JP2002266092A - Manufacturing method by electroforming of various kinds of gold pipes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly improve the durability of durable materials, such as springs, and fundamentally solve the problems of the burn of resin portions of electroforming tools and the breakage of wires caused by the heat generated in a method for manufacturing the bold pipes by using one or plural pieces of columnar bodies of metallic and plastic, wires, or the like, as matrices and removing the columnar bodies after electroforming. SOLUTION: Means of using an auxiliary hook member 17 formed by using a fine disposal metallic rod, metallic pipe, or the like, having a good electro conducting characteristic near the liquid level of an electroforming liquid is adopted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferrule which is a component for an optical fiber connector, an optical device, or the like.
The present invention relates to a method for manufacturing various brass tubes such as sleeves.

[0002]

2. Description of the Related Art Conventionally, for example, a ferrule for an optical fiber connector has a shape as shown in FIGS. 1A and 1B, for example, and a material using zirconia ceramics is mainly used. FIG. 1A shows a ferrule 1 of a single core type having a cylindrical shape having a thickness of about 2 mm and a length of about 8 mm, and a true circular hole 2 of about 0.126 mm in the center.
Are perforated, and FIG. 1B shows a two-core type.

[0003] On the other hand, the present inventor has disclosed in Japanese Patent Application No. 10-3753.
No.72 proposes a metal ferrule made of metal such as nickel by electroforming using one or more metal or plastic wires as a matrix, removing the wires and machining. are doing.

[0004] In this patent, for example, electroforming is carried out by a device as schematically shown in FIG. 2. To be more specific, in FIG. 2, the electroforming solution 3, the positive electrode 4, the holding jig 5, It is composed of an air stirring nozzle 6, a spring 7, a negative electrode 8, and a wire 9.

[0005] A positive electrode 4 in which nickel balls are put in a cylindrical titanium basket in a heated electroforming liquid 3 mainly containing nickel sulfamate or the like is arranged at four corners around a holding jig 5. A wire 9 is set around a holding jig 5 having a minus electrode 8 fixed in a state where the wire 9 is pulled by a spring 7. A way to do that has been proposed.

In this method, a stainless steel wire, an aluminum alloy wire, or the like is used as a wire material. However, as shown in FIG. Particularly in the case of a stainless wire or the like, since the electrical conductivity is not so good, when trying to flow a predetermined current value, the voltage is increased and heat is generated, and this heat falls into a vicious circle in which the resistance value is further increased, and Because the current value is gradually increased as the electroformed product becomes thicker, in the extreme case, the heat generated will burn the resin part of the electroforming jig during electroforming, or the line will be cut off In order to avoid this phenomenon, if the hook part such as a spring which is a durable member is put into the electroforming liquid 3 as shown in FIG. And can be used only once That problem there, also had a similar problem in a case of producing a similar manner a sleeve for an optical fiber connector.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above,
An object of the present invention is to solve problems such as burning of a resin portion of an electroforming jig due to heat generated in a wire during energization without durable members such as a spring portion being put in an electroforming liquid.

[0008]

In order to solve the above-mentioned problems, the present invention employs a means for using a disposable auxiliary hook member 17 having good electric conductivity as shown in FIG.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

The embodiment of the present invention will be described in more detail. In FIG. 2, the electroforming liquid 3 differs depending on the material of the target electroformed metal. For example, nickel or its alloy, iron or its alloy, copper Alternatively, an electroformed metal such as an alloy thereof, cobalt or an alloy thereof, a tungsten alloy, a fine particle-dispersed metal, or the like can be used. Body, copper sulfate, copper borofluoride,
An aqueous solution mainly containing an aqueous solution of copper silicon fluoride, copper copper fluoride, copper alkanol sulfonate, cobalt sulfate, sodium tungstate or the like, or silicon carbide, tungsten carbide, boron carbide, zirconium oxide, silicon nitride A liquid in which fine powders such as alumina, diamond and the like are dispersed is used. Among them, a bath containing nickel sulfamate as a main component is particularly suitable in terms of ease of electroforming, variety of physical properties such as hardness, chemical stability, ease of welding, and the like. Then, the electroforming liquid is subjected to high-speed filtration with a filter having a filtration accuracy of about 0.1 to 5 μm,
It is also desirable to control the temperature by heating to an appropriate temperature range of about ± 3 ° C., and to remove organic impurities by sometimes performing activated carbon treatment.

The positive electrode 4 differs depending on the intended electroformed metal, and is selected from nickel, iron, copper, cobalt and the like, and a plate-like or spherical one is appropriately used. When a spherical material is used, it may be put in a titanium basket and covered with a polyester cloth bag. Then, four positive electrodes are arranged around a cylindrical body 9a such as the wire rod 9 or the like.

The support jig 5 has, for example, a configuration as shown in FIG. 4, and is formed by fixing an upper plate 10 and a lower plate 11 with four columns 12 using screws. An electrically insulating material such as a polyvinyl chloride resin, a polyamide resin, a polyacetal resin, or a polyethylene resin is used.
Use metal or plastic such as stainless steel or titanium. The upper plate 10, the lower plate 11 and the column 12 are fixed with screws, and a stainless steel spring 7 is fixed to the center of the upper plate 10 with a stainless screw 13. A plastic clip 15 is fixed to the center of the lower plate 11 with screws, and circular holes 14 for air nozzles are formed in four places. After fixing the disposable auxiliary hook member 17 to the hook 16 of the spring 7, a cylindrical body 9 a such as a wire 9 is fixed to the lower part of the auxiliary hook member 17 and pulled to extend the spring 6 with the clip 15. The cylindrical body 9a such as the wire 9 may be straightened by being pinched and pulled, so that the liquid level 18 of the electroforming liquid comes near the center of the auxiliary hook member 17.

The auxiliary hook member 17 is suitably made of a thin metal rod having an appropriate strength that is not stretched or cut by being pulled by a spring having good electric conductivity. For example, using a metal tube 19 as shown in FIG. 5 (a), a wire 9 is inserted into the metal tube 19 as shown in FIG. A method in which the hook portion 21 is provided by fixing the cylindrical body 9a such as 9 so as not to move and then crushing and bending the metal tube 19 on the upper portion, and the material of the auxiliary hook member 17 is A material having good conductivity such as pure copper or a copper alloy without oxide is preferable. Also, by adopting this method, it is difficult to fix the columnar body 9a such as the wire 9 and the auxiliary hook member, which is conventionally troublesome. Functions can be shared.

The cylindrical body 9a such as the wire 9 is made of a metal wire such as iron or an alloy thereof, aluminum or an alloy thereof, copper or an alloy thereof, a tungsten alloy, a thin solder-plated metal wire, and nylon. , Plastic wire such as polyester, ceramic wire such as glass, etc. are appropriately selected and used, and plastic,
In the case of a ceramic wire, electroless plating of nickel, silver, or the like is required to impart conductivity to the surface. The cylindrical body 9a such as the wire rod 9 is required to have high accuracy in thickness, roundness and linearity, and may be adjusted by extrusion with a die, and an iron alloy such as SUS, which is an iron alloy, is particularly desirable.

The electroforming is carried out by the above-mentioned apparatus. In the electroforming, a direct current is carried out at a current density of about 4 to 10 A / dm ² and the rod is grown to a predetermined thickness in a rod shape. To
Initially, the current starts from a low current, gradually increases the current, and when the accumulated current amount reaches a predetermined deposition amount (thickness) for each holding jig 5, the current from the rectifier is automatically cut off. It is desirable to have a configuration.

The type of the cylindrical body 9a such as the wire 9 to be selected determines whether the cylindrical body 9a at the center of the electroformed product is pulled out, extruded, or dissolved by a chemical. Those that are difficult to perform and have high tensile strength use pull-out or extrusion, and those that are easily dissolved in chemicals use dissolution.

In the case of mechanical processing, in the case of drawing, after the cylindrical body 9a is drawn, finishing processing may be performed by centerless processing or the like. In the case of melting, after electroforming with a single rod, cutting into an approximate length, melting the cylindrical body 9a, and after confirming that the hole has penetrated, finishing or finishing. A method of removing the cylindrical body 9a after processing into a finished product may be adopted.

[0018]

According to the method of the present invention, the means for using the disposable auxiliary hook member 17 having good electric conductivity at the liquid level of the electroforming liquid is employed, so that the spring portion is provided in the electroforming liquid. Since it is not inserted, the durability of durable materials such as springs can be significantly improved, and the heat generated by faulty wire conduction can cause the resin part of the electroforming jig to burn or the wire material to break. The problem can be solved fundamentally, and the function of fixing the columnar body 9a such as the wire rod 9 and the function as an auxiliary hook member, which is troublesome by adopting the metal thin tube 19, can be used.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view and a side view of a ferrule according to a conventional method.

FIG. 2 is a schematic configuration diagram of an electroforming apparatus according to a conventional method.

FIG. 3 is a side view of a holding jig showing a position of a liquid level of an electroforming liquid of an electroforming apparatus according to a conventional method.

FIG. 4 is a side view and a plan view of a holding jig showing one embodiment of the electroforming apparatus according to the present invention.

FIG. 5 is an enlarged side sectional view showing one embodiment when a metal tube 19 according to the present invention is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ferrule 2 True circular hole 3 Electroforming liquid 4 Positive electrode 5 Holding jig 6 Air stirring nozzle 7 Spring 8 Negative electrode 9 Wire 9a Cylindrical body 10 Upper plate 11 Lower plate 12 Column 13 Stainless screw 14 Circular hole 15 Clip 16 Hook Part 17 Auxiliary hook member 18 Liquid level 19 Metal tube 20 Caulking part 21 Hook part

Claims (3)

[Claims] 1. One or a plurality of cylindrical bodies 9a such as wires 9 such as metal or plastic are used for a matrix.
In the method of manufacturing various brass tubes for removing the cylindrical body 9a after electroforming, the disposable auxiliary hook member 1 having good electrical conductivity is provided.
7. A manufacturing method, wherein 7 is used at a liquid surface position of an electroforming liquid. 2. The method according to claim 1, wherein a thin metal rod is used for said auxiliary hook member. 3. A metal tube 19 is used for the auxiliary hook member 17, a cylindrical member 9a is inserted into a hole of the metal tube 19, and the cylindrical member 9a such as the wire 9 is fixed by caulking. A method for manufacturing various brass tubes according to claim 1.