Ultrasmooth Bar and Wire Formed by Drawing with Protrusion Die

概要

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Recently, smooth bar and wire surfaces for office automation and automobile industry have been required to achieve high fatigue strength. In a conventional process, the drawn bar surfaces are smoothed by additional processes, such as grinding and polishing. However, these processes results in a higher production cost and a lower productivity. To produce ultrasmooth bars by only drawing, a new die was developed and evaluated. The new die had protrusions with hights of 20 - 60 μm in the bearing area. The protrusion die induced high contact pressure and shearing strain on the surface of the drawn bar. In this research, the carbon steel and aluminum bars were drawn using the new die. As a result, surface roughness under the maximum height of irregularities 1 μm was achieved using the new designed die.
The Japan Society for Technology of Plasticityの論文