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.

1. Tubing using extra-short cutting rods
Tohsei Kokan 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. 

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.

2. Extra-long tube stretching
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.

Note:
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.
For Tubing using extra-short cutting rods and Extra-long tube streching;
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