Mechanical Processing Division
From large and long size workpiece processing
We respond with outstanding technology and quality.
Introduction of machines that can handle longer lengths, etc. More versatile and high-precision machining is realized.
Iijima Koukan has long been actively introducing cutting-edge equipment in pursuit of speed and precision. This is because we always want to respond to our customers' requests with the highest quality. In recent years, we have introduced machines that can handle the longest workpieces, such as a lathe that can handle a 12-meter center-to-center distance and a cylindrical grinder that can handle an 8-meter center-to-center distance. The variation of our ever-evolving high-precision machining services is expanding even further.
One-stop shop for lathe turning, polishing, welding, heat treatment, and other machining processes.
It is no exaggeration to say that our service menu and technical capabilities have been expanded and refined by the many requests we have received from our customers since our establishment. Iijima Koukan is a one-stop shop for a variety of high-precision machining processes, including lathe turning, polishing, welding, and heat treatment. By completing everything within the same plant, we create an environment that facilitates quality control and delivery management.
We respond to the crucial micron-level demands with consistent precision and quality.
A new constant-temperature inspection room was established to guarantee accuracy. Thorough calibration control of measuring instruments.
Accurate measuring instruments are indispensable for processes that require uncompromising high precision, such as rollers for printing and film machinery and shafts for injection molding machines. For this reason, a new constant-temperature inspection room, where the room temperature and humidity are constantly controlled at 20°C and 50%, respectively, 24 hours a day, 365 days a year, was established in the factory to ensure thorough quality assurance and calibration control of measuring instruments. This environment, which is unaffected by changes in temperature and humidity, supports the site where micron-level measurements are made.
Temperature and humidity in the machining area are controlled to Maintain a stable working environment
In order to process metals that expand and contract according to temperature with micron-level precision, the temperature in the machining area is also tightly controlled. The entire plant is air-conditioned to minimize temperature differences throughout the day. In addition, the welding area is divided into separate areas to avoid the effects of oil mist, and humidity is also thoroughly controlled. An ideal working environment is maintained from various perspectives.
Major Facilities
| Equipment Items | (technical) Specification | Number of Machines |
| General-purpose Lathe | ～φ600 x ～8000L | 15 Units |
| CNC Lathe | ～φ1000 x ～12000L | 13 Units |
| Combined NC Lathe | ～φ940 x ～7700L | 11 Units |
| Milling Machine | Vertical Type | 2 Units |
| NC Milling Machine | Vertical Type | 2 Units |
| Cylindrical Grinder | ～φ800 x ～8000L | 16 Units |
| Vertical Polisher | φ660 x 4000L | 1 Unit |
| Honing Machine | Horizontal Type φ65～φ450 x 4000L | 1 Unit |
| Dynamic Balancer | φ600 x 12000L | 3 Units |
| Welding Machine | Arc Welding Machine | 2 Units |
| TIG Welding Machine | 2 Units | |
| Semi-automatic Welding Machine | 2 Units | |
| 100t Press Machine | Core-to-core 4000mm | 1 Unit |
| Electric Furnace | Upper Lid Type 1000 x 1000 x 5000 | 1 Unit |
Pipe & Tubing Division
Mechanical Processing 
Industrial Materials