JPS644599B2 - - Google Patents
Info
- Publication number
- JPS644599B2 JPS644599B2 JP21051685A JP21051685A JPS644599B2 JP S644599 B2 JPS644599 B2 JP S644599B2 JP 21051685 A JP21051685 A JP 21051685A JP 21051685 A JP21051685 A JP 21051685A JP S644599 B2 JPS644599 B2 JP S644599B2
- Authority
- JP
- Japan
- Prior art keywords
- titanium
- oxide film
- recess
- colored
- film
- 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
- 238000011282 treatment Methods 0.000 claims description 19
- 239000010936 titanium Substances 0.000 claims description 17
- 229910052719 titanium Inorganic materials 0.000 claims description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 16
- 238000007733 ion plating Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 6
- 230000000873 masking effect Effects 0.000 claims description 6
- 238000007743 anodising Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000010407 anodic oxide Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000012495 reaction gas Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- -1 eyeglass frames Chemical compound 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B45/00—Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects
- G04B45/0076—Decoration of the case and of parts thereof, e.g. as a method of manufacture thereof
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B37/00—Cases
- G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Lighters Containing Fuel (AREA)
- Physical Vapour Deposition (AREA)
- Eyeglasses (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、メガネフレーム、時計外装品、ライ
ターケース等のチタニウムあるいはチタニウム合
金からなる装飾品における多色被膜形成方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for forming a multicolored coating on decorative articles made of titanium or titanium alloys, such as eyeglass frames, watch exteriors, and lighter cases.
従来より、チタニウムあるいはチタニウム合金
は、優れた耐食性を有し、比重が小さく、強靭性
を有しているためメガネフレーム、時計外装品、
ライターケース等の各種装飾品に使用されてい
る。
Traditionally, titanium or titanium alloys have excellent corrosion resistance, low specific gravity, and toughness, so they have been used for eyeglass frames, watch exteriors,
Used in various decorative items such as lighter cases.
ところで、前記チタニウム製の装飾品として付
加価値を増すために外表面に着色するが、一般的
には塗装、陽極酸化処理、イオンプレーテイング
処理を施すことがなされている。 Incidentally, the outer surface of the titanium decorative item is colored to increase its added value, but generally it is painted, anodized, or ion-plated.
しかし塗装による着色被膜は容易に剥離し、ま
た陽極酸化処理により生じる酸化被膜は各種発色
の干渉色を呈し、チタニウムの着色方法として有
効であるが、その着色被膜は一般的に極めて薄
く、耐摩耗性に劣るという欠点があつた。そこで
前記酸化被膜に透明樹脂のコーテイング塗装、あ
るいは硬質の透明金属の気相メツキによるコーテ
イング処理を施すことにより、酸化被膜の保護を
図つていた。 However, the colored film from painting peels off easily, and the oxide film produced by anodic oxidation exhibits various interference colors, making it an effective method for coloring titanium, but the colored film is generally extremely thin and resistant to wear. It had the disadvantage of being inferior in gender. Therefore, attempts have been made to protect the oxide film by coating the oxide film with a transparent resin or vapor-phase plating with a hard transparent metal.
しかしながら、前記コーテイング処理を施した
としても酸化被膜の保護が充分になされたとはい
えず、またコーテイング処理の作業が煩雑である
という欠点があつた。 However, even if the coating treatment was performed, it could not be said that the oxide film was sufficiently protected, and there was a drawback that the coating treatment work was complicated.
本発明は、上述した従来技術の欠点を解消し、
耐摩耗性に優れ、しかも色調の異なる多色被膜を
形成しうる方法を提供することを目的とする。
The present invention overcomes the drawbacks of the prior art mentioned above,
It is an object of the present invention to provide a method capable of forming a multicolored film having excellent abrasion resistance and different tones.
上記の目的を達成するために、本発明は、チタ
ニウムあるいはチタニウム合金からなる被処理物
の任意表面に凹部を形成し、この凹部を含めた被
処理物の処理面に陽極酸化処理を施すことにより
着色酸化被膜を形成し、その後、前記凹部の底面
部にマスキングを施し、このマスキングを施した
部分以外の着色酸化被膜上にイオンプレーテイン
グ処理を施すことにより、前記着色酸化被膜と異
なる発色の着色被膜を形成し、その後、前記マス
キングを除去するようにしたことを特徴とする。
In order to achieve the above object, the present invention forms a recess on an arbitrary surface of a workpiece made of titanium or a titanium alloy, and performs anodization treatment on the processing surface of the workpiece including the recess. By forming a colored oxide film, then masking the bottom part of the recess, and performing ion plating treatment on the colored oxide film other than the masked part, a coloring that is different from the colored oxide film can be obtained. The method is characterized in that a film is formed and then the masking is removed.
以下、本発明の一実施例を図面に基づき説明す
る。
Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図ａに示すように、チタニウムあるいはチ
タニウム合金からなる被処理物１の被処理面２に
凹部２ａを形成し、第１図ｂに示すように、凹部
２ａを含めた被処理面２に陽極酸化処理を施し、
着色酸化被膜３を形成する。 As shown in FIG. 1a, a recess 2a is formed in the surface 2 of the workpiece 1 made of titanium or titanium alloy, and as shown in FIG. 1b, the surface 2 including the recess 2a is Anodized,
A colored oxide film 3 is formed.
この陽極酸化処理の一例としては、電解質溶液
に１％デキストリン水溶液とリン酸（H2PO4）
との混合液を使用して、この電解液中でチタニウ
ムを陽極とし、白金、チタニウム、ステンレス鋼
等を陰極とし適宜の化成電圧を流す方法があげら
れる。このような処理を施すことによつて、陽極
のチタニウム表面の酸化被膜が成長し、陽極酸化
被膜が形成される。 As an example of this anodizing treatment, a 1% dextrin aqueous solution and phosphoric acid (H 2 PO 4 ) are added to the electrolyte solution.
An example of a method is to use a mixed solution of 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,0000,000,0000,000,000,000 0 By performing such treatment, an oxide film on the titanium surface of the anode grows, and an anodic oxide film is formed.
この陽極酸化被膜は化成電圧によつて異なつた
干渉色を呈する。例えば、化成電圧20Vでは紫色
の干渉色を、化成電圧50Vでは草色の干渉色を、
化成電圧70Vでは黄色の干渉色を各々呈する。 This anodic oxide film exhibits different interference colors depending on the formation voltage. For example, a formation voltage of 20V produces a purple interference color, a formation voltage of 50V produces a grass green interference color,
At a formation voltage of 70V, each exhibits a yellow interference color.
次に第１図ｃに示すように、着色酸化被膜であ
る陽極酸化被膜３が形成された凹部２ａに無機又
は有機材よりなるテープ、あるいは無機又は有機
塗料４を設けてマスキングを施す。このテープあ
るいは塗料４としては、100℃以上の高温に耐え
る耐熱性を有し、かつ10-5トール程度の高真空中
においてイオンプレーテイング処理を施す際に影
響を受けないものであることが必要である。 Next, as shown in FIG. 1c, the recess 2a where the anodic oxide film 3, which is a colored oxide film, is formed is masked by providing a tape made of an inorganic or organic material or an inorganic or organic paint 4. This tape or paint 4 must have heat resistance that can withstand high temperatures of 100°C or higher, and must not be affected by ion plating treatment in a high vacuum of about 10 -5 Torr. It is.
そして第１図ｄに示すように、前記凹部２ａの
底面部に形成された陽極酸化被膜３にて呈する発
色と異なる発色を呈する被膜５を、凹部２ａ以外
の被処理面２に形成するために、イオンプレーテ
イング処理を施す。 As shown in FIG. 1d, in order to form a coating 5 that exhibits a color different from that of the anodic oxide coating 3 formed on the bottom surface of the recess 2a, on the surface 2 to be treated other than the recess 2a. , apply ion plating treatment.
このイオンプレーテイング処理装置の一例を第
２図に示す。同図において、１０は真空槽であ
り、その中にチタニウム蒸発源１１が設けられて
いる。このチタニウム蒸発源１１はアース電位に
保たれている。チタニウム蒸発源１１の近傍には
イオン化電極１２が設けられ、このイオン化電極
１２には電源１３によつて10V〜100Vの正電圧
が印加されている。１５は真空槽１０に反応ガス
を送り込むためのパイプであり、このパイプ１５
はリーク弁１６を介してガス源（図示せず）に結
合されている。１８は真空槽１０内を排気するた
めの真空ポンプである。１９は被処理物１の保持
装置であり、この保持装置１９は真空槽１０内で
電気絶縁物２０を介して被処理物１をチタニウム
蒸発源１１と対向して保持している。前記保持装
置１９は気密機構１７によつて真空槽１０を気密
に貫通し適当な連結機構２２を介してモータ２３
に連結されている。モータ２３を駆動して被処理
物１を回転させることにより、この被処理物１に
一様な被膜が形成されるようにしている。また被
処理物１には電極２４が接触しており、電源２５
によつて０〜500Vの負電圧が印加される。２６
はシヤツタであり被膜形成時に駆動軸２７によつ
て開く。 An example of this ion plating processing apparatus is shown in FIG. In the figure, 10 is a vacuum chamber in which a titanium evaporation source 11 is provided. This titanium evaporation source 11 is kept at ground potential. An ionization electrode 12 is provided near the titanium evaporation source 11, and a positive voltage of 10V to 100V is applied to the ionization electrode 12 by a power source 13. 15 is a pipe for feeding the reaction gas into the vacuum chamber 10, and this pipe 15
is coupled to a gas source (not shown) via leak valve 16. 18 is a vacuum pump for evacuating the inside of the vacuum chamber 10. Reference numeral 19 denotes a holding device for the object 1 to be processed, and this holding device 19 holds the object 1 to be processed within the vacuum chamber 10 with an electric insulator 20 in between, facing the titanium evaporation source 11 . The holding device 19 airtightly penetrates the vacuum chamber 10 by means of an airtight mechanism 17 and is connected to a motor 23 via a suitable connection mechanism 22.
is connected to. By driving the motor 23 to rotate the object 1 to be processed, a uniform coating is formed on the object 1 to be processed. Further, an electrode 24 is in contact with the workpiece 1, and a power source 25
A negative voltage of 0 to 500V is applied. 26
A shutter is opened by a drive shaft 27 during film formation.
上記の装置で、先ず真空パンプ１８を動作させ
て真空槽１０内を10-5トール程度に排気減圧し、
電子ビームのような適当な加熱手段（図示せず）
によつて蒸発源１１のチタニウムを蒸発させる。
蒸発したチタニウムはイオン化電極１２によつて
正にイオン化される。次にリーク弁１６を開き、
真空槽１０に反応ガスとして、本実施例では酸素
を1.5×10-4〜９×10-4トールになるように供給
する。真空槽１０内に供給された酸素もイオン化
電極１２によつてある程度イオン化される。次に
モータ２３を動作させて被処理物１を回転させ且
つ電源１５によつて、この被処理物１に０〜
500Vの負電圧を与える。ここで、シヤツタ２６
を開くと、先に正にイオン化されたチタニウム蒸
気は負電圧が印加された被処理物１に大きな運動
エネルギをもつて衝突する。この衝突によつて被
処理物１の極く薄い部分は最高で400℃程度に加
熱され、この加熱された表面でチタニウム蒸気は
酸素と反応する。これによつて被処理物１の表面
には濃青色の酸化チタニウムの着色被膜５が形成
される。 In the above device, first operate the vacuum pump 18 to exhaust and reduce the pressure inside the vacuum chamber 10 to about 10 -5 Torr.
suitable heating means such as an electron beam (not shown)
The titanium in the evaporation source 11 is evaporated.
The evaporated titanium is positively ionized by the ionization electrode 12. Next, open the leak valve 16,
In this embodiment, oxygen is supplied to the vacuum chamber 10 as a reaction gas at a concentration of 1.5×10 −4 to 9×10 −4 Torr. Oxygen supplied into the vacuum chamber 10 is also ionized to some extent by the ionization electrode 12. Next, the motor 23 is operated to rotate the workpiece 1, and the power supply 15 is applied to the workpiece 1 from zero to
Give a negative voltage of 500V. Here, shutter 26
When opened, the positively ionized titanium vapor collides with large kinetic energy against the workpiece 1 to which a negative voltage has been applied. This collision heats the extremely thin part of the object 1 to a maximum of about 400° C., and the titanium vapor reacts with oxygen on this heated surface. As a result, a dark blue colored coating 5 of titanium oxide is formed on the surface of the object 1 to be treated.
上述したイオンプレーテイング処理による着色
被膜５は、公知のように反応ガス、処理条件によ
つて、その発色を異ならせることができる。 As is well known, the colored film 5 formed by the above-mentioned ion plating treatment can have different colors depending on the reaction gas and treatment conditions.
このようなイオンプレーテイング処理を施した
後、第１図ｅに示すように、前記マスキング用の
テープあるいは塗料４を凹部２ａより剥離する。
すると、例えば被処理物１の主体となる部分にお
いてイオンプレーテイング処理による濃青色を呈
し、凹部２ａでは陽極酸化被膜３の黄色を呈する
ようになり、被処理物１上に異なつた色彩が任意
に現出できる。 After performing such ion plating treatment, as shown in FIG. 1e, the masking tape or paint 4 is peeled off from the recess 2a.
Then, for example, the main part of the object 1 to be treated takes on a dark blue color due to the ion plating treatment, and the concave portions 2a take on the yellow color of the anodic oxide film 3, and different colors can be arbitrarily applied to the object 1 to be treated. It can appear.
前記イオンプレーテイング処理による酸化チタ
ニウムの被膜の硬度は、マイクロビツカース硬度
で800Kg/mm2程度になる。ところが陽極酸化被膜自
体の耐摩耗性は劣るが、凹部２ａの底面部に酸化
被膜３を形成することにより、外物との接触が防
止され、実使用には問題はない。また酸化被膜３
と、イオンプレーテイング処理による着色被膜５
との密着性も良好であつた。そして、上述のよう
なイオンプレーテイング処理と陽極酸化処理との
異なつた処理による特異な発色を現出できるた
め、装飾品としての付加価値を高めることができ
る。 The hardness of the titanium oxide film obtained by the ion plating treatment is about 800 Kg/mm 2 in terms of micro-Vickers hardness. However, although the anodic oxide film itself has poor wear resistance, by forming the oxide film 3 on the bottom surface of the recess 2a, contact with external objects is prevented, and there is no problem in actual use. Also, oxide film 3
and colored film 5 by ion plating treatment.
Adhesion with the material was also good. Further, since a unique color can be produced by the different treatments such as the above-mentioned ion plating treatment and anodizing treatment, the added value as a decorative item can be increased.
〔発明の効果〕
本発明は、上述のごとく構成してなり、チタニ
ウムあるいはチタニウム合金からなる装飾品に、
陽極酸化とイオンプレーテイングによる異なつた
発色による多色被膜が形成でき、しかも耐摩耗性
に優れた装飾品における多色被膜形成方法を提供
できる。[Effects of the Invention] The present invention is configured as described above, and is applied to an ornament made of titanium or a titanium alloy.
It is possible to provide a method for forming a multicolored coating on a decorative article, which can form a multicolored coating with different colors developed by anodic oxidation and ion plating, and has excellent wear resistance.
第１図ａ、第１図ｂ、第１図ｃ、第１図ｄ、第
１図ｅは本発明の工程を説明するための図、第２
図はイオンプレーテイング処理装置の一例を概略
説明するための断面図である。
１…被処理物、２…被処理面、２ａ…凹部、３
…陽極酸化による着色酸化被膜、４…マスキング
材、５…イオンプレーテイング処理による着色被
膜。
Figure 1a, Figure 1b, Figure 1c, Figure 1d, Figure 1e are diagrams for explaining the process of the present invention, Figure 2
The figure is a sectional view for schematically explaining an example of an ion plating processing apparatus. DESCRIPTION OF SYMBOLS 1... Object to be treated, 2... Surface to be treated, 2a... Recess, 3
...Colored oxide film by anodic oxidation, 4. Masking material, 5. Colored film by ion plating treatment.
Claims (1)
被処理物の任意表面に凹部を形成し、この凹部を
含めた被処理物の処理面に陽極酸化処理を施すこ
とにより着色酸化被膜を形成し、その後、前記凹
部の底面部にマスキングを施し、このマスキング
を施した部分以外の着色酸化被膜上にイオンプレ
ーテイング処理を施すことにより、前記着色酸化
被膜と異なる発色の着色被膜を形成し、その後、
前記マスキングを除去するようにした装飾品にお
ける多色被膜形成方法。1. A recess is formed on any surface of a workpiece made of titanium or a titanium alloy, and a colored oxide film is formed by anodizing the surface of the workpiece including the recess, and then the recess is Masking is applied to the bottom part, and ion plating treatment is performed on the colored oxide film other than the masked part to form a colored film with a different color from the colored oxide film, and then,
A method for forming a multicolor film on a decorative article, the method comprising removing the masking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21051685A JPS6270599A (en) | 1985-09-24 | 1985-09-24 | Formation of multi-color film on ornamental articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21051685A JPS6270599A (en) | 1985-09-24 | 1985-09-24 | Formation of multi-color film on ornamental articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6270599A JPS6270599A (en) | 1987-04-01 |
| JPS644599B2 true JPS644599B2 (en) | 1989-01-26 |
Family
ID=16590662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21051685A Granted JPS6270599A (en) | 1985-09-24 | 1985-09-24 | Formation of multi-color film on ornamental articles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6270599A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04128194U (en) * | 1991-05-17 | 1992-11-24 | 住友ゴム工業株式会社 | cutter |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6478218A (en) * | 1987-09-18 | 1989-03-23 | Namiki Precision Jewel Co Ltd | Production of spectacle frame made of two-tone color metal |
| JPH0250984A (en) * | 1988-08-15 | 1990-02-20 | Jibako:Kk | Production of gold lacquer ware-like product |
| JPH02118062A (en) * | 1988-10-26 | 1990-05-02 | Kawasaki Steel Corp | Manufacture of colored ceramic coated steel sheet |
| JPH02254415A (en) * | 1989-03-29 | 1990-10-15 | Oputo Meiku Fukui:Kk | Manufacture of multicolor spectacles frame |
| JPH0633122U (en) * | 1992-09-30 | 1994-04-28 | 青山眼鏡株式会社 | Eyeglass frame |
| JP3865268B2 (en) * | 1995-12-26 | 2007-01-10 | 洋一 村山 | Multicolor pattern formation method on product surface |
| KR100648934B1 (en) | 2004-11-08 | 2006-11-28 | 장두정 | Manufacturing method of rainbow coating film |
| CN105862106B (en) * | 2016-05-26 | 2018-05-18 | 大博医疗科技股份有限公司 | A kind of preparation method of the double-colored film layer in titanium or titanium alloy surface |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5541315A (en) * | 1978-09-14 | 1980-03-24 | Fuji Electric Co Ltd | Apparatus for preventing cavitation in boiler water feed pump |
-
1985
- 1985-09-24 JP JP21051685A patent/JPS6270599A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04128194U (en) * | 1991-05-17 | 1992-11-24 | 住友ゴム工業株式会社 | cutter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6270599A (en) | 1987-04-01 |
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