Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
STUDY OF THE POTENTIALITY TO MANUFACTURE FORMING TOOLS VIA WAAM (WIRE + ARC ADDITIVE MANUFACTURING)
Submission Author:
Henrique Nardon Ferraresi , SC
Co-Authors:
Henrique Nardon Ferraresi, Fernando Matos Scotti, Americo Scotti
Presenter: Henrique Nardon Ferraresi
doi://10.26678/ABCM.COBEM2019.COB2019-0662
Abstract
Techniques for geometric customization and/or repair of tools such as punches and dies, without having to replace them, are of great interest in the mechanical forming industry. This work aims to show the potentiality to manufacture a metallic preform via WAAM (Wire +Arc Additive Manufacturing) over a cast iron substrate, in order to simulate a geometric customization of a cast iron bending tool set. For such, twelve layers of low carbon steel (AWS E70S-6 wire) were deposited over the nodular cast iron substrate through GMAW (Gas Metal Arc Welding) process. To achieve a functional interconnection between the cast iron and the steel, two intermediate layers (buttering) were deposited with an iron-nickel wire. The results show that it is possible to manufacture preforms with good regularity and geometric/dimensional tolerances. Regarding the microstructure, the most critical region is the PMZ (Partially Melted Zone), where there is ledeburite and carbides formation. Despite the high hardness, this microconstituents do not form a continuous lattice, hindering crack propagation. This was shown through Charpy impact tests where specimens notched at the PMZ region presented greater energy absorption compared to those notched at the base metal.
Keywords
Additive manufacturing, Iron Cast Nodular, Custom, waam, welding
