JP3813531B2 - Manufacturing method of various types of gold pipes by electroforming - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing various types of gold pipes such as ferrules and sleeves that are parts for optical fiber connectors and optical devices, for example.
[0002]
[Prior art]
Conventionally, for example, in the case of a ferrule for an optical fiber connector, the shape is as shown in FIGS. 1A and 1B, for example, and zirconia ceramics is mainly used as the material. FIG. 1 (a) is a single-core type ferrule 1, which is a cylindrical shape having a thickness of about 2.5 mmφ and a length of about 10.5 mm, and a round hole 2 having a center of about 0.125 mmφ is drilled in the center. FIG. 1B shows a two-core type.
[0003]
On the other hand, the present inventor in Japanese Patent Application No. 10-375372 uses a method in which one or a plurality of metal or plastic wire rods are electroformed using a mother die, and the wire rods are removed and then machined. Proposes ferrules made of metal such as nickel.
[0004]
In this patent, for example, electroforming is carried out with a schematic apparatus as shown in FIG. 2, for example. In FIG. 2, the electroforming liquid 3, the positive electrode 4, the holding jig 5, the air stirring nozzle 6, a spring 7, a negative electrode 8, and a wire 9.
[0005]
A positive electrode 4 in which nickel spheres are placed in a cylindrical titanium basket in an electroforming solution 3 mainly composed of heated nickel sulfamate is arranged at four corners with a holding jig 5 as a center, and a wire rod There is a method of electroforming by setting a holding jig 5 having a negative electrode 8 fixed in a state where 9 is pulled by a spring 7 and flowing a direct current while stirring by blowing a small amount of air from an air stirring nozzle 6. Proposed.
[0006]
In this method, a stainless steel wire, an aluminum alloy wire, or the like is used as the wire. However, when the electroforming is performed above the liquid surface 18 of the electroforming liquid 3 as shown in FIG. In such a case, the electrical conductivity is not good, so when a predetermined current value is passed, the voltage becomes high and heat is generated, and this heat causes a vicious circle in which the resistance value further increases, and the electroformed product is In order to increase the current value gradually as it gets thicker, in extreme cases, the heat generated can cause a fatal problem that the resin part of the electroforming jig is burned or the wire is cut during electroforming. Yes, in order to avoid this phenomenon, for example, as shown in FIG. 3 (B), when the hook part such as a spring, which is a durable member, is inserted into the electroforming liquid 3, it is electroformed thickly and once attached to the hook part. There are also problems that can only be used, I had a similar problem in a case of producing a similar manner the sleeves for fiber connectors.
[0007]
As a means for solving this problem, in the Japanese Patent Application No. 2001-111992, the present inventor used a means for using a disposable auxiliary hook member 17 having good conductivity in the electroforming liquid surface portion as shown in FIG. Using a metal tube 19 as shown in FIG. 5 (a), as shown in FIG. 5 (b), the wire 9 is put into the metal tube 19 and a crimping portion 20 is provided to fix the wire 9 so as not to move. Then, by adopting a method in which the hook portion 21 is provided by crushing the metal tube 19 at the top and then bending it, it becomes possible to solve the above-mentioned problem, but the configuration of the support jig 5 shown in FIG. More specifically, the upper plate 10 and the lower plate 11 are fixed by screws with four columns 12, and the upper plate 10 and the lower plate 11 are made of polyvinyl chloride resin, polyamide resin, polyacetal resin, polyethylene resin. Such as Using the gas-insulating material, the struts 12 uses stainless steel, metal or plastic, such as titanium. The upper plate 10, the lower plate 11, and the support 12 are fixed with screws, and the stainless spring 7 is fixed with a stainless screw 13 in the center of the upper plate 10. A plastic clip 15 is fixed to the center of the lower plate 11 with screws, and circular holes 14 for air nozzles are drilled at four locations. After the disposable auxiliary hook member 17 is fixed to the hooking portion 16 of the spring 7, the wire 9 is fixed to the lower portion of the auxiliary hook member 17 and pulled to stretch the spring 6, but the clip 6 is sandwiched and pulled. The wire rod 9 is in a straight state so that the liquid level 18 of the electroforming liquid comes near the center of the auxiliary hook member 17, but these methods are troublesome in attaching the auxiliary hook member 17, Since the long metal tube 19 is required, there is a problem that the cost is increased and the effective electroforming length is shortened because the auxiliary hook member 17 and the metal tube 19 are used near the electroforming liquid surface.
[0008]
[Problems to be solved by the invention]
In view of the above, the present invention solves problems such as burning of the resin part of the electroforming jig without causing a durable use member such as a spring part into the electroforming liquid, and heat generated in the wire during energization, Further, it is a problem that it takes time to attach the auxiliary hook member 17, the cost of the metal tube 19 is increased, and the problem of a short effective electroforming length is solved.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention uses a wire holding part 22 having good conductivity as shown in FIG. 6 and fixes the wire 9 by caulking through the line holding part 22 or the like. Then, it is set on the holding jig 5 and the electroforming is started by applying a direct current, but at the initial stage, it is immersed in the liquid casting liquid surface 18 to the position of the wire holding component 22 for a short time. A method was employed in which a metal having conductivity such as nickel was electrolytically deposited for a while and then electroformed with the holding jig 5 raised to the position shown in FIG.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described in more detail. FIG. 6 shows an example of the wire holding component 22 according to the present invention. The wire 9 is attached to a metal tube using a conductive material such as copper or copper alloy. The wire 9 is fixed by caulking after being inserted, and the opposite side is bent to form the hook portion 21. However, the wire holding component 22 is not limited to such a metal tube, and is commercially available, for example. Various copper crimp terminals may be used.
[0011]
FIG. 7 shows an embodiment of the electroforming apparatus according to the present invention. The holding jig 5 in which the wire 9 is fixed by the wire holding component 22 is immersed in the electroforming liquid, and is negatively energized. The holding jig 5 is rotated by using a metal such as nickel as the positive electrode 4 and the electroforming is carried out. At this time, the holding jig 5 is configured to be movable up and down. Once the holding jig 5 is lowered to the position of the wire holding component 22 and immersed in the electroforming liquid, and left for several minutes to deposit a thin metal such as nickel having good conductivity on the surface of the wire 9, Electroforming may be performed after raising the holding jig 5 slightly to the position shown in FIG.
[0012]
The electroforming liquid 3 is different depending on the material of the target electroformed metal, for example, nickel or an alloy thereof, iron or an alloy thereof, copper or an alloy thereof, cobalt or an alloy thereof, a tungsten alloy, a fine particle dispersed metal, or the like. Cast metal can be used, nickel sulfamate, nickel chloride, nickel sulfate, ferrous sulfamate, ferrous borofluoride, pyrophosphoric acid barrel, copper sulfate, copper borofluoride, copper silicofluoride, copper copper fluoride, alkanol An aqueous solution mainly composed of an aqueous solution of copper sulfonate, cobalt sulfate, sodium tungstate, or the like is used, and among these, a bath mainly composed of nickel sulfamate is a physical property such as ease of electroforming and hardness. It is suitable in terms of diversity, chemical stability and ease of welding. The electroforming solution is filtered at a high speed with a filter having a filtration accuracy of about 0.1 to 5 μm, and heated to control the temperature within an appropriate temperature range of about ± 2 ° C.
[0013]
Electroforming is carried out with the apparatus as described above. In electroforming, direct current is applied at a current density of about 4 to 10 A / dm ² and grown to a predetermined thickness in a rod shape. Specifically, it starts with a low current, gradually increases the current, and automatically reaches the integrated current amount that reaches a predetermined deposition amount (thickness) for each holding jig 5. It is desirable that the current be cut off.
[0014]
【The invention's effect】
According to the method of the present invention, the wire holding component 22 having good conductivity is used, and the wire 9 is fixed by a method such as caulking through the wire holding component 22, and then set on the holding jig 5. The electroforming is started by energizing the direct current. At the initial stage, the electroforming liquid is first immersed in the liquid surface 18 of the electroforming liquid until the position of the wire holding component 22 having good electroconductivity and left for a short time. Since the wire 9 is electroplated with a metal having good electrical conductivity such as nickel on the surface of the wire 9 for a while and then the holding jig 5 is raised to the position shown in FIG. In addition, it is possible to solve problems such as burning of the resin part of the electroforming jig due to heat generated in the wire during energization without putting a durable member such as a spring part in the electroforming liquid, and the auxiliary hook member 17 It takes time for installation, the cost of the metal tube 19 is increased, and the effective electroforming length is short. It is possible to solve the problem to be.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-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 surface of an electroforming liquid in an electroforming apparatus according to a conventional method.
FIG. 4 is a side view and a plan view of a holding jig showing an embodiment of an electroforming apparatus according to a conventional method.
FIG. 5 is an enlarged side sectional view showing an embodiment in the case of using a metal tube 19 according to a conventional method.
FIG. 6 is an enlarged side sectional view of the vicinity of the line holding component 22 according to the present invention.
FIG. 7 is a side configuration diagram showing the configuration of the rotary electroforming apparatus according to the present invention.
[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 material 10 Upper board 11 Lower board 12 Support | pillar 13 Stainless steel 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 22 Wire holding part

Claims (3)

In a method of manufacturing various types of gold pipes in which one or a plurality of wire rods 9 are electroformed using a mother die, and then the wire rod 9 is removed. 9 is fixed, then set on the holding jig 5, initially the holding jig 5 is lowered from the normal position, and once immersed in the electroforming liquid to the position of the wire holding component 22, electroforming is started. Electroforming of various types of brass, characterized by adopting a method in which electroforming is continued with a holding jig 5 raised to a predetermined position after a small amount of electroconductive metal such as nickel is electrolytically deposited. Manufacturing method by. 2. The method for producing various gold pipes by electroforming according to claim 1, wherein a metal pipe having good electrical conductivity is used for the wire holding component. 2. The method for producing various gold pipes by electroforming according to claim 1, wherein various crimp terminals having good electrical conductivity are used for the wire holding component.

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