JP2013233574A - Device for molding bottomed container - Google Patents

Device for molding bottomed container Download PDF

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JP2013233574A
JP2013233574A JP2012108008A JP2012108008A JP2013233574A JP 2013233574 A JP2013233574 A JP 2013233574A JP 2012108008 A JP2012108008 A JP 2012108008A JP 2012108008 A JP2012108008 A JP 2012108008A JP 2013233574 A JP2013233574 A JP 2013233574A
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long side
punch
short side
molding material
path
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Yoshinori Miyazaki
吉則 宮崎
Tomonori Yamada
知仙 山田
Katsuhiro Kajikawa
勝弘 梶川
Toshikazu Ito
敏和 伊藤
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FTS Co Ltd
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FTS Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent defective molding from occurring on the wall of the long side of a bottomed container.SOLUTION: On an outer face 22L of the long side of a punch 20, a long side path 27L is structured to raise a workpiece 35 to be molded, between the outer face 22L and the inner face of a cavity 11, and a slidingly contacting face 25L of the long side is formed to make the rising workpiece 35 to be molded contact slidingly. On the outer face 22S of the short side of the punch 20, a short side path 27S is structured to raise the workpiece 35 to be molded, between the outer face 22S and the inner face of the cavity 11, and a slidingly contacting face 25S of the short side is formed to make the rising workpiece 35 contact slidingly. The height of the long side slidingly contacting face 25L on the basis of the bottom pressing face 21 is minimal at both longitudinal ends in the direction of the length of the outer face 22L of the long side and increases toward the center in the direction of the length of the outer face of the long side.

Description

本発明は、有底容器の成形装置に関するものである。   The present invention relates to an apparatus for forming a bottomed container.

特許文献１には、被成形材を収容するためのキャビティが形成されたダイスと、キャビティ内への進入可能に設けたパンチとを備え、パンチの底面で衝撃的に押圧した被成形材を、キャビティの内側面とパンチの外側面との隙間において押圧方向と反対方向へ立ち上がるように塑性変形させることにより、底面形状が略長方形をなす有底容器を成形する成形装置が開示されている。   Patent Document 1 includes a die formed with a cavity for accommodating a molding material, and a punch provided so as to be able to enter the cavity, and the molding material pressed impactively on the bottom surface of the punch, There has been disclosed a molding apparatus for molding a bottomed container having a substantially rectangular bottom shape by plastically deforming so as to rise in a direction opposite to the pressing direction in a gap between the inner side surface of the cavity and the outer side surface of the punch.

特許第３３００２９６号公報Japanese Patent No. 3300266

上記のようにパンチの衝撃的な押圧力で被成形材を立ち上げて底面形状が略長方形をなす有底容器を成形する場合、有底容器を構成する長辺側壁部と短辺側壁部のうち長辺側壁部だけに割れや皺等の成形不良が生じることがある。このような成形不良の発生は、壁部の壁厚が薄いほど、顕著である。
本発明は上記のような事情に基づいて完成されたものであって、有底容器の長辺側壁部における成形不良の発生を防止することを目的とする。 When forming a bottomed container whose bottom shape is substantially rectangular by raising the material to be molded by the impact pressure of the punch as described above, the long side wall part and the short side wall part constituting the bottomed container Of these, molding defects such as cracks and wrinkles may occur only on the long side wall portion. The occurrence of such molding defects is more remarkable as the wall thickness is thinner.
This invention is completed based on the above situations, Comprising: It aims at preventing generation | occurrence | production of the molding defect in the long side wall part of a bottomed container.

本発明は、
被成形材を収容するための上面開放のキャビティが形成されたダイスと、
前記ダイスの上方から前記キャビティ内への進入を可能に設けたパンチとを備え、
前記パンチの底部押圧面によって衝撃的に押圧した前記被成形材を、前記キャビティと前記パンチとの隙間において押圧方向と反対方向へ立ち上げながら塑性変形させることにより、底面形状が略長方形をなす有底容器を成形する成形装置であって、
前記パンチの長辺側外側面には、前記キャビティの内側面との間に前記被成形材を立ち上げるための長辺側経路を構成するとともに、立ち上がる前記被成形材を摺接させる長辺側摺接面が形成され、
前記パンチの短辺側外側面には、前記キャビティの内側面との間に前記被成形材を立ち上げるための短辺側経路を構成するとともに、立ち上がる前記被成形材を摺接させる短辺側摺接面が形成され、
前記底部押圧面を基準とする前記長辺側摺接面の高さ寸法は、前記長辺側外側面の長さ方向両端部で最小であり、前記長辺側外側面の長さ方向中央に向かって大きくなっているところに特徴を有する。 The present invention
A die formed with a cavity having an open top surface for accommodating a molding material;
A punch provided to allow entry into the cavity from above the die,
The bottom material has an approximately rectangular bottom shape by plastically deforming the material to be molded, which has been shockedly pressed by the bottom pressing surface of the punch, while rising in a direction opposite to the pressing direction in the gap between the cavity and the punch. A molding device for molding a bottom container,
The long side side outer surface of the punch forms a long side path for raising the molding material between the inner side surface of the cavity and the long side side where the rising molding material slides. A sliding surface is formed,
The short side of the short side of the punch forms a short side path for raising the molding material between the inner side of the cavity and the short side of the rising material to be slidably contacted A sliding surface is formed,
The height dimension of the long side slidable contact surface with respect to the bottom pressing surface is minimum at both ends in the length direction of the long side outer surface, and at the center in the length direction of the long side outer surface. It has the feature that it is becoming larger.

本発明の作用、効果は次のとおりである。成形時に被成形材が立ち上がりながらパンチの外側面に摺接する経路は、長辺側経路と短辺側経路とで構成される。この２つの経路を被成形材の立ち上がり方向と直角に切断したときの断面積は、長辺側経路の方が短辺側経路に比べて大きいため、立ち上がる被成形材とパンチの外側面との間に生じる摺接抵抗は、長辺側経路の方が短辺側経路に比べて小さい。摺接抵抗が小さいほど、パンチから被成形材に付与された押圧力の圧力損失が小さくなるため、被成形材の立ち上がり速度が速くなる。   The operation and effect of the present invention are as follows. A path that is in sliding contact with the outer surface of the punch while the material to be molded rises during molding includes a long-side path and a short-side path. The cross-sectional area when the two paths are cut at right angles to the rising direction of the material to be molded is that the long side path is larger than the short side path. The sliding resistance generated between the long side path and the short side path is smaller than that of the short side path. The smaller the sliding contact resistance, the smaller the pressure loss of the pressing force applied from the punch to the material to be molded, so the rising speed of the material to be molded becomes faster.

したがって、従来の成形装置では、長辺側経路内で速く立ち上がろうとする被成形材の一部が、長辺側経路より立ち上がり速度の遅い短辺側経路内の被成形材に引っ張られ、その結果、長辺側経路内において被成形材の立ち上がり速度が不均一となる。この長辺側経路内における立ち上がり速度の不均一が、有底容器の長辺側壁部だけに割れや皺等の成形不良が生じる原因と考えられる。   Therefore, in the conventional molding apparatus, a part of the molding material which is going to rise quickly in the long side path is pulled by the molding material in the short side path whose rising speed is slower than the long side path, and as a result. In the long side path, the rising speed of the molding material becomes non-uniform. This non-uniform rising speed in the long side path is considered to be a cause of forming defects such as cracks and wrinkles only in the long side wall portion of the bottomed container.

そこで、本発明では、長辺側経路を構成する長辺側摺接面の高さを、短辺側経路に近い両端部で低くするとともに、短辺側経路から遠い中央部で高くし、この高低差により、被成形材が長辺側経路を立ち上がるときの摺接抵抗が、中央部で大きく、両端部が小さくなるようにした。この設定は、短辺側経路内の被成形材の影響を無視して長辺側経路内に限ってみれば、被成形材の立ち上がり速度は、中央部で最も遅く、両端に向かうほど速くなることを意味する。   Therefore, in the present invention, the height of the long side sliding contact surface constituting the long side path is lowered at both ends near the short side path, and is increased at the center far from the short side path. Due to the difference in height, the sliding contact resistance when the material to be formed rises up the long-side path was made large at the center and small at both ends. If this setting ignores the influence of the molding material in the short side path and is limited to the long side path, the rising speed of the molding material is the slowest at the center and faster toward both ends. Means that.

したがって、短辺側経路内の被成形材による引張りの影響を考慮すると、成形時の長辺側経路の両端部における被成形材の立ち上がり速度は、短辺側経路の被成形材に引っ張られることにより、中央部における被成形材の立ち上がり速度とほぼ同程度の速度まで低下する。これにより、長辺側経路内における被成形材の立ち上がり速度が、全長に亘ってほぼ均一となるので、有底容器の長辺側壁部における割れや皺等の成形不良の発生が防止される。   Therefore, when considering the influence of the tension by the molding material in the short side path, the rising speed of the molding material at both ends of the long side path during molding is pulled by the molding material of the short side path. As a result, the speed is reduced to substantially the same speed as the rising speed of the material to be molded in the central portion. As a result, the rising speed of the material to be molded in the long side path is substantially uniform over the entire length, thereby preventing the occurrence of molding defects such as cracks and wrinkles in the long side wall portion of the bottomed container.

実施例１の成形装置においてパンチが被成形材を押圧した瞬間の状態をあらわす断面図Sectional drawing showing the state of the moment the punch pressed the molding material in the molding apparatus of Example 1 図１のＡ−Ａ線断面図AA line sectional view of FIG. 有底容器の成形が完了した状態をあらわす断面図Sectional view showing the state where the bottomed container has been molded 図３のＢ−Ｂ線断面図BB sectional view of FIG. 図１のＣ−Ｃ線断面図CC sectional view of FIG. 実施例２の成形装置においてパンチがキャビティ内に進入した状態をあらわす断面図Sectional drawing showing the state which the punch entered into the cavity in the molding apparatus of Example 2 図６のＤ−Ｄ線断面図DD sectional view of FIG. 実施例３の成形装置においてパンチがキャビティ内に進入した状態をあらわす断面図Sectional drawing showing the state which the punch entered into the cavity in the molding apparatus of Example 3 図８のＥ−Ｅ線断面図EE sectional view of FIG. パンチの底面図Bottom view of punch 実施例４のパンチの側面図Side view of the punch of Example 4

本発明の成形装置は、前記底部押圧面のうち長辺方向両端部を除いた領域に、前記長辺側摺接面には開放されるが前記短辺側摺接面には開放されない形態の凹部が形成されていてもよい。
この構成によれば、パンチがキャビティ内に進入すると、底部押圧面のうち凹部の形成されていない長辺方向両端部が被成形材を衝撃的に押圧するので、まず、長辺方向両端部に近い短辺側経路と、長辺側経路のうち短辺側経路に近い両端部において、被成形材が先行して立ち上がる。その後、長辺側経路のうち長辺方向両端部を除いた領域、つまり凹部と対応する領域において、被成形材が遅れて立ち上がる。このように立ち上がり開始に時間差を設けたことにより、被成形材の立ち上がり速度の不均一が緩和される。 In the molding apparatus of the present invention, the bottom pressing surface is open to the long side sliding contact surface but not to the short side sliding contact surface in a region excluding both ends in the long side direction. A recess may be formed.
According to this configuration, when the punch enters the cavity, both ends of the long side direction in which the concave portion is not formed on the bottom pressing surface press the material to be shocked. The material to be molded rises in advance at both ends of the short side path and the long side path near the short side path. Thereafter, the material to be molded rises with a delay in a region of the long side path excluding both ends in the long side direction, that is, a region corresponding to the recess. Thus, by providing a time difference at the start of rising, unevenness of the rising speed of the molding material is alleviated.

本発明の成形装置は、前記底部押圧面における長辺方向両端部に、前記短辺側摺接面に対して鈍角をなすテーパ面が形成されていてもよい。
この構成によれば、底部押圧面で押圧された被成形材の一部は、テーパ面に沿った底部経路から短辺側経路へ流れの向きを変える。本発明では、底部押圧面のうち短辺側摺接面に繋がるテーパ面と、短辺側摺接面は鈍角をなしているので、底部押圧面と短辺側摺接面とが直角をなす場合に比べると、被成形材の流れの向きの変化が小さい。したがって、摺接抵抗が低減されるので、短辺側経路内の被成形材から長辺側経路内の被成形材に及ぼされる引張りの影響が軽減される。これにより、長辺側経路内における被成形材の立ち上がり速度の不均一を、より効果的に軽減することができる。 In the molding apparatus of the present invention, tapered surfaces that form an obtuse angle with respect to the short side sliding contact surface may be formed at both ends in the long side direction of the bottom pressing surface.
According to this configuration, a part of the molding material pressed by the bottom pressing surface changes the flow direction from the bottom path along the tapered surface to the short side path. In the present invention, since the tapered surface connected to the short side sliding surface of the bottom pressing surface and the short side sliding surface form an obtuse angle, the bottom pressing surface and the short side sliding surface form a right angle. Compared to the case, the change in the flow direction of the molding material is small. Therefore, since the sliding resistance is reduced, the influence of tension exerted on the molding material in the long side path from the molding material in the short side path is reduced. Thereby, the nonuniformity of the rising speed of the molding material in the long side path can be more effectively reduced.

本発明の成形装置は、前記底部押圧面に、長辺方向に沿って延び、長辺方向両端部が前記短辺側摺接面に達する溝部が形成されていてもよい。
この構成によれば、底部押圧面で押圧された被成形材の一部は、底部押圧面に沿った底部経路から長辺方向に沿って短辺側経路へ流れる。本発明では、底部押圧面に長辺方向の溝部を形成したので、底部経路における流れと直角な断面積は、溝部を形成しない場合に比べて大きくなり、底部経路における被成形材の流動抵抗が低減されている。これにより、短辺側経路内の被成形材から長辺側経路内の被成形材への引張りの影響が軽減されるので、長辺側経路内における被成形材の立ち上がり速度の不均一を、より効果的に軽減することができる。 In the molding apparatus according to the present invention, a groove portion may be formed on the bottom pressing surface so as to extend along the long side direction so that both end portions in the long side direction reach the short side sliding surface.
According to this configuration, a part of the molding material pressed by the bottom pressing surface flows from the bottom path along the bottom pressing surface to the short side path along the long side direction. In the present invention, since the groove in the long side direction is formed on the bottom pressing surface, the cross-sectional area perpendicular to the flow in the bottom path is larger than in the case where no groove is formed, and the flow resistance of the molding material in the bottom path is increased. Has been reduced. Thereby, since the influence of the tension from the molding material in the short side path to the molding material in the long side path is reduced, the rise rate of the molding material in the long side path is uneven. It can be reduced more effectively.

＜実施例１＞
以下、本発明を具体化した実施例１を図１〜図５を参照して説明する。本実施例１の成形装置Ｍａは、金属製の被成形材３５を収容するための上面開放のキャビティ１１が形成されたダイス１０と、ダイス１０の上方からキャビティ１１内への進入を可能に設けたパンチ２０とを備えて構成されている。有底容器３０を成形する際には、図１，２に示すように、キャビティ１１内に被成形材３５を収容した状態で、パンチ２０を急速に下降させ、パンチ２０の底部押圧面２１によって被成形材３５を衝撃的に押圧する。すると、パンチ２０からの押圧力を受けた被成形材３５の一部が、キャビティ１１の内側面１２Ｌ，１２Ｓ，１２Ｒとパンチ２０の外側面２２Ｌ，２２Ｓ，２２Ｒとの隙間において、被成形材３５に対するパンチ２０の押圧方向（以下、押圧方向という）と反対方向（つまり、上方）へ立ち上がりながら塑性変形し、図３，４に示すように、有底容器３０が成形される。 <Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. The forming apparatus Ma according to the first embodiment is provided with a die 10 in which a cavity 11 having an open upper surface for accommodating a metal molding material 35 is formed, and an entrance into the cavity 11 from above the die 10. The punch 20 is provided. When forming the bottomed container 30, as shown in FIGS. 1 and 2, the punch 20 is rapidly lowered in a state where the molding material 35 is accommodated in the cavity 11, and the bottom pressing surface 21 of the punch 20 is used. The molding material 35 is shockedly pressed. Then, a part of the molding material 35 that receives the pressing force from the punch 20 is formed in the gap between the inner side surfaces 12L, 12S, 12R of the cavity 11 and the outer side surfaces 22L, 22S, 22R of the punch 20. As shown in FIGS. 3 and 4, the bottomed container 30 is molded while being plastically deformed while rising in the opposite direction (that is, upward) to the pressing direction of the punch 20 (hereinafter referred to as the pressing direction).

図３，４に示すように、有底容器３０は、幅方向（左右方向）に長い略長方形をなす底壁部３１、底壁部３１の外周縁のうち長辺から上方へ直角に立ち上がる前後一対の長辺側壁部３２Ｌと、底壁部３１の外周縁のうち短辺から立ち上がる左右一対の短辺側壁部３２Ｓとを備えて構成されている。有底容器３０は、前後対称であり且つ左右対称な形状である。有底容器３０は、ハイブリット車両、電気自動車、電子機器等の二次電池を収容するためのケースとして用いられる。   As shown in FIGS. 3 and 4, the bottomed container 30 is a bottom wall portion 31 that has a substantially rectangular shape in the width direction (left and right direction), and before and after rising at a right angle from the long side of the outer peripheral edge of the bottom wall portion 31. A pair of long side wall portions 32 </ b> L and a pair of left and right short side wall portions 32 </ b> S rising from the short side of the outer peripheral edge of the bottom wall portion 31 are provided. The bottomed container 30 is symmetrical in the front-rear direction and has a symmetrical shape. The bottomed container 30 is used as a case for housing a secondary battery such as a hybrid vehicle, an electric vehicle, or an electronic device.

上記のようにパンチ２０の衝撃的な押圧力で被成形材３５を立ち上げて底面形状が略長方形をなす有底容器３０を成形する場合、キャビティ１１の内側面とパンチ２０の外側面との隙間を立ち上がる被成形材３５によって長辺側壁部３２Ｌと短辺側壁部３２Ｓが成形されるのであるが、従来では、長短両側壁部３２Ｌ，３２Ｓのうち長辺側壁部３２Ｌだけに割れや皺等の成形不良が生じることがあった。そこで、本実施例では、長辺側壁部３２Ｌにおける成形不良の発生を防止するための手段が講じている。以下、成形装置Ｍａの詳細形態とともに、成形不良の防止手段を説明する。尚、以下の説明で、キャビティ１１に対するパンチ２０の進退方向と上下方向を同義で用い、幅方向と左右方向を同義で用い、奥行き方向と前後方向を同義で用いる。   When forming the bottomed container 30 whose bottom shape is substantially rectangular by raising the material to be molded 35 with the impact pressure of the punch 20 as described above, the inner surface of the cavity 11 and the outer surface of the punch 20 are formed. The long side wall part 32L and the short side wall part 32S are formed by the molding material 35 rising from the gap. Conventionally, only the long side wall part 32L of the long and short side wall parts 32L, 32S has cracks, wrinkles, etc. In some cases, molding defects occurred. Therefore, in this embodiment, means for preventing the occurrence of molding defects in the long side wall portion 32L is taken. Hereinafter, a detailed description of the molding apparatus Ma and a means for preventing molding defects will be described. In the following description, the forward / backward direction and the vertical direction of the punch 20 with respect to the cavity 11 are used synonymously, the width direction and the horizontal direction are used synonymously, and the depth direction and the front / back direction are used synonymously.

キャビティ１１は、ダイス１０の上面を凹ませた形態であり、パンチ２０の進入を可能にするために、上面が開放された形態となっている。キャビティ１１内には、有底容器３０の成形素材である被成形材３５が収容されるようになっている。キャビティ１１の平面形状（開口形状）は、幅方向（左右方向）に細長い略長方形をなす。   The cavity 11 has a shape in which the upper surface of the die 10 is recessed, and the upper surface is open to allow the punch 20 to enter. In the cavity 11, a molding material 35 that is a molding material of the bottomed container 30 is accommodated. The planar shape (opening shape) of the cavity 11 is a substantially rectangular shape elongated in the width direction (left-right direction).

図５に示すように、キャビティ１１の内側面１２Ｌ，１２Ｓ，１２Ｒは、前後一対の平面状の長辺側内側面１２Ｌと、長辺側内側面１２Ｌと直角をなす左右一対の平面状の短辺側内側面１２Ｓと、長辺側内側面１２Ｌと短辺側内側面１２Ｓとを滑らかに繋ぐ二対の弧状内側面１２Ｒとによって構成されている。これらの内側面１２Ｌ，１２Ｓ，１２Ｒは、押圧方向と平行である。これらの内側面１２Ｌ，１２Ｓ，１２Ｒは、被成形材３５が立ち上がるときに摺接して、被成形材３５の立ち上がりに抗する摺接抵抗を生じさせるようになっている。   As shown in FIG. 5, the inner side surfaces 12L, 12S, and 12R of the cavity 11 are a pair of left and right planar short inner surfaces 12L and a pair of left and right planar short sides that are perpendicular to the long side inner side surface 12L. The side-side inner surface 12S, and two pairs of arc-shaped inner surfaces 12R that smoothly connect the long-side inner surface 12L and the short-side inner surface 12S. These inner side surfaces 12L, 12S, and 12R are parallel to the pressing direction. These inner side surfaces 12L, 12S, and 12R come into sliding contact when the molding material 35 rises, and generate sliding resistance against the rise of the molding material 35.

図１，２に示すように、キャビティ１１の底面は、被成形材３５を載置するとともに、パンチ２０からの押圧力（衝撃）を受け止めるための受圧面１３となっている。この受圧面１３は、パンチ２０の進退方向（押圧方向）と直角をなす水平な平坦面である。図１〜４に示すように、受圧面１３と内側面１２Ｌ，１２Ｓ，１２Ｒとは、球面状内面１４によって滑らかに繋がっている。   As shown in FIGS. 1 and 2, the bottom surface of the cavity 11 serves as a pressure receiving surface 13 for placing the molding material 35 and receiving a pressing force (impact) from the punch 20. The pressure receiving surface 13 is a horizontal flat surface perpendicular to the advance / retreat direction (pressing direction) of the punch 20. As shown in FIGS. 1 to 4, the pressure receiving surface 13 and the inner side surfaces 12 </ b> L, 12 </ b> S, 12 </ b> R are smoothly connected by a spherical inner surface 14.

パンチ２０は、全体としてブロック状をなす。パンチ２０のうち有底容器３０の成形に寄与する底部側（下端部側）の部分は、前後寸法に比べて左右寸法が大きい略直方形をなしている。パンチ２０の底面は、押圧方向と直角をなす水平な平面状の底部押圧面２１となっている。図５に示すように、パンチ２０の外側面２２Ｌ，２２Ｓ，２２Ｒは、前後一対の長辺側外側面２２Ｌと、左右一対の短辺側外側面２２Ｓと、長辺側外側面２２Ｌと短辺側外側面２２Ｓとを滑らかに繋ぐ弧状外側面２２Ｒとから構成される。また、図１〜４に示すように、外側面２２Ｌ，２２Ｓ，２２Ｒと底部押圧面２１は、球面状外面２３によって滑らかに繋がっている。   The punch 20 has a block shape as a whole. A portion of the punch 20 on the bottom side (lower end portion side) that contributes to the molding of the bottomed container 30 has a substantially rectangular shape whose left-right dimension is larger than the front-rear dimension. The bottom surface of the punch 20 is a horizontal flat bottom pressing surface 21 that is perpendicular to the pressing direction. As shown in FIG. 5, the outer surfaces 22L, 22S, 22R of the punch 20 include a pair of front and rear long side outer surfaces 22L, a pair of left and right short side outer surfaces 22S, a long side outer surface 22L, and a short side. An arcuate outer surface 22R that smoothly connects the side outer surface 22S. As shown in FIGS. 1 to 4, the outer side surfaces 22 </ b> L, 22 </ b> S, 22 </ b> R and the bottom pressing surface 21 are smoothly connected by a spherical outer surface 23.

図２，４，５に示すように、パンチ２０の前後方向（短辺方向）の奥行き寸法は、キャビティ１１の前後方向の寸法（長辺側内側面１２Ｌ間の間隔）よりも小さい寸法であり、この寸法差は、長辺側壁部３２Ｌの厚さ寸法に相当する。図１，３，５に示すように、パンチ２０の左右方向（長辺方向）の幅寸法は、キャビティ１１の左右方向の寸法（短辺側内側面１２Ｓ間の間隔）よりも小さい寸法であり、この寸法差は、短辺側壁部３２Ｓの厚さ寸法に相当する。また、図３，４に示すように、パンチ２０がその進退ストロークにおける最下端に位置した状態では、パンチ２０の底部押圧面２１がキャビティ１１の受圧面１３よりも高い位置にあり、この高低差は、底壁部３１の厚さ寸法に相当する。   As shown in FIGS. 2, 4, and 5, the depth dimension of the punch 20 in the front-rear direction (short side direction) is smaller than the dimension of the cavity 11 in the front-rear direction (interval between the long side inner surfaces 12L). This dimensional difference corresponds to the thickness dimension of the long side wall portion 32L. As shown in FIGS. 1, 3 and 5, the width dimension of the punch 20 in the left-right direction (long side direction) is smaller than the dimension in the left-right direction of the cavity 11 (interval between the short side inner surfaces 12 </ b> S). The dimensional difference corresponds to the thickness dimension of the short side wall portion 32S. 3 and 4, in the state where the punch 20 is positioned at the lowermost end in the forward / backward stroke, the bottom pressing surface 21 of the punch 20 is located higher than the pressure receiving surface 13 of the cavity 11, and this height difference Corresponds to the thickness dimension of the bottom wall portion 31.

図１〜４に示すように、パンチ２０の長辺側外側面２２Ｌのうち底部押圧面２１に繋がる下端部領域（つまり、押圧方向における前方側の領域）は、それよりも上方の領域に比べて前後方向へ段差状に張り出した長辺側ランド部２４Ｌとなっている。左右方向における長辺側ランド部２４Ｌの形成範囲は、長辺側外側面２２Ｌの左右方向全長に亘っている。また、長辺側ランド部２４Ｌの下端縁は、弧状外側面２２Ｒを介して底部押圧面２１に滑らかに繋がっている。この長辺側ランド部２４Ｌの外面は、押圧方向と平行な平面からなる長辺側摺接面２５Ｌとなっている。   As shown in FIGS. 1-4, the lower end part area | region (namely, area | region of the front side in a press direction) connected with the bottom part press surface 21 among 22 L of long side outer sides of the punch 20 is compared with the area | region above it. Thus, the long-side land portion 24L is projected in a step shape in the front-rear direction. The long-side land portion 24L is formed in the left-right direction over the entire length in the left-right direction of the long-side outer surface 22L. The lower end edge of the long side land portion 24L is smoothly connected to the bottom pressing surface 21 via the arc-shaped outer surface 22R. The outer surface of the long side land portion 24L is a long side sliding contact surface 25L that is a plane parallel to the pressing direction.

また、長辺側外側面２２Ｌのうち長辺側摺接面２５Ｌよりも上方の領域は、長辺側非摺接面２６Ｌとなっている。図２，４に示すように、長辺側摺接面２５Ｌの形成領域におけるパンチ２０の前後寸法は、パンチ２０の長辺側非摺接面２６Ｌの形成領域における前後寸法に比べて大きい。パンチ２０の押圧によって被成形材３５が立ち上がるとき、長辺側摺接面２５Ｌは、被成形材３５を摺接させることによって、立ち上がりに抗する摺接抵抗を生じさせるが、長辺側非摺接面２６Ｌに被成形材３５は接触しない。   Further, the region above the long side sliding surface 25L of the long side outer surface 22L is a long side non-sliding surface 26L. As shown in FIGS. 2 and 4, the front-rear dimension of the punch 20 in the formation region of the long-side slidable contact surface 25L is larger than the front-rear dimension in the formation region of the long-side non-slidable contact surface 26L. When the molding material 35 rises due to the pressing of the punch 20, the long side sliding contact surface 25 </ b> L causes sliding contact resistance against the rising by bringing the molding material 35 into sliding contact. The molding material 35 does not contact the contact surface 26L.

長辺側壁部３２Ｌにおける成形不良の発生を防止するため、底部押圧面２１を基準とする長辺側摺接面２５Ｌの高さは、図１に示すように、左右方向における長辺側外側面２２Ｌの両端部（つまり、長辺側外側面２２Ｌの長さ方向の両端部）で最小高さ寸法Ｈｂとなり、左右方向における長辺側外側面２２Ｌの中央に向かって大きくなるように設定されている。そして、底部押圧面２１を基準とする長辺側摺接面２５Ｌの高さは、左右方向中央において最大高さ寸法Ｈａとなる。長辺側摺接面２５Ｌの上縁（長辺側非摺接面２６Ｌとの境界）は、全体として上方へ膨らむように湾曲した形状である。また、長辺側摺接面２５Ｌの上縁における両端部は、ほぼ水平（押圧方向と略直角）をなしている。長辺側摺接面２５Ｌは、前後対称であり、且つ左右対称な形態である。   In order to prevent the occurrence of molding defects in the long side wall portion 32L, the height of the long side sliding contact surface 25L with respect to the bottom pressing surface 21 is as shown in FIG. The minimum height dimension Hb is set at both end portions of 22L (that is, both end portions in the length direction of the long side outer surface 22L) and is set to increase toward the center of the long side outer surface 22L in the left-right direction. Yes. The height of the long side sliding contact surface 25L with respect to the bottom pressing surface 21 is the maximum height dimension Ha at the center in the left-right direction. The upper edge of the long side sliding surface 25L (boundary with the long side non-sliding surface 26L) has a curved shape so as to swell upward as a whole. Further, both end portions of the upper edge of the long side sliding contact surface 25L are substantially horizontal (substantially perpendicular to the pressing direction). The long side slidable contact surface 25L is symmetric in the front-rear direction and is symmetric in the left-right direction.

底部押圧面２１を基準とする長辺側摺接面２５Ｌの最大高さ寸法Ｈａは、押圧方向におけるキャビティ１１の深さ寸法Ｄよりも小さく設定されている。したがって、図３，４に示すように、パンチ２０がキャビティ１１内に最も深く進入して有底容器３０の成形が完了した状態では、長辺側摺接面２５Ｌのうち最も高い幅方向中央部は、キャビティ１１の上端（ダイス１０の上面）よりも低い位置（つまり、キャビティ１１の内部）にある。   The maximum height dimension Ha of the long side sliding contact surface 25L with respect to the bottom pressing surface 21 is set to be smaller than the depth dimension D of the cavity 11 in the pressing direction. Therefore, as shown in FIGS. 3 and 4, in the state where the punch 20 has entered the cavity 11 most deeply and the molding of the bottomed container 30 is completed, the highest widthwise central portion of the long side sliding surface 25L. Is lower than the upper end of the cavity 11 (the upper surface of the die 10) (that is, inside the cavity 11).

パンチ２０の短辺側外側面２２Ｓのうち底部押圧面２１に繋がる下端部領域（つまり、押圧方向における前方側の領域）は、それよりも上方の領域に比べて前後方向へ段差状に張り出した短辺側ランド部２４Ｓとなっている。前後方向における短辺側ランド部２４Ｓの形成範囲は、短辺側外側面２２Ｓの前後方向全長に亘っている。また、短辺側ランド部２４Ｓの下端縁は、弧状外側面２２Ｒを介して底部押圧面２１に滑らかに繋がっている。この短辺側ランド部２４Ｓの外面は、押圧方向と平行な平面からなる短辺側摺接面２５Ｓとなっている。   The lower end region (that is, the region on the front side in the pressing direction) connected to the bottom pressing surface 21 of the short-side outer surface 22S of the punch 20 protrudes in a step shape in the front-rear direction compared to the region above it. The short side land portion 24S is formed. The formation range of the short-side land portion 24S in the front-rear direction extends over the entire length of the short-side outer surface 22S in the front-rear direction. Further, the lower end edge of the short side land portion 24S is smoothly connected to the bottom pressing surface 21 via the arc-shaped outer surface 22R. The outer surface of the short side land portion 24S is a short side sliding contact surface 25S made of a plane parallel to the pressing direction.

また、短辺側外側面２２Ｓのうち短辺側摺接面２５Ｓよりも上方の領域は、短辺側非摺接面２６Ｓとなっている。図１，３に示すように、パンチ２０の短辺側摺接面２５Ｓの形成領域における左右寸法は、パンチ２０の短辺側非摺接面２６Ｓの形成領域における左右寸法に比べて大きい。パンチ２０の押圧によって被成形材３５が立ち上がるとき、短辺側摺接面２５Ｓは、被成形材３５を摺接させることによって、立ち上がりに抗する摺接抵抗を生じさせるが、短辺側非摺接面２６Ｓに被成形材３５は接触しない。   Moreover, the area | region above the short side slidable contact surface 25S among the short side outer surface 22S becomes the short side non-slidable surface 26S. As shown in FIGS. 1 and 3, the left-right dimension in the formation region of the short-side slidable contact surface 25S of the punch 20 is larger than the left-right dimension in the formation region of the short-side non-slidable contact surface 26S of the punch 20. When the material to be molded 35 rises due to the pressing of the punch 20, the short side sliding surface 25 </ b> S causes a sliding resistance against the rising by bringing the material 35 into sliding contact. The molding material 35 does not contact the contact surface 26S.

底部押圧面２１を基準とする短辺側摺接面２５Ｓの高さ寸法Ｈｂは、前後方向において全長に亘って一定である。そして、長辺側壁部３２Ｌにおける成形不良の発生を防止するため、短辺側摺接面２５Ｓの高さ寸法Ｈｂは、長辺側摺接面２５Ｌの最小高さ寸法Ｈｂと同じ高さとされている。短辺側摺接面２５Ｓは、前後対称であり、且つ左右対称な形態である。   The height Hb of the short side sliding contact surface 25S with respect to the bottom pressing surface 21 is constant over the entire length in the front-rear direction. And in order to prevent the generation | occurrence | production of the shaping | molding defect in the long side side wall part 32L, the height dimension Hb of the short side sliding surface 25S is made the same height as the minimum height dimension Hb of the long side sliding surface 25L. Yes. The short side slidable contact surface 25S is symmetric in the front-rear direction and in a bilaterally symmetric form.

パンチ２０がキャビティ１１内に進入する押圧過程において、パンチ２０が被成形材３５への押圧を開始してから、有底容器３０の成形が完了するまでの間、キャビティ１１の内側面１２Ｌ，１２Ｓ，１２Ｒとパンチ２０の外側面２２Ｌ，２２Ｓ，２２Ｒとの間には、押圧された被成形材３５が立ち上がるときに、その被成形材３５を所定の厚さに成形しつつ案内する立ち上がり経路が形成される。立ち上がり経路は、左右方向（長辺方向）及び上下方向に関して長辺側摺接面２５Ｌと対応する長辺側経路２７Ｌと、前後方向（短辺方向）及び上下方向に関して短辺側摺接面２５Ｓと対応する短辺側経路２７Ｓとを備えて構成される。   In the pressing process in which the punch 20 enters the cavity 11, the inner surfaces 12 </ b> L and 12 </ b> S of the cavity 11 until the molding of the bottomed container 30 is completed after the punch 20 starts pressing the molding material 35. , 12R and the outer surface 22L, 22S, 22R of the punch 20, when the pressed molding material 35 rises, there is a rising path that guides the molding material 35 while forming the molding material 35 to a predetermined thickness. It is formed. The rising path includes a long side path 27L corresponding to the long side sliding surface 25L in the left-right direction (long side direction) and the vertical direction, and a short side sliding surface 25S in the front and back direction (short side direction) and the vertical direction. And corresponding short side paths 27S.

本実施例の有底容器３０は、長辺側壁部３２Ｌと短辺側壁部３２Ｓの厚さ寸法が０．７ｍｍであり、底壁部３１の厚さ寸法が１．１〜１．２ｍｍである。また、有底容器３０の側壁部３２Ｌ，３２Ｓの厚さ寸法と長辺に沿った幅寸法との比率は、約１：２００である。有底容器３０の長辺に沿った幅寸法と短辺に沿った奥行き寸法との比率は、約６：１である。また、パンチ２０の長辺側摺接面２５Ｌの最大高さ寸法Ｈａと最小高さ寸法Ｈｂとの比率は、約１２：１である。長辺側摺接面２５Ｌの最大高さ寸法Ｈａと、パンチ２０の長辺に沿った幅寸法との比率は、約１：１２である。尚、各図面における寸法比率は、便宜上デフォルメしている部分があり、これらの部分は上記各比率と整合していない。   In the bottomed container 30 of the present embodiment, the thickness dimension of the long side wall part 32L and the short side wall part 32S is 0.7 mm, and the thickness dimension of the bottom wall part 31 is 1.1 to 1.2 mm. . The ratio between the thickness dimension of the side wall portions 32L and 32S of the bottomed container 30 and the width dimension along the long side is about 1: 200. The ratio of the width dimension along the long side and the depth dimension along the short side of the bottomed container 30 is about 6: 1. The ratio of the maximum height dimension Ha to the minimum height dimension Hb of the long side sliding contact surface 25L of the punch 20 is about 12: 1. The ratio of the maximum height dimension Ha of the long side sliding contact surface 25L and the width dimension along the long side of the punch 20 is about 1:12. In addition, the dimension ratio in each drawing has the part deformed for convenience, and these parts are not consistent with each said ratio.

次に、被成形材３５が、パンチ２０の押圧力によって塑性変形しながら移動する形態について説明する。パンチ２０を下降させると、パンチ２０の底部押圧面２１とキャビティ１１の受圧面１３との間に底部経路２８が形成される。底部経路２８の高さ寸法は、パンチ２０の下降に伴って小さくなる。したがって、底部経路２８内では、パンチ２０からの押圧力を受けた被成形材３５が、底部押圧面２１と受圧面１３との間で潰されるように塑性変形しながら、中央から外周縁に向かって水平に移動する。そして、底部経路２８の外周縁で移動方向を水平方向から上方へ変えた被成形材３５は、長辺側経路２７Ｌと短辺側経路２７Ｓとに進入する。   Next, the form in which the molding material 35 moves while being plastically deformed by the pressing force of the punch 20 will be described. When the punch 20 is lowered, a bottom path 28 is formed between the bottom pressing surface 21 of the punch 20 and the pressure receiving surface 13 of the cavity 11. The height dimension of the bottom path 28 decreases as the punch 20 descends. Therefore, in the bottom path 28, the material 35 to which the pressing force is applied from the punch 20 is plastically deformed so as to be crushed between the bottom pressing surface 21 and the pressure receiving surface 13, and from the center toward the outer peripheral edge. Move horizontally. Then, the molding material 35 whose movement direction is changed from the horizontal direction to the upper side at the outer peripheral edge of the bottom path 28 enters the long side path 27L and the short side path 27S.

長辺側経路２７Ｌ内においては、被成形材３５が、長辺側内側面１２Ｌと長辺側摺接面２５Ｌとに挟まれた状態で摺接しながら立ち上がることによって長辺側壁部３２Ｌを形成する。短辺側経路２７Ｓ内においては、被成形材３５が、短辺側内側面１２Ｓと短辺側摺接面２５Ｓとに挟まれた状態で摺接しながら立ち上がることによって短辺側壁部３２Ｓを形成する。   In the long side path 27L, the molding material 35 rises while sliding while being sandwiched between the long side inner side surface 12L and the long side side sliding contact surface 25L, thereby forming the long side wall portion 32L. . In the short side path 27S, the material 35 to be molded rises while sliding while being sandwiched between the short side inner surface 12S and the short side sliding surface 25S, thereby forming the short side wall portion 32S. .

被成形材３５のうち長辺側経路２７Ｌ（長辺側摺接面２５Ｌ）を通過して長辺側非摺接面２６Ｌと対応する高さまで上昇した部分は、長辺側内側面１２Ｌには摺接するが、パンチ２０とは接触せず、長辺側非摺接面２６Ｌに対して間隔を空けた状態で立ち上がりを続ける。したがって、被成形材３５のうち長辺側経路２７Ｌよりも上方の領域には、大きな摺接抵抗は作用しない。   A portion of the molding material 35 that passes through the long side path 27L (the long side sliding contact surface 25L) and rises to a height corresponding to the long side non-sliding contact surface 26L is formed on the long side inner side surface 12L. Although it is in sliding contact, it does not come into contact with the punch 20 and continues to stand up while being spaced from the long side non-sliding contact surface 26L. Therefore, a large slidable contact resistance does not act on the region above the long side path 27L of the material to be molded 35.

また、被成形材３５のうち短辺側経路２７Ｓ（短辺側摺接面２５Ｓ）を通過して短辺側非摺接面２６Ｓと対応する高さへ上昇した部分は、短辺側内側面１２Ｓには摺接するが、パンチ２０とは接触せず、短辺側非摺接面２６Ｓに対して間隔を空けた状態で立ち上がりを続ける。したがって、被成形材３５のうち短辺側経路２７Ｓよりも上方の領域には、大きな摺接抵抗は作用しない。   Further, the portion of the molding material 35 that passes through the short-side path 27S (short-side sliding surface 25S) and rises to a height corresponding to the short-side non-sliding surface 26S is the short-side inner surface. Although it is in sliding contact with 12S, it does not come into contact with the punch 20 and continues to rise in a state of being spaced from the short side non-sliding contact surface 26S. Therefore, a large sliding contact resistance does not act on the region above the short side path 27 </ b> S of the material to be molded 35.

次に、長辺側壁部３２Ｌにおける成形不良の発生防止について説明する。成形時の被成形材３５は、長辺側経路２７Ｌ内と短辺側経路２７Ｓ内を立ち上がりながらパンチ２０の長辺側摺接面２５Ｌと短辺側摺接面２５Ｓとに摺接する。図５に示すように、この２つの立ち上がり経路２７Ｌ，２７Ｓを被成形材３５の立ち上がり方向と直角に切断したときの断面積は、長辺側経路２７Ｌの方が短辺側経路２７Ｓに比べて大きい。そのため、立ち上がる被成形材３５とパンチ２０との間に生じる摺接抵抗は、長辺側経路２７Ｌ（長辺側摺接面２５Ｌ）の方が短辺側経路２７Ｓ（短辺側摺接面２５Ｓ）に比べて小さい。摺接抵抗が小さいほど、パンチ２０から被成形材３５に付与された押圧力の圧力損失が小さくなるため、被成形材３５の立ち上がり速度が速くなる。   Next, generation prevention of molding defects in the long side wall portion 32L will be described. The molding material 35 at the time of molding slides on the long side sliding surface 25L and the short side sliding surface 25S of the punch 20 while rising in the long side path 27L and the short side path 27S. As shown in FIG. 5, when the two rising paths 27L and 27S are cut at right angles to the rising direction of the molding material 35, the long side path 27L has a longer cross section than the short side path 27S. large. Therefore, the sliding contact resistance generated between the workpiece 35 that rises and the punch 20 has a long side path 27L (long side sliding surface 25L) and a short side path 27S (short side sliding surface 25S). Is smaller than As the slidable contact resistance is smaller, the pressure loss of the pressing force applied from the punch 20 to the molding material 35 becomes smaller, so that the rising speed of the molding material 35 becomes faster.

したがって、従来の成形装置では、長辺側経路２７Ｌ内で速く立ち上がろうとする被成形材３５の一部（両端側部分）が、長辺側経路２７Ｌよりも立ち上がり速度の遅い短辺側経路２７Ｓ内の被成形材３５に引っ張られ、その結果、長辺側経路２７Ｌ内における被成形材３５の立ち上がり速度が、左右方向（立ち上がり方向と直角な方向）において不均一となり、左右方向中央部で速く、左右方向両端部で遅くなる。この長辺側経路２７Ｌ内における立ち上がり速度の不均一が、有底容器３０の長辺側壁部３２Ｌだけに割れや皺等の成形不良が生じる原因と考えられる。   Therefore, in the conventional molding apparatus, a part (both end portions) of the molding material 35 that is about to rise quickly in the long side path 27L is in the short side path 27S where the rising speed is slower than that of the long side path 27L. As a result, the rising speed of the molding material 35 in the long side path 27L becomes uneven in the left-right direction (direction perpendicular to the rising direction), and is fast at the center in the left-right direction. Slower at both ends in the left-right direction. This non-uniform rising speed in the long side path 27L is considered to be the cause of forming defects such as cracks and wrinkles only in the long side wall portion 32L of the bottomed container 30.

そこで、本実施例１では、底部押圧面２１を基準とする長辺側摺接面２５Ｌの高さ寸法を、左右方向（長辺側外側面２２Ｌの長さ方向）における両端部（つまり、短辺側経路２７Ｓの近い領域）で最小とし、左右方向における中央に向かって（つまり、短辺側経路２７Ｓから遠ざかるほど）大きくなるように設定した。この高低差により、被成形材３５が長辺側経路２７Ｌを立ち上がるときの摺接抵抗は、短辺側経路２７Ｓから遠い中央部で大きく、短辺側に近い両端部で小さくなる。この設定は、短辺側経路２７Ｓ内の被成形材３５の影響を無視して長辺側経路２７Ｌ内に限ってみれば、被成形材３５の立ち上がり速度は、中央部で最も遅く、両端に向かうほど速くなることを意味する。   Therefore, in the first embodiment, the height dimension of the long side sliding contact surface 25L with respect to the bottom pressing surface 21 is set to both end portions (that is, the short side in the length direction of the long side outer surface 22L). It is set to be the smallest in the area close to the side path 27S and to increase toward the center in the left-right direction (that is, the distance from the short side path 27S). Due to this height difference, the sliding resistance when the molding material 35 rises up the long side path 27L is large at the central portion far from the short side path 27S, and small at both end portions near the short side. In this setting, if the influence of the molding material 35 in the short side path 27S is ignored and limited within the long side path 27L, the rising speed of the molding material 35 is the slowest at the center and at both ends. It means faster as you go.

したがって、短辺側経路２７Ｓ内の被成形材３５による引張りの影響を考慮すると、成形時の長辺側経路２７Ｌの左右方向両端部における被成形材３５の立ち上がり速度は、短辺側経路２７Ｓの被成形材３５に引っ張られることにより、左右方向中央部における被成形材３５の立ち上がり速度とほぼ同程度の速度まで低下する。これにより、長辺側経路２７Ｌ内における被成形材３５の立ち上がり速度が、全長に亘ってほぼ均一となるので、有底容器３０の長辺側壁部３２Ｌにおける割れや皺等の成形不良の発生が防止される。   Therefore, in consideration of the influence of the tension by the molding material 35 in the short side path 27S, the rising speed of the molding material 35 at both ends in the left and right direction of the long side path 27L during molding is the same as that of the short side path 27S. By being pulled by the material to be molded 35, the speed is lowered to a speed that is approximately the same as the rising speed of the material to be molded 35 in the central portion in the left-right direction. Thereby, since the rising speed of the molding material 35 in the long side path 27L becomes substantially uniform over the entire length, occurrence of molding defects such as cracks and wrinkles in the long side wall portion 32L of the bottomed container 30 occurs. Is prevented.

＜実施例２＞
次に、本発明を具体化した実施例２を図６〜図７を参照して説明する。本実施例２の成形装置Ｍｂは、パンチ４０の底部形状を上記実施例１とは異なる構成としたものである。その他の構成については上記実施例１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。 <Example 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the molding apparatus Mb of the second embodiment, the bottom shape of the punch 40 is different from that of the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and descriptions of the structure, operation, and effects are omitted.

パンチ４０の底部押圧面４１には、その長辺方向両端部を除いた領域を凹ませた形態の凹部４２が形成されている。凹部４２は、長辺側摺接面２５Ｌ（長辺側経路２７Ｌ）には開放されるが、短辺側摺接面２５Ｓ（短辺側経路２７Ｓ）には開放されない形態となっている。底部押圧面４１は、長辺方向両端部に位置する左右対称な一対の第１押圧面４３と、凹部４２における長辺方向両端部に位置する左右対称に一対の第２押圧面４４と、凹部４２のうち一対の第２押圧面４４の間に位置する１つの第３押圧面４５とによって構成されている。   On the bottom pressing surface 41 of the punch 40, a recess 42 is formed in which a region excluding both ends in the long side direction is recessed. The recess 42 is open to the long side sliding contact surface 25L (long side path 27L), but not open to the short side sliding contact surface 25S (short side path 27S). The bottom pressing surface 41 includes a pair of symmetrical first pressing surfaces 43 positioned at both ends in the long side direction, a pair of second pressing surfaces 44 symmetrically positioned at both ends in the long side direction of the recess 42, and a recess. 42, one third pressing surface 45 located between the pair of second pressing surfaces 44.

第１押圧面４３と第３押圧面４５は、パンチ４０の押圧方向と直角な平面からなる。第２押圧面４４は、第１押圧面４３及び第３押圧面４５に対して斜めをなしている。長辺方向における第１押圧面４３と第２押圧面４４の長さ寸法の比率は、約１：１である。長辺方向における第１押圧面４３と第３押圧面４５の長さ寸法の比率は、約１：１４である。第１押圧面４３の長辺方向の長さ寸法と、第１押圧面４３と第３押圧面４５の高低差寸法との比率は、約４：１である。   The first pressing surface 43 and the third pressing surface 45 are flat surfaces perpendicular to the pressing direction of the punch 40. The second pressing surface 44 is inclined with respect to the first pressing surface 43 and the third pressing surface 45. The ratio of the length dimension of the first pressing surface 43 and the second pressing surface 44 in the long side direction is about 1: 1. The ratio of the length dimension of the first pressing surface 43 and the third pressing surface 45 in the long side direction is about 1:14. The ratio of the length dimension of the first pressing surface 43 in the long side direction to the height difference dimension of the first pressing surface 43 and the third pressing surface 45 is about 4: 1.

パンチ４０がキャビティ１１内に進入すると、底部押圧面４１のうち凹部４２の形成されていない長辺方向両端部（第１押圧面４３）が被成形材３５を衝撃的に押圧するので、まず、長辺方向両端部に近い短辺側経路２７Ｓと、長辺側経路２７Ｌのうち短辺側経路２７Ｓに近い両端部において、被成形材３５が先行して立ち上がる。その後、長辺側経路２７Ｌのうち、長辺方向における長辺方向両端部を除いた領域であって凹部４２の第２押圧面４４と対応する領域において、被成形材３５が遅れて立ち上がる。その後、長辺側経路２７Ｌのうち、長辺方向における第３押圧面４５と対応する領域において、被成形材３５が更に遅れて立ち上がる。   When the punch 40 enters the cavity 11, both the long side direction end portions (first pressing surfaces 43) in which the concave portions 42 are not formed in the bottom pressing surface 41 press the material 35 to be shocked. The material to be molded 35 rises in advance at the short side path 27S near both ends in the long side direction and at both ends of the long side path 27L near the short side path 27S. Thereafter, in the long side path 27L, in the region excluding both ends in the long side direction in the long side direction and corresponding to the second pressing surface 44 of the recess 42, the molding material 35 rises with a delay. Thereafter, in the region corresponding to the third pressing surface 45 in the long side direction in the long side path 27L, the molding material 35 rises with a further delay.

本実施例２では、長辺側経路２７Ｌにおける被成形材３５の立ち上がり開始のタイミングを、長辺方向両端部（つまり、被成形材３５の立ち上がり速度が比較的遅い短辺側経路２７Ｓに近い領域）で早くし、長辺方向中央部（長辺方向両端部に比べて被成形材３５の立ち上がり速度の速い領域）で遅くした。このように立ち上がり開始に時間差を設けたことにより、長辺側経路２７Ｌの長辺方向における被成形材３５の立ち上がり速度の不均一が緩和される。   In the second embodiment, the rising start timing of the molding material 35 in the long-side path 27L is set at both ends in the long-side direction (that is, the region close to the short-side path 27S where the rising speed of the molding material 35 is relatively slow ), And at the center in the long side direction (region where the rising speed of the molding material 35 is higher than at both ends in the long side direction). Thus, by providing a time difference at the start of rising, unevenness of the rising speed of the molding material 35 in the long side direction of the long side path 27L is alleviated.

＜実施例３＞
次に、本発明を具体化した実施例３を図８〜図１０を参照して説明する。本実施例３の成形装置Ｍｃは、パンチ５０の底部形状を上記実施例１とは異なる構成としたものである。その他の構成については上記実施例１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。 <Example 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. In the molding apparatus Mc of the third embodiment, the bottom shape of the punch 50 is different from that of the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and descriptions of the structure, operation, and effects are omitted.

パンチ５０の底部押圧面５１は、全体として船底形をなす。つまり、底部押圧面５１は、前後方向における中央において最も低く、長辺側摺接面２５Ｌに繋がる前縁と後縁において最も高くなっている。また、底部押圧面５１の左右方向（長辺方向）における両端部には、短辺側摺接面２５Ｓに対して鈍角をなすテーパ面５２が形成されている。   The bottom pressing surface 51 of the punch 50 has a ship bottom shape as a whole. That is, the bottom pressing surface 51 is lowest at the center in the front-rear direction and highest at the front edge and the rear edge connected to the long side sliding contact surface 25L. Moreover, the taper surface 52 which makes an obtuse angle with respect to the short side side sliding contact surface 25S is formed in the both ends in the left-right direction (long side direction) of the bottom part press surface 51. As shown in FIG.

底部押圧面５１で押圧された被成形材３５（図示省略）の一部は、テーパ面５２に沿った底部経路５３を略水平に移動した後、短辺側経路２７Ｓに向かって上方へ移動方向を変える。ここで、テーパ面５２と短辺側摺接面２５Ｓとは鈍角をなしているので、実施例１のように底部押圧面２１と短辺側摺接面２５Ｓとが直角をなす場合に比べると、被成形材３５の流れの向きの変化が小さい。したがって、短辺側経路２７Ｓ内における摺接抵抗が低減されるので、短辺側経路２７Ｓ内の被成形材３５から長辺側経路２７Ｌ内の被成形材３５に及ぼされる引張りの影響が軽減される。これにより、長辺側経路２７Ｌ内における被成形材３５の立ち上がり速度の不均一が、より効果的に軽減される。   A part of the molding material 35 (not shown) pressed by the bottom pressing surface 51 moves substantially horizontally along the bottom path 53 along the tapered surface 52, and then moves upward toward the short side path 27S. change. Here, since the taper surface 52 and the short side slidable contact surface 25S form an obtuse angle, as compared with the case where the bottom pressing surface 21 and the short side slidable contact surface 25S form a right angle as in the first embodiment. The change in the flow direction of the molding material 35 is small. Therefore, the sliding contact resistance in the short side path 27S is reduced, so that the influence of tension exerted on the molding material 35 in the long side path 27L from the molding material 35 in the short side path 27S is reduced. The Thereby, the nonuniformity of the rising speed of the molding material 35 in the long side path 27L is more effectively reduced.

＜実施例４＞
次に、本発明を具体化した実施例４を図１１を参照して説明する。本実施例４の成形装置Ｍｄは、パンチ６０の底部形状を上記実施例１とは異なる構成としたものである。その他の構成については上記実施例１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。 <Example 4>
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the molding apparatus Md according to the fourth embodiment, the bottom shape of the punch 60 is different from that of the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and descriptions of the structure, operation, and effects are omitted.

パンチ６０の底部押圧面６１には、左右方向（長辺方向）に沿って延び、左右方向における両端部が短辺側摺接面２５Ｓに達する溝部６２が形成されている。長辺方向（左右方向）において、溝部６２は、底部押圧面６１の全長に亘って連続した形態である。また、前後方向（短辺方向）において、溝部６２は、底部押圧面６１の中央位置に形成されている。   The bottom pressing surface 61 of the punch 60 is formed with a groove portion 62 extending in the left-right direction (long side direction) and having both end portions in the left-right direction reaching the short-side slidable contact surface 25S. In the long side direction (left-right direction), the groove part 62 is a form that continues over the entire length of the bottom pressing surface 61. The groove 62 is formed at the center position of the bottom pressing surface 61 in the front-rear direction (short-side direction).

底部押圧面６１で押圧された被成形材３５（図示省略）の一部は、底部押圧面６１に沿った底部経路（図示省略）から長辺方向に沿って短辺側経路２７Ｓへ流れる。ここで、底部押圧面６１には長辺方向に沿った溝部６２が形成されているので、底部経路における流れと直角な断面積は、溝部６２を形成しない場合に比べて大きくなり、底部経路における被成形材３５の流動抵抗が低減されている。これにより、短辺側経路２７Ｓ内の被成形材３５から長辺側経路２７Ｌ内の被成形材３５に及ぼされる引張りの影響が軽減されるので、長辺側経路２７Ｌ内における被成形材３５の立ち上がり速度の不均一を、より効果的に軽減することができる。   A part of the molding material 35 (not shown) pressed by the bottom pressing surface 61 flows from the bottom path (not shown) along the bottom pressing surface 61 to the short side path 27S along the long side direction. Here, since the groove 62 along the long side direction is formed on the bottom pressing surface 61, the cross-sectional area perpendicular to the flow in the bottom path is larger than in the case where the groove 62 is not formed. The flow resistance of the molding material 35 is reduced. Thereby, since the influence of the tension exerted on the molding material 35 in the long side path 27L from the molding material 35 in the short side path 27S is reduced, the molding material 35 in the long side path 27L is reduced. Unevenness of the rising speed can be reduced more effectively.

＜他の実施例＞
本発明は上記記述及び図面によって説明した実施例に限定されるものではなく、例えば次のような実施例も本発明の技術的範囲に含まれる。
（１）上記実施例１〜４では、長辺側摺接面の最小高さを、短辺側摺接面と同じ高さとしたが、長辺側摺接面の最小高さは、短辺側摺接面より高くてもよく、短辺側摺接面より低くてもよい。
（２）上記実施例１〜４では、短辺側摺接面の高さを一定としたが、短辺側摺接面の高さは、短辺方向中央から両端に向かって低くなるようにしてもよく、短辺方向中央から両端に向かって高くなるようにしてもよい。
（３）上記実施例１〜４では、長辺側摺接面の上端縁を滑らかに連続する曲線を含む形状としたが、長辺側摺接面の上端縁は、直線だけで構成される形状としてもよい。
（４）上記実施例２，３に実施例４の溝部を付加してもよい。
（５）上記実施例２，４に実施例３のテーパ面を付加してもよい。
（６）上記実施例１〜４において設定又は適用した寸法比率は一例を示すものであり、本発明は、上記実施例に記載した以外の寸法比率のものに設定できるとともに適用できる。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above Examples 1 to 4, the minimum height of the long side sliding surface is the same as the short side sliding surface, but the minimum height of the long side sliding surface is the short side. It may be higher than the side sliding surface and may be lower than the short side sliding surface.
(2) In Examples 1 to 4, the height of the short side sliding surface is constant, but the height of the short side sliding surface is decreased from the center in the short side direction toward both ends. Alternatively, the height may increase from the center in the short side direction toward both ends.
(3) In the first to fourth embodiments, the upper edge of the long side sliding surface has a shape including a smoothly continuous curve. However, the upper edge of the long side sliding surface is composed of only a straight line. It is good also as a shape.
(4) The groove portion of the fourth embodiment may be added to the second and third embodiments.
(5) The tapered surface of the third embodiment may be added to the second and fourth embodiments.
(6) The dimensional ratios set or applied in the above Examples 1 to 4 show an example, and the present invention can be set and applied to dimensions other than those described in the above Examples.

Ｍａ…成形装置
１０…ダイス
１１…キャビティ
２０…パンチ
２１…底部押圧面
２２Ｌ…長辺側外側面
２２Ｓ…短辺側外側面
２５Ｌ…長辺側摺接面
２５Ｓ…短辺側摺接面
２７Ｌ…長辺側経路
２７Ｓ…短辺側経路
３０…有底容器
３５…被成形材
Ｍｂ，Ｍｃ，Ｍｄ…成形装置
４０，５０，６０…パンチ
４１，５１，６１…底部押圧面
４２…凹部
５２…テーパ面
６２…溝部 Ma ... Molding device 10 ... Die 11 ... Cavity 20 ... Punch 21 ... Bottom pressing surface 22L ... Long side outer surface 22S ... Short side outer surface 25L ... Long side sliding surface 25S ... Short side sliding surface 27L ... Long side path 27S ... Short side path 30 ... Bottomed container 35 ... Molded material Mb, Mc, Md ... Molding device 40, 50, 60 ... Punch 41, 51, 61 ... Bottom pressing surface 42 ... Concave portion 52 ... Taper Surface 62 ... groove

Claims (4)

被成形材を収容するための上面開放のキャビティが形成されたダイスと、
前記ダイスの上方から前記キャビティ内への進入を可能に設けたパンチとを備え、
前記パンチの底部押圧面によって衝撃的に押圧した前記被成形材を、前記キャビティと前記パンチとの隙間において押圧方向と反対方向へ立ち上げながら塑性変形させることにより、底面形状が略長方形をなす有底容器を成形する成形装置であって、
前記パンチの長辺側外側面には、前記キャビティの内側面との間に前記被成形材を立ち上げるための長辺側経路を構成するとともに、立ち上がる前記被成形材を摺接させる長辺側摺接面が形成され、
前記パンチの短辺側外側面には、前記キャビティの内側面との間に前記被成形材を立ち上げるための短辺側経路を構成するとともに、立ち上がる前記被成形材を摺接させる短辺側摺接面が形成され、
前記底部押圧面を基準とする前記長辺側摺接面の高さ寸法は、前記長辺側外側面の長さ方向両端部で最小であり、前記長辺側外側面の長さ方向中央に向かって大きくなっていることを特徴とする有底容器の成形装置。 A die formed with a cavity having an open top surface for accommodating a molding material;
A punch provided to allow entry into the cavity from above the die,
The bottom material has an approximately rectangular bottom shape by plastically deforming the material to be molded, which has been shockedly pressed by the bottom pressing surface of the punch, while rising in a direction opposite to the pressing direction in the gap between the cavity and the punch. A molding device for molding a bottom container,
The long side side outer surface of the punch forms a long side path for raising the molding material between the inner side surface of the cavity and the long side side where the rising molding material slides. A sliding surface is formed,
The short side of the short side of the punch forms a short side path for raising the molding material between the inner side of the cavity and the short side of the rising material to be slidably contacted A sliding surface is formed,
The height dimension of the long side slidable contact surface with respect to the bottom pressing surface is minimum at both ends in the length direction of the long side outer surface, and at the center in the length direction of the long side outer surface. An apparatus for forming a bottomed container, characterized in that the container becomes larger toward the bottom. 前記底部押圧面のうち長辺方向両端部を除いた領域に、前記長辺側摺接面には開放されるが前記短辺側摺接面には開放されない形態の凹部が形成されていることを特徴とする請求項１記載の有底容器の成形装置。   A recess is formed in the bottom pressing surface excluding both ends in the long side direction so as to be opened on the long side sliding contact surface but not on the short side sliding contact surface. The apparatus for forming a bottomed container according to claim 1. 前記底部押圧面における長辺方向両端部には、前記短辺側摺接面に対して鈍角をなすテーパ面が形成されていることを特徴とする請求項１または請求項２記載の有底容器の成形装置。   3. The bottomed container according to claim 1, wherein a tapered surface having an obtuse angle with respect to the short side sliding contact surface is formed at both ends in the long side direction of the bottom pressing surface. Molding equipment. 前記底部押圧面には、長辺方向に沿って延び、長辺方向両端部が前記短辺側摺接面に達する溝部が形成されていることを特徴とする請求項１ないし請求項３のいずれか１項に記載の有底容器の成形装置。   4. The groove according to claim 1, wherein the bottom pressing surface is formed with a groove extending along the long side direction and having both end portions in the long side direction reaching the short side sliding surface. The apparatus for forming a bottomed container according to claim 1.
JP2012108008A 2012-05-09 2012-05-09 Device for molding bottomed container Pending JP2013233574A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2015174131A (en) * 2014-03-17 2015-10-05 フタバ産業株式会社 Punch die

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JPH06285580A (en) * 1993-04-05 1994-10-11 Toyota Tsusho Kk Manufacture of metallic square extreme thin and tall case and metallic mold used therefor
JPH105907A (en) * 1996-06-21 1998-01-13 Masayuki Okano Manufacture of bottomed container and its die
JPH1024343A (en) * 1996-07-09 1998-01-27 Mitsubishi Alum Co Ltd Manufacture of container with bottom
JP2002178096A (en) * 2000-12-13 2002-06-25 Mitsui Mining & Smelting Co Ltd Manufacturing method of metal square can by backward extrusion forming
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Publication number Priority date Publication date Assignee Title
JPH06285580A (en) * 1993-04-05 1994-10-11 Toyota Tsusho Kk Manufacture of metallic square extreme thin and tall case and metallic mold used therefor
JPH105907A (en) * 1996-06-21 1998-01-13 Masayuki Okano Manufacture of bottomed container and its die
JPH1024343A (en) * 1996-07-09 1998-01-27 Mitsubishi Alum Co Ltd Manufacture of container with bottom
JP2002178096A (en) * 2000-12-13 2002-06-25 Mitsui Mining & Smelting Co Ltd Manufacturing method of metal square can by backward extrusion forming
US20020101140A1 (en) * 2001-02-01 2002-08-01 Juha Sormunen Method of manufacturing a cover for communication devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015174131A (en) * 2014-03-17 2015-10-05 フタバ産業株式会社 Punch die

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