JP2004322204A - Dry ice type internal high-pressure endurance reinforced steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member having a strength higher than that of a lighter member. <P>SOLUTION: If a high pressure is applied from inside, even a soft member, a weak member or a member with poor durability raises its durability. However, in this case, even if it becomes strong as the member, it becomes not so easy to use or come to be hard to handle and require consideration to an environmental problem or the like in relation to the use of carbon dioxide. On the other hand, making it stronger and lighter can improve it as the member or raw material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
Technical method as a durable material of internally high pressure processed metal in the metal processing technology field in mechanical engineering.
[0002]
[Prior art]
Conventional steel pipes are made of hollow metal inside the machined metal to reduce weight and cost to keep the amount of material down, or a metal processed product that combines a certain strength with ease of use as a member. A technology in which the outside air and the air inside the steel pipe are at the same pressure. Or metal processing technology that does not use dry ice even if it is a high-pressure pipe inside the member.
[0003]
[Problems to be solved by the invention]
For conventional steel pipes, it is necessary to increase the weight of the steel pipe or increase the thickness as a member of the steel pipe in order to increase the strength of the steel pipe in order to overcome a certain strength limit or strength limit, In particular, there was a limit to the durability in the horizontal direction when the steel pipe was set up vertically.
[0004]
[Means for Solving the Problems]
If the force acting from inside the steel pipe against the load and pressure received from outside the steel pipe acts, it becomes the strength or durability of the member itself.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
As a steel pipe material, a ductile and malleable steel pipe material is used to prevent cracks due to deterioration.
One end of the steel pipe and one of the holes or holes at the end are welded with a joining material or hard solder to block the air. After cooling for a certain period of time, pour incombustible oil from the other unwelded hole, and after reaching the inside of the steel pipe, leave enough oil to cover the film inside the steel pipe. Drain through the hole into which the oil is poured. Then, insert dry ice with a volume about one-tenth of the volume in the steel pipe from the hole where the non-combustible oil is discharged. Then, the other part or hole that has not been welded is welded using a joining material or hard solder, etc., to perform air blocking. Wait for the dry ice inside the steel pipe to completely evaporate at or below normal room temperature. When the steel pipe is pressurized, the end of the welded end is sharpened with a cap or a general steel pipe. Connect with a pipe so that it can be used for each purpose.
[0006]
【Example】
The load-bearing part of a lightweight pipe bed. Loaded pipe-type member for lightweight bicycles.
[0007]
【The invention's effect】
The steel pipe in this method is designed to support the pressure of the force received from the outside or the load pressure from the inside of the steel pipe against the pressure of the force received from the outside or the load pressure, so the durability as strength is Increase. In addition, the low melting point and freezing point temperature, which are the characteristics of dry ice, suppress the temperature change of members or changes in the environment, and the cost of dry ice itself, ease of handling as a material, and dry ice We believe that the low flammability and low toxicity of carbon dioxide when it is vaporized will contribute to weight reduction as a member by using the vaporized gas and enhance safety.
[Brief description of the drawings]
Fig. 1 External view of a steel pipe [Fig. 2] External view of a high-pressure type durable steel pipe inside a dry ice pipe [Explanation of reference numerals]
1 outer diameter material of steel pipe 2 hole in steel pipe 3 joining material such as hard solder

Claims (1)

In order to maintain high durability and strength for lightweight steel pipes, one end of the end of the steel pipe is completely sealed by welding or other work, and then the inside of the steel pipe is highly nonflammable. After coating with dry oil, put dry ice in the steel pipe, and use the welding or other work to weld the air inside the steel pipe to the other end of the steel pipe, which corresponds to the part of the steel pipe that is exposed to outside air. When dry ice is inserted into the steel pipe before shutting off air and completely shut off or completely sealed, dry ice inside the steel pipe evaporates due to outside air temperature. Using the force of high pressure inside the steel pipe, while standing in a lightweight state, especially in the part where you want to increase the strength, Lateral portions of the case, and further the durability of the steel pipe itself, a method of increasing the strength.

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