JP2018158414A - Blast treatment method - Google Patents

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JP2018158414A
JP2018158414A JP2017057252A JP2017057252A JP2018158414A JP 2018158414 A JP2018158414 A JP 2018158414A JP 2017057252 A JP2017057252 A JP 2017057252A JP 2017057252 A JP2017057252 A JP 2017057252A JP 2018158414 A JP2018158414 A JP 2018158414A
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projection
iron pipe
cast iron
flange surface
blasting
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JP6869766B2 (en
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健吾 明渡
Kengo Akewatari
健吾 明渡
忠 浦上
Tadashi Uragami
忠 浦上
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Kurimoto Ltd
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Abstract

PROBLEM TO BE SOLVED: To perform sufficient blast treatment to an end surface of a cast-iron pipe.SOLUTION: In a blast treatment method for performing blast treatment to a flange face 12 by projecting a projection material from a nozzle arranged oppositely to the flange face 12 of a cast-iron pipe 11 rotating around a shaft, a rotation direction r of the cast-iron pipe 11 at a projection part P to the flange face 12 of the projection material is opposite to a direction of a decomposition component to a rotation direction r of orthogonal projection to the flange face 12 in the projection direction S of the projection material.SELECTED DRAWING: Figure 3

Description

この発明は、水道管などに用いられる鋳鉄管のフランジ鋳出し部のブラスト処理方法に関する。   The present invention relates to a blasting method for a flange casting portion of a cast iron pipe used for a water pipe or the like.

水道管などに用いられる鋳鉄管（ダクタイル鋳鉄管）は、日本ダクタイル鉄管協会規格のＪＰＤＡ Ｚ２０１０（ダクタイル鋳鉄管合成樹脂塗装）、ＪＤＰＡ Ｔ５６（ＧＸ形ダクタイル鉄管）に規定されているように、耐食性を向上させるためにその表面に溶射を行うことが要求されている。この溶射は、耐食性を考慮した上で材料を選択し、その材料を溶融させて鋳鉄管に吹き付けることによって行なわれる。   Cast iron pipes (ductile cast iron pipes) used for water pipes, etc. have corrosion resistance as specified in JPDA Z2010 (ductile cast iron pipe synthetic resin coating) and JDPA T56 (GX type ductile iron pipe) of the Japan Ductile Iron Pipe Association standard. In order to improve, it is required to spray the surface. This thermal spraying is performed by selecting a material in consideration of corrosion resistance, melting the material, and spraying it on a cast iron pipe.

この溶射に先立って、鋳鉄管の表面に微小な投射材（スチールショット、スチールグリッドなど）を高速で衝突させるブラスト処理が一般的に行われる。ブラスト処理を行うことにより、表面に付着している塗料、赤錆などの被膜が除去されるとともに、鋳鉄管の表面粗度が高まり、その表面に形成された溶射による被膜の密着性を向上させることができる。   Prior to this thermal spraying, a blasting process is generally performed in which a fine projection material (steel shot, steel grid, etc.) is collided with the surface of the cast iron pipe at high speed. By performing the blasting process, coatings such as paint and red rust attached to the surface are removed, the surface roughness of the cast iron pipe is increased, and the adhesion of the coating formed by spraying on the surface is improved. Can do.

ブラスト処理方法としては、鋳鉄管を軸周りに回転させながら、その表面に対向して配置されたノズルから投射材を投射する種類があり、例えば、特許文献１に示す装置が用いられる。この装置は、管端に向かって管軸方向から投射材を噴射して、管端端面、管端内面、管端外面を同時に研磨することが可能な管端磨き装置である（特許文献１の段落００４５、図１など参照）。   As a blasting method, there is a type in which a projection material is projected from a nozzle arranged to face a surface of a cast iron pipe while rotating the cast iron pipe around the axis. For example, an apparatus shown in Patent Document 1 is used. This apparatus is a pipe end polishing apparatus capable of simultaneously polishing the pipe end end face, the pipe end inner face, and the pipe end outer face by injecting a projection material from the pipe axis direction toward the pipe end (Japanese Patent Application Laid-Open No. 2005-320542). (See paragraph 0045, FIG. 1, etc.).

特開２００２−１１６６７号公報JP 2002-11667 A

特許文献１に係る管端磨き装置は、鋳鉄管の端面および内外面を同時にブラスト処理できる一方で、端面の処理が不十分となることがある。その理由として、端面の鋳出し部に管種やロット番号などを示す凹状または凸状の刻印が形成されていることがあり、この刻印の奥まったところまで、投射材が十分に入り込まないことが挙げられる。ブラスト処理が不十分であると、溶射による被膜の密着性が低下して、剥離問題を生じる虞がある。   While the pipe end polishing apparatus according to Patent Document 1 can simultaneously blast the end face and the inner and outer faces of a cast iron pipe, the end face treatment may be insufficient. The reason for this is that a concave or convex marking indicating the pipe type or lot number may be formed on the casting portion of the end face, and the projection material may not sufficiently enter the depth of this marking. Can be mentioned. If the blasting treatment is insufficient, the adhesion of the coating film due to thermal spraying may be reduced, causing a peeling problem.

ブラスト処理を十分に行うべく、投射時間を長くしたり、投射材の粒度を小さくしたりすることが考えられる。しかしながら、投射時間を長くすると生産性が大幅に低下する問題が生じ、投射材の粒度を小さくすると表面粗度が低下して、溶射品質が損なわれる問題が生じる。   In order to sufficiently perform the blasting process, it is conceivable to increase the projection time or reduce the particle size of the projection material. However, if the projection time is lengthened, there is a problem that the productivity is significantly lowered, and if the particle size of the projection material is reduced, the surface roughness is lowered and the thermal spray quality is impaired.

そこで、この発明は、鋳鉄管の端面に対し十分なブラスト処理を行うことを課題とする。   Then, this invention makes it a subject to perform sufficient blasting with respect to the end surface of a cast iron pipe.

上記の課題を解決するため、この発明は、軸周りに回転する鋳鉄管のフランジ面に対向して配置されたノズルから投射材を投射し、前記フランジ面のブラスト処理を行うブラスト処理方法において、前記投射材の前記フランジ面への投射部における前記鋳鉄管の回転方向と、前記投射材の投射方向の前記フランジ面への正射影の前記回転方向への分解成分の方向とが対向していることを特徴とするブラスト処理方法を構成した。   In order to solve the above problems, the present invention is a blasting method for projecting a projection material from a nozzle disposed to face a flange surface of a cast iron pipe rotating around an axis, and performing a blasting process of the flange surface. The direction of rotation of the cast iron pipe in the projection portion of the projection material onto the flange surface and the direction of the decomposition component of the orthogonal projection of the projection direction of the projection material onto the flange surface are opposite to each other. A blasting method characterized by the above was constructed.

このように、前記投射材の前記フランジ面への投射部における前記鋳鉄管の回転方向と、前記投射材の投射方向の前記フランジ面への正射影の前記回転方向への分解成分の方向とを対向させることにより、ノズルから投射された投射材の勢いが衰えることなく鋳鉄管のフランジ面に当たる。このため、研掃性が向上して、フランジ面の表面に付着している塗料、赤錆などの被膜が効率良く除去されるとともに、鋳鉄管の表面の表面粗度が高まり、その表面に形成された溶射による被膜の密着性を向上させることができる。   Thus, the rotation direction of the cast iron pipe in the projection portion of the projection material onto the flange surface, and the direction of the decomposition component in the rotation direction of the orthogonal projection of the projection direction of the projection material onto the flange surface. By making it oppose, the momentum of the projection material projected from the nozzle hits the flange surface of the cast iron pipe without decreasing. For this reason, the sharpness is improved, and the paint, red rust, and other coatings adhering to the surface of the flange surface are efficiently removed, and the surface roughness of the cast iron pipe surface is increased and formed on the surface. The adhesion of the coating by spraying can be improved.

前記構成においては、前記フランジ面の面法線と前記投射方向とのなす投射角度が、５度以上４０度以下の範囲内である構成とするのが好ましい。   In the said structure, it is preferable to set it as the structure which the projection angle | corner which the surface normal of the said flange surface and the said projection direction make is in the range of 5 to 40 degree | times.

このように、前記フランジ面の面法線と前記投射方向とのなす投射角度を上記の範囲内とすることにより、ブラスト処理による優れた研掃性が発揮される。この投射角度を、５度よりも小さくすると端面の鋳出し部に形成された凹凸部の奥まで投射材が入り込まず、４０度よりも大きくすると投射材によるフランジ面の研掃性が低下し、いずれの場合も十分なブラスト処理を行うことが難しいため、いずれの場合も好ましくない。   As described above, when the projection angle formed by the surface normal of the flange surface and the projection direction is within the above range, excellent blasting by blasting is exhibited. When this projection angle is less than 5 degrees, the projection material does not enter the depths of the irregularities formed in the casting portion of the end surface, and when it is greater than 40 degrees, the sharpness of the flange surface by the projection material decreases, In either case, it is difficult to perform a sufficient blasting process.

前記各構成においては、前記フランジ面に対する前記投射部の移動速度が、１５．０ｍ／分以下である構成とするのが好ましい。   In each said structure, it is preferable to set it as the structure whose moving speed of the said projection part with respect to the said flange surface is 15.0 m / min or less.

このように、前記フランジ面に対する前記投射部の移動速度を上記とすると、フランジ面のブラスト処理を効率良くかつ十分に行うことができる。この移動速度を１５．０ｍ／分よりも大きくすると端面の鋳出し部に形成された凹凸部の奥まで投射材が入り込まず、十分なブラスト処理を行うことができないため好ましくない。   Thus, when the moving speed of the projection unit with respect to the flange surface is set as described above, the blasting of the flange surface can be performed efficiently and sufficiently. If the moving speed is higher than 15.0 m / min, the projection material does not enter the depths of the uneven portions formed in the casting portion of the end face, and it is not preferable because sufficient blasting cannot be performed.

この発明に係るブラスト処理方法は、投射材のフランジ面への投射部における鋳鉄管の回転方向と、前記投射材の投射方向の前記フランジ面への正射影の前記回転方向への分解成分の方向とが対向する構成としたので、ノズルから投射された投射材の勢いが衰えることなく鋳鉄管のフランジ面に当たる。このため、研掃性が向上して、フランジ面の表面に付着している塗料、赤錆などの被膜が除去されるとともに、鋳鉄管の表面が表面粗度が高まり、その表面に形成された溶射による被膜の密着性を向上させることができる。   The blasting method according to the present invention includes a rotation direction of the cast iron pipe in the projection portion to the flange surface of the projection material, and a direction of the decomposition component in the rotation direction of the orthogonal projection of the projection direction of the projection material on the flange surface. Since it is set as the structure which opposes, the momentum of the projection material projected from the nozzle hits the flange surface of a cast iron pipe, without decreasing. For this reason, the sharpness is improved, and coatings such as paint and red rust adhering to the surface of the flange surface are removed, and the surface roughness of the cast iron pipe is increased, and the thermal spray formed on the surface is increased. The film adhesion can be improved.

この発明に係るブラスト処理方法を行うブラスト装置の一例（概略）を示す断面図Sectional drawing which shows an example (outline) of the blasting apparatus which performs the blasting method which concerns on this invention 鋳鉄管の製造工程の一例（概略）を示すフローFlow showing an example (outline) of manufacturing process of cast iron pipe 鋳鉄管のフランジ面への投射材の投射方向を示す斜視図The perspective view which shows the projection direction of the projection material to the flange surface of a cast iron pipe 図３に示すフランジ面を管軸側から見た図Fig. 3 shows the flange surface shown in Fig. 3 as seen from the tube axis side.

この発明に係るブラスト処理方法は、図１に例示するブラスト装置を用いて行われる。このブラスト装置は、ブラスト処理を行う投射材（スチールグリッドなど）を噴射するノズル１０を備え、軸方向横向きにセットされた鋳鉄管１１の端部の鋳出し部（フランジ面１２）に投射材を投射して、このフランジ面１２のブラスト処理を行う機能を備えている。フランジ面１２に対し、ノズル１０は対向するように配置されている。このブラスト処理の間、鋳鉄管１１はローラ（図示せず）によって軸周りに回転される。また、鋳鉄管１１の受口には、管内に投射材が入り込むのを防止するマスキング部材１３が嵌め込まれる。   The blasting method according to the present invention is performed using the blasting apparatus illustrated in FIG. This blasting apparatus includes a nozzle 10 for injecting a projecting material (steel grid or the like) for performing a blasting process, and applies the projecting material to a casting portion (flange surface 12) at an end portion of the cast iron pipe 11 set sideways in the axial direction. It has a function of projecting and blasting the flange surface 12. The nozzle 10 is disposed so as to face the flange surface 12. During this blasting process, the cast iron pipe 11 is rotated around its axis by a roller (not shown). A masking member 13 for preventing the projection material from entering the pipe is fitted into the receiving port of the cast iron pipe 11.

鋳鉄管１１は、図２に概略で示すフローに従って製造される。まず、鋳造によって鋳鉄管１１が成形される（ステップＳ１０）。このとき、鋳鉄管１１の端部のフランジ面１２に、この鋳鉄管１１の種別やロット番号などを示す凹状または凸状の刻印１４が形成される。鋳造後に所定の焼鈍を行うことによって、その機械特性（強度、延性など）が所望値に調整される（ステップＳ１１）。   The cast iron pipe 11 is manufactured according to the flow schematically shown in FIG. First, the cast iron pipe 11 is formed by casting (step S10). At this time, a concave or convex marking 14 indicating the type and lot number of the cast iron pipe 11 is formed on the flange surface 12 at the end of the cast iron pipe 11. By performing predetermined annealing after casting, the mechanical properties (strength, ductility, etc.) are adjusted to desired values (step S11).

焼鈍後に受口および挿し口加工（周溝や突条などの形成）が行なわれ、鋳鉄管１１が最終形状とされる（ステップＳ１２）。最終形状とした鋳鉄管１１のフランジ面１２に、この発明に係るブラスト処理方法によるブラスト処理を行う（ステップＳ１３）。ブラスト処理に続いて、鋳鉄管１１の表面に耐食性を備えた被膜を形成する溶射が行なわれる（ステップＳ１４）。さらに、その溶射による被膜の上に塗装が行なわれる（ステップＳ１５）。最後に、製品の最終チェックが行なわれて出荷される（ステップＳ１６）。   After the annealing, the receiving port and the insertion port processing (formation of circumferential grooves, ridges, etc.) are performed, and the cast iron pipe 11 is made into a final shape (step S12). The flange surface 12 of the cast iron pipe 11 having the final shape is subjected to blasting by the blasting method according to the present invention (step S13). Subsequent to the blast treatment, thermal spraying is performed to form a coating having corrosion resistance on the surface of the cast iron pipe 11 (step S14). Further, coating is performed on the coating by thermal spraying (step S15). Finally, the product is finally checked and shipped (step S16).

溶射の前にブラスト処理を行うことにより、フランジ面１２の表面に付着している塗料、赤錆などの被膜が除去されるとともに、鋳鉄管１１の表面粗度が高まり、その表面に形成された溶射による被膜の密着性を向上させることができる。なお、このフロー中には記載されていないが、一連のフロー中に、鋳鉄管１１の他の部位（直部など）のブラスト加工や、塗装工程が別途行なわれることもある。   By performing a blast treatment before thermal spraying, coatings such as paint and red rust adhering to the surface of the flange surface 12 are removed, and the surface roughness of the cast iron pipe 11 is increased, and thermal spraying formed on the surface is performed. The film adhesion can be improved. Although not described in this flow, blast processing of other portions (such as straight portions) of the cast iron pipe 11 and a painting process may be separately performed during a series of flows.

図３および図４に、鋳鉄管１１のフランジ面１２への投射材の投射方向Ｓを示す。投射材は、投射部Ｐにおいてフランジ面１２に投射されている。鋳鉄管１１は、図３中および図４中に矢印ｒで示した方向に回転している。この投射方向Ｓは、フランジ面１２の面法線ｎと投射角度θをなしている。投射方向Ｓのフランジ面１２への正射影は、鋳鉄管１１（フランジ面１２）の回転方向の成分（回転方向成分Ｓ１）とこの回転方向成分と直交する方向の成分（直交方向成分Ｓ２）に分解することができる。 3 and 4 show the projection direction S of the projection material onto the flange surface 12 of the cast iron pipe 11. The projection material is projected onto the flange surface 12 at the projection portion P. The cast iron pipe 11 rotates in the direction indicated by the arrow r in FIG. 3 and FIG. The projection direction S forms a projection angle θ with the surface normal n of the flange surface 12. The orthogonal projection of the projection direction S onto the flange surface 12 includes a component in the rotational direction (rotational direction component S 1 ) of the cast iron pipe 11 (flange surface 12) and a component in the direction orthogonal to the rotational direction component (orthogonal direction component S 2). ).

ノズル１０は、投射材のフランジ面１２への投射部Ｐにおける鋳鉄管１１の回転方向ｒと、投射方向Ｓの回転方向成分Ｓ１の方向とが対向する方向となるように角度調整される。この投射角度θは、５度以上４０度以下の範囲内とされる。投射角度θをこの範囲内とすることにより、ブラスト処理による優れた研掃性が発揮される。この投射角度θの範囲は、１０度以上４０度以下、さらに、２０度以上３５度以下とするのが、研掃性のさらなる向上の点で好ましい。 Nozzle 10, and the rotation direction r of the cast iron pipe 11 in the projection portion P of the flange surface 12 of the projection material, the direction of rotation direction component S 1 in the projection direction S is the angle adjusted such that the opposite directions. The projection angle θ is in the range of 5 degrees to 40 degrees. By setting the projection angle θ within this range, excellent scouring performance by blasting is exhibited. The range of the projection angle θ is preferably not less than 10 degrees and not more than 40 degrees, and more preferably not less than 20 degrees and not more than 35 degrees from the viewpoint of further improving the sharpness.

また、鋳鉄管１１を軸方向横向きにセットした構成においては、投射方向Ｓの直交方向成分Ｓ２が小さくなるほど（すなわち、ノズル１０からの投射材の投射方向が水平に近付くほど）、相対的に回転方向成分Ｓ１が大きくなり、研掃性をさらに高めることができる。 Further, in the configuration that sets the cast iron pipe 11 axially sideways, the more perpendicular direction component S 2 of the projection direction S becomes smaller (i.e., as the projection direction of the projection material from the nozzle 10 approaches horizontal), relatively rotation direction component S 1 is increased, it is possible to further increase the research掃性.

以下において、鋳鉄管１１のブラスト処理試験の結果について説明する。
（１）鋳鉄管の回転方向と、投射方向の回転方向成分の方向との関係について
鋳鉄管１１の回転方向と、投射方向Ｓの回転方向成分Ｓ１の方向との関係（逆方向または同方向）が研掃性に与える影響について評価した。この評価試験においては、表１に示す条件でブラスト処理を行った。 Below, the result of the blasting test of the cast iron pipe 11 will be described.
(1) Regarding the relationship between the rotation direction of the cast iron pipe and the direction of the rotation direction component of the projection direction The relationship between the rotation direction of the cast iron pipe 11 and the direction of the rotation direction component S 1 of the projection direction S (reverse direction or same direction) ) Was evaluated on the effect on the sharpness. In this evaluation test, blasting was performed under the conditions shown in Table 1.

Figure 2018158414
Figure 2018158414

この試験結果から、鋳鉄管１１の回転方向ｒと、投射方向Ｓの回転方向成分Ｓ１の方向を逆方向とした場合、ブラスト処理を少なくとも２０秒間実施すれば、赤錆などが残存しない良好な仕上がり状態を得られることが確認できた（実施例１〜３）。その一方で、鋳鉄管１１の回転方向ｒと、投射方向Ｓの回転方向成分Ｓ１の方向を同方向とした場合、投射時間を十分長くすれば（３７秒）良好な仕上がり状態を得られる一方で（比較例３）、投射時間が短いと（２０、２５秒）、鋳出し部（特に、フランジ面１２に形成した刻印１４の周辺）に赤錆などが残存することが確認された（比較例１、２）。この試験結果より、鋳鉄管１１の回転方向と、投射方向Ｓの回転方向成分Ｓ１の方向を逆方向とすることにより、良好な仕上がり状態を得るための投射時間を大幅に短縮できることが分かる。 From the test results, the rotation direction r of the cast iron pipe 11, if the direction of rotation direction component S 1 in the projection direction S and a reverse, be carried blasting least 20 seconds, good finish does not remain such red rust It was confirmed that the state could be obtained (Examples 1 to 3). On the other hand, the rotation direction r of the cast iron pipe 11, if the direction of rotation direction component S 1 in the projection direction S and the same direction, if sufficiently long projection time (37 seconds) while for good finished state In (Comparative Example 3), when the projection time was short (20, 25 seconds), it was confirmed that red rust or the like remained in the cast-out part (particularly around the stamp 14 formed on the flange surface 12) (Comparative Example). 1, 2). From this test result, the rotation direction of the cast iron pipe 11, by the direction of the rotational direction component S 1 in the projection direction S opposite direction, it can be seen that significantly reduce the projection time for good finish state.

（２）フランジ面の面法線と投射方向のなす角度の影響について
鋳鉄管１１の回転方向ｒと、投射方向Ｓの回転方向成分Ｓ１の方向を逆方向とした条件において、フランジ面１２の面法線ｎと投射方向Ｓのなす角度が研掃性に与える影響について評価した。この評価試験においては、表２に示す条件でブラスト処理を行った。 (2) and the rotation direction r of the cast iron pipe 11 Influence of the angle of the surface normal and the projection direction of the flange surface, in conditions where the direction of the rotational direction component S 1 and the opposite direction of the projection direction S, of the flange surface 12 The effect of the angle formed by the surface normal n and the projection direction S on the sharpness was evaluated. In this evaluation test, blasting was performed under the conditions shown in Table 2.

Figure 2018158414
Figure 2018158414

この試験結果から、投射角度θを小さくした場合（θ＝３０度）、赤錆などが残存しない良好な仕上がり状態を得られることが確認できた（実施例４）。その一方で、投射角度θを大きくした場合（θ＝４５度）、鋳出し部（特に、フランジ面１２に形成した刻印１４の周辺）に赤錆などが残存することが確認された（比較例４）。この実施例４においては、投射角度θを３０度としたが、５度以上４０度以下の範囲内で、優れた研掃性が発揮される。
（３）投射部の移動速度の影響について
鋳鉄管１１の回転方向ｒと、投射方向Ｓの回転方向成分Ｓ１の方向を逆方向とした条件において、投射部Ｐの移動速度が研掃性に与える影響について評価した。この評価試験においては、表３に示す条件でブラスト処理を行った。 From this test result, it was confirmed that when the projection angle θ was reduced (θ = 30 degrees), a good finished state with no red rust remaining could be obtained (Example 4). On the other hand, when the projection angle θ was increased (θ = 45 degrees), it was confirmed that red rust or the like remained in the cast-out portion (particularly around the marking 14 formed on the flange surface 12) (Comparative Example 4). ). In Example 4, the projection angle θ is set to 30 degrees, but excellent sharpening properties are exhibited within the range of 5 degrees to 40 degrees.
(3) and the rotation direction r of the cast iron pipe 11 Effect of the moving speed of the projection section, the direction of rotation direction component S 1 in the projection direction S in the reverse direction and the conditions, the moving speed of the projection portion P is Ken掃性The effect was evaluated. In this evaluation test, blasting was performed under the conditions shown in Table 3.

Figure 2018158414
Figure 2018158414

この試験結果から、投射部Ｐの移動速度を小さくした場合（呼び径が７５ｍｍのとき９．０ｍ／分、呼び径が１００ｍｍのとき１０．５ｍ／分）、赤錆などが残存しない良好な仕上がり状態を得られることが確認できた（実施例５、６）。その一方で、投射部Ｐの移動速度を大きくした場合（呼び径が７５ｍｍのとき１８．０ｍ／分、呼び径が１００ｍｍのとき２１．０ｍ／分）、鋳出し部（特に、フランジ面１２に形成した刻印１４の周辺）に赤錆などが残存することが確認された（比較例５、６）。この実施例５、６においては、移動速度を９．０ｍ／分、または、１０．５ｍ／分としたが、１５．０ｍ／分以下の範囲内で、優れた研掃性が発揮される。なお、生産性の観点からは、移動速度を２．０ｍ／分以上とするのが好ましい。   From this test result, when the moving speed of the projection part P is reduced (9.0 m / min when the nominal diameter is 75 mm, 10.5 m / min when the nominal diameter is 100 mm), a good finished state in which no red rust remains, etc. (Examples 5 and 6). On the other hand, when the moving speed of the projection part P is increased (18.0 m / min when the nominal diameter is 75 mm, 21.0 m / min when the nominal diameter is 100 mm), the cast-out part (particularly on the flange surface 12). It was confirmed that red rust or the like remained in the vicinity of the formed stamp 14 (Comparative Examples 5 and 6). In Examples 5 and 6, the moving speed was set to 9.0 m / min or 10.5 m / min, but excellent scouring ability was exhibited within a range of 15.0 m / min or less. From the viewpoint of productivity, the moving speed is preferably set to 2.0 m / min or more.

上記の各試験条件（表１〜表３）でブラスト処理を行った鋳鉄管１１に溶射による被膜を形成し、クロスカット試験（テープ剥離試験）でその被膜の密着性を評価したところ、仕上がり状態（研掃性）が「○（残存なし）」と判断されたものにおいては高い密着性を有することが確認できた。その一方で、仕上がり状態（研掃性）が「×（鋳出し部に一部残存）」と判断されたものにおいては、部分的に剥離が生じることが確認できた。   When a coating film is formed by thermal spraying on the cast iron pipe 11 that has been blasted under the above test conditions (Tables 1 to 3), and the adhesion of the coating film is evaluated by a cross-cut test (tape peeling test), the finished state It was confirmed that those having a (sharpness) of “◯ (no residual)” have high adhesion. On the other hand, in the case where the finished state (abrasiveness) was determined to be “× (partially remaining in the casting portion)”, it was confirmed that partial peeling occurred.

上記の実施例は、各パラメータの組み合わせの中の一部を例示したのに過ぎず、鋳鉄管１１の端面に対し十分なブラスト処理を行う、というこの発明の課題を解決し得る限りにおいて、投射角度θ、移動速度などの諸条件を適宜決定することができる。また、上記で説明した以外の処理条件を新たに追加することも許容される。   In the above embodiment, only a part of the combinations of the parameters is illustrated, and as long as the problem of the present invention that sufficient blasting is performed on the end surface of the cast iron pipe 11 can be solved, the projection is performed. Various conditions such as the angle θ and the moving speed can be appropriately determined. It is also permitted to newly add processing conditions other than those described above.

１０ ノズル
１１ 鋳鉄管
１２ フランジ面
Ｐ 投射部
Ｓ 投射方向
Ｓ１ 回転方向成分
θ 投射角度
ｒ 回転方向
ｎ 面法線 DESCRIPTION OF SYMBOLS 10 Nozzle 11 Cast iron pipe 12 Flange surface P Projection part S Projection direction S One rotation direction component (theta) Projection angle r Rotation direction n Surface normal

Claims (3)

軸周りに回転する鋳鉄管（１１）のフランジ面（１２）に対向して配置されたノズル（１０）から投射材を投射し、前記フランジ面（１２）のブラスト処理を行うブラスト処理方法において、
前記投射材の前記フランジ面（１２）への投射部（Ｐ）における前記鋳鉄管（１１）の回転方向（ｒ）と、前記投射材の投射方向（Ｓ）の前記フランジ面（１２）への正射影の前記回転方向への分解成分の方向（Ｓ１）とが対向していることを特徴とするブラスト処理方法。 In a blasting method of projecting a projection material from a nozzle (10) arranged to face a flange surface (12) of a cast iron pipe (11) rotating around an axis, and performing a blasting process of the flange surface (12),
A rotation direction (r) of the cast iron pipe (11) in the projection part (P) to the flange surface (12) of the projection material and a projection direction (S) of the projection material to the flange surface (12). The blasting method according to claim 1 , wherein a direction (S 1 ) of the decomposition component in the rotation direction of the orthogonal projection is opposed. 前記フランジ面（１２）の面法線（ｎ）と前記投射方向（Ｓ）とのなす投射角度（θ）が、５度以上４０度以下の範囲内であることを特徴とする請求項１に記載のブラスト処理方法。   The projection angle (θ) formed by the surface normal (n) of the flange surface (12) and the projection direction (S) is in a range of 5 degrees to 40 degrees. The blasting method as described. 前記フランジ面（１２）に対する前記投射部（Ｐ）の移動速度が、１５．０ｍ／分以下であることを特徴とする請求項１または２に記載のブラスト処理方法。   The blasting method according to claim 1 or 2, wherein a moving speed of the projection part (P) with respect to the flange surface (12) is 15.0 m / min or less.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5364474A (en) * 1993-07-23 1994-11-15 Williford Jr John F Method for removing particulate matter
JPH07508686A (en) * 1992-06-22 1995-09-28 ミネソタ　マイニング　アンド　マニュファクチャリング　カンパニー Method and apparatus for removing waste from floptical media
JP2006346833A (en) * 2005-06-20 2006-12-28 Yamashita Rubber Co Ltd Blasting method
JP2014133908A (en) * 2013-01-08 2014-07-24 Kurimoto Ltd Blast processing apparatus for cast iron pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07508686A (en) * 1992-06-22 1995-09-28 ミネソタ　マイニング　アンド　マニュファクチャリング　カンパニー Method and apparatus for removing waste from floptical media
US5364474A (en) * 1993-07-23 1994-11-15 Williford Jr John F Method for removing particulate matter
JP2006346833A (en) * 2005-06-20 2006-12-28 Yamashita Rubber Co Ltd Blasting method
JP2014133908A (en) * 2013-01-08 2014-07-24 Kurimoto Ltd Blast processing apparatus for cast iron pipe

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