JP2004225101A

JP2004225101A - Thermal spraying method and thermal spraying gun device

Info

Publication number: JP2004225101A
Application number: JP2003014177A
Authority: JP
Inventors: Hidenobu Matsuyama; 秀信松山; Akira Shimizu; 明清水
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2003-01-23
Filing date: 2003-01-23
Publication date: 2004-08-12
Anticipated expiration: 2023-01-23
Also published as: JP4039255B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal spraying method and thermal spraying gun device capable of affording a thermal sprayed film of a specified thickness on a surface to be thermal sprayed of a cylindrical surface of a treated object, such as a cylinder block. <P>SOLUTION: The thermal spraying method of forming the film by jetting the successively supplied droplets formed by melting a material for thermal spraying to a bore inside surface 1a from a tip member 53 of the thermal spraying gun device 3 in the state of rotating the tip member 53 comprises rotating the tip member 53 around a main unit section of the thermal spraying gun device 3 and rotating the main unit section with respect to a substrate, thereby applying thermal spraying while rotating the main unit section 70 together with the tip member 53. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばシリンダブロック等の円筒内面に溶射皮膜を形成する溶射方法及び溶射ガン装置に関する。
【０００２】
【従来の技術】
シリンダブロック等の円筒内面を有する被処理物の前記円筒内面に溶射皮膜を形成する溶射方法として、アセチレンとプロパンと酸素とで高温の燃焼炎を生成し、該燃焼炎中に溶射用材料である線材を一定速度で送り込み、この線材を溶融した溶滴を高速で前記円筒内面に吹き付けるものがある（例えば特許文献１参照）。
【０００３】
【特許文献１】
特開平７−６２５１９号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、前記特許文献１に記載された溶射ガン装置では、溶射ガン装置の先端部のみが回転するように構成されている。従って、溶射ガン装置の構成部品自体の寸法精度や構成部品の組付精度にバラツキが生じると、溶射ガン装置の先端部の回転に伴って所定の角度位置において機械的な負荷が掛かるおそれがある。また、線材を送給するための供給孔と線材との間に間隙があり、この間隙が大きくなると送給中に線材の位置が、径方向にばらついて移動する。このため、溶射皮膜の膜厚が円筒内面の周方向で不均一になるという問題がある。
【０００５】
そこで、本発明は、円筒内面における溶射皮膜の膜厚の均一性を向上させることを目的とする。
【０００６】
【課題を解決するための手段】
前記目的を達成するために、本発明は、順次供給される溶射用材料を溶融させた溶滴を、溶射ガン装置の先端部材を回転させた状態で該先端部材から円筒内面に噴射して皮膜を形成する溶射方法において、前記先端部材を溶射ガン装置の本体部に対して回転させる一方、この本体部を基体に対して回転させることによって、前記先端部材と本体部を共に回転させながら溶射を施すことを特徴とする。
【０００７】
【発明の効果】
本発明によれば、溶射ガン装置の先端部材のみならず本体部も回転しながら溶射処理を行うため、先端部材のみを回転させながら溶射を行う場合に比較して、被溶射面に対する皮膜厚さのバラツキを低減することができ、円筒内面である被溶射面が周方向に均等な厚さに溶射を行うことができる。
【０００８】
【発明の実施の形態】
以下に、本発明の実施の形態を図面に基づき説明する。
【０００９】
図１は、本発明の第１実施形態に用いられる溶射ガン装置の全体構成を示しており、図２は、図１の溶射ガン装置の先端部を拡大した断面図である。ここでの円筒内面は、自動車用エンジンにおけるアルミニウム合金製のシリンダブロック１のボア内面１ａであり、このシリンダボア内に、ガス溶線式の溶射ガン装置３を挿入し、その溶射口３ａから溶射用材料として溶融した鉄系金属材料の溶射粒子をボア内面１ａに溶射して溶射皮膜３２を形成する。
【００１０】
溶射ガン装置３は、溶線送給機５から溶射用材料として鉄系金属材料の溶線７の送給を受けるとともに、アセチレンまたはプロパンあるいはエチレンなどの燃料を貯蔵した燃料ガスボンベ９と酸素を貯蔵した酸素ボンベ１１とから、配管１３，１５を介して燃料ガスと酸素の供給をそれぞれ受ける。
【００１１】
前記溶線７は、溶射ガン装置３の中央部の上下に貫通して設けられた溶射用材料送給部としての溶線送給孔１７の上端から下方に向けて送給される。また、燃料および酸素は、図２に示すように、溶線送給孔１７の外側の円筒部１９に、上下方向に貫通して形成してあるガス案内流路２１に供給する。この供給した燃料および酸素の混合ガスは、ガス案内流路２１の下端開口部２１ａから流出し、点火されることによって燃焼炎２３が形成される。
【００１２】
前記円筒部１９の外周側には、アトマイズエア流路２５を設けてあり、該アトマイズエア流路２５の外周側には、いずれも円筒形状の隔壁２７と外壁２９との間に形成したアクセラレータエア流路３１が形成されている。
【００１３】
アトマイズエア流路２５を流れるアトマイズエアは、燃焼炎２３の熱を前方（図２中で下方）へ送って周辺部に対する冷却を行うとともに、溶融した溶線７を同前方へ送る。一方、アクセラレータエア流路３１を流れるアクセラレータエアは、前方へ送られ溶融した溶線７を、この送り方向と交差するように前記ボア内面１ａに向けて溶射粒子６５として吹きつけることによって、ボア内面１ａに溶射皮膜３２を形成する。
【００１４】
アトマイズエア流路２５には、図１に示すように、アトマイズエア供給源３３から、減圧弁３５を備えたエア供給管３７を通してアトマイズエアを供給するように構成されている。一方、アクセラレータエア流路３１には、アクセラレータエア供給源３９から、減圧弁４１およびマイクロミストフィルタ４３をそれぞれ備えたエア供給管４５を通してアクセラレータエアを供給するように構成されている。
【００１５】
アトマイズエア流路２５とアクセラレータエア流路３１との間に設けられた隔壁２７には、図２に示すように、図中で下部側の先端に回転筒部４９が取り付けられている。該回転筒部４９は、溶射ガン装置本体部を構成する外壁２９に対しベアリング４７を介して回転自在に構成されており、回転筒部４９の上部外周には、アクセラレータエア流路３１内に位置する回転翼５１を取り付けている。この回転翼５１に、アクセラレータエア流路３１を流れるアクセラレータエアが作用することによって、回転筒部４９、隔壁２７及び後述する先端部材５３が回転するように構成されている。
【００１６】
回転筒部４９の先端面（下端面）４９ａには、回転筒部４９と一体となって回転する先端部材５３を固定しており、前記回転筒部４９の先端部の内面（下端内面）４９ｂは傾斜した先細り形状となって、先端部材５３の傾斜面５３ａに連続するように対応して設けられている。先端部材５３の周縁の一部には、前述したアクセラレータエア流路３１にベアリング４７を介して連通する噴出流路５５を備えた突出部５７を設けてある。
【００１７】
噴出流路５５は、アクセラレータエア流路３１とほぼ同一直線状に連続する基部流路５５ａと、基部流路５５ａの下端からほぼ９０度屈曲してボア内面１ａに向けて開口する先端流路５５ｂとを備えている。この先端流路５５ｂの先端開口が、溶射ガン装置３の前記溶射口３ａとなる。
【００１８】
先端部材５３の突出部５７を除く周縁部は、板状部５９となってアクセラレータエア流路３１の先端開口を覆っている。
【００１９】
さらに、溶射ガン装置３の本体部は、詳細には図示しないが、外壁２９と該外壁２９を支持する基体を備えており、この外壁２９が駆動装置によって基体に対して回転可能に構成されている。ガン本体部の回転方向は、先端部材５３と同一方向及び反対方向のいずれも選択することが可能である。また、溶射ガン装置本体部の回転速度は１０〜２０ｍ／分であり、溶射ガン装置先端部材５３の回転速度は、本体部よりも速い１００〜３００ｍ／分となるように構成されている。
【００２０】
次に、図３の動作説明図を用いて作用を説明する。この第１実施形態においては、溶射ガン装置３の先端部材５３と本体部の双方を回転させながら、ボア内面１ａを往路移動することによって、ボア内面１ａに１パスのみ溶射を行うものである
まず、図３（ａ）に示すように、溶射粒子６５をボア内面１ａに吹き付けながら溶射ガン装置３を下降させる。図１，図２に示すように、燃料ガスボンベ９と酸素ボンベ１１から燃料および酸素をガス案内流路２１にそれぞれ供給し、ガス案内流路２１の下端開口部２１ａから流出する混合ガスに点火して燃焼炎２３を形成する。このとき、アトマイズエア流路２５に減圧弁３５によって減圧したアトマイズエアを供給したのち、アクセラレータエア流路３１に、減圧弁４１によって減圧しかつマイクロミストフィルタ４３によってエア中の水分や油分あるいは塵埃を濾過したアクセラレータエアを供給する。
【００２１】
アクセラレータエア流路３１に供給したアクセラレータエアが回転翼５１を通過すると、隔壁２７、回転筒部４９及び先端部材５３は、溶射ガン装置本体部を構成する外壁２９に対してベアリング４７を介して、１００〜３００ｍ／分の速度で回転する。
【００２２】
さらに、アクセラレータエアは、ベアリング４７を通過してベアリング４７を冷却し、噴出流路５５を流れた後、その先端の溶射口３ａからボア内面１ａに向けて噴出される。この溶射口３ａから噴出されるアクセラレータエアは、アトマイズエアによって前方へ送られた前記燃焼炎２３の熱を伴って、図２に示すように、溶線７を溶解して溶射粒子６５とし、該溶射粒子６５をボア内面１ａに吹き付ける。図示しない上下動用駆動装置を用いて溶射ガン装置３の全体をボア内を下方に向けて下降させる。
【００２３】
一方、外壁２９等の溶射ガン装置本体部を、前述したように、図示しない駆動装置によって前記回転筒部４９及び先端部材５３と同じ方向に回転させる。この回転速度は、先端部材５３よりも遅い１０〜２０ｍ／分である。
【００２４】
以上説明したように、図３（ａ）に示すように、溶射ガン装置３の本体部７０及び先端部材５３の双方を回転させた状態で、溶射ガン装置３をボア内の下方へ往路移動させる。この結果、ボア内面１ａのほぼ全面に亘って前述した溶射皮膜３２が形成される。
【００２５】
次いで、図３（ｂ）に示すように、ボア内面１ａの下端部まできたら溶滴噴射を停止し、溶射ガン装置３の上下動、先端部材５３と本体部７０の回転も停止させる。
【００２６】
そして、図３（ｃ）に示すように、溶射ガン装置３を回転も噴射もしない状態で上方に移動してボア内の上端部まで到達すると、溶射が終了する。
【００２７】
前述した第１実施形態によれば、膜厚偏りの傾向が溶射ガン装置３の回転方向（ボア内面の周方向）に分散されて偏りが減少するため、膜厚が均一な溶射皮膜が形成される。例えば、溶射ガン装置３の先端部材５３のみを回転させながら溶射を行った場合には溶射皮膜の最大値と最小値とで２００μｍあったところ、第１実施形態によれば、２０μｍと約１０分の１に大幅に低減した。
【００２８】
次いで、第２実施形態について説明するが、前記第１実施形態と同一内容については説明を省略する。
【００２９】
前記第１実施形態では、ボア内面１ａの上端から下端までの１パス目の往路においてのみ溶射を行ったが、第２実施形態では、図４（ａ）〜（ｃ）に示すように、ボア内面１ａの上端から下端までの往路である１パス目のみならず、下端から上端に戻る復路である２パス目においても溶射を行うものである。ただし、溶射ガン装置３の本体部７０は、溶射時には回転せずに、本体部７０の方向転換を目的として１パス目と２パス目との間に旋回する。
【００３０】
まず、前述した第１実施形態と同様に、図４（ａ）に示すように、アクセラレータエア流路３１に供給したアクセラレータエアを回転翼５１を通過させることによって溶射ガン装置３の先端部材５３を回転させたのち、溶射口３ａから噴き出す高温のアクセラレータエアによって溶滴状の溶射粒子６５の噴射を行う。こののち、溶射ガン装置３をその先端部材５３のみを回転させながら下降させて、ボア内面１ａに１パス目の溶射を施す。
【００３１】
次いで、図４（ｂ）に示すように、ボア内面１ａの下端に到達したときに、下降を停止させ、溶射ガン装置３の本体部７０を１パス目の本体部７０の周方向位置から１８０°旋回させる。この状態で、図４（ｃ）に示すように、２パス目として、溶射ガン装置３を上昇させながら先端部材５３を回転させることによって、復路の溶射を行う。そして、ボアの上端に到達したときに、溶射粒子６５の噴射を停止し、先端部材５３の回転も停止させる。さらに、溶射ガン装置本体部７０を１８０°旋回させて元の角度位置に戻して終了する。
【００３２】
前記第２実施形態によれば、膜厚の偏りが円筒状のボア内面１ａの周方向で互いに１８０°の位置に生じる場合、即ち、ボア内面１ａの中心軸を挟んで互いに対向する周面の膜厚が、一方が薄く他方が厚い場合に、効率的に膜厚の均一化を図ることができる。
【００３３】
次に、第３実施形態について説明する。
【００３４】
この第３実施形態では、図５（ａ）〜（ｃ）に示すように、ボア内面１ａに予熱を施したのちに、第１実施形態による溶射を施すことを特徴とするものである。
【００３５】
まず、図２に示すように、アクセラレータエア流路３１内にアクセラレータエアを供給すると、アクセラレータエアは噴出流路５５を流れたのち、溶射口３ａから噴き出す。この噴射口３ａから噴出するアクセラレータエアは、図５（ａ）に示すように、アトマイズエアによって前方に送られた前記燃焼炎の熱を伴って熱風６１となり、ボア内面１ａに吹き付けられる。
【００３６】
この状態で、図５（ａ）に示すように、溶射ガン装置３をシリンダボア内に先端部材５３を挿入した状態から図中で下方に往路移動させる。この移動時では、溶線７の供給はまだ行わず、溶射口３ａを備えた先端部材５３が回転しながら下方へ移動することで、溶射口３ａから噴出する熱風６１をボア内面１ａに当て、図５（ｂ）に示すように、ボア内面１ａの下端に至るまでボア内面１ａの予熱を行う。
【００３７】
こののちは、前記第１実施形態と同様に、図５（ｃ）に示すように、溶射ガン装置３の先端部材５３から溶滴を噴出させ、溶射ガン装置３の本体部材５３を回転させながら、ボア内を上方に移動させることによって、ボア内面１ａに溶射を施す。
【００３８】
この第３実施形態によれば、予熱を施して高温に保持されたボア内面に溶射を行うため、吹き付けられた溶滴の流れ性が向上し、溶射皮膜の厚さが周方向で均一に形成される。また、溶射皮膜のボア内面に対する密着性が向上する。
【００３９】
以上述べたように、本発明に係る溶射方法及び溶射ガン装置は、第１〜第３実施形態に例をとって説明したが、これらの各実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で各種の実施形態を採用することができる。
【図面の簡単な説明】
【図１】本発明の実施形態による溶射ガン装置の全体構成を示す概略図である。
【図２】図１の溶射ガン装置の先端を拡大した断面図である。
【図３】第１の実施形態による溶射方法の動作説明図で、（ａ）は被溶射面に対する溶射処理作業をしている状態を示し、（ｂ）は被溶射面の下端に溶射ガン装置が移動した状態を示し、（ｃ）は溶射作業を行うことなく、溶射ガン装置が上昇する状態を示す。
【図４】第２の実施形態による溶射方法の動作説明図で、（ａ）は被溶射面に対する１パス目の溶射処理作業をしている状態を示し、（ｂ）は被溶射面の下端に溶射ガン装置が移動した状態を示し、（ｃ）は被溶射面に対する２パス目の溶射処理作業をしている状態を示す。
【図５】第３の実施形態による溶射方法の動作説明図で、（ａ）は溶射作業を行うことなく、被溶射面に対して予熱処理を行っている状態を示し、（ｂ）は被溶射面の下端に溶射ガン装置が移動した状態を示し、（ｃ）は被溶射面に対する１パス目の溶射処理作業をしている状態を示す。
【符号の説明】
１ａボア内面（円筒内面）
３溶射ガン装置
７溶線（溶射用材料）
３１アクセラレータエア流路
５３先端部材
６５溶射粒子（溶滴）
７０本体部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal spraying method and a thermal spray gun apparatus for forming a thermal spray coating on an inner surface of a cylinder such as a cylinder block.
[0002]
[Prior art]
As a thermal spraying method for forming a thermal spray coating on the cylindrical inner surface of an object to be processed having a cylindrical inner surface such as a cylinder block, a high-temperature combustion flame is generated with acetylene, propane and oxygen, and a thermal spray material is used in the combustion flame. There is one that feeds a wire at a constant speed and sprays a molten droplet of the wire on the inner surface of the cylinder at a high speed (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-62519
[Problems to be solved by the invention]
However, the thermal spray gun apparatus described in Patent Document 1 is configured such that only the tip of the thermal spray gun apparatus rotates. Therefore, if variations occur in the dimensional accuracy of the component parts of the spray gun apparatus and the assembly accuracy of the component parts, there is a risk that a mechanical load is applied at a predetermined angular position as the tip of the spray gun apparatus rotates. . Further, there is a gap between the supply hole for feeding the wire and the wire, and when this gap becomes large, the position of the wire moves in a radial direction during feeding. For this reason, there exists a problem that the film thickness of a sprayed coating becomes non-uniform | heterogenous in the circumferential direction of a cylindrical inner surface.
[0005]
Therefore, an object of the present invention is to improve the uniformity of the film thickness of the thermal spray coating on the inner surface of the cylinder.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is directed to spraying droplets obtained by melting sequentially supplied spraying materials from the tip member onto the inner surface of the cylinder while rotating the tip member of the spray gun device. In this thermal spraying method, the tip member is rotated with respect to the main body portion of the thermal spray gun apparatus, while the main body portion is rotated with respect to the base, thereby spraying the tip member and the main body portion while rotating both. It is characterized by giving.
[0007]
【The invention's effect】
According to the present invention, since the thermal spraying process is performed while rotating not only the tip member of the spray gun apparatus but also the main body, the coating thickness on the surface to be sprayed is compared with the case where the thermal spraying is performed while rotating only the tip member. Thus, the sprayed surface, which is the inner surface of the cylinder, can be sprayed to a uniform thickness in the circumferential direction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
FIG. 1 shows the overall configuration of the thermal spray gun apparatus used in the first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the tip of the thermal spray gun apparatus of FIG. The cylindrical inner surface here is a bore inner surface 1a of a cylinder block 1 made of an aluminum alloy in an automobile engine, and a gas spray type spray gun device 3 is inserted into the cylinder bore, and a material for thermal spraying is applied from the spray port 3a. The thermal spray coating 32 is formed by spraying the sprayed particles of the iron-based metal material molten on the bore inner surface 1a.
[0010]
The thermal spray gun apparatus 3 is supplied with a molten metal 7 of a ferrous metal material as a thermal spray material from a thermal feeder 5, and a fuel gas cylinder 9 storing a fuel such as acetylene, propane or ethylene, and an oxygen storing oxygen. Fuel gas and oxygen are respectively supplied from the cylinder 11 through the pipes 13 and 15.
[0011]
The hot wire 7 is fed downward from the upper end of the hot wire feed hole 17 serving as a thermal spray material feeding portion provided so as to penetrate the central portion of the thermal spray gun device 3. Further, as shown in FIG. 2, the fuel and oxygen are supplied to a gas guide channel 21 formed in a cylindrical portion 19 outside the melt feed hole 17 so as to penetrate in the vertical direction. The supplied mixed gas of fuel and oxygen flows out from the lower end opening 21a of the gas guide channel 21 and is ignited to form a combustion flame 23.
[0012]
An atomizing air flow path 25 is provided on the outer peripheral side of the cylindrical portion 19, and an accelerator air formed between the cylindrical partition wall 27 and the outer wall 29 is provided on the outer peripheral side of the atomizing air flow path 25. A flow path 31 is formed.
[0013]
The atomizing air flowing through the atomizing air flow path 25 sends the heat of the combustion flame 23 forward (downward in FIG. 2) to cool the peripheral portion, and sends the molten wire 7 forward. On the other hand, the accelerator air flowing through the accelerator air flow path 31 blows the molten wire 7 sent forward and melted as the sprayed particles 65 toward the bore inner surface 1a so as to intersect the feeding direction, whereby the bore inner surface 1a. A sprayed coating 32 is formed on the substrate.
[0014]
As shown in FIG. 1, the atomized air flow path 25 is configured to supply atomized air from an atomized air supply source 33 through an air supply pipe 37 provided with a pressure reducing valve 35. On the other hand, the accelerator air flow path 31 is configured to supply accelerator air from an accelerator air supply source 39 through an air supply pipe 45 provided with a pressure reducing valve 41 and a micro mist filter 43, respectively.
[0015]
As shown in FIG. 2, a rotating cylinder portion 49 is attached to the lower end of the partition wall 27 provided between the atomizing air flow path 25 and the accelerator air flow path 31 as shown in FIG. The rotary cylinder portion 49 is configured to be rotatable with respect to the outer wall 29 constituting the spray gun apparatus main body via a bearing 47, and is positioned in the accelerator air flow path 31 at the upper outer periphery of the rotary cylinder portion 49. A rotating blade 51 is attached. When the accelerator air flowing through the accelerator air flow path 31 acts on the rotary blade 51, the rotary cylinder portion 49, the partition wall 27, and a tip member 53 described later are configured to rotate.
[0016]
A distal end member 53 that rotates integrally with the rotating cylinder portion 49 is fixed to a distal end surface (lower end surface) 49a of the rotating cylinder portion 49, and an inner surface (lower end inner surface) 49b of the distal end portion of the rotating cylinder portion 49 is fixed. Is inclined and tapered, and is provided so as to be continuous with the inclined surface 53 a of the tip member 53. A part of the peripheral edge of the tip member 53 is provided with a protruding portion 57 provided with an ejection passage 55 communicating with the accelerator air passage 31 described above via a bearing 47.
[0017]
The ejection channel 55 includes a base channel 55a that is substantially in the same straight line as the accelerator air channel 31, and a tip channel 55b that bends approximately 90 degrees from the lower end of the base channel 55a and opens toward the bore inner surface 1a. And. The tip opening of the tip channel 55 b becomes the spraying port 3 a of the spray gun device 3.
[0018]
The peripheral edge portion of the tip member 53 excluding the protruding portion 57 serves as a plate-like portion 59 and covers the tip opening of the accelerator air flow path 31.
[0019]
Further, although not shown in detail, the main body portion of the thermal spray gun apparatus 3 includes an outer wall 29 and a base body that supports the outer wall 29. The outer wall 29 is configured to be rotatable with respect to the base body by a driving device. Yes. The direction of rotation of the gun body can be selected in the same direction as the tip member 53 or in the opposite direction. Moreover, the rotational speed of the spray gun apparatus main body is 10 to 20 m / min, and the rotational speed of the spray gun apparatus tip member 53 is configured to be 100 to 300 m / min, which is faster than the main body.
[0020]
Next, the operation will be described with reference to the operation explanatory diagram of FIG. In the first embodiment, only one pass is sprayed on the bore inner surface 1a by moving the bore inner surface 1a forward while rotating both the tip member 53 and the main body of the spray gun device 3. As shown in FIG. 3A, the spray gun device 3 is lowered while spraying the spray particles 65 on the bore inner surface 1a. As shown in FIGS. 1 and 2, fuel and oxygen are respectively supplied from a fuel gas cylinder 9 and an oxygen cylinder 11 to a gas guide channel 21, and a mixed gas flowing out from a lower end opening 21 a of the gas guide channel 21 is ignited. Thus, the combustion flame 23 is formed. At this time, atomized air decompressed by the decompression valve 35 is supplied to the atomizing air flow path 25, and then the accelerator air flow path 31 is decompressed by the decompression valve 41 and moisture, oil or dust in the air is removed by the micro mist filter 43. Supply filtered accelerator air.
[0021]
When the accelerator air supplied to the accelerator air flow path 31 passes through the rotary blade 51, the partition wall 27, the rotary cylinder portion 49, and the tip member 53 are connected to the outer wall 29 constituting the thermal spray gun apparatus main body portion via a bearing 47. It rotates at a speed of 100 to 300 m / min.
[0022]
Further, the accelerator air passes through the bearing 47, cools the bearing 47, flows through the ejection channel 55, and is then ejected from the spraying port 3a at the tip thereof toward the bore inner surface 1a. The accelerator air ejected from the thermal spraying port 3a is accompanied by the heat of the combustion flame 23 sent forward by the atomizing air, as shown in FIG. Particles 65 are sprayed onto the bore inner surface 1a. The spray gun device 3 as a whole is lowered downward in the bore using a vertical movement drive device (not shown).
[0023]
On the other hand, as described above, the spray gun apparatus main body such as the outer wall 29 is rotated in the same direction as the rotary cylinder 49 and the tip member 53 by a driving device (not shown). This rotational speed is 10 to 20 m / min, which is slower than the tip member 53.
[0024]
As described above, as shown in FIG. 3A, the spray gun apparatus 3 is moved forward in the bore while both the main body 70 and the tip member 53 of the spray gun apparatus 3 are rotated. . As a result, the above-mentioned sprayed coating 32 is formed over substantially the entire inner surface 1a of the bore.
[0025]
Next, as shown in FIG. 3 (b), spraying is stopped when the lower end of the bore inner surface 1a is reached, and the vertical movement of the spray gun device 3 and the rotation of the tip member 53 and the main body 70 are also stopped.
[0026]
Then, as shown in FIG. 3C, when the thermal spray gun apparatus 3 is moved upward without reaching the upper end portion in the bore without being rotated or sprayed, the thermal spraying is finished.
[0027]
According to the first embodiment described above, the tendency of the film thickness unevenness is dispersed in the rotation direction of the thermal spray gun apparatus 3 (the circumferential direction of the bore inner surface) and the unevenness is reduced, so that a sprayed coating with a uniform film thickness is formed. The For example, when spraying is performed while only the tip member 53 of the spray gun device 3 is rotated, the maximum value and the minimum value of the spray coating are 200 μm, but according to the first embodiment, 20 μm is about 10 minutes. It was greatly reduced to 1.
[0028]
Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
[0029]
In the first embodiment, the thermal spraying is performed only in the forward path of the first pass from the upper end to the lower end of the bore inner surface 1a. However, in the second embodiment, as shown in FIGS. Thermal spraying is performed not only in the first pass, which is the forward path from the upper end to the lower end of the inner surface 1a, but also in the second pass, which is the return path from the lower end to the upper end. However, the main body 70 of the thermal spray gun apparatus 3 does not rotate at the time of thermal spraying, but turns between the first pass and the second pass for the purpose of changing the direction of the main body 70.
[0030]
First, as in the first embodiment described above, as shown in FIG. 4A, the accelerator air supplied to the accelerator air flow path 31 is allowed to pass through the rotor blades 51 so that the tip member 53 of the spray gun apparatus 3 is moved. After the rotation, the droplet-shaped sprayed particles 65 are sprayed by the high-temperature accelerator air ejected from the spray port 3a. After that, the thermal spray gun apparatus 3 is lowered while rotating only the tip member 53, and the first-pass thermal spraying is performed on the bore inner surface 1a.
[0031]
Next, as shown in FIG. 4B, when reaching the lower end of the bore inner surface 1a, the lowering is stopped, and the main body portion 70 of the thermal spray gun apparatus 3 is moved 180 degrees from the circumferential position of the main body portion 70 of the first pass. ° Turn. In this state, as shown in FIG. 4C, in the second pass, the tip member 53 is rotated while the thermal spray gun apparatus 3 is raised to perform thermal spraying on the return path. When reaching the upper end of the bore, the spraying of the sprayed particles 65 is stopped, and the rotation of the tip member 53 is also stopped. Further, the spray gun apparatus main body 70 is turned by 180 ° to return to the original angular position, and the process ends.
[0032]
According to the second embodiment, when the thickness unevenness occurs at 180 ° positions in the circumferential direction of the cylindrical bore inner surface 1a, that is, the circumferential surfaces facing each other across the central axis of the bore inner surface 1a. When the film thickness is thin and the other is thick, the film thickness can be made uniform efficiently.
[0033]
Next, a third embodiment will be described.
[0034]
As shown in FIGS. 5A to 5C, the third embodiment is characterized by performing thermal spraying according to the first embodiment after preheating the bore inner surface 1a.
[0035]
First, as shown in FIG. 2, when accelerator air is supplied into the accelerator air flow path 31, the accelerator air flows through the ejection flow path 55 and then blows out from the spray port 3 a. As shown in FIG. 5A, the accelerator air ejected from the ejection port 3a becomes hot air 61 with the heat of the combustion flame sent forward by the atomized air, and is blown to the bore inner surface 1a.
[0036]
In this state, as shown in FIG. 5A, the thermal spray gun apparatus 3 is moved downward in the drawing from the state in which the tip member 53 is inserted into the cylinder bore. During this movement, the molten wire 7 is not supplied yet, and the tip member 53 provided with the spraying port 3a moves downward while rotating, so that the hot air 61 ejected from the spraying port 3a is applied to the bore inner surface 1a. As shown in FIG. 5B, the bore inner surface 1a is preheated up to the lower end of the bore inner surface 1a.
[0037]
After that, as in the first embodiment, as shown in FIG. 5 (c), a droplet is ejected from the tip member 53 of the spray gun device 3, and the main body member 53 of the spray gun device 3 is rotated. The inner surface 1a of the bore is sprayed by moving the inside of the bore upward.
[0038]
According to the third embodiment, since spraying is performed on the inner surface of the bore that has been preheated and maintained at a high temperature, the flowability of the sprayed droplets is improved, and the thickness of the sprayed coating is uniformly formed in the circumferential direction. Is done. Moreover, the adhesiveness with respect to the bore | bore inner surface of a thermal spray coating improves.
[0039]
As described above, the thermal spraying method and the thermal spray gun apparatus according to the present invention have been described by taking the first to third embodiments as examples. However, the present invention is not limited to these embodiments. Various embodiments can be adopted without departing from the gist.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an overall configuration of a thermal spray gun apparatus according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of the tip of the thermal spray gun apparatus of FIG. 1. FIG.
FIGS. 3A and 3B are operation explanatory views of the thermal spraying method according to the first embodiment, in which FIG. 3A shows a state in which a thermal spraying operation is performed on the surface to be sprayed, and FIG. (C) shows a state in which the spray gun device is raised without performing the spraying operation.
FIGS. 4A and 4B are operation explanatory views of a thermal spraying method according to the second embodiment, in which FIG. 4A shows a state in which a first-pass thermal spraying operation is performed on the surface to be sprayed, and FIG. 4B shows a lower end of the surface to be sprayed; Fig. 8 shows a state where the spray gun apparatus has moved, and Fig. 8C shows a state where the second spraying treatment work is being performed on the surface to be sprayed.
FIGS. 5A and 5B are operation explanatory views of a thermal spraying method according to a third embodiment, in which FIG. 5A shows a state in which pre-heat treatment is performed on a surface to be sprayed without performing a thermal spraying operation, and FIG. The state which the spray gun apparatus moved to the lower end of a spraying surface is shown, (c) shows the state which is performing the spraying process operation | work of the 1st pass with respect to a to-be-sprayed surface.
[Explanation of symbols]
1a Bore inner surface (cylindrical inner surface)
3 Thermal spray gun equipment 7 Welding wire (material for thermal spraying)
31 Accelerator air flow path 53 Tip member 65 Spray particles (spray)
70 Body

Claims

In the spraying method of forming a coating by injecting the droplets obtained by sequentially melting the spraying material supplied sequentially and spraying the tip member of the spray gun device from the tip member to the inner surface of the cylinder,
While the tip member is rotated with respect to the main body portion of the thermal spray gun apparatus, the main body portion is rotated with respect to the base, thereby performing spraying while simultaneously rotating the tip member and the main body portion. Thermal spraying method.

The thermal spraying method according to claim 1, wherein a main body of the thermal spray gun apparatus is rotated at a speed slower than that of the tip member.

In the spraying method of forming a coating by spraying droplets obtained by melting sequentially supplied spraying materials from the tip member onto the inner surface of the cylinder while rotating the tip member of the spray gun apparatus, After the first-pass spraying is finished, the main body of the spray gun device is turned to the circumferential position on the inner surface of the cylinder where the film thickness is reduced by the first-pass spraying to perform the second-pass and subsequent spraying. The thermal spraying method according to claim 1 or 2, characterized by the above.

The thermal spraying method according to claim 3, wherein the turning angle of the main body of the thermal spray gun apparatus is approximately 180 °.

In the spray gun apparatus that forms a coating by spraying the droplets obtained by sequentially melting the spraying material supplied to the inner surface of the cylinder while rotating the tip member of the spray gun apparatus.
While supporting the tip member rotatably with respect to the main body portion of the spray gun apparatus, the tip member is rotated with respect to the main body portion by rotatably attaching the main body portion to the base, and the main body portion is A thermal spray gun apparatus configured to rotate with respect to a substrate.

The thermal spray gun apparatus according to claim 5, wherein the tip member is configured to be rotated by air supplied to an accelerator air flow path in the thermal spray gun apparatus main body.