JPS6268571A - Method for coating surfaces of metal parts - Google Patents
Method for coating surfaces of metal partsInfo
- Publication number
- JPS6268571A JPS6268571A JP20987185A JP20987185A JPS6268571A JP S6268571 A JPS6268571 A JP S6268571A JP 20987185 A JP20987185 A JP 20987185A JP 20987185 A JP20987185 A JP 20987185A JP S6268571 A JPS6268571 A JP S6268571A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hole
- ceramic slurry
- spray
- compressed air
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 9
- 238000000576 coating method Methods 0.000 title claims description 15
- 239000011248 coating agent Substances 0.000 title claims description 13
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 238000007592 spray painting technique Methods 0.000 claims abstract description 7
- 239000011344 liquid material Substances 0.000 claims abstract 3
- 239000007788 liquid Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 15
- 239000007921 spray Substances 0.000 abstract description 12
- 230000000873 masking effect Effects 0.000 abstract description 8
- 239000011247 coating layer Substances 0.000 abstract description 6
- 230000000704 physical effect Effects 0.000 abstract description 2
- 238000010422 painting Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は金属部品表面の被覆方法に関し、例えばディー
ゼルエンジン用の燃料噴射ノズル等をセラミックスラリ
−で被覆する方法に適用して特に好適なものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of coating the surface of metal parts, and is particularly suitable for application to a method of coating fuel injection nozzles for diesel engines, etc. with ceramic slurry, for example. It is.
本発明は、被覆される面に貫通孔を有する金属部品表面
の上記貫通孔以外の部分を液状体の吹きつけ塗装によっ
て被覆する方法において、上記被覆される面とは反対の
側から上記貫通孔に圧縮ガスを供給し、上記液状体の吹
きつけ圧力よりも低い圧力で上記圧縮ガスを上記貫通孔
に通しながら上記液状体の吹きつけ塗装を行うことによ
り、
簡単且つ確実な方法で上記貫通孔部分をマスキングする
ものである。The present invention provides a method for coating a part of a surface of a metal component having a through hole on a surface to be coated other than the through hole by spray painting with a liquid, in which the through hole is applied from the side opposite to the surface to be coated. By supplying compressed gas to the through hole and spraying the liquid while passing the compressed gas through the through hole at a pressure lower than the spraying pressure of the liquid, the through hole can be sprayed in a simple and reliable manner. This is to mask the part.
被覆される面に貫通孔を有する部品表面の貫通孔以夕（
の部分に、液状体の吹きつけ塗装により被覆を施す場合
、従来は、貫通孔部分に粘着テープを貼付したり、適当
なピンを貫通孔に埋設したりしてマスキングしていた。Through-holes on the surface of parts that have through-holes on the surface to be coated (
When coating the area by spray painting with a liquid, conventional masking was done by pasting adhesive tape on the through-hole area or embedding an appropriate pin in the through-hole.
しかしながら、例えばディーゼルエンジン用の燃料噴射
ノズルのように、貫通孔の径が小さかったり、数が多い
場合には、上述のようなマスキング法では生産効率が悪
かった。However, when the diameter of the through holes is small or the number of through holes is large, such as in a fuel injection nozzle for a diesel engine, the above masking method has poor production efficiency.
その上、粘着テープを用いる方法では、必然的に孔の周
辺部分もマスクされてしまうので、その部分が被覆され
ないという問題もあった。又、ピンでマスキングする場
合には、セラミックスラリ−等の液状体を塗布した後、
ピンを取り除くときに、孔の周囲の被覆層がピンに付着
してはがれてしまうことがあった。Furthermore, in the method using adhesive tape, the surrounding area of the hole is also necessarily masked, so there is a problem that this area is not covered. In addition, when masking with pins, after applying a liquid such as ceramic slurry,
When removing the pin, the coating layer around the hole sometimes adhered to the pin and peeled off.
なお、貫通孔にマスキングを施さずに吹きつけ塗装を行
い、その後で、貫通孔部分の被覆層のみを例えば機械加
工によって除去することも可能であるが、その場合には
、その加工作業が非常に面倒であり、生産性も悪くなっ
てしまう。又加工時に、所望部分の被覆層を傷つけたり
、はく離させたりする恐れもある。It is also possible to spray paint the through-hole without masking and then remove only the coating layer in the through-hole area by, for example, machining, but in that case, the machining work would be extremely difficult. This is troublesome and reduces productivity. Furthermore, during processing, there is a risk that the coating layer in desired areas may be damaged or peeled off.
本発明は上述の問題点に鑑みてなされたものであって、
被覆される面に貫通孔を有する金属部品表面の上記貫通
孔以外の部分を液状体の吹きつけ塗装によって被覆する
方法において、上記被覆される面とは反対の側から上記
貫通孔に圧縮ガスを供給し、上記液状体の吹きつけ圧力
よりも低い圧力で上記圧縮ガスを上記貫通孔に通しなが
ら上記液状体の吹きつけ塗装を行うものである。The present invention has been made in view of the above-mentioned problems, and includes:
In a method of coating the surface of a metal part having a through hole on the surface to be coated other than the through hole by spray painting with a liquid, compressed gas is applied to the through hole from the side opposite to the surface to be coated. The compressed gas is supplied through the through hole at a pressure lower than the spraying pressure of the liquid, and the liquid is sprayed.
以下、ディーゼルエンジン用燃料噴射ノズルをセラミッ
クスラリ−で被覆する方法に本発明を適用した実施例に
つき添付図面を参照して説明する。EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a method of coating a fuel injection nozzle for a diesel engine with ceramic slurry will be described with reference to the accompanying drawings.
第１図及び第２図に示すように、鋳鉄製の燃料噴射ノズ
ル１は、その全体がはｙ゛円柱状に構成されている。ノ
ズル１の中心部には中空部２が設けられており、この中
空部２はノズル１の後端面３に開口している。一方、ノ
ズル１の先端部には複数の噴出口４が設けられており、
これらの噴出口４は貫通孔４０を通じて中空部２に連通
している。As shown in FIGS. 1 and 2, the cast iron fuel injection nozzle 1 has a cylindrical shape as a whole. A hollow portion 2 is provided in the center of the nozzle 1, and this hollow portion 2 opens to a rear end surface 3 of the nozzle 1. On the other hand, a plurality of jet ports 4 are provided at the tip of the nozzle 1,
These jet ports 4 communicate with the hollow portion 2 through through holes 40 .
特にディーゼルエンジンの場合には低質の燃料が使用さ
れるために、この燃料に含有されている硫黄によって腐
食性の強い硫酸が生成され、この結果、ノズル１の外表
面に腐食が発生して、この外表面が著しい損傷を受は易
い。Particularly in the case of diesel engines, since low-quality fuel is used, the sulfur contained in this fuel generates highly corrosive sulfuric acid, resulting in corrosion on the outer surface of the nozzle 1. This outer surface is susceptible to significant damage.
そこで、このような腐食損傷を避けるために、耐食性に
優れたセラミック（例えば、アルミナ、シリカ及びクロ
ミアの複合セラミック）でノズルｌの外表面を被覆する
ことが行われている。Therefore, in order to avoid such corrosion damage, the outer surface of the nozzle l is coated with a ceramic having excellent corrosion resistance (for example, a composite ceramic of alumina, silica, and chromia).
このような被覆を施す場合、従来は、ノズル１の噴出口
４の部分を粘着テープで覆ったり、噴出口４に適当なピ
ンを嵌め込んでマスキングしていた。ところが、このよ
うな燃料噴射ノズル１の噴出口４はその口径が約０．８
龍と小さいために、上記のようなマスキング方法ではそ
の作業が非常に厄介であり、又既述したような種々の問
題点もあった。When applying such a coating, conventionally, the spout 4 of the nozzle 1 has been covered with an adhesive tape or a suitable pin has been inserted into the spout 4 for masking. However, the diameter of the jet port 4 of such a fuel injection nozzle 1 is approximately 0.8.
Due to the small size of the dragon, the masking method described above is very troublesome, and there are also various problems as described above.
そこで本実施例においては、下記のようにして被覆を行
う。Therefore, in this embodiment, the coating is performed as follows.
まず、第１図に示すように、燃料噴出ノズル１の中空部
２にその後端開口４１がら圧縮空気５を供給する。そし
てこの圧縮空気５を噴出口４がら噴出させながら、噴出
ノズル１を数十回７分で回転させ、スプレー６からセラ
ミックスラリ−７を吹きつけて塗装する。First, as shown in FIG. 1, compressed air 5 is supplied to the hollow part 2 of the fuel injection nozzle 1 through the rear end opening 41. As shown in FIG. Then, while blowing out this compressed air 5 from the blow-off port 4, the blow-out nozzle 1 is rotated several tens of times in 7 minutes, and the ceramic slurry 7 is sprayed from the spray 6 for coating.
適当な圧縮空気の圧力は、セラミックスラリ−のスプレ
ー圧によって決まる。一方、セラミックスラリ−のスプ
レー圧は、このセラミックスラリ−の粘度等の物性によ
って決まり、略１〜２ｋｇ ／ ｃｒＡである。そして
噴出口４における圧縮空気の圧力は、このセラミックス
ラリ−のスプレー圧よりも低い圧力である必要がある。The appropriate compressed air pressure will depend on the spray pressure of the ceramic slurry. On the other hand, the spray pressure of the ceramic slurry is determined by the physical properties of the ceramic slurry, such as its viscosity, and is approximately 1 to 2 kg/crA. The pressure of the compressed air at the jet nozzle 4 must be lower than the spray pressure of the ceramic slurry.
そうでないと、塗布されるセラミックスラリ−がこの圧
縮空気によって飛敗してしまう。Otherwise, the applied ceramic slurry will be blown away by this compressed air.
噴出口４における圧縮空気の圧力は、セラミックスラリ
−のスプレー圧の約１／３〜１／２、従って約０．３〜
ｌ ｋｇ ／ ｃｎｆであるのが好ましい。この圧縮空
気の圧力が０．３ ｋｇ／ｃｏｔ未満だと、第３Ａ図に
示すように、被覆層８が貫通孔４０内に垂れ込んでしま
う恐れがあり、一方、ｌ ｋｇ ／ ｃｎｌを越えると
、第３Ｂ図に示すように、セラミックスラリ−が飛敗し
てしまって噴出口４付近の被覆が不充分になる恐れがあ
る。The pressure of the compressed air at the jet nozzle 4 is about 1/3 to 1/2 of the spray pressure of the ceramic slurry, and therefore about 0.3 to 1/2.
Preferably, it is l kg/cnf. If the pressure of this compressed air is less than 0.3 kg/cot, there is a risk that the coating layer 8 will sag into the through hole 40, as shown in FIG. 3A, whereas if it exceeds l kg/cnl, As shown in FIG. 3B, there is a risk that the ceramic slurry will fly off and the coating around the spout 4 will be insufficient.
次に、より具体的な実施例について説明する。Next, a more specific example will be described.
セラミックスラリ−として、アルミナ粉末１０重足％、
シリカ粉末５５重量％、クロム酸１０重星％、水２５重
世％からなる粘度１００００ ｃｐの混合物を用い、第
１図に示す方法で燃料噴射ノズルｌの被覆を行った。As a ceramic slurry, 10% alumina powder,
A fuel injection nozzle 1 was coated by the method shown in FIG. 1 using a mixture having a viscosity of 10,000 cp and consisting of 55% by weight of silica powder, 10% by weight of chromic acid, and 25% by weight of water.
セラミックスラリ−のスプレー圧は１．５ ｋｇ／ｓｎ
ｌ、圧縮空気の噴出圧は０．６ ｋｇ／ｃｕｔであった
。又スプレー距；雛は約３０ｃｍであった。The spray pressure of ceramic slurry is 1.5 kg/sn
1, the blowing pressure of compressed air was 0.6 kg/cut. Also, the spray distance was approximately 30 cm for chicks.
セラミックスラリ−の被覆層８の厚さは約０．１〜０．
２龍で、この厚さが得られた後、圧縮空気の噴出及び噴
射ノズル１の回転はそのままにして、約５１０°Ｃぐら
いの温度で焼付けを行い、アルミナ、シリカ及びクロミ
アからなる複合セラミックの被覆を形成した。The thickness of the ceramic slurry coating layer 8 is approximately 0.1 to 0.
After this thickness is obtained with the 2-Dragon, the compressed air jet and the rotation of the jet nozzle 1 are left unchanged and baked at a temperature of approximately 510°C to form a composite ceramic made of alumina, silica, and chromia. A coating was formed.
なお、上記実施例においては、ディーゼルエンジン用の
燃料噴射ノズルをセラミックスラリ−で被覆する場合に
ついて説明したが、本発明は、貫通孔を有するパイプ状
等の種々の金属部品を液状体の吹きつけ塗装により被覆
する方法に適用が可能である。In the above embodiment, a case has been described in which a fuel injection nozzle for a diesel engine is coated with ceramic slurry, but the present invention can coat various metal parts such as pipe-shaped parts having through holes with a liquid by spraying the fuel injection nozzle with ceramic slurry. It can be applied to a coating method.
又、圧縮ガスとしては、圧縮空気以外の種々のガスが用
いられて良い。Moreover, various gases other than compressed air may be used as the compressed gas.
本発明においては、金属部品の貫ｊｍ孔から圧縮ガスを
吹き出させながら液状体の吹きつけ塗装を行っているの
で、この貫通孔部分のみの効果的なマスキングが達成さ
れる。In the present invention, spray painting with a liquid is performed while blowing out compressed gas from the through-hole of the metal component, so effective masking of only the through-hole portion can be achieved.
しかも本発明の方法は、作業性に優れており、大型生産
に適している。Furthermore, the method of the present invention has excellent workability and is suitable for large-scale production.
第１図は本発明の一実施例による被覆方法の概略断面図
、第２図は燃料噴射ノズルの外観斜視図、第３Ａ図及び
第３Ｂ図は貫通孔部分の拡大断面図である。
なお図面に用いた符号において、
１−一−−−−・−一−−−−−−燃料噴射ノズル４
−−一−−−−−−−−−−−−噴出口７−−−一−−
−−−−−−セラミックスラリ−８−−−−−一−−−
−−−−−−被覆層４０−−−−−−−−−−−−−−
−貫通孔である。FIG. 1 is a schematic sectional view of a coating method according to an embodiment of the present invention, FIG. 2 is an external perspective view of a fuel injection nozzle, and FIGS. 3A and 3B are enlarged sectional views of a through hole portion. In addition, in the symbols used in the drawings, 1-1-------1-------Fuel injection nozzle 4
---1------------ Spout port 7---1--
−−−−−−Ceramic slurry−8−−−−−1−−−
---------Covering layer 40---------------------
- It is a through hole.
Claims (1)
貫通孔以外の部分を液状体の吹きつけ塗装によって被覆
する方法において、 上記被覆される面とは反対の側から上記貫通孔に圧縮ガ
スを供給し、 上記液状体の吹きつけ圧力よりも低い圧力で上記圧縮ガ
スを上記貫通孔に通しながら上記液状体の吹きつけ塗装
を行うことを特徴とする方法。 ２、上記液状体の吹きつけ圧力の１／３〜１／２の圧力
で上記圧縮ガスを上記貫通孔に通すことを特徴とする特
許請求の範囲第１項に記載の方法。 ３、上記金属部品が内燃機関用の部品であり、上記液状
体がセラミックスラリーであることを特徴とする特許請
求の範囲第１項又は第２項に記載の方法。[Claims] 1. In a method of coating a part of the surface of a metal component having a through-hole on the surface to be coated other than the through-hole by spray painting with a liquid, the side opposite to the surface to be coated A method characterized by: supplying compressed gas to the through-hole from above, and performing spray painting with the liquid while passing the compressed gas through the through-hole at a pressure lower than the spraying pressure of the liquid. 2. The method according to claim 1, wherein the compressed gas is passed through the through hole at a pressure that is 1/3 to 1/2 of the blowing pressure of the liquid. 3. The method according to claim 1 or 2, wherein the metal part is a part for an internal combustion engine, and the liquid material is a ceramic slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20987185A JPS6268571A (en) | 1985-09-21 | 1985-09-21 | Method for coating surfaces of metal parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20987185A JPS6268571A (en) | 1985-09-21 | 1985-09-21 | Method for coating surfaces of metal parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6268571A true JPS6268571A (en) | 1987-03-28 |
Family
ID=16580017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20987185A Pending JPS6268571A (en) | 1985-09-21 | 1985-09-21 | Method for coating surfaces of metal parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6268571A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360634A (en) * | 1988-12-05 | 1994-11-01 | Adiabatics, Inc. | Composition and methods for densifying refractory oxide coatings |
| JP2006090414A (en) * | 2004-09-22 | 2006-04-06 | Toshiba Corp | Sliding valve device and its manufacturing method |
| KR100591272B1 (en) | 2005-11-21 | 2006-06-19 | 제갈훈 | Coating method for covering the flaw on the light metal mold |
| JP2007209228A (en) * | 2006-02-08 | 2007-08-23 | Shimano Inc | Lure |
| JP2008168166A (en) * | 2007-01-05 | 2008-07-24 | Hitachi Ltd | Method and apparatus for forming coating film comprising liquid material |
| JP2009233510A (en) * | 2008-03-26 | 2009-10-15 | Akebono Brake Ind Co Ltd | Supporting device for coating, support for coating, and coating method |
-
1985
- 1985-09-21 JP JP20987185A patent/JPS6268571A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360634A (en) * | 1988-12-05 | 1994-11-01 | Adiabatics, Inc. | Composition and methods for densifying refractory oxide coatings |
| JP2006090414A (en) * | 2004-09-22 | 2006-04-06 | Toshiba Corp | Sliding valve device and its manufacturing method |
| US7849874B2 (en) | 2004-09-22 | 2010-12-14 | Kabushiki Kaisha Toshiba | Slide valve apparatus and method of manufacturing slide valve apparatus |
| KR100591272B1 (en) | 2005-11-21 | 2006-06-19 | 제갈훈 | Coating method for covering the flaw on the light metal mold |
| JP2007209228A (en) * | 2006-02-08 | 2007-08-23 | Shimano Inc | Lure |
| JP2008168166A (en) * | 2007-01-05 | 2008-07-24 | Hitachi Ltd | Method and apparatus for forming coating film comprising liquid material |
| JP2009233510A (en) * | 2008-03-26 | 2009-10-15 | Akebono Brake Ind Co Ltd | Supporting device for coating, support for coating, and coating method |
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