JP2016030266A - Manufacturing method and manufacturing apparatus of square container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus of a square container capable of forming the square container while preventing wrinkles or cracks from occurring.SOLUTION: A manufacturing method of a square container includes: a folding process for folding a metal sheet 2 to form a tray-shaped primary formed body 50 having a square bottom surface 51; and a drawing process for drawing the primary formed body 50 to form the square container. Therein, in the folding process, the metal sheet 2 is folded to form corner parts 53 and edge parts 52 on the bottom surface 51 of the primary folded body 50 and, at the same time, an opening angle of a side surface 54 of the primary formed body 50 ranging to the edge part 52 is set to be larger toward a center part of the edge part 52 from the corner parts 53 and, in the drawing process, the corner parts 53 and the edge parts 52 of the primary formed body 50 are drawn to form the corner parts of the square container and, at the same time, while liberating material to the center side of the edge parts, the side surfaces of the square container are drawn toward the center part around the corner parts as the centers.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for manufacturing a rectangular container by forming a metal plate.

  Usually, when a metal container is formed, it is often formed by drawing using a drawing apparatus. In this drawing process, it is widely used to produce a bottomed cylindrical container such as a beverage can. However, when a rectangular container is formed by drawing, the material tends to gather particularly near the corner of the bottom side. Wrinkles and cracks are likely to occur at the corners. For this reason, only a tray-shaped square container having a shallow depth relative to the flat area could be formed.

  As a method of manufacturing a rectangular container by this drawing process, for example, the square drawing process disclosed in Patent Document 1 is disclosed. In this processing method, a temperature control heater is embedded in a drawing punch and a die plate, and drawing is performed by warm press processing in which a plate material is heated and formed. It is considered that the moldability is improved by heating the material.

JP 2002-239644 A

  However, in the case of the method described in Patent Document 1, it is necessary to embed heating means in the mold. In addition, this processing method is to prevent cracks and cracks by forming a thick plate at the corners of materials such as magnesium materials that have low elongation and low drawability. It is difficult and it is necessary to consider a proper mold shape.

  This invention is made | formed in view of such a situation, and it aims at providing the manufacturing method and manufacturing apparatus of a square container which can shape | mold a square container, preventing generation | occurrence | production of a wrinkle or a crack.

  The method for manufacturing a rectangular container according to the present invention includes a bending process for forming a tray-shaped primary molded body having a rectangular bottom surface by bending a metal plate, and a rectangular container is formed by drawing the primary molded body. In the bending process, the metal plate is bent to form corners and sides on the bottom surface of the primary molded body, and the opening angle of the side surface of the primary molded body connected to the side parts is In the drawing process, the corners and sides of the primary molded body are drawn to form the corners of the rectangular container while the sides are enlarged from the corners toward the center of the sides. While the material is released to the center side of the part, the side surface of the square container is drawn and formed with the corner part at the center toward the center part.

  In addition, the square container manufacturing apparatus of the present invention includes a bending mold for forming a tray-shaped primary molded body having a rectangular bottom surface by bending a metal plate, and a rectangular container by drawing the primary molded body. And the bending mold is configured such that the corners and sides on the bottom surface of the primary molded body are between the pyramid-shaped upper mold convex part and the bottom part of the upper mold convex part. A lower mold having a concave portion to be molded, and the concave portion has an opening angle of a side surface of the primary molded body that is continuous with the side portion so as to increase from the corner portion toward a central portion of the side portion. A taper surface to be molded is formed, and the drawing die includes an upper punch that squeezes the primary molded body from the bottom, and a lower die having a drawing hole that fits the upper punch. On the die, the side surface of the primary molded body is placed above the drawing hole. Tapered guide surface of the inner is formed in the opening angle is smaller than the opening angle of the tapered surface in the bending mold.

  First, a metal plate is bent to form a tray-shaped primary molded body in which the corners and sides of the bottom of the rectangular container are molded, and then the corners are shaped and positioned while the sides are being positioned. The side surface of the rectangular container is formed by drawing toward the center of the part. Therefore, it is difficult for the material to gather at the corners, and the drawing can be continued while letting the materials escape from the corners. Thereby, it is hard to produce a wrinkle and a crack in a corner | angular part, and a high quality square container can be shape | molded.

  In the rectangular container manufacturing apparatus according to the present invention, the lower die of the drawing-processed die is formed so that a relief taper surface having a larger opening angle than the tapered guide surface is continuous with an upper end of the tapered guide surface. It is good to be.

  During drawing, the side of the primary molded body is drawn while being guided by the tapered guide surface, and the side that is deformed by drawing has a larger opening angle than the tapered guide surface, and the central portion side escapes to the tapered surface. Therefore, the rectangular container can be processed while preventing the material from gathering at the corner by forming the corner toward the center of the side portion.

  According to the manufacturing method and the manufacturing apparatus of the rectangular container of the present invention, forming is performed while escaping the material from the vicinity of the corner of the metal plate by two steps of bending and drawing, thereby preventing generation of wrinkles and cracks. A rectangular container can be formed while doing so.

It is a perspective view which shows the front | former stage of the manufacturing method of the square container of one Embodiment of this invention in process order. It is a perspective view which shows the back | latter stage of a manufacturing process in order of a process. It is a perspective view which shows the bending process type | mold in the manufacturing apparatus of a square container. It is a top view of the lower mold | type of FIG. It is sectional drawing which follows the AA line of FIG. It is a perspective view which shows the state which mounted the metal plate on the lower mold | type of FIG. FIG. 4 is a perspective view of an upper mold and a lower mold during bending in the bending mold of FIG. 3. It is a perspective view which shows the state which extruded the primary molded object from the lower mold | type after the bending process. It is a perspective view which shows the drawing process type | mold in the manufacturing apparatus of a square container. FIG. 10 is a plan view of the lower die of FIG. 9. It is sectional drawing of the drawing type along a BB line of FIG. FIG. 10 is a perspective view showing a state in which a primary molded body is arranged in the drawing die of FIG. 9. It is a perspective view of an upper punch and a lower die during drawing. It is a perspective view which shows the state which extruded the square container after drawing from a lower die | dye.

Hereinafter, embodiments of a method for manufacturing a rectangular container and a manufacturing apparatus of the present invention will be described with reference to the drawings.
The rectangular container 1 manufactured in this embodiment has a bottom surface formed in a square shape and a side surface formed substantially vertically by a metal plate 2 such as aluminum. And in the manufacturing method of this square container 1, the press apparatus which has two types of metal molds, the bending process type | mold 10 shown in FIGS. 3-5, and the drawing process type | mold 30 shown in FIGS. 9-11 is used. Then, the metal plate 2 is subjected to two stages of bending and drawing.

3 to FIG. 5, the metal plate 2 is bent between the convex portion 12 of the upper die 11 and the concave portion 22 of the lower die 21, and the corner portions 3 and sides of the four corners on the bottom surface of the square container 1. The tray-shaped primary molded body 50 that forms the initial shape of the portion 4 is molded.
As shown in FIG. 3, the convex portion 12 of the upper mold 11 is formed in a pyramid shape extending from the lower portion toward the upper portion, the side portion forming portion 14 is provided by the four sides of the bottom surface, and the bottom surface includes the bottom surface and the four corners. The apex corner portion 16 is formed by the two tapered side surfaces 15, the side portion 14 is bent at the bottom portion of the rectangular container 1, and the bottom portion is bent by the corner portion 16. The portion to be the corner 3 can be bent.

  In the center of the recess 22 of the lower mold 21 shown in FIGS. 4 and 5, a square hole 23 having substantially the same shape as the bottom surface of the square container after manufacture is provided. A plurality of tapered surfaces 24 are formed on the outer peripheral side of the upper end of the rectangular hole 23 so as to gradually spread in the horizontal direction (X direction and Y direction in FIG. 3) as it goes upward. Two of these tapered surfaces 24 are provided on each side 25 of the square hole 23, arranged one by one from the central part of each side 25 to the corner part 26, and abutted at the central part of the side 25. . The tapered surfaces 24 are formed in a twisted shape so that the opening angle from the central portion of the side 25 is larger than the opening angle from the corner portion 26. Further, the upper ends of the respective taper surfaces 24 are respectively formed so as to be continuous with the second taper surfaces 27 whose opening angles are further increased toward the upper side, and these second taper surfaces 27 have a groove shape with a V-shaped cross section. ing.

In addition, in the corner portion 26, two tapered surfaces 24 arranged at right angles at the upper end of the square hole 23 are joined together via a ridge line 28 extending upward from the corner portion 26. It spreads at substantially the same angle or slightly larger than the ridgeline 17 of the pyramid surface extending from the corner forming portion 16 of the mold 11. The concave portion 22 is formed by the tapered surface 24 and the second tapered surface 27.
3 indicate guide posts and guide holes for positioning the upper mold 11 and the lower mold 21, and reference numeral 37 in FIG. 4 indicates two sides of the rectangular metal plate 2 on the lower mold 21. The guide pin for positioning is shown.

  In addition, a receiving member 29 formed in the shape of a prism having substantially the same shape as the rectangular hole 23 is provided in the rectangular hole 23 below the concave portion 22 so as to be vertically movable. By this receiving member 29, the metal plate 2 is supported from the bottom side when the metal plate 2 is bent, and the corner portion 53 can be reliably formed by the corner portion forming portion 16 when the upper die 11 is pressed. In this case, the receiving member 29 is moved up and down from the state protruding above the rectangular hole 23 to the same level as the upper surface of the lower mold 21 to the upper end surface of the rectangular hole 23.

  As shown in FIG. 1 (b), the primary molded body 50 molded by the bending die 10 is formed with side portions 52 and four corner portions 53 surrounding the four sides on the bottom surface 51. In this case, two inclined side surfaces 54 and a relief portion 55 therebetween are formed on one side portion 52. Each inclined side surface 54 is formed so that the opening angle at the center portion of the side portion 52 is larger than the opening angle from the corner portion 53.

  On the other hand, the drawing mold 30 shown in FIGS. 9 to 11 is formed by drawing the bent primary molded body 50 between the punch 32 of the upper mold 31 and the lower die 41 to form the rectangular container 1. It is. The punch 32 is formed in a substantially prismatic shape that can squeeze the primary molded body 50 from the bottom.

  The lower die 41 is provided with a drawing hole 42 into which the punch 32 is fitted and a guide recess 43. A tapered guide surface 44 for guiding the side surface of the primary molded body 50 is formed above the draw forming hole 42 of the die 41, and the tapered guide surface 44 is drawn like the tapered surface 24 of the bending die 10. Two holes are provided on each side 45 of the hole 42, arranged one by one from the central part of each side 45 to the corner part 46, and abutted at the central part of the side 45. The tapered guide surfaces 44 are formed in a twisted shape so that the opening angle from the central portion of the side 45 is larger than the opening angle from the corner portion 46. However, the opening angle of each tapered guide surface 44 is set smaller than that of the tapered surface 24 of the bending die 10.

Further, the upper end of the taper-shaped guide surface 44 is formed with a relief taper surface 47 that is further inclined in the upward direction, and the relief taper surface 47 has a groove shape with a V-shaped cross section. There is no.
Further, the ridgeline 48 formed by the two tapered guide surfaces 44 at the corner 46 is also set to have a smaller opening angle than the ridgeline 28 of the recess 22 of the bending die 10.
The aforementioned guide recess 43 is formed by the tapered guide surface 44 and the relief taper surface 47.
Further, a receiving member 49 is provided in the drawing hole 42 so as to be movable up and down. From the state in which the receiving member 49 protrudes above the drawing hole 42 to the same level as the upper end surface of the lower die 41, It is moved up and down to a height position that can support the bottom surface of the rectangular container 1 that is drawn and pushed inside.

On the other hand, a frame-shaped guide member 60 is provided on the outer peripheral side of the punch 32 so as to be vertically movable by a guide rod 61 and urged downward by an urging member such as a spring (not shown). On the four sides of the bottom surface 60, a pressing portion 62 that presses the side portion 52 and the corner portion 53 of the bottom surface of the primary molded body 50 is formed in a rectangular shape, and a tapered surface 63 is formed above the pressing portion 62. . The tapered surface 63 is provided with a steeper slope than the tapered guide surface 44 of the guide recess 43, and the guide member 60 is provided in a shape that can be engaged with the inside of the tapered guide surface 44 from above.
The drawing die 30 is also provided with a guide post 35 and a guide hole 36 for positioning the upper punch 32 and the lower die 41, similarly to the bending die 10.

When manufacturing a rectangular container with the manufacturing apparatus having the above-described configuration, first, a primary molded body 50 is formed by bending using the bending mold 10, and the primary molded body 50 is drawn by using the drawing mold 30. Molded into a square container 1.
In the bending process, as shown in FIG. 6, the metal plate 2 is placed above the recess 22 of the lower mold 21. At this time, since the lower mold 21 is provided with the guide pin 37, the alignment is performed in a state where the peripheral edge of the metal plate 2 is in contact with the guide pin 37. Then, when the convex portion 12 of the upper mold 11 is lowered, the convex portion 12 engages in the concave portion 22 while sandwiching the metal plate 2 between the concave portion 22 of the lower mold 21 as shown in FIG. At that time, the metal plate 2 is bent by the side portion forming portion 14 and the corner portion forming portion 16 to form the primary molded body 50 in which the side portion 52 and the corner portion 53 are formed on the bottom surface.

  At this time, by supporting the metal plate 2 from the bottom surface side by the receiving member 29 of the lower mold 21, the entire bottom surface of the convex portion 12 contacts the metal plate 2, and the side portion forming portion 14 and corners of the convex portion 12 are contacted. The side portion 52 and the corner portion 53 can be reliably bent and formed on the metal plate 2 by the portion forming portion 16. And in the upper part of these side parts 52 and the corner | angular part 53, the inclined side surface 54 is formed so that the taper surface 24 of the recessed part 22 of the lower mold | type 21 may be formed, and the surplus material between the inclined side surfaces 54 in each side part 52 Thus, the escape portion 55 is formed.

The primary molded body 50 after the bending process is taken out from the bending mold 10, and the primary molded body 50 is drawn by the drawing mold 30 as shown in FIGS.
As shown in FIG. 12, when the primary molded body 50 is disposed in the guide recess 43 of the die 41 and the upper mold 31 is lowered, the guide member 60 enters the primary molded body 50. Since the tapered surface 63 of the guide member 60 is steeper than the inclined side surface 54 of the primary molded body 50, the tapered surface 63 does not contact the inner side surface of the primary molded body 50 at this stage.

When the upper die 31 is further lowered, the guide member 60 comes into contact with the primary molded body 50, so that further lowering is restricted, and the punch 32 is lowered and fitted into the drawing hole 42. The primary compact 50 is drawn.
At this time, the inclined side surface 54 of the primary molded body 50 is first drawn into the guide concave portion 43 of the lower die 41 by the guide member 60 and is bent so as to be along the tapered guide surface 44 of the guide concave portion 43 ( 1 (c) to 1 (d)), the punch 32 is subsequently drawn into the drawing hole 42 (FIGS. 2 (a) to 2 (d)). Since the taper-shaped guide surface 44 is formed such that the opening corner portion is smaller at the corner portion and larger at the center portion of the side, as shown in FIGS. 1C to 2C in order. Further, as the punch 32 is lowered, the corner portion 3 is first squeezed first, and the corner portion 3 is sequentially molded upward from the lower portion, while the formed corner portion 3 is made to follow this in a fixed state. Drawing is performed while letting the material between the corners 3 escape toward the center of the side 4. In FIG. 1 (c) to FIG. 2 (c), for the sake of convenience, the state in the middle of molding is referred to as a primary molded body for the primary molded body 50 in FIG.

In the stage shown in FIG. 1C and FIG. 1D, the corner 53 and the side 52 of the primary molded body 50 'are further molded, and the inclination angle of the inclined side surface 54 is gradually reduced on the side surface. . When the punch 32 enters the drawing hole 42 of the lower die 41, the corner 53 of the primary molded body 50 ′ is formed into the shape of the corner 3 of the square container 1, and the side 52 is also square. Molded on the side 4 of the mold container 1. Then, as shown in FIG. 2 (a), after the corner 3 and the side 4 of the rectangular container 1 are formed in the lower part of the primary molded body 50 ', FIG. 2 (b) to FIG. 2 (d). As shown in FIG. 5, the rectangular container 1 is formed by releasing the material from the corner 3 toward the center of the side surface. In the guide recess 43 of the lower die 41, a relief taper surface 47 is formed at the upper end of the taper-shaped guide surface 44, so that the material approaching the center portion escapes along the taper surface 47 and the center upper end of the side surface 56. A pair of inclined surfaces 57 are formed so as to form a pyramid shape at the portion, and the inclined surfaces 57 are gradually reduced to finally form the side surface 5 of the rectangular container 1 shown in FIG. The
After the molding of the square container 1, when the upper mold 31 is raised, the receiving member 49 of the lower mold die 41 is raised, the square container 1 is pushed up from the drawing hole 42, and is removed from the drawing mold 30. It becomes possible.

  As described above, according to this manufacturing method, the inclined side surface 54 connected to the side portion 52 is first bent by bending the portions (corner portion 53 and side portion 52) that become the corner portion 3 and the side portion 4. A primary molded body 50 having a larger opening angle from the corner portion 53 toward the central portion of the side portion 52 is formed. Thereby, the load added to the metal plate 2 can be reduced, and the corner portion 53 and the side portion 52 can be forcibly formed and the positional relationship thereof can be fixed. Subsequently, the corner portion 53 of the primary molded body 50 is drawn by drawing to finish the corner portion 3 of the rectangular container 1, and the side surface is centered on the corner portion 3 while releasing the material to the center side of the side portion 52. By drawing toward the center, the side surface can be formed while preventing the inflow of material in the direction of the corner 3. Thus, the square container 1 can be shape | molded without generating a crack and a wrinkle by the corner | angular part 3 vicinity by giving the metal plate 2 the bending process and drawing process by drawing.

  When a container is manufactured by the manufacturing method of the present invention, the shape is not limited to a square shape with a square bottom, and other polygonal rectangular tube containers can be formed. Various materials other than aluminum can also be used, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Square container 2 Metal plate 10 Bending processing type 11 Upper mold 12 Protruding part 14 Side part forming part 15 Tapered side face 16 Corner part forming part 17 Ridge line 21 Lower mold | type 22 Recessed part 23 Square hole 24 Tapered surface 25 Side 26 Corner part 27 Second taper surface 28 Ridge line 29 Receiving member 30 Drawing die 31 Upper die 32 Punch 37 Guide pin 41 Die 42 Drawing hole 43 Guide recess 44 Tapered guide surface 45 Side 46 Corner portion 47 Tapered surface 48 Ridge line 49 Receiving member 50 Primary Molded body 51 Bottom surface 52 Side portion 53 Corner portion 54 Inclined side surface 55 Escape portion 56 Side surface 57 Inclined surface 60 Guide member 62 Holding portion 63 Tapered surface

Claims (3)

  A folding process for forming a tray-shaped primary molded body having a rectangular bottom by bending a metal plate, and a drawing process for forming a rectangular container by drawing the primary molded body. The metal plate is bent to form the corners and sides on the bottom surface of the primary molded body, and the opening angle of the side surface of the primary molded body connected to the side parts is directed from the corners to the central part of the side parts. In the drawing process, the corners and sides of the primary molded body are drawn to form the corners of the rectangular container, and the corners are released while the material is released to the center of the sides. A method for producing a rectangular container, characterized in that the rectangular container is drawn and formed with the side face of the central part toward the central part.   A folding processing mold for forming a tray-shaped primary molded body having a rectangular bottom by bending a metal plate; and a drawing mold for drawing the primary molded body to form a rectangular container. The processing mold is provided with a lower mold having a concave portion that forms a corner and a side portion of the bottom surface of the primary molded body between the pyramid-shaped upper mold convex portion and the bottom surface portion of the upper mold convex portion, and In the concave portion, a tapered surface is formed so that an opening angle of a side surface of the primary molded body connected to the side portion is increased from the corner portion toward a central portion of the side portion. An upper punch that squeezes the primary molded body from the bottom, and a lower die having a drawing hole that fits the upper punch, and the lower die includes the upper die above the drawing hole. The tapered guide surface that guides the side surface of the primary molded body is bent. That it is formed by open angle is smaller than the opening angle of the tapered surface of the working mold square container manufacturing apparatus according to claim. The lower die according to claim 2, wherein a relief taper surface having an opening angle larger than that of the tapered guide surface is formed to be continuous with an upper end of the tapered guide surface. The manufacturing apparatus of the square container of description.

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