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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. |
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| [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. |
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| [Sales items] |
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♦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 |
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| [Comparable to electrolytic polishing in inner surface roughness] |
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♦three-roll finishing
Sample:SUS316L Rz=0.6μm Rz JIS=0.6μm |
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♦Electrolytic polish finishing
Sample:SUS304TP Rz=0.6μm Rz JIS=0.6μm |
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Features |
| 1. |
Processing accuracy unit for inner and outer diameters is 0.01 mm. |
| 2. |
Processing reduces deviations in wall thickness. |
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Lower frictional resistance improves surface roughness. |
| 4. |
Processing enables high reduction, ensuring finer grain and improved mechanical strength. |
Notes: |
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Cost rises due to expensive tools and slow processing. |
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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. |
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Product inspection |
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Dimensional inspection |
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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. |
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| 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. |
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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 |
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