JPS6221722A - Production of tubular body - Google Patents

Abstract

PURPOSE:To obtain a tubular body of high accuracy having a specular surface without uneven wall thickness at a low cost in a simple apparaturs, by solidifying a solidifiable fluid raw material while rotating a rotating body containing the fluid raw material and a liquid having a higher specific gravity than the fluid raw material. CONSTITUTION:(A) A fluidized raw material 7 which becomes a solid at room temperature and changes into a fluid state by heating, e.g. silica sol, thermoplastic resin or glass raw material, and (B) a liquid 6, mutually insoluble in the component (A) and having a higher specific gravity than the component (A), e.g. a compound having a halogen based atom such as dichloroethane or fluorinate, metal which is liquid at room temperature, etc., are put in a tubular rotating body 1 or 5 rotatably provided on a support table 4 through bearings 2 and a motor 3 and rotated at a number of revolutions so as to give >=1G centrifugal force by rotation applied to the component (A) 7. Thereby, a tubular body 7 of the component (A) 7 is formed to be in contact with the free surface of the component (B) 6 formed on the outside and the fluid raw material 7 is solidified while rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a tubular body, and particularly to a method for manufacturing a tubular body with high precision.

[Summary of the Invention] The present invention uses a liquid that is always in a fluid state and has a large specific gravity during the manufacturing process of a tubular body, and a raw material that is initially in a fluid state during the process but solidifies afterward. Put both flowing liquids into a rotatable tubular rotating body and rotate it,
A high-precision tubular body is created by creating a tubular free surface on the outside using a liquid with a high specific gravity, creating a tubular body of raw material in contact with the free surface, and solidifying the raw material while rotating. be.

[Conventional technology]

Conventional methods for manufacturing tubular bodies include the following methods. A high-quality tubular body is obtained by hollowing out the inside of a cylindrical material and performing polishing. A jacket tube for optical fiber was obtained by this method. Alternatively, in Method 1, the melt is passed through a manderel and a die to obtain a tubular product. One method 2 (Phili
ps tech RevVol 5296~IQ1 1
971 45/4) Alternatively, for plastic pipes and concrete pipes, raw materials in a fluid state are put into a rotating tube and solidified while being rotated to obtain a tubular body. □Method 3 (Reinforced plastic VO126411P485 ~ [Problems and objectives to be solved by the invention]) There are various manufacturing methods as described above, but all of the conventional manufacturing methods have drawbacks.

For example, method 1 provides high accuracy, but requires steps such as polishing, which increases costs. There are drawbacks such as the inability to produce long items. Further, in method 2, although the cost is lower, a highly accurate tubular body cannot be obtained due to wear of the die, manderel, etc. This is especially noticeable when making quartz glass tubes with high melting points.

Further, according to method 5, a highly accurate tubular body can be obtained and the cost is low, but there is a drawback that if the n-degree of the original tube is poor, the n-degree of the finished tubular body will be poor.

The present invention is intended to solve these problems, and its purpose is to provide a manufacturing method that can provide extremely high-precision tubular bodies at low cost using simple equipment.

[Elaborate means to solve problems]

The method for manufacturing a tubular body of the present invention is a method that utilizes centrifugal force as in method 5, but in order to improve the drawbacks of the above manufacturing method, in addition to the raw material that becomes the tubular body, a liquid with a high specific gravity is rotated together with the raw material. It is characterized by solidifying the raw material while rotating it in the body to obtain a tubular body.

The manufacturing apparatus used in the present invention may be a simple apparatus as shown in FIG. In the figure, 1 is a tubular rotating body;
2 is a bearing, 5 is a motor, and 4 is a support base. The only requirement for the device is that it has a bearing or is firmly supported.
The rotating body does not require much precision.

If a fluid raw material and a liquid with a large specific gravity are charged together into a rotating body of such an apparatus and the rotating body is rotated, the inside of the rotating body will be in a state as shown in FIG. In FIG. 2, 5 is a rotating body, 6 is a liquid with a large specific gravity, and 7 is a raw material.

If the fluid raw material is solidified in such a state, a highly accurate rotating body can be obtained.

When using raw materials that are solid at room temperature but become liquid when heated (thermoplastic resins, glass raw materials, etc.) as fluid raw materials, they may be heated to a liquid state and cooled while rotating.

When using a thermosetting resin as a fluid raw material, it may be heated while rotating.

When a sol is used as a fluid raw material, a porous tubular dried gel can be obtained by drying the obtained tubular body. Furthermore, by heating to a high temperature, tubular ceramics can be obtained. A glass tube or quartz glass tube can be obtained by using a sol whose main component is silica-based raw material and treating it at high temperature.

The rotation speed of the rotating body should be such that the centrifugal force due to the rotation applied to the fluid raw material is 1 G (G is the acceleration of gravity I) or more, but if it is extremely large or small, the quality and yield may be affected. will be affected.

When using a compound having a halogen-based atom as a liquid with a large specific gravity, for example, dichloroethane, dibromoethane, etc. can be used. In addition, as a compound with a fluorine atom, fluorinate (÷CFt CFt OF,
CFt O+n Montegiline (trade name) etc. can be used.

Although it is a solid at room temperature as a liquid with a large specific gravity, 7104
When using a substance (metal, etc.) that becomes a liquid state, it is sufficient to heat it to a liquid state and rotate it.The metal used here is a material with a relatively low corner point, such as tin, lead, or an alloy thereof. Note that if you want a tubular body with a high f# degree, it is desirable that the rotation axis be horizontal, but the centrifugal force applied to the fluid raw material,
The axis of rotation does not have to be horizontal as long as it is rotated at a rotation speed that is sufficiently large compared to gravity.

[Effect]

According to the above method, a high-precision tubular free surface centered around the rotation axis can be obtained using a liquid with a high specific gravity, regardless of the accuracy of the rotating body as long as the rotation axis does not change. The raw material is in contact with this free surface and assumes a concentric tubular structure. Of course, the inner surface of the raw material itself also becomes a free surface. If the rotation is continued in this state and only the raw material is solidified, the inner surface,
It is possible to obtain a highly accurate tubular body with mirror surfaces on both outer surfaces, no uneven thickness, good roundness, and straightness.

[Example 1] Silica sol 940- and 70 linat (÷OF, OIF
.

CF, OF! O+Q, specific gravity 1.9 Ill, product name of monotigiline) 710- was placed in a stainless steel cylindrical container with an inner diameter of 50 mm and a length of 1 m, and 100 mm was placed around the tube axis.
When gelatinized using Orpm-71, a tubular gel with an outer diameter of 40 layers, an inner diameter of 20 m, and a length of 1 inch was obtained.

Note that the centrifugal force due to the rotation at this time is 1 (Q) at the inner periphery of the tubular gel obtained.''!fc,'/Licasol and Fluorinert do not dissolve in each other.The obtained tubular gel is dried and sintered. Then, the outer diameter is 20 gIm.

A quartz glass tube with an inner diameter of 10 mm and a length of SOO was obtained.

The roundness of the obtained quartz glass tube was 7μ, and the straightness was 0.
2 wm, surface roughness is Q, 05 μm, and extremely high precision.

[Example 2] Similar to Example 1, Silica Sol 940 No. 1! ! and placed in a stainless steel cylindrical container with a Fluorinert 710 dft inner diameter of 50 cm and a length of 11 m, and a 50 rpm rotation around the tube axis.
(The centrifugal force due to rotation is 1G at the inner periphery of the resulting tubular gel) or 2000 rpm (The centrifugal force due to rotation is
The obtained tubular gel was gelatinized while being rotated at 45 G on the inner periphery, and in both cases, as in Example 1, a tubular gel with an outer diameter of 40 mm, an inner diameter of 20 cm, and a length of Ins was obtained. Ta.

When the resulting tubular gel is dried and sintered, it has an outer diameter of 20 m.
, a quartz glass tube with an inner diameter of 10fi and a length of 500m was obtained.

[Example 5] Silica sol 940- and dibromoethane 710- were placed in a polypropylene cylindrical container with an inner diameter of 50+W and a length of 1 inch, and gelled while rotating at 50 Orpm around the tube axis. ■.

A tubular gel with an inner diameter of 20 days and a length of 1 m was obtained. When the obtained tubular gel is dried and sintered, it has an outer diameter of 201 mm and an inner diameter of 10 mm.
1I++1. A quartz glass tube with a length of 500+w was obtained.

[Example 4] Silica sol 140w1 and mercury 710- in inner diameter 50mm,
When placed in a cylindrical polypropylene container with a length of 1+n and rotated around the tube axis at 1500 rpm to gel from fL, a tubular gel with an outer diameter of 40 meshes, an inner diameter of 20 meshes, and a length of 1 mm was obtained. The resulting tubular gel, when dried and sintered, has an outer diameter of 20 m.

A quartz glass tube with an inner diameter of 10 mm and a length of 500 m was obtained.

[Example 5] Polyethylene 150f and Fluorinert 150wt were made with an inner diameter of 103mm. If it can be placed in a stainless steel cylindrical container with a length of 20 cIn and molded while rotating at 200 rpm.
After heating to a temperature of 100 cm, a polyethylene pipe with an outer diameter of 9.5 mm, a length of 20 cm, and an inner thickness of 5 mm was obtained.

[Example 6] Phenol resin 75 tons and Fluorinert 15 o- were placed in a stainless steel cylindrical container with an inner diameter of 10 cm and a length of 20 ctn, heated to a hardening degree while rotating at 200 rpm, and then cooled. .5 cm.

A phenolic resin tube with a length of 20 cm and an inner LitE of 5 m was obtained.

[Example 7] Evogishi resin 145- and 70 linat 150- were made with an inner diameter of 1
The mixture was placed in a stainless steel cylindrical container with a diameter of 0 cm and a length of 206 nm, and was cured while rotating at 200 rpm, to obtain an epoxy tree tube with an outer diameter of 9.5 cm, a length of 20 m, and a wall thickness of 5 cm.

[Actual m row 8] 560t of soda glass and 11QQf of tin were placed in an alumina tube with an inner diameter of 10an, sealed at intervals of 20cIn, and
Melt 4vL of soda glass while rotating at 0 rpm.
After heating and cooling, a glass tube with an outer diameter of 9.5 mm, a length of 20 cm, and a wall thickness of 5 mm was obtained.

〔Effect of the invention〕

As described above, according to the present invention, a fluid raw material that can be solidified and a liquid having a higher specific gravity than the fluid raw material are placed in a tubular rotating body, and while the rotating body is rotated, the fluid raw material is solidified. Therefore, it is possible to manufacture extremely high-precision tubular bodies at low cost using simple equipment. Therefore, it can be widely applied to plastic tubes, ceramic tubes, glass tubes, etc. that require high precision.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a rotating device used when solidifying a fluid raw material at room temperature in this example. 1... Tubular rotating body 2... Bearing 5... Motor 4... Support base FIG. 2 is an explanatory diagram of the interior of the rotating body when the rotating body is being rotated. 5...Rotating body 6...Liquid with large specific gravity 7...Raw material or above 4, +flit body 2. Axle cut 4, support base rotary bag'yL1 reading number 1 ζ, 1 rotating body 4, L p11≦, 6 Hef to Mia "-" 1 explanation to A middle figure 2

Claims (15)

[Claims] (1) Production of a tubular body characterized by placing a fluid raw material that can be solidified and a liquid having a higher specific gravity than the fluid raw material in a tubular rotating body, and solidifying the fluid raw material while rotating the rotating body. Method. (2) The method for manufacturing a tubular body according to claim 1, wherein the solidizable fluid raw material and the liquid having a high specific gravity do not dissolve each other or have low solubility with each other. (3) The rotational speed of the rotating body is such that the centrifugal force due to the rotation applied to the fluid raw material is 1G or more (G is the acceleration of gravity). How the body is manufactured. (4) The method for producing a tubular body according to claim 1, characterized in that a sol is used as the fluid raw material. (5) The method for producing a tubular body according to claim 4, characterized in that silica sol is used as the fluid raw material. (6) The method for manufacturing a tubular body according to claim 1, characterized in that a raw material that is solid at room temperature but becomes liquid when heated is used as the fluid raw material. (7) The method for manufacturing a tubular body according to claim 6, characterized in that a thermoplastic resin is used as the fluid raw material. (8) The method for manufacturing a tubular body according to claim 6, characterized in that a glass raw material is used as the fluid raw material. (9) The method for manufacturing a tubular body according to claim 1, characterized in that a thermosetting resin is used as the fluid raw material. (10) The method for producing a tubular body according to claim 1, characterized in that a resin that hardens at room temperature is used as the fluid raw material. (11) A method for producing a tubular body according to claim 1, characterized in that a compound having a halogen-based atom is used as the liquid having a large specific gravity. (12) The method for manufacturing a tubular body according to claim 11, characterized in that a compound having a fluorine atom is used as the compound having a halogen atom. (13) A method for manufacturing a tubular body according to claim 1, characterized in that a substance that is solid at room temperature but becomes liquid when heated is used as the liquid having a large specific gravity. (14) The method for manufacturing a tubular body according to claim 13, characterized in that a metal is used as the liquid having a large specific gravity. (15) The method for manufacturing a tubular body according to claim 1, characterized in that a metal that is liquid at room temperature is used as the liquid having a large specific gravity.