JPH01288803A - Connecting parts having small-diameter hole and its production - Google Patents

Abstract

PURPOSE:To facilitate grinding and polishing and to enable mass production by forming the connecting part having a small hole of crystallized glass of a calcium phosphate system. CONSTITUTION:The crystallized glass raw material of the calcium phosphate system is melted and the melt thereof is cast and molded by using a metallic mold coated with ceramics on the inside surface at the time of producing the connecting part having the small hole 3, for example, a connector 1 for connecting optical fibers 4. This molding is pierced with a very small lead hole by laser light and after a filamentous body with abrasive grains is passed into this small hole 3, the molding is crystallized by heating. Since the crystallized glass of the calcium phosphate is cast by the casting mold, the molding is easy and said glass is suitable for mass production. Since the polishing and grinding are easy, the excellent dimensional accuracy is obtd. and the production is advantageous in terms of cost.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a connecting part having a small diameter hole and a method for manufacturing the same.

<Prior art> Connecting parts with small diameter holes, such as optical fiber connectors, are conventionally made by drilling a small hole into which an optical fiber is inserted into a molded product made of ground and polished ceramic such as alumina or zirconia. was forming. Ceramics such as alumina or zirconia have been used as connectors for connecting optical fibers because these ceramics have the same coefficient of linear expansion as the optical fiber, and they do not have the same coefficient of linear expansion as the optical fiber. This is because expansion does not occur and a reliable connection state can be maintained.

<Problem to be solved by the invention> However, in such conventional technology, since ceramics such as alumina or zirconia are used as materials, grinding/polishing and hole machining are extremely difficult, making them unsuitable for mass production. Met.

It was also disadvantageous in terms of cost.

The present invention has been made in view of these conventional problems, and it is an object of the present invention to provide a connecting part having a small-diameter hole and a method for manufacturing the same, which can solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the inventor of the present invention has intensively researched materials that can replace conventional ceramics such as alumina or zirconia. We found that this problem can be solved.

That is, the connecting component having a small diameter hole according to the present invention is
It is characterized by being made of calcium phosphate crystallized glass, and its manufacturing method is as follows:
A calcium phosphate-based crystallized glass raw material is melted, the molten raw material is cast and molded in a mold, a micro-hole is formed in the molded product using a laser beam, and an abrasive-coated filament is passed through the micro-hole. It is characterized in that small holes are formed, and after the small holes are formed, the molded product is heated and crystallized.

Function> Calcium phosphate crystallized glass (CaO-PzOs crystallized glass) can be melted at a relatively low temperature of about 1200"C, then cast and molded in a lost wax state, and then heated to about 750"C. It becomes a crystallized glass crown consisting of microcrystals by crystallizing at a temperature for several hours (see Japanese Patent Publication No. 11625/1983).
. As described above, unlike ceramics such as alumina or zirconia, this calcium phosphate crystallized glass can be cast using a mold, so it is easy to mold and suitable for mass production. In addition, polishing and hole processing are easy, and the shrinkage rate is "0" even when heated and crystallized after molding, so it has excellent shape reproducibility and dimensional accuracy. Furthermore, it is advantageous in terms of cost compared to the conventional method.

Embodiment A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a connector for connecting optical fibers as a "connection component having a small diameter hole." This connector 1 is
Calcium phosphate crystallized glass (CaO-T)
The entire body has a cylindrical shape, with male and female stainless steel casings 2 fitted on the outside by cold press fitting, and a small casing with a diameter of 0.2 rrtn inside. The hole 3 is formed in a penetrating state.

A quartz glass optical fiber 4 is inserted into each of the small holes 3 in advance, and by fitting the casings 2 together, the ends of the two optical fibers 4 can be connected to each other. It is something.

FIG. 2 is a diagram showing a method of manufacturing this connector 1.

As a method for manufacturing this connector 1, the following steps are performed in order.

Phosphoric acid (
H,PO,”), calcium carbonate (CaCOi),
Put titanium oxide (Ti(h) into a melting container and heat it to 1200~
Melt at 1300°C for 1-2 hours.

Money! The molten raw material is put into a mold and cast into a cylindrical shape. Since the inner surface of the mold used is coated with a ceramic coating for mold release, the molded product can be easily removed from the mold, and the mold is not eroded by molten raw materials.

2) Polishing the outer surface of the molded product cast into a cylindrical shape. This molded product is easier to polish than conventional ceramics such as alumina or zirconia, and does not require diamond abrasive grains.

Then, a YAG laser beam is used to form minute holes in the center of the molded product in the order of 0°15. Hole processing using this laser beam can also be performed more easily than in the past.

Next, a filament with abrasive grains other than diamond is passed through this microhole to form a small hole 3 of 0.2 rm.

Since the material is calcium phosphate crystallized glass, the small holes 3 can be easily formed without using diamond abrasive grains.

The molded product with small holes 1 formed in it was heated at 740°C for 2 hours at 795°C.
Crystallize for 5 hours at °C for a total of 7 hours.

During this heating crystallization, the heat shrinkage rate of the molded product is "0", so the shape of the molded product is maintained accurately.

Then, when the crystallization is completed, the connector 1 is completed.

The glass composition of connector 1 thus completed is 45:CaO, 25:Ti0z, 30:h in molar ratio.
It becomes Qs. Moreover, the physical properties are as follows.

Specific gravity: 3.035 Heat resistance: 1000°C Bending strength: 2000kg/d Specific heat: 7X10-'J/g-Thermal conductivity: 12X10-'W/m-Thermal diffusivity: 5
X 10-3c4/sec Young Rate:
0.6X106 kg/cnl Coefficient of thermal expansion: l
lXl0-' In this way, the physical properties of the connector 1 are similar to those of the quartz glass optical fiber 4 to be connected, so the connector 1 and the optical fiber 4 expand and contract in the same way, ensuring a secure connection. The status remains the same.

In the above description, a connector for connecting an optical fiber was used as an example, but the same applies to other connecting parts having small-diameter holes.

<Effects of the Invention> Since the connecting component having a small diameter hole and the manufacturing method thereof according to the present invention are as described above, various effects as described below can be achieved.

(a) Polishing and hole processing are easy, and molding workability is improved.

(b) Since it is cast and molded using a mold, molding is easy and mass production is possible.

(C) The shrinkage rate during heating crystallization after molding is “0”.
”, it is possible to ensure highly accurate formability.

(d) When used as a connector for connecting optical fibers, the physical properties of the connector are similar to those of optical fibers, so a reliable connection can be maintained.

(e) It is cost-effective compared to conventional ceramics such as alumina or zirconia.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a connector showing an embodiment of the present invention;
FIG. 2 is an enlarged cross-sectional view showing the part indicated by the arrow (■) in FIG. 1, and FIG. 3 is a process diagram showing the method for manufacturing the connector. 1- Connector (connection parts) 2- Casing 3- Small hole 4- Optical fiber Figure 1

Claims (3)

[Claims] (1) A connecting part having a small diameter hole, characterized in that it is made of calcium phosphate-based crystallized glass. (2) Melting the calcium phosphate-based crystallized glass raw material,
The molten raw material is cast and molded in a mold, micro-holes are formed in the molded product using a laser beam, a filament with abrasive grains is passed through the micro-holes, and small holes are formed. A method for manufacturing a connecting part having a small diameter hole, characterized by heating and crystallizing a molded product after forming the small hole. (3) The method for manufacturing a connecting part having a small diameter hole according to claim 2, wherein the mold is a mold whose inner surface is coated with a ceramic coating.