JPS6254867B2 - - Google Patents
Info
- Publication number
- JPS6254867B2 JPS6254867B2 JP6027380A JP6027380A JPS6254867B2 JP S6254867 B2 JPS6254867 B2 JP S6254867B2 JP 6027380 A JP6027380 A JP 6027380A JP 6027380 A JP6027380 A JP 6027380A JP S6254867 B2 JPS6254867 B2 JP S6254867B2
- Authority
- JP
- Japan
- Prior art keywords
- electrical contact
- strip material
- contact strip
- metal
- electric furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000010953 base metal Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 14
- 239000003517 fume Substances 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- 229910001369 Brass Inorganic materials 0.000 description 6
- 239000010951 brass Substances 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229910052793 cadmium Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Manufacture Of Switches (AREA)
Description
本発明は、電気接点帯材の熱処理方法の改良に
関する。
一般に電気接点帯材又はベース金属に接点金属
を接合した複合電気接点帯材（以下これらを総称
して単に電気接点帯材と呼ぶ。）を熱処理する方
法としては、第１図ａに示す如くコイル状に巻い
た電気接点帯材１を第１図ｂに示す如くカマド形
の電気炉２に挿入して熱処理する方法と、第２図
に示す如く材料送りロール３から電気接点帯材１
を引き出してこれを加熱域４及び冷却域５を順次
設けた横形熱処理用電気炉６内に導入し、水平移
動して、材料巻取りロール７へ巻取り、連続的に
熱処理する方法とがある。
ところで、上記の熱処理方法に於いて、熱処理
を施す電気接点帯材の内、接点金属又はベース金
属に蒸気圧の高い金属（例えばZn、Cdが著し
い）が含有されている場合には、熱処理中にこれ
らの金属が蒸発し、金属ヒユームとなつて電気炉
２又は６内に飛散し、その一部は炉壁に付着した
り、他の一部は電気接点帯材１に付着したりする
ものである。尚、ここで蒸気圧の高い金属とは、
Zn、Cd以外に、使用する雰囲気（例えばH2−N2
混合ガス）に作用する金属（例えばCu）を言
う。
前記炉壁に付着した金属ヒユームはZn、Cdの
場合は短時間のうち、Cuは長期間かかつて堆積
した後脱落し、電気接点帯材１に付着するもので
ある。このように蒸発した金属ヒユームが電気接
点帯材１の内、特に接触面である接点金属に付着
すると、付着した金属ヒユームが接点金属と蒸着
拡散したり、或いはそのままの状態で残存し、こ
れがその後電気接点に加工されて使用に供された
際、導電性の低下、接触抵抗の増大及び溶着回数
の増加等の接点性能の劣下を来たすという問題点
があつた。
本発明はかかる問題点を解決すべくなされたも
のであり、接点金属又はベース金属に含有されて
いる蒸気圧の高い金属が熱処理時に蒸発し、電気
炉内に飛散しても電気接点帯材に殆んど付着しな
いようにした電気接点帯材の熱処理方法を提供せ
んとするものである。
以下本発明の電気接点帯材の熱処理方法を図に
よつて説明すると、第３図に示す如く上層部を発
熱体を設けた加熱域４′となし、下層部を水冷ジ
ヤケツトを設けた冷却域５′となした縦形熱処理
用電気炉８に於いて、加熱域４′の上方に材料送
りロール３を配し、冷却域５′の下方に材料巻取
りロール７を配して、電気接点帯材１を材料送り
ロール３より引き出して加熱域４′の上端開口
４′ａより電気炉８内に導入し、移動通過させ
て、下端開口５′ａより導出し、材料巻取りロー
ル７へ巻取り、連続的に熱処理することを特徴と
するものである。
かように本発明の電気接点帯材の熱処理方法
は、電気炉８内を上層部の加熱域４′から下層部
の冷却域５′へと電気接点帯材１を移動通過させ
て熱処理するのであるから、電気接点帯材１の接
点金属又はベース金属に含有されている蒸気圧の
高い金属が蒸発し金属ヒユームとなつて炉内に飛
散しても、電気炉８の形状が縦形である為炉心に
電気接点帯材１を位置合せすることが容易であ
り、しかもその熱対流により金属ヒユームの殆ん
どが加熱域４′の上端開口４′ａから炉外から排出
される。従つて炉壁や電気接点帯材１に金属ヒユ
ームが付着することがないものである。
次に本発明の電気接点帯材の熱処理方法の効果
を明瞭ならしめる為、その具体的な実施例と従来
例との比較について述べる。
実施例
第３図に於いて加熱域４′の長さを４ｍ、冷却
域５′の長さを５ｍとなした縦形熱処理用電気炉
８に於いて、黄銅より成るベース金属の表面に銀
より成る接点金属を接合した電気接点帯材１をコ
イル状に巻いて、これを加熱域４′の上方に設け
た材料送りロール７に装着し、然る後材料送りロ
ール７から電気接点帯材１を引き出して加熱域
４′の上端開口４′ａより電気炉８内に導入し、１
ｍ／分の速度で移動通過させて、下端開口５′ａ
より導出し、冷却域５′の下方に設けた材料巻取
りロール７へ巻取り、連続的に電気接点帯材１を
熱処理した。尚この時の加熱域４に於ける熱処理
条件はH2＋N2混合ガス雰囲気、650℃であつた。
従来例 １
第１図ｂに示すようなカマド形の電気炉２中
に、黄銅より成るベース金属に銀より成る接点金
属を接合した電気接点帯材１をコイル状に巻いて
挿入し、H2＋N2の混合ガス雰囲気、650℃にて30
分間保持し熱処理した。
従来例 ２
第２図に示すような横形熱処理用電気炉６内
に、黄銅より成るベース金属に銀より成る接点金
属を接合した電気接点帯材１を材料送りロール３
から引き出して導入し、図中左方から右方へ電気
炉６内を１ｍ／分の速度で水平に移動通過させ、
材料巻取りロール７へ巻取り、連続的に電気接点
帯材１を熱処理した。尚この時の加熱域４に於け
る熱処理条件はH2＋N2混合ガス雰囲気、650℃で
あつた。
このようにして熱処理された各電気接点帯材１
の銀面をＸ線マイクロアナライザーにて亜鉛分析
を行ない、亜鉛の存在及び存在する場合の亜鉛の
拡散深度を測定し、またこれらの電気接点帯材を
プレスにて打抜いて電気接点となし、その接点の
開閉試験を下記の試験条件にて行ない接触抵抗及
び溶着回数を測定したところ、下記の表に示すよ
うな結果を得た。
開閉試験条件
電圧：AC100V
電流：投入電流35A、定常電流7A
負荷：誘導＋抵抗
力率：0.7
開閉回数：1000回
The present invention relates to an improved method for heat treating electrical contact strips. In general, as a method for heat-treating an electrical contact strip material or a composite electrical contact strip material in which a contact metal is bonded to a base metal (hereinafter collectively referred to simply as "electrical contact strip material"), a coil coil as shown in Figure 1a is used. A method of inserting the electrical contact strip material 1 wound into a shape into a kamado-shaped electric furnace 2 and heat-treating it as shown in FIG.
There is a method in which the material is pulled out and introduced into a horizontal heat treatment electric furnace 6 which is provided with a heating zone 4 and a cooling zone 5 in sequence, moved horizontally, wound onto a material winding roll 7, and heat-treated continuously. . By the way, in the above heat treatment method, if the contact metal or the base metal of the electrical contact strip material to be heat treated contains metals with high vapor pressure (for example, Zn and Cd are significant), the heat treatment may These metals evaporate and become a metal fume that scatters into the electric furnace 2 or 6, some of which adheres to the furnace wall and some of which adheres to the electrical contact strip material 1. It is. Note that metals with high vapor pressure are
In addition to Zn and Cd, the atmosphere used (e.g. H 2 −N 2
A metal (e.g. Cu) that acts on a mixed gas (mixed gas). The metal fume deposited on the furnace wall is deposited for a short time in the case of Zn and Cd, and for a long period of time in the case of Cu, which then falls off and adheres to the electrical contact strip material 1. When the evaporated metal fume adheres to the electrical contact band material 1, especially the contact metal that is the contact surface, the adhered metal fume may evaporate and diffuse into the contact metal, or remain as it is, and this may be When processed into electrical contacts and put into use, there were problems in that the contact performance deteriorated, such as a decrease in conductivity, an increase in contact resistance, and an increase in the number of welds. The present invention has been made to solve this problem, and even if the metal with high vapor pressure contained in the contact metal or base metal evaporates during heat treatment and scatters in the electric furnace, the electric contact strip material will not be damaged. It is an object of the present invention to provide a method for heat treating an electrical contact strip material so that almost no adhesion occurs. Hereinafter, the heat treatment method for electrical contact strips of the present invention will be explained with reference to the drawings. As shown in FIG. In the vertical heat treatment electric furnace 8 designated as 5', a material feed roll 3 is arranged above the heating zone 4', a material winding roll 7 is arranged below the cooling zone 5', and the electric contact strip is The material 1 is pulled out from the material feed roll 3, introduced into the electric furnace 8 through the upper end opening 4'a of the heating zone 4', moved through it, led out through the lower end opening 5'a, and wound onto the material winding roll 7. It is characterized in that it is removed and continuously heat-treated. As described above, the method for heat treating electrical contact strip material of the present invention involves heat treating the electrical contact strip material 1 by moving it through the electric furnace 8 from the heating zone 4' in the upper layer to the cooling zone 5' in the lower layer. Therefore, even if the metal with high vapor pressure contained in the contact metal or base metal of the electrical contact strip material 1 evaporates and becomes a metal fume and scatters in the furnace, the electric furnace 8 is vertical in shape. It is easy to align the electrical contact strip 1 with the reactor core, and most of the metal fume is discharged from the outside of the reactor through the upper end opening 4'a of the heating zone 4' due to the thermal convection. Therefore, metal fume does not adhere to the furnace wall or the electrical contact strip material 1. Next, in order to clarify the effects of the heat treatment method for electrical contact strip material of the present invention, a comparison between a specific example and a conventional example will be described. Example In FIG. 3, in a vertical heat treatment electric furnace 8 in which the length of the heating zone 4' is 4 m and the length of the cooling zone 5' is 5 m, the surface of the base metal made of brass is coated with silver. The electrical contact strip material 1 made of bonded contact metals is wound into a coil and is mounted on a material feed roll 7 provided above the heating area 4', and then the electrical contact strip material 1 is rolled from the material feed roll 7 is pulled out and introduced into the electric furnace 8 through the upper end opening 4'a of the heating area 4',
The lower end opening 5'a is moved at a speed of m/min.
The electrical contact strip material 1 was then taken out and wound onto a material take-up roll 7 provided below the cooling zone 5', and the electrical contact strip material 1 was continuously heat-treated. The heat treatment conditions in heating zone 4 at this time were an H 2 +N 2 mixed gas atmosphere and 650°C. Conventional Example 1 An electric contact strip material 1 made of a base metal made of brass and a contact metal made of silver bonded to a base metal made of brass is wound into a coil and inserted into a kamado-shaped electric furnace 2 as shown in Fig. 1b. + N2 mixed gas atmosphere, 30 at 650℃
It was held for a minute and heat treated. Conventional Example 2 An electrical contact strip material 1 made of a base metal made of brass and a contact metal made of silver bonded to a base metal made of brass is placed in a horizontal heat treatment electric furnace 6 as shown in FIG.
It was pulled out and introduced, and moved horizontally through the electric furnace 6 from the left to the right in the figure at a speed of 1 m/min.
The material was wound onto a winding roll 7 and the electrical contact strip 1 was continuously heat-treated. The heat treatment conditions in heating zone 4 at this time were an H 2 +N 2 mixed gas atmosphere and 650°C. Each electrical contact strip material 1 heat-treated in this way
Zinc analysis is performed on the silver surface using an X-ray microanalyzer to measure the presence of zinc and, if present, the diffusion depth of zinc, and these electrical contact strips are punched out using a press to form electrical contacts. An opening/closing test of the contacts was conducted under the following test conditions, and the contact resistance and number of times of welding were measured, and the results shown in the table below were obtained. Switching test conditions Voltage: AC100V Current: Closing current 35A, steady current 7A Load: Inductive + resistive power factor: 0.7 Number of switching: 1000 times
【表】
上記の表で明らかなように従来の熱処理方法に
より熱処理された電気接点帯材は、ベース金属と
して使用した黄銅に含有されている亜鉛が熱処理
時に蒸発し、金属ヒユームとなつて飛散し、これ
が接点面へも付着し、僅か乍ら銀中へ拡散し、そ
の後の接点の開閉試験に於いて接点性能を低下さ
せているのに対し、本発明の熱処理方法により熱
処理された電気接点帯材は、接点面への亜鉛の付
着が殆んど認められず、その後の接点の開閉試験
に於いて接点性能が低下していないことが判る。
尚銅の付着は、観察することができなかつた。
以上詳記した通り本発明の電気接点帯材の熱処
理方法は、上層部を加熱域、下層部を冷却域とな
した縦形熱処理用電気炉にて電気接点帯材の熱処
理するのであるから接点金属又はベース金属に含
有された蒸気圧の高いZn、Cd等の金属が蒸発
し、金属ヒユームとなつて電気炉内に飛散しても
その殆んどが熱対流により炉外に排出される。従
つて電気接点帯材へ金属ヒユームが付着すること
がないので、その後電気接点に加工されて使用に
供された際、導電性の低下、接触抵抗の増大及び
溶着回数の増加等の接点性能の低下を防止でき
て、高い信頼性が得られる。
尚、本発明の熱処理方法に於いて、縦形熱処理
用電気炉の上端開口の近傍に集塵機等を設け、電
気炉内の雰囲気を乱さない程度の吸引力にて電気
炉内の金属ヒユームを吸引してやれば炉外へ排出
される金属ヒユームが周囲に飛散することがな
く、環境衛生上有効であることを付言しておく。[Table] As is clear from the above table, the electrical contact strip material heat-treated using the conventional heat treatment method has the possibility that the zinc contained in the brass used as the base metal evaporates during heat treatment and scatters as a metal fume. This adheres to the contact surface and slightly diffuses into the silver, reducing the contact performance in subsequent contact opening/closing tests. There was almost no zinc adhesion on the contact surface of the material, and it was found that the contact performance did not deteriorate in subsequent contact opening/closing tests.
Furthermore, no copper deposition could be observed. As detailed above, the method for heat treating electrical contact strips of the present invention involves heat treating electrical contact strips in a vertical heat treatment electric furnace with an upper layer as a heating zone and a lower layer as a cooling zone. Alternatively, even if metals such as Zn and Cd with high vapor pressure contained in the base metal evaporate and become a metal fume and are scattered inside the electric furnace, most of it is discharged outside the furnace by thermal convection. Therefore, metal fumes do not adhere to the electrical contact strip material, so when it is processed into electrical contacts and put into use, there are no problems with contact performance such as a decrease in conductivity, an increase in contact resistance, and an increase in the number of welds. Deterioration can be prevented and high reliability can be obtained. In addition, in the heat treatment method of the present invention, a dust collector or the like is installed near the upper opening of the vertical electric furnace for heat treatment, and the metal fume inside the electric furnace is sucked out with a suction force that does not disturb the atmosphere inside the electric furnace. It should be noted that the metal fume discharged outside the furnace is not scattered around, which is effective in terms of environmental hygiene.
第１図ａは電気接点帯材をコイル状に巻いた斜
視図、仝図ｂはコイル状に巻いた電気接点帯材の
従来の熱処理方法を示す断面図、第２図は従来の
電気接点帯材の熱処理方法を示す断面図、第３図
は本発明の電気接点帯材の熱処理方法を示す断面
図である。
１……電気接点帯材、３……材料送りロール、
４′……加熱域、５′……冷却域、７……材料巻取
りロール、８……縦形の熱処理用電気炉。
Figure 1a is a perspective view of an electrical contact strip wound into a coil, Figure b is a sectional view showing a conventional heat treatment method for an electrical contact strip wound into a coil, and Figure 2 is a conventional electrical contact strip. FIG. 3 is a sectional view showing a method for heat treating an electrical contact strip material of the present invention. 1... Electric contact strip material, 3... Material feeding roll,
4'...Heating zone, 5'...Cooling zone, 7...Material winding roll, 8...Vertical electric furnace for heat treatment.
Claims (1)
材又は蒸気圧の高い金属元素を含有するベース金
属に接点金属を接合した複合電気接点帯材を熱処
理するに於いて、上層部を加熱域、下層部を冷却
域となした縦型熱処理用電気炉にて前記電気接点
帯材又は複合電気接点帯材を上層部より下層部へ
移動通過させて連続的に熱処理することを特徴と
する電気接点帯材の製造方法。1. When heat-treating an electrical contact strip material containing a metal element with high vapor pressure or a composite electrical contact strip material in which a contact metal is bonded to a base metal containing a metal element with high vapor pressure, the upper layer is heated in a heating area, An electrical contact characterized in that the electrical contact strip material or the composite electrical contact strip material is continuously heat-treated by moving it from the upper layer to the lower layer in a vertical heat treatment electric furnace with a lower layer as a cooling zone. Method of manufacturing strip material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6027380A JPS56156744A (en) | 1980-05-07 | 1980-05-07 | Heat treatment of beltlike electrical contact material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6027380A JPS56156744A (en) | 1980-05-07 | 1980-05-07 | Heat treatment of beltlike electrical contact material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56156744A JPS56156744A (en) | 1981-12-03 |
| JPS6254867B2 true JPS6254867B2 (en) | 1987-11-17 |
Family
ID=13137359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6027380A Granted JPS56156744A (en) | 1980-05-07 | 1980-05-07 | Heat treatment of beltlike electrical contact material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56156744A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342768U (en) * | 1989-08-28 | 1991-04-23 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978572A (en) * | 2011-09-07 | 2013-03-20 | 无锡尚德太阳能电力有限公司 | Method for preparing CdTe film and thermal evaporation device |
| CN103695693B (en) * | 2013-12-13 | 2016-07-20 | 昆明贵金属研究所 | A kind of preparation method of gold-base alloy contact material |
-
1980
- 1980-05-07 JP JP6027380A patent/JPS56156744A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342768U (en) * | 1989-08-28 | 1991-04-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56156744A (en) | 1981-12-03 |
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