JP7104199B2 - Inner surface treatment device for pipes - Google Patents

Inner surface treatment device for pipes Download PDF

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JP7104199B2
JP7104199B2 JP2021041542A JP2021041542A JP7104199B2 JP 7104199 B2 JP7104199 B2 JP 7104199B2 JP 2021041542 A JP2021041542 A JP 2021041542A JP 2021041542 A JP2021041542 A JP 2021041542A JP 7104199 B2 JP7104199 B2 JP 7104199B2
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grindstone
surface treatment
tubular body
brush
polishing
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JP2021100782A (en
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裕也 森田
哲朗 長谷目
了 宍戸
憲次 中村
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Kurimoto Ltd
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Description

本発明は管体の内面処理装置に関する。 The present invention relates to an inner surface treatment device for a tubular body.

水道管などに広く使用される鋳鉄管は、内外径が一定な円筒形の直部と、その一端に設けられ内外径が直部より大きい受口と、他端に設けられ内径が直部と等しい挿し口とから構成されているものが多い。鋳鉄管は、管の鋳造後、焼鈍処理を行い、その後砥石によって内面研磨が行われる。通常、内面研磨が行われた後、管内に水圧をかけて水圧試験が行われ、錆取り等の下地処理が行われる。その後、管内を加熱した後、たとえば熱硬化性のエポキシ樹脂粉体塗料を投入して管の内面に樹脂層を形成する、いわゆる粉体塗装が行われる。 Cast iron pipes, which are widely used for water pipes, have a cylindrical straight part with a constant inner and outer diameter, a socket provided at one end of the cast iron pipe with a larger inner and outer diameter than the straight part, and a straight part provided at the other end with an inner diameter of the straight part. Many are composed of equal outlets. The cast iron pipe is annealed after the pipe is cast, and then the inner surface is polished with a grindstone. Usually, after the inner surface is polished, a water pressure test is performed by applying water pressure to the inside of the pipe, and a base treatment such as rust removal is performed. Then, after heating the inside of the pipe, for example, a thermosetting epoxy resin powder coating material is added to form a resin layer on the inner surface of the pipe, so-called powder coating is performed.

粉体塗装などの内面塗装が行われた鋳鉄管には、通常ピンホール検査が行われる。このピンホール検査は、ホリデーディテクタを用いて、塗膜のピンホール不良を検査するために行われる。このピンホール検査をクリアするために、鋳鉄管のピンホール不良を低減することは、鋳鉄管の生産性を向上させることにつながる。 Pinhole inspection is usually performed on cast iron pipes that have been internally coated, such as powder coating. This pinhole inspection is performed to inspect the coating film for pinhole defects using a holiday detector. Reducing pinhole defects in cast iron pipes in order to clear this pinhole inspection leads to improvement in the productivity of cast iron pipes.

このようなピンホール不良の対策として、たとえば特許文献１には、鋳鉄管内面に、回転させたミリングカッタを接触させ、回転するミリングカッタの刃によって管内表面をはつるようにして研削する鋳鉄管の内面処理方法が開示されている。 As a countermeasure against such pinhole defects, for example, Patent Document 1 describes a cast iron pipe in which a rotated milling cutter is brought into contact with the inner surface of the cast iron pipe, and the inner surface of the pipe is ground by the blade of the rotating milling cutter. The inner surface treatment method of is disclosed.

また、特許文献２には、鋳鉄管の内側に高周波コイルを挿入して残留水分を除去する、鋳鉄管の内面粉体塗装方法が開示されている。 Further, Patent Document 2 discloses a method of coating powder on the inner surface of a cast iron pipe by inserting a high frequency coil inside the cast iron pipe to remove residual moisture.

特開２００２－２００５１４号公報Japanese Unexamined Patent Publication No. 2002-2002 特開平５－１３１１６８号公報Japanese Unexamined Patent Publication No. 5-131168

上記特許文献１および２に開示された方法によって、ピンホール不良に対して一定の効果は期待できるものの、粉体塗装などの内面塗装が行われた鋳鉄管のピンホール不良をさらに低減させることが求められている。 Although a certain effect can be expected for pinhole defects by the methods disclosed in Patent Documents 1 and 2, it is possible to further reduce pinhole defects in cast iron pipes that have been internally coated such as powder coating. It has been demanded.

そこで、本発明はかかる問題点に鑑みて、ピンホール不良を低減することができる、管体の内面処理装置の提供を目的とする。 Therefore, in view of such a problem, an object of the present invention is to provide an inner surface treatment device for a pipe body, which can reduce pinhole defects.

本発明の管体の内面処理装置は、管体の内面を塗装する前に、管体の内面処理を行う内面処理装置であって、前記内面処理装置は、鋳造された前記管体の内面を研磨するために、前記管体の軸と略平行な軸周りに回転する砥石を備えた内面研磨装置と、前記砥石により研磨された後の前記管体の内面を研掃するために、前記管体の軸と略平行な軸周りに回転する研掃ブラシを備えた研掃装置とを備え、前記内面処理装置は、前記研掃ブラシを、前記砥石の回転方向とは逆方向に回転するように構成されていることを特徴とする。 The inner surface treatment device of the pipe body of the present invention is an inner surface treatment device that performs the inner surface treatment of the pipe body before painting the inner surface of the pipe body, and the inner surface treatment device is a cast inner surface of the pipe body. An inner surface polishing device provided with a grindstone that rotates about an axis substantially parallel to the axis of the tube body for polishing, and the tube for polishing the inner surface of the tube body after being polished by the grindstone. A sweeping device including a sweeping brush that rotates about an axis substantially parallel to the body axis is provided, and the inner surface treatment device rotates the sweeping brush in a direction opposite to the rotation direction of the grindstone. It is characterized by being configured in.

また、前記研掃ブラシは、前記研掃ブラシの回転軸に対して放射状に延びるホイールブラシであることが好ましい。 Further, the cleaning brush is preferably a wheel brush that extends radially with respect to the rotation axis of the cleaning brush.

本発明の管体の内面処理装置によれば、ピンホール不良を低減することができ、良好な塗装仕上がりを得ることができる。 According to the inner surface treatment device for a tube body of the present invention, pinhole defects can be reduced and a good coating finish can be obtained.

本発明の一実施形態の管体の内面処理方法のフローチャートである。It is a flowchart of the inner surface processing method of the tube body of one Embodiment of this invention. 管体の内面研磨工程に用いられる内面研磨装置を上側から見た概略図である。It is the schematic which looked at the inner surface polishing apparatus used for the inner surface polishing process of a tube body from the upper side. 管体（直部）の内面が内面研磨装置の砥石により研磨されている状態を示す概略図である。It is a schematic diagram which shows the state which the inner surface of a tube body (straight part) is polished by the grindstone of the inner surface polishing apparatus. 管体の研掃工程に用いられる研掃装置を上側から見た概略図である。It is the schematic which looked at the cleaning apparatus used for the cleaning process of a pipe body from the upper side. 管体の内面が研掃装置の研掃ブラシにより研掃されている状態を示す概略図である。It is the schematic which shows the state which the inner surface of a tube body is swept by the grind brush of a grind device.

以下、添付図面を参照し、本発明の一実施形態の管体の内面処理方法（以下、単に内面処理方法という）を説明する。なお、以下に説明する内面処理方法はあくまで一例であり、本発明の内面処理方法は、以下の実施形態に限定されるものではない。 Hereinafter, a method for treating the inner surface of a pipe body according to an embodiment of the present invention (hereinafter, simply referred to as a method for treating the inner surface) will be described with reference to the accompanying drawings. The inner surface treatment method described below is merely an example, and the inner surface treatment method of the present invention is not limited to the following embodiments.

図１に示されるように、本実施形態の内面処理方法は、鋳造工程Ｓ１、焼鈍工程Ｓ２、内面研磨工程Ｓ３、水圧試験工程Ｓ４、研掃工程Ｓ５、加熱工程Ｓ６、粉体塗装工程Ｓ７を有している。なお、上記工程はあくまで例示であり、さらに他の工程を有していてもよいし、所望の内面処理を行うことができれば、上記工程のうちの一部を変更しても構わない。 As shown in FIG. 1, the inner surface treatment method of the present embodiment includes a casting step S1, a annealing step S2, an inner surface polishing step S3, a hydraulic test step S4, a polishing step S5, a heating step S6, and a powder coating step S7. Have. It should be noted that the above steps are merely examples, and other steps may be included, and a part of the above steps may be changed as long as the desired inner surface treatment can be performed.

鋳造工程Ｓ１は、管体を鋳造する工程である。本実施形態では、管体は、受口、直部、挿し口を有する鋳鉄管である。鋳造工程Ｓ１の後には鋳鉄管に焼鈍処理を行うために、焼鈍工程Ｓ２が行われる。 The casting step S1 is a step of casting a pipe body. In the present embodiment, the pipe body is a cast iron pipe having a receiving port, a straight portion, and an insertion port. After the casting step S1, an annealing step S2 is performed in order to perform an annealing treatment on the cast iron pipe.

焼鈍工程Ｓ２が行われた後、管体の内面を砥石により研磨する内面研磨工程Ｓ３が行われる。砥石による内面研磨工程Ｓ３が行われた後、管内に水を満たし、所定の条件で内部の水を加圧し、水圧試験工程Ｓ４が行われる。 After the annealing step S2 is performed, the inner surface polishing step S3 is performed in which the inner surface of the pipe body is polished with a grindstone. After the inner surface polishing step S3 with a grindstone is performed, the inside of the pipe is filled with water, the water inside is pressurized under predetermined conditions, and the water pressure test step S4 is performed.

水圧試験工程Ｓ４が行われたのち、錆取り等の下地処理を行うために、研掃ブラシによる研掃工程Ｓ５が行われる。なお、研掃工程Ｓ５は、研掃ブラシによる研掃の前に、砥石を用いて錆取り研磨工程を行なってもよい。 After the water pressure test step S4 is performed, a cleaning step S5 using a cleaning brush is performed in order to perform a base treatment such as rust removal. In the cleaning step S5, a rust removing polishing step may be performed using a grindstone before cleaning with a polishing brush.

研掃工程Ｓ５が行われた後、粉体塗装を行うために、管体の内面を所定の温度まで加熱する加熱工程Ｓ６が行われる。加熱工程Ｓ６が行われた後、加熱された管体の内面に粉体塗料が塗布される粉体塗装工程Ｓ７が行われる。粉体塗装工程において用いられる粉体塗料は、たとえば、水道用のダクタイル鋳鉄管の場合、規格に適合したエポキシ粉体樹脂塗料を用いることができる。 After the cleaning step S5 is performed, a heating step S6 for heating the inner surface of the tubular body to a predetermined temperature is performed in order to perform powder coating. After the heating step S6 is performed, the powder coating step S7 is performed in which the powder coating is applied to the inner surface of the heated tube body. As the powder coating material used in the powder coating process, for example, in the case of a ductile cast iron pipe for water supply, an epoxy powder resin coating material conforming to the standard can be used.

以上の工程により、鋳鉄管の内面を塗装することができる。つぎに、本実施形態の内面処理方法に用いられる内面処理装置を説明する。図２は、管体の内面研磨工程Ｓ３に用いられる内面研磨装置を上側から見た概略図であり、図３は、管体（直部）の内面が内面研磨装置の砥石により研磨されている状態を示す概略図である。また、図４は、管体の研掃工程Ｓ５に用いられる研掃装置を上側から見た概略図であり、図５は、管体の内面が研掃装置の研掃ブラシにより研掃されている状態を示す概略図である。 By the above steps, the inner surface of the cast iron pipe can be painted. Next, the inner surface treatment apparatus used in the inner surface treatment method of the present embodiment will be described. FIG. 2 is a schematic view of the inner surface polishing device used in the inner surface polishing step S3 of the pipe body as viewed from above, and FIG. 3 shows that the inner surface of the pipe body (straight portion) is polished by the grindstone of the inner surface polishing device. It is the schematic which shows the state. Further, FIG. 4 is a schematic view of the cleaning device used in the cleaning step S5 of the pipe body as viewed from above, and FIG. 5 shows that the inner surface of the pipe body is cleaned by the cleaning brush of the cleaning device. It is the schematic which shows the state which is.

図２および図３に示されるように、内面研磨工程Ｓ３に用いられる内面研磨装置１は、管体Ｐの軸Ｘと略平行な軸周りに回転する砥石１１を有し、砥石１１により管体Ｐの内面Ｐａを研磨する。砥石１１は、図２および図３に示されるように、略円柱状であり、回転軸１２周りに回転しながら、管体Ｐの内面Ｐａを研磨する。砥石１１の回転軸１２周りの回転数は特に限定されないが、たとえば、５００～４０００ｒｐｍとすることができる。 As shown in FIGS. 2 and 3, the inner surface polishing device 1 used in the inner surface polishing step S3 has a grindstone 11 that rotates around an axis substantially parallel to the axis X of the tubular body P, and the tubular body is formed by the grindstone 11. The inner surface Pa of P is polished. As shown in FIGS. 2 and 3, the grindstone 11 has a substantially cylindrical shape, and polishes the inner surface Pa of the tubular body P while rotating around the rotation axis 12. The number of rotations of the grindstone 11 around the rotation shaft 12 is not particularly limited, but can be, for example, 500 to 4000 rpm.

内面研磨装置１は、本実施形態では、回転軸１２が接続される移動台車１３を有し、移動台車１３が管体Ｐの軸Ｘ方向に移動することにより、砥石１１を管体Ｐの軸Ｘ方向に移動させ、管体Ｐの軸Ｘ方向に研磨を行う。 In the present embodiment, the inner surface polishing device 1 has a moving carriage 13 to which the rotating shaft 12 is connected, and the moving carriage 13 moves in the axis X direction of the tubular body P to move the grindstone 11 to the shaft of the tubular body P. It is moved in the X direction and polished in the X direction of the axis P of the tubular body P.

また、内面研磨装置１は、管体Ｐを支持し、管体Ｐを軸Ｘ周りに回転させる図示しない管体回転装置を備え、管体Ｐが回転することにより、管体Ｐの内面Ｐａは砥石１１によって周方向で研磨される。管体Ｐの軸Ｘ周りの回転数は特に限定されないが、たとえば、２０～１２０ｒｐｍとすることができる。なお、管体Ｐを回転させずに、砥石１１を回転させる回転軸１２を管体Ｐの内面Ｐａに対して、周方向に移動させて管体Ｐの内面Ｐａを周方向に研磨しても構わない。 Further, the inner surface polishing device 1 includes a tube body rotating device (not shown) that supports the tube body P and rotates the tube body P around the axis X, and the rotation of the tube body P causes the inner surface Pa of the tube body P to be changed. It is polished in the circumferential direction by the grindstone 11. The number of rotations of the tube P around the axis X is not particularly limited, but can be, for example, 20 to 120 rpm. Even if the rotating shaft 12 that rotates the grindstone 11 is moved in the circumferential direction with respect to the inner surface Pa of the tubular body P without rotating the tubular body P, the inner surface Pa of the tubular body P is polished in the circumferential direction. I do not care.

本実施形態では、管体Ｐは、管体Ｐの受口側から見て時計回りに回転する。なお、管体Ｐは、管体Ｐの受口側から見て反時計回りに回転してもよい。また、本実施形態では、砥石１１は、管体Ｐの受口側から見て時計回り（管体Ｐと同方向）に回転する。なお、砥石１１は、管体Ｐの受口側から見て反時計回りに回転してもよい。 In the present embodiment, the tubular body P rotates clockwise when viewed from the receiving side of the tubular body P. The tubular body P may rotate counterclockwise when viewed from the receiving side of the tubular body P. Further, in the present embodiment, the grindstone 11 rotates clockwise (in the same direction as the tubular body P) when viewed from the receiving side of the tubular body P. The grindstone 11 may rotate counterclockwise when viewed from the receiving side of the tubular body P.

なお、本実施形態では、内面研磨装置１は、受口側と挿し口側とで一対設けられているが、内面研磨装置１は、受口および挿し口の一方から挿入される１つの内面研磨装置であっても構わない。 In the present embodiment, a pair of inner surface polishing devices 1 are provided on the receiving side and the insertion port side, but the inner surface polishing device 1 is one inner surface polishing device inserted from either the receiving port or the insertion port. It may be a device.

図４および図５に示されるように、研掃工程Ｓ５に用いられる研掃装置２は、管体Ｐの軸Ｘと略平行な軸周りに回転する研掃ブラシ２１を有し、研掃ブラシ２１により管体Ｐの内面Ｐａを研掃する。研掃ブラシ２１は、特に限定されないが、たとえば、研掃ブラシ２１の回転軸に対して、複数のワイヤが放射状に延びるホイールブラシとすることができる。本実施形態では、真鍮製の複数のワイヤを有するホイールブラシが用いられている。なお、研掃ブラシ２１の材料は特に限定されず、たとえばナイロン製等、他の材料のホイールブラシを用いても構わない。研掃ブラシ２１は、回転軸２２周りに回転しながら、管体Ｐの内面Ｐａを研掃し、水圧試験後の錆取りを行う。研掃ブラシ２１の回転軸２２周りの回転数は特に限定されないが、たとえば、５００～４０００ｒｐｍとすることができる。 As shown in FIGS. 4 and 5, the cleaning device 2 used in the cleaning step S5 has a cleaning brush 21 that rotates around an axis substantially parallel to the axis X of the tubular body P, and is a cleaning brush. 21 sweeps the inner surface Pa of the tubular body P. The cleaning brush 21 is not particularly limited, and may be, for example, a wheel brush in which a plurality of wires extend radially with respect to the rotation axis of the cleaning brush 21. In this embodiment, a wheel brush having a plurality of brass wires is used. The material of the cleaning brush 21 is not particularly limited, and a wheel brush made of another material such as nylon may be used. The sharpening brush 21 grinds the inner surface Pa of the tubular body P while rotating around the rotation shaft 22, and removes rust after the water pressure test. The number of rotations of the cleaning brush 21 around the rotation axis 22 is not particularly limited, but can be, for example, 500 to 4000 rpm.

研掃装置２は、本実施形態では、回転軸２２が接続される移動台車２３を有し、移動台車２３が管体Ｐの軸Ｘ方向に移動することにより、研掃ブラシ２１を管体Ｐの軸Ｘ方向に移動させ、管体Ｐの軸Ｘ方向に研掃を行う。 In the present embodiment, the cleaning device 2 has a moving carriage 23 to which the rotating shaft 22 is connected, and the moving carriage 23 moves in the axis X direction of the tubular body P to move the cleaning brush 21 to the tubular body P. Is moved in the axis X direction, and the pipe body P is cleaned in the axis X direction.

また、研掃装置２は、管体Ｐを支持し、管体Ｐを軸Ｘ周りに回転させる図示しない管体回転装置を備え、管体Ｐが回転することにより、管体Ｐの内面Ｐａは研掃ブラシ２１によって周方向で研掃される。管体Ｐの軸Ｘ周りの回転数は特に限定されないが、たとえば、３０～１２０ｒｐｍとすることができる。なお、管体Ｐを回転させずに、研掃ブラシ２１を回転させる回転軸２２を管体Ｐの内面Ｐａに対して、周方向に移動させて管体Ｐの内面Ｐａを周方向に研掃しても構わない。 Further, the cleaning device 2 includes a pipe body rotating device (not shown) that supports the pipe body P and rotates the pipe body P around the axis X, and the rotation of the pipe body P causes the inner surface Pa of the pipe body P to be changed. It is wiped in the circumferential direction by the sharpening brush 21. The number of rotations of the tube P around the axis X is not particularly limited, but can be, for example, 30 to 120 rpm. The rotating shaft 22 for rotating the cleaning brush 21 is moved in the circumferential direction with respect to the inner surface Pa of the tubular body P without rotating the tubular body P, and the inner surface Pa of the tubular body P is cleaned in the circumferential direction. You may.

本実施形態では、研掃ブラシ２１は、内面研磨工程における砥石１１と逆方向に回転するように構成されている。すなわち、砥石１１が受口側から見て時計回りに回転する場合には、研掃ブラシ２１は受口側から見て反時計回りに回転し、砥石１１が受口側から見て反時計回りに回転する場合には、研掃ブラシ２１は受口側から見て時計回りに回転する。なお、研掃工程Ｓ５において、本実施形態では、管体Ｐは、管体Ｐの受口側から見て反時計回りに回転し、研掃ブラシ２１も反時計回り（管体Ｐと同方向）に回転するように構成されているが、管体Ｐの回転方向は、時計回りであっても構わない。 In the present embodiment, the polishing brush 21 is configured to rotate in the direction opposite to that of the grindstone 11 in the inner surface polishing step. That is, when the grindstone 11 rotates clockwise when viewed from the receiving side, the cleaning brush 21 rotates counterclockwise when viewed from the receiving side, and the grindstone 11 rotates counterclockwise when viewed from the receiving side. When rotating to, the cleaning brush 21 rotates clockwise when viewed from the receiving side. In the cleaning step S5, in the present embodiment, the tubular body P rotates counterclockwise when viewed from the receiving side of the tubular body P, and the cleaning brush 21 also rotates counterclockwise (in the same direction as the tubular body P). ), But the direction of rotation of the tubular body P may be clockwise.

本発明者らは、上述したように、研掃工程Ｓ５における研掃ブラシ２１を、内面研磨工程Ｓ３における砥石１１と逆方向に回転させることにより、以下の実施例に示されるように、ピンホール率を大幅に低減させることができることを見出した。 As described above, the present inventors rotate the cleaning brush 21 in the cleaning step S5 in the direction opposite to that of the grindstone 11 in the inner surface polishing step S3, thereby causing pinholes as shown in the following examples. We have found that the rate can be significantly reduced.

つぎに、実施例および比較例を挙げて本発明を具体的に説明するが、本発明はこれらの実施例のみに限定されるものではない。 Next, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

実施例１～３、比較例１～３、参考例１～３のそれぞれについて、図２～図５に示される内面研磨装置１および研掃装置２を同様の条件で稼働し、上述した工程Ｓ１～Ｓ７により、所定数の鋳鉄管を合計２３０７本製造した。なお、実施例、比較例、参考例について、それぞれ水圧試験工程Ｓ４と研掃工程Ｓ５との間に、内面研磨装置１と同様の装置、同様の条件で、砥石による錆取り研磨を行なった。 For each of Examples 1 to 3, Comparative Examples 1 to 3, and Reference Examples 1 to 3, the inner surface polishing device 1 and the cleaning device 2 shown in FIGS. 2 to 5 were operated under the same conditions, and the above-described step S1 was performed. A total of 2307 cast iron pipes were produced in accordance with S7. In each of Examples, Comparative Examples, and Reference Examples, rust removal polishing with a grindstone was performed between the hydraulic test step S4 and the polishing step S5 with the same device as the inner surface polishing device 1 and under the same conditions.

（研磨および研掃条件）
実施例１～３については、内面研磨工程Ｓ３において、管体Ｐおよび砥石１１を受口側から見て右周り（時計回り）に回転させ、錆取り研磨工程においては、管体Ｐおよび砥石を受口側から見て左周り（反時計回り）に回転させ、研掃工程Ｓ５においては、管体Ｐおよび研掃ブラシ２１を受口側から見て左回り（反時計回り）に回転させた。 (Polishing and cleaning conditions)
In Examples 1 to 3, in the inner surface polishing step S3, the tubular body P and the grindstone 11 are rotated clockwise when viewed from the receiving side, and in the rust removing polishing step, the tubular body P and the grindstone are received. It was rotated counterclockwise (counterclockwise) when viewed from the mouth side, and in the polishing step S5, the tubular body P and the polishing brush 21 were rotated counterclockwise (counterclockwise) when viewed from the receiving side.

比較例１～３については、内面研磨工程Ｓ３において、管体Ｐおよび砥石１１を受口側から見て右周りに回転させ、錆取り研磨工程においては、管体Ｐおよび砥石を受口側から見て左周りに回転させ、研掃工程Ｓ５においては、管体Ｐを受口側から見て左回りに、研掃ブラシ２１を受口側から見て右回りに回転させた。 In Comparative Examples 1 to 3, in the inner surface polishing step S3, the tubular body P and the grindstone 11 were rotated clockwise when viewed from the receiving side, and in the rust removing polishing step, the tubular body P and the grindstone were viewed from the receiving side. In the cleaning step S5, the tubular body P was rotated counterclockwise when viewed from the receiving side, and the polishing brush 21 was rotated clockwise when viewed from the receiving side.

参考例１～３については、内面研磨工程Ｓ３において、管体Ｐおよび砥石１１を受口側から見て右周りに回転させ、錆取り研磨工程においては、管体Ｐおよび砥石を受口側から見て右周りに回転させ、研掃工程Ｓ５においては、管体Ｐを受口側から見て左回りに、研掃ブラシ２１を受口側から見て右回りに回転させた。 Regarding Reference Examples 1 to 3, in the inner surface polishing step S3, the tubular body P and the grindstone 11 are rotated clockwise when viewed from the receiving side, and in the rust removing polishing step, the tubular body P and the grindstone are viewed from the receiving side. In the polishing step S5, the tubular body P was rotated counterclockwise when viewed from the receiving side, and the polishing brush 21 was rotated clockwise when viewed from the receiving side.

上述した方法により塗装した鋳鉄管について、ホリデーディテクタを用いたピンホール検査によりピンホール率を算出し、通常行われると思われる、内面研磨工程Ｓ３、錆取り研磨工程、研掃工程Ｓ５における砥石と研掃ブラシとを全て同方向（全て右周り）に回転させた参考例１～３に対するピンホール率の低下度（（実施例または比較例のピンホール率）／（参考例のピンホール率））を算出した。評価基準を以下に示す。 For the cast iron pipe painted by the above method, the pinhole ratio is calculated by a pinhole inspection using a holiday detector, and the grindstone and polishing in the inner surface polishing step S3, the rust removing polishing step, and the polishing step S5, which are considered to be normally performed. Degree of decrease in pinhole rate with respect to Reference Examples 1 to 3 in which the sweep brush is rotated in the same direction (all clockwise) ((Pinhole rate in Example or Comparative Example) / (Pinhole rate in Reference Example)) Was calculated. The evaluation criteria are shown below.

（評価基準）
◎：ピンホール率の低下度が、参考例の１／４以下となったもの
○：ピンホール率の低下度が、参考例の１／４～１／２となったもの
△：ピンホール率の低下度が、参考例の１／２～３／４となったもの
▲：ピンホール率の低下度が、参考例の３／４～１となったもの
×：ピンホール率が参考例以上であったもの
上述の評価基準により評価した結果を表１に示す。 (Evaluation criteria)
⊚: The degree of decrease in the pinhole rate is 1/4 or less of the reference example ○: The degree of decrease in the pinhole rate is 1/4 to 1/2 of the reference example Δ: Pinhole rate The degree of decrease in the pinhole rate was 1/2 to 3/4 of the reference example. ▲: The degree of decrease in the pinhole rate was 3/4 to 1 in the reference example. ×: The pinhole rate was higher than that of the reference example. Table 1 shows the results of evaluation based on the above evaluation criteria.

Figure 0007104199000001
Figure 0007104199000001

表１に示されるように、内面研磨工程Ｓ３と研掃工程Ｓ５とで、砥石１１と研掃ブラシ２１とを逆方向に回転させた実施例１～３は、内面研磨工程Ｓ３と研掃工程Ｓ５とで、砥石１１と研掃ブラシ２１とを同方向に回転させた比較例１～３および参考例１～３に対して、顕著なピンホール率の低下をもたらすことがわかった。また、比較例１～３と参考例１～３により、内面研磨工程Ｓ３での砥石１１と、錆取り研磨工程での砥石とを逆方向に回転させたとしても、ピンホール率が低下しないことがわかった。以上から、内面研磨工程Ｓ３における砥石１１の回転方向と、研掃工程Ｓ５における研掃ブラシ２１の回転方向とが逆方向であることに意味があることがわかり、この場合に非常に優れたピンホール率の低下をもたらすことがわかる。 As shown in Table 1, in Examples 1 to 3 in which the grindstone 11 and the polishing brush 21 are rotated in opposite directions in the inner surface polishing step S3 and the cleaning step S5, the inner surface polishing step S3 and the cleaning step are performed. It was found that in S5, the pinhole rate was significantly reduced with respect to Comparative Examples 1 to 3 and Reference Examples 1 to 3 in which the grindstone 11 and the polishing brush 21 were rotated in the same direction. Further, according to Comparative Examples 1 to 3 and Reference Examples 1 to 3, the pinhole rate does not decrease even if the grindstone 11 in the inner surface polishing step S3 and the grindstone in the rust removing polishing step are rotated in opposite directions. all right. From the above, it can be seen that it is meaningful that the rotation direction of the grindstone 11 in the inner surface polishing step S3 and the rotation direction of the polishing brush 21 in the polishing step S5 are opposite directions, and in this case, a very excellent pin. It can be seen that the hole rate is reduced.

上述したように、本発明の管体の内面処理方法によれば、ピンホール率を大きく低減することができ、ピンホール不良を低減することができる。これにより、管体の良好な塗装仕上がりを得ることができる。また、内面研磨工程における砥石の回転方向と、研掃工程における研掃ブラシの回転方向とを逆方向にするという簡単な方法でピンホール不良を低減することができるため、鋳鉄管の生産性が向上する。また、本発明によれば、従来のように、ピンホール不良を低減させるために、内面塗装の膜厚を厚くする必要がなく、生産コストを低下させることもできる。 As described above, according to the method for treating the inner surface of the tube body of the present invention, the pinhole rate can be significantly reduced, and pinhole defects can be reduced. Thereby, a good coating finish of the tube body can be obtained. Further, since the pinhole defect can be reduced by a simple method of reversing the rotation direction of the grindstone in the inner surface polishing process and the rotation direction of the polishing brush in the polishing process, the productivity of the cast iron pipe can be improved. improves. Further, according to the present invention, it is not necessary to increase the film thickness of the inner coating in order to reduce pinhole defects as in the conventional case, and the production cost can be reduced.

上記実施形態の内面処理方法では、粉体塗装が行われる鋳鉄管の内面処理を例にあげて説明したが、管体は鋳鉄管に限定されるものではない。また、上記実施形態の内面処理方法では、管体の内面に粉体塗料を塗布する場合を例にあげて説明したが、粉体塗料と同様のピンホール不良が生じ得る他の合成樹脂塗料や、粉体塗料と珪砂など他の材料との混合物を塗布する場合にも、上記内面処理方法を適用することができる。 In the inner surface treatment method of the above embodiment, the inner surface treatment of a cast iron pipe to which powder coating is performed has been described as an example, but the pipe body is not limited to the cast iron pipe. Further, in the inner surface treatment method of the above embodiment, the case where the powder paint is applied to the inner surface of the tubular body has been described as an example, but other synthetic resin paints and other synthetic resin paints which may cause pinhole defects similar to the powder paint may be used. The above-mentioned inner surface treatment method can also be applied when a mixture of a powder coating material and another material such as silica sand is applied.

なお、上記実施形態の内面処理方法では、内面研磨工程の後に水圧試験工程が行われる構成としたが、内面研磨工程の前に水圧試験工程が行われる構成としてもよい。 In the inner surface treatment method of the above embodiment, the water pressure test step is performed after the inner surface polishing step, but the water pressure test step may be performed before the inner surface polishing step.

１ 内面研磨装置
１１ 砥石
１２ 回転軸
１３ 移動台車
２ 研掃装置
２１ 研掃ブラシ
２２ 回転軸
２３ 移動台車
Ｐ 管体
Ｐａ 管体の内面
Ｓ１ 鋳造工程
Ｓ２ 焼鈍工程
Ｓ３ 内面研磨工程
Ｓ４ 水圧試験工程
Ｓ５ 研掃工程
Ｓ６ 加熱工程
Ｓ７ 粉体塗装工程
Ｘ 管体の軸Ｘ 1 Inner surface polishing device 11 Grinding stone 12 Rotating shaft 13 Moving trolley 2 Cleaning device 21 Cleaning brush 22 Rotating shaft 23 Moving trolley P Tube body Pa Tube inner surface S1 Casting process S2 Burning process S3 Inner surface polishing process S4 Hydraulic test process S5 Sweeping process S6 Heating process S7 Powder coating process X Tube shaft X

Claims (2)

管体の内面を塗装する前に、管体の内面処理を行う内面処理装置であって、前記内面処理装置は、
鋳造された前記管体の内面を研磨するために、前記管体の軸と略平行な軸周りに回転する砥石を備えた内面研磨装置と、
前記砥石により研磨された後の前記管体の内面を研掃するために、前記管体の軸と略平行な軸周りに回転する研掃ブラシを備えた研掃装置と
を備え、
前記内面処理装置は、前記研掃ブラシを、前記砥石の回転方向とは逆方向に回転するように構成されている、管体の内面処理装置。 An inner surface treatment device that performs inner surface treatment of a pipe body before painting the inner surface of the pipe body, and the inner surface treatment device is
An inner surface polishing device equipped with a grindstone that rotates around an axis substantially parallel to the axis of the tube in order to polish the inner surface of the cast tube.
In order to clean the inner surface of the tube after being polished by the grindstone, a sweeping device equipped with a sweep brush that rotates around an axis substantially parallel to the axis of the tube is provided.
The inner surface treatment device is an inner surface treatment device for a pipe body, which is configured to rotate the cleaning brush in a direction opposite to the rotation direction of the grindstone. 前記研掃ブラシは、前記研掃ブラシの回転軸に対して放射状に延びるホイールブラシである請求項１記載の管体の内面処理装置。 The inner surface treatment device for a pipe body according to claim 1, wherein the cleaning brush is a wheel brush that extends radially with respect to the rotation axis of the cleaning brush.
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