Eventos Anais de eventos
COBEF 2021
11th Brazilian Congress on Manufacturing Engineering
COMPARISON BETWEEN HIGH PERFORMANCE AND HSC MACHINING IN THE HARD MILLING OF A CURVED GEOMETRY
Submission Author:
Laurence Magalhaes , ES
Co-Authors:
Laurence Magalhaes, Joao Carlos Espindola Ferreira, Marcelo Tramontin Souza
Presenter: Laurence Magalhaes
doi://10.26678/ABCM.COBEF2021.COB21-0167
Abstract
Continuous technological advances in machines, cutting tools, numerical controls, and CAM systems have allowed the advent of hard milling in the manufacture of molds and dies. Its objectives comprise obtaining low tolerances and better surface finishes with shorter times and costs. In this work, a high-performance machine was compared with a high-speed cutting (HSC) machine in the manufacture of a curved geometry similar to those found in some molds and dies. The high-performance machine has a cast iron structure with a maximum spindle speed of 8,000 rpm. The HSC machine has a monobloc structure and a maximum spindle speed of 12,000 rpm. The die was machined in AISI H13 steel quenched and tempered to 52 HRC, with CVD multi-layer coated cemented carbide tools. The comparison was made in terms of total processing time and surface quality. For the amount of material removed, it is inferred that, in the finishing stages, the processing time can be reduced by up to 17% by using an HSC machine. The values of surface roughness of the dies with both machines were lower than 0.8 μm, which can contribute to reduce manual polishing significantly. However, the roughness obtained with an HSC machine was slightly less compared to high-performance machine. Chipping was the predominant wear mechanism in the tools in the roughing stage, whereas abrasion was predominant in the finishing stages.
Keywords
Hard milling, H13 Steel, High Speed Cutting
DOWNLOAD PDF VIEW PRESENTATION
