JP4984780B2 - Masking device for thermal spray coating - Google Patents

Masking device for thermal spray coating Download PDF

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JP4984780B2
JP4984780B2 JP2006252251A JP2006252251A JP4984780B2 JP 4984780 B2 JP4984780 B2 JP 4984780B2 JP 2006252251 A JP2006252251 A JP 2006252251A JP 2006252251 A JP2006252251 A JP 2006252251A JP 4984780 B2 JP4984780 B2 JP 4984780B2
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coating
thermal spray
spray coating
masking
sprayed
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JP2008075096A (en
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英爾 塩谷
勇治 宮野
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/20—Masking elements, i.e. elements defining uncoated areas on an object to be coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles

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  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Coating By Spraying Or Casting (AREA)

Description

本発明は、シリンダボアの内壁に溶射皮膜を形成する際に使用する溶射皮膜形成用マスキング装置に関する。   The present invention relates to a thermal spray coating forming masking device used when forming a thermal spray coating on an inner wall of a cylinder bore.

エンジンのシリンダブロックに形成されたシリンダボアの内壁に溶融した溶滴を吹き付けて溶射皮膜を形成する際、溶射皮膜の膜厚を均一にするために、シリンダボアの上端側は上端位置を超えた位置まで溶滴を吹き付ける必要がある（例えば、特許文献１など参照）。   When spraying molten droplets on the inner wall of the cylinder bore formed on the cylinder block of the engine to form a thermal spray coating, the upper end of the cylinder bore should reach a position beyond the upper end position in order to make the thermal spray coating uniform. It is necessary to spray droplets (see, for example, Patent Document 1).

その際に、シリンダブロックの上端面、隣接するシリンダボアへの不要な溶滴の付着防止、および上端側の溶射フレーム角度安定のため、シリンダボアの内径と同等以下の円筒形状をしたマスキング部材を使用することが行われている。
特開平７−６２５１８号公報 At that time, in order to prevent unnecessary droplets from adhering to the upper end surface of the cylinder block and the adjacent cylinder bore and to stabilize the spray frame angle on the upper end side, a masking member having a cylindrical shape equal to or smaller than the inner diameter of the cylinder bore is used. Things have been done.
JP-A-7-62518

このマスキング部材の材料或いは表面処理として、溶射皮膜が付着し易い材料或いは表面処理とした場合には、シリンダボアを溶射する毎にマスキング内面へ溶滴が付着する。また、マスキング内面への溶滴の付着は、マスキング部材の内径を小さくすることから、（１）溶射フレームの角度不良および排気流速低下による溶射皮膜の品質劣化、（２）エンジンブロックとマスキング部材の縁切り部に溶射皮膜が堆積してこれらの間で溶射皮膜がつながり、マスキング部材を外す際にシリンダボア上端の皮膜が剥がれる、（３）溶射ガンとの接触などの問題が発生するため溶射適当回数ごとにマスキング内面の皮膜を機械的に除去する、等の問題が生じる。   When the material or surface treatment of the masking member is a material or surface treatment to which a sprayed coating easily adheres, droplets adhere to the masking inner surface every time the cylinder bore is sprayed. Also, the adhesion of droplets to the inner surface of the masking reduces the inner diameter of the masking member. Therefore, (1) Degradation of spray coating quality due to poor angle of spray frame and reduction of exhaust flow velocity, (2) Engine block and masking member A thermal spray coating is deposited on the edge cutting part, and the thermal spray coating is connected between them. When the masking member is removed, the coating on the upper end of the cylinder bore is peeled off. (3) Problems such as contact with the thermal spray gun occur. In other words, problems such as mechanical removal of the coating on the masking inner surface arise.

一方、マスキング部材の材料或いは表面処理として、溶射皮膜が付着し難い材料或いは表面処理とした場合には、溶射中にマスキング内面に付着した溶射皮膜が脱落し、その脱落した溶射皮膜が、シリンダボア内壁に形成される皮膜中に混入して当該溶射皮膜の品質を劣化させる。   On the other hand, if the material or surface treatment for the masking member is a material or surface treatment to which the thermal spray coating is difficult to adhere, the thermal spray coating adhered to the masking inner surface will fall off during the thermal spraying, and the thermal spray coating that has fallen will become the cylinder bore inner wall. The quality of the sprayed coating is deteriorated by being mixed in the coating formed on the surface.

そこで、本発明は、マスキング部材の内面に付着する溶滴が固まって形成される溶射皮膜が、シリンダボア内壁に形成される溶射皮膜へ混入しないようにして皮膜品質の向上を実現する溶射皮膜形成用マスキング装置を提供することを目的とする。   Therefore, the present invention is for forming a sprayed coating that realizes an improvement in coating quality by preventing the sprayed coating formed by solidifying the droplets adhering to the inner surface of the masking member from entering the sprayed coating formed on the inner wall of the cylinder bore. An object is to provide a masking apparatus.

本発明は、シリンダブロックに形成されたシリンダボアの内壁に、溶融した溶滴を吹き付けて溶射皮膜を形成する際に、溶射皮膜の膜厚を均一にするためのマスキング部材を、前記シリンダブロックの上端に配置した溶射皮膜形成用マスキング装置であって、前記マスキング部材の前記シリンダボアと連通する円形孔部の内面に、該マスキング部材の内面に吹き付けた溶滴が付着して形成される溶射皮膜の脱落を防止する皮膜脱落防止手段を設け、前記円形孔部は、前記シリンダブロックの上端に配置される下端側から上端側に向かって次第にその直径を大とすることを特徴とする。 The present invention provides a masking member for making the film thickness of a sprayed coating uniform when spraying molten droplets on the inner wall of a cylinder bore formed in the cylinder block to form an upper end of the cylinder block. The spraying coating forming masking device disposed on the inner surface of the circular hole portion communicating with the cylinder bore of the masking member, and the sprayed coating formed by adhering droplets sprayed on the inner surface of the masking member A film drop prevention means is provided to prevent the circular hole portion, and the diameter of the circular hole portion gradually increases from the lower end side disposed at the upper end of the cylinder block toward the upper end side .

本発明の溶射皮膜形成用マスキング装置によれば、マスキング部材の内面に付着して固まった溶射皮膜は、その内面に形成された皮膜脱落防止手段にて保持されることから、シリンダボアの内壁へと落下するのが防止される。したがって、シリンダボアの内壁に形成された溶射皮膜への前記マスキング部材内面の溶射皮膜が混入するのが防止され、皮膜品質を高めることができる。また、本発明によれば、マスキング部材に形成した円形孔部を下端面から上端面に向かって次第にその直径を大としたので、この円形孔部の内面に付着した皮膜が溶射中にシリンダボア内へ脱落することの防止効果をさらに高めることができると共に、溶射終了後にマスキング部材を上下逆さまに反転させてその内面に付着した皮膜を除去することができる。 According to the masking apparatus for forming a thermal spray coating of the present invention, the thermal spray coating adhered and hardened to the inner surface of the masking member is held by the coating drop prevention means formed on the inner surface, so that the inner wall of the cylinder bore is It is prevented from falling. Therefore, it is possible to prevent the sprayed coating on the inner surface of the masking member from entering the sprayed coating formed on the inner wall of the cylinder bore, and to improve the coating quality. Further, according to the present invention, since the diameter of the circular hole portion formed in the masking member is gradually increased from the lower end surface toward the upper end surface, the coating adhering to the inner surface of the circular hole portion is in the cylinder bore during spraying. In addition, the masking member can be turned upside down after the thermal spraying to remove the film attached to the inner surface .

以下、本発明を適用した具体的な実施の形態について図面を参照しながら詳細に説明する。   Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

「第１の実施の形態」
図１は第１の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射する前の状態を示す断面図、図２は第１の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射したときの状態を示す断面図、図３は第１の実施の形態を示し、溶射皮膜形成用マスキング装置の要部拡大断面図、図４は第１の実施の形態を示し、溶射皮膜形成用マスキング装置の内面に形成した皮膜脱落防止手段の要部拡大斜視図である。 “First Embodiment”
FIG. 1 shows a first embodiment, a sectional view showing a state before thermal spray coating masking device is disposed on the cylinder block upper end surface, and FIG. 2 shows the first embodiment. FIG. 3 is a cross-sectional view showing a state in which a mask forming apparatus for film formation is disposed on the upper end surface of the cylinder block and sprayed, FIG. 4 shows the first embodiment, and is an enlarged perspective view of a main part of a film drop-off preventing means formed on the inner surface of the thermal spray coating forming masking device.

シリンダブロック１は、図１に示すように、ピストンシリンダを収容配置させるシリンダボア２と、ピストンシリンダを上下運動させるためのクランクシャフトを回転収容するクランク室３とを備えている。本実施の形態では、図２に示すように、溶射ガン４を回転させながらガン先端部から溶融した溶滴をシリンダボア２の内壁（シリンダボア内壁２ａ）に吹き付けて溶射皮膜５を形成する際に、シリンダボア長手方向における膜厚を均一なものとするため、シリンダブロック上端にマスキング部材（溶射皮膜形成用マスキング装置）６を配置する。   As shown in FIG. 1, the cylinder block 1 includes a cylinder bore 2 in which a piston cylinder is accommodated and disposed, and a crank chamber 3 in which a crankshaft for moving the piston cylinder up and down is rotationally accommodated. In the present embodiment, as shown in FIG. 2, when the spray coating 5 is formed by spraying the molten droplet melted from the gun tip while rotating the spray gun 4 to the inner wall of the cylinder bore 2 (cylinder bore inner wall 2a), In order to make the film thickness uniform in the longitudinal direction of the cylinder bore, a masking member (masking device for forming a sprayed coating) 6 is disposed on the upper end of the cylinder block.

マスキング部材６は、シリンダブロック１の上端面１ａにその下端面６ａを隙間無く密着させて配置される。かかるマスキング部材６の前記シリンダボア２と連通する円形孔部７の内面には、シリンダボア内壁２ａに吹き付けた溶滴が付着して形成される溶射皮膜５の脱落を防止する皮膜脱落防止手段８が形成されている。   The masking member 6 is disposed with the lower end surface 6a thereof being in close contact with the upper end surface 1a of the cylinder block 1 without a gap. On the inner surface of the circular hole portion 7 communicating with the cylinder bore 2 of the masking member 6, film drop prevention means 8 is formed for preventing the sprayed film 5 formed by adhering the droplets sprayed on the cylinder bore inner wall 2 a. Has been.

皮膜脱落防止手段８としては、例えば図３及び図４に拡大して示すように、シリンダブロック１の上端に配置される下端側（下端面６ａ）から上端側（上端面６ｂ）へ向かって階段形状とされた凹部９Ａと凸部９Ｂからなる凹凸部９とされている。図４（Ａ）では、各凸部９Ｂ間の距離を設けて（凸部９Ｂ間を少し離して）形成した階段形状としており、また、凸部９Ｂの先端角度θを９０度未満としている。さらに、溶射皮膜５の脱落を防止するために、上側の凸部９Ｂの頂部と下側の凸部９Ｂの谷部を交差させない（同図中二点鎖線で示す）ようにしている。上側の凸部９Ｂの頂部と下側の凸部９Ｂの谷部を交差させないようにすることで、溶射後にシリンダブロック１を逆さにした際に、マスキング部材６に付着した皮膜を除去し易くできる。   For example, as shown in FIG. 3 and FIG. 4, the film drop prevention means 8 is a staircase from the lower end side (lower end surface 6a) disposed at the upper end of the cylinder block 1 to the upper end side (upper end surface 6b). The concave-convex portion 9 is formed of a concave portion 9A and a convex portion 9B. In FIG. 4A, a staircase shape is formed by providing a distance between the convex portions 9B (a little apart between the convex portions 9B), and the tip angle θ of the convex portion 9B is less than 90 degrees. Furthermore, in order to prevent the sprayed coating 5 from falling off, the top of the upper projection 9B and the valley of the lower projection 9B are not crossed (shown by a two-dot chain line in the figure). By preventing the top portion of the upper convex portion 9B and the valley portion of the lower convex portion 9B from crossing each other, the film attached to the masking member 6 can be easily removed when the cylinder block 1 is inverted after spraying. .

図４（Ｂ）では、凸部９Ｂ間の距離を狭めて通常の形の階段形状としており、その凸部９Ｂの先端角度θを９０度としている。また、この例の場合も同様、溶射皮膜５の脱落を防止するために、上側の凸部９Ｂの頂部と下側の凸部９Ｂの谷部を交差させずに一致させている。   In FIG. 4B, the distance between the convex portions 9B is narrowed to form a normal staircase shape, and the tip angle θ of the convex portion 9B is 90 degrees. In the case of this example as well, in order to prevent the sprayed coating 5 from falling off, the tops of the upper projections 9B and the valleys of the lower projections 9B are made to match without intersecting.

そして、本実施の形態では、前記円形孔部７は、シリンダブロック１の上端に配置される下端側から上端側に向かって次第にその直径を大として形成されている。すなわち、内面に凹部９Ａと凸部９Ｂとからなる凹凸部９を階段形状とした皮膜脱落防止手段８を形成した円形孔部７を、シリンダブロック上端に載置する下端面６ａから上端面６ｂに向かって内径寸法を徐々に大きくするいわゆるすり鉢形状の円形孔部７としている。円形孔部７の下端面６ａにおける内径Ａに対して上端面６ｂの内径Ｂを、Ａ＜Ｂなる関係としている。   In the present embodiment, the circular hole portion 7 is formed such that its diameter gradually increases from the lower end side disposed at the upper end of the cylinder block 1 toward the upper end side. That is, the circular hole portion 7 in which the film drop prevention means 8 having the concave and convex portion 9 including the concave portion 9A and the convex portion 9B on the inner surface is formed in a step shape is formed from the lower end surface 6a placed on the upper end of the cylinder block to the upper end surface 6b. A so-called mortar-shaped circular hole 7 whose inner diameter is gradually increased is formed. The inner diameter B of the upper end surface 6b is in a relationship of A <B with respect to the inner diameter A of the lower end surface 6a of the circular hole portion 7a.

また、本実施の形態では、円形孔部７の内面には、溶射皮膜５が付着しにくい表面処理を行うか、或いは、溶射皮膜５が付着しにくい材質で構成するようにする。かかる表面処理としては、金属であれば、基本的に溶射材（今回の場合はSteel＝Fe系）とイオン化傾向が遠いものがよく、実際にはＣｕだとイオン化傾向が遠くかつ熱伝導も速いので溶射皮膜が形成され難く、非金属であれば、セラミックス（Ａｌ2Ｏ3、ＳｉＯ2、ＢＮ等）および樹脂（PTFE）が挙げられる。したがって、溶射皮膜５が付着しにくい表面処理としては、Ｃｕめっき、セラミック溶射、樹脂コーティング（焼付け）が有効である。また、溶射皮膜５が付着しにく材質としては、表面処理同様、銅やセラミックなどが挙げられる。 Further, in the present embodiment, the inner surface of the circular hole portion 7 is subjected to a surface treatment in which the thermal spray coating 5 is difficult to adhere, or is made of a material in which the thermal spray coating 5 is difficult to adhere. As such a surface treatment, in the case of metal, basically, a thermal spray material (Steel = Fe system in this case) and an ionization tendency are far away. In fact, Cu is far away from ionization and heat conduction is fast. Therefore, it is difficult to form a sprayed coating, and ceramics (Al 2 O 3 , SiO 2 , BN, etc.) and resins (PTFE) can be used as long as they are non-metallic. Accordingly, Cu plating, ceramic spraying, and resin coating (baking) are effective as the surface treatment to which the sprayed coating 5 is difficult to adhere. In addition, examples of the material to which the sprayed coating 5 is difficult to adhere include copper and ceramic as well as the surface treatment.

このように、本実施の形態の溶射皮膜形成用マスキング装置６によれば、マスキング部材６の円形孔部７の内面に、凹凸部９から構成される皮膜脱落防止手段８を設けたので、溶射中に付着または剥離した溶射皮膜５がこれら凹凸部９の突起に支えられることで、シリンダボア内壁２ａに成膜される溶射皮膜５に前記皮膜が混入するのを防止することができる。したがって、シリンダボア内壁２ａに形成された溶射皮膜５の品質を高めることができる。   As described above, according to the masking device 6 for forming a sprayed coating according to the present embodiment, the coating drop-off preventing means 8 composed of the uneven portions 9 is provided on the inner surface of the circular hole portion 7 of the masking member 6. The sprayed coating 5 adhered or peeled inside is supported by the projections of the concavo-convex portions 9, so that the coating can be prevented from being mixed into the sprayed coating 5 formed on the cylinder bore inner wall 2a. Therefore, the quality of the thermal spray coating 5 formed on the cylinder bore inner wall 2a can be improved.

特に、凹部９Ａと凸部９Ｂで円形孔部７の内面を凹凸とすること、および、その凹凸部９を下端面６ａから上端面６ｂへ向かって階段形状とすることで、このマスキング部材６の内面に付着した皮膜が凹凸部９に引っ掛かって脱落するのを防止する効果がより一層高まる。   In particular, the concave portion 9A and the convex portion 9B make the inner surface of the circular hole portion 7 uneven, and the uneven portion 9 has a stepped shape from the lower end surface 6a toward the upper end surface 6b. The effect of preventing the film adhering to the inner surface from being caught by the concavo-convex portion 9 and falling off is further enhanced.

また、本実施の形態では、マスキング部材６に形成した円形孔部７を下端面６ａから上端面６ｂに向かって次第にその直径を大としたので、この円形孔部７の内面に付着した皮膜が溶射中にシリンダボア２内へ脱落することの防止効果をさらに高めることができると共に、溶射終了後にマスキング部材６を上下逆さまに反転させてその内面に付着した皮膜を除去することができる。また、マスキング部材６の円形孔部７の表面に溶射皮膜５が付着しにくい表面処理を施したり、円形孔部７自体を溶射皮膜５が付着しにくい材質とすることで、溶射後に付着した皮膜の除去を容易なものとすることができる。   In the present embodiment, since the diameter of the circular hole 7 formed in the masking member 6 is gradually increased from the lower end surface 6a toward the upper end surface 6b, the film adhered to the inner surface of the circular hole 7 is formed. The effect of preventing falling into the cylinder bore 2 during thermal spraying can be further enhanced, and the masking member 6 can be turned upside down after the thermal spraying to remove the coating adhered to the inner surface. In addition, the surface of the circular hole portion 7 of the masking member 6 is subjected to a surface treatment that makes it difficult for the sprayed coating 5 to adhere to it, or the circular hole portion 7 itself is made of a material that is difficult to adhere to the sprayed coating 5, thereby Can be easily removed.

図５は第１の実施の形態を示し、皮膜脱落防止手段の他の例を示す溶射皮膜形成用マスキング装置の要部拡大断面図である。この例では、円形孔部７の内面に複数個の凸部９Ｂを千鳥状に配置しており、その他の構成は前記実施の形態と同一の構成である。ここでの凸部９Ｂは、先端角度θを９０度未満としている。   FIG. 5 is an enlarged cross-sectional view of a principal part of a thermal spray coating forming masking apparatus showing the first embodiment and showing another example of the coating drop-off preventing means. In this example, a plurality of convex portions 9B are arranged in a staggered manner on the inner surface of the circular hole portion 7, and the other configurations are the same as those in the above embodiment. The convex portion 9B here has a tip angle θ of less than 90 degrees.

このように、円形孔部７の内面に複数個の凸部９Ｂを千鳥状に配置すれば、溶射皮膜５をこの凸部９Ｂに引っ掛けることができ、シリンダボア内壁２ａに形成された溶射皮膜５への皮膜の混入を防止することができる。特に、千鳥状に凸部９Ｂを配置すれば、この円形孔部７の内面に付着した皮膜の脱落防止をより一層効果的なものとすることができる。   As described above, if the plurality of convex portions 9B are arranged in a staggered manner on the inner surface of the circular hole portion 7, the thermal spray coating 5 can be hooked on the convex portion 9B, and the thermal spray coating 5 formed on the cylinder bore inner wall 2a. It is possible to prevent contamination of the film. In particular, if the convex portions 9B are arranged in a staggered manner, it is possible to further effectively prevent the film attached to the inner surface of the circular hole portion 7 from falling off.

「第２の実施の形態」
図６は第２の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射する前の状態を示す断面図、図７は第２の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射したときの状態を示す断面図、図８は第２の実施の形態を示し、溶射皮膜形成用マスキング装置の要部拡大断面図、図９は第２の実施の形態を示し、コイルバネの内表面に粗面部を形成した例を示す要部拡大斜視図である。 “Second Embodiment”
FIG. 6 shows a second embodiment, a cross-sectional view showing a state before thermal spray coating masking device is placed on the cylinder block upper end surface, and FIG. 7 shows the second embodiment. FIG. 8 is a cross-sectional view showing a state in which a coating formation masking device is disposed on the upper end surface of a cylinder block and sprayed, FIG. 9 is a main part enlarged perspective view showing an example in which a rough surface portion is formed on the inner surface of the coil spring according to the second embodiment.

第２の実施の形態では、第１の実施の形態と相違する部分についてのみ説明し、第１の実施の形態と同一構成部分についてはその説明は省略するものとする。   In the second embodiment, only the parts different from the first embodiment will be described, and the description of the same components as those in the first embodiment will be omitted.

第２の実施の形態における皮膜脱落防止手段８は、図６から図８に示すように、前記円形孔部７の内面に圧縮した状態で装着されたコイルバネ１０からなる。コイルバネ１０は、図８に示すように、円形孔部７の下端面６ａ近傍に形成された段差部１１にその下端部を載せ、上端面６ｂに設けられたコイル押さえ手段としての固定プレート１２とネジ１３で上端部を押さえられることで、圧縮力が付与されて前記円形孔部７の内面に装着される。   As shown in FIGS. 6 to 8, the film drop prevention means 8 in the second embodiment includes a coil spring 10 mounted in a compressed state on the inner surface of the circular hole 7. As shown in FIG. 8, the coil spring 10 is mounted on a stepped portion 11 formed in the vicinity of the lower end surface 6a of the circular hole 7, and a fixed plate 12 as a coil pressing means provided on the upper end surface 6b. By pressing the upper end portion with the screw 13, a compressive force is applied and the inner surface of the circular hole portion 7 is attached.

コイルバネ１０としては、円形孔部７から取り外されて自由長とされたときに、コイルピッチ間距離を約１ｍｍ以上開いた程度の寸法としたばね定数のものが使用される。また、このコイルバネ１０には、そのコイル内径Ｃを、前記シリンダボア２のボア内径Ｄと同一としたものが使用される。なお、コイルバネ１０の下端部を支える段差部１１の内径Ｅは、前記コイル内径Ｃよりも多少小さな寸法とされている。   As the coil spring 10, a spring constant having a dimension in which the distance between the coil pitches is opened by about 1 mm or more when it is removed from the circular hole 7 to have a free length is used. In addition, the coil spring 10 having the same coil inner diameter C as the bore inner diameter D of the cylinder bore 2 is used. The inner diameter E of the step portion 11 that supports the lower end portion of the coil spring 10 is slightly smaller than the inner diameter C of the coil.

また、コイルバネ１０の内表面には、図９に示すように、コイル長手方向に沿って断続的に粗い粗面部１４が形成されている。粗面部１４は、レーザ若しくはショットブラスなどによってその表面に傷を付けることで細かな凹凸として形成される。なお、粗面部１４は、断続的な浅い溝として線状に形成されていてもよい。   Further, as shown in FIG. 9, a rough surface portion 14 that is intermittently rough along the longitudinal direction of the coil is formed on the inner surface of the coil spring 10. The rough surface portion 14 is formed as fine irregularities by scratching the surface with a laser or shot brass. The rough surface portion 14 may be formed in a linear shape as an intermittent shallow groove.

このように、本実施の形態の溶射皮膜形成用マスキング装置６によれば、皮膜脱落防止手段８として円形孔部７の内面に圧縮した状態で装着させたコイルバネ１０を使用すれば、この円形孔部７の内面に皮膜が付着した場合でもコイルバネ１０を外すだけで皮膜の除去を簡単に行うことができる。   As described above, according to the masking device 6 for forming a thermal spray coating of the present embodiment, if the coil spring 10 mounted in a compressed state on the inner surface of the circular hole portion 7 is used as the coating drop-off preventing means 8, the circular hole Even when the film adheres to the inner surface of the portion 7, the film can be easily removed simply by removing the coil spring 10.

また、本実施の形態によれば、コイルバネ１０を使用していることから円形孔部７の内面に該コイルバネ１０を装着する際に、圧縮しながら組み付けることで隙間無く円形孔部７の内面に装着させることができる。   In addition, according to the present embodiment, since the coil spring 10 is used, when the coil spring 10 is attached to the inner surface of the circular hole portion 7, the coil spring 10 is attached to the inner surface of the circular hole portion 7 without any gaps by being assembled while being compressed. Can be attached.

また、本実施の形態によれば、コイルバネ１０のコイル内径Ｃをシリンダボア２のボア内径Ｄと同一としたので、溶射フレームの角度変化を防止し、膜厚を均一化することができる。   In addition, according to the present embodiment, since the coil inner diameter C of the coil spring 10 is the same as the bore inner diameter D of the cylinder bore 2, the change in the angle of the spray frame can be prevented and the film thickness can be made uniform.

また、本実施の形態によれば、固定プレート１２とネジ１３によるコイル押さえ手段でコイルバネ１０の上端部を押さえ付けて当該コイルバネ１０に圧縮力を付与しているので、簡単な構造でコイルバネ１０に圧縮力を与えることができる。   In addition, according to the present embodiment, the upper end portion of the coil spring 10 is pressed by the coil pressing means using the fixing plate 12 and the screw 13 to apply the compressive force to the coil spring 10, so that the coil spring 10 has a simple structure. A compressive force can be applied.

また、本実施の形態によれば、コイルバネ１０の内表面に線状若しくは断続的に面粗度の粗い粗面部１４を形成したので、その粗面部１４に優先的に皮膜が付着するため、溶射中の皮膜脱落を防止することができ除去も容易に行える。   Further, according to the present embodiment, since the rough surface portion 14 having a rough surface roughness is formed linearly or intermittently on the inner surface of the coil spring 10, the coating is preferentially attached to the rough surface portion 14. The film can be prevented from falling off and can be easily removed.

第１の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射する前の状態を示す断面図である。It is sectional drawing which shows 1st Embodiment and has shown the state before spraying by arrange | positioning the masking apparatus for thermal spray coating formation on a cylinder block upper end surface. 第１の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射したときの状態を示す断面図である。It is sectional drawing which shows a 1st Embodiment and shows a state when the thermal spray coating formation masking apparatus is arrange | positioned and sprayed on the cylinder block upper end surface. 第１の実施の形態を示し、溶射皮膜形成用マスキング装置の要部拡大断面図である。It is a principal part expanded sectional view of the masking apparatus for thermal spray coating which shows 1st Embodiment. 第１の実施の形態を示し、溶射皮膜形成用マスキング装置の内面に形成した皮膜脱落防止手段の要部拡大斜視図である。It is a principal part expansion perspective view of the film fall-off prevention means which showed 1st Embodiment and was formed in the inner surface of the masking apparatus for thermal spray coating formation. 第１の実施の形態を示し、皮膜脱落防止手段の他の例を示す溶射皮膜形成用マスキング装置の要部拡大断面図である。It is a principal part expanded sectional view of the masking apparatus for thermal spray film formation which shows 1st Embodiment and shows the other example of a film drop-off prevention means. 第２の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射する前の状態を示す断面図である。It is sectional drawing which shows 2nd Embodiment and has shown the state before spraying by arrange | positioning the masking apparatus for thermal spray coating formation on a cylinder block upper end surface. 第２の実施の形態を示し、溶射皮膜形成用マスキング装置をシリンダブロック上端面に配置して溶射したときの状態を示す断面図である。It is sectional drawing which shows a 2nd Embodiment and shows a state when the thermal spray coating formation masking apparatus is arrange | positioned and sprayed on the cylinder block upper end surface. 第２の実施の形態を示し、溶射皮膜形成用マスキング装置の要部拡大断面図である。It is a principal part expanded sectional view of the masking apparatus for thermal spray coating which shows 2nd Embodiment. 第２の実施の形態を示し、コイルバネの内表面に粗面部を形成した例を示す要部拡大斜視図である。It is a principal part expansion perspective view which shows 2nd Embodiment and shows the example which formed the rough surface part in the inner surface of a coil spring.

符号の説明Explanation of symbols

１…シリンダブロック
２…シリンダボア
２ａ…シリンダボア内壁
３…クランク室
５…溶射皮膜
６…マスキング部材
７…円形孔部
８…皮膜脱落防止手段
９…凹凸部
９Ａ…凹部
９Ｂ…凸部
１０…コイルバネ
１２…固定プレート
１３…ネジ DESCRIPTION OF SYMBOLS 1 ... Cylinder block 2 ... Cylinder bore 2a ... Cylinder bore inner wall 3 ... Crank chamber 5 ... Thermal spray coating 6 ... Masking member 7 ... Circular hole part 8 ... Film fall-off prevention means 9 ... Uneven part 9A ... Concave part 9B ... Convex part 10 ... Coil spring 12 ... Fixing plate 13 ... Screw

Claims (8)

シリンダブロックに形成されたシリンダボアの内壁に、溶融した溶滴を吹き付けて溶射皮膜を形成する際に、溶射皮膜の膜厚を均一にするためのマスキング部材を、前記シリンダブロックの上端に配置した溶射皮膜形成用マスキング装置であって、
前記マスキング部材の前記シリンダボアと連通する円形孔部の内面に、該マスキング部材の内面に吹き付けた溶滴が付着して形成される溶射皮膜の脱落を防止する皮膜脱落防止手段を設け、
前記円形孔部は、前記シリンダブロックの上端に配置される下端側から上端側に向かって次第にその直径を大とする
ことを特徴とする溶射皮膜形成用マスキング装置。 When the molten coating is sprayed on the inner wall of the cylinder bore formed on the cylinder block to form a sprayed coating, a masking member for uniformizing the thickness of the sprayed coating is disposed on the upper end of the cylinder block. A film forming masking device,
Provided on the inner surface of the circular hole portion communicating with the cylinder bore of the masking member is a coating drop prevention means for preventing the sprayed coating formed by adhering droplets sprayed on the inner surface of the masking member ;
2. The thermal spray coating masking apparatus according to claim 1, wherein the diameter of the circular hole portion gradually increases from the lower end side to the upper end side disposed at the upper end of the cylinder block . 請求項１に記載の溶射皮膜形成用マスキング装置であって、
前記皮膜脱落防止手段は、前記内面に形成された凹凸部から構成される
ことを特徴とする溶射皮膜形成用マスキング装置。 The thermal spray coating masking device according to claim 1,
The coating film falling prevention means is constituted by a concavo-convex portion formed on the inner surface. A thermal spray coating forming masking device. 請求項２に記載の溶射皮膜形成用マスキング装置であって、
前記凹凸部は、前記シリンダブロックの上端に配置される下端側から上端側へ向かって階段形状とされた
ことを特徴とする溶射皮膜形成用マスキング装置。 A thermal spray coating forming masking device according to claim 2,
The said uneven | corrugated | grooved part was made into step shape toward the upper end side from the lower end side arrange | positioned at the upper end of the said cylinder block. The masking apparatus for thermal spray coating formation characterized by the above-mentioned. 請求項２に記載の溶射皮膜形成用マスキング装置であって、
前記凹凸部は、複数個の凸部が千鳥状に配置された
ことを特徴とする溶射皮膜形成用マスキング装置。 A thermal spray coating forming masking device according to claim 2,
The uneven portion has a plurality of convex portions arranged in a staggered pattern. シリンダブロックに形成されたシリンダボアの内壁に、溶融した溶滴を吹き付けて溶射皮膜を形成する際に、溶射皮膜の膜厚を均一にするためのマスキング部材を、前記シリンダブロックの上端に配置した溶射皮膜形成用マスキング装置であって、
前記マスキング部材の前記シリンダボアと連通する円形孔部の内面に、該マスキング部材の内面に吹き付けた溶滴が付着して形成される溶射皮膜の脱落を防止する皮膜脱落防止手段を設け、
前記皮膜脱落防止手段は、前記円形孔部の内面に圧縮した状態で装着されたコイルバネからなる
ことを特徴とする溶射皮膜形成用マスキング装置。 When the molten coating is sprayed on the inner wall of the cylinder bore formed on the cylinder block to form a sprayed coating, a masking member for uniformizing the thickness of the sprayed coating is disposed on the upper end of the cylinder block. A film forming masking device ,
Provided on the inner surface of the circular hole portion communicating with the cylinder bore of the masking member is a coating drop prevention means for preventing the sprayed coating formed by adhering droplets sprayed on the inner surface of the masking member;
The coating film dropping prevention means comprises a coil spring mounted in a compressed state on the inner surface of the circular hole. 請求項５に記載の溶射皮膜形成用マスキング装置であって、
前記コイルバネの内径を、前記シリンダボアの内径と同一とした
ことを特徴とする溶射皮膜形成用マスキング装置。 A thermal spray coating forming masking device according to claim 5 ,
A masking device for forming a thermal spray coating, wherein the inner diameter of the coil spring is the same as the inner diameter of the cylinder bore. 請求項５に記載の溶射皮膜形成用マスキング装置であって、
前記コイルバネの上端部を、コイル押さえ手段で押さえ付けて当該コイルバネに圧縮力を付与した
ことを特徴とする溶射皮膜形成用マスキング装置。 A thermal spray coating forming masking device according to claim 5 ,
A thermal spray coating forming masking device, wherein the upper end portion of the coil spring is pressed by a coil pressing means to apply a compressive force to the coil spring. 請求項５から請求項７の何れか一つに記載の溶射皮膜形成用マスキング装置であって、
前記コイルバネの内表面に、線状若しくは断続的に面粗度の粗い粗面部を形成した
ことを特徴とする溶射皮膜形成用マスキング装置。 A thermal spray coating forming masking device according to any one of claims 5 to 7 ,
A masking device for forming a thermal spray coating, wherein a rough surface portion having a rough surface roughness is formed linearly or intermittently on the inner surface of the coil spring.
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