JPH0673467A - Production of rivet-shaped composite contact element - Google Patents

Abstract

PURPOSE:To obtain a contact element sufficient in the joining strength between the head and foot without using a silver alloy as the foot by subjecting the head consisting of a silver alloy to cold press-joining with the foot consisting of an oxidation resistant copper allay and thereafter executing oxidation treatment. CONSTITUTION:At the time of producing the rivet-shaped composite contact element, the head consisting of a silver allay is subjected to cold press-joining with the foot consisting of a copper alloy. Next, postoxidation treatment is executed. By using the copper allay high in oxidation resistance compared to that of copper and free from scale out at the time of internal oxidation treatment as the foot, the use of expensive silver is eliminated. As the silver allay forming the head, the allay of Ag-Cd, Ag-Sn, Ag-Cd-Sn or the like is preferably used. As the copper alloy forming foot, the Cu-Cr allay having about 0.05 to 2wt% Cr content is preferably used. In this way, the stable contact element high in the joining strength between the head and foot can be obtd.

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、配線用遮断器、電磁接
触器、リレー等に使用されるリベット形接点素子の製造
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 rivet-type contact element used for a circuit breaker for wiring, an electromagnetic contactor, a relay and the like.

【０００２】[0002]

【従来の技術】この種リベット形複合接点素子の製造方
法として、前酸化法と後酸化法がある。前酸化法の製造
法として、Ａｇ合金の合金片（アトマイズ粉、合金板の
切粉、合金の細線等）を予め酸化した材料、またはＡｇ
−金属酸化物複合粉末を用いて成型、熱間押出し、線材
加工を行った材料を頭部に、Ｃｕ線材を足部にヘッダー
加工等により冷間圧接して成る接点素子があるが、前酸
化法の材料であるため、塑性加工性が悪く線材や、冷間
圧接時にクラックが発生したり、頭部と足部との接合が
不十分な場合がある。2. Description of the Related Art As a method of manufacturing this type of rivet type composite contact element, there are a pre-oxidation method and a post-oxidation method. As a manufacturing method of the pre-oxidation method, a material obtained by previously oxidizing Ag alloy alloy pieces (atomized powder, alloy plate swarf, alloy fine wire, etc.), or Ag
-There is a contact element formed by cold-welding a material obtained by molding, hot extruding, and wire-processing a metal oxide composite powder to the head, and a Cu wire to the foot by header processing or the like. Since it is a material of the method, the plastic workability is poor, and there are cases where a wire rod, cracks occur during cold pressure welding, or the joint between the head and the foot is insufficient.

【０００３】後酸化法の製造法としては、特開昭５０−
１１００６９号公報に示される様に、Ａｇ合金時に加
工、冷間圧接して最後に内部酸化を施す接点素子の製法
があるが、この接点素子の足部は高価なＡｇが用いられ
ている。この様に後酸化法による接点素子の足部は、Ｃ
ｕは用いられていない。これはＣｕは耐酸化性が不足し
ているためである。As a manufacturing method of the post-oxidation method, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 110069, there is a method of manufacturing a contact element which is processed at the time of Ag alloying, cold pressed, and finally internally oxidized. However, expensive foot is used for the foot portion of this contact element. In this way, the foot portion of the contact element by the post-oxidation method is C
u is not used. This is because Cu has insufficient oxidation resistance.

【０００４】[0004]

【発明が解決しようとする課題】解決しようとする問題
点は、頭部と足部の十分な接合が得られる複合接点素子
の後酸化法による製造法に於いて、足部の素材として高
価なＡｇ又はＡｇ合金を用いなければならないという点
である。The problem to be solved is that in the manufacturing method by the post-oxidation method of the composite contact element which can sufficiently bond the head and the foot, it is expensive as a material for the foot. The point is that Ag or Ag alloy must be used.

【０００５】[0005]

【課題を解決するための手段】本発明は、リベット形複
合接点素子の製造に際し、銀合金より成る頭部に、銅合
金より成る足部を冷間圧接し、次いで後酸化処理を行う
ことを特徴としている。この様に足部にＣｕよりも耐酸
化性が高く、内部酸化処理時にスケールアウトしないＣ
ｕ合金を用いることによって高価なＡｇを使わないとい
う目的を達成した。According to the present invention, in manufacturing a rivet-type composite contact element, a head made of a silver alloy is cold-welded to a foot made of a copper alloy, and then a post-oxidation treatment is performed. It has a feature. In this way, the foot has higher oxidation resistance than Cu and does not scale out during internal oxidation treatment.
By using the u alloy, the purpose of not using expensive Ag was achieved.

【０００６】上記接点素子の材料として、頭部にはＡｇ
−Ｃｄ，Ａｇ−Ｓｎ，Ａｇ−Ｃｄ−Ｓｎ，Ａｇ−Ｓｎ−
Ｉｎ等の合金を、また足部にはＣｕ−Ｃｒ，Ｃｕ−Ｃｒ
−Ｚｒ，Ｃｕ−Ｎｉ−Ｂｅ，Ｃｕ−Ａｌ等のＣｕより耐
酸化性の高い合金材料を使用する。As a material for the contact element, Ag is used for the head.
-Cd, Ag-Sn, Ag-Cd-Sn, Ag-Sn-
Alloys such as In and Cu-Cr, Cu-Cr for the feet
An alloy material having higher oxidation resistance than Cu, such as —Zr, Cu—Ni—Be, and Cu—Al, is used.

【０００７】頭部と足部とをヘッダー加工等によって冷
間圧接した後、接点素子の頭部を酸化するために酸素ま
たは酸素を含んだ雰囲気中５００〜８００℃にて内部酸
化するが、この時接合強度の弱い材料同志の場合には、
冷間圧接した後、非酸化性の雰囲気中で５００〜８００
℃で拡散接合処理をした後に、酸素または酸素を含んだ
雰囲気中で５００〜８００℃にて内部酸化する。After the head and the foot are cold-welded by header processing or the like, internal oxidation is performed at 500 to 800 ° C. in the atmosphere containing oxygen or oxygen in order to oxidize the head of the contact element. In the case of materials with weak joint strength,
After cold pressure welding, 500 ~ 800 in non-oxidizing atmosphere
After the diffusion bonding process at 0 ° C, internal oxidation is performed at 500 to 800 ° C in oxygen or an atmosphere containing oxygen.

【０００８】足部にＣｕ−Ｃｒ合金を用いた場合、Ｃｒ
含有量は０．０５ｗｔ％未満では耐酸化性が不足し、一
方２ｗｔ％を越えると塑性加工性に劣り接合不良、電気
抵抗の増加という好ましくない現像が生じる。なおＣｒ
量のより好ましい範囲としては０．３〜０．８ｗｔ％で
ある。When Cu--Cr alloy is used for the foot, Cr
If the content is less than 0.05 wt%, the oxidation resistance is insufficient, while if it exceeds 2 wt%, the plastic workability is poor and the unsatisfactory development such as defective bonding and increased electrical resistance occurs. Note that Cr
A more preferable range of the amount is 0.3 to 0.8 wt%.

【０００９】[0009]

【作用】接点素子の足部にＣｕよりも耐酸化性が高いＣ
ｕ合金を用いているので、内部酸化処理時にも、スケー
ルアウトすることなく頭部と足部の接合強度が十分な接
点素子が得られる結果、高価なＡｇまたはＡｇ合金を用
いなくてよい。[Function] The foot portion of the contact element has C, which has higher oxidation resistance than Cu.
Since the u alloy is used, a contact element having sufficient joint strength between the head and the foot can be obtained without scale-out even during the internal oxidation treatment, and as a result, expensive Ag or Ag alloy need not be used.

【００１０】[0010]

【実施例】以下本発明をその実施例を示し乍ら詳述す
る。実施例１ 頭部１用材料として直径１．８mmのＡｇ−１４ｗｔ％Ｃ
ｄ−１ｗｔ％Ｓｎ合金線材を、足部２用材料として直径
１．８mmのＣＵ−０．８ｗｔ％Ｃｒ合金線材を用いて、
それぞれ長さ１．６mm，２．２mmに切断し、同一軸上に
重合してヘッダー加工で冷間圧接し、リベット形接点素
子形状にした。その接点素子を酸素雰囲気中にて７００
℃で１０時間加熱し、いわゆる後酸化法によって図１に
示す接点素子を得た。The present invention will be described in detail below with reference to its examples. Example 1 As a material for the head 1, Ag-14 wt% C having a diameter of 1.8 mm
Using a d-1 wt% Sn alloy wire as a foot 2 material, a CU-0.8 wt% Cr alloy wire having a diameter of 1.8 mm,
Each of them was cut into a length of 1.6 mm and a length of 2.2 mm, superposed on the same shaft, and subjected to header pressure cold welding to form a rivet-type contact element. The contact element is 700 in an oxygen atmosphere.
The contact element shown in FIG. 1 was obtained by so-called post-oxidation method after heating at 10 ° C. for 10 hours.

【００１１】実施例２ 上記実施例１と同様の成分、大きさ、形状から成る頭部
１用材料及び足部２用材料をヘッダー加工で冷間圧接
し、リベット形接点素子形状にし、その接点素子を窒素
雰囲気中にて７００℃に加熱して拡散接合を行った。次
いで酸素雰囲気中にて７００℃で１０時間加熱し（後酸
化法）、図１の接点素子を得た。頭部と足部との接合強
度を測定したところ、従来品（前酸化法）の接合強度が
８０Ｎであったのに対し、この実施例２のそれは平均１
３０Ｎという高い価が得られた。 Example 2 A head 1 material and a foot 2 material having the same components, sizes, and shapes as those in Example 1 were header-processed and cold-welded to form a rivet-shaped contact element, and the contact point was formed. The element was heated to 700 ° C. in a nitrogen atmosphere to perform diffusion bonding. Then, it was heated in an oxygen atmosphere at 700 ° C. for 10 hours (post-oxidation method) to obtain the contact element shown in FIG. When the joint strength between the head and the foot was measured, the joint strength of the conventional product (preoxidation method) was 80 N, whereas that of Example 2 was 1 on average.
A high value of 30N was obtained.

【００１２】[0012]

【発明の効果】以上説明して来た如く、本発明方法によ
れば次の効果を有する。 接点素子の足部に、ＡｇまたはＡｇ合金よりも安価
なＣｕ合金を用いることが出来る。 頭部と足部の接合強度が高く、安定した接点素子が
製造出来る。 ヘッダー加工に於いて、接点素子の頭部にクラック
が発生することなく、また頭部と足部の接合不良もな
く、歩留が向上する。As described above, the method of the present invention has the following effects. A Cu alloy, which is cheaper than Ag or an Ag alloy, can be used for the foot portion of the contact element. The joint strength between the head and foot is high, and a stable contact element can be manufactured. In the header processing, the yield is improved without cracks occurring in the head of the contact element and without defective joint between the head and the foot.

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

【図１】本発明実施例で得られた接点素子の断面図であ
る。FIG. 1 is a cross-sectional view of a contact element obtained in an example of the present invention.

【符号の説明】[Explanation of symbols]

１ 頭部 ２ 足部 1 head 2 feet

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 銀合金より成る頭部に、銅合金より成る
足部を冷間圧接し、次いで後酸化処理を行うことを特徴
とするリベット形複合接点素子の製造方法。1. A method of manufacturing a rivet-type composite contact element, which comprises cold-welding a head made of a silver alloy to a head made of a silver alloy, and then performing a post-oxidation treatment. 【請求項２】 クロム含有量が０．０５〜２ｗｔ％の銅
−クロム合金が足部である請求項１に記載のリベット形
複合接点素子の製造方法。2. The method of manufacturing a rivet-type composite contact element according to claim 1, wherein the foot portion is made of a copper-chromium alloy having a chromium content of 0.05 to 2 wt%.