JPH0585222B2 - - Google Patents
Info
- Publication number
- JPH0585222B2 JPH0585222B2 JP12894885A JP12894885A JPH0585222B2 JP H0585222 B2 JPH0585222 B2 JP H0585222B2 JP 12894885 A JP12894885 A JP 12894885A JP 12894885 A JP12894885 A JP 12894885A JP H0585222 B2 JPH0585222 B2 JP H0585222B2
- Authority
- JP
- Japan
- Prior art keywords
- plasma
- gas
- flame
- thermal spraying
- plasma flame
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 21
- 238000007751 thermal spraying Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 9
- 238000007750 plasma spraying Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、層流プラズマ発主トーチを利用し
たプラズマ溶射装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a plasma spraying apparatus using a laminar flow plasma generating torch.
層流プラズマ発生トーチを利用した従来のプラ
ズマ溶射装置は、その層流プラズマ発生トーチの
プラズマ炎の出口付近に、溶射用材料供給管をの
ぞかせたものであつて、その溶射用材料供給管か
ら連続的に供給された溶射用材料をプラズマ炎に
より加熱溶融し、処理対象物に到達させるもので
ある。
A conventional plasma spraying apparatus using a laminar flow plasma generation torch has a thermal spraying material supply pipe peeking out near the plasma flame exit of the laminar flow plasma generation torch, and a continuous flow from the thermal spraying material supply pipe. The material for thermal spraying is heated and melted by a plasma flame, and the material is delivered to the object to be treated.
層流プラズマ溶射装置ではプラズマ炎の長さが
300mm〜400mmにも達し、飛行距離の増加に伴い、
溶融材料の飛行速度が低下するので、長距離の飛
行の後に、処理対象物２１に吹き付けるのは、良
好な被膜を絵付け事が出来ない。
In laminar flow plasma spray equipment, the length of the plasma flame is
It reaches 300mm to 400mm, and as the flight distance increases,
Since the flight speed of the molten material is reduced, spraying it onto the object 21 after a long flight does not provide a good coating.
この発明の目的は、層流プラズマ溶射装置に於
いて、該装置のプラズマ炎中で加熱され、液滴と
なつて処理対象物に向つて飛行する溶射用材料か
ら、処理対象物の直前でプラズマを分離して、溶
融した溶射用材料を極めて短い飛行距離の後に、
直ちに処理対象物の表面に吹き付け、比較的遅い
飛行速度でも性能の良い溶射被膜を発生させるこ
とである。 An object of the present invention is to provide a laminar flow plasma spraying apparatus in which a thermal spraying material that is heated in the plasma flame of the apparatus and flies in the form of droplets toward the object to be treated, generates a plasma immediately before the object to be treated. After a very short flight distance, the molten thermal spray material is
The purpose is to immediately spray the surface of the object to be treated and generate a thermally sprayed coating with good performance even at relatively slow flight speeds.
本発明は層流プラズマ発生トーチのプラズマ炎
の出口付近に、溶射用材料を供給するための溶射
用材料供給管をのぞませ、その溶射用材料の液滴
の混入せるプラズマ炎に於ける処理対象物の直前
に、そのプラズマを分離するための分離手段を設
けたものである。
The present invention provides a thermal spraying material supply pipe for supplying thermal spraying material near the exit of the plasma flame of a laminar flow plasma generation torch, and processes in the plasma flame in which droplets of the thermal spraying material are mixed. A separation means for separating the plasma is provided immediately in front of the object.
層流プラズマ発生トーチのプラズマの出口から
噴出する層流プラズマ炎に、その出口付近に設け
られた溶射用材料供給管から、溶射用材料を供給
し、それを上記プラズマ炎で加熱して液滴とし、
これをプラズマ炎中に混入した状態で、被塗物に
向けて飛行させる。
A thermal spraying material is supplied from a thermal spraying material supply pipe installed near the exit to the laminar plasma flame ejected from the plasma outlet of the laminar plasma generation torch, and the material is heated by the plasma flame to form droplets. year,
This is mixed into a plasma flame and is flown toward the object to be coated.
このプラズマ炎が被塗物に到達する直前で、プ
ラズマをその分離装置によつて、気体流を作用さ
せて除去し、溶射用材料の液滴のみを被塗物に到
達させて、これに付着するものである。 Immediately before this plasma flame reaches the object to be coated, the plasma is removed by the separation device using a gas flow, allowing only the droplets of the thermal spraying material to reach the object and adhere to it. It is something to do.
第１図は、本発明による、処理対象物２１の直
前でプラズマ１８だけを分離して、溶融して液滴
１９となつた溶射用材料を吹き付けるという、プ
ラズマ分離装置２２の最も基本的な構成より成る
実施例である。
FIG. 1 shows the most basic configuration of a plasma separation device 22 according to the present invention, which separates only the plasma 18 immediately before the object to be treated 21 and sprays the thermal spray material that has been melted into droplets 19. This is an example consisting of the following.
プラズマ分離手段は、種々のものが可能である
が、最も簡単なものは、本図に示すような気体給
気口２３であつて、これから矢印２４に示された
如く、プラズマ炎１５に交叉して気体を送入す
る。この気体の量を適切に選定する事によつて、
溶融した溶射用材料の液滴１９を含むプラズマ炎
１５の中からプラズマ１８のみが分離され、しか
も溶融状態にある溶射用材料は、殆んど冷却され
ずに、その直後に処理対象物２１に衝突して、良
好な被膜２０を形成する。 Various types of plasma separation means are possible, but the simplest one is a gas supply port 23 as shown in this figure, which crosses the plasma flame 15 as shown by the arrow 24. to supply gas. By appropriately selecting the amount of this gas,
Only the plasma 18 is separated from the plasma flame 15 containing the droplets 19 of the molten thermal spraying material, and the molten thermal spraying material is immediately transferred to the object 21 without being cooled down. They collide to form a good coating 20.
その他の手段としては、処理対象物２１の直線
で、気体排気口２５によつて矢印２６に示された
如く排気を行う事によつて、プラズマ１８を分離
し、処理対象物２１の損傷を防ぐ事も可能であ
り、又、給気と排気を併用する事によつてプラズ
マ１８を分離することも可能である。 Another method is to separate the plasma 18 and prevent damage to the object 21 by evacuating the object 21 in a straight line as shown by the arrow 26 through the gas exhaust port 25. It is also possible to separate the plasma 18 by using air supply and exhaust in combination.
以上の事は、プラズマ炎１５の中心軸に対して
直角方向に給気、排気を行うものであるが、必ず
しも直角方向に給排気するだけでなく、プラズマ
炎の進行方向に関して、ある角度を持たせて実施
する方が有効な場合もある。これは、プラズマ炎
の大きさでプラズマガス量等によつて決定され
る。 In the above, air is supplied and exhausted in a direction perpendicular to the central axis of the plasma flame 15, but the air is not necessarily supplied and exhausted at right angles, but at a certain angle with respect to the traveling direction of the plasma flame. In some cases, it may be more effective to do so at the same time. This is determined by the size of the plasma flame and the amount of plasma gas.
第１図に図示された陰極１はその先端が陽極ノ
ズル２と同心的に保持されており、その上流には
プラズマ送入口７よりプラズマガス８が送入され
るようになつている。 The tip of the cathode 1 shown in FIG. 1 is held concentrically with the anode nozzle 2, and a plasma gas 8 is introduced from a plasma inlet 7 upstream thereof.
電源３の負側は導線５で陰極１に結合されてお
り、又電源３の正側は起動用高周波電源４を介し
て、導線６で陽極ノズル２に結合されている。 The negative side of the power source 3 is connected to the cathode 1 through a conductive wire 5, and the positive side of the power source 3 is connected to the anode nozzle 2 through a conductive wire 6 via a high frequency power source 4 for starting.
陽極ノズル２の内部は図示してないが、二重構
造になつていて、その内部と冷却システム１２と
を配管１３，１４で連通し、冷却水等で常時冷却
するようになつている。 Although the inside of the anode nozzle 2 is not shown, it has a double structure, and the inside is communicated with the cooling system 12 through pipes 13 and 14, so that it is constantly cooled with cooling water or the like.
プラズマガス送入口７より陽極ノズル２内に、
プラズマガス８を流し、且つ電源３により、陰極
１と陽極ノズル２との間に直流電圧を印加しなが
ら、起動用高周波電源４によつて高周波電源を印
加し、陰極１の先端から陽極ノズル２の内面に向
かつてアーク１０を発生させると、前述のプラズ
マガスはプラズマ１８となり、その全体がプラズ
マ炎１５となつて陽極ノズル２の先端から噴出す
る。 From the plasma gas inlet 7 into the anode nozzle 2,
While flowing the plasma gas 8 and applying a DC voltage between the cathode 1 and the anode nozzle 2 using the power source 3, a high frequency power source is applied using the starting high frequency power source 4, and a high frequency power is applied from the tip of the cathode 1 to the anode nozzle 2. When the arc 10 is generated toward the inner surface of the anode nozzle 2, the plasma gas described above becomes a plasma 18, and the entire plasma becomes a plasma flame 15 and is ejected from the tip of the anode nozzle 2.
この際、溶射材料１７をその供給管１６から供
給すると、瞬間的に溶融して液滴１９となり、プ
ラズマ炎１５中に混入した状態で処理対象物２１
に向かつて飛行する。 At this time, when the thermal spray material 17 is supplied from the supply pipe 16, it instantly melts into droplets 19, which are mixed into the plasma flame 15 and placed on the object to be treated 2.
Fly towards.
この液滴１９を含むプラズマ炎１５は、処理対
象物２１の直前に設けられたプラズマ分離装置２
２によつて、プラズマ１８のみが分離され、その
直後に、液滴１９が処理対象物２１に衝突して、
これに付着し、強固な被膜２０を形成する。 The plasma flame 15 containing the droplets 19 is transferred to a plasma separation device 2 provided immediately before the object 21 to be treated.
2, only the plasma 18 is separated, and immediately after that, the droplet 19 collides with the object to be processed 21,
It adheres to this and forms a strong film 20.
該プラズマ分離装置２２は気体給気口２３と気
体排気口２５を具備し、これから夫々プラズマ分
離用給気２４を給気とすると共にプラズマガス分
離用排気２６を排気するようにしてある。 The plasma separation device 22 is equipped with a gas supply port 23 and a gas exhaust port 25, from which the plasma separation gas supply air 24 is supplied and the plasma gas separation gas 26 is exhausted.
又、第３図に示した如く、プラズマ分離用給気
２４を処理対象物２１に接近して設もけられたプ
ラズマ分離用給気環状室２７に一旦送り込み、こ
れからプラズマ炎１５の縦面図の外周に対して接
線方向の成分を有する給気口２９を通して、プラ
ズマ炎１５の外周の部分にプラズマ分離作用が有
効に行なわれる様プラズマ分離用給気２４を吹き
込むと有効な場合があり、これは特に、プラズマ
炎１５の外周の部分の溶融温度の低い溶射用材料
の液滴や末溶融の溶射用材料をプラズマと共に分
離するのに好適である。この場合、給気口２９の
下流にプラズマ分離用排気環状室２８を設け、ス
リツトを通してこの環状室によつて矢印２６に示
した如く、排気を行う事によつて、未溶融の溶射
用材料等を系外に排出することなく運転をする事
もできる。 Further, as shown in FIG. 3, the supply air 24 for plasma separation is once sent into the annular supply air chamber 27 for plasma separation, which is provided close to the object 21 to be processed, and then a longitudinal view of the plasma flame 15 is shown. It may be effective to blow the plasma separation supply air 24 into the outer circumference of the plasma flame 15 through the air supply port 29, which has a component in a tangential direction to the outer circumference of the plasma flame 15, so that the plasma separation effect is effectively performed. This method is particularly suitable for separating droplets of thermal spray material having a low melting temperature and partially melted thermal spray material in the outer peripheral portion of the plasma flame 15 together with the plasma. In this case, an exhaust annular chamber 28 for plasma separation is provided downstream of the air supply port 29, and by evacuating the annular chamber through a slit as shown by the arrow 26, unmelted thermal spraying material can be removed. It is also possible to operate the system without discharging it outside the system.
この発明の実施の態様は、先に述べた第１図、
第３図の実施例だけに限定されるものではなく、
この発明の技術思想に基づく多くの実施態様が可
能である。プラズマ分離手段に関しては、給気口
２３のみでプラズマ炎１５の分離が可能な場合も
あり、そのプラズマ分離の為の給気の方向、すな
わちプラズマ炎１５の中心軸に対して直角方向
か、ある角度を持たせるかは、本発明の技術思想
に基づいて適当にこれを定める事が出来る。又、
プラズマ分離手段として、排気システムのみを用
いる事も出来、或いは、給気と排気とを併用する
ことも出来、これらの何れを選択するかは、その
使用目的や、プラズマ炎１５の大きさ、プラズマ
ガス量等に応じて適宜定めればよい。 The embodiment of this invention is shown in FIG.
It is not limited to the embodiment shown in FIG.
Many embodiments are possible based on the technical idea of this invention. Regarding the plasma separation means, there are cases where it is possible to separate the plasma flame 15 using only the air supply port 23, and the direction of the air supply for plasma separation, that is, the direction perpendicular to the central axis of the plasma flame 15, or Whether or not to provide an angle can be determined appropriately based on the technical concept of the present invention. or,
As a plasma separation means, it is possible to use only an exhaust system, or to use a combination of air supply and exhaust, and which of these is selected depends on the purpose of use, the size of the plasma flame 15, and the plasma It may be determined as appropriate depending on the amount of gas, etc.
〔発明の効果〕
本発明の溶射装置に於ては、放置すれば長大に
なる層流プラズマ炎を、処理対象物の直前でプラ
ズマのみを分離し、その直後に溶融した液滴状溶
射用材料を処理対象物に吹き付けることによつて
処理対象物に吹き付けるプラズマガスの速度も著
しく遅く、直接衝突するのはプラズマガスの極く
一部、及び溶融した液滴状溶射用材料だけである
ので、処理対象物に強力な力が加わる事がなく、
強度的に弱い処理対象物にも溶射を適用すること
が出来、かつ、良好な溶射被膜を形成する事が出
来る。[Effects of the Invention] In the thermal spraying apparatus of the present invention, only the plasma is separated from the laminar flow plasma flame, which becomes long if left undisturbed, just before the object to be treated, and the melted droplet-shaped thermal spraying material is immediately separated. The speed of the plasma gas that is sprayed onto the object to be treated is extremely slow, and only a small portion of the plasma gas and the molten droplet-shaped thermal spraying material collide directly with each other. No strong force is applied to the object to be processed,
Thermal spraying can be applied even to objects to be treated that are weak in strength, and a good thermal sprayed coating can be formed.
第１図は本発明の実施例を示すプラズマ溶射装
置の縦断面図、第２図は第１図の−線部の断
面図、第３図は本発明の一部分の他の実施例の縦
断面図、第４図は第３図の−線部の断面図で
ある。
１５……プラズマ炎、１６……溶射用材料供給
管、１７……溶射用材料、１８……プラズマ、１
９……液滴、２１……処理対象物、２２……プラ
ズマ分離装置、２３……気体給気口、２５……気
体排気口。
Fig. 1 is a longitudinal cross-sectional view of a plasma spraying apparatus showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a longitudinal cross-section of another embodiment of a part of the present invention. FIG. 4 is a cross-sectional view taken along the - line in FIG. 3. 15... Plasma flame, 16... Thermal spraying material supply pipe, 17... Thermal spraying material, 18... Plasma, 1
9...Droplet, 21...Processing object, 22...Plasma separation device, 23...Gas supply port, 25...Gas exhaust port.
Claims (1)
付近に、溶射用材料供給部をのぞかせ、該プラズ
マ炎における処理対象物の直前に、プラズマ分離
手段を設ける事を特徴とするプラズマ溶射装置。 ２ プラズマ分離手段が気体給気口であることを
特徴とする特許請求の範囲１記載のプラズマ溶射
装置。 ３ プラズマ分離手段が気体排気口であることを
特徴とする特許請求の範囲１記載のプラズマ溶射
装置。 ４ プラズマ分離手段が気体給気口と気体排気口
とを併用して成ることを特徴とする特許請求の範
囲１記載のプラズマ溶射装置。[Scope of Claims] 1. A plasma characterized in that a thermal spraying material supply section is exposed near the exit of the plasma flame of a laminar plasma generation torch, and a plasma separation means is provided immediately before the object to be treated in the plasma flame. Thermal spray equipment. 2. The plasma spraying apparatus according to claim 1, wherein the plasma separation means is a gas supply port. 3. The plasma spraying apparatus according to claim 1, wherein the plasma separation means is a gas exhaust port. 4. The plasma spraying apparatus according to claim 1, wherein the plasma separation means comprises a gas supply port and a gas exhaust port in combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12894885A JPS61287465A (en) | 1985-06-13 | 1985-06-13 | Plasma thermal spraying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12894885A JPS61287465A (en) | 1985-06-13 | 1985-06-13 | Plasma thermal spraying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61287465A JPS61287465A (en) | 1986-12-17 |
| JPH0585222B2 true JPH0585222B2 (en) | 1993-12-06 |
Family
ID=14997364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12894885A Granted JPS61287465A (en) | 1985-06-13 | 1985-06-13 | Plasma thermal spraying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61287465A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345368A (en) * | 2015-12-14 | 2016-02-24 | 河南恒远恒山工业有限公司 | End beam welding worktable of single-beam crane |
-
1985
- 1985-06-13 JP JP12894885A patent/JPS61287465A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345368A (en) * | 2015-12-14 | 2016-02-24 | 河南恒远恒山工业有限公司 | End beam welding worktable of single-beam crane |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61287465A (en) | 1986-12-17 |
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