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JP2004188484A - Method for fixing small-diameter pin to sheet - Google Patents

Method for fixing small-diameter pin to sheet Download PDF

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Publication number
JP2004188484A
JP2004188484A JP2002362473A JP2002362473A JP2004188484A JP 2004188484 A JP2004188484 A JP 2004188484A JP 2002362473 A JP2002362473 A JP 2002362473A JP 2002362473 A JP2002362473 A JP 2002362473A JP 2004188484 A JP2004188484 A JP 2004188484A
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JP
Japan
Prior art keywords
thin plate
small
pin
diameter pin
pressing
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
JP2002362473A
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Japanese (ja)
Inventor
Hideyuki Miyahara
英行 宮原
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.)
Nakamura Manufacturing Co Ltd
Nakamura Seisakusho KK
Original Assignee
Nakamura Manufacturing Co Ltd
Nakamura Seisakusho 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 Nakamura Manufacturing Co Ltd, Nakamura Seisakusho KK filed Critical Nakamura Manufacturing Co Ltd
Priority to JP2002362473A priority Critical patent/JP2004188484A/en
Publication of JP2004188484A publication Critical patent/JP2004188484A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing method of a small-diameter pin to a sheet by which the small-diameter pin is firmly caulked and fixed even when there is dispersion in the inside diameter of a through hole pierced in a thin sheet. <P>SOLUTION: This method is a projecting shaft fixing method by which the through hole is formed in the sheet such as a metallic sheet having plasticity and one end of a pin is fit into this through hole and caulked. After the one end of the small-diameter pin 3 is fit into the through hole 2, the pin is fixed by caulking by pressing the sheet 1 on the circumference of the small-diameter pin 3 in the thickness direction with a pressing tool 10, strongly pressed by moving the thickness of the sheet 1 in the direction of one end of the small-diameter pin 3 and fixed by caulking. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、板厚の小さな薄板に小径ピンの一端を固着する方法に関し、特に、薄板の板厚が0.6mm以下の薄板に外径寸法が0.8mm以下の小径ピンを固着する固着方法に関するものである。
【0002】
【従来の技術】
近年における各種機器の軽薄短小化は加速度を増し、種々の加工が微少化している。このような軽薄短小化される機器の部品加工においても、金属板等からなる板材に軸等の小径ピンを形成する加工が行われている。一例としては、図7に示すように、板材から軸等のピンを一体に突出形成する方法が行われる。この形成方法は、プレス機に設置したダイに金属板からなる薄板50を載置した後、裏面からパンチによって凹部50aを押圧形成すると同時に凹部50aの肉を上記ダイの穴に移行させて表面側にピン51を突出させている。
【0003】
ところが、このような方法は、ピン51の高さを薄板50の板厚の2倍程度とすることが限界であり、長尺な高さのピンを形成することができない問題点がある。しかも、ピン51を形成するときに薄板50に応力を与えることから、図7に示すように、薄板50の特にピン51の周囲が変形して平面度を悪化させる要因となる。このような変形は、平押し加工等によって矯正しても、形成時に与えた応力よって経時的に変化することから、熱処理等の他の変形を防止するための処理を行う必要が生ずる。
【0004】
薄板に必要十分な高さのピンを形成する方法としては、一般に薄板に穿設した穴にピンを圧入によって固着する方法が行われる。図8(A)(B)(C)は固着方法を示している。図8(A)は、ピン61を植設するための薄板60であり、ピン61の外径寸法よりもやや小さな内径寸法φ1の穴60aが穿設される。通常の場合、加工された薄板60は、次の工程において、化成処理等によってバリ取りを行う他、メッキ等の表面処理が施される。薄板60にメッキを行う場合には、剥離等を避けるために表面に付着した油脂を除去すると共に、メッキに適する面粗度とするために化成処理等の前処理が施される。
【0005】
ところが、化成処理によって浸食される深さはほぼ一定であるため、薄板の場合には板厚に対する浸食が大きくなる。従って、必然的に図8(B)に示すように、処理後の穴60aの内径寸法φ2が大きくなる。特に上下の表面に近い開口部分が浸食されることから、穴60aの断面形状が略鼓形に形成される。この穴60aにピン61を圧入した場合には、穴径が大きいことに加え、薄板のために圧入代が小さいことから十分な圧力が得られず、しかも、穴60aが略鼓形に形成されていることから、ピン61が薄板60から離脱することがあり、また、図8(C)に示すようにピン61が傾斜する問題が生ずる。
【0006】
薄板にピンを固着する方法として、かしめによる方法が採用されている。特開2002−248531号公報(特許文献1)に開示された方法は、板金70の軸71を接合する位置には、図9(A)に示すように、多角形孔72を穿設し、この多角形孔72に軸71の段差部71aの先端が多角形孔72から突出するように挿通する。次に、断面を円形に形成した軸71の段差部71aの先端を、上記多角形孔72と略同一形状のパンチを用い、板金70の多角形孔72とほぼ同一形状に塑性変形させてかしめる。
【0007】
このようにかしめられた軸71の段差部71aは、多角形孔72の孔側面と多角形の面で面接触させることにより軸71の回転を規制し、より高い回転トルクに耐えることができるようにしている。
【0008】
【特許文献1】
特開特開2002−248531号公報
【0009】
【発明が解決しようとする課題】
上述したピンを薄板にかしめによって固着する方法は、多角形孔72と略同一形状のパンチを用いて軸71の段差部71aの先端を塑性変形させてかしめるので、板金70の表面には段差部71aの先端のかしめ部73が突出する。薄型化させようとする機器の部品としては、かしめ部73の突出が障害となる。また、軸71の外径寸法を0.8mm以下の小径とした場合には、段差部71aの形成が困難になる。更に、小径となった段差部71aをかしめるときに、パンチと段差部71aの中心を高精度に一致させる必要なあり、微少寸法のすれが生じてもかしめ部73が偏奇するため、かしめ強度が低下する問題がある。
【0010】
本発明は、上記実状に鑑み、肉薄な薄板に穿設した透孔の内径寸法にばらつきがあっても小径なピンを強固にかしめ固着することができる薄板への小径ピンの固着方法を提供しようとするものである。
【0011】
【課題を解決するための手段】
上記目的を達成するために、本発明の請求項1に記載の薄板への小径ピンの固着方法は、可塑性を有する金属板等の薄板に透孔が形成され、この透孔にピンの一端を嵌合すると共にかしめにより固着する突軸固着方法であって、上記透孔に小径ピンの一端を嵌合した後、押圧具により上記小径ピンの周囲の上記薄板を板厚方向に押圧し、上記薄板の肉を上記小径ピンの一端方向に移動させることにより強圧してかしめ固着することを特徴としている。
【0012】
かかる請求項1に記載の発明によれば、薄板の肉を小径ピンの一端方向に移動させることによりかしめ固着するので、薄板の形成した透孔の内径寸法にばらつきがあっても、小径ピンを強固に固着することができる。また、薄板の肉の移動によって小径ピンを固着するので、0.8mm以下の小径なピンであっても容易にかしめ固着することができる。更に、小径ピンの一端面を薄板と同一面とすることが可能であり、部品の薄型化が実現できる。
【0013】
また、本発明の請求項2に記載の発明は、上記薄板は板厚が0.6mm以下であり、上記小径ピンの外径寸法が0.8mm以下であることを特徴としている。
【0014】
かかる請求項2に記載の発明によれば、板厚が0.6mm以下の薄板に、外径寸法が0.8mm以下の小径ピンであっても、薄板の肉を移動させることにより小径ピンを固着するので、容易にかしめ固着できる。
【0015】
更に、本発明の請求項3に記載の発明は、上記薄板は、ポンチによって上記透孔を穿設した後、上記薄板や上記透孔内に化成処理もしくはメッキを施したことを特徴としている。
【0016】
かかる請求項3に記載の発明によれば、化成処理もしくはメッキによって薄板や透孔内の内径寸法が大きくばらつくが、薄板の肉の移動によってピンを固着するので、透孔の内径寸法のばらつきを吸収することができ、必要な強度によって小径ピンをかしめ固着することができる。
【0017】
また、本発明の請求項4に記載の発明は、上記押圧具は、上記小径ピンの挿入を許容すると共に上記小径ピンの長さより上記薄板の板厚分だけ短い深さの嵌合穴と、この嵌合穴の周囲に突出形成した押圧部とを有する保持具と、上記薄板を押圧部方向に押圧する押圧パンチからなり、上記小径ピンを上記嵌合穴に挿入すると共に上記透孔を上記小径ピンの一端に挿入して上記薄板の一方面を上記押圧部に載置した後、上記薄板の他方面から先端面を平坦に形成した押圧パンチを押圧し、上記押圧部により上記透孔の周囲を押圧して上記薄板の肉を上記小径ピンの一端方向に移動させることを特徴としている。
【0018】
かかる請求項4に記載の発明によれば、保持具の嵌合穴に小径ピンを挿入することにより固定させ、この状態から保持具の押圧部により薄板の肉を小径ピンの方向に移動させて固着するので、小径ピンの外径寸法が0.8mm以下の小径であっても保持具の嵌合穴に挿入することによって精度良くかしめ固着することができる。また、保持具に形成した嵌合穴の周囲に押圧部を突出形成したので、ピンとかしめ部との位置が一定となり、かしめ固着のばらつきを解消することができる。
【0019】
更にまた、本発明の請求項5に記載の発明は、上記小径ピンの挿入を許容すると共に上記小径ピンの長さより上記薄板の板厚分だけ短い深さの嵌合穴と、この嵌合穴の周囲に突出形成した押圧部とを有する保持具と、上記嵌合穴の周囲に対向させて突出形成した押圧部を有する押圧パンチからなり、上記小径ピンを上記嵌合穴に挿入すると共に上記透孔を上記小径ピンの一端に挿入して上記薄板の一方面を上記保持具に載置した後、上記薄板の他方面から上記押圧パンチを押圧し、上記押圧部により上記透孔の周囲を押圧して上記薄板の肉を上記小径ピンの一端方向に移動させることを特徴としている。
【0020】
かかる請求項5に記載の発明によれば、保持具の嵌合穴に小径ピンを挿入することにより固定し、この状態から薄板を押圧パンチの押圧部により押圧して薄板の肉を小径ピン方向に移動させて固着するので、小径ピンの外径寸法が0.8mm以下の小径であっても保持具の嵌合穴に挿入することにより、変形させることなく精度良くかしめ固着することができる。
【0021】
更に、本発明の請求項6に記載の発明は、上記押圧部は、上記薄板の板厚が半分以下の高さを有し、上記小径ピンを中心とした環状の突堤状に突出形成され、内周面にテーパ面を形成した略擂り鉢状に形成したことを特徴としている。
【0022】
かかる請求項6に記載の発明によれば、小径ピンを中心とした環状の突堤状に突出形成した押圧部を内周面にテーパ面を形成した略擂り鉢状に形成すると、薄板を押圧部によって押圧したとき、上記テーパ面によって肉が小径ピンの方向に移動し、小径ピンを更に強固に固着することが可能となる。このとき、押圧部の高さを薄板の半分以下に形成しても、小径ピンの方向に移動する肉の量が増加しているので、少ない押圧量で強固な固着が可能となる。
【発明の実施の形態】
以下、図面に基づいて本発明の実施の形態を詳細に説明する。
【0023】
図1および図2は、本発明にかかる薄板への小径ピンの固着方法によって、薄板1に小径ピン3を固着した状態を示している。鉄、ステンレス、銅、真鍮等の金属板からなる薄板1は、0.6mm以下の肉薄の板厚である。薄板1にポンチ等により穿設された透孔2には、外径寸法が0.8mm以下の鉄、ステンレス、銅、真鍮等の金属材からなる円柱状の小径ピン3の基端側が、上述する固着方法によって一体的に固着されている。そして、薄板1の外周近傍には、凹部4が形成されている。
【0024】
上記薄板1の表面、および、小径ピン3には、図2に示すように、化成処理および、またメッキ等の表面処理が施され、点線で示す処理層5、6が形成されている。化成処理はメッキ等の表面処理を施す前処理として行うものであり、薄板1の表面とメッキ層との剥離を防止するために、表面に付着した異物を除去すると共に、所定の粗さの面粗度に仕上げるための処理であり、この種の金属部品に対して通常行われる処理である。化成処理を行った後に、メッキ、防錆処理、或いは塗装等の表面処理が施される。このような表面処理は、薄板1、小径ピン3を加工した後に行われ、従って、薄板1の透孔2内にも表面処理が施される。
【0025】
このような0.8mm以下の小径ピン3を固着する透孔2は、内径寸法がほぼ0.8mm以下のために、板厚方向の中心部分は処理され難い。この結果、透孔2は、表面側の内径寸法が大きく、中心部分に至るに従って内径寸法が小さくなり、断面形状が略鼓型に形成され、しかも、表面処理は必ずしも一定ではないので透孔2の内径寸法は大きくばらつきが生ずる。一方、小径ピン3も小径のために、表面処理を施した場合には、上記薄板1と同様に外径寸法にばらつきが生ずる。
【0026】
次に、薄板1のばらつきが大きい内径寸法の透孔2に、ばらつきの大きな外径寸法を有する小径ピン3をかしめによって固着する方法について、図3に基づいて説明する。
【0027】
図3において、薄板1に小径ピン3をかしめ固着する押圧具10は、小径ピン3を位置決め固定するための嵌合穴11aを形成した保持具11と、この保持具11の底面側に当接して嵌合穴11aを閉塞するように設けた閉塞板12と、保持具11の上面側から薄板1を押圧する先端面を平坦に形成した押圧パンチ13から構成されている。
【0028】
保持具11に形成された嵌合穴11aの周囲には、押圧部14が突出形成されている。押圧部14は、嵌合穴11aを囲むように環状に一体形成され、保持具11の上面からの高さ、および、厚さは、薄板1の板厚のおよそ2分の1から4分の1程度に設定されている。従って、嵌合穴11aの軸方向寸法は、押圧部14が突出形成されたことにより保持具11の厚さよりも大きくなる。また、保持具11の高さは、小径ピン3の長さから薄板1の板厚を差し引いた寸法に設定される。保持具11の上面側は、上記押圧部14を除き平坦に形成されている。
【0029】
以上のように構成された保持具11に対し、図3(A)に示すように、保持具11の嵌合穴11aに小径ピン3を挿入し、図3(B)に示すように、小径ピン3の他端を閉塞板12に当接させ、保持具11の上面側から小径ピン3の一端を突出させる。このとき、小径ピン3の突出寸法は、薄板1の板厚にほぼ等しい寸法となっている。次に、図3(B)に示すように、薄板1の透孔2を小径ピン3の一端に挿入し、透孔2の周囲を押圧部14の上面に載置する。その後、押圧パンチ13により薄板1の他方面を押圧することにより、薄板1の透孔2の周囲が押圧部14により圧潰され、図3(C)に示すように凹所4が形成され、この凹所4の肉が小径ピン3の一端方向に移動する。この結果、小径ピン3の一端は薄板1の肉によって強圧され、強固にかしめ固着される。
【0030】
押圧パンチ13を押圧すると、やがて押圧パンチ13の先端面が小径ピン3の一端面に当接すると共に、薄板1の一方面が保持具11の上面に面接合する。これにより押圧パンチ13の移動が制限されるので、適正な肉の移動量によって小径ピン3をかしめ固着することができる。また、薄板1が押圧パンチ13の先端面と保持具11の上面との間で平押しが行われることから、薄板1の平面度を良好にすることも可能となる。
【0031】
以上のように、図3によって示した実施態様によれば、薄板1の透孔2に嵌合した小径ピン3を、薄板1の肉を小径ピン3の一端方向に移動させることによりかしめ固着するので、透孔2の内径寸法のばらつき、或いは、小径ピン3の外径寸法のばらつきがあっても、小径ピン3を強固にかしめ固着することができる。しかも、外径寸法を0.8mm以下とした小径のピン3であっても、小径ピン3を塑性変形しないので、容易にかしめ固着することができる。また、小径ピン3を保持具10の嵌合穴11aに挿入した状態でかしめ固着するので、高精度なかしめ固着が実現できる。更に、嵌合穴11aの周囲に押圧部14を突出形成したので、小径ピン3をかしめ固着する位置が一定となり、ばらつきを解消することができる等の特徴を有する。
【0032】
上述した実施態様において、保持具11の嵌合穴11aの周囲に突出形成した押圧部14を、図4(A)に示すように、嵌合穴11aを囲むように環状に一体形成したが、図4(B)に示すように、複数個の押圧突起を環状に配列するようにしても良い。即ち、保持具11の嵌合穴11aの周囲を囲むように、複数個の押圧突起15が等角度間隔に配列している。この押圧突起15も前述した押圧部14と同様に、保持具11の上面からの高さ、および、厚さを、薄板1の板厚のおよそ2分の1から4分の1程度に設定されている。
【0033】
このように、複数個の押圧突起15を形成した保持具11に対し、前述の実施態様と同様に、保持具11の嵌合穴11aに小径ピン3を挿入して保持した後、保持具11の上面側に突出した小径ピン3の一端に薄板1の透孔2を挿入すると共に、透孔2の周囲を押圧部14の上面に載置する。その後、押圧パンチ13により薄板1の他方面を押圧することにより、薄板1の透孔2の周囲を押圧突起15により圧潰し、薄板1の肉を小径ピン3の一端方向に移動させる。小径ピン3の一端は、薄板1の肉の移動によって強圧され、強固にかしめ固着される。
【0034】
このとき、複数個の押圧突起15によって移動する薄板1の肉の量は、前述した実施態様の押圧部14より少なくなるが、薄板1の透孔2の内径寸法と小径ピン3の外径寸法の精度が比較的良好のときは、薄板1の肉の移動量が少なくて良いので、寸法精度のばらつきに応じて、複数個の押圧突起15を採用することが好ましい。尚、押圧突起15の個数は、適宜に設定可能であるが、かしめ固着の強度を小径ピン3の全周に対して一定とするために、等角度に配列することが望ましい。
【0035】
図5は、本発明の第2の実施態様を示し、押圧部を押圧パンチに突出形成したものである。薄板1に小径ピン3をかしめ固着する押圧具20は、小径ピン3を位置決め固定するための嵌合穴21aを形成すると共に、上面を平坦に形成した保持具21と、この保持具21の底面側に当接して嵌合穴21aを閉塞するように設けた閉塞板22と、保持具21の上面側から薄板1を押圧する押圧パンチ23から構成されている。
【0036】
押圧パンチ23の先端面には、保持具21に形成された嵌合穴21aと軸中心を一致させた押圧部24が突出形成されている。押圧部24は、押圧パンチ23を下降させたとき、嵌合穴21aを囲むように環状に一体形成され、保持具11の上面からの高さ、および、厚さは、薄板1の板厚のおよそ2分の1から4分の1程度に設定されている。また、保持具21の高さは、小径ピン3の長さから薄板1の板厚を差し引いた寸法に設定される。押圧パンチ23の先端面は、上記押圧部24を除き平坦に形成されている。
【0037】
次に、以上のように構成された押圧具20を用いて、薄板1の小径ピン3透孔2に小径ピン3の一端をかしめ固着する方法を説明する。先ず、図5(A)に示すように、保持具21の嵌合穴21aに小径ピン3を挿入すると共に、小径ピン3の他端を閉塞板22に当接させ、保持具11の上面側から小径ピン3の一端を突出させる。更に、薄板1の透孔2を小径ピン3の一端に挿入し、薄板1を保持具11の上面に載置する。このとき、小径ピン3の突出寸法が薄板1の板厚にほぼ等しい寸法となっているので、小径ピン3の端面と薄板1とは同一平面の形成される。その後、図5(B)に示すように、押圧パンチ23により薄板1の他方面を押圧することにより、薄板1の透孔2の周囲が押圧パンチ23に突出形成した押圧部24により圧潰され、薄板1の肉が小径ピン3の一端方向に移動する。この結果、小径ピン3の一端は、移動した肉に強圧されて強固にかしめ固着される。
【0038】
以上のように、図5によって示した第2の実施態様によれば、前述した実施態様と同様に、外径寸法を0.8mm以下とした小径のピン3であっても、薄板1の透孔2に嵌合した小径ピン3を、薄板1の肉を小径ピン3の一端方向に移動させることによりかしめ固着するので、透孔2の内径寸法のばらつき、或いは、小径ピン3の外径寸法にばらつきがある場合にも、小径ピン3を塑性変形することなく強固にかしめ固着することができる。また、薄板1に対して押圧パンチ23の押圧部24を裏面側から押圧して凹所を形成させ、この肉を小径ピン3方向に移動させて固着するので、小径ピン3を突出させた薄板1の表面側は平坦に形成されることから、美観を損なうことを未然に防止することができる。尚、この第2の実施態様においても、押圧パンチ23に突出形成した押圧部24を図4(B)に示すように、複数個の押圧突起を環状に配列するようにしても良い。
【0039】
図6は、押圧部の変形例を示している。以下、この例を前述した第1の実施態様に基づいて説明する。保持具11の嵌合穴11aの周囲に形成した押圧部30は、嵌合穴11aを囲むように環状の突堤状に一体に突出形成され、内周面は中心方向に至るに従って低くしたテーパ面31を形成した略擂り鉢状に形成している。そして、この押圧部30の高さを薄板1の板厚に対して半分以下の高さに設定している。更に、保持具11の上面側は、上記押圧部30を除き平坦に形成されている。
【0040】
以上のように構成された保持具11に対し、保持具11の嵌合穴11aに小径ピン3を挿入すると共に、他端を閉塞板12に当接させ、保持具11の上面側から小径ピン3の一端を突出させる。次に、薄板1の透孔2を小径ピン3の一端に挿入し、透孔2の周囲を押圧部30の上面に載置する。その後、押圧パンチ13により薄板1の他方面を押圧することにより、薄板1の透孔2の周囲が押圧部30により圧潰され、薄板1の肉が小径ピン3の一端方向に移動する。押圧パンチ13を押圧したとき、押圧部30の内周面に形成したテーパ面31によって、薄板1の肉が矢示のように小径ピン3の方向に集中的に向けられる。この結果、前述した押圧部よりも多くの肉が小径ピン3方向に移行し、小径ピン3の一端は薄板1の肉の移動によって強圧され、強固にかしめ固着される。
【0041】
以上のように、押圧部30の内周面にテーパ面31を形成することにより、小径ピン3の一端方向に移動させる薄板1の肉の移動量を多くなるので、押圧部30が前述した実施態様の押圧部よりも低く設定しても小径ピン3を強固にかしめ固着することが可能となる。従って、板厚を0.3mm以下とした薄板1のように、本来の肉量が少ない場合であっても、テーパ面31による肉の移動量を多くすることにより、必要十分な強度により小径ピン3をかしめ固着することが可能となる。また、押圧部30の押圧深さと押圧力を小さくできることから、薄板1に与えるストレスを小さくすることができるので、薄板1の変形を軽減することができると共に、小径ピン3を高精度にかしめ固着することができる。
【0042】
本発明は、以上説明した実施形態に限定されることなく、本発明を逸脱しない範囲において種々変更可能であることは言うまでもない。例えば、薄板1の透孔2にかしめ固着する小径ピン3は、円柱状のみならず、角柱状、或いは円錐台状や角錐台状であっても良く、また、小径ピン3の先端を平坦、円錐状等に変更しても良い。更に、保持具11と押圧パンチ13が対向する面を平坦面に形成したが、小径ピン3をかしめ固着するときに、曲げ加工、絞り加工、或いは切断加工等を同時に行うように保持具11と押圧パンチ13が対向する面を各種の加工に合わせるように構成しても良い。
【0043】
【発明の効果】
以上説明した本発明によれば、請求項1記載の発明にかかる薄板への小径ピンの固着方法では、薄板の形成した透孔に嵌合した小径ピンを、薄板の肉をピンの一端方向に移動させることによりかしめ固着するので、薄板の形成した透孔の内径寸法、或いは、小径ピンの外径寸法にばらつきがあっても、強固に固着することができる。また、小径ピンの外径寸法が0.8mm以下であっても、小径ピンを塑性変形させることなく容易にかしめ固着することができる。更に、ピンの一端面を薄板と同一面とすることが可能であり、部品の薄型化が実現できる。
【0044】
また、請求項2に記載の薄板への小径ピンの固着方法によれば、薄板の板厚が0.6mm以下、小径ピンの外径寸法が0.8mm以下であっても、薄板の肉の移動によってピンを固着するので、容易にかしめ固着できる。
【0045】
さらに、請求項3に記載の薄板への小径ピンの固着方法によれば、化成処理もしくはメッキによって薄板の透孔内の内径寸法に大きなばらつきがあっても、薄板の肉の移動によってピンを固着するので、透孔の内径寸法のばらつきを吸収することができ、必要な強度によって小径なピンをかしめ固着することができる。
【0046】
また、請求項4に記載の薄板への小径ピンの固着方法によれば、保持具の嵌合穴にピンを挿入することによりピンを固定させるので、ピンの外径寸法が0.8mm以下の小径であっても精度良くかしめ固着することができる。また、保持具に形成した嵌合穴の周囲に押圧部を突出形成したので、ピンとかしめ部との位置が一定となり、かしめ固着のばらつきを解消することができる。
【0047】
更にまた、請求項5に記載の薄板への小径ピンの固着方法によれば、保持具の嵌合穴にピンを挿入することによりピンを固定させ、この状態から薄板を押圧パンチの押圧部により押圧して薄板に凹所を形成させると共に肉をピン方向に移動させて固着するので、ピンの外径寸法が0.8mm以下の小径であっても保持具の嵌合穴に挿入することにより、変形させることなく精度良くかしめ固着することができる。
【0048】
また、請求項6に記載の薄板への小径ピンの固着方法によれば、押圧部を内周面にテーパ面を形成した略擂り鉢状に形成すると、薄板を押圧部によって押圧したとき、上記テーパ面によって小径ピンの方向への肉の移動量が増加し、少ない押圧量でも更に強固に固着することが可能となる。
【図面の簡単な説明】
【図1】本発明にかかる薄板への小径ピンの固着方法による一実施態様を示す斜視図である。
【図2】本発明にかかる薄板への小径ピンの固着方法によって薄板に固着された小径ピンを示す断面図である。
【図3】(A)乃至(C)は、本発明にかかる薄板への小径ピンの固着方法の工程を示す工程説明図である。
【図4】(A)(B)は、本発明にかかる押圧部の例を示す要部平面図である。
【図5】(A)(B)は、本発明にかかる薄板への小径ピンの固着方法の第2の実施態様を示す工程説明図である。
【図6】本発明にかかる薄板への小径ピンの固着方法の押圧部の変形例を示す断面図である。
【図7】従来の方法によって薄板へピンを形成した状態を示す断面図である。
【図8】(A)乃至(C)は、従来の薄板へのピンの固着方法を示す説明図である。
【図9】(A)(B)は、従来のかしめによって薄板へピンを形成する方法を示す斜視図、断面図である。
【符号の説明】
1 薄板
2 透孔
3 小径ピン
4 凹部
10 押圧具
11 保持具
11a 嵌合穴
12 閉塞板
13 押圧パンチ
14 押圧部
30 押圧部
31 テーパ面
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for fixing one end of a small-diameter pin to a thin plate having a small thickness, and in particular, a fixing method for fixing a small-diameter pin having an outer diameter of 0.8 mm or less to a thin plate having a thickness of 0.6 mm or less. It is about.
[0002]
[Prior art]
In recent years, the reduction in size and weight of various devices has increased the acceleration, and various types of processing have been miniaturized. In the processing of components for such light and thin devices, a process of forming a small-diameter pin such as a shaft on a plate made of a metal plate or the like is performed. As an example, as shown in FIG. 7, a method of integrally forming a pin such as a shaft from a plate material is performed. In this forming method, after the thin plate 50 made of a metal plate is placed on a die installed in a press machine, the concave portion 50a is pressed and formed from the rear surface, and at the same time, the meat of the concave portion 50a is transferred to the hole of the die and the front surface side is formed. The pin 51 is projected.
[0003]
However, such a method has a problem that the height of the pin 51 is limited to about twice the thickness of the thin plate 50, and a pin having a long height cannot be formed. Moreover, since stress is applied to the thin plate 50 when the pin 51 is formed, as shown in FIG. 7, the thin plate 50, particularly the periphery of the pin 51, is deformed and becomes a factor of deteriorating the flatness. Even if such deformation is corrected by flat pressing or the like, since it changes over time due to the stress applied during the formation, it is necessary to perform another treatment such as heat treatment to prevent the deformation.
[0004]
As a method of forming a pin having a necessary and sufficient height in a thin plate, a method is generally employed in which the pin is fixed by press-fitting into a hole formed in the thin plate. FIGS. 8A, 8B, and 8C show a fixing method. FIG. 8A shows a thin plate 60 for implanting a pin 61, in which a hole 60a having an inner diameter φ1 slightly smaller than the outer diameter of the pin 61 is formed. In a normal case, the processed thin plate 60 is subjected to surface treatment such as plating in addition to deburring by a chemical conversion treatment or the like in the next step. When plating the thin plate 60, oils and fats attached to the surface are removed to avoid peeling and the like, and a pretreatment such as a chemical conversion treatment is performed to obtain a surface roughness suitable for plating.
[0005]
However, since the erosion depth due to the chemical conversion treatment is substantially constant, the erosion with respect to the sheet thickness increases in the case of a thin sheet. Therefore, as shown in FIG. 8B, the inner diameter dimension φ2 of the hole 60a after processing is inevitably increased. In particular, since the opening portions near the upper and lower surfaces are eroded, the cross-sectional shape of the hole 60a is formed substantially in the shape of a drum. When the pin 61 is press-fitted into the hole 60a, sufficient pressure cannot be obtained because the hole diameter is large and the press-in allowance is small due to the thin plate, and the hole 60a is formed in a substantially drum shape. Therefore, the pin 61 may be detached from the thin plate 60, and the pin 61 may be inclined as shown in FIG. 8C.
[0006]
As a method of fixing a pin to a thin plate, a method by caulking is employed. In the method disclosed in Japanese Patent Application Laid-Open No. 2002-248531 (Patent Document 1), a polygonal hole 72 is formed at a position where a shaft 71 of a sheet metal 70 is joined, as shown in FIG. The tip of the step 71 a of the shaft 71 is inserted into the polygonal hole 72 so as to project from the polygonal hole 72. Next, the tip of the step portion 71a of the shaft 71 having a circular cross section is plastically deformed into a shape substantially the same as the polygonal hole 72 of the sheet metal 70 by using a punch having substantially the same shape as the polygonal hole 72. Close.
[0007]
The stepped portion 71a of the shaft 71 caulked in this way makes the hole side surface of the polygonal hole 72 in surface contact with the polygonal surface, thereby restricting the rotation of the shaft 71 and withstanding higher rotational torque. I have to.
[0008]
[Patent Document 1]
JP-A-2002-248531
[0009]
[Problems to be solved by the invention]
In the above-described method of fixing the pin to the thin plate by caulking, the tip of the step portion 71a of the shaft 71 is plastically deformed by using a punch having substantially the same shape as the polygonal hole 72 and caulked. A caulking portion 73 at the tip of the portion 71a protrudes. As a component of the device to be thinned, the protrusion of the caulking portion 73 becomes an obstacle. Further, when the outer diameter of the shaft 71 is set to a small diameter of 0.8 mm or less, it is difficult to form the stepped portion 71a. Furthermore, when caulking the step 71a having a small diameter, it is necessary to match the center of the punch and the step 71a with high precision, and even if a small dimension occurs, the caulking part 73 is deviated. There is a problem that decreases.
[0010]
In view of the above situation, the present invention provides a method of fixing a small diameter pin to a thin plate which can firmly fix a small diameter pin even if there is a variation in the inner diameter of a through hole formed in a thin thin plate. It is assumed that.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a method for fixing a small-diameter pin to a thin plate according to claim 1 of the present invention is characterized in that a through hole is formed in a thin plate such as a metal plate having plasticity, and one end of the pin is formed in the through hole. A protruding shaft fixing method of fitting and fixing by crimping, after fitting one end of a small diameter pin into the through hole, pressing the thin plate around the small diameter pin with a pressing tool in a plate thickness direction, It is characterized in that the thin plate is moved in the direction of one end of the small-diameter pin to be strongly pressed and fixed.
[0012]
According to the first aspect of the present invention, since the thin plate is caulked and fixed by moving the thin plate toward one end of the small-diameter pin, even if the inner diameter of the through hole formed in the thin plate varies, the small-diameter pin can be used. It can be firmly fixed. Further, since the small-diameter pin is fixed by the movement of the thin plate, even a pin having a small diameter of 0.8 mm or less can be easily caulked and fixed. Further, one end surface of the small-diameter pin can be made flush with the thin plate, and the thickness of the component can be reduced.
[0013]
The invention according to claim 2 of the present invention is characterized in that the thin plate has a thickness of 0.6 mm or less, and the small-diameter pin has an outer diameter of 0.8 mm or less.
[0014]
According to the invention as set forth in claim 2, even if a small-diameter pin having an outer diameter of 0.8 mm or less is attached to a thin plate having a thickness of 0.6 mm or less, the small-diameter pin is moved by moving the thickness of the thin plate. Since they are fixed, they can be easily caulked and fixed.
[0015]
Further, the invention according to claim 3 of the present invention is characterized in that the thin plate is provided with a chemical conversion treatment or plating in the thin plate or the through hole after the through hole is formed by a punch.
[0016]
According to the third aspect of the present invention, the inner diameter of the thin plate or the through hole greatly varies due to the chemical conversion treatment or the plating, but the pin is fixed by the movement of the thin plate. It can be absorbed, and the small diameter pin can be caulked and fixed depending on the required strength.
[0017]
Further, the invention according to claim 4 of the present invention is characterized in that the pressing tool allows the insertion of the small-diameter pin and a fitting hole having a depth shorter than the length of the small-diameter pin by a thickness of the thin plate, A holding tool having a pressing portion protruding around the fitting hole, and a pressing punch for pressing the thin plate in the pressing portion direction, wherein the small-diameter pin is inserted into the fitting hole and the through hole is formed. After being inserted into one end of the small-diameter pin and placing one surface of the thin plate on the pressing portion, a pressing punch having a flat front end surface from the other surface of the thin plate is pressed, and the pressing portion forms the through hole. The method is characterized in that the periphery of the thin plate is moved toward one end of the small-diameter pin by pressing the periphery.
[0018]
According to the invention described in claim 4, the small-diameter pin is inserted into the fitting hole of the holder to be fixed, and from this state, the thickness of the thin plate is moved in the direction of the small-diameter pin by the pressing portion of the holder. Since the pin is fixed, even if the small-diameter pin has a small diameter of 0.8 mm or less, the pin can be accurately caulked and fixed by inserting it into the fitting hole of the holder. Further, since the pressing portion is formed so as to protrude around the fitting hole formed in the holder, the position of the pin and the caulking portion becomes constant, and variations in caulking fixation can be eliminated.
[0019]
Furthermore, the invention according to claim 5 of the present invention provides a fitting hole having a depth that allows insertion of the small diameter pin and is shorter than the length of the small diameter pin by the thickness of the thin plate. A holding tool having a pressing portion protruding around the periphery thereof, and a pressing punch having a pressing portion protrudingly formed around the fitting hole, wherein the small-diameter pin is inserted into the fitting hole and After inserting the through hole into one end of the small-diameter pin and placing one surface of the thin plate on the holder, pressing the pressing punch from the other surface of the thin plate, and pressing the periphery of the through hole with the pressing portion. The method is characterized in that the thin plate is pressed to move the thin plate toward one end of the small-diameter pin.
[0020]
According to the fifth aspect of the present invention, the small-diameter pin is inserted into the fitting hole of the holder and fixed, and from this state, the thin plate is pressed by the pressing portion of the pressing punch to reduce the thickness of the thin plate in the small-diameter pin direction. Therefore, even if the outer diameter of the small-diameter pin is as small as 0.8 mm or less, the pin can be accurately caulked and fixed without being deformed by being inserted into the fitting hole of the holder.
[0021]
Further, the invention according to claim 6 of the present invention is characterized in that the pressing portion has a height in which the thickness of the thin plate is half or less, and is formed so as to protrude in an annular ridge shape centering on the small diameter pin, It is characterized in that it is formed in a substantially mortar shape with a tapered surface formed on the inner peripheral surface.
[0022]
According to the invention as set forth in claim 6, when the pressing portion projecting in the form of an annular ridge centering on the small diameter pin is formed in a substantially mortar shape having a tapered surface on the inner peripheral surface, the thin plate is pressed. When pressed, the wall moves in the direction of the small-diameter pin by the tapered surface, and the small-diameter pin can be more firmly fixed. At this time, even if the height of the pressing portion is less than half the thickness of the thin plate, the amount of the meat moving in the direction of the small-diameter pin is increased, so that a firm fixing can be achieved with a small pressing amount.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0023]
1 and 2 show a state in which a small-diameter pin 3 is fixed to a thin plate 1 by the method for fixing a small-diameter pin to a thin plate according to the present invention. The thin plate 1 made of a metal plate such as iron, stainless steel, copper, or brass has a thin plate thickness of 0.6 mm or less. The base end side of the cylindrical small-diameter pin 3 made of a metal material such as iron, stainless steel, copper, or brass having an outer diameter of 0.8 mm or less is formed in the through hole 2 formed in the thin plate 1 by a punch or the like. It is integrally fixed by the fixing method. A recess 4 is formed near the outer periphery of the thin plate 1.
[0024]
As shown in FIG. 2, the surface of the thin plate 1 and the small-diameter pin 3 are subjected to a chemical treatment and a surface treatment such as plating to form treatment layers 5 and 6 indicated by dotted lines. The chemical conversion treatment is performed as a pretreatment for performing a surface treatment such as plating. In order to prevent separation of the surface of the thin plate 1 from the plating layer, foreign substances adhering to the surface are removed, and a surface having a predetermined roughness is removed. This is a process for finishing to a roughness, and is a process usually performed on this kind of metal part. After the chemical conversion treatment, a surface treatment such as plating, rust prevention treatment, or painting is performed. Such a surface treatment is performed after the thin plate 1 and the small-diameter pin 3 are processed, and therefore, the inside of the through hole 2 of the thin plate 1 is also subjected to the surface treatment.
[0025]
Since the inner diameter of the through-hole 2 for fixing the small-diameter pin 3 having a diameter of 0.8 mm or less is approximately 0.8 mm or less, the central portion in the plate thickness direction is difficult to be processed. As a result, the through hole 2 has a large inner diameter on the surface side, the inner diameter decreases toward the center, the cross-sectional shape is formed substantially in the shape of a drum, and the surface treatment is not necessarily constant. Greatly varies. On the other hand, when the small-diameter pin 3 also has a small diameter and is subjected to a surface treatment, the outer diameter dimension varies as in the case of the thin plate 1.
[0026]
Next, a method of caulking a small-diameter pin 3 having an outer diameter with a large variation to the through hole 2 having an inner diameter with a large variation in the thin plate 1 will be described with reference to FIG.
[0027]
In FIG. 3, a pressing tool 10 for caulking and fixing the small diameter pin 3 to the thin plate 1 is in contact with a holding tool 11 having a fitting hole 11 a for positioning and fixing the small diameter pin 3, and a bottom surface of the holding tool 11. It comprises a closing plate 12 provided so as to close the fitting hole 11a by pressing, and a pressing punch 13 having a flat front end surface for pressing the thin plate 1 from the upper surface side of the holder 11.
[0028]
A pressing portion 14 is formed so as to protrude around a fitting hole 11 a formed in the holder 11. The pressing portion 14 is integrally formed in an annular shape so as to surround the fitting hole 11 a, and the height and the thickness from the upper surface of the holder 11 are approximately か ら to 分 の of the thickness of the thin plate 1. It is set to about 1. Therefore, the axial dimension of the fitting hole 11a becomes larger than the thickness of the holder 11 due to the protruding formation of the pressing portion 14. The height of the holder 11 is set to a size obtained by subtracting the thickness of the thin plate 1 from the length of the small diameter pin 3. The upper surface of the holder 11 is formed flat except for the pressing portion 14.
[0029]
3A, the small-diameter pin 3 is inserted into the fitting hole 11a of the holder 11 as shown in FIG. 3A, and the small-diameter pin is inserted into the holder 11 as shown in FIG. The other end of the pin 3 is brought into contact with the closing plate 12, and one end of the small-diameter pin 3 projects from the upper surface side of the holder 11. At this time, the projecting dimension of the small diameter pin 3 is substantially equal to the thickness of the thin plate 1. Next, as shown in FIG. 3B, the through hole 2 of the thin plate 1 is inserted into one end of the small diameter pin 3, and the periphery of the through hole 2 is placed on the upper surface of the pressing portion 14. Then, by pressing the other surface of the thin plate 1 with the pressing punch 13, the periphery of the through hole 2 of the thin plate 1 is crushed by the pressing portion 14, and the recess 4 is formed as shown in FIG. The meat of the recess 4 moves toward one end of the small-diameter pin 3. As a result, one end of the small-diameter pin 3 is strongly pressed by the thin plate 1 and firmly caulked.
[0030]
When the pressing punch 13 is pressed, the distal end surface of the pressing punch 13 comes into contact with one end surface of the small-diameter pin 3 and one surface of the thin plate 1 is surface-bonded to the upper surface of the holder 11. As a result, the movement of the pressing punch 13 is restricted, so that the small-diameter pin 3 can be caulked and fixed by an appropriate amount of movement of the meat. In addition, since the thin plate 1 is pressed flat between the distal end surface of the pressing punch 13 and the upper surface of the holder 11, the flatness of the thin plate 1 can be improved.
[0031]
As described above, according to the embodiment shown in FIG. 3, the small-diameter pin 3 fitted in the through hole 2 of the thin plate 1 is caulked and fixed by moving the thickness of the thin plate 1 toward one end of the small-diameter pin 3. Therefore, even if the inner diameter of the through hole 2 varies or the outer diameter of the small diameter pin 3 varies, the small diameter pin 3 can be firmly fixed by caulking. In addition, even if the pin 3 has an outer diameter of 0.8 mm or less, the pin 3 is not plastically deformed, so that it can be easily caulked and fixed. In addition, since the small-diameter pin 3 is caulked and fixed while being inserted into the fitting hole 11a of the holder 10, high-precision caulking can be realized. Further, since the pressing portion 14 is formed so as to protrude around the fitting hole 11a, the position at which the small diameter pin 3 is caulked and fixed is constant, and variations are eliminated.
[0032]
In the above-described embodiment, the pressing portion 14 formed to protrude around the fitting hole 11a of the holder 11 is integrally formed in an annular shape so as to surround the fitting hole 11a as shown in FIG. As shown in FIG. 4B, a plurality of pressing protrusions may be arranged in a ring. That is, the plurality of pressing projections 15 are arranged at equal angular intervals so as to surround the periphery of the fitting hole 11a of the holder 11. Similarly to the above-described pressing portion 14, the height and the thickness of the pressing protrusion 15 from the upper surface of the holder 11 are set to about 2 to 分 の of the thickness of the thin plate 1. ing.
[0033]
As described above, after the small-diameter pin 3 is inserted into the fitting hole 11a of the holding tool 11 and held in the holding tool 11 on which the plurality of pressing protrusions 15 are formed, the holding tool 11 The through-hole 2 of the thin plate 1 is inserted into one end of the small-diameter pin 3 protruding toward the upper surface of the thin plate 1, and the periphery of the through-hole 2 is placed on the upper surface of the pressing portion 14. Then, by pressing the other surface of the thin plate 1 with the pressing punch 13, the periphery of the through hole 2 of the thin plate 1 is crushed by the pressing protrusion 15, and the thickness of the thin plate 1 is moved toward one end of the small diameter pin 3. One end of the small-diameter pin 3 is strongly pressed by the movement of the meat of the thin plate 1 and is firmly fixed by caulking.
[0034]
At this time, the thickness of the thin plate 1 moved by the plurality of pressing protrusions 15 is smaller than that of the pressing portion 14 of the above-described embodiment, but the inner diameter of the through hole 2 of the thin plate 1 and the outer diameter of the small diameter pin 3 are reduced. When the precision of the thin plate 1 is relatively good, the amount of movement of the thin plate 1 may be small. Therefore, it is preferable to employ a plurality of pressing projections 15 according to the variation in the dimensional accuracy. Although the number of the pressing projections 15 can be set as appropriate, it is preferable that the pressing projections 15 are arranged at an equal angle in order to keep the strength of the caulking fixed over the entire circumference of the small diameter pin 3.
[0035]
FIG. 5 shows a second embodiment of the present invention, in which a pressing portion is formed so as to project from a pressing punch. A pressing tool 20 for caulking and fixing the small-diameter pin 3 to the thin plate 1 forms a fitting hole 21a for positioning and fixing the small-diameter pin 3, and also has a holding tool 21 having a flat upper surface and a bottom face of the holding tool 21. The holding plate 21 is configured to close the fitting hole 21 a by contacting the holding plate 21, and a pressing punch 23 pressing the thin plate 1 from the upper surface side of the holder 21.
[0036]
A pressing portion 24 is formed on the distal end surface of the pressing punch 23 so as to protrude from the fitting hole 21 a formed in the holder 21 so that the axial center of the pressing portion 24 is aligned with the fitting hole 21 a. The pressing portion 24 is integrally formed in an annular shape so as to surround the fitting hole 21 a when the pressing punch 23 is lowered, and the height and the thickness from the upper surface of the holder 11 are equal to the thickness of the thin plate 1. It is set to about one-half to one-fourth. Further, the height of the holder 21 is set to a size obtained by subtracting the thickness of the thin plate 1 from the length of the small diameter pin 3. The distal end surface of the pressing punch 23 is formed flat except for the pressing portion 24.
[0037]
Next, a method of caulking one end of the small-diameter pin 3 to the small-diameter pin 3 through hole 2 of the thin plate 1 using the pressing tool 20 configured as described above will be described. First, as shown in FIG. 5A, the small-diameter pin 3 is inserted into the fitting hole 21a of the holder 21 and the other end of the small-diameter pin 3 is brought into contact with the closing plate 22. One end of the small-diameter pin 3 is projected from the Further, the through hole 2 of the thin plate 1 is inserted into one end of the small diameter pin 3, and the thin plate 1 is placed on the upper surface of the holder 11. At this time, since the projecting dimension of the small diameter pin 3 is substantially equal to the thickness of the thin plate 1, the end face of the small diameter pin 3 and the thin plate 1 are formed on the same plane. Thereafter, as shown in FIG. 5 (B), by pressing the other surface of the thin plate 1 with the pressing punch 23, the periphery of the through hole 2 of the thin plate 1 is crushed by the pressing portion 24 formed to project from the pressing punch 23, The flesh of the thin plate 1 moves toward one end of the small diameter pin 3. As a result, one end of the small-diameter pin 3 is strongly pressed by the moved meat and firmly fixed.
[0038]
As described above, according to the second embodiment shown in FIG. 5, similarly to the above-described embodiment, even if the pin 3 has an outer diameter of 0.8 mm or less, the thin plate 1 can be transparent. The small-diameter pin 3 fitted in the hole 2 is fixed by caulking by moving the thickness of the thin plate 1 toward one end of the small-diameter pin 3, so that the inner diameter of the through-hole 2 varies, or the outer diameter of the small-diameter pin 3. Even if there is a variation in the diameter, the small-diameter pin 3 can be firmly fixed without being plastically deformed. In addition, the pressing portion 24 of the pressing punch 23 is pressed against the thin plate 1 from the back side to form a recess, and the meat is moved and fixed in the direction of the small-diameter pin 3. Since the surface side of 1 is formed flat, it is possible to prevent the appearance from being impaired. In the second embodiment, as shown in FIG. 4B, a plurality of pressing protrusions may be arranged in a ring shape in the pressing portion 24 protruding from the pressing punch 23 as shown in FIG.
[0039]
FIG. 6 shows a modification of the pressing portion. Hereinafter, this example will be described based on the above-described first embodiment. The pressing portion 30 formed around the fitting hole 11a of the holder 11 is integrally formed in an annular ridge shape so as to surround the fitting hole 11a, and the inner peripheral surface is tapered so as to become lower toward the center. 31 is formed in a substantially mortar shape. The height of the pressing portion 30 is set to be less than half the thickness of the thin plate 1. Further, the upper surface side of the holder 11 is formed flat except for the pressing portion 30.
[0040]
The small-diameter pin 3 is inserted into the fitting hole 11a of the holding tool 11 and the other end thereof is brought into contact with the closing plate 12 with respect to the holding tool 11 configured as described above. 3. One end of 3 is projected. Next, the through hole 2 of the thin plate 1 is inserted into one end of the small diameter pin 3, and the periphery of the through hole 2 is placed on the upper surface of the pressing portion 30. Then, by pressing the other surface of the thin plate 1 with the pressing punch 13, the periphery of the through hole 2 of the thin plate 1 is crushed by the pressing portion 30, and the meat of the thin plate 1 moves toward one end of the small diameter pin 3. When the pressing punch 13 is pressed, the thickness of the thin plate 1 is intensively directed in the direction of the small-diameter pin 3 as indicated by an arrow by the tapered surface 31 formed on the inner peripheral surface of the pressing portion 30. As a result, more meat moves in the direction of the small-diameter pin 3 than the above-described pressing portion, and one end of the small-diameter pin 3 is strongly pressed by the movement of the thin plate 1 and firmly caulked.
[0041]
As described above, since the tapered surface 31 is formed on the inner peripheral surface of the pressing portion 30, the amount of movement of the thin plate 1 to be moved in one end direction of the small-diameter pin 3 is increased. Even if it is set lower than the pressing portion of the embodiment, the small diameter pin 3 can be firmly caulked and fixed. Therefore, even if the original thickness is small, as in the case of the thin plate 1 having a thickness of 0.3 mm or less, the small-diameter pin can be provided with necessary and sufficient strength by increasing the amount of movement of the thickness by the tapered surface 31. 3 can be caulked and fixed. Further, since the pressing depth and pressing force of the pressing portion 30 can be reduced, the stress applied to the thin plate 1 can be reduced, so that the deformation of the thin plate 1 can be reduced, and the small diameter pin 3 is caulked and fixed with high precision. can do.
[0042]
It goes without saying that the present invention is not limited to the embodiments described above, but can be variously modified without departing from the present invention. For example, the small-diameter pin 3 to be caulked and fixed to the through hole 2 of the thin plate 1 may be not only a columnar shape but also a prismatic shape, a truncated cone shape, or a truncated pyramid shape. It may be changed to a conical shape or the like. Furthermore, the surface where the holding tool 11 and the pressing punch 13 face each other is formed as a flat surface, but when the small diameter pin 3 is caulked and fixed, the holding tool 11 and the holding tool 11 are simultaneously bent and drawn or cut. The surface facing the pressing punch 13 may be adapted to various types of processing.
[0043]
【The invention's effect】
According to the present invention described above, in the method for fixing a small-diameter pin to a thin plate according to the first aspect of the present invention, the small-diameter pin fitted into the through hole formed in the thin plate is moved in the direction of one end of the pin. Since it is swaged and fixed by moving, even if the inner diameter of the through hole formed in the thin plate or the outer diameter of the small diameter pin varies, it can be firmly fixed. Even if the small diameter pin has an outer diameter of 0.8 mm or less, the small diameter pin can be easily caulked and fixed without plastic deformation. Further, one end face of the pin can be made flush with the thin plate, and the thickness of the component can be reduced.
[0044]
According to the method for fixing a small-diameter pin to a thin plate according to claim 2, even if the thickness of the thin plate is 0.6 mm or less and the outer diameter of the small-diameter pin is 0.8 mm or less, the thickness of the thin plate is reduced. Since the pin is fixed by the movement, the pin can be easily caulked.
[0045]
Furthermore, according to the method for fixing a small diameter pin to a thin plate according to the third aspect, even if there is a large variation in the inner diameter in the through hole of the thin plate due to chemical conversion treatment or plating, the pin is fixed by moving the thickness of the thin plate. Therefore, variations in the inner diameter of the through-hole can be absorbed, and a pin having a small diameter can be caulked and fixed with necessary strength.
[0046]
According to the method for fixing a small-diameter pin to a thin plate according to claim 4, the pin is fixed by inserting the pin into the fitting hole of the holder, so that the outer diameter of the pin is 0.8 mm or less. Even with a small diameter, it can be caulked and fixed with high accuracy. Further, since the pressing portion is formed so as to protrude around the fitting hole formed in the holder, the positions of the pin and the caulking portion are fixed, and variations in caulking fixation can be eliminated.
[0047]
Furthermore, according to the method of fixing a small diameter pin to a thin plate according to claim 5, the pin is fixed by inserting the pin into the fitting hole of the holder, and from this state, the thin plate is pressed by the pressing portion of the pressing punch. Pressing to form a recess in the thin plate and moving the meat in the pin direction to fix it, so even if the outer diameter of the pin is as small as 0.8 mm or less, by inserting it into the fitting hole of the holder It is possible to caulk and fix it accurately without deformation.
[0048]
According to the method for fixing a small-diameter pin to a thin plate according to claim 6, when the pressing portion is formed in a substantially mortar shape having a tapered surface formed on the inner peripheral surface, when the thin plate is pressed by the pressing portion, The tapered surface increases the amount of movement of the meat in the direction of the small-diameter pin, so that it is possible to firmly adhere even with a small pressing amount.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of a method for fixing a small diameter pin to a thin plate according to the present invention.
FIG. 2 is a cross-sectional view showing a small-diameter pin fixed to a thin plate by the method for fixing a small-diameter pin to the thin plate according to the present invention.
FIGS. 3 (A) to 3 (C) are process explanatory views showing steps of a method for fixing a small diameter pin to a thin plate according to the present invention.
FIGS. 4A and 4B are plan views of a main part showing an example of a pressing portion according to the present invention.
FIGS. 5A and 5B are process explanatory views showing a second embodiment of the method for fixing a small diameter pin to a thin plate according to the present invention.
FIG. 6 is a cross-sectional view showing a modification of the pressing portion in the method of fixing a small diameter pin to a thin plate according to the present invention.
FIG. 7 is a sectional view showing a state in which pins are formed on a thin plate by a conventional method.
FIGS. 8A to 8C are explanatory views showing a conventional method of fixing a pin to a thin plate.
FIGS. 9A and 9B are a perspective view and a sectional view showing a conventional method of forming a pin on a thin plate by caulking.
[Explanation of symbols]
1 Thin plate
2 through-hole
3 small diameter pin
4 recess
10 Press tool
11 Holder
11a Mating hole
12 Closure plate
13 Press punch
14 Pressing part
30 pressing part
31 Tapered surface

Claims (6)

可塑性を有する金属板等の薄板に透孔が形成され、この透孔にピンの一端を嵌合すると共にかしめにより固着する突軸固着方法であって、
上記透孔に小径ピンの一端を嵌合した後、押圧具により上記小径ピンの周囲の上記薄板を板厚方向に押圧し、上記薄板の肉を上記小径ピンの一端方向に移動させることにより強圧してかしめ固着することを特徴とする薄板への小径ピンの固着方法。
A through hole is formed in a thin plate such as a metal plate having plasticity.
After fitting one end of the small-diameter pin into the through-hole, the thin plate around the small-diameter pin is pressed in the thickness direction by a pressing tool, and the thin plate is moved in the direction of one end of the small-diameter pin to generate high pressure. A method of fixing a small-diameter pin to a thin plate, wherein the pin is fixed by caulking.
上記薄板は板厚が0.6mm以下であり、上記小径ピンの外径寸法が0.8mm以下である請求項1に記載の薄板への小径ピンの固着方法。The method for fixing a small-diameter pin to a thin plate according to claim 1, wherein the thin plate has a thickness of 0.6 mm or less, and an outer diameter of the small-diameter pin is 0.8 mm or less. 上記薄板は、ポンチによって上記透孔を穿設した後、上記薄板や上記透孔内に化成処理もしくはメッキを施した請求項1および2に記載の薄板への小径ピンの固着方法。The method for fixing a small diameter pin to a thin plate according to claim 1 or 2, wherein the thin plate is formed by forming a through hole with a punch and then forming or plating the thin plate and the through hole. 上記押圧具は、上記小径ピンの挿入を許容すると共に上記小径ピンの長さより上記薄板の板厚分だけ短い深さの嵌合穴と、この嵌合穴の周囲に突出形成した押圧部とを有する保持具と、上記薄板を押圧部方向に押圧する押圧パンチからなり、上記小径ピンを上記嵌合穴に挿入すると共に上記透孔を上記小径ピンの一端に挿入して上記薄板の一方面を上記押圧部に載置した後、上記薄板の他方面から先端面を平坦に形成した押圧パンチを押圧し、上記押圧部により上記透孔の周囲を押圧して上記薄板の肉を上記小径ピンの一端方向に移動させる請求項1乃至3に記載の薄板への小径ピンの固着方法。The pressing tool allows the insertion of the small-diameter pin and a fitting hole having a depth shorter than the length of the small-diameter pin by the thickness of the thin plate, and a pressing portion formed to protrude around the fitting hole. A holding tool having a pressing punch for pressing the thin plate in a pressing portion direction, inserting the small-diameter pin into the fitting hole and inserting the through-hole into one end of the small-diameter pin, and pressing one side of the thin plate. After being placed on the pressing portion, the other end of the thin plate is pressed against a pressing punch formed with a flat front end surface, and the pressing portion presses the periphery of the through hole to reduce the thickness of the thin plate with the small diameter pin. 4. The method for fixing a small diameter pin to a thin plate according to claim 1, wherein the pin is moved in one end direction. 上記押圧具は、上記小径ピンの挿入を許容すると共に上記小径ピンの長さより上記薄板の板厚分だけ短い深さの嵌合穴と、この嵌合穴の周囲に突出形成した押圧部とを有する保持具と、上記嵌合穴の周囲に対向させて突出形成した押圧部を有する押圧パンチからなり、上記小径ピンを上記嵌合穴に挿入すると共に上記透孔を上記小径ピンの一端に挿入して上記薄板の一方面を上記保持具に載置した後、上記薄板の他方面から上記押圧パンチを押圧し、上記押圧部により上記透孔の周囲を押圧して上記薄板の肉を上記小径ピンの一端方向に移動させる請求項1乃至3に記載の薄板への小径ピンの固着方法。The pressing tool allows the insertion of the small-diameter pin and a fitting hole having a depth shorter than the length of the small-diameter pin by the thickness of the thin plate, and a pressing portion formed to protrude around the fitting hole. And a pressing punch having a pressing portion formed to protrude so as to face the periphery of the fitting hole. The small diameter pin is inserted into the fitting hole and the through hole is inserted into one end of the small diameter pin. Then, after placing one surface of the thin plate on the holder, pressing the pressing punch from the other surface of the thin plate, pressing the periphery of the through hole with the pressing portion to reduce the thickness of the thin plate to the small diameter 4. The method according to claim 1, wherein the pin is moved toward one end of the pin. 上記押圧部は、上記薄板の板厚が半分以下の高さを有し、上記小径ピンを中心とした環状の突堤状に突出形成され、内周面にテーパ面を形成した略擂り鉢状に形成した請求項1乃至5に記載の薄板への小径ピンの固着方法。The pressing portion has a height in which the thickness of the thin plate is less than half, is formed to project in an annular ridge shape centering on the small-diameter pin, and has a substantially mortar shape with a tapered surface formed on an inner peripheral surface. The method for fixing a small-diameter pin to a thin plate according to any one of claims 1 to 5, which is formed.
JP2002362473A 2002-12-13 2002-12-13 Method for fixing small-diameter pin to sheet Pending JP2004188484A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103223444A (en) * 2012-01-26 2013-07-31 先技精工(日本)有限公司 Method for manufacturing a caulked assembly
JPWO2018073958A1 (en) * 2016-10-21 2018-12-27 三菱電機株式会社 Caulking structure, caulking assembly and caulking method
JP2022117259A (en) * 2021-01-29 2022-08-10 ダイハツ工業株式会社 Caulking joining structure and caulking joining method
JP7496665B2 (en) 2021-09-21 2024-06-07 ダイハツ工業株式会社 Crimping device and crimping method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103223444A (en) * 2012-01-26 2013-07-31 先技精工(日本)有限公司 Method for manufacturing a caulked assembly
JPWO2018073958A1 (en) * 2016-10-21 2018-12-27 三菱電機株式会社 Caulking structure, caulking assembly and caulking method
JP2022117259A (en) * 2021-01-29 2022-08-10 ダイハツ工業株式会社 Caulking joining structure and caulking joining method
JP7246838B2 (en) 2021-01-29 2023-03-28 ダイハツ工業株式会社 Caulking joint structure and caulking joint method
JP7496665B2 (en) 2021-09-21 2024-06-07 ダイハツ工業株式会社 Crimping device and crimping method

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