JPH05344A - Method and apparatus for manufacturing top plate for metal drum container - Google Patents
Method and apparatus for manufacturing top plate for metal drum containerInfo
- Publication number
- JPH05344A JPH05344A JP3187735A JP18773591A JPH05344A JP H05344 A JPH05344 A JP H05344A JP 3187735 A JP3187735 A JP 3187735A JP 18773591 A JP18773591 A JP 18773591A JP H05344 A JPH05344 A JP H05344A
- Authority
- JP
- Japan
- Prior art keywords
- flange portion
- temporary
- temporary flange
- circular hole
- top plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
(57)【要約】
【目的】 金属ドラム容器の天板に円筒状のフランジ部
を備えた開口部を一体に成形する方法及びその装置を提
供することを目的とする。
【構成】 薄板の鋼板からなる天板素材１に開口部２の
径より小径の円孔２０を穿設する工程と、円孔２０の周
縁部を該円孔を含んで略円錐台形状に上方に隆起させて
第１の仮フランジ部２１を成形する工程と、第１仮フラ
ンジ部２１の基部の周縁部を略円錐台形状に上方に隆起
させて第２の仮フランジ部２２を含む第３の仮フランジ
部２３を成形する工程と、第３の仮フランジ部２３を垂
直に起立させてフランジ部３を成形する工程とからな
る。
(57) [Abstract] [Object] An object of the present invention is to provide a method and an apparatus for integrally forming an opening portion having a cylindrical flange portion on a top plate of a metal drum container. [Structure] A step of forming a circular hole 20 having a diameter smaller than the diameter of an opening 2 in a top plate material 1 made of a thin steel plate, and a peripheral portion of the circular hole 20 is upwardly formed into a substantially truncated cone shape including the circular hole. And a step of forming the first temporary flange portion 21 by raising the peripheral edge portion of the base portion of the first temporary flange portion 21 upward in a substantially frustoconical shape and including a second temporary flange portion 22. And the step of forming the flange portion 3 by vertically erecting the third temporary flange portion 23.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属ドラム容器の天板
に、内容物の出し入れ等に使用する開口部を成形する金
属ドラム容器用天板の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a top plate for a metal drum container, in which a top plate of the metal drum container is formed with an opening used for putting in and taking out contents.
【０００２】[0002]
【従来の技術】一般に、この種の金属ドラム容器は、円
筒状の胴部と、該胴部の底部を閉塞する円盤状の底板
と、該胴部の上部を閉塞する円盤状の天板とで構成され
ている。そして、例えば、図９に示すように、天板50に
は、ドラム容器の内容物の出し入れ等に使用される開口
部51が形成されている。該開口部51には、上方に向かっ
て起立する円筒状のフランジ部52がその周縁に形成され
ている。2. Description of the Related Art Generally, a metal drum container of this type includes a cylindrical body, a disk-shaped bottom plate that closes the bottom of the body, and a disk-shaped top plate that closes the upper portion of the body. It is composed of. Then, for example, as shown in FIG. 9, the top plate 50 is formed with an opening 51 used for taking in and out the contents of the drum container. The opening 51 is provided with a cylindrical flange portion 52 standing upright on the periphery thereof.
【０００３】該フランジ部52の内壁側には円筒状の取付
け部材53が挿着され、更に、該取付け部材53の内壁面に
は雌ネジ54が形成されている。該取付け部材53は、開口
部51を閉蓋する図示しない口栓を螺着するために設けら
れ、該口栓の外周に形成された雄ネジを取付け部材53の
雌ネジ54に螺着して、その開口部51が閉塞される。A cylindrical mounting member 53 is inserted on the inner wall side of the flange portion 52, and a female screw 54 is formed on the inner wall surface of the mounting member 53. The mounting member 53 is provided for screwing a cap (not shown) that closes the opening 51, and a male screw formed on the outer periphery of the cap is screwed to the female screw 54 of the mounting member 53. The opening 51 is closed.
【０００４】しかし、このように前記取付け部材53がフ
ランジ部52の内壁側に挿着されているドラム容器におい
ては、フランジ部52と取付け部材53とが確実に固定され
ていることが必要となる。即ち、フランジ部52と取付け
部材53との固定が不完全である場合には、それらの隙間
から内容物が漏出するおそれがある。また、前記開口部
51を閉塞した前記口栓を取り除く際に、取付け部材53と
口栓とが共に回転してしまい、口栓が取付け部材53から
取り除けなくなるおそれがある。このため、フランジ部
52に取付け部材53を挿着する際には、フランジ部52に取
付け部材53を確実に固定してしかも完全に密着させるた
めに、シール材55を挿入するといった複雑な作業が必要
となり、製造コストが増加する不都合がある。However, in the drum container in which the mounting member 53 is inserted and attached to the inner wall side of the flange portion 52 as described above, it is necessary that the flange portion 52 and the mounting member 53 are securely fixed. . That is, if the fixing of the flange portion 52 and the mounting member 53 is incomplete, the contents may leak from the gap between them. Also, the opening
When removing the plug that blocked 51, the mounting member 53 and the plug may rotate together, and the plug may not be removed from the mounting member 53. Therefore, the flange
When the mounting member 53 is inserted into the 52, a complicated work such as inserting the sealing material 55 is required to securely fix the mounting member 53 to the flange portion 52 and to bring the mounting member 53 into complete contact. Has the disadvantage of increasing.
【０００５】また、図示するように前記取付け部材53が
フランジ部52の内壁側に挿着されているドラム容器にお
いては、前記取付け部材53の基端部周縁56が天板50内面
に突出した状態となって段差部57を形成する。このた
め、内容物を取出すときに該内容物が該段差部57に侵入
して付着し、ドラム容器を完全に空にすることができな
いだけでなく、例えば、一度使用したドラム容器を再度
使用する際に、該ドラム容器の内部を洗浄する作業が行
われるが、前記段差部57に残存した内容物の洗浄が困難
となる不都合がある。Further, as shown in the figure, in the drum container in which the mounting member 53 is inserted into the inner wall side of the flange portion 52, the base end peripheral edge 56 of the mounting member 53 is projected to the inner surface of the top plate 50. To form the step portion 57. Therefore, when the contents are taken out, the contents enter and adhere to the step portion 57 and the drum container cannot be completely emptied, and for example, the drum container that has been used once is reused. At this time, an operation of cleaning the inside of the drum container is performed, but there is a disadvantage that it is difficult to clean the contents remaining in the step portion 57.
【０００６】そこで、別部材としての前記取付け部材を
不要として、天板の材料のみで開口部を成形する、米国
特許第4,852,238 号（特開平1-313119号公報) に示され
るような天板の製造方法が知られている。Therefore, the top plate as shown in US Pat. No. 4,852,238 (Japanese Patent Laid-Open No. 1-313119), in which the mounting member as a separate member is unnecessary and the opening is formed only by the material of the top plate, is disclosed. Manufacturing methods are known.
【０００７】この種の天板の製造方法によると、先ず、
前記天板の開口部の成形位置を上方に隆起させてその頂
部が平坦のディスク部を成形し、該ディスク部の中央部
分からその周縁に天蓋素材を絞り寄せる。そして、該デ
ィスク部の頂部に前記開口部より小径の円孔を穿設す
る。次いで、前記ディスク部の周縁に絞り寄せられた天
板素材を上方に絞り上げて起立した円筒状のフランジ部
を成形する。同時に、前記円孔の内径は外方に拡径され
る。続いて、該フランジ部の先端周縁の全周を上下方向
から圧縮して該フランジ部の肉厚を厚く成形する。そし
て、該フランジ部の内壁面に雌ネジを形成する。According to the manufacturing method of this kind of top plate, first,
The molding position of the opening portion of the top plate is raised upward to form a disk portion having a flat top, and the canopy material is squeezed from the central portion of the disk portion to the peripheral edge thereof. Then, a circular hole having a diameter smaller than that of the opening is formed at the top of the disk portion. Next, the top plate material that has been drawn to the peripheral edge of the disk part is drawn upward to form a standing cylindrical flange part. At the same time, the inner diameter of the circular hole is expanded outward. Subsequently, the entire circumference of the front edge of the flange portion is compressed in the vertical direction to increase the thickness of the flange portion. Then, a female screw is formed on the inner wall surface of the flange portion.
【０００８】このように、前記の製造方法では、開口部
のフランジ部を圧縮してその肉厚を厚くすることによ
り、該フランジ部の強度の向上を図り、該フランジ部の
内壁面に雌ネジを形成して直接口栓を螺着可能とされて
いる。As described above, in the above-described manufacturing method, the flange portion of the opening is compressed to increase its wall thickness to improve the strength of the flange portion, and the internal wall surface of the flange portion is provided with a female screw. It is possible to screw the spout directly to form.
【０００９】これにより、前記取付け部材が不要となっ
てそのコストを削減することができ、更に、ドラム容器
内の洗浄が容易となっている。As a result, the mounting member is not required, the cost can be reduced, and the inside of the drum container can be easily cleaned.
【００１０】このような構造にフランジ部を天板と一体
に成形するためには、製造上、次のような問題がある。In order to integrally form the flange portion with the top plate in such a structure, there are the following problems in manufacturing.
【００１１】通常、ドラム缶の天板素材の材質は、材料
のコストを低くするために、一般に、薄板の鋼板、具体
的には厚さ 1.0〜 1.2mm程度の、熱間圧延軟鋼板のうち
ＪＩＳ規格による一般用のＳＰＨＣ、或いは、冷間圧延
軟鋼板のうちＪＩＳ規格による一般用のＳＰＣＣと呼ば
れる鋼板が使用されている。また、ドラム容器の天板に
は、世界共通の規格として、２インチ（50.8mm) の口栓
が螺着可能な開口部と3/4 インチ(19.05mm) の口栓とが
螺着可能な開口部を備えなければならない。そして、該
ブランジ部の内面に口栓を螺着するための雌ネジを少な
くとも６mm以上の長さで形成するために、フランジ部の
立ち上がりの高さを８mm程度にしなければならない。Generally, the material of the top plate material of a drum can is a thin steel plate, specifically, a JIS-JIS hot-rolled mild steel plate having a thickness of about 1.0 to 1.2 mm in order to reduce the cost of the material. A general-purpose SPHC according to the standard or a cold-rolled mild steel plate called a general-purpose SPCC according to the JIS standard is used. In addition, as a worldwide standard, the top of the drum container can be screwed with an opening that can be screwed in with a 2-inch (50.8 mm) plug and a 3 / 4-inch (19.05 mm) plug. It must have an opening. Further, in order to form a female screw for screwing a spigot on the inner surface of the bulge portion with a length of at least 6 mm or more, the rising height of the flange portion must be about 8 mm.
【００１２】このような条件下で、使用される鋼板のう
ち、1.6 mm未満の板厚で、前記ＳＰＨＣは、３０％の伸
率を有する絞り加工用のＳＰＨＤや、３１％の伸率を有
する深絞り加工用のＳＰＨＥに比して、その伸率が２７
％と伸率が低い。また、同様に板厚1.6 mm未満の板厚
で、ＳＰＣＣは、３９％の伸率を有する絞り加工用のＳ
ＰＣＤや、４１％の伸率を有する深絞り加工用のＳＰＣ
Ｅに比して、その伸率が３７％と他の鋼板に比して伸率
が低い。Under these conditions, among the steel sheets used, with a thickness of less than 1.6 mm, the SPHC has an SPHD for drawing having an elongation of 30% and an elongation of 31%. Its elongation is 27 compared to SPHE for deep drawing.
%, The growth rate is low. Similarly, with a thickness of less than 1.6 mm, SPCC has an S ratio of 39% for drawing.
PCD and SPC for deep drawing with 41% elongation
Compared with E, its elongation is 37%, which is lower than that of other steel sheets.
【００１３】このため、２インチ用のような比較的広口
の開口部の場合はともかく、3/4 インチ用の開口部のた
めに、ＳＰＨＣやＳＰＣＣを材料とし、板厚1.2 mm〜1.
0 mmで、高さ８mmのフランジ部を前記の方法によって成
形すると、材料の伸率が影響する成形時の応力に耐えら
れずに該フランジ部に亀裂等が発生する場合がある。For this reason, SPHC or SPCC is used as the material for the opening for 3/4 inch, regardless of the opening having a relatively wide opening such as for 2 inches, and the plate thickness is 1.2 mm to 1.
When a flange portion having a height of 0 mm and a height of 8 mm is formed by the above-described method, the flange portion may not be able to withstand the stress at the time of forming which is affected by the elongation of the material, and cracks or the like may occur.
【００１４】このフランジ部の内面に形成する雌ネジは
切削により形成するとフランジ部の強度が低下するた
め、ロール機によりこの雌ネジを圧延成形するのが好適
である。しかし、この場合、僅かな亀裂がフランジ部の
先端部に生じたときには、このネジ成形の際に亀裂が更
に進行して、製品として使用することができなくなる。
また、前記のような亀裂が発生していない場合でも、成
形されたフランジ部の厚さが上縁部に従って板厚が薄く
なると、ネジ成形の際にフランジ部に亀裂が発生する不
都合がある。これを防止するために、前記の製造方法で
は、フランジ部を絞り成形した後、フランジ部の上端を
下方へ圧縮することによって、フランジ部の上縁部の板
厚が薄くなることを防止している。しかしながら、この
方法によると、フランジ部の成形工程に加えてフランジ
部の上端を下方に圧縮する工程が必要となり、その装置
が複雑となる不都合がある。If the female screw formed on the inner surface of the flange portion is formed by cutting, the strength of the flange portion is lowered, so it is preferable to roll-mold the female screw by a roll machine. However, in this case, when a slight crack is generated in the tip portion of the flange portion, the crack further progresses during the screw forming, and it cannot be used as a product.
Further, even if the above-described crack does not occur, when the thickness of the formed flange portion becomes thinner along the upper edge portion, there is a disadvantage that the flange portion is cracked during screw forming. In order to prevent this, in the above-described manufacturing method, after the flange portion is drawn, the upper end of the flange portion is compressed downward to prevent the plate thickness of the upper edge portion of the flange portion from becoming thin. There is. However, according to this method, in addition to the step of forming the flange portion, a step of compressing the upper end of the flange portion downward is required, and there is a disadvantage that the apparatus becomes complicated.
【００１５】[0015]
【発明が解決しようとする課題】かかる不都合を解消し
て、本発明は、薄い鋼板を用いて強度の高いフランジ部
を備えた開口部を簡便に成形することができる金属ドラ
ム容器用天板の製造方法及びその装置を提供することを
目的とする。SUMMARY OF THE INVENTION The present invention solves the above inconvenience, and the present invention provides a top plate for a metal drum container capable of easily forming an opening having a flange portion having high strength by using a thin steel plate. It is an object to provide a manufacturing method and an apparatus thereof.
【００１６】[0016]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の製造方法は、所定の高さで上方に向かっ
て起立する所定の内径を有する円筒状のフランジ部が周
縁に形成された開口部を備えた金属ドラム容器の天板の
製造方法において、（ａ）薄板の鋼板からなる天板素材
に前記開口部の内径より小径の円孔を穿設する工程と、
（ｂ）前記天板素材の該円孔の周縁部を略円錐台形状に
上方に隆起させて前記開口部の内径よりも小さい径に拡
径された前記円孔を備え、前記所定の高さより低い第１
の仮フランジ部を成形する工程と、（ｃ）該第１の仮フ
ランジ部の基部の周縁部を第１の仮フランジ部に連続す
る略円錐台形状に上方に隆起させて、その隆起した部分
の下部を前記フランジ部の所定の内径と略等しい径に拡
径した第２の仮フランジ部に成形して、前記第１の仮フ
ランジ部と第２仮フランジ部とにより全体として略円錐
台形状の第３の仮フランジ部を成形する工程と、（ｄ）
該第３の仮フランジ部を上方に起立させて円孔が前記所
定の内径であって前記フランジ部の高さが前記所定の高
さになるように絞り加工する工程と、を含むことを特徴
とする。In order to achieve the above object, in the manufacturing method of the present invention, a cylindrical flange portion having a predetermined inner diameter and standing upward at a predetermined height is formed on the peripheral edge. A method of manufacturing a top plate of a metal drum container having an opening, the step of: (a) forming a circular hole having a diameter smaller than the inner diameter of the opening in a top plate material made of a thin steel plate;
(B) The circular hole of the top plate material is provided with the circular hole whose diameter is smaller than the inner diameter of the opening by bulging the peripheral portion of the circular hole upward in a substantially frustoconical shape, and from the predetermined height. Low first
And (c) the peripheral portion of the base portion of the first temporary flange portion is raised upward into a substantially truncated cone shape continuous with the first temporary flange portion, and the raised portion is formed. A lower part of the second temporary flange part expanded to a diameter substantially equal to a predetermined inner diameter of the flange part, and the first temporary flange part and the second temporary flange part form a substantially truncated cone shape as a whole. Forming a third temporary flange portion of
A step of erecting the third temporary flange portion upward so that the circular hole has the predetermined inner diameter and the height of the flange portion becomes the predetermined height. And
【００１７】また、本発明の装置は、所定の高さで上方
に向かって起立する所定の内径を有する円筒状のフラン
ジ部が周縁に形成された開口部を備えた金属ドラム容器
の天板の製造装置であって、薄板の鋼板からなる天板素
材に前記開口部の内径よりも小径の円孔を穿孔する穿孔
手段と、前記天板素材の該円孔の周縁部に圧接して該円
孔を含む周縁部を略円錐台形状に上方に隆起させて前記
開口部の内径よりも小さい径に拡径された前記円孔を備
え、前記所定の高さより低い第１の仮フランジ部を成形
する第１の成形手段と、該第１の仮フランジ部の基部の
周縁部を第１の仮フランジ部に連続する略円錐台形状に
隆起させて、その隆起した部分の下部を前記フランジ部
の所定の内径と略等しい径に拡径した第２の仮フランジ
部に成形して、第１の仮フランジ部と第２の仮フランジ
部とにより全体として略円錐台形状の台３の仮フランジ
部を成形する第２の成形手段と、該第３の仮フランジ部
を上方に起立させて前記円孔が所定の内径であって前記
フランジ部の高さが前記所定の高さになるように絞り成
形する第３の成形手段と、とからなることを特徴とす
る。Further, the apparatus of the present invention includes a top plate of a metal drum container having an opening formed at a peripheral edge thereof with a cylindrical flange portion having a predetermined inner diameter and standing upward at a predetermined height. A manufacturing apparatus, a punching means for punching a circular hole having a diameter smaller than the inner diameter of the opening in a top plate material made of a thin steel plate, and the circle by press-contacting a peripheral portion of the circular hole of the top plate material. A first provisional flange portion lower than the predetermined height is formed by bulging a peripheral portion including a hole upward in a substantially truncated cone shape and expanding the circular hole to a diameter smaller than the inner diameter of the opening portion. And a peripheral portion of the base portion of the first temporary flange portion is raised in a substantially frusto-conical shape continuous with the first temporary flange portion, and the lower portion of the raised portion is of the flange portion. Mold the second temporary flange that has a diameter approximately equal to the predetermined inner diameter, and Second forming means for forming a temporary flange part of the base 3 having a substantially truncated cone shape as a whole by the temporary flange part and the second temporary flange part, and the third temporary flange part is erected upward and Third forming means for forming by drawing such that the circular hole has a predetermined inner diameter and the height of the flange portion becomes the predetermined height.
【００１８】[0018]
【作用】本発明は、前記の方法及び装置により、前記円
孔の周縁部を上方に隆起させて前記フランジ部の孔径よ
りも小径であって短幅の第１の仮フランジ部を成形し、
同時に円孔を拡径するので、その成形量を小とすること
ができ、成形時における亀裂の発生を抑制する。According to the present invention, by the method and apparatus described above, the peripheral portion of the circular hole is bulged upward to form a first temporary flange portion having a diameter smaller than the hole diameter of the flange portion and having a short width,
At the same time, since the diameter of the circular hole is expanded, the amount of molding can be reduced, and the occurrence of cracks during molding can be suppressed.
【００１９】そして、該第１の仮フランジ部の基部の周
縁部を上方に隆起させて拡大された第２の仮フランジ部
を有する第３の仮フランジ部を成形し、その後、該第３
の仮フランジ部を垂直に起立するように成形しつつ前記
円孔を更に拡径して前記フランジ部を成形するので、前
記仮フランジ部の基部から天板の材料が徐々に上方と拡
径方向に段階的に成形される。Then, the peripheral edge of the base of the first temporary flange is raised upward to form a third temporary flange having an enlarged second temporary flange, and then the third temporary flange is formed.
While forming the temporary flange portion so as to stand vertically, the diameter of the circular hole is further expanded to form the flange portion, so that the material of the top plate gradually increases from the base portion of the temporary flange portion in the radial direction. It is molded in stages.
【００２０】[0020]
【実施例】本発明の一実施例を図面に基づいて説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
【００２１】本実施例は、金属ドラム容器の天板の製造
方法における開口部の製造方法及びその装置を示すもの
である。The present embodiment shows a method of manufacturing an opening and a device therefor in a method of manufacturing a top plate of a metal drum container.
【００２２】図１は本実施例によって製造された天板の
要部を示す平面図、図２は図１のII−II線断面図、図３
は本実施例で採用した成形装置の説明的断面図、図４は
図３の要部拡大図、図５乃至図８は本実施例の工程を示
す説明図である。FIG. 1 is a plan view showing a main part of a top plate manufactured according to this embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
Is an explanatory sectional view of the molding apparatus adopted in the present embodiment, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIGS. 5 to 8 are explanatory views showing steps of the present embodiment.
【００２３】図１及び図２に示すように、本実施例によ
って製造される円盤状の天板１の開口部２は、上方に向
かって起立する円筒状のフランジ部３が天板１と一体に
形成され且つ該フランジ部３の内壁面に雌ネジ４が形成
されている。該開口部２には、外周に雄ネジが形成され
た図示しない口栓が脱着自在となっている。As shown in FIGS. 1 and 2, in the opening 2 of the disk-shaped top plate 1 manufactured according to this embodiment, the cylindrical flange portion 3 standing upright is integrated with the top plate 1. And a female screw 4 is formed on the inner wall surface of the flange portion 3. A spigot (not shown) having a male screw formed on the outer periphery thereof can be freely attached to and detached from the opening 2.
【００２４】この天板１の素材としては、ＳＰＣＣまた
はＳＰＨＣで板厚ｔ1 が1.2 mmを用いている。そして、
フランジ部３の天板１からの高さｔ2 を８mmとし、フラ
ンジ部３の内径ｔ3 を通常の３／４インチの口栓が螺着
することができる大きさ(25.1 mm) とし、雌ネジ４の形
成長さｔ4 をピッチ1/14インチで６mmとした。The top plate 1 is made of SPCC or SPHC and has a plate thickness t 1 of 1.2 mm. And
The height t 2 of the flange portion 3 from the top plate 1 is set to 8 mm, and the inner diameter t 3 of the flange portion 3 is set to a size (25.1 mm) at which a usual 3/4 inch plug can be screwed, and the formation length t 4 of the screw 4 and the 6mm at a pitch 1/14 inch.
【００２５】前記開口部２は、例えば、図３に示すよう
な成形装置５を用いて成形される。該成形装置５は、図
３に示すように、管状の挿通孔６を有する下ダイ部７
が、バネ８によって上方に付勢されて下ベース部９に設
けられている。該下ベース部９の中央部に起立して固定
された円柱状の中ダイ部10が、前記挿通孔６内に貫通自
在に挿通されている。該中ダイ部10は、前記下ダイ部７
が下方に移動することにより、下ダイ部７の上方に突出
する。該中ダイ部10はその上部に肩部11が形成されてお
り、該肩部11より更に上部の頂部12は縮径された形状と
なっている。また、該中ダイ部10及び下ベース部９に
は、その中央を貫通する貫通孔13が形成されている。中
ダイ部10の基部の外径は図４示のように前記ｔ3 と同じ
である。The opening 2 is molded using, for example, a molding device 5 as shown in FIG. As shown in FIG. 3, the molding device 5 includes a lower die portion 7 having a tubular insertion hole 6.
Is provided on the lower base portion 9 by being urged upward by the spring 8. A cylindrical middle die portion 10 which is erected and fixed at the center of the lower base portion 9 is inserted into the insertion hole 6 so as to be freely penetrated. The middle die portion 10 is the lower die portion 7
Moves downward, and thus projects above the lower die portion 7. A shoulder portion 11 is formed on the upper portion of the middle die portion 10, and a top portion 12 further above the shoulder portion 11 has a reduced diameter. Further, the middle die portion 10 and the lower base portion 9 are formed with a through hole 13 penetrating through the centers thereof. The outer diameter of the base portion of the middle die portion 10 is the same as t 3 as shown in FIG.
【００２６】一方、前記下ダイ部７に対向してその上方
には、前記開口部２の径に対応する管状の成形部14を有
する上ダイ部15が、案内部材16を介してバネ17によって
下方に付勢されて上ベース部18に設けられている。該案
内部材16は、その下端部中央に突出する穿孔部材19が固
定されており、該穿孔部材19の外径は前記中ダイ部10の
貫通孔13に対応して該貫通孔に挿通可能となっている。
前記上ベース部18は、図示しない駆動手段によって下方
に移動される。On the other hand, an upper die portion 15 having a tubular shaped portion 14 corresponding to the diameter of the opening 2 is provided above the lower die portion 7 and above the lower die portion 7 by a spring 17 via a guide member 16. It is urged downward and provided on the upper base portion 18. The guide member 16 is fixed with a punching member 19 projecting at the center of the lower end thereof, and the outer diameter of the punching member 19 can be inserted into the through hole corresponding to the through hole 13 of the middle die portion 10. Has become.
The upper base portion 18 is moved downward by a driving unit (not shown).
【００２７】更に、中ダイ部10と穿孔部材19とについ
て、図４に従って説明する。Further, the middle die portion 10 and the punching member 19 will be described with reference to FIG.
【００２８】貫通孔13の内径ｔ5 は、成形後のフランジ
部３の高さを規定するものである。内径ｔ5 が小さい
程、フランジ部３の立ち上がり量を大とすることができ
るが、内径ｔ5 が小さすぎて好適でないと成形の際にフ
ランジ部３に亀裂が生じる原因となる。内径ｔ5 は従っ
てフランジ部３の立ち上がり量に応じて適切に設定する
必要があり、フランジ部３の立ち上がり量を８mmとする
ときには、10.5mmが好適である。The inner diameter t 5 of the through hole 13 defines the height of the flange portion 3 after molding. The smaller the inner diameter t 5 , the larger the rising amount of the flange portion 3, but if the inner diameter t 5 is too small, the flange portion 3 may be cracked during molding. Therefore, the inner diameter t 5 must be appropriately set according to the rising amount of the flange portion 3, and when the rising amount of the flange portion 3 is 8 mm, 10.5 mm is preferable.
【００２９】中ダイ部10の頂部12には、所定幅ｔ6 の平
坦面12を備える。該平坦面12ａの貫通孔13側の端縁12b
は、天板素材を穿孔部材19により穿孔するための切り刃
として作用する。このため、所定幅ｔ6 が小さすぎると
頂部12にかかる荷重により中ダイ部10の頂部12が欠損す
る。また、この幅ｔ6が大きすぎると、成形の際にフラ
ンジ部３の先端部に亀裂が発生する。このため、所定幅
ｔ6 は適切な長さであることが必要である。中ダイ部10
の素材をJIS 規格でSKD11,米国規格（AISI ASTM)でD2の
場合、前記のフランジ部３の成形の条件下では1.0 〜1.
5 mm、好ましくは1.2 〜1.3 mmである。The top portion 12 of the middle die portion 10 is provided with a flat surface 12 having a predetermined width t 6 . An edge 12b of the flat surface 12a on the side of the through hole 13
Serves as a cutting blade for piercing the top plate material with the piercing member 19. Therefore, if the predetermined width t 6 is too small, the top portion 12 of the middle die portion 10 is broken by the load applied to the top portion 12. If the width t 6 is too large, cracks will occur at the tip of the flange 3 during molding. Therefore, the predetermined width t 6 needs to be an appropriate length. Middle die part 10
When the material of JIS is SKD11 according to JIS standard and D2 according to American standard (AISI ASTM), it is 1.0-1.
It is 5 mm, preferably 1.2 to 1.3 mm.
【００３０】中ダイ部10の肩部11の外周面には、図４示
のように、大別して３つ曲面部R1,R 2,R3が全周に形成さ
れている。最上方にある第１の曲面部R1は前記頂部12の
平坦面12a に連なり外方に湾曲する曲面を備える。第２
の曲面部R2は下方にあり外方に彎曲する曲面を備える。
第３の曲面部R3は第１の曲面部R1と第２の曲面部R2との
間にあり、内方に彎曲する曲面を備える。The outer peripheral surface of the shoulder portion 11 of the middle die portion 10 is shown in FIG.
, The curved surface R1, R 2, R3Is formed all around
Has been. First curved surface R at the top1Of the top 12
A curved surface that is continuous with the flat surface 12a and curves outward is provided. Second
Curved surface R2Has a curved surface that is downward and bends outward.
Third curved surface R3Is the first curved surface R1And the second curved surface R2With
There is a curved surface in between and curved inward.
【００３１】第１の曲面部R1及び第２の曲面部R2は基本
的にはその外径より小さい穿孔部材19により穿孔された
円孔20の周縁部を上方に絞りながら略円錐台形状に隆起
させると共に拡径方向に圧延する部分である。即ち、図
４仮想線示のように、穿孔された円孔20の周縁部の成形
の過程は、実質的には第１の曲面部R1及び第２の曲面部
R2に沿って行われる。このとき、最初は第３の曲面部R3
には天板素材が接していない。その後、図４仮想線示の
ように、円孔20の周端部が第３の曲面部R3を通過する際
に、該周縁部がそのスプリングバックにより第３の曲面
部R3に接する。該周縁部が第３の曲面部R3上を通過する
ときに、該周縁部が第３の曲面部R3に倣うようになり、
これにより第１の曲面部R1の成形によって開口部２の周
縁部に急激に蓄積した歪みを第３の曲面部R3は一旦開放
させる。そして、その後に、再度、円孔20の周縁部は第
２の曲面部R2により上方に略円錐台形状に隆起させられ
ると共に所定の径まで拡径される。The first curved surface portion R 1 and the second curved surface portion R 2 are basically frusto-conical in shape, with the peripheral edge portion of the circular hole 20 drilled by the drilling member 19 having a smaller outer diameter being drawn upward. It is a part that is raised and rolled in the radial direction. That is, as shown in phantom lines in FIG. 4, the process of forming the peripheral portion of the perforated circular hole 20 is substantially the same as the first curved surface portion R 1 and the second curved surface portion.
Done along R 2 . At this time, first, the third curved surface portion R 3
The top plate material is not in contact with. Then, as shown by the phantom line in FIG. 4, when the peripheral end portion of the circular hole 20 passes through the third curved surface portion R 3 , the peripheral edge portion comes into contact with the third curved surface portion R 3 by its springback. When the peripheral edge portion passes over the third curved surface portion R 3 , the peripheral edge portion follows the third curved surface portion R 3 ,
As a result, the third curved surface portion R 3 temporarily releases the strain that is abruptly accumulated in the peripheral portion of the opening 2 due to the molding of the first curved surface portion R 1 . Then, after that, the peripheral portion of the circular hole 20 is again raised upward by the second curved surface portion R 2 into a substantially truncated cone shape and is expanded to a predetermined diameter.
【００３２】このとき、第１の曲面部R1及び第２の曲面
部R2は、該曲面部R1、R2によって、天板素材が拡径方向
に拡張されるとき、その拡張量をその下部領域において
低減する。At this time, the first curved surface portion R 1 and the second curved surface portion R 2 have an expansion amount when the top plate material is expanded in the radial direction by the curved surface portions R 1 and R 2 . It is reduced in the lower region.
【００３３】このような作用を各曲面部R1,R2,R3がフラ
ンジ部３に亀裂を発生させることなく且つ成形されたフ
ランジ部３の上縁部が実質的に天板素材の板厚と同程度
の厚みを付与して奏するためには、次のような条件を満
たすことが必要である。With such an action, the curved surface portions R 1 , R 2 , R 3 do not cause cracks in the flange portion 3 and the upper edge portion of the formed flange portion 3 is substantially made of a top plate material. It is necessary to satisfy the following conditions in order to give the same thickness as the thickness.
【００３４】平坦面12a と第１の曲面部R1と第３の曲面
部R3の中間位置までの上方部分（領域Ａ）と、第３の曲
面部R3の中間位置から下方の部分と第２の曲面部R2（Ｂ
領域）における成形量は、次の関係がある。An upper portion (area A) up to the intermediate position between the flat surface 12a, the first curved surface portion R 1 and the third curved surface portion R 3 , and a portion below the intermediate position of the third curved surface portion R 3. Second curved surface R 2 (B
The molding amount in the area) has the following relationship.
【００３５】領域Ａの拡径方向の成形量は、領域Ｂの拡
径方向の成形量より大である。具体的には領域Ａにおい
ては拡径方向の全成形量の55〜65％、好ましくは60％、
領域Ｂにおいては全成形量の45〜35％、好ましくは40％
とする。該領域Ａの成形が65％以上であると成形の際に
亀裂が生じ易くなり、55％以下では所定の高さが得られ
難い。The molding amount of the region A in the radial direction is larger than the molding amount of the region B in the radial direction. Specifically, in the region A, 55 to 65%, preferably 60% of the total molding amount in the radial direction,
In region B, 45-35% of the total molding amount, preferably 40%
And If the molding of the region A is 65% or more, cracks are likely to occur during molding, and if it is 55% or less, it is difficult to obtain a predetermined height.
【００３６】また、領域Ａの高さ方向の成形量は、領域
Ｂの高さ方向の成形量と略等しいかそれ以下である。具
体的には領域Ａにおいては高さ方向の全成形量の40〜50
％、好ましくは45〜49％、領域Ｂにおいては高さ方向の
全成形量の50〜60％、好ましくは55〜51％とする。該領
域Ａの成形量が40％以下では所定の高さが得られ難く、
50％以上では亀裂が生じ易い。The molding amount in the height direction of the region A is substantially equal to or less than the molding amount in the height direction of the region B. Specifically, in area A, the total molding amount in the height direction is 40 to 50
%, Preferably 45 to 49%, and in the region B, 50 to 60%, preferably 55 to 51% of the total molding amount in the height direction. If the molding amount of the region A is 40% or less, it is difficult to obtain a predetermined height,
If it exceeds 50%, cracks are likely to occur.
【００３７】このとき、領域Ａの拡径方向の長さｔ
7 は、前記のフランジ部３の絞りの条件下では、4.0 〜
4.8 mm、領域Ｂの長さｔ8 は3.3 〜2.6 mmであり、領域
Ａの高さ方向の長さｔ9 は3.8 〜4.8 mm、領域Ｂの長さ
ｔ10は4.8 〜5.7 mmである。At this time, the length t of the area A in the radial direction is increased.
7 is 4.0 to 4.0 under the condition of the above-mentioned restriction of the flange portion 3.
The length t 8 of the region B is 3.3 to 2.6 mm, the length t 9 of the region A in the height direction is 3.8 to 4.8 mm, and the length t 10 of the region B is 4.8 to 5.7 mm.
【００３８】また、このとき、第１の曲面部R1の曲率r1
は、第２の曲面部R2の曲率ｒ2 より小さいことが好まし
く、第３の曲面部R3の曲率ｒ3 は曲率r1と曲率ｒ2 より
大であることが好ましい。前記のフランジ部３の条件下
では、曲率r1の半径が5.０〜7.0 mm、曲率ｒ2 の半径が
6.0 〜8.0 mm、曲率ｒ3 の半径は8.0 〜12.0mmである。At this time, the curvature r 1 of the first curved surface portion R 1
Is preferably smaller than the curvature r 2 of the second curved portion R 2, it is preferred third curvature r 3 of the curved portion R 3 is greater than the curvature r 1 and the curvature r 2. Under the condition of the flange portion 3, the radius of curvature r 1 is 5.0 to 7.0 mm and the radius of curvature r 2 is
The radius of the curvature r 3 is 6.0 to 8.0 mm, and the radius is 8.0 to 12.0 mm.
【００３９】更に、フランジ部３に亀裂を発生させるこ
となく成形するためには、天板素材の円孔20を穿設する
ときに、前記穿円孔材19と中ダイ部10の貫通孔13の端縁
との間隙を極めて小さいものとすることが好ましい。こ
の間隙ｔ11は0.03〜0.05mmであることが好ましい。この
間隙ｔ11が大きいと前記穿円孔材19と中ダイ部10の貫通
孔13の端縁とによって切断された円孔20の端縁が貫通孔
13の内方に巻き込まれ、円孔20の端縁の拡径を阻害する
要因となる。Further, in order to form the flange portion 3 without causing cracks, when forming the circular hole 20 of the top plate material, the circular hole material 19 and the through hole 13 of the middle die portion 10 are formed. It is preferable to make the gap with the edge of the extremely small. It is preferred that the gap t 11 is 0.03～0.05Mm. If this gap t 11 is large, the edge of the circular hole 20 cut by the circular hole material 19 and the edge of the through hole 13 of the middle die portion 10 is a through hole.
It is caught inside 13 and becomes a factor that hinders the diameter expansion of the edge of the circular hole 20.
【００４０】該成形装置５を用いた前記開口部２のフラ
ンジ部３の成形を順を追って図３、図４及び図５乃至図
８に従って説明すれば次の通りである。The molding of the flange portion 3 of the opening 2 using the molding device 5 will be described in order with reference to FIGS. 3, 4 and 5 to 8.
【００４１】先ず、図３に示すように、前記下ダイ部７
の上面に、前記天板１の開口部２を成形する位置と前記
挿通孔６とを対応させて、該天板素材１を載置する。First, as shown in FIG. 3, the lower die portion 7
The top plate material 1 is placed on the upper surface of the top plate 1 so that the position where the opening 2 of the top plate 1 is formed and the insertion hole 6 correspond to each other.
【００４２】次いで、図５に示すように、前記上ベース
部18を下方に移動させて、前記上ダイ部15と下ダイ部７
とで互いに押圧して天板素材１を挟持する。そして、更
に上ベース部18を下方に移動させて、前記穿孔部材19を
前記中ダイ部10の貫通孔13に挿通させる。これにより、
天板素材１には、円孔20が穿設される。形成される該円
孔20の径は、前記したように貫通孔13が前記開口部２の
内径に対応する中ダイ部10の外径よりも小径である。
次いで、図６に示すように、更に上ベース部18を下方に
移動させて下ダイ部７を下方に押し下げ、前記中ダイ部
10を下ダイ部７の上方に突出させる。これにより、前記
円孔20の周縁部は、前記中ダイ部10の肩部11の領域Ａよ
り押し上げられて隆起し、同時に、該円孔20の周縁部
は、拡径方向に押し広げられて略円錐台形状の第１の仮
フランジ部21が成形される。これにより、該第１の仮フ
ランジ部21は、前記開口部２に形成されるフランジ部３
よりも小径且つ短幅に成形される。 続いて、図７に示
すように、更に上ベース部18を下方に移動させて下ダイ
部７を更に下方に押し下げ、前記中ダイ部10を下ダイ部
７の上方に更に突出させる。これにより、該第１の仮フ
ランジ部21の基部の周縁部は、前記中ダイ部10の肩部11
の領域Ｂによって押し上げられて隆起し、同時に拡径方
向に押し広げられて第１の仮フランジ部21の下部にこれ
に連なって略円錐台形状の第２の仮フランジ部22が成形
される。これにより、第１の仮フランジ部21と第２の仮
フランジ部22とによって全体として略円錐台形状の第３
の仮フランジ部23が形成される。この第３の仮フランジ
部23の下部は前記フランジ部２の所定の内径近傍まで拡
径される。Then, as shown in FIG. 5, the upper base portion 18 is moved downward so that the upper die portion 15 and the lower die portion 7 are moved.
And press each other to clamp the top plate material 1. Then, the upper base portion 18 is further moved downward so that the punching member 19 is inserted into the through hole 13 of the middle die portion 10. This allows
A circular hole 20 is formed in the top plate material 1. The diameter of the circular hole 20 formed is smaller than the outer diameter of the middle die portion 10 in which the through hole 13 corresponds to the inner diameter of the opening 2 as described above.
Then, as shown in FIG. 6, the upper base portion 18 is further moved downward to push the lower die portion 7 downward,
10 is projected above the lower die part 7. As a result, the peripheral portion of the circular hole 20 is pushed up from the region A of the shoulder portion 11 of the middle die portion 10 to be raised, and at the same time, the peripheral portion of the circular hole 20 is expanded in the radial direction. The first temporary flange portion 21 having a substantially truncated cone shape is formed. As a result, the first temporary flange portion 21 becomes the flange portion 3 formed in the opening 2.
Smaller diameter and shorter width. Subsequently, as shown in FIG. 7, the upper base portion 18 is further moved downward to push the lower die portion 7 further downward, and the middle die portion 10 is further projected above the lower die portion 7. As a result, the peripheral portion of the base portion of the first temporary flange portion 21 is the shoulder portion 11 of the middle die portion 10.
The region B is pushed up and raised, and at the same time, it is pushed out in the diameter expanding direction to form a second temporary flange 22 having a substantially truncated cone shape under the first temporary flange 21 in a continuous manner. As a result, the first temporary flange portion 21 and the second temporary flange portion 22 form a third truncated cone-shaped third overall.
The temporary flange portion 23 is formed. The lower portion of the third temporary flange portion 23 is expanded to the vicinity of a predetermined inner diameter of the flange portion 2.
【００４３】その後、図８に示すように、更に上ベース
部18を下方に移動させて下ダイ部７を更に下方に押し下
げ、前記中ダイ部10を下ダイ部７の上方に更に突出させ
る。これにより、中ダイ部10の肩部11よりも下部の外壁
部23と、前記上ダイ部15の成形部14とによって、該第３
の仮フランジ23が絞り成形されて前記フランジ部３が成
形される。Thereafter, as shown in FIG. 8, the upper base portion 18 is further moved downward to push the lower die portion 7 further downward, and the middle die portion 10 is further projected above the lower die portion 7. As a result, the outer wall portion 23 below the shoulder portion 11 of the middle die portion 10 and the molding portion 14 of the upper die portion 15 allow the third die
The temporary flange 23 is drawn and the flange portion 3 is formed.
【００４４】そして以上のように、該フランジ部３は、
前記中ダイ部10の頂部12、肩部11、外壁部23の段階的な
成形により、フランジ部３に亀裂が発生することを防止
すると共に実質的に天板素材の板厚と同じ程度の板厚の
フランジ部３が形成される。As described above, the flange portion 3 is
By forming the top portion 12, shoulder portion 11 and outer wall portion 23 of the middle die portion 10 stepwise, it is possible to prevent cracks from occurring in the flange portion 3 and to make the plate substantially the same thickness as the top plate material. The thick flange portion 3 is formed.
【００４５】そして、該フランジ部３の内面側に、図示
しないネジ成形ロール等によって、図２示の雌ネジ４を
形成して、前記フランジ部３を有する前記開口部２が形
成される。On the inner surface side of the flange portion 3, a female screw 4 shown in FIG. 2 is formed by a screw forming roll or the like (not shown) to form the opening 2 having the flange portion 3.
【００４６】[0046]
【発明の効果】本発明は、前記の方法及び装置により、
前記円孔の周縁部を上方に隆起させて前記フランジ部の
孔径よりも小径であって短幅の第１の仮フランジ部を成
形し、同時に円孔を拡径するので、その成形量を小とす
ることができ、成形時における亀裂の発生を抑制するこ
とができる。The present invention provides the above-mentioned method and device.
The peripheral portion of the circular hole is raised upward to form a first temporary flange portion having a diameter smaller than the hole diameter of the flange portion and having a short width, and at the same time, the diameter of the circular hole is expanded. Therefore, the occurrence of cracks during molding can be suppressed.
【００４７】そして、該第１の仮フランジ部の基部を上
方に隆起させて拡大された第２の仮フランジ部を有する
第３の仮フランジ部を成形し、その後、該第３の仮フラ
ンジ部を垂直に起立するように成形しつつ前記円孔を更
に拡径して前記フランジ部を成形するので、前記仮フラ
ンジ部の基部から天板の材料が徐々に上方と拡径方向に
段階的に成形され、該フランジ部の急激な肉薄化を防止
することができる。Then, the base portion of the first temporary flange portion is bulged upward to form a third temporary flange portion having an enlarged second temporary flange portion, and then the third temporary flange portion is formed. Since the flange portion is formed by further expanding the diameter of the circular hole while molding so as to stand upright, the material of the top plate gradually increases from the base portion of the temporary flange portion in the upward and expanding directions. It is formed, and it is possible to prevent a sudden thinning of the flange portion.
【００４８】従って、本発明によれば、フランジ部の端
縁部に亀裂等が発生することなく、強度が向上したフラ
ンジ部を備えた開口部の成形が可能な金属ドラム容器用
天板を製造することができる。Therefore, according to the present invention, a top plate for a metal drum container is manufactured which is capable of forming an opening portion having a flange portion with improved strength without causing cracks or the like at the edge portion of the flange portion. can do.
【図１】本実施例によって製造された天板の要部を示す
平面図。FIG. 1 is a plan view showing a main part of a top plate manufactured according to this embodiment.
【図２】図１のII−II線断面図。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】本実施例で採用した成形装置の説明的断面図。FIG. 3 is an explanatory cross-sectional view of a molding device adopted in this embodiment.
【図４】図３の要部の拡大図。FIG. 4 is an enlarged view of a main part of FIG.
【図５】本実施例の工程を示す説明図。FIG. 5 is an explanatory view showing the process of the present embodiment.
【図６】本実施例の工程を示す説明図。FIG. 6 is an explanatory diagram showing a process of this embodiment.
【図７】本実施例の工程を示す説明図。FIG. 7 is an explanatory diagram showing a process of this example.
【図８】本実施例の工程を示す説明図。FIG. 8 is an explanatory diagram showing a process of this example.
【図９】従来の天板の開口部を示す説明的断面図。FIG. 9 is an explanatory cross-sectional view showing an opening of a conventional top plate.
１…天板、２…開口部、３…フランジ部、10…第１のダ
イ、15…第２のダイ、19…穿孔手段、20…円孔、21…第
１仮フランジ部、22…第２仮フランジ部、23…第３仮フ
ランジ部、Ａ…第１成形手段、Ｂ…第２成形手段、R1…
第１の曲面部、R2…第２の曲面部、R3…第３の曲面部。DESCRIPTION OF SYMBOLS 1 ... Top plate, 2 ... Opening part, 3 ... Flange part, 10 ... 1st die, 15 ... 2nd die, 19 ... Punching means, 20 ... Circular hole, 21 ... 1st temporary flange part, 22 ... 2 provisional flange portion, 23 ... third temporary flange portion, A ... first shaping means, B ... second shaping means, R 1 ...
The first curved portion, R 2 ... second curved portion, R 3 ... third curved portion.
Claims (12)
の内径を有する円筒状のフランジ部が周縁に形成された
開口部を備えた金属ドラム容器の天板の製造方法におい
て、（ａ）薄板の鋼板からなる天板素材に前記開口部の
内径より小径の円孔を穿設する工程と、（ｂ）前記天板
素材の該円孔の周縁部を該円孔を含んで略円錐台形状に
上方に隆起させて前記開口部の内径よりも小さい径に拡
径された前記円孔を備え、前記所定の高さより低い第１
の仮フランジ部を成形する工程と、（ｃ）該第１の仮フ
ランジ部の基部の周縁部を第１の仮フランジ部に連続す
る略円錐台形状に上方に隆起させて、その隆起した部分
の下部を前記フランジ部の所定の内径と略等しい径に拡
径した第２の仮フランジ部に成形して、前記第１の仮フ
ランジ部と第２仮フランジ部とにより全体として略円錐
台形状の第３の仮フランジ部を成形する工程と、（ｄ）
該第３の仮フランジ部を上方に起立させて円孔が前記所
定の内径であって前記フランジ部の高さが前記所定の高
さになるように絞り加工する工程と、を含むことを特徴
とする金属ドラム容器の天板の製造方法。1. A method for manufacturing a top plate of a metal drum container, comprising: an opening formed at a peripheral edge of a cylindrical flange portion having a predetermined inner diameter and standing upward at a predetermined height. ) A step of forming a circular hole having a diameter smaller than the inner diameter of the opening in a top plate material made of a thin steel plate; and (b) a peripheral portion of the circular hole of the top plate material, which includes the circular hole, and is substantially conical. A first lower position than the predetermined height, which includes the circular hole that is raised in a trapezoidal shape and is expanded to a diameter smaller than the inner diameter of the opening;
And (c) the peripheral portion of the base portion of the first temporary flange portion is raised upward into a substantially truncated cone shape continuous with the first temporary flange portion, and the raised portion is formed. A lower part of the second temporary flange part expanded to a diameter substantially equal to a predetermined inner diameter of the flange part, and the first temporary flange part and the second temporary flange part form a substantially truncated cone shape as a whole. Forming a third temporary flange portion of
A step of erecting the third temporary flange portion upward so that the circular hole has the predetermined inner diameter and the height of the flange portion becomes the predetermined height. And a method for manufacturing a top plate of a metal drum container.
ジ部をその下部から次第に上方に起立させる工程と、該
第２の仮フランジ部を起立させるときに、前記第１の仮
フランジ部をその下部から次第に前記第２の仮フランジ
部の形状に成形する工程と、該第２の仮フランジ部の形
状に成形された前記第１の仮フランジ部をその下部から
次第に上方へ起立させる工程からなる請求項１記載の方
法。2. The step (d) comprises a step of gradually raising the second temporary flange portion upward from a lower portion thereof, and a step of raising the second temporary flange portion when the second temporary flange portion is raised. A step of gradually forming the flange portion from its lower portion into the shape of the second temporary flange portion; and a step of gradually raising the first temporary flange portion formed into the shape of the second temporary flange portion upward from the lower portion thereof. The method according to claim 1, which comprises the step of:
フランジ部をその下部から次第に前記第２の仮フランジ
部の形状に成形する際に、前記円孔の周縁部において、
その拡径によって生じる歪みの一部が一旦開放される請
求項２記載の方法。3. In the step (d), when the first temporary flange portion is gradually formed into a shape of the second temporary flange portion from its lower portion, at the peripheral edge portion of the circular hole,
The method according to claim 2, wherein a part of the strain caused by the diameter expansion is once released.
基部が円柱形状を備え、その頭部に上部が前記第１の仮
フランジ部の内面形状と同じ形状を備え、該上部に連な
ってその下部に前記第２の仮フランジ部の内面形状と同
じ形状を備える第１のダイと、該第１のダイの基部に挿
入自在の円孔を備えた第２のダイとによって行われる請
求項１記載の方法。4. The steps of (b), (c) and (d),
The base has a cylindrical shape, and the head has an upper part having the same shape as the inner surface shape of the first temporary flange portion, and the lower part is connected to the upper part and has the same shape as the inner surface shape of the second temporary flange portion. The method of claim 1, wherein the method is performed by a first die having a first die and a second die having a circular hole insertable into the base of the first die.
の内径を有する円筒状のフランジ部が周縁に形成された
開口部を備えた金属ドラム容器の天板の製造装置であっ
て、薄板の鋼板からなる天板素材に前記開口部の内径よ
りも小径の円孔を穿孔する穿孔手段と、前記天板素材の
該円孔の周縁部に圧接して該円孔を含む周縁部を略円錐
台形状に上方に隆起させて前記開口部の内径よりも小さ
い径に拡径された前記円孔を備え、前記所定の高さより
低い第１の仮フランジ部を成形する第１の成形手段と、
該第１の仮フランジ部の基部の周縁部を第１の仮フラン
ジ部に連続する略円錐台形状に隆起させて、その隆起し
た部分の下部を前記フランジ部の所定の内径と略等しい
径に拡径した第２の仮フランジ部に成形して、第１の仮
フランジ部と第２の仮フランジ部とにより全体として略
円錐台形状の第３の仮フランジ部を成形する第２の成形
手段と、該第３の仮フランジ部を上方に起立させて前記
円孔が所定の内径であって前記フランジ部の高さが前記
所定の高さになるように絞り成形する第３の成形手段
と、からなることを特徴とする金属ドラム容器の天板の
製造装置。5. An apparatus for manufacturing a top plate of a metal drum container, which has an opening formed at a peripheral edge of a cylindrical flange portion having a predetermined inner diameter and standing upward at a predetermined height, comprising: A punching means for punching a circular hole having a diameter smaller than the inner diameter of the opening in a top plate material made of a thin steel plate, and a peripheral edge part including the circular hole by press-contacting the peripheral edge part of the circular hole of the top plate material. First forming means for forming a first temporary flange portion having a circular truncated cone shape that is raised upward and has a diameter that is smaller than the inner diameter of the opening, and that is lower than the predetermined height. When,
The peripheral portion of the base portion of the first temporary flange portion is raised in a substantially truncated cone shape continuous with the first temporary flange portion, and the lower portion of the raised portion has a diameter substantially equal to the predetermined inner diameter of the flange portion. Second forming means for forming a second temporary flange portion having an increased diameter, and forming a third temporary flange portion having a substantially truncated cone shape as a whole by the first temporary flange portion and the second temporary flange portion. And a third forming means for erecting the third temporary flange portion upward so that the circular hole has a predetermined inner diameter and the height of the flange portion is the predetermined height. An apparatus for manufacturing a top plate of a metal drum container, comprising:
の下部に前記第２の成形手段が設けられ、該第１の成形
手段が前記第１の仮フランジ部の内面形状と同じ形状を
備え、該第２の成形手段が前記第２の仮フランジ部の内
面形状と同じ形状を備えているダイである請求項５記載
の製造装置。6. The first molding means is provided on an upper part, and the second molding means is provided on a lower part thereof, and the first molding means has the same shape as the inner surface shape of the first temporary flange portion. 6. The manufacturing apparatus according to claim 5, wherein the second molding means is a die having the same shape as the inner surface shape of the second temporary flange portion.
り大である平坦面を備え、前記第１の成形手段が該平坦
面に連なって外方に突出する第１の曲面部を備え、第２
の成形手段が外方に突出する第２の曲面部を備える請求
項６の製造装置。7. The first curved surface portion, wherein the die has a flat surface on its top surface, the flat surface having a diameter larger than the inner diameter of the circular hole, and the first molding means is continuous with the flat surface and projects outward. Equipped with a second
7. The manufacturing apparatus according to claim 6, wherein the molding means includes a second curved surface portion protruding outward.
間に内方に突出する第３の曲面部が設けられている請求
項７記載の製造装置。8. The manufacturing apparatus according to claim 7, wherein a third curved surface portion projecting inward is provided between the first curved surface portion and the second curved surface portion.
曲面部の曲率の半径より小である請求項８記載の製造装
置。9. The manufacturing apparatus according to claim 8, wherein the radius of curvature of the first curved surface portion is smaller than the radius of curvature of the second curved surface portion.
の曲面部の曲率の半径より小であり、第３の曲面部の曲
率の半径が、第１、第２の曲面部の曲率半径よりも大で
ある請求項９記載の製造装置。10. The radius of curvature of the first curved surface portion is the second radius.
10. The manufacturing apparatus according to claim 9, wherein the radius of curvature of the curved surface portion is smaller than the radius of curvature of the third curved surface portion, and the radius of curvature of the third curved surface portion is larger than the radius of curvature of the first and second curved surface portions.
基部が円柱形状を備え、その頭部に前記第１の仮フラン
ジ部の内面形状と同じ形状を備え、該上部に連なってそ
の下部に前記第２の仮フランジ部の内面形状と同じ形状
を備えた第１のダイと、該第１のダイの基部を挿通自在
とする円孔とを備えた第２のダイとからなる請求項５記
載の製造装置。11. The first, second, and third molding means comprise:
The base portion has a cylindrical shape, the head portion has the same shape as the inner surface shape of the first temporary flange portion, and the lower portion is connected to the upper portion and has the same shape as the inner surface shape of the second temporary flange portion. 6. The manufacturing apparatus according to claim 5, comprising a first die and a second die having a circular hole that allows the base of the first die to be inserted therethrough.
と、前記第１のダイの頂部に開口し、第３のダイが挿通
自在の孔部とからなる請求項１１記載の製造装置。12. The manufacturing apparatus according to claim 11, wherein said punching means comprises a cylindrical third die and a hole which is opened at the top of said first die and through which said third die can be inserted. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3187735A JPH05344A (en) | 1990-08-23 | 1991-07-26 | Method and apparatus for manufacturing top plate for metal drum container |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22192890 | 1990-08-23 | ||
| JP2-221928 | 1990-08-23 | ||
| JP3187735A JPH05344A (en) | 1990-08-23 | 1991-07-26 | Method and apparatus for manufacturing top plate for metal drum container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05344A true JPH05344A (en) | 1993-01-08 |
Family
ID=26504529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3187735A Pending JPH05344A (en) | 1990-08-23 | 1991-07-26 | Method and apparatus for manufacturing top plate for metal drum container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05344A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008036656A (en) * | 2006-08-03 | 2008-02-21 | Hirotec Corp | Apparatus and method of forming flange |
| JP2014172089A (en) * | 2013-03-13 | 2014-09-22 | Nippon Steel & Sumitomo Metal | Bar ring processing punch and bar ring processing method |
| JP2017507781A (en) * | 2013-12-17 | 2017-03-23 | ティッセンクルップ スチール ヨーロッパ アーゲーＴｈｙｓｓｅｎｋｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ Ａｇ | Method and apparatus for manufacturing hot formed wheel disks |
| JP2022079280A (en) * | 2020-11-16 | 2022-05-26 | ダイハツ工業株式会社 | Drilling equipment and drilling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653826A (en) * | 1979-10-05 | 1981-05-13 | Yamato Tekkosho:Kk | Device for burring of metal plate |
| JPS60166125A (en) * | 1984-02-06 | 1985-08-29 | Yamato Tekkosho:Kk | Burring method of ceiling board of container such as drum |
| JPS6395620U (en) * | 1986-12-10 | 1988-06-20 | ||
| JPH01254327A (en) * | 1988-03-31 | 1989-10-11 | Matsushita Electric Ind Co Ltd | Color molding method and mold for heat exchanger fins |
-
1991
- 1991-07-26 JP JP3187735A patent/JPH05344A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653826A (en) * | 1979-10-05 | 1981-05-13 | Yamato Tekkosho:Kk | Device for burring of metal plate |
| JPS60166125A (en) * | 1984-02-06 | 1985-08-29 | Yamato Tekkosho:Kk | Burring method of ceiling board of container such as drum |
| JPS6395620U (en) * | 1986-12-10 | 1988-06-20 | ||
| JPH01254327A (en) * | 1988-03-31 | 1989-10-11 | Matsushita Electric Ind Co Ltd | Color molding method and mold for heat exchanger fins |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008036656A (en) * | 2006-08-03 | 2008-02-21 | Hirotec Corp | Apparatus and method of forming flange |
| JP2014172089A (en) * | 2013-03-13 | 2014-09-22 | Nippon Steel & Sumitomo Metal | Bar ring processing punch and bar ring processing method |
| JP2017507781A (en) * | 2013-12-17 | 2017-03-23 | ティッセンクルップ スチール ヨーロッパ アーゲーＴｈｙｓｓｅｎｋｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ Ａｇ | Method and apparatus for manufacturing hot formed wheel disks |
| JP2022079280A (en) * | 2020-11-16 | 2022-05-26 | ダイハツ工業株式会社 | Drilling equipment and drilling method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3765352A (en) | Combined can and end with means for protecting against severed score | |
| US3477608A (en) | Easy-opening can end having vent means | |
| US5851685A (en) | Rivet in a converted can end, method of manufacture, and tooling | |
| JPS5846369B2 (en) | Method of forming pressure-resistant end walls for containers | |
| US4587827A (en) | Method of sheet metal processing | |
| EP0151298B1 (en) | Shell for can | |
| JPH05344A (en) | Method and apparatus for manufacturing top plate for metal drum container | |
| EP0621091A1 (en) | A method of forming a tubular member | |
| US4258859A (en) | No-fin scored metal ends for containers | |
| US3837524A (en) | Easy opening container wall | |
| US3738528A (en) | Container and a method for producing same | |
| US3545249A (en) | Dimple and method of forming same | |
| EP0472440A2 (en) | Method of and apparatus for manufacturing a top plate for a metallic drum container | |
| US3870001A (en) | Can end with inseparable tear strip | |
| US3688385A (en) | Method of making a riveted jointure | |
| US3812803A (en) | Metal forming | |
| US3460368A (en) | Method of making an apertured dished article | |
| JP7709283B2 (en) | Can lid shell manufacturing method and can lid shell manufacturing device | |
| JPH0252124A (en) | Method and apparatus for burring | |
| JP4163772B2 (en) | Spacer mounting method and structure of synthetic resin molded product | |
| JPH0796138B2 (en) | Seamless can manufacturing method | |
| US3416221A (en) | Method of pre-forming and attaching metal pull tab to metal can end rivet formation | |
| US7162904B2 (en) | Method for producing a bung for a metal cask | |
| JPH07115108B2 (en) | Plastic processing method for cup-shaped members | |
| JPS61209731A (en) | Ironing punch |