JP2011236500A - Auxiliary electrode for plating inner surface of long object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive auxiliary electrode for plating an inner surface of a long object which can be easily inserted in a bent filler pipe, and can suitably plate an inner surface of the filler pipe.SOLUTION: The auxiliary electrode 10 is used by being inserted in an inside of the filler pipe 20 in electroplating the filler pipe 20. The auxiliary electrode 10 includes an auxiliary anode 11 formed of a linear flexible conductor, and an auxiliary electrode spacer 12. The auxiliary electrode spacer 12 is formed in a long shape and includes a nonconductive spherical or oval spherical spacer spherical part 13 and a flexible spacer connection part 14 for connecting a plurality of spacer spherical parts 13 in a string shape. A plurality of auxiliary electrode spacers 12 are wound around the auxiliary anode 11 at a density such that the auxiliary anode 11 is not in contact with the inner surface of the filler pipe 20 and the spacer spherical parts 13 do not overlap with each other.

Description

  The present invention relates to an auxiliary electrode for inner surface plating used for electroplating an inner surface of a tubular article. In particular, the present invention relates to an auxiliary electrode for inner surface plating that is used by being inserted into a tubular article in order to perform electroplating on the inner surface of a bent tubular object, such as a filler pipe of an automobile.

Conventionally, in order to perform electroplating on a metal article, an electrode and an object to be plated are immersed in a plating solution in a plating tank, and an electrode is used as an anode and an object to be plated is used as a cathode. The ionized metal inside was deposited on the object to be plated for plating.
However, the flow of electricity is poor on the inner surface side of the long tubular article, and the plating metal is not deposited on the inner surface of the tubular article.

  Therefore, as shown in FIG. 8, the auxiliary anode 110 is inserted into the hollow object 120 and the auxiliary anode 110 is covered with the spacer 111 so that the auxiliary anode 110 does not contact the object 120. There is something. The spacer 111 is provided with a large number of holes 112 so that the plating solution flows between the auxiliary anode 110 and the inner surface of the object 120 and current flows (see, for example, Patent Document 1).

  However, in this case, the object to be plated 120 is intended to be formed in a straight line, and the object to be plated 120 that is bent in a complicated manner and has protrusions or the like on the inner surface is formed in the hole 112 of the spacer 111 or the surrounding area. The auxiliary anode 110 and the spacer 111 could not be smoothly inserted and removed due to being caught by the protrusion.

  Further, as shown in FIGS. 9 and 10, an auxiliary anode 210 is inserted into a hollow object 220, the auxiliary anode 210 is covered with a plurality of cylinders 211, and the auxiliary anode 210 is an object to be plated. There is one that prevents contact with 220 (see, for example, Patent Document 2). The auxiliary anode 210 is flexible, and the auxiliary anode 210 is formed so that it can be bent by covering the auxiliary anode 210 with a large number of cylinders 211 without any gap and bending the multiple cylinders 211 with each other.

  As shown in FIG. 9, the cylindrical body 211 has four frame plates 214 and openings 212 between the frame plates 214 formed in the peripheral surface, and both ends of the cylindrical body 211 are formed with plate-shaped end portions 213. The frame plate 214 is held. Through the opening 212, the plating solution can come in and out so as to contact the auxiliary anode 210. A hole is formed at the center of the end 213, and the auxiliary anode 210 is inserted into the hole. The front end of the frame plate 214 is in contact with the inner surface of the hollow object to be plated 220, and the auxiliary anode 210 is held at the center position inside the object to be plated 220. The end portion 213 contacts the end portion 213 of the adjacent cylindrical body 211, and the cylindrical body 211 is attached to the auxiliary anode 210 so as to be able to bend with each other. Therefore, the auxiliary anode 210 corresponds to the bending of the workpiece 220. Can be bent.

  However, in this case, in order to reduce the contact area with the inner surface of the hollow object 220 and to improve the circulation of the plating solution in the vicinity of the auxiliary anode 210, the frame plate 214 is made thin. Therefore, the frame plate 214 is easily deformed. When the frame plate 214 is deformed, the position of the auxiliary anode 210 is shifted from a predetermined position inside the cylindrical body 211, and the degree of plating on the inner surface of the workpiece 220 varies.

  Further, since the tip portion of the frame plate 214 is formed with a thin wall, as shown in FIG. 10, when inserted into a filler pipe that is a bent object 220, the tip portion of the frame plate 214 is The wearable frame plate 214 powder floats in the plating solution and adheres to the plating surface of the object to be plated 220 or gets caught in the plating film, which may cause a problem in the surface state. .

  Further, when the inner surface of the bent object 220 has a protrusion, a gap may be formed between the cylinder 211 and the cylinder 211 located at the bent portion, and the protrusion may be caught in the gap. It takes time to insert or take out 210 from the object 220 to be plated.

Japanese Patent Laid-Open No. 2007-39779 Japanese Patent No. 3081558

  Therefore, it is an object of the present invention to provide an inexpensive auxiliary electrode for inner plating of a long object that can be easily inserted into a bent tubular article and can be favorably plated on the inner surface of the tubular article. To do.

The present invention of claim 1 for solving the above-described problems is an auxiliary electrode used by being inserted into a tubular article for electroplating the inner surface of the tubular article when electroplating the tubular article. ,
The auxiliary electrode is composed of an auxiliary anode formed of a linear flexible conductor, and an auxiliary electrode spacer wound around the auxiliary anode.
The auxiliary electrode spacer is a non-conductive, spherical or oval spherical spacer spherical portion and a plurality of spacer spherical portions that are long from the flexible spacer coupling portion that connects the spacers in the longitudinal direction at intervals. The auxiliary electrode has a plurality of auxiliary electrode spacers wound around the auxiliary anode so that the spacer connecting portions overlap each other, and when the auxiliary electrode is inserted into the tubular article, An auxiliary electrode for inner plating of a long object, wherein the spacer spherical portions are wound at a density that does not overlap with each other without contacting the inner surface of the tubular article.

  In the first aspect of the present invention, since the auxiliary electrode is composed of an auxiliary anode formed of a linear flexible conductor and an auxiliary electrode spacer wound around the auxiliary anode, the tubular article having a bent portion Auxiliary electrode spacers can be placed along the inner surface of the tubular article to prevent the auxiliary anode from contacting the inner surface of the tubular article. Plating can be applied.

  Since the auxiliary electrode spacer has a non-conductive spherical or oval spherical spacer spherical portion, when the auxiliary electrode is inserted into the tubular article, the non-conductive spherical or oval spherical spacer spherical portion is the tubular article. The auxiliary anode is prevented from coming into contact with the inner surface of the tubular article, and the spherical or oval spherical surface easily slides against the inner surface of the tubular article, and the auxiliary electrode is inserted into the tubular article. The work of pulling out is easy.

  In addition, since the spacer spherical portion is spherical or elliptical spherical, there is no edge portion, and the spacer spherical portion does not come into contact with the inner surface of the tubular article and wear when the auxiliary electrode is inserted into the tubular article. The worn surface does not adhere to the plating surface of the spacer spherical portion, and the plating surface can be improved. Since the spacer spherical portion is spherical or elliptical spherical, the area where the spacer spherical portion contacts the inner surface of the tubular article is small, and the plating state of the inner surface of the tubular article can be made uniform. Since the spacer spherical portion is a sphere, it is not easily deformed even when it comes into contact with the inner surface of the tubular article, and the position of the auxiliary anode with respect to the inner surface of the tubular article does not change. be able to.

  The auxiliary electrode spacer is formed in a long shape from a flexible spacer connecting portion that connects a plurality of spacer spherical portions in a string shape continuously in the longitudinal direction at intervals. For this reason, even if the spacer spherical portion is not flexible, the entire auxiliary electrode spacer can be made flexible so that a long auxiliary electrode spacer can be wound around the outer periphery of the auxiliary anode. Can be held in a predetermined position.

  In the auxiliary electrode, a plurality of auxiliary electrode spacers are wound around the auxiliary anode so that the spacer connecting portions overlap each other. Therefore, the spacer connecting portions overlap each other in a mesh shape, and the spacer spherical portion moves over the overlap. Therefore, it is possible to prevent the auxiliary anode from coming into contact with the inner surface of the tubular article by holding the spacer spherical portions at a predetermined interval.

  When the auxiliary electrode is inserted into the tubular article, the auxiliary anode does not contact the inner surface of the tubular article, and the spacer spherical portions are wound at a density that does not overlap. For this reason, the spacer spherical portion protrudes outward, and a part of the outer shape of the auxiliary electrode does not protrude, maintaining the flexibility of the auxiliary electrode and facilitating insertion of the auxiliary electrode into the tubular article. The auxiliary anode can be prevented from contacting the inner surface of the tubular article.

  The present invention of claim 2 is an auxiliary electrode for inner plating of a long object in which the diameter of the spacer spherical portion is larger than twice the diameter of the spacer connecting portion.

  In the present invention of claim 2, since the diameter of the spacer spherical portion is larger than twice the diameter of the spacer connecting portion, the spacer connecting portions overlap each other when the auxiliary electrode spacer is wound around the auxiliary anode. The height of the spacer connecting part of the part is lower than the height of the spacer spherical part, the spacer connecting part does not contact or wear the inner surface of the tubular article, the plating state is excellent, and the spacer connecting part The durability of the part is not lowered, and the insertability of the auxiliary electrode is not impaired.

  In the third aspect of the present invention, the spacer spherical portion is formed of non-conductive synthetic resin or ceramic, and the spacer connecting portion is formed of non-conductive synthetic fiber or synthetic resin, and is formed at the center of the spacer spherical portion. This is an auxiliary electrode for inner plating of a long object in which a spacer connecting portion is inserted into the spacer spherical portion hole.

In the third aspect of the present invention, since the spacer spherical portion is formed of a non-conductive synthetic resin or ceramic, there is little friction even when contacting the inner surface of the tubular article, and the spacer spherical portion is immersed in a plating solution. However, it is less corroded and has excellent durability.
Since the spacer connecting portion is made of non-conductive synthetic fiber or synthetic resin, it is excellent in flexibility and easy to wrap around the auxiliary anode, and its strength is less likely to decrease even when immersed in the plating solution. Excellent durability.

  Since the spacer connecting portion is inserted into the spacer spherical portion hole formed in the central portion of the spacer spherical portion, when the auxiliary electrode spacer is wound around the auxiliary anode, the spacer connecting portions are overlapped and knitted in a mesh shape. However, the spacer spherical portion can move along the spacer connecting portion within this mesh range, and the spacer spherical portion moves when the auxiliary electrode is inserted into or pulled out from the tubular article having the bent portion. Therefore, an excessive force is not applied to the spacer spherical portion, and the insertion work is facilitated.

  The present invention of claim 4 is an auxiliary electrode for inner plating of a long object in which the spacer spherical portion and the spacer connecting portion are integrally formed of a non-conductive synthetic resin.

  In the present invention of claim 4, since the spacer spherical portion and the spacer connecting portion are integrally formed of a non-conductive synthetic resin, the spacer spherical portion and the spacer connecting portion can be manufactured in a single molding process, which is easy to manufacture and reduces costs. Can do.

  According to the present invention of claim 5, the auxiliary anode is an auxiliary electrode for inner plating of a long object formed by knitting a number of metal wires.

  In the present invention of claim 5, since the auxiliary anode is formed by knitting a number of metal wires, it is excellent in flexibility and strength, and is inserted from one end when the auxiliary electrode is inserted into the tubular article. It is easy to push it to the other end.

  The present invention of claim 6 is an auxiliary electrode for inner plating of a long object whose elliptical spacer spherical portion has an elliptical cross-sectional shape in the longitudinal direction or an arcuate shape at the tip.

  In the present invention of claim 6, since the elliptical spacer spherical portion has an elliptical cross-sectional shape in the longitudinal direction or a chevron shape in which the tip portion is arcuate, the portion that protrudes most in the radial direction is a smooth arc. The spherical or oval spherical surface is easy to slide with respect to the inner surface of the tubular article, and the operation of inserting and extracting the auxiliary electrode into the tubular article is easy. In addition, when the spacer spherical portion and the spacer connecting portion are integrally formed of a non-conductive synthetic resin, the connecting portion between the spacer spherical portion and the spacer connecting portion has no corners, and stress is concentrated even when bent. It has excellent durability because it never happens.

  Since the auxiliary electrode spacer has a non-conductive, spherical or oval spherical spacer spherical portion, the spacer spherical portion abuts against the inner surface of the tubular article and prevents the auxiliary anode from contacting the inner surface of the tubular article, The spherical or oval spherical surface is easy to slide with respect to the inner surface of the tubular article, and the operation of inserting the auxiliary electrode into the tubular article is easy.

The auxiliary electrode spacer is formed in a long shape from a flexible spacer connecting portion that connects a plurality of spacer spherical portions in a string shape continuously in the longitudinal direction at intervals, so that the entire auxiliary electrode spacer can be used. The spacer spherical portion can be held at a predetermined position by providing flexibility.
Since a plurality of auxiliary electrode spacers are wound around the auxiliary anode so that the spacer connecting portions overlap each other around the auxiliary anode, the spacer connecting portions overlap each other in a mesh pattern so that the spacer spherical portion does not greatly deviate. can do.

It is a conceptual diagram of the plating apparatus used by embodiment of this invention. It is a side view of the plating hanger used in embodiment of this invention. It is sectional drawing of the state which used the auxiliary electrode which is embodiment of this invention inside the tubular article. It is a partially expanded plan view of an auxiliary electrode according to an embodiment of the present invention. 1 is a partially enlarged plan view of an auxiliary electrode spacer of an auxiliary electrode according to a first embodiment of the present invention. It is a partially expanded plan view of the auxiliary electrode spacer of the auxiliary electrode according to the second embodiment of the present invention. It is a partially expanded plan view of the auxiliary electrode spacer of the auxiliary electrode according to the third embodiment of the present invention. It is sectional drawing which shows the use condition of the conventional auxiliary electrode. It is a perspective view of the cylinder used for the other conventional auxiliary electrode. It is sectional drawing which shows the use condition of the other conventional auxiliary electrode.

About embodiment of this invention, the case where zinc plating is carried out to the inner surface of the filler pipe 20 for motor vehicles which is a tubular article is taken for an example, About the auxiliary electrode 10 used for the plating, and plating based on FIGS. explain.
The auxiliary electrode 10 of the present invention can be widely used when plating the inner surface of a tubular article. It can also be used for plating other than zinc plating.

Tubular articles such as the filler pipe 20 are performed as shown in FIG.
A plating solution 2 is placed in the plating tank 1, and the plating solution 2 contains sodium hydroxide, sodium cyanide and zinc ions. Further, positive electrodes 3 and 4 formed of a zinc plate are inserted into the plating tank 1, and an auxiliary electrode 10 is inserted inside a filler pipe 20 that is an object to be plated. The auxiliary electrode 10 will be described later.
The surface of the filler pipe 20 is cleaned by a degreasing process and a cleaning process before the plating process.

  An anode lead wire 5 is attached to the positive electrodes 3 and 4, and an auxiliary anode lead wire 6 is attached to the auxiliary electrode 10. A cathode lead wire 7 is attached to the filler pipe 20. The anode lead wire 5 and the auxiliary anode lead wire 6 are connected to the anode of a plating current supply device (not shown), and the cathode lead wire 7 is connected to the cathode of the plating current supply device, and current is supplied from the supply device. Plating is performed.

At this time, a large number of filler pipes 20 are immersed in the plating tank 1 so as to be plated, and the holding of the filler pipe 20 in the plating tank 1 is performed as shown in FIG.
The filler pipe 20 is attached to the plating hanger 30 and immersed in the plating tank 1. The plating hanger 30 includes a cathode plate 31 and an anode plate 35, and the cathode plate 31 and the anode plate 35 are insulated and joined to each other near the center.

  The top end of the cathode plate 31 is bent into a substantially U-shaped cross section to form a cathode plate engaging portion 32. The cathode plate engaging portion 32 is engaged with the cathode bar 8 provided in the plating tank 1, and the plating hanger 30 and the filler pipe 20 are held in the plating tank 1. Cathode current is supplied to the cathode bar 8 from a supply device and is electrically connected to the cathode plate 31 of the plating hanger 30.

A cathode plate holding portion 33 is formed at the lower end of the cathode plate 31 to hold the filler pipe 20 that is a tubular article. The cathode plate holding unit 33 can hold the filler pipe 20 and supply a cathode current to the filler pipe 20 to electroplate the outer peripheral surface portion and the inner surface (filler pipe inner surface 21) of the filler pipe 20.
The filler pipe 20 may be held by being fitted into a cathode plate holding portion 33 formed in a ring shape having an opening, or may be hooked on a breather pipe or the like formed on the outer surface of the filler pipe 20.

  An upper end of the anode plate 35 forms an anode plate connection portion 36, and an anode current is supplied from the supply device via the anode plate connection portion 36. An anode plate end 37 is formed at the lower end of the anode plate 35, and an auxiliary electrode end 15 formed at the tip of an auxiliary electrode 10 described later is attached to the auxiliary electrode stopper 16 at the anode plate end 37. It is done. As a result, a positive current is supplied from the anode plate 35 to the auxiliary electrode 10.

Next, the auxiliary electrode 10 and the filler pipe 20 of the first embodiment will be described with reference to FIGS.
As shown in FIG. 3, the filler pipe 20 is provided with an injection part 22 for injecting fuel at the upper part of the inner surface 21 of the filler pipe, and two bent parts 23 are formed below along the shape of the car body of the automobile. ing. The number of the bent portions 23 varies depending on the shape of the automobile body. The injection portion 22 is formed with an injection overhang portion 24 projecting inside to hold a fuel injection gun (not shown), and an injection port 25 is formed at the center of the injection overhang portion 24.

As shown in FIG. 4, the auxiliary electrode 10 includes an auxiliary anode 11 formed of a linear flexible conductor, and an auxiliary electrode spacer 12 wound around the auxiliary anode 11.
The auxiliary anode 11 is formed by knitting a number of wires made of metal such as stainless steel. For this reason, it is excellent in flexibility and strength, and even when the auxiliary electrode 10 is inserted into the inside of the filler pipe 20 that is a tubular article, it is inserted from the injection portion 22 and even if there are a plurality of bent portions 23, the filler pipe According to the shape of 20, it is easy to push along the filler pipe inner surface 21 to the other outlet end. Further, the alkaline property of the plating solution 2 can be durable.

The auxiliary anode 11 can be used as long as it has flexibility and conductivity other than a large number of metallic wires.
As described above, the auxiliary anode end 15 is formed at the upper end of the auxiliary anode 11, and a through hole is formed in the auxiliary anode end 15, and the auxiliary anode stopper 16 is inserted into the through hole. And attached to the hole of the anode plate end portion 37 with a screw, a clip or the like.

The auxiliary electrode spacer 12 is a non-conductive, spherical or oval spherical spacer spherical portion 13 and a plurality of spacer spherical portions 13 which are connected to each other in a string shape continuously in the longitudinal direction at intervals. For this reason, even if the spacer spherical portion 13 does not have flexibility, the entire auxiliary electrode spacer 12 can be made flexible, and a long length is formed on the outer periphery of the auxiliary anode 11. A shaped auxiliary electrode spacer 12 can be wound. The auxiliary electrode spacer 12 can prevent the auxiliary anode 11 from coming into contact with the inner surface of the filler pipe 20 and reliably plate the inner surface of the filler pipe 20.

  The spacer spherical portion 13 of the auxiliary electrode spacer 12 is non-conductive and has a spherical shape or an elliptical spherical shape. In the first embodiment, as shown in FIG. When the auxiliary electrode 10 is inserted into the filler pipe 20, the spacer spherical portion 13 is in contact with the inner surface 21 of the filler pipe, even if there is a bent portion, so that the auxiliary anode 10 contacts the inner surface 21 of the filler pipe. 11 can be prevented from contacting the filler pipe inner surface 21. For this reason, the auxiliary electrode 10 can reliably electroplate the inner surface 21 of the filler pipe.

  Further, since the spacer spherical portion 13 is spherical or oval spherical, the surface thereof is smooth, and when the auxiliary electrode 10 is inserted into the filler pipe 20, there is little friction with respect to the filler pipe inner surface 21, and the spacer spherical portion 13 is slid. It is easy to move and the operation of inserting the auxiliary electrode 10 into the filler pipe 20 is easy.

Even when the injection overhanging portion 24 is inside the filler pipe 20, the spacer spherical portion 13 is not caught by the injection overhanging portion 24 when the auxiliary electrode 10 is inserted or pulled out. 10 workability of insertion and extraction is good.
Furthermore, since the spacer spherical portion 13 is spherical or oval spherical, there is no edge portion, and even when it contacts the filler pipe inner surface 21, it is not worn away and scraped, and the worn portion does not adhere to the plating surface. .

  Since the spacer spherical portion 13 is spherical or elliptical spherical, the area where the spacer spherical portion 13 contacts the filler pipe inner surface 21 is small, and the plating state of the filler pipe inner surface 21 can be made uniform. Furthermore, when the spacer spherical portion 13 having a high rigidity and not deformed is used, the position of the auxiliary anode 11 with respect to the filler pipe inner surface 21 does not change, so that the degree of plating of the filler pipe inner surface 21 can be made uniform. .

  The spacer spherical portion 13 is preferably formed of a non-conductive synthetic resin or ceramic. For example, polyacetal, polyethylene, polypropylene, nylon or the like can be used as the synthetic resin. Since synthetic resin or ceramic can be used, even if it contacts the filler pipe inner surface 21, there is little friction and excellent insertability, and even when immersed in the plating solution 2, there is little corrosion and excellent durability.

  As shown in FIG. 5, the spacer spherical portion 13 of the auxiliary electrode spacer 12 has a spacer spherical portion hole 17 formed at the center of the spacer spherical portion 13. A string-like spacer connecting portion 14 is inserted into the spacer spherical portion hole 17, and the spacer spherical portions 13 are connected in a string shape by the spacer connecting portion 14 continuously in the longitudinal direction at intervals.

  For this reason, even if the spacer spherical portion 13 does not have flexibility, the entire auxiliary electrode spacer 12 can be made flexible and the long auxiliary electrode spacer 12 can be wound around the outer periphery of the auxiliary anode 11. The spacer spherical portion 13 can be held at a predetermined position of the auxiliary anode 11. Further, as will be described later, the spacer spherical portion 13 can be displaced along the spacer connecting portion 14 within a predetermined range.

The spacer connecting portion 14 is formed of non-conductive synthetic fiber or synthetic resin. For example, nylon, polyester or the like can be used for the synthetic fiber, and polyethylene, polypropylene or the like can be used for the synthetic resin. For this reason, it is excellent in flexibility, the auxiliary electrode spacer 12 can be easily wound around the auxiliary anode 11, has a high tensile strength, and does not decrease in strength even when immersed in a plating solution, and has excellent durability. Yes.
As described above, since the spacer spherical portion 13 and the spacer connecting portion 14 can be made of different materials, the spacer spherical portion 13 has a high hardness, and a material that smoothly slides on the filler pipe inner surface 21 is used as the spacer. For the connecting portion 14, a material excellent in flexibility can be selected for each. Therefore, the auxiliary anode 11 excellent in slidability and flexibility can be obtained.

  As shown in FIG. 4, in the first embodiment in which a plurality of auxiliary electrode spacers 12 are wound around the outer periphery of the auxiliary anode 11 so that the spacer connecting portions 14 overlap each other, the two auxiliary electrodes 10 are meshed. The spacer connecting portions 14 overlap each other in a mesh shape.

When the auxiliary electrode spacer 12 is wound around the auxiliary anode 11, the spacer connecting portions 14 overlap each other in a mesh pattern, and the spacer spherical portion 13 does not move over the overlap, and the spacer spherical portion 13 does not deviate greatly. Can be. Therefore, the spacer spherical portion 13 can be held at a predetermined interval so that the auxiliary anode 11 does not contact the inner surface of the tubular article.
When the auxiliary electrode 10 is inserted into the filler pipe 20, even if the spacer spherical portion 13 comes into contact with the filler pipe inner surface 21, the spacer spherical portion 13 is held on the surface of the auxiliary anode 11 at a predetermined interval. It is possible to prevent the anode 11 from contacting the filler pipe inner surface 21.

  In order to wind the auxiliary electrode spacer 12 around the auxiliary anode 11, when the auxiliary electrode 10 is inserted into the filler pipe 20, the auxiliary anode 11 does not come into contact with the inner surface 21 of the filler pipe and the spacer spherical portions 13 are connected to each other. Are wound at a non-overlapping density. Thus, the spacer spherical portions 13 overlap each other, and the spacer spherical portion 13 protrudes in the radial direction of the auxiliary electrode 10 so that the overall outer diameter of the auxiliary electrode 10 is not increased, and the flexibility of the auxiliary electrode 10 is increased. The auxiliary electrode 10 can be easily inserted into the inner surface 21 of the filler pipe, and the auxiliary anode 11 can be prevented from contacting the inner surface 21 of the filler pipe.

  The diameter of the spacer spherical portion 13 is preferably larger than twice the diameter of the spacer connecting portion 14. In this case, when the auxiliary electrode spacer 12 is wound around the auxiliary anode 11, the spacer connecting portions 14 overlap each other, but the height of the overlapping portion of the spacer connecting portion 14 is lower than the height of the spacer spherical portion 13. Thus, the spacer connecting portion 14 does not wear due to contact with the inner surface of the filler pipe 20, the durability of the spacer connecting portion 14 is not lowered, and the insertability of the auxiliary electrode spacer 12 is not impaired.

  For example, the spacer spherical portion 13 has a diameter (A in FIG. 5) of about 6 to 7 mm, and the spacer connecting portion 14 has a thickness (B in FIG. 5) of about 2 to 3 mm in diameter. It is. The thickness of the auxiliary anode 11 is about 5 mm in diameter. Thereby, when the auxiliary electrode 10 in which the auxiliary electrode spacer 12 is wound around the auxiliary anode 11 is inserted into the filler pipe 20, the auxiliary anode 11 does not contact the filler pipe inner surface 21, and the spacer spherical portion 13 can contact. . Further, when the auxiliary anode 11 is inserted into the filler pipe 20, a sufficient gap can be provided between the filler pipe inner surface 21 and the auxiliary electrode 10.

Further, as shown in FIG. 6, in the second embodiment, the spacer spherical portion 13 and the spacer connecting portion 14 that are the auxiliary electrode spacers 12 can be integrally formed of a non-conductive synthetic resin. This non-conductive synthetic resin is flexible so that the auxiliary electrode spacer 12 can be attached to the auxiliary anode 11, and when the auxiliary electrode spacer 12 is inserted into the filler pipe 20, the spacer spherical portion 13 becomes a filler. It has a strength that allows the pipe inner surface 21 to slide easily. In this case, it can be formed by a single molding or extrusion molding, and the production is easy and the cost can be reduced.
The size of the spacer spherical portion 13 which is the auxiliary electrode spacer 12 is the same as that of the embodiment shown in FIG.

  As shown in FIG. 7, in the third embodiment, the longitudinal cross-sectional shape of the spacer spherical portion 13 that is the auxiliary electrode spacer 12 is an ellipse. This elliptical shape is similar to an elliptical shape and an elliptical shape. The most radially projecting tip portion is an arc shape and the skirt portion is substantially linear, and the continuous portion with the spacer connecting portion 14 is smoothly continuous. Is included. Further, similarly to the second embodiment, the spacer spherical portion 13 and the spacer connecting portion 14 which are the auxiliary electrode spacers 12 can be integrally formed of a non-conductive synthetic resin.

In the case where the elliptical spacer spherical portion 13 has an elliptical cross-sectional shape or an arc-shaped mountain shape at the tip, the most protruding portion is a smooth arc shape that is caught. There is no edge and the oval surface easily slides with respect to the inner surface of the tubular article 20, and the operation of inserting and extracting the auxiliary electrode 10 into the tubular article 20 is easy.
In addition, when the spacer spherical portion 13 and the spacer connecting portion 14 are integrally formed of a non-conductive synthetic resin, the connecting portion between the spacer spherical portion 13 and the spacer connecting portion 114 has no corners and is smoothly continuous. Since the surface can be formed and stress is not concentrated even if it is bent, it has excellent durability.

Further, similarly to the second embodiment, when formed of a non-conductive synthetic resin, the auxiliary electrode spacer 12 has flexibility capable of being wound around the auxiliary anode 11 and the spacer spherical portion 13. Has a strength capable of easily sliding on the inner surface 21 of the filler pipe. In this case, it can be formed by a single molding or extrusion molding, and the production is easy and the cost can be reduced.
Note that the size of the spacer spherical portion 13 (A in FIG. 7) and the thickness of the spacer connecting portion 14 (B in FIG. 7) are the same as those in the first embodiment shown in FIG. It is.

DESCRIPTION OF SYMBOLS 1 Plating tank 2 Plating solution 10 Auxiliary electrode 11 Auxiliary anode 12 Auxiliary electrode spacer 13 Spacer spherical part 14 Spacer connection part 20 Filler pipe (tubular article)
21 Filler pipe inner surface

Claims (6)

When an electroplating is performed on a tubular article, in the auxiliary electrode used by being inserted into the tubular article for electroplating the inner surface of the tubular article,
The auxiliary electrode includes an auxiliary anode formed of a linear flexible conductor, and an auxiliary electrode spacer wound around the auxiliary anode.
The auxiliary electrode spacer includes a non-conductive spherical or oval spherical spacer spherical portion, and a flexible spacer coupling portion that connects the plurality of spacer spherical portions in a string shape continuously in the longitudinal direction at intervals. Formed in a long shape,
The auxiliary electrode has a plurality of auxiliary electrode spacers wound around the auxiliary anode so that the spacer connecting portions overlap each other, and the auxiliary electrode is inserted when the auxiliary electrode is inserted into the tubular article. An auxiliary electrode for inner plating of a long object, wherein the anode is wound at a density that does not contact the inner surface of the tubular article and the spacer spherical portions do not overlap each other.   The auxiliary electrode for inner plating of a long object according to claim 1, wherein a diameter of the spacer spherical portion is larger than twice a diameter of the spacer connecting portion.   The spacer spherical portion is formed of a non-conductive synthetic resin or ceramic, and the spacer coupling portion is formed of a non-conductive synthetic fiber or synthetic resin, and is formed at the center of the spacer spherical portion. The auxiliary electrode for inner plating of a long object according to claim 1 or 2, wherein the spacer connecting portion is inserted into a hole, and the spacer spherical portions are connected at intervals.   The auxiliary electrode for inner plating of a long object according to claim 1 or 2, wherein the spacer spherical portion and the spacer connecting portion are integrally formed of a non-conductive synthetic resin. The auxiliary electrode for inner plating of a long object according to any one of claims 1 to 4, wherein the auxiliary anode is formed by braiding a number of metal wires.   The inner surface of the elongated object according to any one of claims 1 to 4, wherein the elliptical spacer spherical portion has an elliptical cross-sectional shape in a longitudinal direction, or an arcuate shape at a tip portion. Auxiliary electrode for plating.

Images