JP3545436B2 - Manufacturing method of washers with built-in washers - Google Patents

Manufacturing method of washers with built-in washers Download PDF

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Publication number
JP3545436B2
JP3545436B2 JP12356693A JP12356693A JP3545436B2 JP 3545436 B2 JP3545436 B2 JP 3545436B2 JP 12356693 A JP12356693 A JP 12356693A JP 12356693 A JP12356693 A JP 12356693A JP 3545436 B2 JP3545436 B2 JP 3545436B2
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JP
Japan
Prior art keywords
washer
bolt
outer diameter
tightened
shaft
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.)
Expired - Lifetime
Application number
JP12356693A
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Japanese (ja)
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JPH06313419A (en
Inventor
一真 砂川
秀偉 桜木
禎治 平田
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Nissan Motor Co Ltd
Topura Co Ltd
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Nissan Motor Co Ltd
Topura Co Ltd
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Filing date
Publication date
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Priority to JP12356693A priority Critical patent/JP3545436B2/en
Publication of JPH06313419A publication Critical patent/JPH06313419A/en
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Description

【０００１】
【産業上の利用分野】
本発明は、軸部に座金を組み込んだ座金組込ボルトの製造方法に関するものである。
【０００２】
【従来の技術】
ボルトによる締結構造について説明する。図４（Ａ）は、一般に用いられるボルトである。図中、１は頭部、２は軸部、３はねじ部である。このボルトは、軸部の外径を有する線材を用意し、圧造によって頭部１を形成した後、転造によってねじ部３を形成する。頭部１とねじ部３との間が軸部２となる。ねじ部３の外径は、転造によって盛り上がるから、軸部２の外径より大きい。
【０００３】
このボルトによる締め付け構造は、ボルトを通すために被締付材に開けられるボルト穴の穴径は、ねじ部３の外径より大きくなければならないことは当然である。軸部２の外径は、ねじ部３の外径より小さいから、軸部２とボルト穴との間隙は、大きくなる。したがって、このようなボルトによる締結構造においては、被締付部材に外力が働いて、被締付材が横滑りしようとすると、上述した間隙の分だけの横滑りを避けることはできない。
【０００４】
図４（Ｂ）に示すように、軸部２の外径が、ねじ部３の外径より大きいボルトを用いた場合には、ボルトを通すために被締付材に開けられる穴径は、軸部２の外径より僅かに大きければよい。そうすると、被締付材の穴とボルトの軸部２との間隙は僅少となる。そうすると、このボルトによる締結構造においては、被締付部材に外力が働いて、被締付材が横滑りしようとしても、軸部２によって、被締付材の横滑りを防止することができる。
【０００５】
図４（Ｂ）で説明したボルトは、例えば、自動車部品をボルトによって締結する締結構造に用いられ、被締付部材に外力が働いた場合、ボルトの軸部で、被締付材の横滑り等を防止している。このような締結構造においては、ボルトの緩みを防止するために、座金を用いることが普通である。
【０００６】
座金を用いる場合には、ボルトを使用する工程において、ボルトに座金を挿入する作業が必要となる。座金を組み込んだ座金組込ボルトを使用すると、座金をボルトに挿入する作業が不必要である。
【０００７】
従来の座金組込ボルトは、ストレートのねじブランクに座金を入れ、転造で成形されたねじ山により座金の脱落を防止している。
【０００８】
また、特開平４−１４５２１０号公報に記載されているように、ねじ山の転造時に、座金の脱落防止用のセレーションを入れ、その後に、座金を圧入する方法も知られている。転造によるセレーションの場合は、軸部のセレーションは、被締付材の穴に対して線接触となるため、被締付材と接触する面積が小さく、負荷を受けた場合に、セレーションの山が潰れてしまい、横滑りが避けられないという問題がある。
【０００９】
図４（Ｂ）で説明したボルトの場合には、軸部２の外径が、ねじ部３の外径より大きいから、転造で成形されたねじ山によって座金の脱落を防止する方法は採用できない。座金を接着剤で固定しておく方法もあるが、接着のための工程が必要であり、コスト高となる。また、運搬途中等において、座金が外れたりすることがあるという問題もある。
【００１０】
【発明が解決しようとする課題】
本発明は、上述した問題点を解決するためになされたもので、軸部の外径がねじ部の外径より大きいボルトにおいて、座金の脱落が防止できるとともに、座金組込ボルトを用いて被締付部材を締め付けた場合に該被締付部材に働く外力による該被締付部材の横滑りを防止できる座金組込ボルトの製造方法を提供することを目的とするものである。
【００１１】
【課題を解決するための手段】
本発明は、ねじ部の外径より大きい軸部を有するボルトの軸部に座金を挿入した後、金型に挿入して、ボルトの頭部より荷重を加えることにより、軸部の下部に前記座金の内径より大きい外径を有するリング状の隆起部を形成する座金組込ボルトの製造方法において、前記金型は、軸部が挿入される部分に形成された座金内径より大きい所定の拘束径を有する円筒部と、該円筒部の底部に形成されたねじ部の外径より大きく軸部の外径より小さい剪断部を有し、ボルトの頭部より加える前記荷重は、前記隆起部が、所定の軸方向長さとなるとともに、周面が円柱面形状に形成されるように加え、それにより前記座金組込ボルトを用いて被締付部材を締め付けた場合に該被締付部材に働く外力による該被締付部材の横滑りを防止できる座金組込ボルトを製造することを特徴とするものである。
【００１３】
【作用】
本発明によれば、座金が挿入された軸部の下部にリング状の隆起部が形成されていることにより座金が脱落することがなく、また、被締付材に隆起部に応じた穴を開けることによって、ボルトと穴との間隙を小さくでき、座金組込ボルトを用いて被締付部材を締め付けた場合に該被締付部材に働く外力による該被締付部材の横滑りを防止できる座金組込ボルトを製造できる。
【００１４】
軸部における隆起部の形成は、軸部が挿入される部分に形成された座金内径より大きい所定の拘束径を有する円筒部と、該円筒部の底部に形成されたねじ部の外径より大きく軸部の外径より小さい剪断部を有する金型にボルトを挿入し、ボルトの頭部より荷重を加えることによって行なうため、精度のよい隆起部が容易に形成できる。
【００１５】
【実施例】
図１は、本発明の座金組込ボルトの一実施例の概略構成図である。図中、１は頭部、２は軸部、３はねじ部、４は隆起部、５はバネ座金、６は平座金である。軸部２の外径は、ねじ部３の外径より大きく、座金の内径より若干小さい。軸部２の下部には、隆起部４が形成されている。隆起部４の外径に相当した穴を被締付材に開けることにより、上述したように、被締付材の外力に対する横滑りを防止できる。頭部１と隆起部４との間に、バネ座金５と平座金６が挿入されている。平座金６の穴の内径よりも隆起部４の外径が大きいことにより、平座金６の脱落を防止できる。バネ座金５は、平座金６によって、脱落することはない。なお、この実施例では、座金とし、バネ座金と平座金を用いたが、これに限らず、適宜の数の適宜の座金を用いることができる。
【００１６】
図２，図３は、図１の実施例の座金組込ボルトの製造方法の説明図である。図中、図１と同様な部分には同じ符号を付して説明を省略する。７はプレス金型、８は剪断部である。図２に、各部の側面図を示す。図２（Ａ）のボルトは、頭部１と軸部２が圧造により成形されたものである。ねじ部３は転造により形成されたものである。ねじ部の外径をａ、軸部の外径をｂとする。図２（Ｂ）は、座金の側面図であり、上述したように、バネ座金５と平座金６である。平座金６の穴の内径をｃとする。図２（Ｃ）はプレス金型７を示す。プレス金型７は、剪断部を形成する穴径ｄと隆起部の外径を規制するための金型拘束径ｅを有している。
【００１７】
各部の寸法関係は、
ｅ＞ｃ＞ｂ
であり、
ｄ＞ａ
である。
【００１８】
図２（Ａ）のボルトの軸部２に、図２（Ｂ）のバネ座金５、平座金６を挿入し、図２（Ｃ）のプレス金型７に挿入する。
【００１９】
図３（Ａ）は、挿入状態における要部の拡大図である。プレス金型７の剪断部８に軸部２がかかる状態となる。この状態で頭部１の上から荷重をかけてプレスする。図３（Ｂ）に示すように、軸部２が下方からプレス金型７の剪断部８で絞られて、上方に隆起部４ができる。隆起部４は、図２（Ｃ）で説明した金型拘束径ｅによって、その外径が規制される。隆起部４の軸方向の長さは、一例では、隆起部４の外径を１６ｍｍとした場合に、１．５ｍｍ以上あれば、１５００ｋｇの外力に対して変形はみられなかった。
【００２０】
【発明の効果】
以上の説明から明らかなように、本発明の座金組込ボルトによれば、座金が脱落することがなく、また、被締付材に隆起部に応じた穴を開けることによって、ボルトと穴との間隙を小さくでき、被締付材の外力に対する横滑りを防止することができる。
【００２１】
また、軸部における隆起部の形成は、ねじ部の外径より大きく軸部の外径より小さい剪断部を有し座金内径より大きい拘束径を有する金型に挿入し、ボルトの頭部より荷重を加えることによって行なうため、精度のよい隆起部が容易に形成できるという効果がある。
【図面の簡単な説明】
【図１】本発明の座金組込ボルトの一実施例の概略構成図である。
【図２】図１の実施例の座金組込ボルトの製造方法の説明図である。
【図３】図１の実施例の座金組込ボルトの製造方法の説明図である。
【図４】ボルトによる締結構造を説明するためのボルトの側面図である。
【符号の説明】
１ 頭部
２ 軸部
３ ねじ部
４ 隆起部
５ バネ座金
６ 平座金
７ プレス金型
８ 剪断部[0001]
[Industrial applications]
The present invention relates to a method for manufacturing a washer-incorporated bolt in which a washer is incorporated in a shaft portion.
[0002]
[Prior art]
The fastening structure using bolts will be described. FIG. 4A shows a commonly used bolt. In the figure, 1 is a head, 2 is a shaft, and 3 is a screw. This bolt is prepared by preparing a wire having an outer diameter of a shaft portion, forming the head portion 1 by forging, and then forming the screw portion 3 by rolling. The shaft 2 is located between the head 1 and the screw 3. The outer diameter of the screw portion 3 is larger than the outer diameter of the shaft portion 2 because it is raised by rolling.
[0003]
In the tightening structure using this bolt, it is natural that the diameter of the bolt hole formed in the material to be tightened in order to pass the bolt must be larger than the outer diameter of the screw portion 3. Since the outer diameter of the shaft portion 2 is smaller than the outer diameter of the screw portion 3, the gap between the shaft portion 2 and the bolt hole becomes larger. Therefore, in such a fastening structure using bolts, if an external force acts on the member to be tightened and the member to be tightened tries to skid, the above-mentioned skid cannot be avoided only by the gap.
[0004]
As shown in FIG. 4 (B), when a bolt having an outer diameter of the shaft portion 2 larger than the outer diameter of the screw portion 3 is used, a hole diameter formed in the material to be tightened to pass the bolt is: What is necessary is just to be slightly larger than the outer diameter of the shaft part 2. Then, the gap between the hole of the material to be tightened and the shaft portion 2 of the bolt becomes small. Then, in the fastening structure using the bolt, even when an external force acts on the member to be tightened and the material to be tightened tries to slide, the shaft portion 2 can prevent the material to be tightened from skidding.
[0005]
The bolt described with reference to FIG. 4B is used, for example, in a fastening structure for fastening an automobile part with a bolt, and when an external force acts on a member to be tightened, a side of the member to be tightened slides on a shaft portion of the bolt. Has been prevented. In such a fastening structure, it is usual to use a washer to prevent the bolt from being loosened.
[0006]
In the case of using the washer, an operation of inserting the washer into the bolt is required in the step of using the bolt. When a washer-incorporated bolt incorporating a washer is used, the work of inserting the washer into the bolt is unnecessary.
[0007]
In a conventional washer-incorporated bolt, a washer is inserted into a straight screw blank, and the washer is prevented from falling off by a thread formed by rolling.
[0008]
Further, as described in Japanese Patent Application Laid-Open No. 4-145210, a method is also known in which serrations for preventing falling off of washers are provided at the time of thread rolling, and then the washers are press-fitted. In the case of serration by rolling, the serration of the shaft part is in line contact with the hole of the material to be tightened, so the area in contact with the material to be tightened is small. Is crushed, and there is a problem that sideslip cannot be avoided.
[0009]
In the case of the bolt described with reference to FIG. 4B, since the outer diameter of the shaft portion 2 is larger than the outer diameter of the screw portion 3, a method of preventing the washer from falling off by a thread formed by rolling is adopted. Can not. Although there is a method in which the washer is fixed with an adhesive, a step for bonding is required, which increases the cost. There is also a problem that the washer may come off during transportation or the like.
[0010]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and in a bolt having an outer diameter of a shaft portion larger than an outer diameter of a screw portion, it is possible to prevent a washer from falling off and to use a washer-integrated bolt to cover the washer. An object of the present invention is to provide a method of manufacturing a washer-incorporated bolt that can prevent a side-slip of the member to be tightened due to an external force acting on the member to be tightened when the member is tightened.
[0011]
[Means for Solving the Problems]
The present invention relates to a method of manufacturing a semiconductor device, comprising: inserting a washer into a shaft of a bolt having a shaft larger than the outer diameter of the screw, inserting the washer into a mold, and applying a load from the head of the bolt, so that the lower part of the shaft is In the method for manufacturing a washer-incorporated bolt forming a ring-shaped raised portion having an outer diameter larger than the inner diameter of the washer, the die has a predetermined constraint diameter larger than the inner diameter of the washer formed at a portion where the shaft is inserted. A cylindrical portion having a shear portion larger than the outer diameter of the screw portion formed at the bottom of the cylindrical portion and smaller than the outer diameter of the shaft portion, the load applied from the head of the bolt, An external force acting on the member to be tightened when the member to be tightened is tightened by using the washer-incorporated bolts so as to have a predetermined axial length and to form the peripheral surface into a cylindrical shape. Incorporation of a washer that can prevent the tightened member from skidding due to It is characterized in that to produce the belt.
[0013]
[Action]
According to the present invention, since the ring-shaped raised portion is formed at the lower portion of the shaft portion into which the washer is inserted, the washer does not fall off, and a hole corresponding to the raised portion is formed in the material to be tightened. By opening the washer, the gap between the bolt and the hole can be reduced, and when the member to be tightened is tightened by using a washer-incorporated bolt, a side slip of the member to be tightened due to an external force acting on the member to be tightened can be prevented. Can be used to manufacture mounting bolts.
[0014]
The formation of the protruding portion in the shaft portion has a cylindrical portion having a predetermined restraining diameter larger than the inner diameter of the washer formed in the portion where the shaft portion is inserted, and a larger diameter than the outer diameter of the screw portion formed in the bottom of the cylindrical portion. Since the bolt is inserted into a mold having a shearing portion smaller than the outer diameter of the shaft portion and a load is applied from the head of the bolt, a highly accurate raised portion can be easily formed.
[0015]
【Example】
FIG. 1 is a schematic configuration diagram of an embodiment of a washer-incorporated bolt of the present invention. In the figure, 1 is a head, 2 is a shaft portion, 3 is a screw portion, 4 is a raised portion, 5 is a spring washer, and 6 is a flat washer. The outer diameter of the shaft portion 2 is larger than the outer diameter of the screw portion 3 and slightly smaller than the inner diameter of the washer. A raised portion 4 is formed below the shaft portion 2. By forming a hole corresponding to the outer diameter of the raised portion 4 in the material to be tightened, it is possible to prevent the material to be tightened from slipping against external force as described above. A spring washer 5 and a flat washer 6 are inserted between the head 1 and the raised portion 4. Since the outer diameter of the raised portion 4 is larger than the inner diameter of the hole of the flat washer 6, the falling off of the flat washer 6 can be prevented. The spring washer 5 does not fall off due to the flat washer 6. In this embodiment, spring washers and flat washers are used as washers. However, the present invention is not limited to this, and an appropriate number of appropriate washers can be used.
[0016]
2 and 3 are explanatory diagrams of a method of manufacturing the washer-incorporated bolt of the embodiment in FIG. In the figure, the same parts as those in FIG. 7 is a press die, 8 is a shearing part. FIG. 2 shows a side view of each part. The bolt in FIG. 2A has a head 1 and a shaft 2 formed by forging. The screw portion 3 is formed by rolling. The outside diameter of the screw portion is a, and the outside diameter of the shaft portion is b. FIG. 2B is a side view of the washer, and includes the spring washer 5 and the flat washer 6 as described above. The inner diameter of the hole of the flat washer 6 is denoted by c. FIG. 2C shows the press die 7. The press die 7 has a hole diameter d for forming a shear portion and a die constraint diameter e for regulating the outer diameter of the raised portion.
[0017]
The dimensional relationship of each part is
e>c> b
And
d> a
It is.
[0018]
The spring washer 5 and the flat washer 6 of FIG. 2 (B) are inserted into the shaft 2 of the bolt of FIG. 2 (A), and are inserted into the press die 7 of FIG. 2 (C).
[0019]
FIG. 3A is an enlarged view of a main part in an inserted state. The shaft portion 2 is put on the shearing portion 8 of the press die 7. In this state, a load is applied from above the head 1 under a load. As shown in FIG. 3 (B), the shaft portion 2 is squeezed from below by the shearing portion 8 of the press die 7 to form a raised portion 4 above. The outer diameter of the raised portion 4 is regulated by the mold constraint diameter e described with reference to FIG. In one example, when the outer diameter of the raised portion 4 was 16 mm and the outer length of the raised portion 4 was 1.5 mm or more, no deformation was observed for an external force of 1500 kg.
[0020]
【The invention's effect】
As is clear from the above description, according to the washer-integrated bolt of the present invention, the washer does not fall off, and the bolt and the hole are formed by forming a hole in the material to be tightened according to the raised portion. Can be reduced, and the side-slip of the material to be tightened against external force can be prevented.
[0021]
In addition, the formation of the raised portion in the shaft portion is performed by inserting the protrusion into a mold having a shearing portion larger than the outer diameter of the screw portion and smaller than the outer diameter of the shaft portion and having a constraint diameter larger than the inner diameter of the washer, and Therefore, there is an effect that a highly accurate raised portion can be easily formed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment of a washer-incorporated bolt of the present invention.
FIG. 2 is an explanatory view of a method of manufacturing the washer-incorporated bolt of the embodiment of FIG.
FIG. 3 is an explanatory view of a method of manufacturing the washer-incorporated bolt of the embodiment of FIG.
FIG. 4 is a side view of the bolt for explaining a fastening structure using the bolt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head part 2 Shaft part 3 Screw part 4 Projection part 5 Spring washer 6 Flat washer 7 Press die 8 Shearing part

Claims (1)

ねじ部の外径より大きい軸部を有するボルトの軸部に座金を挿入した後、金型に挿入して、ボルトの頭部より荷重を加えることにより、軸部の下部に前記座金の内径より大きい外径を有するリング状の隆起部を形成する座金組込ボルトの製造方法において、前記金型は、軸部が挿入される部分に形成された座金内径より大きい所定の拘束径を有する円筒部と、該円筒部の底部に形成されたねじ部の外径より大きく軸部の外径より小さい剪断部を有し、ボルトの頭部より加える前記荷重は、前記隆起部が、所定の軸方向長さとなるとともに、周面が円柱面形状に形成されるように加え、それにより前記座金組込ボルトを用いて被締付部材を締め付けた場合に該被締付部材に働く外力による該被締付部材の横滑りを防止できる座金組込ボルトを製造することを特徴とする座金組込ボルトの製造方法。After inserting a washer into the shaft of a bolt having a shaft that is larger than the outer diameter of the screw, insert it into a mold and apply a load from the head of the bolt to lower the shaft from the inner diameter of the washer. In the method of manufacturing a washer-incorporated bolt forming a ring-shaped raised portion having a large outer diameter, the die includes a cylindrical portion having a predetermined constraint diameter larger than an inner diameter of a washer formed at a portion where a shaft portion is inserted. And a shear portion that is larger than the outer diameter of the screw portion formed at the bottom of the cylindrical portion and smaller than the outer diameter of the shaft portion, and the load applied from the head of the bolt is such that the raised portion has a predetermined axial direction. In addition to the length, the peripheral surface is formed in a cylindrical shape, whereby the tightened member is tightened by an external force acting on the member when the member is tightened using the washer-integrated bolt. Made washer-incorporated bolts that can prevent sideslip of attached members Method of manufacturing Washer bolt, characterized by.
JP12356693A 1993-04-27 1993-04-27 Manufacturing method of washers with built-in washers Expired - Lifetime JP3545436B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12356693A JP3545436B2 (en) 1993-04-27 1993-04-27 Manufacturing method of washers with built-in washers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12356693A JP3545436B2 (en) 1993-04-27 1993-04-27 Manufacturing method of washers with built-in washers

Publications (2)

Publication Number Publication Date
JPH06313419A JPH06313419A (en) 1994-11-08
JP3545436B2 true JP3545436B2 (en) 2004-07-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9194633B2 (en) 2013-03-15 2015-11-24 Bp Corporation North America Inc. Bolt with integrated gasket

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19916989A1 (en) * 1999-04-15 2000-10-19 Bauer Christian Gmbh & Co Locking washer for bolt has inwardly-projecting tongues which cooperate with circumferential groove on bolt
JP2007046779A (en) * 2005-07-14 2007-02-22 Union Seimitsu:Kk Assembly which is easily disassembled and fastened, structure which is easily disassembled and fastened, male screw for easy disassembling and fastening, male screw with washer for easy disassembling and fastening, and manufacturing method therefor
KR20130134047A (en) * 2012-05-30 2013-12-10 이순근 Step height screw combined with washer and device and method thereof

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Publication number Priority date Publication date Assignee Title
JPS5225585Y2 (en) * 1972-07-28 1977-06-10
JPS5224188B1 (en) * 1973-12-06 1977-06-29 Anzai Manufacture Co Ltd Fastener with captive washer
JPS5255580Y2 (en) * 1974-06-20 1977-12-15
JPS5268768U (en) * 1975-11-18 1977-05-21
JPS5753111U (en) * 1980-09-12 1982-03-27
JPS5779218U (en) * 1980-10-30 1982-05-15
JPS5975911U (en) * 1982-11-16 1984-05-23 株式会社三之橋製作所 Bolt to prevent washers from falling off
JPS6252213A (en) * 1985-08-30 1987-03-06 山口　貞造 Device of bolt with washer
JPH0214818U (en) * 1988-07-12 1990-01-30
JPH081208B2 (en) * 1990-02-21 1996-01-10 三菱電機株式会社 Stepped screw
JPH04145210A (en) * 1990-12-15 1992-05-19 Aoyama Seisakusho:Kk Manufacture of bolt with built-in washer
JPH0630520U (en) * 1992-09-04 1994-04-22 株式会社佐賀鉄工所 Bolt with washer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9194633B2 (en) 2013-03-15 2015-11-24 Bp Corporation North America Inc. Bolt with integrated gasket

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