The Benda Method is a process for manufacturing metal rings using cold-bending processing, welding, and other technologies.
Round steel is cold-rolled into long steel material, bent into a predetermined shape, and then bent in layers to create a spiral. Then, each spiral is cut, welded, and formed into a perfectly circular ring.
Refinements and improvements to this process over many years has led to the establishment of high-quality, high-yield metal ring manufacturing technology that produces an extremely small amount of material loss (scrap).
The raw input is round iron (wire) material.
The material is processed by rollers into elongated steel material with a square cross-section.
The material is bended, and at the same time is wound into a coil form.
The material is cut into rings with overlap.
The cut portions of the rings are welded.
The protruding burr is trimmed away.
The rings are heated to make their overall structure and strength uniform.
This removes scale that has adhered to the surfaces.
The rings are put through a press to correct errors and make them perfectly round.