JP2002346682A - Method for upset burring of thick plate and its mold - Google Patents

Method for upset burring of thick plate and its mold

Info

Publication number
JP2002346682A
JP2002346682A JP2001155893A JP2001155893A JP2002346682A JP 2002346682 A JP2002346682 A JP 2002346682A JP 2001155893 A JP2001155893 A JP 2001155893A JP 2001155893 A JP2001155893 A JP 2001155893A JP 2002346682 A JP2002346682 A JP 2002346682A
Authority
JP
Japan
Prior art keywords
burring
punch
upsetting
thick plate
boss
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
Application number
JP2001155893A
Other languages
Japanese (ja)
Inventor
Katsuyoshi Hirasawa
勝芳 平澤
Kuniaki Doda
邦明 堂田
Shiko O
志剛 王
Naoki Yokoyama
尚来 横山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pacific Industrial Co Ltd
Taiheiyo Kogyo KK
Original Assignee
Pacific Industrial Co Ltd
Taiheiyo Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pacific Industrial Co Ltd, Taiheiyo Kogyo KK filed Critical Pacific Industrial Co Ltd
Priority to JP2001155893A priority Critical patent/JP2002346682A/en
Publication of JP2002346682A publication Critical patent/JP2002346682A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an efficient method for upset burring of a thick plate, whose deviation of molding thickness is small and whose molding height is high, and a mold used for it. SOLUTION: The method for upset burring of a thick plate characteristically consists of a process to punch a prepared hole for burring in a discoid thick plate material, and a process to mold a boss part, comprising to increase the plate thickness of the burring part by upsetting while holding the periphery of the thick plate material, thereafter to mold the boss part by burring and then to carry out sizing of the boss end by a sleeve punch.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明に属する技術分野】本発明は、穴の周縁に筒状部
を突出成形するバーリング加工方法に係り、特に成形肉
厚の偏差が小さく、成形高さが高く、生産性に優れた厚
板の据込みバーリング加工方法及びその金型に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burring method for projecting a cylindrical portion at the periphery of a hole, and more particularly to a thick plate having a small molding thickness deviation, a high molding height, and excellent productivity. And a mold for the upsetting burring method.

【0002】[0002]

【従来の技術】従来の一般的なバーリング成形は、下穴
の空いた素材をダイスとパンチで押し広げ筒状成形を行
うものであるが、筒部に大きな肉厚偏差を伴い、先端部
では下穴部の伸び限界から割れが生じ易く、割れ防止の
ために成形高さを小さくせざるを得なかった。その肉厚
偏差を少なくする方法として、特開平10−22572
9号公報のバーリング加工方法においては、バーリング
加工に先立ちあらかじめ、材料の下穴部分に当たる個所
を据込み筒状部に似た凸部を後方押し出しで成形してい
る。
2. Description of the Related Art Conventional burring molding is a method in which a material with a pilot hole is pushed and expanded with a die and a punch to form a cylinder. Cracks were apt to occur due to the limit of elongation of the prepared hole, and the molding height had to be reduced to prevent cracks. As a method for reducing the thickness deviation, Japanese Patent Application Laid-Open No.
In the burring method disclosed in Japanese Patent Application Publication No. 9 (1999), prior to burring, a portion corresponding to a prepared hole of a material is formed by extruding a convex portion similar to an upset tubular portion backward.

【0003】また、据込みにより肉厚を増加させる工法
として、特開平6−179029号公報のクラッチ用ピ
ストンの製造方法においては、円板状ブランク中心部の
下穴周辺部にバーリング加工を施してボス部を成形した
後、前記ブランクを回転させながらその外周部を半径方
向内方へ圧縮して肉厚を増加させることにより外周厚肉
部を成形させ、この外周厚肉部の外周面に、成形ローラ
の環状凸型部を押圧して前記シール部材装着用環状溝を
成形するという方法もある。
As a method of increasing the wall thickness by upsetting, in a method of manufacturing a clutch piston disclosed in Japanese Patent Application Laid-Open No. Hei 6-179029, a burring process is performed around a pilot hole in the center of a disc-shaped blank. After forming the boss portion, the outer peripheral portion is compressed inward in the radial direction while rotating the blank to increase the thickness to form an outer peripheral thick portion, and on the outer peripheral surface of the outer peripheral thick portion, There is also a method in which an annular convex portion of a forming roller is pressed to form the seal member mounting annular groove.

【0004】[0004]

【発明が解決しようとする課題】しかし、前者のバーリ
ング加工方法では、成形高さを高くできるというもの
の、バーリング加工によるボス部の肉厚が薄く、また筒
部内壁面にスクラップの剪断跡が残り、変形抵抗の小さ
いコーナー部、また、筒状内側面の面精度が劣化すると
いう問題点があった。
However, in the former burring method, although the molding height can be increased, the thickness of the boss portion due to the burring is thin, and scrap marks of the scrap remain on the inner wall surface of the cylindrical portion. There is a problem that the surface accuracy of the corner portion having small deformation resistance and the inner surface of the cylindrical shape is deteriorated.

【0005】後者の据込みにより肉厚を増加させる工法
においては、ブランクを回転させながらその外周部を半
径方向内方へ圧縮(据込み)して肉厚を増加させるもので
あるから増肉のための特殊な設備を必要とし、また、こ
の製品の形態ではバーリング加工が先行しているためバ
ーリングの成形高さとか肉厚偏差の問題点は解消されて
いない。
In the latter method of increasing the wall thickness by upsetting, the outer peripheral portion is compressed (upset) radially inward while rotating the blank to increase the wall thickness. In addition, since the burring process is performed in advance in this form of the product, the problems of the molding height and the thickness deviation of the burring have not been solved.

【0006】本発明は以上の課題を解決するためになさ
れたもので、厚板のバーリング加工に際して、バーリン
グ加工用の下穴が成形された素材を据込み、加工後のボ
ス部となる部分に材料を集積させることにより加工時の
ボス部における材料不足を解消し、肉厚偏差が少なく、
成形高さが高く、円筒内側面の面精度が良く、さらに生
産性の優れた厚板の据込み−バーリング加工方法及びそ
の金型の提供を目的とするものである。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when a thick plate is burred, a material having a prepared hole for burring is swaged, and the boss portion after the processing is formed. By accumulating materials, material shortage at the boss during processing is eliminated, thickness deviation is small,
It is an object of the present invention to provide a method of upsetting and burring a thick plate having a high molding height, good surface accuracy on the inner surface of a cylinder, and excellent productivity, and a mold for the method.

【0007】[0007]

【課題を解決するための手段】上記の目的を達成するた
め、請求項1記載の発明は、円板状の厚板素材にバーリ
ング加工の下穴を打ち抜く工程と、前記素材の外周を拘
束しながら据込み加工によってバーリング加工部分の板
厚を増肉させた後にバーリング加工によってボス部を成
形し、次いでボスの端部をスリーブパンチによってサイ
ジング加工してボス部を成形する工程とからなることを
特徴とする厚板の据込み−バーリング加工方法である。
In order to achieve the above object, the invention according to claim 1 comprises a step of punching a pilot hole in a disc-shaped thick plate material by burring, and a step of restraining the outer periphery of the material. While increasing the thickness of the burring portion by upsetting while forming the boss by burring, and then sizing the end of the boss with a sleeve punch to form the boss. This is a method of upsetting and burring a thick plate.

【0008】また、請求項2記載の発明は、下型1の中
心部にバーリングポンチ2を設けると共に該下型1の上
面には素材3の外周方向への流動を拘束する拘束リング
4を載置して設け、一方、上型側としては、前記素材3
の上面を押付ける押えパンチ5を設け、前記押えパンチ
5の内側にはにバーリング加工部分の板厚を増肉させる
ための据込みパンチ6を設けると共に、該据込みパンチ
6の内面にはボスの端部をサイジングするスリーブパン
チ7を設けたことを特徴とする厚板の据込みバーリング
加工金型である。
According to the second aspect of the present invention, a burring punch 2 is provided at the center of the lower mold 1 and a restraining ring 4 for restraining the material 3 from flowing in the outer peripheral direction is mounted on the upper surface of the lower mold 1. On the other hand, as the upper mold side, the material 3
A press punch 5 for pressing the upper surface of the boss is provided, an upset punch 6 for increasing the thickness of the burring portion is provided inside the press punch 5, and a boss is provided on the inner surface of the upset punch 6. And a sleeve punch 7 for sizing the end of the plate.

【0009】また、請求項3記載の発明は、据込みパン
チ6の下面もしくは該据込みパンチ6と対峙する下型1
の上面部には、据込み時の材料流れを促進するためのテ
ーパー角αを設けたことを特徴とする請求項2記載の厚
板の据込み−バーリング加工金型である。
The third aspect of the present invention is directed to the lower die 1 or the lower die 1 facing the upsetting punch 6.
The upsetting and burring die for a thick plate according to claim 2, wherein a taper angle α is provided on an upper surface portion of the upper surface to promote a material flow at the time of upsetting.

【0010】[0010]

【発明の作用】本発明据込み−バーリング加工方法によ
ると、バーリング加工の下穴を打ち抜いた厚板素材の外
周を拘束リングで拘束しながら据込み−バーリング加工
を行うものであるから、素材の外周方向への流動を起こ
すこと無く、半径方向内側即ちバーリング加工部分の板
厚を増肉させることができるため、厚肉で且肉厚偏差が
少ないボス部を成形することができる。
According to the upsetting-burring method of the present invention, the upsetting-burring process is performed while restraining the outer periphery of the thick plate material from which the prepared hole of the burring process is punched by the restraining ring. The thickness of the burring portion can be increased in the radially inner portion, that is, in the burring portion, without causing a flow in the outer peripheral direction, so that a boss portion having a large thickness and a small thickness deviation can be formed.

【0011】[0011]

【発明の実施の形態】図1は、本発明に係る据込み−バ
ーリング加工の金型の断面図であり、(A)は据込み−バ
ーリング加工の状態を示し、(B)はボス部のサイジング
加工の状態を示している。本発明の据込み−バーリング
加工金型は、従来のバーリング加工金型に、据込みパン
チとスリーブパンチを複合させた構造となっている。図
1において、1は下型であり、2は下型1の中心部に設
けられたバーリングポンチである。3は円板状の厚板素
材であり、該素材3の中心部にはバーリング加工の下穴
が空けられている。4は、素材3の外周方向への流動を
拘束する拘束リングであり、該拘束リング4は下型1の
上面に載置されている。
FIG. 1 is a sectional view of a die for upsetting and burring according to the present invention. FIG. 1A shows a state of upsetting and burring, and FIG. The state of the sizing processing is shown. The upsetting-burring die of the present invention has a structure in which an upsetting punch and a sleeve punch are combined with a conventional burring die. In FIG. 1, reference numeral 1 denotes a lower die, and 2 denotes a burring punch provided at the center of the lower die 1. Reference numeral 3 denotes a disc-shaped thick plate material, and a central hole of the material 3 is provided with a burring pilot hole. Reference numeral 4 denotes a restraining ring that restrains the flow of the material 3 in the outer peripheral direction. The restraining ring 4 is placed on the upper surface of the lower mold 1.

【0012】一方、上型側は、前記素材3の上面を押付
ける押えパンチ5と、前記押えパンチ5の内側に設けら
れバーリング加工部分の板厚を増肉させるための据込み
パンチ6と、該据込みパンチ6の内面に設けられたボス
の端部をサイジングするスリーブパンチ7とにより構成
されている。
On the other hand, on the upper die side, a pressing punch 5 for pressing the upper surface of the material 3, an upsetting punch 6 provided inside the pressing punch 5 for increasing the thickness of a burring portion, And a sleeve punch 7 for sizing an end of a boss provided on the inner surface of the upsetting punch 6.

【0013】また、前記の据込みパンチ6と対峙する下
型1の上面部には、据込み時の材料流れを促進するため
のテーパー角α(0.5°〜4.5°)が設けられてい
る。なお、前記の下型に換えて据込みパンチ6の下面に
テーパー角αを設けても同じ作用効果が得られる。
A taper angle α (0.5 ° to 4.5 °) for facilitating material flow during upsetting is provided on the upper surface of the lower mold 1 facing the upsetting punch 6. Have been. The same operation and effect can be obtained by providing a taper angle α on the lower surface of the upsetting punch 6 instead of the lower die.

【0014】[0014]

【実施例】次に、本発明に係る厚板の据込み−バーリン
グ加工方法を図1に基づいて説明する。 (イ)予め、別の工程にて厚板を円板状に打抜くと共に
中心部にバーリング加工の下穴を空けて素材3を製作す
る。 (ロ)次に、下型1の上面に載置された拘束リング4に
素材3をセットし、前記素材3の上面を押えパンチ5に
て押付けながら据込みパンチ6を下降させ、素材の外周
を拘束しながら据込み加工を行いバーリング加工部分の
板厚を増肉させる。(図1−Aの左半断面を参照。) (ハ)次に、バーリングポンチ2を押し上げてバーリン
グ加工を行いボス部を成形する。(図1−Aの右半断面
を参照。) (ニ)次に、スリーブパンチによってサイジング加工を
行い、ボスの端部を成形する。(図1−Bの左半断面は
成形前の状態を示し、右半断面は成形後の状態を示して
いる。)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of upsetting and burring a thick plate according to the present invention will be described with reference to FIG. (B) In a separate step, a blank is punched out in a separate step from a thick plate, and a prepared hole is made in the center of a burring process to manufacture the material 3. (B) Next, the material 3 is set on the restraining ring 4 placed on the upper surface of the lower mold 1, and the upsetting punch 6 is lowered while pressing the upper surface of the material 3 with the holding punch 5, and the outer periphery of the material is Upsetting while restricting the thickness of the burring portion. (See the left half section of FIG. 1-A.) (C) Next, the burring punch 2 is pushed up to perform burring to form a boss portion. (See the right half section in FIG. 1A.) (D) Next, sizing is performed by a sleeve punch to form an end of the boss. (The left half section of FIG. 1-B shows the state before molding, and the right half section shows the state after molding.)

【0015】従来例との比較で説明しますと、図2は、
従来のバーリング加工方法におけるバーリング加工用金
型の断面図である。図2に示すバーリングパンチは、R
=30の砲弾型で、直径Dを26.4mmとした。
被加工材は板厚5mm、直径D=100mmのアル
ミニウム板A1050P−O(引張強さ70MPa)で、
中央にバーリング加工の下穴を設けた。この下穴の直径
は20mmと10mmの2種類とした。潤滑剤はP46
0を用いた。実験には50TONの油圧プレスを用い
た。
FIG. 2 shows a comparison with the conventional example.
It is sectional drawing of the metal mold | die for burring in the conventional burring method. The burring punch shown in FIG.
= 30 bullet-shaped, and a 26.4mm diameter D p.
The material to be processed is an aluminum plate A1050P-O (tensile strength 70 MPa) having a thickness of 5 mm and a diameter D 1 = 100 mm.
A central hole was provided for burring at the center. The diameter of the pilot hole was two types, 20 mm and 10 mm. Lubricant is P46
0 was used. A 50 TON hydraulic press was used for the experiment.

【0016】実験結果は、図3の成形品のボス部断面形
状を説明する図に示されるように、下穴直径D=2
0mmでは、ボス高さが不足しており、ボス部先端の板
厚減少が見られる。Dを10mmと小さくすると、
ボス高さが得られるが、ボス部先端の板厚減少が顕著に
なっている。また、ボス部端面付近にひずみの増大によ
る肌荒れが生じている。このように、従来工法における
厚板のバーリング加工ではボス高さの不足、ボス形状の
不整およびボス端面付近の肌荒れなどの問題点が確認さ
れた。
The experimental results show that the pilot hole diameter D 2 = 2, as shown in FIG.
At 0 mm, the boss height is insufficient, and a decrease in the plate thickness at the tip of the boss portion is observed. When D 2 is reduced to 10 mm,
Although the boss height can be obtained, the thickness of the tip of the boss portion is significantly reduced. In addition, the rough surface due to the increase in strain occurs near the boss end face. As described above, problems such as insufficient boss height, irregular boss shape, and rough skin near the boss end surface were confirmed in the burring of a thick plate by the conventional method.

【0017】図4は、本発明の据込み−バーリング加工
方法における加工工程別の成形品の断面形状を説明する
図である。本発明の工法においては、FEM解析結果に
基づいて据込み量2mm、テーパー角α=2°10′の
金型を製作し、実験を行った。なお、実験条件は、図2
に示すものと同じとし、バーリング加工用下穴径は20
mmとした。
FIG. 4 is a view for explaining the cross-sectional shape of a molded product in each processing step in the upsetting-burring method of the present invention. In the method of the present invention, a mold having an upsetting amount of 2 mm and a taper angle α = 2 ° 10 ′ was manufactured based on the FEM analysis results, and an experiment was performed. The experimental conditions are shown in FIG.
And the pilot hole diameter for burring is 20
mm.

【0018】本発明の据込み−バーリング加工では、図
4に示すように、据込み加工によって下穴周りの板厚が
増大し、バーリング加工時、肉厚偏差が少なくなった。
また、ボス高さも十分得られ、サイジング (整形加工)
によって良好な製品形状が選られた。
In the upsetting-burring process of the present invention, as shown in FIG. 4, the thickness of the hole around the pilot hole was increased by the upsetting process, and the thickness deviation was reduced during the burring process.
In addition, the boss height is sufficiently obtained, and sizing (shaping)
A good product shape was selected.

【0019】[0019]

【発明の効果】本発明据込み−バーリング加工方法によ
ると、バーリング加工の下穴を打ち抜いた厚板素材の外
周を拘束リングで拘束しながら据込み−バーリング加工
を行うものであるから、素材の外周方向への流動を起こ
すことなく、半径方向内側即ちバーリング加工部分の板
厚を増肉させることができるため、厚肉で且肉厚偏差が
少ないボス部を成形することができる。
According to the upsetting-burring method of the present invention, the upsetting-burring process is performed while the outer periphery of the thick plate material from which the prepared hole of the burring process is punched is restrained by the restraining ring. The thickness of the inner portion in the radial direction, that is, the thickness of the burring portion can be increased without causing a flow in the outer peripheral direction, so that a boss portion having a large thickness and a small thickness deviation can be formed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明に係る据込み−バーリング加工の金型
の断面図であり、(A)は据込み−バーリング加工の状態
を示し、(B)はボス部のサイジング加工の状態を示す。
FIG. 1 is a cross-sectional view of a die for upsetting and burring according to the present invention, in which (A) shows a state of upsetting and burring, and (B) shows a state of sizing of a boss portion.

【図2】 従来方法におけるバーリング加工用金型の断
面図。
FIG. 2 is a cross-sectional view of a burring die according to a conventional method.

【図3】 従来方法における成形品のボス部断面形状を
説明する図。
FIG. 3 is a view for explaining a cross-sectional shape of a boss of a molded product in a conventional method.

【図4】 本発明に係る据込み−バーリング加工方法の
工程別の成形品断面形状を説明する図。
FIG. 4 is a view for explaining a cross-sectional shape of a molded product in each step of the upsetting-burring method according to the present invention.

【符号の説明】[Explanation of symbols]

1 下型、 2 バーリン
グポンチ、3 円板状の厚板素材、 4
拘束リング、5 押えパンチ、
6 据込みパンチ、7 スリーブパンチ、 α テーパ
ー角。
1 Lower die, 2 Burring punch, 3 disc-shaped thick plate material, 4
Restraint ring, 5 presser punch,
6 Upset punch, 7 Sleeve punch, α taper angle.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】円板状の厚板素材にバーリング加工の下穴
を打ち抜く工程と、前記素材の外周を拘束しながら据込
み加工によってバーリング加工部分の板厚を増肉させた
後にバーリング加工によってボス部を成形し、次いでボ
スの端部をスリーブパンチによってサイジング加工して
ボス部を成形する工程とからなることを特徴とする厚板
の据込み−バーリング加工方法。
1. A step of punching a pilot hole in a burring process in a disc-shaped thick plate material, and increasing the thickness of a burring portion by upsetting while restraining the outer periphery of the material, and thereafter performing the burring process. Forming a boss portion and then sizing the end portion of the boss by a sleeve punch to form the boss portion.
【請求項2】下型1の中心部にバーリングポンチ2を設
けると共に該下型1の上面には素材3の外周方向への流
動を拘束する拘束リング4を載置して設け、 一方、上型側としては、前記素材3の上面を押付ける押
えパンチ5を設け、前記押えパンチ5の内側にはにバー
リング加工部分の板厚を増肉させるための据込みパンチ
6を設けると共に、該据込みパンチ6の内面にはボスの
端部をサイジングするスリーブパンチ7を設けたことを
特徴とする厚板の据込み−バーリング加工金型。
2. A burring punch 2 is provided at the center of the lower mold 1, and a restraining ring 4 for restraining the flow of the material 3 in the outer peripheral direction is mounted and provided on the upper surface of the lower mold 1. On the mold side, a presser punch 5 for pressing the upper surface of the material 3 is provided. Inside the presser punch 5, an upsetting punch 6 for increasing the thickness of the burring portion is provided. A swaging-burring die for a thick plate, wherein a sleeve punch 7 for sizing an end of a boss is provided on an inner surface of the punch 6.
【請求項3】据込みパンチ6の下面もしくは該据込みパ
ンチ6と対峙する下型1の上面部には、据込み時の材料
流れを促進するためのテーパー角αを設けたことを特徴
とする請求項2記載の厚板の据込み−バーリング加工金
型。
3. A taper angle α for facilitating material flow during upsetting is provided on the lower surface of the upsetting punch 6 or on the upper surface of the lower die 1 facing the upsetting punch 6. The upsetting and burring die for a thick plate according to claim 2.
JP2001155893A 2001-05-24 2001-05-24 Method for upset burring of thick plate and its mold Pending JP2002346682A (en)

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JP2012215224A (en) * 2011-03-31 2012-11-08 Hitachi Automotive Systems Ltd Cylinder member and manufacturing method therefor
CN108405774A (en) * 2018-05-14 2018-08-17 四川长虹空调有限公司 Metal plate thin material connection flange hole forming method and flanging bore semi-finished product structure
JP2021053643A (en) * 2019-09-26 2021-04-08 ダイハツ工業株式会社 Method for manufacturing component
CN112916783A (en) * 2021-02-07 2021-06-08 哈尔滨工业大学 Plate forging forming die device with local hole thickening characteristic and technological method
CN112916782A (en) * 2021-02-07 2021-06-08 哈尔滨工业大学 Local progressive loading precision forming die and method for ultra-long thin web high-rib complex component with local abrupt change characteristics

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6789576B2 (en) * 2000-05-30 2004-09-14 Nhk Spring Co., Ltd Accumulator
JP2007326455A (en) * 2006-06-07 2007-12-20 Takata Corp Seat belt position adjusting device and seat belt device equipped therewith
JP2012215224A (en) * 2011-03-31 2012-11-08 Hitachi Automotive Systems Ltd Cylinder member and manufacturing method therefor
CN108405774A (en) * 2018-05-14 2018-08-17 四川长虹空调有限公司 Metal plate thin material connection flange hole forming method and flanging bore semi-finished product structure
JP2021053643A (en) * 2019-09-26 2021-04-08 ダイハツ工業株式会社 Method for manufacturing component
JP7348790B2 (en) 2019-09-26 2023-09-21 ダイハツ工業株式会社 Part manufacturing method
CN112916783A (en) * 2021-02-07 2021-06-08 哈尔滨工业大学 Plate forging forming die device with local hole thickening characteristic and technological method
CN112916782A (en) * 2021-02-07 2021-06-08 哈尔滨工业大学 Local progressive loading precision forming die and method for ultra-long thin web high-rib complex component with local abrupt change characteristics

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