Reducing Abrasive Particle Generation in Dry Rotary Swaging by Utilizing DLC Hard Coated Dies

¹ IWT Leibniz Institute for Materials Engineering, Laboratory for Precision Machining, Badgasteiner Straße 3, 28359 Bremen, Germany
² bime Bremen Institute for Mechanical Engineering, University of Bremen, Badgasteiner Straße 1, 28359 Bremen, Germany
³ MAPEX Center for Materials and Processing, University of Bremen, Am Fallturm 1, 28359, Bremen, Germany

^* Corresponding author: boehmermann@lfm.uni-bremen.de

Abstract

The emphasis of this paper is the investigation of the impact of the diamond like carbon (DLC) hard coating system on the amount of abrasive particles being generated during dry rotary swaging. Rotary swaging experiments applying coated and uncoated macro structured forming dies were carried out against aluminum and steel work pieces varying the process parameter feed velocity. It was found that DLC coatings effectively reduce the generation of abrasive particles from the work piece. For dry machining of aluminum the amount was reduced to a tenth of the original quantity achieved with uncoated dies. The results are discussed with regard to the mechanics of interfacing surfaces. Additionally, forming dies exhibiting macro structures surfaces of improved design were introduced and applied in dry rotary swaging experiments, which allowed minimizing the abrasive particle generation.