JP3775496B2 - Cylinder manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plating technique for manufacturing a cylinder with high accuracy.
[0002]
[Prior art]
In the past, when the core wire was heated by flowing current through the core wire and the core wire was thermally expanded, the electroformed layer was not formed in the electrolyte. An important accident such as breakage of the broken wire or cylinder occurred, and it was very difficult to increase the yield.
[0003]
[Problems to be solved by the invention]
To increase the productivity of cylinders constructed from electroformed layers, eliminate the above-mentioned causes of inconvenience and increase the yield.
[0004]
[Means for Solving the Problems]
In the first stage of electrocasting (referred to as a method for forming a cylindrical portion by electroplating), a plating layer is grown in a state where current is passed through a conductive wire that is the core wire and heated and expanded.
Next, after the plated layer reaches a predetermined size, it is taken out from the electrolytic bath, washed thoroughly, and the core wire is separated from the inner periphery of the cylinder formed from the plated layer by cutting off the current. The core wire work can be done easily, and it was possible to prevent damage to the cylinder and breakage of the core wire, which frequently occurred in this process.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In order to clarify the characteristics of the present invention, a case of manufacturing a cylinder which is a connector used for an optical fiber connector will be described.
As shown in FIG. 1, the electrolytic solution 02 is prepared in the tank 01, about 70% of the specified amount of water is injected based on a general bathing method, and the state is heated to about 55 to 60 ° C. Then, 40 g / l of boric acid was dissolved and then adjusted to a ratio of 240 g / l of nickel sulfate or 60 g / l of nickel chloride, and then hot water was poured to a predetermined volume.
In the drawing, the circulation filter or bubbles for stirring the bath liquid are omitted. A positive electrode plate 03 is provided on the outer periphery (near the outer wall) of these bathtubs, and a plurality of core wires 04 are provided on a vertically movable support pillar 09 provided substantially in the center portion using vertical support tools 06 and 08. Arrangement and electrical connection to a common one end (for example, the upper end) of these by a connection line 11 for energization at the same time, and the connection line 11 and a negative electrode corresponding to the positive electrode described above as a main DC power supply Connect to PM.
Next, a conductive core wire, which is a feature of the present invention, for example, a wire made of stainless steel having a thickness of 0.120 .phi.mm is used as a core wire, and the upper end portion is connected by the electric connection line 11 and the lower end portion is connected to the lower connection line 10. The lower tip of each is electrically connected to each other, and a power source PH for heating the core wire is connected between the electrical terminals of the upper connecting wire 11 facing the connecting wire 10 so that a current flows through the core wire, and the bath temperature Control power to be higher than
In a state where the temperature of the core wire is higher than the bath temperature of about 55 ° C., in other words, the power of the heating power source applied to the core wire is adjusted so that the bath temperature TL <the temperature TM of the electrolytic plating layer <the temperature TC of the core wire. .
When the target cylindrical outer diameter was 1.25 mm, the plating layer grew in about 7 hours and 30 minutes. This result was in accordance with the general Faraday law.
The cylinder 05 having a length of 50 cm thus manufactured is removed from the fixture 07 on the upper support plate 06 and omitted from the lower figure, but the metal fittings for hanging the core wire in a straight line are removed. A core wire 04 and a part of the cylinder 05 indicated by A in FIG. 1 are taken out from the core wire as shown in an enlarged view in FIG. 2, and a cross-sectional view thereof is observed with an SEM as shown in FIG. Although it was difficult, there was a gap between the inner diameter of the cylinder 05 grown from the electrolytic plating layer and the outer diameter of the core wire 04 as shown by the dotted line 41 although it was very small.
When the length of the cylinder is 10 mm without subjecting the conventional core wire to heat treatment, the force required for drawing the core wire requires 550 g or more, but the core wire 04 is heated and expanded by the method of the present invention. The force required to pull out the core wire 04 from the cylinder on which the initial electroplating layer is formed is 230 g or less, and although it is clearly numerically small, in principle the cylinder is in a state close to the bath temperature in the final stage. Since the electrolytic plating layer is formed, the influence of the heat from the core wire on the outer peripheral portion of the cylinder is small, and the portion that undergoes the largest thermal contraction after being taken out from the tank 01 is the core wire 04 itself. A difference in the outer diameter of the core wire 04 from the inner diameter of the wire occurs, and the wire drawing work becomes easy.
As a result, the release agent is applied to the core wire as in the past, and the electroplating layer is not formed uniformly due to the non-uniformity of the film thickness, and it is difficult to obtain a cylinder with high accuracy. Although the most recent core material has been selected to be a material that is difficult for electroplating to adhere, a high percentage of defects have occurred in the centering work, but the application of the present invention has eliminated these causes of failure, so a high step It is now possible to carry out production with a distillate.
[0006]
【The invention's effect】
It is possible to produce a cylinder with a high yield, and it is expected to provide an inexpensive optical fiber connector, which is industrially valuable.
[Brief description of the drawings]
FIG. 1 schematically shows a cylinder manufacturing method of the present invention.
FIG. 2 is an enlarged view of the portion of FIG. 1A.
FIG. 3 is a view of a plane obtained by cutting the enlarged view of FIG. 2 along a plane perpendicular to the axis.
[Explanation of symbols]
01 Bath 02 Electrolyte 03 Positive electrode plate 04 Core wire 05 Cylinder 06 formed by electroforming layer by plating 06 Upper support plate 07 Fastener 08 for fixing the core wire to the upper support plate 08 Lower support plate 09 Support column 10 made of insulating material Lower core wire terminal electrical connection wire 11 Upper core wire terminal electrical connection wire A Core wire and part of cylinder PM Electroplating power source PH Core wire heating power source 41 State on the image when each core wire is contracted

Claims (1)

Apart from the power P _M for the electroplating, provided the power P _H for applying the core heating, characterized by performing heat-electrically-expanded upcoming state casting process the core wires, predetermined electroformed layer Cylinder manufacturing method in which the core wire is disconnected after being formed

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