JPS6353242B2 - - Google Patents
Info
- Publication number
- JPS6353242B2 JPS6353242B2 JP58235389A JP23538983A JPS6353242B2 JP S6353242 B2 JPS6353242 B2 JP S6353242B2 JP 58235389 A JP58235389 A JP 58235389A JP 23538983 A JP23538983 A JP 23538983A JP S6353242 B2 JPS6353242 B2 JP S6353242B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- infiltrant
- metal
- layer
- electrical contacts
- 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 21
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000011733 molybdenum Substances 0.000 claims 1
- 230000008595 infiltration Effects 0.000 description 17
- 238000001764 infiltration Methods 0.000 description 17
- 239000000843 powder Substances 0.000 description 12
- 238000005219 brazing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000010953 base metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- UYKQQBUWKSHMIM-UHFFFAOYSA-N silver tungsten Chemical compound [Ag][W][W] UYKQQBUWKSHMIM-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OMSFUHVZHUZHAW-UHFFFAOYSA-N [Ag].[Mo] Chemical compound [Ag].[Mo] OMSFUHVZHUZHAW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- WUUZKBJEUBFVMV-UHFFFAOYSA-N copper molybdenum Chemical compound [Cu].[Mo] WUUZKBJEUBFVMV-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Manufacture Of Switches (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は電気接点に用いられる複合焼結品に関
する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a composite sintered product used for electrical contacts.
一般に焼結品からなる電気接点は、耐アーク性
に優れたタングステンやタングステンカーバイト
等の高融点金属からなる焼結体に、良導電性を有
る銅や銀などを溶浸して形成している。そして、
この電気接点は銅や鉄からなる台金に、銅ろうや
銀ろうを用いたろう付けにより接合して使用して
いる。このため、この電気接点では焼結体に溶浸
する銅や銀などの溶浸材の余剰分を利用して、焼
結体に溶浸材層（金属部）を設けてろう付け面と
し、この溶浸材層にてろう付けを行ない、台金に
対するろう付けの接合信頼性を高めることが行な
われている。
Generally, electrical contacts made of sintered products are formed by infiltrating a sintered body made of a high-melting point metal such as tungsten or tungsten carbide, which has excellent arc resistance, with copper, silver, etc., which have good conductivity. . and,
These electrical contacts are connected to a metal base made of copper or iron by brazing with copper or silver solder. For this reason, in this electrical contact, an infiltrant layer (metal part) is provided on the sintered body by using the surplus of the infiltrant such as copper or silver that is infiltrated into the sintered body and used as a brazing surface. Brazing is performed using this infiltration material layer to improve the reliability of brazing to the base metal.
この場合、従来の電気接点は、第１図で示すよ
うに焼結体１の表面上に溶浸材層２を突出して設
けた構成をなしている。 In this case, the conventional electrical contact has a structure in which an infiltrant layer 2 is provided protrudingly on the surface of a sintered body 1, as shown in FIG.
この電気接点は次のように製造される。一般に
溶浸処理は、第２図で示すように黒鉛などからな
る容器４の内部に焼結体１と溶浸材３とを重ねて
収容し、この容器４を電気炉の内部に入れて加熱
することにより、溶浸材３を溶かして焼結体１の
内部に溶浸させるものである。しかるに、従来の
電気接点の製造工程において溶浸処理を行なう場
合には、第２図で示すように溶浸材層２の大きさ
に応じた凹部５を底部に形成した容器４を使用し
ている。すなわち、容器４の底部上に前記凹部５
をまたいで焼結体１と溶浸材３を設け、焼結体１
に溶浸した溶浸材３の余剰分（焼結体１からはみ
出した分）を、容器４の凹部５に集めることによ
り、焼結体１表面に突出した状態で溶浸材層２を
形成している。 This electrical contact is manufactured as follows. Generally, the infiltration process is carried out by stacking the sintered body 1 and the infiltrating material 3 in a container 4 made of graphite or the like, placing the container 4 in an electric furnace, and heating it. By doing so, the infiltrant material 3 is melted and infiltrated into the inside of the sintered body 1. However, when performing infiltration treatment in the conventional manufacturing process of electrical contacts, a container 4 having a recess 5 formed at the bottom corresponding to the size of the infiltrant layer 2 is used, as shown in FIG. There is. That is, the recess 5 is formed on the bottom of the container 4.
A sintered body 1 and an infiltration material 3 are provided across the sintered body 1.
By collecting the surplus of the infiltrant 3 (protruding from the sintered body 1) in the recess 5 of the container 4, the infiltrant layer 2 is formed in a state protruding from the surface of the sintered body 1. are doing.
しかしながら、電気接点はその用途および仕様
に応じて様々な大きさの異なるものがあり、これ
に伴い台金とのろう付面、すなわち溶浸材層２の
大きさが様々に変化する。したがつて、溶浸材層
２の大きさが異なる毎に、夫々その溶浸材層２の
大きさに応じた凹部５を有する容器４が必要であ
り、結果的に多種類の容器４を製作することにな
り、容器４の製作に多くの労力を要するとともに
経済性が大変悪い。 However, there are electrical contacts of various sizes depending on their uses and specifications, and accordingly, the size of the brazed surface with the base metal, that is, the size of the infiltrant layer 2 varies. Therefore, each time the size of the infiltrant layer 2 is different, a container 4 having a recess 5 corresponding to the size of the infiltrant layer 2 is required, and as a result, many types of containers 4 are required. Therefore, manufacturing the container 4 requires a lot of labor and is very uneconomical.
本発明は前記事情に基づいてなされたもので、
焼結体に設ける金属部の大きさに制約されずに、
多大な労力と経費を伴うことなく製造できる電気
接点用複合焼結品を提供するものである。
The present invention was made based on the above circumstances, and
without being restricted by the size of the metal part provided in the sintered body,
The present invention provides a composite sintered product for electrical contacts that can be manufactured without much labor and expense.
本発明の電気接点用複合焼結品は、凹部を有
し、耐アーク性に優れた高融点金属からなる焼結
体に、良導電性を有する金属の溶浸材を溶浸した
ものであり、前記凹部は焼結体に溶浸された前記
溶浸材よりなる溶浸材層を設けてなることを特徴
とする。
The composite sintered product for electrical contacts of the present invention is made by infiltrating a sintered body made of a high-melting point metal with excellent arc resistance and having a recessed part with a metal infiltration material having good conductivity. , the recess is provided with an infiltrant layer made of the infiltrant infiltrated into the sintered body.
本発明の複合焼結品をさらに具体的に云えば、
凹部を有する焼結体は溶浸材を溶浸したものであ
り、金属部は焼結体に溶浸した溶浸材により焼結
体の凹部に形成した溶解材層である。 More specifically, the composite sintered product of the present invention is as follows:
The sintered body having the concave portion is infiltrated with an infiltrant, and the metal portion is a layer of dissolved material formed in the concave portion of the sintered body by the infiltrant material infiltrated into the sintered body.
第３図および第４図は本発明の複合焼結品の構
成の一例を示している。図中１１は所定の金属か
らなる焼結体で、その一面例えば下面には凹部１
２が形成されている。この焼結体１１には所定の
金属からなる溶浸材が溶浸されている。図中１３
は焼結体１１の凹部１２の内部に形成された溶浸
材層で、これは焼結体１１に溶浸した溶浸材が焼
結体１１の凹部１２内に充填して形成されたもの
である。 3 and 4 show an example of the structure of the composite sintered product of the present invention. In the figure, reference numeral 11 denotes a sintered body made of a predetermined metal, with a recess 1 on one surface, for example, the bottom surface.
2 is formed. This sintered body 11 is infiltrated with an infiltrant made of a predetermined metal. 13 in the diagram
is an infiltrant layer formed inside the recess 12 of the sintered body 11, and this layer is formed by filling the recess 12 of the sintered body 11 with the infiltrant material infiltrated into the sintered body 11. It is.
本発明において焼結体の凹部は、焼結体の前段
階である粉末成形体の段階で形成する。この形成
方法はプレスにより金属粉末を加圧して粉末成形
体を成形する時に形成するものである。第５図は
この形成方法を示している。図中１４は粉末成形
体成形用のプレスにおけるダイス、１５は上パン
チ、１６は下パンチである。一方のパンチ、例え
ば下パンチ１６は、第３図および第４図で示す凹
部１２を形成するためのもので、その上面の周縁
部は環状に切欠され、凹部１２の大きさに応じた
部分が突部１６ａとして形成されている。そし
て、ダイス１４の内部に焼結体の材料となる金属
粉末１７を充填し、上パンチ１５と下パンチ１６
により金属粉末１７を加圧して粉末成形体を成形
する。この場合、下パンチ１６の突部１６ａによ
り粉末成形体の下面に凹部１２が形成される。し
かして、この方法において凹部を形成するための
下パンチ１６は、従来から粉末成形体を成形する
ために用いられている上パンチ１５の如きパンチ
を用意し、このパンチに機械加工を施して図示形
状のように凹部に応じた大きさの突部１６ａを形
成する。このため、凹部成形用のパンチを容易且
つ経済的に得ることができる。 In the present invention, the concave portion of the sintered body is formed at the stage of forming the powder compact, which is a stage before forming the sintered body. This forming method is performed when pressing metal powder with a press to form a powder compact. FIG. 5 shows this method of formation. In the figure, 14 is a die in a press for forming a powder compact, 15 is an upper punch, and 16 is a lower punch. One of the punches, for example, the lower punch 16, is for forming the recess 12 shown in FIGS. 3 and 4, and the peripheral edge of its upper surface is cut out in an annular shape, with a portion corresponding to the size of the recess 12. It is formed as a protrusion 16a. Then, the inside of the die 14 is filled with metal powder 17 which becomes the material of the sintered body, and the upper punch 15 and the lower punch 16
The metal powder 17 is pressurized to form a powder compact. In this case, the protrusion 16a of the lower punch 16 forms a recess 12 on the lower surface of the powder compact. In this method, the lower punch 16 for forming the concave portion is prepared by preparing a punch such as the upper punch 15 conventionally used for molding powder compacts, and machining the punch as shown in the figure. A protrusion 16a having a size corresponding to the shape of the recess is formed. Therefore, a punch for forming recesses can be obtained easily and economically.
また、焼結体の凹部は、焼結体に機械加工を施
して形成することもできる。この場合も凹部の形
成は容易且つ安価に行なえる。 Further, the recessed portion of the sintered body can also be formed by machining the sintered body. In this case as well, the recesses can be formed easily and inexpensively.
本発明において焼結体に対する溶浸処理は、第
６図で示す方法で行なう。すなわち、図中１８は
黒鉛などからなる容器で、この容器１８の底部は
溶浸材層を形成するための凹部が無く平坦面とな
つている。そして、容器１８の底部に焼結体１１
と溶浸材１９を重ねて設け、容器１８を炉に入れ
て加熱することにより溶浸材１９を焼結体１１の
内部に溶浸する。この場合、焼結体１１に溶浸し
た溶浸材１９が焼結体１１の凹部１２において溶
浸材層１２として形成される。しかして、この溶
浸処理においては、容器１８の底部に溶浸材層を
形成するための凹部を設けないので、容器を加工
する必要がない。このため、焼結体１１および溶
浸材層１２の大きさに関係なく、容器１８を共通
に使用することができる。従つて、従来のように
焼結体１１および溶浸材層１２の大きさに応じて
多種類の容器を製作する必要がない。なお、溶浸
処理後に必要に応じて、焼結体１１と溶浸材層１
３を仕上げ加工する。 In the present invention, the infiltration treatment for the sintered body is performed by the method shown in FIG. That is, in the figure, 18 is a container made of graphite or the like, and the bottom of this container 18 is a flat surface without any recess for forming an infiltration material layer. Then, the sintered body 11 is placed at the bottom of the container 18.
and the infiltrating material 19 are placed one on top of the other, and the infiltrating material 19 is infiltrated into the inside of the sintered body 11 by placing the container 18 in a furnace and heating it. In this case, the infiltrant 19 infiltrated into the sintered body 11 is formed as the infiltrant layer 12 in the recess 12 of the sintered body 11 . Therefore, in this infiltration treatment, since no recessed portion for forming an infiltration material layer is provided at the bottom of the container 18, there is no need to process the container. Therefore, regardless of the size of the sintered body 11 and the infiltrant layer 12, the container 18 can be used in common. Therefore, there is no need to manufacture many types of containers depending on the size of the sintered body 11 and the infiltrant layer 12 as in the conventional case. Note that after the infiltration treatment, if necessary, the sintered body 11 and the infiltration material layer 1
Finish processing 3.
このように構成された本発明の複合焼結品は、
電気接点として用いると最適である。電気接点と
して使用する場合における焼結体と溶浸材の材質
の組合せは、高融点金属と良導電金属の組合せが
実用的であり、例えば銅―タングステン、銅―タ
ングステンカーバイト、銀―タングステン、銀―
タングステンカーバイト、銅―モリブデン、銀―
モリブデンなどがある。そして、第７図で示すよ
うに焼結体１１の溶浸材層１３と台金２０とを、
銅ろうや銀ろうなどのろう材２１を用いてろう付
けして接合する。なお、溶浸材層１３は良好にろ
う付けが行なえる厚さで形成する。 The composite sintered product of the present invention configured in this way is
It is best used as an electrical contact. Practical combinations of materials for the sintered body and infiltration material when used as electrical contacts include a combination of a high melting point metal and a highly conductive metal, such as copper-tungsten, copper-tungsten carbide, silver-tungsten, Silver-
Tungsten carbide, copper - molybdenum, silver -
Molybdenum, etc. Then, as shown in FIG. 7, the infiltrant layer 13 of the sintered body 11 and the base metal 20 are
They are joined by brazing using a brazing material 21 such as copper solder or silver solder. Note that the infiltrant layer 13 is formed to a thickness that allows good brazing.
本発明の一実施例として電気接点を製造する場
合について説明する。
A case will be described in which an electrical contact is manufactured as an embodiment of the present invention.
タングステン粉末を加圧して、直径30mm、高さ
10mmの円形状をなし且つ直径25mm、深さ３mmの凹
部を有する粉末成形体を成形した。次いで、この
粉末成形体を焼結して焼結体とし、さらに焼結体
に水素雰囲気中1100℃×1Hの条件で銅を溶浸し
た。この時、焼結体の凹部には溶浸材層が形成さ
れた。そして、焼結体を仕上げ加工した後に、溶
浸材層（銅層）を介して銀ろう付けにより台金に
接合した。この結果、焼結体と台金とが強固に接
合できた。 Pressurized tungsten powder, diameter 30mm, height
A powder compact having a circular shape of 10 mm and a recess with a diameter of 25 mm and a depth of 3 mm was molded. Next, this powder compact was sintered to obtain a sintered body, and the sintered body was further infiltrated with copper at 1100° C. for 1 hour in a hydrogen atmosphere. At this time, an infiltrant layer was formed in the recessed portion of the sintered body. After finishing the sintered body, it was joined to the base metal by silver brazing via the infiltration material layer (copper layer). As a result, the sintered body and the base metal could be firmly joined.
この実施例によれば、溶浸材層の厚み及び焼結
体に占める位置が、常に一定であるため、均一な
接合強度が得られる利点がある。このことは、ろ
う付工程を自動的に行なう場合特に有効である。 According to this embodiment, since the thickness of the infiltrant layer and the position occupied in the sintered body are always constant, there is an advantage that uniform bonding strength can be obtained. This is particularly effective when the brazing process is performed automatically.
本発明の電気接点用複合焼結品は以上説明した
ように、耐アーク性に優れた高融点金属からなる
焼結体に設ける良導電性金属の溶浸材の大きさが
異なるものを、多大の労力と経費を伴うことなく
製造することができる。
As explained above, the composite sintered product for electrical contacts of the present invention has a sintered body made of a high-melting point metal with excellent arc resistance, and a highly conductive metal infiltration material with different sizes. It can be manufactured without much effort and expense.
第１図は従来の複合焼結品である電気接点を示
す正面図、第２図は同電気接点の溶浸処理を示す
説明図、第３図は本発明の複合焼結品の一例を示
す正面図、第４図は同底面図、第５図は同複合焼
結品における粉末成形体の成形工程を示す説明
図、第６図は同複合焼結品の溶浸処理を示す説明
図、第７図は同複合焼結品を用いた電気接点部材
を示す説明図である。
１１……焼結体、１２……凹部、１３……溶浸
材層。
Fig. 1 is a front view showing an electrical contact which is a conventional composite sintered product, Fig. 2 is an explanatory diagram showing the infiltration treatment of the electrical contact, and Fig. 3 shows an example of the composite sintered product of the present invention. FIG. 4 is a front view, FIG. 4 is a bottom view of the same, FIG. 5 is an explanatory diagram showing the molding process of a powder compact in the composite sintered product, and FIG. 6 is an explanatory diagram showing the infiltration treatment of the composite sintered product. FIG. 7 is an explanatory diagram showing an electrical contact member using the same composite sintered product. 11... Sintered body, 12... Concave portion, 13... Infiltration material layer.
Claims (1)
からなる焼結体に、良導電性を有する金属の溶浸
材を溶浸したものであり、前記凹部は焼結体に溶
浸された前記溶浸材よりなる溶浸材層を設けてな
ることを特徴とする電気接点用複合焼結品。 ２ 耐アーク性に優れた高融点金属は、タングス
テン、タングステンカーバイトまたはモリブデン
である特許請求の範囲第１項に記載の電気接点用
複合焼結品。 ３ 良導電性を有する金属の溶浸材は銅または銀
である特許請求の範囲第１項に記載の電気接点用
複合焼結品。[Scope of Claims] 1 A sintered body made of a high-melting point metal with excellent arc resistance and having a recessed part is infiltrated with a metal infiltrant having good conductivity, and the recessed part is A composite sintered product for electrical contacts, comprising an infiltrant layer made of the infiltrant material infiltrated into a compact. 2. The composite sintered product for electrical contacts according to claim 1, wherein the high melting point metal with excellent arc resistance is tungsten, tungsten carbide, or molybdenum. 3. The composite sintered product for electrical contacts according to claim 1, wherein the metal infiltrant having good conductivity is copper or silver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23538983A JPS60128203A (en) | 1983-12-14 | 1983-12-14 | Composite sintered parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23538983A JPS60128203A (en) | 1983-12-14 | 1983-12-14 | Composite sintered parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60128203A JPS60128203A (en) | 1985-07-09 |
| JPS6353242B2 true JPS6353242B2 (en) | 1988-10-21 |
Family
ID=16985354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23538983A Granted JPS60128203A (en) | 1983-12-14 | 1983-12-14 | Composite sintered parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60128203A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6304454B2 (en) * | 2016-03-29 | 2018-04-04 | 三菱電機株式会社 | Contact member manufacturing method, contact member and vacuum valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518561A (en) * | 1974-07-09 | 1976-01-23 | Tokyo Shibaura Electric Co | Shoketsufukugotaino seizohoho |
| JPS5317506A (en) * | 1976-07-31 | 1978-02-17 | Otaki Noriko | Monobloc sintering process in powder metallurgy |
| JPS5579807A (en) * | 1978-12-07 | 1980-06-16 | Seiko Instr & Electronics Ltd | Production of portable watch case with decorative plate |
| JPS57158302A (en) * | 1981-03-24 | 1982-09-30 | Nissan Motor Co Ltd | Method and device for molding composite material |
-
1983
- 1983-12-14 JP JP23538983A patent/JPS60128203A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518561A (en) * | 1974-07-09 | 1976-01-23 | Tokyo Shibaura Electric Co | Shoketsufukugotaino seizohoho |
| JPS5317506A (en) * | 1976-07-31 | 1978-02-17 | Otaki Noriko | Monobloc sintering process in powder metallurgy |
| JPS5579807A (en) * | 1978-12-07 | 1980-06-16 | Seiko Instr & Electronics Ltd | Production of portable watch case with decorative plate |
| JPS57158302A (en) * | 1981-03-24 | 1982-09-30 | Nissan Motor Co Ltd | Method and device for molding composite material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60128203A (en) | 1985-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |