JPS625769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a ceramic pipe, and more particularly, to a method for forming a ceramic pipe having fine diameter through holes.

<Prior art and its problems> Conventionally, there is a method for forming ceramic pipes as disclosed in Japanese Patent Publication No. 43-2444.

As shown in FIG. 5, in this prior art, a wire rod 2 is drawn out horizontally one after another by wire drawing devices 100, 100 provided on both sides, and is buried in an extruded base material 1 extruded by an extrusion molding machine A. The ceramic pipe is extruded into a shape, and then the molded product is fired to eliminate the wire 2 and form a ceramic pipe.

However, in the case of this prior art, unless a wire tensioning device 100, 100 is installed to horizontally feed out the other wire 2 of the extrusion molding machine A at the same speed as the extrusion speed of the extruded material 1, a straight line in the center Ceramic pipes with through-holes cannot be manufactured, resulting in high manufacturing costs.

In addition, in the case of this prior art, the molded product B is
is supported on both ends, so if the wire 2 is cut midway, the tension in the wire 2 is released and subsequent feeding of the wire 2 becomes impossible. Therefore, in order to form a ceramic pipe of a desired length, it is necessary to extrude a long molded product, then fire the molded product to eliminate the wire rod 2, and then cut it. Due to restrictions, complicated processing work is required separately.

<Technical Problem> The technical problem of the present invention is to extrude a flammable core wire without using a pair of feeding devices that mechanically feed out the core wire under tension. The method is to embed the material in the container and extrude it.

<Technical means> The technical means taken to achieve the above technical problem is that a screw is built into the internal substrate flow path, and a substrate flow path is installed at the tip of the extrusion molding machine that extrudes the ceramic extruded substrate using the screw. An extrusion channel is provided that extends vertically and has a nozzle opening at its lower end, and a through hole is provided in the extrusion channel that extends vertically to a position close to the nozzle opening and is concentric with the center of the nozzle opening. A combustible core wire suspended so as to be drawn out is inserted into the through hole and its tip is positioned in the nozzle opening, and the extruded base material is extruded from the nozzle opening by the extrusion force. The core wire is forcibly drawn out, buried in a base material, extruded, and then the molded product is cut and fired in an oxidizing or inert atmosphere.

<Example> Next, an example of the present invention will be described based on the drawings.
A'' is built in, and the extruded ceramic substrate 1 is extruded with the screw a'', and the flow path is placed at the tip of the substrate flow path a'.
An extrusion flow path 100 is provided that communicates with a′ and extends vertically, and has a lower end as a nozzle port b. Through hole at the same position as the core
It is constructed by disposing a core c having a diameter c', and suspending a combustible core wire 2 inserted into the core c so that it can be fed out into the nozzle opening b.

The extrusion channel 100 has a cylindrical body whose top surface is covered, connected to the tip of the substrate channel a', and a nozzle port b at the bottom end of the cylindrical body.
It is formed by connecting a base a having a shape.

The extruded ceramic base 1 is a material obtained by blending ceramic powder such as alumina with viscosity as a plasticizer, an organic binder, and water or a solvent.

The core c has a through hole c' through which the combustible core wire 2 is inserted, and is inserted into the mouth a of the molding machine A so that the tip of the through hole c' is at the same position as the mouth core of the nozzle mouth b. The core wire 2 is suspended in the nozzle opening b by being fixed in a hanging manner or by any other arbitrary means.

The flammable core wire 2 has a through hole 1' that is passed through the pipe.
For example, an ultra-fine diameter having an outer diameter corresponding to the diameter of
It is made of, for example, nylon fishing line, etc., which is extinguished by oxidation or combustion in an inert atmosphere at a diameter of 0.01 mm to several mmφ, and the core wire 2 is inserted into the through hole c' inside the core bar c, and in a state where it can be fed out. Nozzle mouth b
When the extruded base material 1 is discharged, it is fed out together with the extruded base material 1 and embedded within the material 1. This feeding is performed by automatically applying an extrusion force as the extruded material is discharged, and the core wire 2 is wound around a freely rotatably supported feeding roller 3, and the tip of the core wire 2 is attached to the extruded material. When discharging 100, pay out together.

Incidentally, if a large number of through holes 1' are required for the type of pipe to be formed, the combustible core wire 2 is suspended in a number corresponding to the number of through holes 1'.

Therefore, the base material 1 extruded from the nozzle port b is
There is a flammable core wire 2 inside due to its discharge pressure and viscosity.
A molded product 4 is extruded with the wire inserted, which is cut to the required length, dried, and then burned in an oxidizing or inert atmosphere to eliminate the flammable core wire 2 and form a fine-diameter through hole inside. A ceramic pipe B having a diameter of 1' is obtained.

Incidentally, the ceramic pipe B molded by the molding method of the present invention can be used as a ceramic capillary for a pen tip or the like.

<Operations and Effects of the Invention> As described above, the present invention has a screw built into the internal substrate flow path, and a screw extending vertically in communication with the substrate flow path at the tip of the extrusion molding machine that extrudes the ceramic extruded substrate with the screw. An extrusion flow path is provided with the lower end serving as a nozzle opening, and a core metal is disposed within this extrusion flow path that extends vertically to a position close to the nozzle opening and has a through hole at a position concentric with the nozzle opening core. , a flammable core wire suspended so as to be drawn out is inserted into the through hole, its tip is positioned in the nozzle opening, and the core wire is forcibly drawn out by the extrusion force of the extruded base material extruded from the nozzle opening. The ceramic pipe is embedded in a base material and extruded, and then the molded product is cut and fired in an oxidizing or inert atmosphere, making it possible to manufacture a ceramic pipe with a through hole in the core.

Therefore, unlike the prior art, there is no need for the process of forcibly moving the core wire horizontally while keeping it in tension using wire tensioning devices installed on both sides. The core wire is buried in a straight line within the same base material, and a ceramic pipe having a through hole in the pipe core is manufactured.

Therefore, there is no need for a feeding device that feeds out the core wire at the same speed as the base material extruded by the extrusion molding machine, and manufacturing costs can be reduced.

Moreover, since the flammable core wire is forcibly drawn out from a suspended state by the extrusion force of the extruded base, the lower end remains free, so when obtaining a ceramic pipe of the desired length, The extrusion molded product can be cut to meet the requirements, and unlike the prior art, the troublesome processing process of cutting the ceramic pipe after firing is not required, and the manufacturing process is not complicated.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show an example of the method for molding a ceramic vip according to the present invention, in which Fig. 1 is an enlarged sectional view of the main part, Fig. 2 is an enlarged sectional view of the extruded product before firing, and Fig. 3 is an enlarged sectional view of the extruded product before firing. FIG. 4 is an enlarged sectional view taken along the - line, and FIG. 5 is a sectional view of an extrusion molding machine in a conventional molding method. In addition, in the figure, A: extrusion molding machine, b: nozzle opening,
2: flammable core wire, 1: extruded base material, a': base flow path,
a″: screw, 100: extrusion channel, c′: through hole, c: core bar, 1′: through hole, a: mouthpiece.

Claims (1)

[Claims] 1. At the tip of an extrusion molding machine that has a built-in screw in the internal substrate channel and extrudes the ceramic extrusion substrate using the screw, an extrusion channel is provided at the tip of the extrusion molding machine that communicates with the substrate channel, extends in the vertical direction, and has a lower end as a nozzle opening, In this extrusion flow path, a core bar is provided that extends vertically to a position close to the nozzle opening and has a through hole in a position concentric with the nozzle opening core, and a flammable core wire that is suspended so as to be drawn out is placed above the extrusion channel. The core wire is inserted through the through hole and its tip is positioned in the nozzle opening, and the core wire is forcibly drawn out by the extrusion force of the extruded base material extruded from the nozzle opening, embedded in the base material, and extruded. A method for forming a ceramic pipe, which comprises cutting the post-molded product and then firing it in an oxidizing or inert atmosphere.