Title: Co-spray-formed graded steel for micro rotary swaging tools

Authors: Chengsong Cui; Alwin Schulz; Eric Moumi; Bernd Kuhfuss; Florian Böhmermann; Oltmann Riemer

Addresses: Foundation Institute for Materials Science, Badgasteiner Str. 3, 28359 Bremen, Germany ' Foundation Institute for Materials Science, Badgasteiner Str. 3, 28359 Bremen, Germany ' Bremen Institute for Mechanical Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany ' Bremen Institute for Mechanical Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany ' Laboratory for Precision Machining (LFM), University of Bremen, Badgasteiner Str. 2, 28359 Bremen, Germany ' Laboratory for Precision Machining (LFM), University of Bremen, Badgasteiner Str. 2, 28359 Bremen, Germany

Abstract: Micro rotary swaging tools are required to have different material properties in different functional areas. These requirements can be fulfilled by applying different materials in the specific regions of the tools. The different materials can be combined with a gradient zone in between to reduce critical stresses at the interface during heat treatment and in swaging process. Such graded tool materials are supposed to be manufactured by means of a newly developed co-spray forming process. In this study, a flat deposit of graded tool steel (HS6-5-3C/HS6-5-2C) was produced via co-spray forming, followed by hot rolling and heat treatment. Micro infeed rotary swaging tools with fine geometrical structures were precisely machined from the graded steel. The tool performance during swaging of stainless steel wires was evaluated.

Keywords: micro forming; rotary swaging; tool steel; spray forming.

DOI: 10.1504/IJMMS.2017.087530

International Journal of Mechatronics and Manufacturing Systems, 2017 Vol.10 No.3, pp.185 - 205

Received: 14 Jan 2016
Accepted: 29 Apr 2016
Published online: 18 Oct 2017 *

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