JPH0923622A - Rotor for electronic clock and manufacture thereof - Google Patents

Rotor for electronic clock and manufacture thereof

Info

Publication number
JPH0923622A
JPH0923622A JP7170536A JP17053695A JPH0923622A JP H0923622 A JPH0923622 A JP H0923622A JP 7170536 A JP7170536 A JP 7170536A JP 17053695 A JP17053695 A JP 17053695A JP H0923622 A JPH0923622 A JP H0923622A
Authority
JP
Japan
Prior art keywords
rotor
magnet
rotor shaft
rotor magnet
solder
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
JP7170536A
Other languages
Japanese (ja)
Inventor
Hiroshi Ikeda
浩 池田
Atsushi Satou
佐藤  惇司
庸介 ▲榊▼原
Yasusuke Sakakibara
Yoshimasa Shirai
芳昌 白井
Satoshi Okada
聰 岡田
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.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co Ltd
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 Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Priority to JP7170536A priority Critical patent/JPH0923622A/en
Publication of JPH0923622A publication Critical patent/JPH0923622A/en
Pending legal-status Critical Current

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  • Electromechanical Clocks (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

PROBLEM TO BE SOLVED: To make possible to employ solder bonding in the production of bond magnet by subjecting a metal plated film to solder plating such that the outside diameter of rotor shaft is smaller than the inside diameter of a rotor magnet, press fitting the rotor shaft in the rotor magnet and then thermally bonding the rotor magnet and rotor shaft. SOLUTION: A metal plating film 2 is formed on the inner circumferential surface of a tubular rotor magnet 1 comprising a tubular rare earth bond magnet having central hollow section. A solder plating layer 5 is then formed on the metal plating film 2 such that the outside diameter (x) of a rotor shaft 3 is smaller than the inside diameter (y) of the rotor magnet 1. Subsequently, the rotor shaft 3 is press fitted in the rotor magnet 1 and heated to bond the rotor shaft 3 and the rotor magnet 1. Since solder bonding can be employed in a resin bond magnet, the workability can be enhanced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は電子時計に用いられる変
換器のロータの製造方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rotor of a converter used in an electronic timepiece.

【0002】[0002]

【従来の技術】円筒形のロータ磁石とロータ軸とをハン
ダメッキを介して接合することは特公昭57−5277
9に提案されている。そのなかの一例を図3により説明
する。図3は従来例の電子時計用ロータの断面図であ
る。図3において11はロータ磁石、12は金属メッキ
皮膜、13はロータ軸、14は座金、15はハンダであ
る。ロータ磁石11の表面には無電解化学メッキ等で金
属メッキ皮膜12が作られている。またロータ軸13に
はカナ13aが一体で成形されている。そしてロータ軸
13はあらかじめ座金14に圧入されている。そして座
金14と金属メッキ皮膜12をハンダ15で溶着するこ
とによってロータ磁石11とロータ軸13は固着され、
ロータが製造される。
2. Description of the Related Art Joining a cylindrical rotor magnet and a rotor shaft through solder plating is disclosed in Japanese Patent Publication No. 57-5277.
9 have been proposed. One example thereof will be described with reference to FIG. FIG. 3 is a sectional view of a conventional rotor for an electronic timepiece. In FIG. 3, 11 is a rotor magnet, 12 is a metal plating film, 13 is a rotor shaft, 14 is a washer, and 15 is a solder. A metal plating film 12 is formed on the surface of the rotor magnet 11 by electroless chemical plating or the like. Further, the rotor shaft 13 is integrally formed with a pinion 13a. The rotor shaft 13 is press fitted into the washer 14 in advance. Then, the washer 14 and the metal plating film 12 are welded by the solder 15 to fix the rotor magnet 11 and the rotor shaft 13 to each other.
The rotor is manufactured.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、ロータ
磁石が耐熱性に問題のない燒結磁石であれば、ハンダ接
合のために加熱処理することは特に問題はないが、作業
性に優れているこのハンダメッキ接合技術を、結合剤と
して樹脂が含まれているボンド磁石に適用する場合に
は、樹脂の耐熱性との関係で加熱温度が制約される。
However, if the rotor magnet is a sintered magnet having no problem in heat resistance, heat treatment for soldering is not a problem, but this solder is excellent in workability. When the plating joining technique is applied to a bonded magnet containing a resin as a binder, the heating temperature is restricted due to the heat resistance of the resin.

【0004】本発明は、上記課題を解決し、ボンド磁石
にハンダ接合が採用できる電子時計用ロータの製造方法
およびその方法により製造されるロータを提供すること
を目的とする。
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a method of manufacturing a rotor for an electronic timepiece in which solder bonding can be adopted for a bond magnet, and a rotor manufactured by the method.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明では、中心部に中空部を有し、希土類ボンド
磁石である円筒形のロータ磁石と、カナと軸とを一体に
成形したロータ軸とを接合する方法において、ロータ磁
石の少なくとも内周面に金属メッキ皮膜を形成し、この
金属メッキ皮膜上に、ロータ軸の外径(x)よりロータ
磁石の内径(y)の方が小さくなるようにハンダメッキ
を施し、その後ロータ磁石にロータ軸を圧入し、加熱す
ることによりロータ磁石とロータ軸とを接合することを
特徴としている。すなわち、ロータ磁石の内周面におい
てロータ軸とハンダメッキ接合をする。
In order to achieve the above object, in the present invention, a cylindrical rotor magnet, which is a rare earth bonded magnet, having a hollow portion at its center, and a kana and a shaft are integrally formed. In the method of joining the rotor shaft to the rotor magnet, a metal plating film is formed on at least the inner peripheral surface of the rotor magnet, and the inner diameter (y) of the rotor magnet is formed on the metal plating film rather than the outer diameter (x) of the rotor shaft. It is characterized in that the rotor magnet and the rotor shaft are joined by performing solder plating so that the value becomes smaller, and then pressing the rotor shaft into the rotor magnet and heating. That is, the inner circumference of the rotor magnet is solder-plated to the rotor shaft.

【0006】[0006]

【作用】本発明によると、少なくとも内周面にハンダメ
ッキを施したロータ磁石をロータ軸に圧入すると、樹脂
ボンド磁石が弾性変形してハンダメッキ層に大きな圧力
が加わる。そのためにハンダメッキ層の溶融温度が降下
して、比較的低い加熱温度で接合することができる。こ
れは結合剤として樹脂を含んだボンド磁石に特有の効果
であり、ほとんど弾性変形しない燒結磁石においては認
められないものである。本発明はこのような知見に基づ
いてなされたものである。
According to the present invention, when a rotor magnet having at least its inner peripheral surface plated with solder is press-fitted into the rotor shaft, the resin bond magnet is elastically deformed and a large pressure is applied to the solder plating layer. Therefore, the melting temperature of the solder plating layer is lowered, and the soldering layer can be joined at a relatively low heating temperature. This is an effect peculiar to a bonded magnet containing a resin as a binder, and is not recognized in a sintered magnet that hardly elastically deforms. The present invention has been made based on such findings.

【0007】[0007]

【実施例】以下本発明を実施例により説明する。図1は
本発明の実施例の電子時計用ロータを示す断面図であ
る。(a)にロータ軸と接合後の電子時計用ロータを、
(b)に接合前のハンダメッキを施した後のロータ磁石
を示している。図1において、1は希土類永久磁石と結
合剤として樹脂とを使用した希土類ボンド磁石のロータ
磁石、2は金属メッキ皮膜、3はロータ軸、5はハンダ
メッキ層である。ロータ磁石の表面には無電解化学メッ
キ等で金属メッキ皮膜2が作られている。この金属メッ
キ皮膜2は、ハンダメッキとの密着性および希土類ボン
ド磁石との密着性が良ければ、いかなる種類の金属メッ
キの使用が可能であるが、ピンホールを防ぐため、金属
メッキ皮膜の総厚を3μm以上とすることが好ましい。
本実施例ではハンダメッキと相性の良いNi−B、Ni
−Pの二層構造を金属メッキ皮膜として使用した。その
後、ロータ磁石とロータ軸が接合する部分にハンダメッ
キを施す。ロータ軸3にはカナ3aが一体で成形されて
いる。ロータ軸3は軸の外径xが、図1(b)接合前の
ロータ磁石の図で示しているように、ハンダメッキを施
した後のロータ磁石1の内径yよりも大きくなってい
る。すなわち、x>yなる関係になっている。そしてこ
のロータ軸3をロータ磁石1に圧入し、この状態で17
0℃に加熱する。すると、ハンダメッキ層5が溶融し、
ロータ磁石1の内周面において、ロータ磁石1とロータ
軸3が接合される。
The present invention will be described below with reference to examples. FIG. 1 is a sectional view showing a rotor for an electronic timepiece according to an embodiment of the present invention. (A) shows a rotor for an electronic timepiece after being joined to the rotor shaft,
(B) shows a rotor magnet after solder plating before joining. In FIG. 1, 1 is a rotor magnet of a rare earth bonded magnet using a rare earth permanent magnet and a resin as a binder, 2 is a metal plating film, 3 is a rotor shaft, and 5 is a solder plating layer. A metal plating film 2 is formed on the surface of the rotor magnet by electroless chemical plating or the like. This metal plating film 2 can be used with any kind of metal plating as long as it has good adhesion to solder plating and adhesion to rare earth bonded magnets, but to prevent pinholes, the total thickness of the metal plating film 2 can be used. Is preferably 3 μm or more.
In this embodiment, Ni-B and Ni that are compatible with solder plating are used.
The -P two-layer structure was used as the metal plating film. After that, the portion where the rotor magnet and the rotor shaft are joined is plated with solder. The rotor shaft 3 is integrally formed with a pinion 3a. The outer diameter x of the rotor shaft 3 is larger than the inner diameter y of the rotor magnet 1 after solder plating, as shown in the diagram of the rotor magnet before joining in FIG. That is, there is a relation of x> y. Then, the rotor shaft 3 is press-fitted into the rotor magnet 1, and in this state 17
Heat to 0 ° C. Then, the solder plating layer 5 melts,
On the inner peripheral surface of the rotor magnet 1, the rotor magnet 1 and the rotor shaft 3 are joined.

【0008】本実施例で使用したハンダは通常のバルク
状態では約183℃の融点を示すが、ハンダメッキ層と
して円筒型磁石の内周面とロータ軸との界面に圧接状態
で介在させると、約170℃で融着することを見出し
た。これはメッキ組織の活性化状態と圧力の影響でハン
ダメッキ層の溶融温度が降下したものと考えられる。
The solder used in this example has a melting point of about 183 ° C. in a normal bulk state, but when it is interposed as a solder plating layer at the interface between the inner peripheral surface of the cylindrical magnet and the rotor shaft in a pressure contact state, It was found to fuse at about 170 ° C. It is considered that this is because the melting temperature of the solder plating layer dropped due to the activation state of the plating structure and the pressure.

【0009】図2は、本発明の他の実施例の電子時計用
ロータを示す断面図である。この場合のように、ロータ
磁石の全面に金属メッキ皮膜およびハンダメッキを施す
こともできる。この場合にも、接合する前のロータ磁石
の内径はロータ軸の外径より小さくなるようにハンダメ
ッキを施し、圧入し加熱した。
FIG. 2 is a sectional view showing a rotor for an electronic timepiece according to another embodiment of the present invention. As in this case, it is possible to apply a metal plating film and a solder plating to the entire surface of the rotor magnet. Also in this case, the rotor magnet before joining was plated with solder so that the inner diameter of the rotor magnet was smaller than the outer diameter of the rotor shaft.

【0010】[0010]

【発明の効果】上記のように本発明によれば、ボンド磁
石は燒結磁石と比べて寸法精度が良いので座金を用いず
にロータ磁石の内周面でロータ軸と接合できる。その結
果、電子時計用ロータ構造の簡略化が図れる。また、ボ
ンド磁石は弾性変形するので、ロータ軸を内周面にハン
ダメッキ層を有するロータ磁石に圧入すると、ハンダメ
ッキ層が加圧される。したがって、ハンダメッキ層の溶
融温度が降下するので、樹脂ボンドに許容される加熱温
度でもハンダ接合できる。これらより、樹脂ボンド磁石
にハンダ接合が採用できるようになり、作業性の向上が
得られる。
As described above, according to the present invention, since the bond magnet has better dimensional accuracy than the sintered magnet, it can be joined to the rotor shaft at the inner peripheral surface of the rotor magnet without using a washer. As a result, the rotor structure for an electronic timepiece can be simplified. Further, since the bond magnet is elastically deformed, when the rotor shaft is press-fitted into the rotor magnet having the solder plating layer on the inner peripheral surface, the solder plating layer is pressed. Therefore, since the melting temperature of the solder plating layer is lowered, the soldering can be performed even at the heating temperature allowed for the resin bonding. As a result, solder bonding can be adopted for the resin-bonded magnet, and workability can be improved.

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

【図1】本発明の実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.

【図2】本発明の他の実施例を示す断面図である。FIG. 2 is a sectional view showing another embodiment of the present invention.

【図3】従来例を示す断面図である。FIG. 3 is a sectional view showing a conventional example.

【符号の説明】[Explanation of symbols]

1 ロータ磁石 2 金属メッキ皮膜 3 ロータ軸 3a カナ 5 ハンダメッキ層 x ロータ軸の外径 y ロータ軸と接合する前のハンダメッキを施した後
のロータ磁石の内径 11 ロータ磁石 12 金属メッキ皮膜 13 ロータ軸 13a カナ 14 座金 15 ハンダ
1 rotor magnet 2 metal plating film 3 rotor shaft 3a kana 5 solder plating layer x outer diameter of rotor shaft y inner diameter of rotor magnet after solder plating before joining to rotor shaft 11 rotor magnet 12 metal plating film 13 rotor Axis 13a Cana 14 Washer 15 Solder

フロントページの続き (72)発明者 白井 芳昌 埼玉県所沢市大字下富字武野840番地 シ チズン時計株式会社技術研究所内 (72)発明者 岡田 聰 東京都田無市本町6丁目1番12号 シチズ ン時計株式会社田無製造所内Front Page Continuation (72) Inventor Yoshimasa Shirai 840 Takeno, Shimotomi, Tokorozawa, Saitama Prefecture, Research Institute of Citizen Watch Co., Ltd. Watch Co., Ltd. Tanashi Factory

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 中心部に中空部を有し、希土類ボンド磁
石からなる円筒形のロータ磁石と、カナと軸とを一体に
成形したロータ軸とを接合する方法であって、ロータ磁
石の少なくとも内周面に金属メッキ皮膜を形成し、この
金属メッキ皮膜上にロータ軸の外径(x)よりロータ磁
石の内径(y)の方が小さくなるように(x>y)ハン
ダメッキを施し、ハンダメッキ施行後、そのロータ磁石
にロータ軸を圧入し、加熱することによりロータ磁石と
ロータ軸とを接合することを特徴とする電子時計用ロー
タの製造方法。
1. A method of joining a cylindrical rotor magnet, which has a hollow portion in the center thereof and is made of a rare earth bonded magnet, and a rotor shaft formed by integrally forming a pin and a shaft, and at least the rotor magnet. A metal plating film is formed on the inner peripheral surface, and solder plating is applied on the metal plating film so that the inner diameter (y) of the rotor magnet is smaller than the outer diameter (x) of the rotor shaft (x> y). A method for manufacturing a rotor for an electronic timepiece, characterized in that, after solder plating is performed, the rotor shaft is press-fitted into the rotor magnet and heated to bond the rotor magnet and the rotor shaft together.
【請求項2】 請求項1記載の方法により製造される電
子時計用ロータ。
2. A rotor for an electronic timepiece manufactured by the method according to claim 1.
JP7170536A 1995-07-06 1995-07-06 Rotor for electronic clock and manufacture thereof Pending JPH0923622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7170536A JPH0923622A (en) 1995-07-06 1995-07-06 Rotor for electronic clock and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7170536A JPH0923622A (en) 1995-07-06 1995-07-06 Rotor for electronic clock and manufacture thereof

Publications (1)

Publication Number Publication Date
JPH0923622A true JPH0923622A (en) 1997-01-21

Family

ID=15906739

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7170536A Pending JPH0923622A (en) 1995-07-06 1995-07-06 Rotor for electronic clock and manufacture thereof

Country Status (1)

Country Link
JP (1) JPH0923622A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012215183A (en) * 2011-03-31 2012-11-08 Seiko Instruments Inc Mechanical part assembly, method of manufacturing the same, and timepiece
CN104269979A (en) * 2014-09-05 2015-01-07 宁波市展发磁业科技有限公司 Method for machining neodymium-iron-boron permanent magnet temperature compensation component for wind driven generator or permanent magnet motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012215183A (en) * 2011-03-31 2012-11-08 Seiko Instruments Inc Mechanical part assembly, method of manufacturing the same, and timepiece
CN104269979A (en) * 2014-09-05 2015-01-07 宁波市展发磁业科技有限公司 Method for machining neodymium-iron-boron permanent magnet temperature compensation component for wind driven generator or permanent magnet motor

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