodies, and the air supply grooves of one of the divided bodies and the other divided body The can forming apparatus according to any one of claims 1 to 8, further comprising a groove adapter in which a communication groove that communicates the air supply groove with each other across the connection portion is formed.   The can according to any one of claims 1 to 8, wherein each of the divided bodies is bent along a width direction or a thickness direction in the connection portion between the divided bodies adjacent to each other. Molding equipment.

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