Extrusion of scroll against counter pressure

Abstract

An extrusion method for manufacturing a scroll product for an air compressor having long spiral fin is developed. In this extrusion method, a floating counter tool supported by a constant force controls the length of the extruded spiral fin uniform and the surface of the extruded end flat. Although the average counter pressure to make a uniform length is about 3 % of the flow stress, the pressure to flatten the extruded end is higher than 40% of the flow stress.