JP3546732B2 - Can manufacturing method and manufacturing apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method and a method for manufacturing a can having a configuration in which a dome portion that is recessed toward the inside of the can body is formed at the bottom of the can, and an annular protrusion that protrudes outward in the axial direction of the can is formed around the dome portion. It concerns the device.
[0002]
[Prior art]
BACKGROUND ART Conventionally, as a can used for beverages, a two-piece aluminum alloy can configured by fixing a can lid to an opening of a can body formed into a bottomed cylindrical shape is known. In order to manufacture the two-piece can body, first, an aluminum alloy base plate is punched and drawn using a drawing device to form a cup-shaped member. Next, while holding the cup, a punch sleeve is inserted into the inside to perform re-drawing and ironing, and the bottom of the cup is located between the punch sleeve and the dome forming part having a hemispherical tip that is coaxially opposed to the punch sleeve. The bottom edge is squeezed while sandwiching the can to obtain a bottom-shaped can body 1 shown in FIG.
[0003]
Accordingly, a dome portion 5 which is spherically recessed toward the inside of the can body 1 and a dome portion 5 which is connected to the periphery of the dome portion 5 and protrudes outward from the can body 1 in the can axis direction at the can bottom 3 of the can body 1. An annular convex portion (rim) 7 is formed. The annular convex portion 7 serves as a leg that contacts the ground when the can body 1 is upright, and improves the upright stability and support strength of the can body 1.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, the thickness of cans has been reduced from the viewpoint of resource saving and cost reduction, and various inconveniences have occurred due to a decrease in can strength. In other words, these problems include the problem of insufficient pressure resistance in which the can bottom 3 is deformed without being able to withstand the internal pressure after the contents are enclosed, and the can bottom is deformed or damaged without being able to withstand the impact when the can is dropped. Insufficient strength against vertical load that can not withstand the vertical load applied from above when stacking cans and deforms at the boundary between the can body and the bottom of the can, etc. .
The present invention has been made in view of the above circumstances, and can reduce the thickness of a can, particularly the thickness of the can bottom, without causing deformation of the can bottom and its peripheral portion, and achieving sufficient can strength. It is an object of the present invention to provide a method and an apparatus for manufacturing a can that can be secured.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is to form a dome portion on the bottom of the can that is recessed toward the inside of the can body, and to form an annular protrusion on the periphery of the dome portion projecting outward in the axial direction of the can. When manufacturing a can having a configuration in which a portion is formed, the tip of a plurality of circumferentially movable punch claws provided in the circumferential direction is radiused from the nose portion with the nose portion at the tip of the annular convex portion as a boundary. Direction insideHalfThe tip of the punch claw is brought into contact with the radially outer area,ShrinkageBy moving the diametrical member in the radial direction, it is possible toHalfIn a radially outer region, a method for manufacturing a can in which a plurality of concave portions that are recessed toward the inside of the can body are formed in the circumferential direction.Supplied by a rotating plate having a plurality of pockets on the outer periphery that hold the can body by suctionThe upper end of the can body is brought into contact with the base to support the can body by the base, and the can body supported by the base is brought close to the punch claw, and the tip of the punch claw is brought into the nose portion of the annular convex portion. More radially inward andHalfAbuts the radially outer region, and then expands the radially expanding member andShrinkageBy moving the tip of the punch claw in the radial direction by advancing the diameter member to form a recess in the bottom of the can,ShrinkageThe diameter member is retracted, and the can body supported by the base is separated from the tip of the punch claw.
According to the first aspect, the position of the punch claw is fixed, and the can body supported by the base is first approached to the punch claw so that the tip of the punch claw has a radius larger than the nose portion of the annular convex portion. Direction insideHalfAbuts the radially outer area, and thenShrinkageActivate the diametric member to increase theseShrinkageAfter the tip of the punch claw is moved in the radial direction by a diameter member to form a recess in the bottom of the can, the diameter expansion member andShrinkageBy retracting the diameter member and pulling the can body supported by the base away from the punch claws, the can bottom can be processed smoothly and reliably.
[0006]
The second aspect of the present invention is to support the can body by adsorbing the upper end of the can body to the base.
According to the second aspect, the base is in contact with the upper end of the can body, and the air in the can body is sucked, thereby adsorbing the can body to the base, and firmly fixing the can body to the base, and Transfer smoothly with the base.
[0007]
Claim 3 of the present invention relates to a can having a configuration in which a dome portion recessed toward the inside of the can body is formed at the bottom of the can, and an annular convex portion protruding outward in the axial direction of the can is formed on the periphery of the dome portion. A manufacturing apparatus for manufacturing,A rotating plate having a plurality of pocket portions on the outer peripheral portion for suction holding the can body,A base for supporting the can body by contacting the upper end of the can body;Abuts the area radially inward and radially outward from the nose of the annular projectionA plurality of radially movable tips are provided in the circumferential direction, and the tips are arranged so as to protrude toward the base direction, and are provided so as to be movable back and forth in the can axis direction of the can body supported by the base. A punch claw, and a tip of the punch claw provided on the punch claw so as to be movable back and forth in the can axis direction of the can body.A radially expanding member that moves radially outward and a radially decreasing member that moves the tip of the punch claw radially inward.An actuating member, a dome support member that is provided inside the punch claw and the actuating member so as to be able to move back and forth in the can axis direction of the can body, is provided on the base, and is provided on the base. A base moving mechanism for moving the base back and forth in the can axis direction of the can body, and an operating member moving mechanism provided on the operating member for moving the operating member back and forth in the can axis direction of the can body.
According to the third aspect, the base is moved closer to the punch claw together with the can body by the base moving mechanism, the tip of the punch claw contacts the bottom of the can, and the dome support member contacts the dome portion. After clamping the can body between the dome supporting member and the dome supporting member, the operating member is moved by the operating member moving mechanism, and the tip of the punch claw is moved in the radial direction by the operating member to form a concave portion on the bottom of the can. The two moving mechanisms are sequentially operated to retract the operating member from the punch claw, and to separate the base together with the can body from the punch claw.
According to the third aspect of the present invention, a concave portion is formed in a region radially inner than the nose portion by a combination of a punch claw and a diameter-enlarging member that abuts on a region radially inner than the nose portion of the annular convex portion. In addition, a concave portion can be formed in a region radially outside the nose portion by a combination of a punch claw and a diameter reducing member that abuts on a region radially outside the nose portion of the annular convex portion.
[0008]
According to a fourth aspect of the present invention, the base moving mechanism and the operating member moving mechanism are constituted by a cam mechanism.
According to the fourth aspect, since both the base moving mechanism and the operating member moving mechanism are cam mechanisms, the base moving mechanism and the operating member moving mechanism can be smoothly operated along the cam surface, and can be reliably operated according to a preset cam angle (timing). The base and the operating member can be reciprocated.
[0010]
Claims of the invention5Has a suction means for sucking the inside of a can body on a base.
This claim5In this method, the can body is firmly adsorbed to the base by sucking the internal air from the upper end of the can body in contact with the base by the suction means.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view showing an initial state, FIG. 2 is a cross-sectional view showing a completed state of can body movement (forward), FIG. 3 is a cross-sectional view showing a state immediately before the start of can bottom forming, and FIG. FIG. 5 is a cross-sectional view showing a state when the mold is opened, FIG. 6 is a cross-sectional view showing a state in which the can body has been retracted, FIG. 7 is a cross-sectional view showing a base moving mechanism, and FIG. FIG. 9 is an explanatory view showing a moving state of a base and an operation member. FIG. 10 is a side view of a main part showing an example of a can. FIG. 11 is a plan view of the can of FIG. It is.
[0012]
First, a can manufactured by the manufacturing apparatus of the present embodiment will be described with reference to FIGS.
A dome portion 15 is formed in the can bottom 13 of the can body 11 so as to be recessed toward the inside of the can body 11. On the periphery of the dome portion 15, an annular convex portion (rim) 17 protruding in the direction of the can axis toward the outside of the can body 11 is formed.
The annular convex portion 17 includes a nose portion 17a at the tip, an inner peripheral wall (inner wall) 17b radially inside the nose portion 17a, and an outer peripheral wall (outer wall) 17c radially outward from the nose portion 17a. The inner wall 17b is connected to the dome portion 15 via an annular concave curved surface portion 19, and the nose portion 17a is connected to the can body 11 via an outer wall 17c and an annular convex curved surface portion 20.
From the inner wall 17b to the dome portion 15, a plurality of square inner concave portions 21 are formed in the circumferential direction and are recessed toward the inside of the can body 11. In the outer wall 17c, a plurality of square-shaped outer concave portions 22 are formed in the circumferential direction and are recessed toward the inside of the can body 11.
[0013]
Next, the configuration of the manufacturing apparatus according to the present invention for manufacturing the above-described can 23 will be described.
The manufacturing apparatus 31 according to the present embodiment includes a base 33 that abuts on the upper end of the can body 11 to adsorb and support the can body 11 and moves in the can axis direction; A turret mechanism 39 is provided between the base 33 and the forming mechanism 35 for supplying a can (work) 37 in which the inner concave portion 21 and the outer concave portion 22 have not been formed yet.
[0014]
The can body 11 is subjected to a drawing step of forming a bottomed cylindrical cup from a base plate by drawing, inserting a punch sleeve into the cup and performing re-drawing and ironing, and the can bottom 13 is formed with a punch sleeve and a dome. A redrawing / ironing process and a can bottom forming process of forming the dome portion 15 between the forming portions, a printing process of printing the outer surface of the can body 11, and a necking forming an upper end portion (neck) of the opening of the can body 11 It is manufactured sequentially through the steps. In the present embodiment, the manufacturing apparatus 31 is provided in one of the necking steps.
[0015]
One side of the base 33 is a contact surface 33 a that contacts the upper end of the work 37. A base moving mechanism 60 is connected to the base 33.
As shown in FIG. 7, the base moving mechanism 60 is connected by connecting bolts 600 that penetrate the base 33, and is slidably supported by a shaft support member 601 in a state of allowing movement within a predetermined range. It is mainly composed of a sliding shaft 602, a pair of rotating rollers 603 rotatably provided at a base end of the sliding shaft 602, and a cam 604 sandwiched between these rotating rollers 603.
[0016]
Then, according to the shape of the cam 604, the sliding shaft 602 having the two rotating rollers 603 slides in a direction along the axis while being supported by the shaft supporting member 601. The connected base 33 moves (see FIG. 9).
In addition, suction passages (suction means) 605 and 606 are formed in the connection bolt 600 and the slide shaft 602 through which the base 33 is inserted, and the upper end of the base 33 is connected to the suction passages 605 and 606 through these suction passages. The air inside the abutting can 37 is sucked, and the can 37 is adsorbed on the base 33.
[0017]
The forming mechanism 35 is provided so as to be able to move back and forth in the direction of the can axis of the can body 11 inside the first punch claw 41 and the first punch claw 41, and is provided at the tip of the first punch claw 41. An expanding member (operating member) 43 that abuts and moves the tip of the first punch claw 41 outward, and is movable inward and backward in the can axis direction of the can body 11 inside the expanding member 43. A dome support member 45 provided to contact and support the dome portion 15; a second punch claw 47 disposed outside the first punch claw 41; A diameter reducing member (operating) that is provided to be able to move back and forth in the can axis direction of the can body 11 and abuts on the tip of the second punch claw 47 to move the tip of the second punch claw 47 inward. (Member) 49.
[0018]
The first and second punch claws 41 and 47 are formed by dividing the distal end side of a cylinder made of spring steel, die steel, or the like into a plurality of pieces, and have a ring-shaped base end 41 a of the first punch claw 41. Is mounted inside the second punch claw 47 and is attached to the annular base end 47a of the second punch claw 47.
The distal ends 41b, 47b of the punch claws 41, 47 are formed to have a larger width in the radial direction than the intermediate portions 41c, 47c, and the distal ends 41b, 47b are elastically deformed to be movable in the radial direction. Has become.
Each tip 41b of the first punch claw 41 has a projection 41d projecting outward in the radial direction. The projection 41d corresponds to the shape of the inner recess 21 formed in the can bottom 13. I have.
[0019]
Further, the inner surface side of each tip 41b of the first punch claw 41 comes into contact with the outer peripheral surface 43a of the tip of the cylindrical enlarged diameter member 43. A small diameter hole 43b is formed inside the large diameter member 43, and a bolt 53 is slidably mounted inside the small diameter hole 43b.
The dome support member 45 is screwed into the bolt 53. The dome support member 45 has a T-shaped cross section, and the tip end surface 45a of the dome support member 45 is formed in a convex curved shape.
[0020]
Further, a ring 55 and a spring 57 are mounted in a space formed by the diameter-enlarging member 43, the dome support member 45, and the bolt 53, and the spring 57 causes the dome support member 45 and the bolt 53 to move toward the distal end (see FIG. 1 to 6 (left side in FIG. 6).
[0021]
The distal end surface 47d of the second punch claw 47 is formed as an inclined curved surface that is inclined so as to go outward in the radial direction as it goes forward, and the distal end surface 47d is formed into the shape of the outer concave portion 22 formed in the can bottom 13. Yes, it is. An inclined curved surface 47e is formed on the outer periphery of the distal end of the second punch claw 47 so as to be inclined outward in the radial direction as it goes forward. The inclined curved surface 47e of the second punch claw 47 is in contact with the inclined surface 49a formed on the inner surface of the distal end of the cylindrical reduced diameter member 49.
[0022]
An operating member moving mechanism 62 is connected to the diameter increasing member 43 and the diameter reducing member 49.
As shown in FIG. 8, the operating member moving mechanism 62 is connected to the diameter-enlarging member 43 and the diameter-reducing member 49, respectively, and is slidably movable in a state where the shaft supporting member 621 allows movement within a predetermined range. A supported moving shaft 620, a connecting member 622 attached to the shaft supporting member 621, and connected to the base end of the second punch claw 47 through the projecting portion 620 a at the distal end of the moving shaft 620. It mainly comprises a pair of rotating rollers 623 rotatably provided at the base end of the moving shaft 620, and a cam 624 sandwiched between these rotating rollers 623.
[0023]
Then, according to the shape of the cam 624, the moving shaft 620 having the two rotating rollers 623 slides in a direction along the axis while being supported by the shaft supporting member 621, and is connected to the moving shaft 620. The operating members (diameter expanding member 43 and diameter reducing member 49) move (see FIG. 9).
[0024]
The turret mechanism 39 includes a rotating plate (not shown) rotatable by a rotating shaft parallel to the axis of the forming mechanism 35, and a pocket portion on the outer peripheral portion of the rotating plate capable of holding the can body 11. 39a are provided at equal intervals. These pocket portions 39a are adapted to hold the can body 11 by suction, for example, by vacuum. The above-described forming mechanism 35 is arranged at the position of an arbitrary pocket portion 39a coaxially with the can body 11 held by the pocket portion 39a.
The turret mechanism 39 supplies the work 37 held in the pocket portion 39a to the forming mechanism 35 by rotating the rotating plate, and moves the can 23 formed by the forming mechanism 35 from the forming mechanism 35. Then, it is delivered to the next process.
[0025]
Next, a method of manufacturing the can 23 using the manufacturing apparatus 31 configured as described above will be described.
First, the work 37 on which the can bottom 13 has been formed is supplied between the base 33 and the forming mechanism 35 by the turret mechanism 39 (see FIG. 1).
[0026]
Next, the sliding shaft 602 is moved along the axis of the sliding shaft 602 by the cam 604 of the base moving mechanism 60 and each of the rotating rollers 603, so that the base 33 approaches the forming mechanism 35 side, and the suction passages 605, 606 The upper end of the work 37 is attracted to the contact surface 33a of the base 33 (see the angle P2 from the angle P1 in FIG. 9).
[0027]
As a result, as shown in FIG. 2, the outer walls 17 b and 17 c of the annular convex portion 17 of the workpiece 37 are formed by the protruding portion 41 d of the distal end 41 b of the first punch claw 41 and the distal end surface of the second punch claw 47. The dome portion 15 of the work 37 abuts on the dome support member 45 while abutting against the respective 47d.
[0028]
Subsequently, the moving shaft 620 is moved along the axis thereof by the cam 624 of the operating member moving mechanism 62 and each of the rotating rollers 623, so that the diameter increasing member 43 and the diameter reducing member 49 are brought closer to the workpiece 37.
Thereby, first, the outer peripheral surface 43a of the diameter-enlargement member 43 comes into contact with the inner surface of the tip 41b of the first punch claw 41 (see the angle P3 in FIG. 9), and each tip 41b of the first punch claw 41 is moved. The forming of the inner concave portion 19 is started by pressing the annular convex portion 17 of the work 37 against the inner wall 17b (see FIG. 3).
[0029]
In this case, the urging force of the dome support member 45 urged by the spring 57 against the dome portion 15 of the work 37 increases with the movement of the diameter-enlarging member 43 toward the work 37, and the work 37 comes into contact with the base 33. The dome support member 45 firmly holds the dome. Further, in this state, the tip end surface 45a of the dome support member 45 abuts on the dome portion 15, whereby the deformation of the dome portion 15 in the molding process is regulated. As a result, a dome portion 15 having a desired shape is obtained, and pressure resistance enough to withstand the internal pressure after the contents are enclosed is secured.
[0030]
Further, when the diameter-enlarging member 43 and the diameter-reducing member 49 approach the workpiece 37 by the operating member moving mechanism 62, the inclined surface 49a on the inner surface of the distal end of the diameter-reducing member 49 becomes the inclined surface on the outer periphery of the distal end of the second punch claw 47. By contacting the outer surface 17d of the second punch claw 47, the formation of the outer concave portion 22 in the outer wall 17c of the annular convex portion 17 of the work 37 is started (see the angle P4 in FIG. 9).
[0031]
Next, when the cam angle in FIG. 9 reaches the angle P5, the forming of the concave portions 21 and 22 by the punch claws 41 and 47 is completed (see FIG. 4).
Subsequently, by the operating member moving mechanism 62, the diameter increasing member 43 and the diameter reducing member 49 start retreating in a direction away from the workpiece 37 side. The force pressing the tip 47b of the second punch claw 47 inward in the radial direction (the work 37 side) is released, and the tip 47b of the second punch claw 47 returns radially outward due to its elastic force.
[0032]
Furthermore, the distal end 41b of the first punch claw 41 is pressed radially outward (toward the workpiece 37) by the diameter-enlargement member 43 separating from the first punch claw 41 (see the angle P6 in FIG. 9). The force is released, and the tip 41b of the first punch claw 41 returns inward in the radial direction by its elastic force.
Further, the dome support member 45 urged by the spring 57 remains at the position and continues to press the work 37 irrespective of the retreat of the diameter-enlarging member 43.
[0033]
Next, when the cam angle in FIG. 9 reaches the angle P6, the retracting operation of the expanding member 43 and the reducing member 49 by the operating member moving mechanism 62 temporarily stops, and the retracting operation of the base 33 by the base moving mechanism 60 starts. I do. Thereby, the work 37 moves in the direction away from the tips 41b, 47b of the punch claws 41, 47 together with the base 33.
[0034]
At this time, even if the work 37 and the tips 41b, 47b of the punch claws 41, 47 do not separate from each other for some reason, the dome support member 45 urged by the spring 57 causes the work 37 and the Since the work 37 is pressed so as to separate it from the tips 41b, 47b of the punch claws 41, 47, the work 37 is smoothly separated from the tips 41b, 47b of the punch claws 41, 47 and the original position together with the base 33. (See angle P7 in FIGS. 6 and 9).
[0035]
Subsequently, when the cam angle in FIG. 9 reaches the angle P7, the retreating operation of the expanding member 43 and the reducing member 49 by the operating member moving mechanism 62 is resumed, and the expanding member 43 and the reducing member 49 are restored to the original state. The dome support member 45 also retreats from the work 37 side and returns to the initial position along with the retraction of the diameter increasing member 43 (see the angle P8 in FIG. 9).
Thus, the forming of the inner concave portion 21 and the outer concave portion 22 in the can bottom 13 is completed.
[0036]
The can 23 in which the formation of the concave portions 21 and 22 has been completed moves from between the base 33 and the forming mechanism 35 by rotating the rotating plate of the turret mechanism 39 and is transferred to the next step. Thus, the concave portions 21 and 22 are easily formed in the can bottom 13. Here, each of the punch claws 41 and 47 can be easily manufactured only by performing slit processing on the distal end side of an integrated steel cylinder. Therefore, the mechanism is simple, maintenance is easy, and the movement of the punch claws 41, 47 in the radial direction is due to the elastic deformation thereof, so that the operation is reliable and can be used stably for a long period of time. .
[0037]
In the above-described embodiment, the base 33 is retracted after the recesses 21 and 22 are formed and the retracting of the diameter-enlarging member 43 and the diameter-reducing member 49 from the workpiece 37 is temporarily stopped. The invention is not limited thereto, and the retraction of the base 33 may be started in a state where the retraction of the diameter-enlarging member 43 and the diameter-reducing member 49 from the workpiece 37 is continued.
[0038]
In the can 23 manufactured in this manner, the inner wall 17b has the plurality of inner recesses 21 formed in the circumferential direction, and the outer wall 17c has the plurality of outer recesses 22 formed in the circumferential direction. Thus, the rigidity of each part of the can bottom 13 is increased.
[0039]
Of these, the inner concave portion 21 is provided to oppose the internal pressure after the contents are enclosed, thereby preventing the vicinity of the inner wall 17b from expanding outward without being able to withstand the internal pressure. Will be. Further, since the outer concave portion 22 is formed in the outer wall 17c, it is possible to sufficiently oppose the internal pressure after the contents are enclosed, and the outer wall 17c is reliably prevented from bulging outward. become.
[0040]
Note that, in the above-described embodiment, the description has been made in the form in which the inner concave portion 21 is provided in the inner wall 17b. However, the present invention is not limited to this, and the inner concave portion may be formed in the peripheral portion of the dome portion 15.
The inner concave portion formed in the peripheral portion of the dome portion 15 contributes to the improvement of the drop strength. That is, in the conventional can, the peripheral portion of the dome portion 15 swells due to the impact at the time of dropping, and in the worst case, it is damaged. However, the inner recess 21 is formed, so that it is vulnerable to the impact at the time of dropping. The rigidity of the peripheral portion of the dome portion 15 which is a portion is increased, and the drop strength is greatly improved.
Further, the inner concave portion may be formed from the inner wall 17b to the dome portion 15, or may be formed of a portion from the inner wall 17b contributing to an improvement in pressure resistance and a peripheral portion of the dome portion 15 contributing to an improvement in drop strength. The molding may be divided into two concave portions.
[0041]
Furthermore, although the outer concave portion 22 has been described as being provided on the outer wall 17c, an outer concave portion is provided on the convex curved surface portion 20, which is a boundary portion between the outer wall 17c and the can body 11, in addition to the outer concave portion 22. Is also good. In this case, the vertical load applied from above when the cans are stacked can be reliably counteracted, and no deformation or the like occurs.
Furthermore, a configuration in which the outer concave portions 22 and 24 are formed into one outer concave portion, that is, a configuration in which an outer concave portion extending from the outer wall 17c to the boundary portion (convex curved surface portion 20) with the can body 11 may be formed. In addition, the inner concave portion 21 and the outer concave portion 22 are illustrated to be at alternate positions as shown in FIG. 11, but the present invention is not limited to this, and a configuration in which the inner concave portion 21 and the outer concave portion 22 are formed to face each other with the nose portion 17a interposed therebetween is also possible. Good.
[0042]
Further, the shapes, the numbers, and the arrangement of the concave portions 21 and 22 are not limited to the present embodiment.
That is, the shape of each of the concave portions 21 and 22 may be other polygons other than a quadrangle, a circle, or the like. The number of the recesses 21 and 22 may be optimally set so as to increase the rigidity of the can bottom in consideration of the width of the recesses 21 and 22 in the circumferential direction and the pitch between the recesses 21 and 22.
Further, as for the arrangement of the recesses 21 and 22, instead of the configuration in which the recesses 21 and 22 are arranged at predetermined intervals as in the present embodiment, the gaps between the recesses 21 and 22 are not provided. Each recess 21 or each recess 22 may be formed continuously.
[0043]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the position of the punch claw is fixed, and the can body supported by the base is first approached to this punch claw, so that the tip of the punch claw is moved. Radially inward from the nose of the annular projectionHalfAbuts the radially outer area, and thenShrinkageActivate the diametric member to increase theseShrinkageAfter the tip of the punch claw is moved in the radial direction by a diameter member to form a recess in the bottom of the can, the diameter expansion member andShrinkageBy retracting the diameter member and pulling the can body supported by the base away from the punch claws, the can bottom can be processed smoothly and reliably. Therefore, it is possible to reduce the thickness of the can, in particular, the thickness of the can bottom, and to easily produce a can capable of ensuring sufficient can strength without causing deformation of the can bottom and its peripheral portion. be able to.
[0044]
According to the second aspect of the present invention, the base is brought into contact with the upper end of the can body, and the air in the can body is sucked, thereby adsorbing the can body to the base and firmly fixing the can body to the base. And can be smoothly transferred with the base.
[0045]
According to the third aspect of the present invention, the base is moved closer to the punch claw together with the can body by the base moving mechanism, the tip of the punch claw contacts the bottom of the can, and the dome support member contacts the dome portion, The can body was sandwiched between the base and the dome support member, and the operating member was moved by the operating member moving mechanism, and the tip of the punch claw was moved in the radial direction by the operating member to form a recess in the bottom of the can. Thereafter, by sequentially operating the two moving mechanisms, the operating member is retracted from the punch claw, and the base is separated from the punch claw together with the can body. Processing for forming a concave portion can be performed.
According to the third aspect of the present invention, a concave portion is formed in a region radially inside the nose portion by a combination of a punch claw and a diameter-enlarging member that abut on a region radially inside the nose portion of the annular convex portion. A concave portion can be formed in a region radially outside the nose portion by a combination of a punch claw and a diameter reducing member that abuts on a region radially outside the nose portion of the annular convex portion. . Therefore, a concave portion of a desired shape can be easily formed in a region radially inside and radially outside of the nose portion with the nose portion of the annular convex portion of the can bottom as a boundary, and a thin wall having sufficient strength is secured. Cans can be manufactured smoothly.
[0046]
According to claim 4 of the present invention, since both the base moving mechanism and the operating member moving mechanism are cam mechanisms, the base moving mechanism and the operating member moving mechanism are smoothly operated along the cam surface, and according to a preset cam angle (timing). The base and the operating member can be reliably reciprocated. Therefore, cans can be manufactured accurately and quickly.
[0048]
Claims of the invention5According to the above, by suctioning the internal air from the upper end of the can body in contact with the base by the suction means, the can body can be firmly adsorbed to the base, and the can body can be smoothly moved together with the base. Can be.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an initial state of an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which can body movement (forward) is completed.
FIG. 3 is a sectional view showing a state immediately before the start of can bottom forming.
FIG. 4 is a sectional view showing a state at the time of completion of can bottom forming.
FIG. 5 is a sectional view showing a state when a mold is opened.
FIG. 6 is a cross-sectional view showing a state where the can body retreat is completed.
FIG. 7 is a cross-sectional view showing a base moving mechanism.
FIG. 8 is a sectional view showing an operating member moving mechanism.
FIG. 9 is an explanatory diagram showing a moving state of a base and an operation member.
FIG. 10 is a side view of a main part showing an example of a can.
FIG. 11 is a plan view of the can of FIG. 10 viewed from the bottom side.
FIG. 12 is a side view in which the bottom of a conventional can is sectioned.
[Explanation of symbols]
11 can body
13 Can bottom
15 Dome
17 Annular convex
17a Nose section
17b Inner wall (inner wall)
17c Outer wall (outer wall)
21 Inside recess
22 Outer recess
23 cans
31 Manufacturing Equipment
33 base
33a contact surface
35 Forming mechanism
37 cans (work)
41 First punch nail
41b tip
43 Expanding member (operating member)
45 Dome support member
47 Second punch nail
47b tip
49 Reduced diameter member (operating member)
60 base moving mechanism
62 Actuating member moving mechanism

Claims (5)

On the bottom of the can, a dome portion recessed toward the inside of the can body is formed, and when manufacturing a can having a configuration in which an annular convex portion protruding outward in the axial direction of the can is formed on the periphery of the dome portion, the circumferential direction is reduced. to the tip of the movable punch nail plurality radial, as a boundary the nose portion of the tip of the annular projection, in contact with the radially inner and semi radial outer region than the nose portion, radially inwardly and semi radial outer region than the nose portion by moving in a radial direction of the tip of the punch pawl by the enlarged diameter member and reduced diameter member, a recess which is recessed to the inner side of the can body A method for producing a plurality of cans formed in a circumferential direction,
The upper end of the can body supplied by a rotary plate having a plurality of pocket portions on the outer peripheral portion for holding the can body by suction is brought into contact with the base to support the can body by the base, and the can body supported by the base is is brought closer to the punch nails, the tip of the punch pawl comes into contact with the radially inner and semi radial outer region than the nose portion of the annular projection, then the enlarged diameter member and reduced diameter member is advanced by moving the tip of the punch pawls radially, after forming a recess in the can bottom, with retracting the enlarged diameter member and reduced diameter member, it is supported on the base can body A method for producing a can, comprising: separating a can from a tip of a punch claw. The method for manufacturing a can according to claim 1, wherein the can body is supported by adsorbing an upper end of the can body to a base. A manufacturing apparatus for manufacturing a can having a configuration in which a dome portion recessed toward the inside of the can body is formed on the bottom of the can, and an annular convex portion protruding outward in the axial direction of the can is formed on the periphery of the dome portion,
A rotating plate having a plurality of pocket portions on the outer peripheral portion for suction holding the can body,
A base for supporting the can body by contacting the upper end of the can body;
A plurality of radially movable tips are provided in the circumferential direction in contact with the radially inner and radially outer regions from the nose portion of the annular projection, and the tips are arranged so as to protrude toward the base direction. And a punch claw provided so as to be able to move back and forth in the can axis direction of the can body supported by the base,
The punch claw is provided so as to be able to move back and forth in the can axis direction of the can body, and a diameter-enlarging member that moves the tip of the punch claw radially outward and a diameter-reducing member that moves the tip of the punch claw radially inward. An operating member comprising a member,
A dome support member is provided inside the punch claw and the operating member so as to be movable back and forth in the can axis direction of the can body, and abuts against and supports the dome portion.
A base moving mechanism that is provided on the base and moves the base back and forth in the can axis direction of the can body;
An operating member moving mechanism provided on the operating member for moving the operating member back and forth in the can axis direction of the can body; The can manufacturing apparatus according to claim 3, wherein the base moving mechanism and the operating member moving mechanism are constituted by a cam mechanism. 5. The can manufacturing apparatus according to claim 3, wherein a suction means for sucking the inside of the can body is provided on the base.

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