JP7036778B2

JP7036778B2 - Metal tube inner surface electropolishing method, metal tube inner surface electropolishing device and metal tube inner surface electropolishing device usage

Info

Publication number: JP7036778B2
Application number: JP2019173661A
Authority: JP
Inventors: 義人岡部
Original assignee: TOSTE CO.,LTD.
Current assignee: TOSTE CO.,LTD.
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2022-03-15
Anticipated expiration: 2039-09-25
Also published as: JP2021050383A

Description

本件発明は、電解研磨の際に発生するガスによる悪影響を低減し、表面仕上げを良好なものとする金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法に関する。 The present invention relates to a metal tube inner surface electrolytic polishing method , a metal tube inner surface electrolytic polishing device, and a metal tube inner surface electrolytic polishing device , which reduce the adverse effects of gas generated during electrolytic polishing and improve the surface finish. ..

食品プラント、薬品プラント、化学プラント、半導体製造プラント等の配管に用いられるステンレス管等の金属管では、内面に雑菌、ゴミ等が付着残存すると、プラントによって製造しようとする製品の品質を悪化させることとなるため、ミクロン単位で平滑な光沢面が得られる電解研磨方法が、金属管内面の表面の仕上げのために広く用いられている。 In metal pipes such as stainless steel pipes used for piping in food plants, chemical plants, chemical plants, semiconductor manufacturing plants, etc., if germs, dust, etc. adhere to the inner surface, the quality of the product to be manufactured by the plant deteriorates. Therefore, an electrolytic polishing method that can obtain a smooth glossy surface in micron units is widely used for finishing the surface of the inner surface of a metal tube.

例えば、特許文献１には、［図３］に断面模式図で示すように、金属管１１に支持体１２、１３で管内面と間隔を保って電極１４を支持し、金属管１１の長手方向にこの電極１４を移動させると共に、金属管１１内に電解液１５を流動させる金属管１１内面の電解研磨方法が記載されている。しかしながら、特許文献１記載の電解研磨方法では、電解研磨の際に発生するガス（以下、「発生ガス」ともいう。）が金属管１１の内面上部に滞留するため、電解研磨を均一かつ良好に行うことは困難である。 For example, in Patent Document 1, as shown in a schematic cross-sectional view in FIG. 3, the metal tube 11 is supported by the supports 12 and 13 with the electrodes 14 at a distance from the inner surface of the tube, and the metal tube 11 is supported in the longitudinal direction. Describes a method for electrolytically polishing the inner surface of a metal tube 11 in which the electrode 14 is moved and the electrolytic solution 15 is allowed to flow in the metal tube 11. However, in the electrolytic polishing method described in Patent Document 1, the gas generated during the electrolytic polishing (hereinafter, also referred to as “generated gas”) stays in the upper part of the inner surface of the metal tube 11, so that the electrolytic polishing can be performed uniformly and satisfactorily. It's difficult to do.

このような発生ガスを金属管外に逃がす手法が、特許文献２および３に記載されている。 Patent Documents 2 and 3 describe methods for releasing such generated gas to the outside of the metal tube.

特許文献２には、［図４］に断面模式図で示すように、金属管２１の内周面に、電極管２２の絶縁隔壁２３を当接させながら所定位置まで挿入した後、電解研磨液を、接続用ホース２４、電極管２２内、および、電極管２２の先端部に穿設されている電解研磨液供給孔２５を通じて金属管２２内に供給し、電極管２２に通電して電解研磨を行うことが記載されている。しかしながら、特許文献２の電解研磨方法は、次のような理由で、通常の長い金属管の電解研磨には適さないものである。１）電極管２２全体に通電することから、通常の長い金属管の電解研磨に適用すると大きな電力が必要となる。２）金属管２１の内部の電解研磨液の流れが層流にならないため、長い金属管の内面を均一に電解研磨することが難しい。 In Patent Document 2, as shown in a schematic cross-sectional view in FIG. 4, the insulating partition 23 of the electrode tube 22 is inserted into a predetermined position while being in contact with the inner peripheral surface of the metal tube 21, and then an electrolytic polishing solution is provided. Is supplied into the metal tube 22 through the connection hose 24, the inside of the electrode tube 22, and the electrolytic polishing liquid supply hole 25 drilled at the tip of the electrode tube 22, and the electrode tube 22 is energized for electrolytic polishing. Is described to do. However, the electrolytic polishing method of Patent Document 2 is not suitable for electrolytic polishing of a normal long metal tube for the following reasons. 1) Since the entire electrode tube 22 is energized, a large amount of electric power is required when applied to ordinary electrolytic polishing of a long metal tube. 2) Since the flow of the electrolytic polishing liquid inside the metal tube 21 does not become a laminar flow, it is difficult to uniformly electrolytically polish the inner surface of the long metal tube.

また、特許文献３には、［図５］に外観模式図で示すように、電解槽３１内に被研磨体である金属管３２を縦置して電解研磨を行うことが記載されている。しかしながら、特許文献３の電解研磨方法は、電解槽３１の高さを金属管３２の高さ以上とする必要があり、多量の電解液を必要とする、電解槽３１が不安定で転倒しやすい、作業性が低下する等の問題がある。 Further, Patent Document 3 describes that a metal tube 32, which is an object to be polished, is vertically placed in an electrolytic cell 31 to perform electrolytic polishing, as shown in a schematic external diagram in FIG. However, in the electrolytic polishing method of Patent Document 3, the height of the electrolytic cell 31 needs to be equal to or higher than the height of the metal tube 32, a large amount of electrolytic solution is required, and the electrolytic cell 31 is unstable and easily overturned. , There are problems such as deterioration of workability.

特開昭６１－２３６４２６号公報Japanese Unexamined Patent Publication No. 61-236426 特開平５－２７９９００号公報Japanese Unexamined Patent Publication No. 5-279900 特開平７－２６６１３４号公報Japanese Unexamined Patent Publication No. 7-266134

本件発明は、通常の長い金属管に対して、金属管内面の電解研磨を均一かつ良好に行うことができ、かつ、効率良く電解研磨を行うことのできる、金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法を提供することを課題とする。 INDUSTRIAL APPLICABILITY The present invention is a method for electropolishing the inner surface of a metal tube, which can perform electropolishing of the inner surface of a metal tube uniformly and satisfactorily and efficiently for an ordinary long metal tube. It is an object of the present invention to provide a method of using a surface electrolytic polishing device and a metal tube inner surface electrolytic polishing device .

本件発明者等は、通常の長い金属管に対して、金属管内面の電解研磨を均一かつ良好に行うことができ、かつ、効率良く電解研磨を行うことのできる電解研磨について鋭意検討し、本件発明を成したものである。 The inventors of the present invention have diligently studied electrolytic polishing of an ordinary long metal tube, which can uniformly and satisfactorily perform electrolytic polishing of the inner surface of the metal tube and efficiently perform electrolytic polishing. It was the invention.

本件発明の要旨を以下に示す。
（１）金属管内に電解液を循環させると共に、前記金属管内面と間隔を保ちながら電極を移動させる金属管内面電解研磨方法であって、
前記金属管を鉛直方向に立てた状態で電解研磨が行われ、
前記金属管を鉛直方向に立てた後に、前記金属管の下端部および上端部に閉鎖部材を装着し、
前記下端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内に流入させ、前記上端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内から排出させ、
前記閉鎖部材が下記ａ）～ｄ）の構造を有しており、前記金属管の両端部への前記閉鎖部材の装着が、前記閉鎖部材の開口部側を前記金属管の両端部の外側にはめ込んで行われる、金属管内面電解研磨方法。
ａ）円筒形の側部およびこの側部の一端に底部、他端に開口部を有する
ｂ）前記底部の側には、前記金属管と同じ内径および外径を有するダミー管が内装されている
ｃ）前記開口部の内径は、前記金属管の外径と同じである
ｄ）前記底部には、前記電解液を通す貫通孔（電解液流入口または電解液排出口）が設けられている
（２）前記金属管を鉛直方向に立てた状態において、前記金属管の上端に装着される前記閉鎖部材の前記底部側には、装着前に前記電極が収納されている、（１）に記載の金属管内面電解研磨方法。
（３）前記金属管の両端部に前記閉鎖部材を装着し、前記閉鎖部材を通して前記金属管内に前記電解液を循環させ、前記電極を、一旦、前記金属管の上端に装着された前記閉鎖部材から、前記金属管の下端に装着された前記閉鎖部材に移動させた後に、前記電極を上昇させながら電解研磨を行う、（１）または（２）に記載の金属管内面電解研磨方法。
（４）前記電極は、表面に樹脂製の接触防止ガイドを有しており、上端に接続された電極棒によって支持され、前記電極棒の出し入れによって、前記金属管の内側を上下方向に移動する、（１）～（３）のいずれかに記載の金属管内面電解研磨方法。
（５）金属管内に電解液を循環させると共に、前記金属管内面と間隔を保ちながら電極を移動させる金属管内面電解研磨装置であって、
前記金属管を鉛直方向に立てる金属管移動機構、
前記金属管を鉛直方向に立てた後に、前記金属管の下端部および上端部に装着される閉鎖部材、および、
前記下端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内に流入させ、前記上端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内から排出させる電解液循環機構を備え、
前記閉鎖部材が下記ａ）～ｄ）の構造を有しており、前記金属管の両端部への前記閉鎖部材の装着が、前記閉鎖部材の開口部側を前記金属管の両端部の外側にはめ込んで行われる、前記金属管を鉛直方向に立てた状態で電解研磨を行う金属管内面電解研磨装置。
ａ）円筒形の側部およびこの側部の一端に底部、他端に開口部を有する
ｂ）前記底部の側には、前記金属管と同じ内径および外径を有するダミー管が内装されている
ｃ）前記開口部の内径は、前記金属管の外径と同じである
ｄ）前記底部には、前記電解液を通す貫通孔（電解液流入口または電解液排出口）が設けられている
（６）前記電極は、表面に樹脂製の接触防止ガイドを有しており、上端に接続された電極棒によって支持され、前記電極棒の出し入れによって、前記金属管の内側を上下方向に移動する、（５）に記載の金属管内面電解研磨装置。
（７）前記金属管を鉛直方向に立てた状態において、前記金属管の上端に装着される前記閉鎖部材の前記底部側には、装着前に前記電極が収納されている、（５）または（６）に記載の金属管内面電解研磨装置の使用方法。
（８）前記金属管の両端部に前記閉鎖部材を装着し、前記閉鎖部材を通して前記金属管内に前記電解液を循環させ、前記電極を、一旦、前記金属管の上端に装着された前記閉鎖部材から、前記金属管の下端に装着された前記閉鎖部材に移動させた後に、前記電極を上昇させながら電解研磨を行う、（５）または（６）に記載の金属管内面電解研磨装置の使用方法。 The gist of the present invention is shown below.
(1) A metal tube inner surface electrolytic polishing method in which an electrolytic solution is circulated in a metal tube and electrodes are moved while maintaining a distance from the metal tube inner surface.
Electropolishing is performed with the metal tube standing vertically.
After the metal pipe is erected in the vertical direction, a closing member is attached to the lower end and the upper end of the metal pipe.
The electrolytic solution is allowed to flow into the metal tube through the closing member attached to the lower end portion, and the electrolytic solution is discharged from the metal tube through the closing member attached to the upper end portion.
The closing member has the structures a) to d) below, and the attachment of the closing member to both ends of the metal tube causes the opening side of the closing member to be outside the both ends of the metal tube. An electrolytic polishing method for the inner surface of a metal tube, which is performed by fitting .
a) Cylindrical side and one end of this side has a bottom and the other end has an opening
b) A dummy tube having the same inner and outer diameters as the metal tube is installed on the bottom side.
c) The inner diameter of the opening is the same as the outer diameter of the metal tube.
d) The bottom is provided with a through hole (electrolyte liquid inlet or electrolyte liquid discharge port) through which the electrolytic solution is passed.
( 2 ) The electrode is housed on the bottom side of the closing member mounted on the upper end of the metal tube in a state where the metal tube is erected in the vertical direction before mounting. Metal tube inner surface electrolytic polishing method.
( 3 ) The closing member is attached to both ends of the metal tube, the electrolytic solution is circulated in the metal tube through the closing member, and the electrode is once attached to the upper end of the metal tube. The method according to (1) or (2) , wherein electrolytic polishing is performed while raising the electrode after moving the metal tube to the closing member mounted on the lower end of the metal tube.
( 4 ) The electrode has a contact prevention guide made of resin on the surface, is supported by an electrode rod connected to the upper end, and moves up and down inside the metal tube by moving the electrode rod in and out. , (1) to ( 3 ), the metal tube inner surface electrolytic polishing method.
( 5 ) A metal tube inner surface electrolytic polishing device that circulates an electrolytic solution in a metal tube and moves an electrode while maintaining a distance from the metal tube inner surface.
A metal tube moving mechanism that stands the metal tube in the vertical direction,
A closing member attached to the lower end and the upper end of the metal pipe after the metal pipe is erected in the vertical direction, and
It is provided with an electrolytic solution circulation mechanism for flowing the electrolytic solution into the metal tube through the closing member mounted on the lower end portion and discharging the electrolytic solution from the metal tube through the closing member mounted on the upper end portion.
The closing member has the structures a) to d) below, and the attachment of the closing member to both ends of the metal tube causes the opening side of the closing member to be outside the both ends of the metal tube. A metal tube inner surface electrolytic polishing device that performs electrolytic polishing with the metal tube upright in a vertical direction, which is performed by fitting .
a) Cylindrical side and one end of this side has a bottom and the other end has an opening
b) A dummy tube having the same inner and outer diameters as the metal tube is installed on the bottom side.
c) The inner diameter of the opening is the same as the outer diameter of the metal tube.
d) The bottom is provided with a through hole (electrolyte liquid inlet or electrolyte liquid discharge port) through which the electrolytic solution is passed.
(6) The electrode has a contact prevention guide made of resin on the surface, is supported by an electrode rod connected to the upper end, and moves vertically inside the metal tube by moving the electrode rod in and out. , (5). The metal tube inner surface electrolytic polishing apparatus.
( 7 ) In a state where the metal tube is erected in the vertical direction, the electrode is housed on the bottom side of the closing member mounted on the upper end of the metal tube before mounting, (5) or ( 5 ) or ( 6 ) A method of using the metal tube inner surface electrolytic polishing apparatus.
( 8 ) The closing member is attached to both ends of the metal tube, the electrolytic solution is circulated in the metal tube through the closing member, and the electrode is once attached to the upper end of the metal tube. The method of using the metal tube inner surface electrolytic polishing apparatus according to (5) or (6) , wherein after moving to the closing member mounted on the lower end of the metal tube, electrolytic polishing is performed while raising the electrode. ..

本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法では、金属管内面の電解研磨を、金属管を鉛直方向に立てた状態で行うことにより、通常の長い金属管の電解研磨においても、発生ガスを、発生ガスの浮力、および、金属管の下端部から流入し上端部から排出される電解液により、電解研磨が行われる箇所から除去でき、電解研磨を均一かつ良好に行うことができる。 In the method of electrolytic polishing the inner surface of a metal tube, the method of using the electrolytic polishing device for the inner surface of a metal tube and the electrolytic polishing device for the inner surface of a metal tube of the present invention, the electrolytic polishing of the inner surface of the metal tube is performed by performing the electrolytic polishing of the inner surface of the metal tube in a vertical direction. Even in ordinary electrolytic polishing of a long metal tube, the generated gas can be removed from the place where electrolytic polishing is performed by the buoyancy of the generated gas and the electrolytic solution that flows in from the lower end of the metal tube and is discharged from the upper end. Electrolytic polishing can be performed uniformly and satisfactorily.

さらに、金属管を鉛直方向に立てた後に、金属管の下端部および上端部に閉鎖部材を装着して金属管内に電解液を循環させるため、高さの高い電解槽や多量の電解液を必要とせず、電解研磨を経済的・効率的に行うことができる。 Furthermore, after the metal pipe is erected in the vertical direction, a closing member is attached to the lower end and the upper end of the metal pipe to circulate the electrolyte in the metal pipe, so a tall electrolytic cell and a large amount of electrolyte are required. Electrolytic polishing can be performed economically and efficiently.

さらに、金属管を鉛直方向に立てた状態で、重力を利用して電解液の排出・回収を十分に行うことができ、電解液のロスが抑えられ経済的であり、また、電解液の外部への排出量を抑えられ環境にも優しい。 Furthermore, with the metal tube standing in the vertical direction, gravity can be used to sufficiently discharge and recover the electrolytic solution, which is economical because the loss of the electrolytic solution is suppressed, and the outside of the electrolytic solution. It is environmentally friendly as it can reduce the amount of emissions to.

本件発明の実施形態における、金属管を鉛直方向に立てた後に、金属管の両端部に閉鎖部材を装着した状態を示す縦断面図である。It is a vertical cross-sectional view which shows the state which the closing member was attached to both ends of the metal tube after the metal tube was erected in the vertical direction in the Embodiment of this invention. 上記［図１］の状態から、電極を、金属管の上端に装着された閉鎖部材から、金属管の下端に装着された閉鎖部材に移動させた状態を示す縦断面図である。It is a vertical sectional view which shows the state which the electrode was moved from the closing member attached to the upper end of a metal tube to the closing member attached to the lower end of a metal tube from the state of [FIG. 1] above. 従来技術を示す、特許文献１（特開昭６１－２３６４２６号公報）の［第１図］である。FIG. 1 is [Fig. 1] of Patent Document 1 (Japanese Patent Laid-Open No. 61-236426) showing the prior art. 従来技術を示す、特許文献２（特開平５－２７９９００号公報）の［図１］である。FIG. 1 is [Fig. 1] of Patent Document 2 (Japanese Unexamined Patent Publication No. 5-279900) showing the prior art. 従来技術を示す、特許文献３（特開平７－２６６１３４号公報）の［図４］である。[Fig. 4] of Patent Document 3 (Japanese Unexamined Patent Publication No. 7-266134) showing the prior art.

以下に、本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法の実施形態について、図面も参照しながら具体的に説明するが、これらにより本件発明が限定されるものではない。 Hereinafter, embodiments of the metal tube inner surface electrolytic polishing method , the metal tube inner surface electrolytic polishing device , and the method of using the metal tube inner surface electrolytic polishing device of the present invention will be specifically described with reference to the drawings. Is not limited.

＜電解研磨の一般的な説明＞
まず、［図３］を用いて、金属管内面の電解研磨の一般的な事項について説明する。 <General explanation of electrolytic polishing>
First, the general matters of electrolytic polishing of the inner surface of a metal tube will be described with reference to [FIG. 3].

金属管１１の内面の電解研磨は、金属管１１をプラス側、金属管１１内の電極１４をマイナス側にして電解液１５を介して直流電流を流し、金属管１１の内面を溶解させることで電解研磨が行われる。すなわち、金属管１１の内面に存在する凹凸部では、電流が流れやすい凸部では溶解が比較的急速に進み、電流が流れにくい凹部では溶解が比較的ゆっくりと進むため、金属管１１の内面が平滑化されることとなる。特に、金属管１１の素材がステンレス鋼である場合には、主要な成分である鉄（Ｆｅ）とクロム（Ｃｒ）が溶け出し、Ｃｒは酸素と結合し表面に新たな酸化皮膜（不動態被膜）を生成するため、金属管１１の内面に高い耐食性を付与できる。 Electrolytic polishing of the inner surface of the metal tube 11 is performed by melting the inner surface of the metal tube 11 by passing a DC current through the electrolytic solution 15 with the metal tube 11 on the positive side and the electrode 14 in the metal tube 11 on the negative side. Electrolytic polishing is performed. That is, in the uneven portion existing on the inner surface of the metal tube 11, the dissolution proceeds relatively rapidly in the convex portion where the current easily flows, and the dissolution proceeds relatively slowly in the concave portion where the current does not easily flow, so that the inner surface of the metal tube 11 is formed. It will be smoothed. In particular, when the material of the metal tube 11 is stainless steel, iron (Fe) and chromium (Cr), which are the main components, are dissolved out, Cr is combined with oxygen, and a new oxide film (passivation film) is formed on the surface. ) Is generated, so that high corrosion resistance can be imparted to the inner surface of the metal tube 11.

また、電極１４については、通常の長い金属管１１の内の電解研磨を同時に行うには大きな電力が必要となるため、通常は、電極１４の一部を通電部とし（［図３］では、支持体１２、１３の間が通電部となっている）、この通電部を移動させることにより、金属管１１の内面に順次電解研磨を行っていく。 Further, since a large amount of electric power is required for the electrode 14 to simultaneously perform electrolytic polishing in a normal long metal tube 11, a part of the electrode 14 is usually used as a current-carrying part (in [FIG. 3], the electrode 14 is a current-carrying part. The current-carrying part is between the supports 12 and 13), and by moving this current-carrying part, electrolytic polishing is sequentially performed on the inner surface of the metal tube 11.

また、電解液１５の循環については、金属管１１の一端から電解液１５を流入させ、他端から電解液１５を排出させることにより電解液１５を循環させ、金属管１１の内面に発生ガスが付着することを防止する。 Regarding the circulation of the electrolytic solution 15, the electrolytic solution 15 is circulated by flowing the electrolytic solution 15 from one end of the metal tube 11 and discharging the electrolytic solution 15 from the other end, and the generated gas is generated on the inner surface of the metal tube 11. Prevents adhesion.

＜本件発明の主要な特長＞
本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法の大きな特長は、金属管を鉛直方向に立てた状態で電解研磨を行うことにある。 <Main features of the present invention>
A major feature of the metal tube inner surface electrolytic polishing method , the metal tube inner surface electrolytic polishing device , and the method of using the metal tube inner surface electrolytic polishing device of the present invention is that electrolytic polishing is performed with the metal tube standing vertically.

［図１］は、本件発明の実施形態における、金属管１を鉛直方向に立てた後に、金属管１の両端部に閉鎖部材３を装着した状態を示している。 FIG. 1 shows a state in which the closing member 3 is attached to both ends of the metal tube 1 after the metal tube 1 is erected in the vertical direction in the embodiment of the present invention.

金属管１は水平方向に載置された状態から、金属管移動機構（図示せず）により、鉛直方向に立てられる。金属管移動機構としては公知の機構を用いることができるが、例えば、水平方向で金属管１を支持体に固定し、この支持体を端部に設けた回転軸を中心に９０°回転させることにより金属管を鉛直方向に立てる機構を用いることができる。 The metal tube 1 is erected in the vertical direction by a metal tube moving mechanism (not shown) from the state where it is placed in the horizontal direction. A known mechanism can be used as the metal tube moving mechanism. For example, the metal tube 1 is fixed to a support in the horizontal direction, and the support is rotated by 90 ° around a rotation axis provided at an end. Therefore, a mechanism for standing the metal pipe in the vertical direction can be used.

金属管１を鉛直方向に立てた後に、金属管１の下端部および上端部に閉鎖部材３が装着され、下端部に装着した閉鎖部材３を通して電解液を金属管１内に流入させ、上端部に装着した閉鎖部材３を通して電解液を金属管１内から排出させて、金属管１内に電解液を循環させる。 After the metal tube 1 is erected in the vertical direction, the closing member 3 is attached to the lower end and the upper end of the metal tube 1, and the electrolytic solution is allowed to flow into the metal tube 1 through the closing member 3 attached to the lower end to flow into the upper end. The electrolytic solution is discharged from the inside of the metal tube 1 through the closing member 3 mounted on the metal tube 1, and the electrolytic solution is circulated in the metal tube 1.

電解液の循環が安定し、金属管１の温度が適切な温度となった後に、金属管１をプラス側、金属管１内の電極２をマイナス側にして電解液を介して直流電流を流すと共に、金属管１の内面と間隔を保ちながら電極２を移動させることにより、金属管１の内面の電解研磨が行われる。 After the circulation of the electrolytic solution is stable and the temperature of the metal tube 1 becomes an appropriate temperature, a DC current is passed through the electrolytic solution with the metal tube 1 on the positive side and the electrode 2 in the metal tube 1 on the negative side. At the same time, by moving the electrode 2 while maintaining a distance from the inner surface of the metal tube 1, electrolytic polishing of the inner surface of the metal tube 1 is performed.

電解研磨を良好に行う観点から、金属管１内を循環させる電解液の温度は５０℃～６５℃が好ましく、電解液の流速は０．５ｍ／ｓｅｃ～１．０ｍ／ｓｅｃとするのが好ましい。また、直流電流の電流密度は８Ａ／ｄｍ^２～３０Ａ／ｄｍ^２とするのが好ましい。 From the viewpoint of good electrolytic polishing, the temperature of the electrolytic solution circulating in the metal tube 1 is preferably 50 ° C to 65 ° C, and the flow rate of the electrolytic solution is preferably 0.5 m / sec to 1.0 m / sec. .. Further, the current density of the direct current is preferably 8 A / dm ² to 30 A / dm ² .

このように、金属管１内面の電解研磨を、金属管１を鉛直方向に立てた状態で行うことにより、通常の長い金属管の電解研磨においても、発生ガスを、発生ガスの浮力、および、金属管１の下端部から流入させ上端部から排出させる電解液により、電解研磨が行われる箇所から除去でき、電解研磨を均一かつ良好に行うことができる。また、このように、発生ガスの除去に発生ガスの浮力を利用し電解液の流速を低く設定できるため、電解研磨を一層均一かつ良好に行うことができると共に電解研磨に要する動力費を低減できる。 In this way, by performing electrolytic polishing of the inner surface of the metal tube 1 in a state where the metal tube 1 is erected in the vertical direction, the generated gas can be generated by the buoyancy of the generated gas and the buoyancy of the generated gas even in the electrolytic polishing of a normal long metal tube. The electrolytic solution that flows in from the lower end of the metal tube 1 and is discharged from the upper end can be removed from the portion where the electrolytic polishing is performed, and the electrolytic polishing can be performed uniformly and satisfactorily. Further, since the flow velocity of the electrolytic solution can be set low by utilizing the buoyancy of the generated gas for removing the generated gas, the electrolytic polishing can be performed more uniformly and satisfactorily, and the power cost required for the electrolytic polishing can be reduced. ..

さらに、金属管１内面の電解研磨を、金属管１を鉛直方向に立てた状態で行うことにより、電極２と、金属管１の内面との間隔を一定に保持できるため、電解研磨をなお一層均一かつ良好に行うことができる。 Further, by performing the electrolytic polishing of the inner surface of the metal tube 1 in a state where the metal tube 1 is erected in the vertical direction, the distance between the electrode 2 and the inner surface of the metal tube 1 can be kept constant, so that the electrolytic polishing is further performed. It can be done uniformly and well.

さらに、金属管１を鉛直方向に立てた後に、金属管１の下端部および上端部に閉鎖部材３を装着して金属管内に電解液を循環させるため、高さの高い電解槽や多量の電解液を必要とせず、電解研磨を経済的・効率的に行うことができる。 Further, after the metal tube 1 is erected in the vertical direction, a closing member 3 is attached to the lower end and the upper end of the metal tube 1 to circulate the electrolytic solution in the metal tube, so that a tall electrolytic cell and a large amount of electrolysis are performed. Electrolytic polishing can be performed economically and efficiently without the need for liquid.

＜閉鎖部材の構造＞
金属管１の下端部および上端部に装着される閉鎖部材３の構造は、下記ａ）～ｄ）の構造を有することが好ましい。
ａ）円筒形の側部３－１およびこの側部３－１の一端に底部３－２、他端に開口部３－３を有する
ｂ）底部３－２の側には、金属管１と同じ内径および外径を有するダミー管３－４が内装されている
ｃ）開口部３－３の内径は、金属管１の外径と同じである
ｄ）底部３－２には、電解液を通す貫通孔（電解液流入口３－５または電解液排出口３－６）が設けられている
そして、上記ａ）～ｄ）の構造を有する閉鎖部材３の金属管１の両端部への装着は、閉鎖部材３の開口部３－３側を、金属管１の両端部の外側にはめ込んで行われる。 <Structure of closing member>
The structure of the closing member 3 attached to the lower end portion and the upper end portion of the metal tube 1 preferably has the structures a) to d) below.
a) Cylindrical side 3-1 and having a bottom 3-2 at one end and an opening 3-3 at the other end b) A metal tube 1 on the side of the bottom 3-2 A dummy tube 3-4 having the same inner diameter and outer diameter is incorporated. C) The inner diameter of the opening 3-3 is the same as the outer diameter of the metal tube 1. d) An electrolytic solution is placed in the bottom 3-2. A through hole (electrolytic solution inlet 3-5 or electrolytic solution discharge port 3-6) is provided to pass through, and the closing member 3 having the structure of a) to d) above is attached to both ends of the metal tube 1. Is performed by fitting the opening 3-3 side of the closing member 3 into the outside of both ends of the metal tube 1.

上記のように、金属管１の下端部および上端部に装着される閉鎖部材３の底部３－２の側に、金属管１と同じ内径および外径を有するダミー管３－４を内装することにより、金属管１の端部に至るまで電解研磨を均一かつ良好に行うことができる。ダミー管３－４の長さは、［図１］にも示すように、電極２の鉛直方向の長さよりも長くすることが好ましい。 As described above, a dummy pipe 3-4 having the same inner diameter and outer diameter as the metal pipe 1 is installed on the side of the bottom portion 3-2 of the closing member 3 attached to the lower end portion and the upper end portion of the metal pipe 1. Therefore, electrolytic polishing can be performed uniformly and satisfactorily up to the end of the metal tube 1. As shown in [FIG. 1], the length of the dummy tube 3-4 is preferably longer than the length of the electrode 2 in the vertical direction.

金属管１の下端部および上端部に装着される閉鎖部材３の底部３－２に、電解液を通す貫通孔（電解液流入口３－５または電解液排出口３－６）を設け、電解液流入口３－５を通して電解液を金属管１内に流入させ、電解液排出口３－６を通して電解液を金属管１内から排出することにより、金属管１内の電解研磨液の流れを層流にできるため、電解研磨を均一かつ良好に行うことができる。 The bottom 3-2 of the closing member 3 attached to the lower end and the upper end of the metal tube 1 is provided with a through hole (electrolytic solution inlet 3-5 or electrolytic solution discharge port 3-6) through which the electrolytic solution is passed, and electrolyzes. By allowing the electrolytic solution to flow into the metal tube 1 through the liquid flow inlet 3-5 and discharging the electrolytic solution from the metal tube 1 through the electrolytic solution discharge port 3-6, the flow of the electrolytic polishing solution in the metal tube 1 can be flowed. Since the layer flow can be formed, electrolytic polishing can be performed uniformly and satisfactorily.

＜電極の収納＞
［図１］にも示すように、金属管１の上端に装着される閉鎖部材３の底部３－２側には、装着前に電極２を収納しておくのが好ましい。これにより、電解研磨に使用する電極２を、簡単に金属管１内に導入することができる。 <Storing electrodes>
As shown in FIG. 1, it is preferable to store the electrode 2 on the bottom 3-2 side of the closing member 3 mounted on the upper end of the metal tube 1 before mounting. Thereby, the electrode 2 used for electrolytic polishing can be easily introduced into the metal tube 1.

＜電解研磨の工程＞
［図１］～［図２］に示す本件発明の実施形態では、次のような工程により電解研磨が行われる。 <Electropolishing process>
In the embodiment of the present invention shown in FIGS. 1 to 2, electrolytic polishing is performed by the following steps.

［工程１］
［図１］に示す、金属管１を鉛直方向に立てた後に、金属管１の両端部に閉鎖部材３を装着した状態から、電解液流入口３－５を通して電解液を金属管１内に流入させ、電解液排出口３－６を通して電解液を金属管１内から排出して、金属管１内に電解液を循環させる。 [Step 1]
After the metal tube 1 is erected in the vertical direction as shown in [FIG. 1], the electrolytic solution is introduced into the metal tube 1 through the electrolytic solution inlet 3-5 from the state where the closing members 3 are attached to both ends of the metal tube 1. The electrolytic solution is made to flow in, and the electrolytic solution is discharged from the inside of the metal tube 1 through the electrolytic solution discharge port 3-6, and the electrolytic solution is circulated in the metal tube 1.

電解液循環機構としては、［図３］に記載されているような公知の電解液循環機構を採用することができる。すなわち、電解液タンクに貯留された電解液を、ポンプを用いて電解液流入口３－５に供給し、また、電解液排出口３－６から排出された電解液は電解液タンクに戻される。 As the electrolytic solution circulation mechanism, a known electrolytic solution circulation mechanism as shown in [FIG. 3] can be adopted. That is, the electrolytic solution stored in the electrolytic solution tank is supplied to the electrolytic solution inlet 3-5 using a pump, and the electrolytic solution discharged from the electrolytic solution discharge port 3-6 is returned to the electrolytic solution tank. ..

金属管１内を循環させる電解液の温度としては５０℃～６５℃程度が好ましいが、上記電解液タンクにおいて電解液の温度を好ましい温度に調整する。上記電解液タンクにおける温度調整は、金属管１に流入する電解液の温度を温度センサーで測定し、この温度が設定された温度となるよう、フィードバック制御することが好ましい。 The temperature of the electrolytic solution circulating in the metal tube 1 is preferably about 50 ° C. to 65 ° C., but the temperature of the electrolytic solution is adjusted to a preferable temperature in the electrolytic solution tank. For the temperature adjustment in the electrolytic solution tank, it is preferable to measure the temperature of the electrolytic solution flowing into the metal tube 1 with a temperature sensor and perform feedback control so that this temperature becomes the set temperature.

また、金属管１内を循環させる電解液の流速としては、０．５ｍ／ｓｅｃ～１．０ｍ／ｓｅｃとするのが好ましいが、上記ポンプにより電解液の流速を好ましい流速に調整する。上記ポンプによる流速調整は、金属管１に流入する電解液の流速を流量計で測定し、この流速が設定された流速となるよう、フィードバック制御することが好ましい。 The flow rate of the electrolytic solution circulating in the metal tube 1 is preferably 0.5 m / sec to 1.0 m / sec, but the flow rate of the electrolytic solution is adjusted to a preferable flow rate by the above pump. In the flow velocity adjustment by the pump, it is preferable to measure the flow velocity of the electrolytic solution flowing into the metal tube 1 with a flow meter and perform feedback control so that this flow velocity becomes the set flow velocity.

［工程２］
［図１］に示すように、金属管１の上端に装着された閉鎖部材３の底部３－２側に収納された電極２を、［図２］に示すように、金属管１の下端に装着された閉鎖部材３の底部３－２側に移動させる。この電極２の下方への移動は、電極２の上端に接続され、電極２を支持している電極棒２－２を送り出すことにより行われる。 [Step 2]
As shown in [FIG. 1], the electrode 2 housed on the bottom 3-2 side of the closing member 3 mounted on the upper end of the metal tube 1 is placed at the lower end of the metal tube 1 as shown in [FIG. 2]. It is moved to the bottom 3-2 side of the mounted closing member 3. This downward movement of the electrode 2 is performed by sending out the electrode rod 2-2 which is connected to the upper end of the electrode 2 and supports the electrode 2.

この電極２の移動は、電極２を鉛直方向下方から上方に移動させながら電解研磨を行うために行われる。このように電極２を上方に移動させながら電解研磨を行うことにより、発生ガスを、金属管１の下端部から流入し上端部から排出される電解液により、除去しやすくできる。 This movement of the electrode 2 is performed to perform electrolytic polishing while moving the electrode 2 from the lower side to the upper side in the vertical direction. By performing electrolytic polishing while moving the electrode 2 upward in this way, the generated gas can be easily removed by the electrolytic solution that flows in from the lower end portion of the metal tube 1 and is discharged from the upper end portion.

［工程３］
電解液の循環が十分に行われ、金属管１の温度が電解研磨を行うに十分な温度に均一に加温された段階で、電極２を鉛直方向下方から上方に移動させながら電解研磨を行う。この電極２の上方への移動は、電極２の上端に接続され、電極２を支持している電極棒２－２を引き込むことにより行われる。 [Step 3]
When the electrolytic solution is sufficiently circulated and the temperature of the metal tube 1 is uniformly heated to a temperature sufficient for electrolytic polishing, electrolytic polishing is performed while moving the electrode 2 from the lower side to the upper side in the vertical direction. .. This upward movement of the electrode 2 is performed by pulling in the electrode rod 2-2 which is connected to the upper end of the electrode 2 and supports the electrode 2.

金属管１内面の電解研磨を、金属管１を鉛直方向に立てた状態で行うことにより、基本的には、電極２と金属管１の内面と間隔を一定に保持できるが、安全対策も兼ねて、電極２の表面に樹脂製の接触防止ガイド２－１を設けることが好ましい。接触防止ガイド２－１の材質としては、絶縁性および電解液への耐食性を有する各種樹脂を使用できるが、これらの性質に優れるテフロン（登録商標）を好適に用いることができる。 By performing electrolytic polishing of the inner surface of the metal tube 1 with the metal tube 1 standing vertically, basically, the distance between the electrode 2 and the inner surface of the metal tube 1 can be kept constant, but it also serves as a safety measure. Therefore, it is preferable to provide a resin contact prevention guide 2-1 on the surface of the electrode 2. As the material of the contact prevention guide 2-1 various resins having insulating property and corrosion resistance to the electrolytic solution can be used, and Teflon (registered trademark) having excellent these properties can be preferably used.

［工程４］
電極２を鉛直方向下方から上方に移動させながら電解研磨を行い、電極２が［図１］に示すような、金属管１の上端に装着される閉鎖部材３の底部３－２側に戻った段階で電解研磨は完了し、その後、電解液の排出・回収および金属管１の内面の洗浄を行い、金属管１を金属管移動機構（図示せず）により、水平方向に戻す。 [Step 4]
Electrolytic polishing was performed while moving the electrode 2 from the lower side to the upper side in the vertical direction, and the electrode 2 returned to the bottom 3-2 side of the closing member 3 mounted on the upper end of the metal tube 1 as shown in [FIG. 1]. Electrolytic polishing is completed at this stage, and then the electrolytic solution is discharged / recovered and the inner surface of the metal tube 1 is cleaned, and the metal tube 1 is returned to the horizontal direction by a metal tube moving mechanism (not shown).

本件発明では、金属管１を鉛直方向に立てていることから、重力を利用して電解液の排出・回収を十分に行うことができ、電解液のロスが抑えられ経済的であり、また、電解液の外部への排出量を抑えられ環境にも優しい。 In the present invention, since the metal tube 1 is erected in the vertical direction, the electrolytic solution can be sufficiently discharged and recovered by using gravity, the loss of the electrolytic solution is suppressed, and it is economical. The amount of electrolyte discharged to the outside can be suppressed and it is environmentally friendly.

＜その他＞
金属管１の材質としては各種金属を用いることができるが、金属管１の材質がステンレス鋼である場合には、金属管１の内面にクロム（Ｃｒ）成分の含有率が高い酸化皮膜(不動態被膜)を生成でき、高い耐食性を付与できるため好ましい。 <Others>
Various metals can be used as the material of the metal tube 1, but when the material of the metal tube 1 is stainless steel, an oxide film having a high content of chromium (Cr) component on the inner surface of the metal tube 1 (non-existence). It is preferable because it can form a dynamic film) and can impart high corrosion resistance.

＜まとめ＞
上記のように、本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法は、金属管内面の電解研磨を、金属管を鉛直方向に立てた状態で行うことにより、通常の長い金属管の電解研磨においても、発生ガスを、発生ガスの浮力、および、金属管の下端部から流入し上端部から排出される電解液により、電解研磨が行われる箇所から除去でき、電解研磨を均一かつ良好に行うことができる優れたものである。 <Summary>
As described above, the method of using the metal tube inner surface electrolytic polishing method , the metal tube inner surface electrolytic polishing device , and the metal tube inner surface electrolytic polishing device of the present invention is a state in which the metal tube inner surface is electrolytically polished in a vertical direction. By doing this, even in the electrolytic polishing of a normal long metal tube, the generated gas is electrolytically polished by the buoyancy of the generated gas and the electrolytic solution that flows in from the lower end of the metal tube and is discharged from the upper end. It is an excellent product that can be removed from the spots and that electropolishing can be performed uniformly and satisfactorily.

さらに、本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法は、金属管を鉛直方向に立てた後に、金属管の下端部および上端部に閉鎖部材を装着して金属管内に電解液を循環させるため、高さの高い電解槽や多量の電解液を必要とせず、電解研磨を経済的・効率的に行うことができる優れたものである。 Further, the method of using the metal tube inner surface electropolishing method , the metal tube inner surface electropolishing device and the metal tube inner surface electropolishing device of the present invention is closed at the lower end and the upper end of the metal tube after the metal tube is erected in the vertical direction. Since the electrolytic solution is circulated in the metal tube by mounting the member, it does not require a tall electrolytic cell or a large amount of electrolytic solution, and is excellent in that electrolytic polishing can be performed economically and efficiently.

さらに、本件発明の金属管内面電解研磨方法、金属管内面電解研磨装置および金属管内面電解研磨装置の使用方法は、金属管を鉛直方向に立てた状態で、重力を利用して電解液の排出・回収を十分に行うことができ、電解液のロスが抑えられ経済的であり、また、電解液の外部への排出量を抑えられ環境にも優しい。 Further, in the method of using the metal tube inner surface electrolytic polishing method , the metal tube inner surface electrolytic polishing device and the metal tube inner surface electrolytic polishing device of the present invention, the electrolytic solution is discharged by utilizing gravity with the metal tube standing vertically. -Sufficient recovery can be performed, loss of electrolytic solution can be suppressed, which is economical, and the amount of electrolytic solution discharged to the outside can be suppressed, which is environmentally friendly.

１金属管
２電極
２－１接触防止ガイド
２－２電極棒
３閉鎖部材
３－１側部
３－２底部
３－３開口部
３－４ダミー管
３－５電解液流入口（貫通孔）
３－６電解液排出口（貫通孔）
１１金属管
１２、１３支持体
１４電極
１５電解液
２１金属管
２２電極管
２３絶縁隔壁
２４接続用ホース
２５電解研磨液供給孔
３１電解槽
３２金属管 1 Metal tube 2 Electrode 2-1 Contact prevention guide 2-2 Electrode rod 3 Closing member 3-1 Side 3-2 Bottom 3-3 Opening 3-4 Dummy tube 3-5 Electrolyte inlet (through hole)
3-6 Electrolyte discharge port (through hole)
11 Metal pipe 12, 13 Support 14 Electrode 15 Electrolyte 21 Metal pipe 22 Electrode pipe 23 Insulated partition wall 24 Connection hose 25 Electrolytic polishing liquid supply hole 31 Electrolytic cell 32 Metal pipe

Claims

金属管内に電解液を循環させると共に、前記金属管内面と間隔を保ちながら電極を移動させる金属管内面電解研磨方法であって、
前記金属管を鉛直方向に立てた状態で電解研磨が行われ、
前記金属管を鉛直方向に立てた後に、前記金属管の下端部および上端部に閉鎖部材を装着し、
前記下端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内に流入させ、前記上端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内から排出させ、
前記閉鎖部材が下記ａ）～ｄ）の構造を有しており、前記金属管の両端部への前記閉鎖部材の装着が、前記閉鎖部材の開口部側を前記金属管の両端部の外側にはめ込んで行われる、金属管内面電解研磨方法。
ａ）円筒形の側部およびこの側部の一端に底部、他端に開口部を有する
ｂ）前記底部の側には、前記金属管と同じ内径および外径を有するダミー管が内装されている
ｃ）前記開口部の内径は、前記金属管の外径と同じである
ｄ）前記底部には、前記電解液を通す貫通孔（電解液流入口または電解液排出口）が設けられている It is a metal tube inner surface electrolytic polishing method in which an electrolytic solution is circulated in a metal tube and an electrode is moved while maintaining a distance from the metal tube inner surface.
Electropolishing is performed with the metal tube standing vertically.
After the metal pipe is erected in the vertical direction, a closing member is attached to the lower end and the upper end of the metal pipe.
The electrolytic solution is allowed to flow into the metal tube through the closing member attached to the lower end portion, and the electrolytic solution is discharged from the metal tube through the closing member attached to the upper end portion.
The closing member has the structures a) to d) below, and the attachment of the closing member to both ends of the metal tube causes the opening side of the closing member to be outside the both ends of the metal tube. An electrolytic polishing method for the inner surface of a metal tube, which is performed by fitting .
a) Cylindrical side and one end of this side has a bottom and the other end has an opening
b) A dummy tube having the same inner and outer diameters as the metal tube is installed on the bottom side.
c) The inner diameter of the opening is the same as the outer diameter of the metal tube.
d) The bottom thereof is provided with a through hole (electrolyte liquid inlet or electrolyte liquid discharge port) through which the electrolytic solution is passed.

前記金属管を鉛直方向に立てた状態において、前記金属管の上端に装着される前記閉鎖部材の前記底部側には、装着前に前記電極が収納されている、請求項１に記載の金属管内面電解研磨方法。 The inside of the metal tube according to claim 1 , wherein the electrode is housed on the bottom side of the closing member mounted on the upper end of the metal tube in a state where the metal tube is erected in the vertical direction. Surface electropolishing method.

前記金属管の両端部に前記閉鎖部材を装着し、前記閉鎖部材を通して前記金属管内に前記電解液を循環させ、前記電極を、一旦、前記金属管の上端に装着された前記閉鎖部材から、前記金属管の下端に装着された前記閉鎖部材に移動させた後に、前記電極を上昇させながら電解研磨を行う、請求項１または２に記載の金属管内面電解研磨方法。 The closing member is attached to both ends of the metal tube, the electrolytic solution is circulated in the metal tube through the closing member, and the electrode is once mounted from the closing member attached to the upper end of the metal tube. The method for electrolyzing the inner surface of a metal tube according to claim 1 or 2 , wherein after moving to the closing member mounted on the lower end of the metal tube, electrolytic polishing is performed while raising the electrode.

前記電極は、表面に樹脂製の接触防止ガイドを有しており、上端に接続された電極棒によって支持され、前記電極棒の出し入れによって、前記金属管の内側を上下方向に移動する、請求項１～３のいずれかに記載の金属管内面電解研磨方法。 The electrode has a contact prevention guide made of resin on the surface, is supported by an electrode rod connected to the upper end, and moves up and down inside the metal tube by moving the electrode rod in and out. The method for electrolytic polishing the inner surface of a metal tube according to any one of 1 to 3 .

金属管内に電解液を循環させると共に、前記金属管内面と間隔を保ちながら電極を移動させる金属管内面電解研磨装置であって、
前記金属管を鉛直方向に立てる金属管移動機構、
前記金属管を鉛直方向に立てた後に、前記金属管の下端部および上端部に装着される閉鎖部材、および、
前記下端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内に流入させ、前記上端部に装着した前記閉鎖部材を通して前記電解液を前記金属管内から排出させる電解液循環機構を備え、
前記閉鎖部材が下記ａ）～ｄ）の構造を有しており、前記金属管の両端部への前記閉鎖部材の装着が、前記閉鎖部材の開口部側を前記金属管の両端部の外側にはめ込んで行われる、前記金属管を鉛直方向に立てた状態で電解研磨を行う金属管内面電解研磨装置。
ａ）円筒形の側部およびこの側部の一端に底部、他端に開口部を有する
ｂ）前記底部の側には、前記金属管と同じ内径および外径を有するダミー管が内装されている
ｃ）前記開口部の内径は、前記金属管の外径と同じである
ｄ）前記底部には、前記電解液を通す貫通孔（電解液流入口または電解液排出口）が設けられている A metal tube inner surface electrolytic polishing device that circulates an electrolytic solution in a metal tube and moves an electrode while maintaining a distance from the metal tube inner surface.
A metal tube moving mechanism that stands the metal tube in the vertical direction,
A closing member attached to the lower end and the upper end of the metal pipe after the metal pipe is erected in the vertical direction, and
It is provided with an electrolytic solution circulation mechanism for flowing the electrolytic solution into the metal tube through the closing member mounted on the lower end portion and discharging the electrolytic solution from the metal tube through the closing member mounted on the upper end portion.
The closing member has the structures a) to d) below, and the attachment of the closing member to both ends of the metal tube causes the opening side of the closing member to be outside the both ends of the metal tube. A metal tube inner surface electrolytic polishing device that performs electrolytic polishing with the metal tube upright in a vertical direction, which is performed by fitting .
a) Cylindrical side and one end of this side has a bottom and the other end has an opening
b) A dummy tube having the same inner and outer diameters as the metal tube is installed on the bottom side.
c) The inner diameter of the opening is the same as the outer diameter of the metal tube.
d) The bottom thereof is provided with a through hole (electrolyte liquid inlet or electrolyte liquid discharge port) through which the electrolytic solution is passed.

前記電極は、表面に樹脂製の接触防止ガイドを有しており、上端に接続された電極棒によって支持され、前記電極棒の出し入れによって、前記金属管の内側を上下方向に移動する、請求項５に記載の金属管内面電解研磨装置。The electrode has a contact prevention guide made of resin on the surface, is supported by an electrode rod connected to the upper end, and moves up and down inside the metal tube by moving the electrode rod in and out. 5. The metal tube inner surface electrolytic polishing apparatus according to 5.

前記金属管を鉛直方向に立てた状態において、前記金属管の上端に装着される前記閉鎖部材の前記底部側には、装着前に前記電極が収納されている、請求項５または６に記載の金属管内面電解研磨装置の使用方法。 The fifth or sixth aspect of claim 5 or 6 , wherein the electrode is housed on the bottom side of the closing member mounted on the upper end of the metal tube in a state where the metal tube is erected in the vertical direction. How to use the metal tube inner surface electrolytic polishing device.

前記金属管の両端部に前記閉鎖部材を装着し、前記閉鎖部材を通して前記金属管内に前記電解液を循環させ、前記電極を、一旦、前記金属管の上端に装着された前記閉鎖部材から、前記金属管の下端に装着された前記閉鎖部材に移動させた後に、前記電極を上昇させながら電解研磨を行う、請求項５または６に記載の金属管内面電解研磨装置の使用方法。 The closing member is attached to both ends of the metal tube, the electrolytic solution is circulated in the metal tube through the closing member, and the electrode is once mounted from the closing member attached to the upper end of the metal tube. The method of using the metal tube inner surface electrolytic polishing apparatus according to claim 5 or 6 , wherein after moving to the closing member mounted on the lower end of the metal tube, electrolytic polishing is performed while raising the electrode.