JP4644416B2 - Method and apparatus for external processing of can body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer shape processing method and apparatus for improving the design of a can body by recessing and deforming a desired position of the can body into a three-dimensional pattern.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it has been known that a can body having contents such as beverages and foods is subjected to external processing for forming a three-dimensional pattern by recessing and deforming the can body in order to improve the design of the can body.
[0003]
When performing this type of outer shape processing, for example, first, a pair of receiving molds are inserted into the inside of a cylindrical can body from the openings on both sides of the can body, and the opposing widths between the front ends of the pair of receiving molds Thus, a molded part corresponding to the recessed shape is formed. On the other hand, from the outer surface side of the can body, the pressure roller is pressed at a position corresponding to the molding part. Then, the can body is rotated while maintaining the pressure contact by the pressing roller, and thereby the can body is indented and deformed over the entire circumference.
[0004]
However, in the case where the pressing roller and the receiving die are deformed to be recessed, the thickness of the recessed portion becomes thin due to the squeezing deformation of the pressing roller and the receiving die, and there is a disadvantage that the strength of the can body is lowered.
[0005]
In addition, when this type of external processing is performed by inserting a receiving mold into the can body, the inner surface of the can body may be damaged because the receiving mold is in sliding contact with the inner surface of the can body. If the inner surface of the can body is subjected to a coating treatment such as painting, the coating may be damaged. Further, the use of the receiving mold may leave the shape of the receiving mold, which may reduce the beauty of the three-dimensional pattern.
[0006]
Furthermore, when a can lid is wound around one of the can bodies, or when it is integrally formed into a bottomed cylindrical shape like a so-called two-piece can body, it can only be opened from the opening on one side of the can body. There is an inconvenience that the receiving mold cannot be inserted and a desired recessed shape cannot be obtained.
[0007]
In addition, since it is necessary to accurately correspond the positions of the pressing roller and the receiving mold, the configuration of the apparatus becomes complicated, and the apparatus becomes expensive, resulting in an increase in manufacturing cost.
[0008]
Therefore, as another conventional technique, the can body is accommodated in an outer mold having a three-dimensional pattern formed on the inner surface side, and a molding head having a rubber inflatable portion that is expandable in the outer peripheral direction is inserted into the can body. Furthermore, a method is known in which the expansion portion is expanded by water pressure and the can body is pressed against the inner surface of the outer mold to form a three-dimensional pattern on the outer surface of the outer mold on the outer surface of the can cylinder (see Patent Document 1). According to this, since it is a rubber-made expansion part that contacts the inner surface of the can body, it is possible to prevent damage to the inner surface of the can body.
[0009]
However, according to this, since the can body is inflated by the expansion of the inflating portion to form irregularities on the can body, there is a disadvantage that the outer shape reduction of the can body cannot be performed. In addition, the molding head requires a complicated structure such as a flow path for supplying water to the inflating part as well as the inflating part. It is necessary to inflate the can body so that the apparatus becomes expensive and the manufacturing cost increases. Further, in order to deform the can body by pressing from the inner surface of the can body by the rubber inflatable portion, for example, even if an attempt is made to form a plurality of recesses relatively close to the outer surface of the can body, the outer surface of the can body Has a disadvantage that the recess is not sufficiently formed.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-10873
[0011]
[Problems to be solved by the invention]
By eliminating such inconveniences, the present invention prevents the strength of the can body from being lowered and also reliably prevents damage to the inner surface of the can body and damage to the coating, and even if the can body is closed on one side. An object of the present invention is to provide a can body outer shape processing method and apparatus that can easily perform outer shape processing, and can easily perform outer shape processing with high design at low cost without complicating the device configuration. To do.
[0012]
[Means for Solving the Problems]
In order to achieve such an object, the present invention achieves such an object, and in order to achieve such an object, the present invention provides a method for externally processing a can body by forming a three-dimensional pattern by recessing and deforming a desired position of a cylindrical can body. Because A pair of holding members are brought into contact with both ends of the can body in the axial direction so as to sandwich the can body, and the outer surface of the peripheral wall of the can body is exposed and the inside of the can body is sealed and held in a hollow state. The can body holding step, and the can body holding state in the can body holding step is maintained and gas is introduced into the inside of the can body from the gas inlet provided in at least one of the holding members, and directly into the inner surface of the can body A gas introduction step of bringing gas into contact and maintaining the inside of the can body at a predetermined pressure only by the gas, and the gas introduction step A press molding process in which a pressing member is pressed from the outside to the peripheral wall of the can body maintained at a predetermined pressure, and a recessed deformed portion having a predetermined shape is formed on the peripheral wall of the can body With It is characterized by that.
[0013]
As a result of various tests, the present inventor inserts a receiving mold into the can body as in the past by pressing the pressing member against the outer surface of the peripheral wall of the can body whose inside is maintained at a predetermined pressure by gas. It has been found that the can body peripheral wall can be accurately recessed into a desired shape.
[0014]
That is, since the gas inside the can body in the press molding process is maintained at a predetermined pressure, pressure is uniformly applied to the inner surface of the peripheral wall of the can body toward the outside of the can body. In this state, when the outer surface of the peripheral wall of the can body is pressed by the pressing member, the can body peripheral wall at the contact portion of the pressing member is recessed. The deformation of the can body is suppressed with the same action as that of the conventional receiving mold. Thereby, it is possible to indent and deform only at the contact portion of the pressing member without inserting a conventional receiving die or molding head into the can body, and it is possible to perform outer shape processing on the can body at low cost. .
[0015]
And since the drawing deformation due to the conventional receiving mold does not occur in the thickness direction of the can body, there is almost no decrease in the thickness in the recessed and deformed portion, and the outer shape can be processed without reducing the strength of the can body. Can be applied. In addition, since the conventional receiving mold is not required, it is possible to reliably prevent scratches on the inner surface side of the can body.
[0017]
Furthermore, in the present invention First, the can body is held in the exposed state of the outer surface of the peripheral wall of the can body by the can body holding step. At this time, the can body is held with the inside sealed by a pair of holding members. Next, gas is introduced into the inside of the can body from the gas inlet provided in the holding member by the gas introduction step. Both ends of the can body are hermetically held by both holding members, whereby the inside of the can body rises to a predetermined pressure. Thereafter, the press molding step is performed. By carrying out like this, the said press molding process can be efficiently performed with respect to the can body which the inside was maintained at the predetermined pressure with gas. Further, in the outer shape processing method according to the present invention, gas is introduced into the inside of the can body from the gas introduction port provided in at least one of the holding members, so that not only the can body opened at both ends but also a so-called three-piece can, for example Even if it is a can body with one end opened and a can lid wound around the other end, or a two-piece can body that has a bottom formed integrally with the can body, the outer shape can be easily processed. Can do. Moreover, even if the can body is subjected to neck-in processing or flange processing, the outer shape can be processed without hindrance.
[0018]
In the press molding step of the present invention, the peripheral portion of the roller-shaped pressing member provided rotatably is rolled while being pressed against the outer wall of the can body, and continuously over a predetermined range of the peripheral wall of the can body. An indented deformable portion can be formed. Thereby, it can be made to indent and deform over the perimeter wall of a can barrel, and can shape processing of a can barrel can be performed very efficiently.
[0019]
As one aspect of the press molding step, the pressing member is moved in a predetermined distance in the axial direction of the can body while being pressed and rolled to the peripheral wall of the can body, and continuously recessed over a predetermined range in the axial direction of the can body. By forming the recessed deformation portion thus formed, it can be recessed to a desired width. Thereby, even if it uses the press member which has a single press width, the width dimension of a concave deformation part can be easily adjusted with the movement distance of this press member.
[0020]
At this time, while moving the pressing member in the axial direction of the can body, the pressure contact force to the can body by the pressing member can be gradually increased or decreased, and the can body can be deformed into a taper shape. A high can body can be easily formed.
[0021]
Further, as another aspect of the press molding step, a predetermined interval is provided in the axial direction of the can body by performing press-contact rolling in the circumferential direction of the can body by the pressing member with a predetermined interval in the axial direction of the can body. It is possible to easily improve the design of the can body by forming a plurality of recessed deformation portions arranged at intervals.
[0022]
The other aspect of the said press molding process is the predetermined range of the axial direction of a can cylinder by pressing and rolling the said press member along the surrounding wall of a can cylinder leaving inclination with respect to the circumferential direction of a can cylinder. Thus, the concave deformable portion that is continuous in a spiral shape can be formed to easily improve the design of the can body.
[0023]
Further, in the method of the present invention, the pressing member is formed in a disk shape and is rotatably provided, and a plurality of convex portions having a predetermined shape are provided at a peripheral portion of the pressing member in the circumferential direction of the pressing member. In the press molding step, the peripheral edge of the pressing member is rolled while pressing the peripheral edge of the pressing member against the outer wall of the can body. It is possible to form a plurality of recessed deformation portions arranged at predetermined intervals in a very efficient manner.
[0024]
At this time, a plurality of arrangements are made in the circumferential direction and the axial direction of the outer wall of the can body by performing press-contact rolling in the circumferential direction of the can body by the pressing member with a predetermined interval in the axial direction of the can body The recessed deformation portion can be easily formed.
[0025]
Alternatively, a plurality of pressure members arranged in a spiral manner over a predetermined range in the axial direction of the can body simply by pressing and rolling along the peripheral wall of the can body while being inclined with respect to the circumferential direction of the can body The recessed deformation portion can be easily formed.
[0026]
In the method of the present invention, when the can body is formed of aluminum having a thickness of 0.06 to 0.2 mm, the gas pressure inside the can body is maintained at 0.1 to 0.5 MPa. When the can body is made of steel having a wall thickness of 0.1 to 0.3 mm, it is preferable to maintain the gas pressure inside the can body at 0.1 to 0.7 MPa. This has been clarified by various tests by the present inventors. That is, the aluminum can body having a wall thickness of 0.06 to 0.2 mm is commonly used, and the steel can body having a wall thickness of 0.1 to 0.3 mm is commonly used. Within these wall thickness ranges, the pressure of the gas applied to the inside of the can body by both the aluminum can body and the steel can body is 0.1 MPa or more, so that the pressing member to the can body It is possible to maintain the shape of the can body at the time of pressure welding, and to reliably form the recessed deformation portion, and the state where the can body shape cannot be maintained before the recessed deformation portion is formed on the can body, resulting in crushing deformation. Can be prevented. In addition, the aluminum can body is 0.5 MPa or less, and the steel can body is 0.7 MPa or less, thereby preventing excessive expansion and cracks in the can body, thereby improving the indented deformation portion. Can be formed. Therefore, by maintaining the pressure of the gas according to the material of the can body, the recessed deformation portion can be reliably formed in the can body.
[0027]
And when the said pressing member is provided with the several convex part of predetermined shape, after maintaining the said gas pressure according to the material of a can body, in the said press molding process, the said convex part of the said pressing member The indentation dimension into the peripheral wall of the can body is 0.1 to 1.2 mm from the outer surface of the peripheral wall of the can body toward the inside of the can body, and each protrusion of the pressing member has a protrusion amount that is greater than the indentation dimension. It is preferable that the tip is disposed at a distance of 1 mm or more and has a tip shape having a radius of curvature of 1 to 3 mm in a cross-sectional shape along the axis of the pressing member.
[0028]
When the indenter deforms the outer wall of the can body by the convex portions of the pressing member, the amount of deformation is relatively small by setting the interval between the convex portions of the pressing member and the tip shape of the convex portions within the above ranges. However, it has been found that a concave deformation portion having high aesthetic appearance and high visibility can be formed efficiently. That is, according to the various tests of the present inventors, when the recessed dimension of each convex portion into the can body is shallower than 0.1 mm, the recessed deformation of the can body is hardly seen, and the recessed dimension is less than 0.1 mm. An indentation deformation that was sufficiently visible by deepening was obtained. In addition, since a predetermined pressure is applied as a gas inside the can body, even if the indentation dimension of each convex portion into the can body exceeds 1.2 mm, the can body is recessed by pushing back the internal pressure of the can body. It has been clarified that there is almost no change in the depth dimension of the deformed portion, and a recessed deformed portion having a sufficient depth can be formed without unnecessarily deeply recessed the convex portion. Further, when the indentation dimension is 0.1 to 1.2 mm, when the interval between the convex portions of the pressing member is narrower than 1 mm, adjacent concave deformation portions are continuously formed, It has been clarified that each of the plurality of recessed deformation portions can be formed independently and visually recognized by setting the interval between the protrusions to 1 mm or more. Furthermore, since the cross-sectional shape of the tip of the convex portion along the axis of the pressing member is excessively sharp when the radius of curvature is less than 1 mm, the can body may be damaged or pierced. On the other hand, when the concave dimension is in the range of 0.1 to 1.2 mm, if the convex tip has a curvature radius larger than 3 mm, the concave deformation into the can body becomes insufficient, and the convex tip curvature is insufficient. It has been clarified that a recessed deformation portion that can be reliably recognized can be formed by setting the radius to 3 mm or less. At this time, by making the protruding amount of each convex part of the pressing member larger than the concave dimension, it is possible to form a sufficient concave deformation part in the can body pressed by the tip of the convex part.
[0029]
And the concave deformation part formed by each convex part of the pressing member can deform the peripheral wall of the can body very shallowly and finely by applying a predetermined pressure by gas inside the can body. Specifically, it is possible to form a recessed deformation portion that can be surely recognized even if the deformation amount of each recessed deformation portion is small. According to this, not only the strength of the can body is not lowered, but also a three-dimensional pattern having a presence and a high beauty can be formed. Furthermore, by forming a concave deformation portion by fine deformation in the can body, for example, even if a product display or the like is printed on the surface of the can body, a three-dimensional pattern that does not make it difficult to see the printing is obtained. be able to.
[0030]
The apparatus of the present invention realizes the above-described method of the present invention. The can body holding means for holding the outer surface of the peripheral wall of the can body, the inside of which is maintained at a predetermined pressure by gas, and the can A pressing member provided to be able to advance and retreat in a direction in which it can be pressed against and separated from the peripheral wall of the can body held by the body holding means; A pressure contact means for entering and deforming, The can body holding means includes a pair of holding members that are in contact with both axial ends of the can body and sandwich the can body so as to seal and hold the inside of the can body in a hollow state. A gas is introduced into the inside of the can body through a gas introduction port formed in at least one of the holding members of the holding means, and the gas is brought into direct contact with the inner surface of the can body. Provided with gas introduction means to maintain It is characterized by that.
[0031]
According to the apparatus of the present invention, the can body maintained at a predetermined pressure with gas is held by the can body holding means, and the pressing member is pressed against the peripheral wall of the can body by the pressure contact means. Thus, the can wall can be accurately recessed into a desired shape without inserting a receiving mold into the can body as in the prior art, and the outer shape can be reliably processed with a simple device configuration. .
[0033]
Furthermore, Since gas is introduced into the inside of the can body from the gas introduction port provided in at least one of the holding members, one end is opened with a so-called three-piece can, for example, a so-called three-piece can, and a can lid at the other end The outer shape can be easily applied even when the can body is in a state of being wound, or the can body for a two-piece can whose bottom is formed integrally with the can body.
[0034]
In the apparatus of the present invention, the can body holding means includes both the holding members rotatably, and rotation driving means for rotating the can body around its axis via at least one holding member, and the pressing member is It is formed in the shape of a roller, and is characterized in that it is rotatably provided with a peripheral edge pressed against the outer wall of the can body.
[0035]
As a result, the entire circumference of the can body can be recessed by simply rotating the can body with the rotation drive means while the pressing member is in pressure contact with the outer wall of the can body, and the apparatus configuration is simplified and extremely efficient. External processing can be applied to the can body.
[0036]
Furthermore, in the apparatus of the present invention, a moving means for moving the pressing member along the axis of the can body is provided. According to this, in a state where the can body is rotated by the rotation driving means, and the roller-shaped pressing member is pressed against the can body, the moving member simply moves the pressing member along the axis of the can body, The can body can be deformed in a relatively wide recess. Further, the state where the can body is rotated by the rotation driving means is maintained, the roller-shaped pressing member is first pressed against the can body, then the pressing member is separated from the can body, and then the pressing member is moved by the moving means. By repeatedly moving a predetermined distance along the axis of the cylinder and then pressing the pressing member against the can body, it is very easy to deform in a plurality of rows with a predetermined interval in the axial direction of the can cylinder. Can be done.
[0037]
Further, at this time, by supporting the pressing member so as to be rotatable with respect to the circumferential direction of the can body, the can body is rotated by the rotation driving means, and the pressing member is pressed by the pressure contact means. The outer wall of the can body can be helically recessed and deformed only by moving the pressing member by the moving means while being pressed against the outer wall of the can body.
[0038]
Further, since the pressing member is rotatable, a plurality of convex portions having a predetermined shape are arranged on the outer periphery of the pressing member at predetermined intervals in the circumferential direction of the pressing member. A plurality of recessed deforming portions with a predetermined interval can be formed on the entire circumference of the peripheral wall of the can body simply by rotating the can body with the rotation driving means while being in pressure contact with the outer wall of the can body.
[0039]
In the present invention, it is preferable that the pressing member is provided with a rotation driving means for rotating the pressing member in synchronization with the can body held by the can body holding means. When the pressing member in a state where the rotation is stopped is pressed against the peripheral wall of the rotating can body, the time from when the pressing member contacts the can body until the rotation starts with the rotation of the can body There is a possibility that a time delay occurs and the convex portion rubs when it comes into contact with the peripheral wall of the can body, and does not become a desired concave deformation portion. Therefore, by providing the rotating means and rotating the pressing member in synchronization with the can body, the convex portion of the pressing member can be pressed against the can body without causing a delay from the rotation of the can body. A recessed deformation part can be reliably formed in the peripheral wall.
[0040]
At this time, if one aspect of the rotational driving means of the pressing member is cited, the rotational driving means is provided with a driving pulley provided coaxially with at least one of the holding members, and provided separately from the driving pulley. An idle pulley having a belt spanned between the pulley and a press contact pulley provided coaxially with the pressing member, and press-contacting the belt and rotating following the belt, wherein the press contact means includes: The pressing member is advanced and retracted in a direction in which the pressing member is pressed against and separated from the peripheral wall of the can body while maintaining the pressing state of the pressing pulley to the belt.
[0041]
By configuring the rotation driving means in this way, first, the drive pulley rotates in synchronization with the can body by rotating the holding member. Due to the rotation of the drive pulley, the belt stretched between the idle pulley rotates. The pressure contact pulley is pressed against the belt, and the pressing means can be rotated through the pressure contact pulley by the rotation of the belt. Furthermore, the pressure contact pulley maintains pressure contact with the belt even when the pressure member is advanced and retracted in the direction of pressure contact and separation with respect to the peripheral wall of the can body. When pressed, the pressing member can be rotated in synchronization with the can body.
[0042]
Further, at this time, a moving means for moving the pressing member along the axis of the can body is provided, and the pressure-contact pulley has a width corresponding to a moving distance of the pressing member by the moving means. It is characterized by being formed in dimensions. When the pressing member is moved along the axis of the can body by the moving means, the belt can move relatively along the pressure contact surface of the pressure contact pulley while maintaining the pressure contact state with the pressure contact pulley. Thereby, even when the pressing member is moving along the axis of the can body, the pressing member can be rotated in synchronization with the can body.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 is an explanatory side view showing a schematic configuration of the implementation apparatus of the present invention, FIG. 2 is a cross-sectional explanatory view of the main part of the implementation apparatus, FIG. 3 is an explanatory view showing a holding state of the can body by a holding member, FIG. Is an explanatory perspective view showing the pressing member and its convex part, FIG. 5 is an explanatory view showing the operation of the present embodiment when the can body is inserted, FIG. 6 is an explanatory view showing the operation of the pressure contact means, and FIG. FIG. 8 is an explanatory view showing an operation during outer shape processing, FIG. 8 is an explanatory view showing a press forming step and a recessed deformation portion of the can body, and FIG. 9 is an explanatory view showing a can body formed using another pressing member. FIGS. 10 to 12 are explanatory views showing the holding state of the can body by other holding members, and FIGS. 13 to 16 are explanatory views showing the press molding process using the other pressing members.
[0044]
In FIG. 1, 1 is an outer shape processing apparatus, 2 is an input turret that inputs a can body 4 from the input path 3 to the outer shape processing apparatus 1, and 5 is a payout that pays out the can body 4 from the outer shape processing apparatus 1 to an output path 6. Turret. As will be described in detail later, the outer shape processing apparatus 1 has a plurality of can body holding means 8 that rotate around a rotation shaft 7 that is rotated by a rotation driving means (not shown), and a can body that is held by the can body holding means 8. 4 is provided with pressing means 9 that presses against the peripheral wall 4 and performs external processing on the can body 4. The input turret 2 sucks and holds the can body 4 supplied along the input path 3 individually and transfers it to the can body holding means 8 at the input position A. The dispensing turret 5 sucks and receives the can barrel 4 which is held by the can barrel holding means 8 and has been subjected to the outer shape processing at the dispensing position B, and sends it out to the dispensing path 6.
[0045]
The external shape processing apparatus 1 includes a pair of disk-shaped rotation support portions 10 and 11 connected to the rotation shaft 7 as shown in a partial cross section in FIG. 2, and the peripheral edges of both rotation support portions 10 and 11. A plurality of can barrel holding means 8 are supported at predetermined intervals in the section. The can body holding means 8 is provided with a first holding member 12 that is in contact with one end of the cylindrical can body 4 that opens, and is opposed to the first holding member 12. And a second holding member 13 in contact with the other end. As shown in FIG. 3, the first holding member 12 has a shape corresponding to the flange portion 15 formed on the peripheral edge of the opening 14 of the can body 4, and a contact portion that comes into airtight contact with the flange portion 15. 16 is provided. The second holding member 13 includes a contact portion 18 that has a shape corresponding to the closed bottom portion 17 of the can body 4 and contacts the bottom portion 17. In the present embodiment, the can body 4 subjected to the outer shape processing is made of relatively thin aluminum, and forms a so-called two-piece can in which a can lid (not shown) is wound around the opening 14.
[0046]
As shown in FIG. 2, the first holding member 12 is provided at the tip of the first rotating shaft 19. The first rotating shaft 19 is rotatably supported by a first advancing / retreating member 20 that is supported by one rotation support portion 10 so as to be able to advance and retract. The first advance / retreat member 20 includes a pair of first cam rollers 21 and 22 at a rear end portion thereof. The first cam rollers 21 and 22 are guided by first cam rails 24 and 25 formed on a first guide frame 23 provided in an annular shape along the outer side of the rotary shaft 7, and the first advance / retreat member 20 is guided by this guide. Advance and retreat. The first guide frame 23 rotatably supports a part of the rotating shaft 7 via a bearing 26. The first guide frame 23 is provided with an annular first drive gear 27, and the first rotating shaft 19 includes a first driven gear 28 that meshes with the first drive gear 27. As a result, the first rotary shaft 19 and the first holding member 12 are rotationally driven by the first drive gear 27 via the first driven gear 28 as the rotary shaft 7 rotates. In addition, the first cam rollers 21 and 22 are guided to the first cam rails 24 and 25 as the rotary shaft 7 rotates. Accordingly, at the charging position A (shown in FIG. 1), the first rotating shaft 19 and the first holding member 12 are advanced toward the can body 4 via the first advancing / retracting member 20, and the dispensing position B (FIG. 1). In the figure, the first rotary shaft 19 and the first holding member 12 are moved backward in the direction away from the can body 4 via the first advance / retreat member 20.
[0047]
Further, the first holding member 12 is formed with an air introduction port 30 in which one end of an air flow path 29 formed along the axes of the first rotating shaft 19 and the first advance / retreat member 20 is opened. An air supply means (gas introduction means) (not shown) is connected to the air flow path 29 via a connection tube 31 extending from the rear part of the first advance / retreat member 20, and as shown in FIG. A predetermined pressure of air is introduced into the inside of the can body 4 through the port 30 and the inside of the can body 4 is maintained at a predetermined pressure.
[0048]
As shown in FIG. 2, the second holding member 13 is provided at the tip of the second rotating shaft 32. The second rotating shaft 32 is rotatably supported by a second advancing / retracting member 33 that is supported by the other rotation support portion 11 so as to freely advance and retract. A pair of second cam rollers 34 and 35 are provided at the rear end portion of the second advance / retreat member 33. The second cam rollers 34 and 35 are guided by second cam rails 37 and 38 formed on a second guide frame 36 provided in an annular shape along the outer side of the rotary shaft 7, and the second advancing and retracting member 33 is guided by this guidance. Advance and retreat. The second guide frame 36 rotatably supports a part of the rotary shaft 7 via a bearing 39. The second guide frame 36 is provided with an annular second drive gear 40, and the second rotary shaft 32 includes a second driven gear 41 that meshes with the second drive gear 40. Thereby, the second rotating shaft 32 and the second holding member 13 are rotated by the second driving gear 40 via the second driven gear 41 in accordance with the rotation of the rotating shaft 7. The second cam rails 37 and 38 guide the second cam rollers 34 and 35 with the rotation of the rotary shaft 7. As a result, at the charging position A (shown in FIG. 1), the second rotating shaft 32 and the second holding member 13 are moved forward toward the can body 4 via the second advance / retreat member 33, and the payout position B (FIG. 1). In FIG. 2, the second rotary shaft 32 and the second holding member 13 are retracted in a direction away from the can body 4 through the second advance / retreat member 33.
[0049]
Further, the pressing means 9 is provided between the rotation support portions 10 and 11.
The pressing means 9 includes a bracket 42, a rotating shaft 43 rotatably supported by the bracket 42, and a plurality of (seven in this embodiment) supported by the rotating shaft 43 at a predetermined interval. And a pressing member 44. The bracket 42 is integrally connected to the support shaft 45. The support shaft 45 is supported by both rotation support portions 10 and 11 so as to be rotatable and slidable in the axial direction. More specifically, a part of the support shaft 45 is supported by the rotation support portion 10 via the cylindrical member 46. The cylindrical member 46 is rotatably supported by the rotation support portion 10. The support shaft 45 is slidably inserted into the cylindrical member 46 and is provided so as to rotate together with the cylindrical member 46. A swing arm 46a is connected to the rear end of the cylindrical member 46, and a third cam roller 47 is provided on the swing arm 46a.
[0050]
Further, a moving block 45a is provided at the rear end portion of the support shaft 45 so that the support shaft 45 is rotatably inserted therein and movable in the axial direction together with the support shaft 45. A fourth cam roller 49 is provided on the moving block 45a.
[0051]
The third cam roller 47 is guided by a third cam rail 48 formed on the first guide frame 23. The third cam roller 47 rotates the cylindrical member 46 and the support shaft 45 through the swing arm 46 a by the guide of the third cam rail 48, and swings the bracket 42 connected to the support shaft 45 to press the member. 44 is pressed against the can body 4. The support shaft 45, the cylindrical member 46, the swing arm 46a, the third cam roller 47, and the third cam rail 48 constitute the pressure contact means of the present invention.
[0052]
The fourth cam roller 49 is guided by a fourth cam rail 50 formed on the first guide frame 23. The fourth cam roller 49 moves the moving block 45a to the right in the drawing by the guide of the fourth cam rail 50, moves the support shaft 45 in the axial direction thereof, and further passes through the bracket 42 connected to the support shaft 45. Then, the pressing member 44 is moved in the axial direction of the can body 4. The moving block 45a, the fourth cam roller 49, and the fourth cam rail 50 constitute the moving means of the present invention.
[0053]
Further, the pressing means 9 includes a pressure pulley 51 on a rotating shaft 43 supported by the bracket 42. The pressure-contact pulley 51 is pressed against a belt 54 that is stretched between a drive pulley 52 provided on the second holding member 13 and an idle pulley 53 that is rotatably supported by the other rotation support portion 11, and will be described later. Thus, it is configured to be able to swing while being rotated in synchronization with the second holding member 13. The pressure contact pulley 51 is a pressure contact surface having a width corresponding to the moving distance of the pressing member 44 so that the pressure contact with the belt 54 can be maintained even if the bracket 42 and the pressing member 44 move in the axial direction of the can body 4. 51a.
[0054]
Further, the pressing member 44 is formed in a disc shape as shown in FIG. 4A, and a plurality of convex portions 55 are formed at predetermined intervals on the peripheral edge thereof. As shown in FIG. 4B, the convex portion 55 has a tip 55 a having a radius of curvature of 3 mm in a cross-sectional shape along the axis of the pressing member 44. Further, the protrusions 55 are disposed with a protruding distance of more than 1.2 mm and an interval of 1 mm. Although not shown, the pressing member 44 has a slight inclination angle (for example, 3 °) with respect to the axis of the can body 4 so that the pressing shaft 44 is pressed against the circumferential direction of the can body 4 with an inclination. ) And is supported by the bracket 42.
[0055]
Next, the outer shape processing of the can body 4 by the outer shape processing apparatus 1 of the present embodiment will be described. First, referring to FIG. 1, the can body 4 continuously supplied along the input path 3 is held by the input turret 2 and is held by the can body holding means 8 at the input position A. At this time, at the loading position A, as shown in FIG. 5A, the first holding member 12 and the second holding member 13 are retracted in a direction away from each other, and are held by the loading turret 2. The can body 4 is positioned between the first holding member 12 and the second holding member 13. Next, as shown in FIG. 5 (b), the first holding member 12 and the second holding member 13 move forward in a direction approaching each other, and the can body is interposed between the first holding member 12 and the second holding member 13. 4 is pinched (can body holding process). In this state, the outer peripheral surface of the can body 4 is exposed. Further, as shown in FIG. 3, the contact portion 16 of the first holding member 12 comes into airtight contact with the flange portion 15 of the opening 14 of the can body 4, and the contact portion 18 of the second holding member 13 forms the can body 4. Abuts against the bottom 17. At this time, as shown in FIG. 5B, since the first holding member 12 and the second holding member 13 are rotating, the can sandwiched between the first holding member 12 and the second holding member 13 The body 4 is rotated.
[0056]
Subsequently, as shown in FIG. 3, the holding state of the can body 4 by the first holding member 12 and the second holding member 13 is maintained, and the can body 4 can be supplied from the air introduction port 30 provided in the first holding member 12. Air is introduced into the interior of the can body 4 to maintain the air pressure inside the can body 4 at a predetermined pressure (gas introduction step). The air pressure at this time maintains the air pressure inside the can body at 0.1 to 0.5 MPa when the can body 4 is formed of aluminum having a wall thickness of 0.06 to 0.2 mm.
[0057]
Next, as shown in FIG. 6, the pressing member 44 is pressed against the can body 4. That is, the third cam roller 47 of the swing arm 46a extending from the cylindrical member 46 is guided by the third cam rail 48, and the pressing member 44 is pressed against the can body 4 by swinging the bracket 42 about the support shaft 45. Is done. At this time, the rotation of the pressing member 44 is maintained via the pressure contact pulley 51 following the rotation of the drive pulley 52 and the idle pulley 53. Then, as shown in FIG. 7 (a), each pressing member 44 comes into pressure contact with the can body 4, so that the pressing member 44 is placed on the outer wall of the can body 4 as shown in an enlarged sectional view in FIG. 8 (a). A concave deformation portion 56 is formed by the convex portion 55. The pressing member 44 is in pressure contact from the outer peripheral surface of the can body 4 toward the inside of the can body 4 until the indentation dimension a of the convex portion 55 becomes 1.2 mm. In addition, if the indentation dimension a at this time is 0.1 mm-1.2 mm, the indentation deformation | transformation part 56 with high aesthetics which can fully be visually recognized can be formed.
[0058]
Further, as shown in FIG. 7B, the pressing member 44 is moved along the axial direction of the can body 4. The movement of the pressing member 44 at this time is performed by guiding the fourth cam roller 49 by the fourth cam rail 50 as described above with reference to FIG. That is, when the fourth cam roller 49 is moved rightward in FIG. 2 by the fourth cam rail 50, the support shaft 45 is moved in the axial direction via the moving block 45a. As a result, the bracket 42 moves together with the support shaft 45, and the pressing member 44 moves along the axial direction of the can body 4.
[0059]
Since the pressing member 44 rolls with an inclination with respect to the circumferential direction of the can body 4, a plurality of recessed deformation portions 56 arranged in a spiral shape are formed on the outer wall of the can body 4. As shown in FIG. 8 (b), the recessed deformation portion 56 has a depth dimension b slightly shallower than the recessed dimension a due to the separation of the protrusion 55 and the return of the air pressure inside the can body 4. . For this reason, in FIG. 8A, the indentation dimension a by the convex portion 55 is almost invisible when it is smaller than 0.1 mm, but the indentation dimension a by the convex portion 55 is surely visible if it is larger than 0.1 mm. Become. The interval c between the convex portions 55 shown in FIG. 4 (a) may be 1 mm or more, and the tip 55a of the convex portion 55 shown in FIG. 4 (b) has a radius of curvature of 1 to 3 mm. A tip shape is preferred.
[0060]
When the outer wall of the can body 4 is indented and deformed by the convex portions 55 of the pressing member 44, referring to FIG. 4A, the interval between the convex portions 55 of the pressing member 44 and the tip shape of the convex portions 55. It is possible to form another recessed deformation portion having a high aesthetic appearance by changing the angle. That is, the can body 4 provided with the recessed deformation portion 56 formed in the present embodiment is shown in FIG. 9A, but compared with that, other pressing members are not shown, but the shape of the convex portion is substantially the same. If it is conical, the recessed deformation part 57 shown in FIG.9 (b) can be formed. Further, by providing a continuous convex portion on the outer periphery of the pressing member, a continuous linear concave deformation portion 58 can be formed as shown in FIG.
[0061]
Further, in the present embodiment, as shown in FIG. 2, the seven pressing members 44 are held on the rotating shaft 43 at a predetermined interval, whereby the pressing members 44 are moved in the axial direction of the can body 4. The amount of the pressing member 44 can be increased or decreased in accordance with the length dimension of the can body 4 in the axial direction (height dimension of the can body 4), although the amount is reduced to improve the efficiency of the outer shape processing. . Further, even if the single pressing member 44 is held on the rotating shaft 43 and the movement amount thereof is extended, the same recessed deformation portion 56 can be formed. Furthermore, in this embodiment, by tilting the rotating shaft 43 that supports the pressing member 44, a plurality of recessed deformation portions 56 arranged in a spiral shape as shown in FIG. 9A are formed. The rotating shaft 43 that supports the member 44 may be provided in parallel to the axis of the can body 4. In this case, although not shown, recessed deformation portions arranged in a ring shape in the outer peripheral direction of the can body 4 can be formed.
[0062]
As described above, according to the present embodiment, by introducing air of a predetermined pressure into the can body 4, the concave deformation portion 56 can be formed simply by pressing the pressing member 44 against the outer surface of the peripheral wall of the can body. Can do. As a result, the outer shape can be processed without inserting a conventional receiving mold into the can body 4, so that the inner surface of the can body 4 is not damaged and the apparatus configuration can be simplified. 4 can be contoured.
[0063]
In addition, in this embodiment, as shown in FIG. 3, although the method of giving an external shape processing to the aluminum can barrel 4 of what is called a two piece can which one end part opened, the method of this invention is a figure. The present invention can also be applied to other can bodies 60, 61, and 62 as shown in FIGS. That is, as shown in FIG. 10, when performing outer shape processing on a so-called three-piece can body 60 made of steel having both ends opened, the first holding member 63 is brought into contact with one opening 64 of the can body 60, The second holding member 65 is brought into contact with the other opening 66 of the can body 60 to hold the can body 60. Then, air is introduced into the inside of the can body 60 from the opening 64 side of the can body 60 through the air introduction port 66 of the first holding member 63. When the can body 60 has a thickness of 0.1 to 0.3 mm, the air pressure inside the can body 60 is maintained at 0.1 to 0.7 MPa.
[0064]
Further, as shown in FIG. 11, when the outer shape is applied to a can body 62 having a so-called three-piece can made of steel and having a can lid 67 wound on the other end, it corresponds to the tightening portion 68 of the can lid 67. A second holding member 70 having a contact portion 69 is provided to hold the can body 61 between the first holding member 71. Then, air is introduced into the can body 61 from the opening 72 side of the can body 61 through the air introduction port 73 of the first holding member 71.
[0065]
As shown in FIG. 12, an annular canopy 75 having an opening 74 formed in the center is wound around one end, and a steel can body is wrapped around a dome-shaped bottom lid 76 at the other end. 62 (for example, a can body for an aerosol can), a first holding member 79 having a contact portion 78 corresponding to the shape of the tightening portion 77 of the canopy 75, and a tightening portion 80 of the bottom lid 76. The can body 62 is sandwiched by the second holding member 82 having the contact portion 81 corresponding to the above. Then, air may be introduced into the inside of the can body 62 from the opening 74 of the annular canopy 75 through the air introduction port 83 of the first holding member 79. As described above, according to the present invention, the outer shape can be easily applied to the various can bodies 4, 60, 61, 62.
[0066]
Further, by adopting the outer shape processing method of the present invention, it is possible to form a further different indentation deformed portion. That is, as shown in FIG. 13, the inside of the steel can body 60 (or 61, 62) is rotated while being held at a predetermined air pressure, and the outer wall of the can body 4 has a relatively large width and depth. A pressing roller 85 (other pressing member) having a shape corresponding to the recessed deformation portion 84 may be pressed and rolled.
[0067]
Further, as shown in FIG. Can body 60 By moving the pressing roller 85 in the axial direction of the can body 60 while pressing the peripheral wall, the recessed deformation portion 84 can be expanded to a desired width.
[0068]
Furthermore, as shown in FIG. 15, a plurality of annular recessed deformation portions 84 can be formed by pressing and pressing the pressing roller 85 into a plurality of locations on the peripheral wall of the can body 60.
[0069]
Furthermore, as shown in FIG. 16, the pressing of the peripheral wall by the pressing roller 85 is maintained, the pressing roller 85 is moved in the axial direction of the can body 4, and the pressing force of the pressing roller 85 is gradually increased during this movement. By making it small, the outer shape of the can body 60 can be formed in a tapered shape.
[0070]
In the present embodiment, the pressing member 44 or the pressing roller 85 is used to press the outer wall of the can body to form the recessed deformation portion. However, the present invention is not limited to this. Absent. Although not shown, instead of the pressing member 44 and the pressing roller 85, for example, another rod-shaped pressing member having a hemispherical pressing surface at the tip may be provided, and only a part of the can body may be recessed. .
[0071]
Furthermore, in the present embodiment, as shown in FIG. 7B, when the recessed deformation portion 56 is formed on the entire circumference of the can body 4, the can body 4 is rotated about its axis. In addition, although not shown, the pressing member 44 may be rotated around the axis of the can body 4 without rotating the can body 4. Even when the concave deformation portion 56 is provided in a desired range, the pressing member 44 is moved in the axial direction of the can body 4, although not shown, the can body 4 is moved without moving the pressing member 44. It may be moved in the axial direction of the can body 4. Moreover, in this embodiment, although air was employ | adopted as gas introduced into the inside of the can body 4, it is not restricted to it, For example, you may use other gas, such as nitrogen gas and a carbon dioxide gas. For example, even if gas and liquid are accommodated in the can body, the same effect can be obtained if a predetermined pressure by the gas is applied in the can body.
[Brief description of the drawings]
FIG. 1 is an explanatory side view showing a schematic configuration of an implementation apparatus of the present invention.
FIG. 2 is a cross-sectional explanatory view of a main part of the present embodiment device.
FIG. 3 is an explanatory view showing a state in which the can body is held by a holding member.
FIG. 4 is an explanatory view showing a press molding process and a recessed deformation portion of the can body.
FIG. 5 is an explanatory view showing an operation of the present embodiment apparatus when the can body is inserted.
FIG. 6 is an explanatory view showing the operation of the pressure contact means.
FIG. 7 is an explanatory view showing an operation at the time of outer shape processing on the can body.
FIG. 8 is an explanatory perspective view showing a pressing member and its convex portion.
FIG. 9 is an explanatory view showing a can body formed using another pressing member.
FIG. 10 is an explanatory view showing a holding state of the can body by another holding member.
FIG. 11 is an explanatory view showing a holding state of the can body by another holding member.
FIG. 12 is an explanatory diagram showing a holding state of the can body by another holding member.
FIG. 13 is an explanatory view showing a press molding process using another pressing member.
FIG. 14 is an explanatory view showing a press molding process using another pressing member.
FIG. 15 is an explanatory view showing a press molding process using another pressing member.
FIG. 16 is an explanatory view showing a press molding process using another pressing member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... External shape processing apparatus, 4, 60, 61, 62 ... Can barrel, 8 ... Can barrel holding means, 12, 63, 71, 79 ... First holding member (holding member), 13, 65, 70, 82 ... First 2 holding members (holding members), 27, 40... Drive gear (rotation drive means), 28, 41... Driven gear (rotation drive means), 30, 66, 73, 83. ... Pressing member, 47 ... third cam roller (pressure contact means), 48 ... third cam rail (pressure contact means), 49 ... fourth cam roller (movement means), 50 ... fourth cam rail (movement means), 51 ... pressure contact pulley, 51a ... pressure contact surface, 52 ... drive pulley, 53 ... idle pulley, 54 ... belt, 55 ... convex part, 56, 57, 58, 84 ... concave deformation part, 85 ... pressing roller (pressing member).

Claims (19)

A method for external processing of a can body that forms a three-dimensional pattern by indenting and deforming a desired position of a cylindrical can body,
A pair of holding members are brought into contact with both ends of the can body in the axial direction so as to sandwich the can body, and the outer surface of the peripheral wall of the can body is exposed and the inside of the can body is sealed and held in a hollow state. A can body holding process;
The can body is maintained by the can body holding step, the gas is introduced into the inside of the can body from a gas inlet provided in at least one of the holding members, and the gas is brought into direct contact with the inner surface of the can body. A gas introduction step for maintaining the inside of the trunk at a predetermined pressure only with gas;
The pressing member pressed from the outside to the peripheral wall of the can body which inside is maintained to a predetermined pressure by the gas introduction step, and a press forming step of forming a concave deformation of the predetermined shape in a peripheral wall of the can body A method for processing the outer shape of a can body. In the press molding step, a roller-shaped pressing member provided in a freely rotating manner is rolled while pressing the peripheral edge of the pressing member against the outer wall of the can body so as to be continuous over a predetermined range of the peripheral wall of the can body. outline processing method can body according to claim 1, wherein the forming a. In the press molding step, the pressing member is moved in a predetermined distance in the axial direction of the can body while being pressed and rolled to the peripheral wall of the can body, and continuously depressed over a predetermined range in the axial direction of the can body. 3. A can body outer shape processing method according to claim 2, wherein a concave deformation portion is formed . 4. The concave deformation portion is formed in a tapered shape by moving the pressing member in the axial direction of the can body while gradually increasing or decreasing the pressure contact force to the can body by the pressing member. The outer shape processing method of the can body as described. In the press molding step, the pressing member performs pressure rolling in the circumferential direction of the can body with a predetermined interval in the axial direction of the can body, and is arranged with a predetermined interval in the axial direction of the can body. 3. The outer shape processing method for a can body according to claim 2, wherein a plurality of recessed deformation portions are formed . In the press molding step, the pressing member is pressed and rolled along the peripheral wall of the can body while being inclined with respect to the circumferential direction of the can body, and continues spirally over a predetermined range in the axial direction of the can body. 3. A can body outer shape processing method according to claim 2, wherein a concave deformation portion is formed . The pressing member is formed in a disk shape and is rotatably provided, and a plurality of convex portions having a predetermined shape are disposed on the peripheral portion thereof at a predetermined interval in the circumferential direction of the pressing member,
In the press molding step, the peripheral edge of the pressing member is rolled while being pressed against the outer wall of the can body, and a predetermined interval exists in the peripheral wall of the can body by the indentation of each convex portion into the peripheral wall of the can body. 2. A method of processing a contour of a can body according to claim 1, wherein a plurality of recessed deformation portions arranged in a row are formed . In the press molding step, the pressing member performs pressure rolling in the circumferential direction of the can body with a predetermined interval in the axial direction of the can body, and is arranged in the circumferential direction and the axial direction of the outer wall of the can body. The outer shape processing method for a can body according to claim 7, wherein a plurality of recessed deformation portions are formed . In the press molding step, the pressing members are pressed and rolled along the peripheral wall of the can body while being inclined with respect to the circumferential direction of the can body, and are arranged in a spiral shape over a predetermined range in the axial direction of the can body. The outer shape processing method for a can body according to claim 7, wherein a plurality of recessed deformation portions are formed . When the can body is formed of aluminum having a wall thickness of 0.06 to 0.2 mm, the gas pressure inside the can body is maintained at 0.1 to 0.5 MPa,
The gas pressure inside the can body is maintained at 0.1 to 0.7 MPa when the can body is made of steel having a wall thickness of 0.1 to 0.3 mm. 10. A method for external processing of a can body according to any one of 1 to 9 . When the can body is formed of aluminum having a wall thickness of 0.06 to 0.2 mm, the gas pressure inside the can body is maintained at 0.1 to 0.5 MPa,
When the can body is made of steel having a wall thickness of 0.1 to 0.3 mm, the gas pressure inside the can body is maintained at 0.1 to 0.7 MPa,
In the press molding step, the indentation dimension of the convex portion of the pressing member into the peripheral wall of the can body is 0.1 to 1.2 mm from the outer surface of the can body toward the inside of the can body,
Each protrusion of the pressing member has a protruding amount larger than the recessed dimension and is disposed with an interval of 1 mm or more, and 1 to 3 mm in a cross-sectional shape along the axis of the pressing member. 10. The outer shape processing method for a can body according to any one of claims 7 to 9, wherein the tip shape has a curvature radius of . A can body outer shape processing apparatus for forming a three-dimensional pattern by recessing and deforming a desired position of a cylindrical can body,
Can barrel holding means for holding the outer surface of the peripheral wall of the can barrel, which is maintained at a predetermined pressure by gas inside, in an exposed state, and can be moved forward and backward in the direction of pressing and separating from the peripheral wall of the can barrel held by the can barrel holding means A pressure member provided, and pressure contact means for pressing the pressure member against the peripheral wall of the can body and deforming the peripheral wall of the can body into a predetermined shape.
The can body holding means includes a pair of holding members that are in contact with both ends in the axial direction of the can body, sandwich the can body, and seal and hold the inside of the can body in a hollow state,
Gas is introduced into the inside of the can body through the gas introduction port formed in at least one of the holding members of the can body holding means, and the gas is brought into direct contact with the inner surface of the can body so that only the gas in the can body can be obtained. A can body outer shape processing apparatus comprising gas introducing means for maintaining the pressure at a predetermined pressure. The can body holding means is provided with rotation driving means for rotating the can body around its axis via at least one holding member, and both the holding members rotatably.
13. The outer shape processing apparatus for a can body according to claim 12, wherein the pressing member is formed in a roller shape and is rotatably provided with a peripheral edge pressed against an outer wall of the can body. 14. The outer shape processing apparatus for a can body according to claim 13, further comprising moving means for moving the pressing member along the axis of the can body. The pressing member is rotatably supported with an inclination with respect to the circumferential direction of the can body,
When the can body is rotated by the rotation driving means and the pressing member is pressed against the outer wall of the can body by the pressing means, the pressing member is moved by the moving means and the outer wall of the can body is spirally recessed and deformed. The can body outer shape processing apparatus according to claim 14 . 16. A plurality of convex portions having a predetermined shape are arranged on the outer periphery of the pressing member at predetermined intervals in the circumferential direction of the pressing member. outline processing apparatus of the can body. 17. The outer shape processing of a can body according to claim 16, wherein the pressing member is provided with a rotation driving means for rotating the pressing member in synchronization with the can body held by the can body holding means. apparatus. The rotation driving means of the pressing member includes a driving pulley provided coaxially with at least one of the holding members, an idle pulley having a belt provided between the driving pulley and a belt provided between the driving pulley and the driving pulley. A pressing pulley provided coaxially with the pressing member, press-contacting the belt and rotating following the belt,
18. The can body according to claim 17, wherein the press contact means maintains the press contact state of the press contact pulley to the belt, and advances and retracts the pressing member in a direction in which the press member is pressed against and separated from the peripheral wall of the can body. Outline processing equipment. A moving means for moving the pressing member along the axis of the can body is provided,
19. The outer shape processing apparatus for a can body according to claim 18, wherein the pressure contact pulley is formed with a width dimension corresponding to a moving distance of the pressing member by the moving means .

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