JP2004261861A - Method of manufacturing cap nut - Google Patents

Method of manufacturing cap nut Download PDF

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Publication number
JP2004261861A
JP2004261861A JP2003102229A JP2003102229A JP2004261861A JP 2004261861 A JP2004261861 A JP 2004261861A JP 2003102229 A JP2003102229 A JP 2003102229A JP 2003102229 A JP2003102229 A JP 2003102229A JP 2004261861 A JP2004261861 A JP 2004261861A
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JP
Japan
Prior art keywords
hole
nut body
punch
bag head
curved
Prior art date
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Granted
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JP2003102229A
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Japanese (ja)
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JP4605517B2 (en
Inventor
Yoshiichi Sakamura
芳一 阪村
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Sakamura Machinery Co Ltd
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Sakamura Machinery Co Ltd
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Priority to JP2003102229A priority Critical patent/JP4605517B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing cap nuts which can simply and exactly form bag heads having diverse shapes and can manufacture well-shaped cap nuts of which bag head portion is free from flaws due to shaving or cutting. <P>SOLUTION: First, a nut element assembly 1 comprising a nut body 2 and a hollow cylindrical portion 3 integratedly formed on the head side of the nut body 2 is driven by a punch 6 into a mold 5 having a curved recess 5a in its inward. The edge of the hollow cylindrical portion 3 is curved along the curved recess 5a in the inward of the mold 5 so that the bag head portion 4 is formed, with a hole 4a remaining on the top. Then the inner face of the top of the bag head portion 4 is supported by a supporting punch 9 having a curved convex portion 9a on its edge, and in a state that the hole 4a of the bag head portion 4 is beforehand heated near to the melting temperature, the hole 4a of the bag head portion 4 is pressured on its outer surface by a pressuring punch 10 having a curved recess 10a, whereby the hole 4a is hermetically deposited. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、袋ナットの製造方法に関する。
【０００２】
【従来の技術】
従来、袋ナットの製造方法としては、例えばナット本体と、そのナット本体の頭部側に一体形成された中空円筒部とからなるナット部材を成形し、ナット本体のねじ下孔にねじ立てを施した後、ナット部材を高速回転せしめ、中空円筒部と逆方向に高速回転する複数のローラーを中空円筒部に外側から圧接させて、中空円筒部の先端部を袋状に変形させながらその頂部を溶着せしめて袋頭部を成形し、その後、袋頭部の溶着頂部に発生するバリを削り取るようにしたものが知られている（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開昭５７−１６０５８６号公報 （第１頁、第３図）
【０００４】
【発明が解決しようとする課題】
ところが、上記した従来の袋ナットの製造方法にあっては、複数のローラーによる袋頭部の成形時において中空円筒部の前端部、つまり袋部の頂部に重なった部分（バリ）が発生する。そのため、その重なった部分を削りとる工程が後工程として特別に必要であり、その上、その削り取られた部分が切断傷として残り、外観が悪くなる問題を有していた。しかも、複数のローラーの外側からの圧接のみによる袋頭部の成形ではその成形に限度があり、多様な形状の袋頭部を正確に成形することが困難であった。
【０００５】
そこで、本発明は、多様な形状の袋頭部を簡単かつ正確に成形できると共に、袋頭部に切削傷や切断傷の残らない美しい袋ナットを製造できる袋ナットの製造方法の提供を課題とする。
【０００６】
【課題を解決するための手段】
上記した課題を解決するために、本願の請求項１に記載の発明は、まず、ナット本体と、そのナット本体の頭部側に一体形成された中空円筒部とからなるナット素体を、奥部に湾曲状凹部を有する金型内にパンチにより打ち込んで、中空円筒部の先端を金型内の奥部の湾曲状凹部に沿うように湾曲させて頂部に穴部が残った袋頭部を成形し、次いで、袋頭部の頂部内面を先端に湾曲状凸部を有する受けポンチにて支持し、かつ、袋頭部の穴部部分を予め溶融温度近くまで加熱した状態のもとで、湾曲状凹部を備えた加圧パンチにて袋頭部の穴部部分を外側から加圧することにより穴部を密閉溶着するようにしたことを特徴とする。
【０００７】
また、本願の請求項２に記載の発明は、まず、ナット本体と、そのナット本体の頭部側に一体形成された中空円筒部とからなるナット素体を、奥部に湾曲状凹部を有する金型内にパンチにより打ち込んで、中空円筒部の先端を金型内の奥部の湾曲状凹部に沿うように湾曲させて頂部に穴部が残った袋頭部を成形し、次いで、袋頭部内面を先端に湾曲状凸部を有する受けポンチにて支持し、その支持状態のもとで湾曲状凹部を備えた回転かしめパンチをナット素体と同軸状に回転させながら袋頭部の穴部部分を外側から叩きかしめて穴部を閉塞するようにしたことを特徴とする。
【０００８】
また、本願の請求項３に記載の発明は、袋頭部の穴部部分を加熱手段により予め溶融温度近くまで加熱した状態のもとで、回転かしめパンチにて袋頭部の穴部を閉塞するようにしたことを特徴とする。
【０００９】
さらに、本願の請求項４に記載の発明は、請求項１又は請求項２に記載の製造方法において、ナット素体が、ねじ孔を有するナット本体と、そのナット本体の頭部側に一体に連設され、かつねじ孔の谷径よりも大径の内孔を有する中空円筒部とを備えていることを特徴とする。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
まず、図１に示すように、ねじ下孔２ａを有するナット本体２と、そのナット本体２の頭部側に一体形成されたねじ下孔２ａよりも大径でナット本体２よりも肉薄の中空円筒部３とからなるナット素体１を圧造成形又は切削などの適宜手段により形成する。その後、図２に示すようにナット素体１におけるナット本体２のねじ下孔２ａにねじ孔２ｂのねじ立を施す。なお、ナット素体１の形成するに際し、貫通孔を有する中空素材（所定長さの中空切断ブランク）を圧造成形機（図示せず）により圧造成形するようにすれば、簡単迅速に多量のナット素材１を形成できるので好ましい。
【００１１】
次いで、図３に示すように、ナット素体１を奥部に湾曲状の凹所５ａを有する金型５内にパンチ６により打ち込んで、中空円筒部３の先端を金型５内の湾曲状凹部４ａに沿うように湾曲させて頂部に穴部４ａが残った袋頭部４を成形する。なお、図３において符号７は成形後ナット素体１を金型４外に押出すノックアウトピンである。
【００１２】
その後、袋頭部４の穴部４ａ部分をヒーターなどの加熱手段（図示せず）により予め溶融温度近くまで加熱し、然る後、図４に示すように、ナット素体１の底面を押出部材兼支持部材８で支持すると共に、袋頭部４の頂部側内面を先端に湾曲状の凸部９ａを有する受けポンチ９にて支持する。その上で湾曲状凹部１０ａを有する加圧パンチ１０にてナット素体１における袋頭部４の穴部４ａ部分を外側から加圧する。この加圧により穴部４ａを密閉溶着し、図５に示すような最終製品としての袋ナットＮを形成する。なお、図４、図５において符号１１はベース部材である。
【００１３】
以上の袋ナットの製造方法によれば、袋頭部４の穴部４ａ部分を予め溶融温度近くまで加熱した状態のもとで加圧することにより袋頭部４の穴部４ａを確実に密閉溶着することができ、袋頭部４の側部は勿論その頂部においても切削傷や切断傷などの残らない美しい袋ナットＮを製造することができる。しかも、受けポンチ９の湾曲状凸部９ａと加圧パンチ１０の湾曲状凹部１０ａとで挟み込んで袋頭部の頂部部分を所定形状に成形しながら密閉溶着するから、袋頭部４の頂部部分を所望する形状の通りに、つまり加圧パンチ１０の湾曲状凹部１０ａの形状通りに正確にかつ容易に形成することができる。その上、予めナット素体１の袋頭部４部分をヒータなどの適宜加熱手段により加熱して熱間又は温間のもとで密閉溶着するようにしているので、穴部４ａの密閉溶着を迅速かつ容易に行なうことができる。
【００１４】
また、加圧パンチ１０の内面に商標やサイズ、ナンバー等の圧印凹凸部を設けておけば、加圧パンチ１０による穴部４ａの密閉溶着時に同時に袋ナットの袋頭部に商標やサイズ、ナンバー等の圧印を施すことができ、使用時の判別、宣伝等に効果がある。
【００１５】
また、図６及び図７は別の実施の形態を示すもので、加圧パンチ１０により袋頭部４に残る穴部４ａを密閉溶着するものに代えて、その穴部４ａを回転かしめパンチによる回転叩きかしめ工法により閉塞するようにしたものである。
【００１６】
その場合、まず、先の実施の形態の場合と同様の製造工程により、図１のナット素体１から図２のナット素体１を形成し、次いで、図３に示す頂部に穴部４ａが残った袋頭部４を有するナット素体１を形成する。ここで、ナット素体１の素材としては、アルミ、銅等の軟らかい部材を用いている。
【００１７】
その後、図６に示すように、ナット素体１の底面を押出部材兼支持部材１２で支持すると共に、袋頭部４の頂部側内面を先端に湾曲状の凸部１３ａを有する受けポンチ１３にて支持する。その上で湾曲状凹部１４ａを有する回転かしめパンチ１４をナット素体１と同軸状に回転させながら袋頭部４の穴部４ａ部分を外側から叩きかしめて図７に示すように穴部４ａを閉塞し、最終製品としての袋ナットＮ′を形成するようにしたものである。なお、図６、図７において符号１５はベース部材である。
【００１８】
斯かる袋ナットの製造方法によっても、袋頭部４の穴部４ａを回転かしめパンチ１４にて回転しながら叩きかしめることにより確実に閉塞でき、袋頭部４の側部は勿論その頂部においても切削傷や切断傷などの残らない美しい袋ナットＮ′を製造することができる。しかも、受けポンチ１３の湾曲状凸部１３ａと回転かしめパンチ１４の湾曲状凹部１４ａとで挟み込みながら袋頭部の頂部部分を叩きかしめて所定形状に成形しながら閉塞するから、袋頭部の頂部部分を所望する形状の通りに、つまり、受けポンチ１３の湾曲状凸部１３ａの形状通りに正確にかつ容易に形成することができる。
【００１９】
回転かしめパンチ１４により袋頭部４の穴部４ａを叩きかしめにより閉塞する際、上述した実施の形態のようにナット素体１の素材がアルミ、銅等の軟らかい部材の場合には冷間のもとで閉塞するようにしてもよいが、素材によっては予めナット素体１の袋頭部４部分を適宜加熱手段により加熱して熱間又は温間のもとで回転叩きかしめ閉塞するようにしてもよい。斯かる加熱手段を用いれば、穴部の閉塞をより迅速かつ容易に行なえるので好ましい。
【００２０】
なお、ナット素体１の素材としては、金属素材に限らず、樹脂素材などであってもよい。
【００２１】
【発明の効果】
以上のように本発明の袋ナットの製造方法によれば、未成形として残る袋頭部の穴部を予め溶融温度近くまで加熱した状態で湾曲状凹部を有する加圧パンチにて加圧して密閉溶着するようにしたから、袋頭部の側部は勿論その頂部においても切削傷や切断傷などの残らない美しい袋ナットを製造することができる。しかも、加圧パンチにより袋頭部の穴部を密閉溶着する際、袋頭部の内面を受け止める湾曲状凸部を有する受けポンチを備えているので、受けポンチの湾曲状凸部と加圧パンチの湾曲状凹部とで袋頭部の頂部部分を挟み込んで所定の形状に成形しながら密閉溶着することができ、これにより、袋頭部の頂部部分を所望する形状の通りに、つまり加圧パンチの湾曲状凹部の形状通りに正確にかつ容易に形成することができる。また、加圧パンチの内面に商標やサイズ、ナンバー等の圧印凹凸部を設けておけば、加圧パンチによる穴部の密閉溶着時に同時に袋ナットの袋頭部に商標やサイズ、ナンバー等の圧印を施すことができ、使用時の判別、宣伝等に効果がある。
【００２２】
また、未成形として残る袋頭部の穴部を回転かしめパンチにて回転しながら叩きかしめることにより閉塞するようにした場合にも、袋頭部の側部は勿論その頂部においても切削傷や切断傷などの残らない美しい袋ナットを製造することができる。しかも、回転かしめパンチにより袋頭部の穴部を閉塞する際、袋頭部の内面を受け止める湾曲状凸部を有する受けポンチを備えているので、受けポンチの湾曲状凸部と回転かしめパンチの湾曲状凹部とで袋頭部の頂部部分を挟み込むように叩きかしめて所定形状に成形しながら閉塞できるので、袋頭部の頂部部分を所望する形状の通りに、つまり、受けポンチの湾曲状凸部の形状通りに正確にかつ容易に形成することができる。
【図面の簡単な説明】
【図１】本発明で使用するナット素体の縦断面図である。
【図２】ねじ立てが施されたナット素体の縦断面図である。
【図３】穴部付袋頭部を有するナット素体の縦断面図である。
【図４】加圧パンチによる穴部の密閉溶着開始前の縦断面図である。
【図５】加圧パンチによる穴部の密閉溶着終了時の縦断面図である。
【図６】別の実施の形態を示す穴部の閉塞開始前の縦断面図である。
【図７】同穴部の閉塞終了時の縦断面図である。
【符号の説明】
１ ナット素体
２ ナット本体
２ｂ ねじ孔
３ 中空円筒体
４ 袋頭部
４ａ 穴部
９ 受けポンチ
９ａ 湾曲状凸部
１０ 加圧パンチ
１１ａ 湾曲状凹部
１３ 受けポンチ
１３ａ 湾曲状凸部
１４ 回転かしめパンチ
１４ａ 湾曲状凹部
Ｎ，Ｎ′ 袋ナット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a cap nut.
[0002]
[Prior art]
Conventionally, as a method of manufacturing a cap nut, for example, a nut member composed of a nut body and a hollow cylindrical portion integrally formed on the head side of the nut body is formed, and a tapping hole is formed in a threaded hole of the nut body. After that, the nut member is rotated at a high speed, and a plurality of rollers rotating at a high speed in a direction opposite to the hollow cylindrical portion are pressed against the hollow cylindrical portion from the outside, and the top portion is deformed into a bag shape at the tip of the hollow cylindrical portion, and the top portion is deformed. There is known a method in which a bag head is formed by welding and then burrs generated on a weld top of the bag head are scraped off (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-57-160586 (page 1, FIG. 3)
[0004]
[Problems to be solved by the invention]
However, in the conventional method of manufacturing a cap nut described above, a portion (burr) overlapping with the front end of the hollow cylindrical portion, that is, the top of the bag portion, occurs when the head of the bag is formed by a plurality of rollers. Therefore, a step of shaving off the overlapped portion is specially required as a post-process, and further, the shaved portion remains as a cut and the appearance is deteriorated. In addition, there is a limit in the molding of the bag head only by pressing from the outside of the plurality of rollers, and it is difficult to accurately form bag heads of various shapes.
[0005]
Therefore, an object of the present invention is to provide a method of manufacturing a cap nut capable of easily and accurately forming bag heads of various shapes and manufacturing a beautiful cap nut having no cutting scratches or cutting scratches on the bag head. I do.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 of the present application firstly disposes a nut body consisting of a nut body and a hollow cylindrical portion integrally formed on the head side of the nut body. Punching into a mold having a curved concave portion in the portion, the tip of the hollow cylindrical portion is curved along the curved concave portion at the back in the mold, and the bag head having a hole at the top is removed. Molding, and then supporting the top inner surface of the bag head with a receiving punch having a curved convex portion at the tip, and under a state where the hole portion of the bag head has been heated to near the melting temperature in advance, The hole portion of the bag head is pressurized from the outside with a pressure punch having a curved concave portion, so that the hole portion is hermetically welded.
[0007]
The invention according to claim 2 of the present application has a nut body composed of a nut main body and a hollow cylindrical portion integrally formed on the head side of the nut main body, and has a curved concave portion at the back. The tip of the hollow cylindrical portion is bent along the curved concave portion at the back of the mold by punching into the mold with a punch to form a bag head having a hole at the top, and then the bag head. The inner surface of the bag is supported by a receiving punch having a curved convex portion at the tip, and a rotating caulking punch having a curved concave portion is coaxially rotated with the nut body under the supported state, and a hole in the bag head is formed. The hole portion is closed by tapping the portion from outside.
[0008]
Further, in the invention according to claim 3 of the present application, the hole portion of the bag head is closed by a rotary caulking punch in a state where the hole portion of the bag head is heated to near the melting temperature in advance by the heating means. It is characterized by doing so.
[0009]
Further, the invention according to claim 4 of the present application is the manufacturing method according to claim 1 or 2, wherein the nut body is integrally formed with a nut main body having a screw hole and a head side of the nut main body. And a hollow cylindrical portion having an inner hole having a larger diameter than the root diameter of the screw hole.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, as shown in FIG. 1, a nut body 2 having a screw hole 2 a and a hollow having a diameter larger than that of the screw hole 2 a integrally formed on the head side of the nut body 2 and thinner than the nut body 2. The nut body 1 composed of the cylindrical portion 3 is formed by appropriate means such as forging or cutting. Thereafter, as shown in FIG. 2, the threaded hole 2 b of the nut body 2 of the nut body 1 is tapped with a screw hole 2 b. In forming the nut element body 1, if a hollow material having a through hole (a hollow cutting blank having a predetermined length) is forged by a forging machine (not shown), a large amount of nuts can be easily and quickly formed. It is preferable because the material 1 can be formed.
[0011]
Next, as shown in FIG. 3, the nut body 1 is driven into a mold 5 having a concave portion 5 a having a curved recess 5 a by a punch 6, and the tip of the hollow cylindrical portion 3 is bent into a curved shape in the mold 5. The bag head 4 is formed so as to be curved along the concave portion 4a and leave the hole 4a at the top. In FIG. 3, reference numeral 7 denotes a knockout pin for extruding the nut body 1 out of the mold 4 after molding.
[0012]
Thereafter, the hole 4a of the bag head 4 is heated in advance to a temperature close to the melting temperature by a heating means (not shown) such as a heater, and then the bottom surface of the nut body 1 is extruded as shown in FIG. In addition to being supported by the member / support member 8, the inner surface on the top side of the bag head 4 is supported by a receiving punch 9 having a curved convex portion 9a at the tip. Then, the hole 4a of the bag head 4 in the nut body 1 is pressed from the outside by the pressing punch 10 having the curved concave portion 10a. The hole 4a is hermetically welded by this pressurization to form a cap nut N as a final product as shown in FIG. 4 and 5, reference numeral 11 denotes a base member.
[0013]
According to the method for manufacturing the cap nut described above, the hole 4a of the cap head 4 is securely sealed and welded by pressurizing the hole 4a of the cap head 4 in a state of being heated to near the melting temperature in advance. This makes it possible to manufacture a beautiful cap nut N with no cuts or cuts remaining on the top as well as on the sides of the cap head 4. Moreover, since the bag is sandwiched between the curved convex portion 9a of the receiving punch 9 and the curved concave portion 10a of the pressure punch 10 and hermetically sealed while forming the top portion of the bag head into a predetermined shape, the top portion of the bag head 4 is formed. Can be accurately and easily formed in a desired shape, that is, in a shape of the curved concave portion 10a of the pressure punch 10. In addition, since the bag head portion 4 of the nut body 1 is heated in advance by a suitable heating means such as a heater and is hermetically welded under hot or warm conditions, the hermetic welding of the hole 4a is performed. It can be done quickly and easily.
[0014]
In addition, if the pressure punch 10 is provided with a stamped uneven portion such as a trademark, a size, and a number on the inner surface, the trademark, size, and number are simultaneously placed on the head of the cap nut when the hole 4a is sealed and welded by the pressure punch 10. Etc., which is effective for discrimination at the time of use, advertisement, and the like.
[0015]
6 and 7 show another embodiment, in which the hole 4a remaining in the bag head 4 is hermetically welded by a pressure punch 10 instead of the one in which the hole 4a is hermetically welded. It is closed by a rotary tapping method.
[0016]
In that case, first, the nut element 1 of FIG. 2 is formed from the nut element 1 of FIG. 1 by the same manufacturing process as in the previous embodiment, and then the hole 4a is formed at the top shown in FIG. The nut body 1 having the remaining bag head 4 is formed. Here, as a material of the nut body 1, a soft member such as aluminum or copper is used.
[0017]
Then, as shown in FIG. 6, the bottom surface of the nut body 1 is supported by the pushing member and the supporting member 12, and the receiving punch 13 having the curved convex portion 13 a at the tip of the top inner surface of the bag head 4. Support. Then, while rotating the rotary caulking punch 14 having the curved concave portion 14a coaxially with the nut body 1, the hole 4a of the bag head 4 is knocked from the outside, and the hole 4a is formed as shown in FIG. It is closed to form a cap nut N 'as a final product. 6 and 7, reference numeral 15 denotes a base member.
[0018]
According to such a manufacturing method of the cap nut, the hole 4a of the cap head 4 can be reliably closed by rotating and caulking while rotating with the punch 14, so that the side portion of the cap head 4 is, of course, at the top thereof. It is also possible to manufacture a beautiful cap nut N 'with no cuts or cuts. In addition, the top of the bag head is closed while being formed into a predetermined shape by striking the top of the bag head while being sandwiched between the curved protrusion 13a of the receiving punch 13 and the curved recess 14a of the rotary caulking punch 14. The portion can be formed accurately and easily according to a desired shape, that is, according to the shape of the curved convex portion 13a of the receiving punch 13.
[0019]
When the hole 4a of the bag head 4 is closed by tapping with the rotary caulking punch 14, if the material of the nut body 1 is a soft member such as aluminum or copper as in the above-described embodiment, it is cold. Depending on the material, the bag head 4 portion of the nut body 1 may be heated in advance by a suitable heating means, and may be closed by rotating and tapping under hot or warm conditions. You may. It is preferable to use such a heating means because the hole can be closed more quickly and easily.
[0020]
The material of the nut body 1 is not limited to a metal material, but may be a resin material or the like.
[0021]
【The invention's effect】
As described above, according to the method for manufacturing a cap nut of the present invention, the hole in the head of the bag remaining as unformed is pressurized with a pressure punch having a curved concave portion in a state where the hole is heated to near the melting temperature in advance. Since welding is performed, a beautiful cap nut free of cutting scratches and cuts can be manufactured not only on the side of the bag head but also on the top thereof. Moreover, when the hole of the bag head is hermetically welded by the pressure punch, the receiving punch having the curved convex portion for receiving the inner surface of the bag head is provided. The top portion of the bag head can be hermetically sealed while being formed into a predetermined shape by sandwiching the top portion of the bag head with the curved concave portion of the bag. Can be accurately and easily formed according to the shape of the curved concave portion. Also, if the stamping punch has irregularities such as a trademark, size, number, etc. on the inner surface of the pressure punch, the trademark, size, number, etc. will be stamped on the head of the bag nut at the same time when the hole is sealed and welded by the pressure punch. Can be applied, which is effective for discrimination at the time of use, advertisement and the like.
[0022]
Also, when the hole portion of the bag head remaining as unformed is closed by rotating and swaging with a punch while rotating and punching, even if the side portion of the bag head is cut as well as the top portion, cutting scratches and the like may occur. It is possible to manufacture beautiful cap nuts without cutting scratches. In addition, when the hole in the bag head is closed by the rotary caulking punch, a receiving punch having a curved convex portion for receiving the inner surface of the bag head is provided, so that the curved convex portion of the receiving punch and the rotary caulking punch are provided. Since the top portion of the bag head can be closed while being formed into a predetermined shape by tapping and crimping so as to sandwich the top portion of the bag head with the curved concave portion, the top portion of the bag head has a desired shape, that is, the curved convex portion of the receiving punch. It can be formed accurately and easily according to the shape of the part.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a nut body used in the present invention.
FIG. 2 is a longitudinal sectional view of a nut body on which tapping has been performed.
FIG. 3 is a longitudinal sectional view of a nut body having a bag head with a hole.
FIG. 4 is a longitudinal sectional view before the start of hermetic welding of a hole by a pressure punch.
FIG. 5 is a longitudinal sectional view at the end of hermetically welding a hole by a pressure punch.
FIG. 6 is a longitudinal sectional view showing another embodiment before closing of a hole is started.
FIG. 7 is a vertical cross-sectional view when the closing of the hole is completed.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 nut body 2 nut body 2 b screw hole 3 hollow cylindrical body 4 bag head 4 a hole 9 receiving punch 9 a curved convex portion 10 press punch 11 a curved concave portion 13 receiving punch 13 a curved convex portion 14 rotary swaging punch 14 a Curved concave N, N 'Cap nut

Claims (4)

まず、ナット本体と、そのナット本体の頭部側に一体形成された中空円筒部とからなるナット素体を、奥部に湾曲状凹部を有する金型内にパンチにより打ち込んで、中空円筒部の先端を金型内の奥部の湾曲状凹部に沿うように湾曲させて頂部に穴部が残った袋頭部を成形し、次いで、袋頭部の頂部内面を先端に湾曲状凸部を有する受けポンチにて支持し、かつ、袋頭部の穴部部分を予め溶融温度近くまで加熱した状態のもとで、湾曲状凹部を備えた加圧パンチにて袋頭部の穴部部分を外側から加圧することにより穴部を密閉溶着するようにしたことを特徴とする袋ナットの製造方法。First, a nut body composed of a nut body and a hollow cylindrical portion integrally formed on the head side of the nut body is punched into a mold having a curved concave portion at the back by a punch, and the hollow cylindrical portion is formed. The tip is curved along the curved concave part at the back in the mold to form a bag head with a hole at the top, and then has a curved convex part at the top inside surface of the top of the bag head. Support the hole with a receiving punch and heat the hole of the bag head to near the melting temperature in advance. A method for producing a cap nut, characterized in that the hole is hermetically welded by applying pressure. まず、ナット本体と、そのナット本体の頭部側に一体形成された中空円筒部とからなるナット素体を、奥部に湾曲状凹部を有する金型内にパンチにより打ち込んで、中空円筒部の先端を金型内の奥部の湾曲状凹部に沿うように湾曲させて頂部に穴部が残った袋頭部を成形し、次いで、袋頭部内面を先端に湾曲状凸部を有する受けポンチにて支持し、その支持状態のもとで湾曲状凹部を備えた回転かしめパンチをナット素体と同軸状に回転させながら袋頭部の穴部部分を外側から叩きかしめて穴部を閉塞するようにしたことを特徴とする袋ナットの製造方法。First, a nut body composed of a nut body and a hollow cylindrical portion integrally formed on the head side of the nut body is punched into a mold having a curved concave portion at the back by a punch, and the hollow cylindrical portion is formed. The tip is curved so as to follow the curved concave portion at the back in the mold to form a bag head having a hole at the top, and then a receiving punch having a curved convex portion at the inner surface of the bag head. In this state, the swaging punch provided with the curved concave portion is rotated coaxially with the nut body, and the hole portion of the bag head is beaten from the outside to close the hole portion. A method for manufacturing a cap nut, characterized in that: 袋頭部の穴部部分を加熱手段により予め溶融温度近くまで加熱した状態のもとで、回転かしめパンチにて袋頭部の穴部を閉塞するようにしたことを特徴とする請求項２に記載の袋ナットの製造方法。The hole portion of the bag head is closed with a rotary caulking punch in a state where the hole portion of the bag head is heated to near the melting temperature in advance by the heating means. A method for producing the cap nut described in the above. ナット素体は、ねじ孔を有するナット本体と、そのナット本体の頭部側に一体に連設され、かつねじ孔の谷径よりも大径の内孔を有する中空円筒部とを備えていることを特徴とする請求項１又は請求項２に記載の袋ナットの製造方法。The nut body includes a nut body having a screw hole, and a hollow cylindrical portion integrally and continuously provided on the head side of the nut body and having an inner hole having a diameter larger than the root diameter of the screw hole. The method for manufacturing a cap nut according to claim 1 or 2, wherein
JP2003102229A 2003-02-28 2003-02-28 Cap nut manufacturing method Expired - Fee Related JP4605517B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2922128A1 (en) * 2007-10-11 2009-04-17 Peugeot Citroen Automobiles Sa Metallic fluid tube closing method for forming pressurized oil body of hydraulic shock absorber of automobile, involves locally deforming deposit channel of closed end of tube, where tube is not sealed to fluid
JP2012077816A (en) * 2010-09-30 2012-04-19 Hi-Lex Corporation Control cable
CN105537405A (en) * 2016-01-20 2016-05-04 常州协发机械制造有限公司 Edge turning-up die for edge turning-up inside sealing head
CN113714364A (en) * 2021-08-17 2021-11-30 浙江桢利汽车零部件有限公司 Quick connector and crimping tool and assembly process thereof
CN114871691A (en) * 2021-12-26 2022-08-09 湖北博士隆科技有限公司 Forming process of cover-shaped welded nut

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001038436A (en) * 1999-07-27 2001-02-13 Koa Seisakusho:Kk Manufacture of hollow element

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001038436A (en) * 1999-07-27 2001-02-13 Koa Seisakusho:Kk Manufacture of hollow element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2922128A1 (en) * 2007-10-11 2009-04-17 Peugeot Citroen Automobiles Sa Metallic fluid tube closing method for forming pressurized oil body of hydraulic shock absorber of automobile, involves locally deforming deposit channel of closed end of tube, where tube is not sealed to fluid
JP2012077816A (en) * 2010-09-30 2012-04-19 Hi-Lex Corporation Control cable
CN105537405A (en) * 2016-01-20 2016-05-04 常州协发机械制造有限公司 Edge turning-up die for edge turning-up inside sealing head
CN113714364A (en) * 2021-08-17 2021-11-30 浙江桢利汽车零部件有限公司 Quick connector and crimping tool and assembly process thereof
CN113714364B (en) * 2021-08-17 2024-03-26 浙江桢利汽车零部件有限公司 Quick connector, crimping tool and assembly process thereof
CN114871691A (en) * 2021-12-26 2022-08-09 湖北博士隆科技有限公司 Forming process of cover-shaped welded nut

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