Tohsei Kokan
Tohsei, a metal coordinator, responds to individual customer specification needs.
Tohsei Kokan
Tohsei Kokan
 
[Order and inquiries / Special Tubes Dept.] +81-3-3668-0381E-Mailmail
Tohsei Kokan
Tohsei Kokan  
Tohsei Kokan Co.,Ltd.
Sales information
Tubing
Deformed Tubing
Roll-forming
Steel and flat steel for structural purposes
Steel Work
Materials and Equipment for Piping
Wide variety of secondary processing
Uitra-High-Performance Tubing
Manufacture of Ultra High-Performance Tubing
Making and stretching pipes from special metals
Cladding and specialized drawing
Company information
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Company Overview
Plants and Offices
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Ultra-high-Performance Tubing
Manufacture of Ultra-high-Performance Tubing
Manufacturing flow of extra-high accuracy tubes
Tohsei Kokan
Tubing making from extra-short cutting rods and extra-long tube stretching
Tohsei Kokan
Tapered tubes
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PRODUCT
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Ultla-high-accuracy tubes Tohsei Kokan
Tohsei Kokan
Extra high-accuracy pipes
Tohsei Kokan
Extra high-accuracy pipes
Tohsei Kokan
Extra high-accuracy pipes
Tohsei Kokan
Product and packaging
Tohsei Kokan
Extra high-accuracy pipes
Tohsei Kokan
Product and packaging
Extra high-accuracy and surface roughness due to three-roll cold rolling
Tohsei Kokan produces ultra-high-performance tubing with thin walls and tight tolerance manufactured by three-roll equipment developed using its own cold-process technology.
Three cold-roll rolling rolls out the outer diameter using three-rollers and forms the inner diameter using a mandrel.
Tohsei Kokan
[Scope of standard-dimension manufacturing]
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♦Outer diameter: 30 mm or less
♦Inner diameter: 3 mm or more
Be sure to ask about finer plain pipes with sizes other than those above and subjected to three-roll finishing.
Tohsei Kokan
[Sales items]
Tohsei Kokan
♦Low-carbon steel and stainless steel
♦Inconel 600, 625, 718, X-750, hastelloy C-276-X,
monel, nickel-based alloys including nickel-chromium, etc.
♦Iron-based alloys including incoloy 800 and carpenter 20
♦Copper, aluminum, nickel, titanium, tantalum, and niobium
Tohsei Kokan
[Comparable to electrolytic polishing in inner surface roughness]
Tohsei Kokan
♦three-roll finishing
Sample:SUS316L Rz=0.6μm Rz JIS=0.6μm
Tohsei Kokan
Tohsei Kokan
♦Electrolytic polish finishing
Sample:SUS304TP Rz=0.6μm Rz JIS=0.6μm
Tohsei Kokan
Tohsei Kokan
Features
1.
Processing accuracy unit for inner and outer diameters is 0.01 mm.
2.
Processing reduces deviations in wall thickness.
3.
Lower frictional resistance improves surface roughness.
4.
Processing enables high reduction, ensuring finer grain and improved mechanical strength.
Notes:
1.
Cost rises due to expensive tools and slow processing.
2.
Heat treatment in a bright environment is required to maintain high-accuracy surface roughness during heat treatment. Manufacturing is not possible if such heat treatment in a bright environment is not done.
Tohsei Kokan
Manufacturing flow of extra-high accuracy tubes
Manufacturing flow of extra-high accuracy tubes
Tohsei Kokan
Product inspection
 
Dimensional inspection
Tohsei Kokan
Three-roll rolling site Tohsei Kokan Processing site Tohsei Kokan Continuous hydrogen annealing
Tohsei Kokan
Three-roll rolling site
 
Processing site
Continuous hydrogen annealing
Tohsei Kokan
Tohsei Kokan
Tubing making from extra-short cutting rods and extra-long tube stretching
Tube stretching using cold rolling has the following advantages
Three-roll cold processing ensures high accuracy, dimensional tolerance, and surface roughness not attainable in drawing processes (drawing and cold drawing). Other advantages include the following, making effective use of materials.
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1. Tubing using extra-short cutting rods
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Cutting materials from rods are used if materials for tubes including special metals are not available. Three-roll cold rolling enables tube processing regardless of quantity if short rods (20 mmL or more) are available.
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Examples include:
♦22 mm diameter 250 mm L → 4 mm diameter 0.25 mm t 25,000 mm L
♦20 mm diameter 20 mm L → 5 mm diameter 0.5 mm t 600 mm L
Any material can be used except for those with small elongation. This is because of metal characteristics.
Examples: tungsten, molybdenum, berylium.
Tohsei Kokan
2. Extra-long tube stretching
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In drawing, it is not possible to make products exceeding the length of drawing equipment. Longer products become distorted during drawing, causing problems in dimensional accuracy. Three-roll rolling enables rolling of extra-long tubes of 12 M or more while ensuring stable dimensional accuracy, thanks to the special features of this process.
Tohsei Kokan
Note: These products are out of stock and are available only by special order (custom-made).
Orders and inquiries: Special Tubes Dept. Phone: +81-3-3668-0381
Tohsei Kokan
Tohsei Kokan
Tapered tubes
Tohsei Kokan
Tapered tube has a thin tip (upper diameter) and a thick base (lower diameter) with a smooth inclination. It can be made into multipurpose cylindrical, square, hexagonal, and octagonal tubes.
Tohsei Kokan Tapered tubes
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Tohsei Kokan
Tohsei Kokan
Tohsei Kokan
Tohsei Kokan
Tohsei Kokan
Copyright(C)2007. Tohsei Kokan Co.,Ltd. All rights Reserved.