Pursuing the ultimate roll forging technology

Roll forging, a manufacturing method that is typically used to produce ring shaped parts, is often used to form rotating parts and large gears.
Roll forging offers a number of benefits:
  • It is characterized by extremely high material yields compared to the conventional approach of cutting material prepared by melting or other means.
  • It features good productivity and can be used to manufacture small lots of multiple items as well as large lots.
  • Since the carbon flow is uniform in the circumferential direction, the resulting parts exhibit mechanical properties that are characterized by an extremely high level of strength in the circumferential direction.
  • Distortion during heat treatment has little effect.
  • Dimensional precision is extremely high.

After being to weight and volume that have been calculated based on proprietary expertise, the material is heated to the designated temperature.

The heated material then undergoes rough forging with a 2,000-ton press and various other presses.
Once formed into a shape that roughly approximates the final product shape, the material is reheated.

Then the material is rolled in five ring rolling mills that are capable of manufacturing rings that vary from 600 mm to 2,700 mm in size. Ring diameter is increased while reducing the rings’ wall thickness with seven synchronized rolling steps. In this way, the material is formed into the specified dimensions and shape.

Completed rings are cooled and then transported to the cutting Factory.
We use a stick lathe from a ring cutting machine we developed jointly with the manufacturer to finish the rings to the final product height.
A heat treatment company has established a presence at our Nahari Factory, which was completed at the end of 2006. By bringing the specifications required by customers to fruition in all of these areas, we deliver dramatically shorter lead times and reduced transport costs.