Estudo teórico-experimental do efeito da flexão da ferramenta no processo de microfresamento / Theorical and experimental study on tool deflection effect in micromilling process

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The tool deflection, in end milling operations, is responsible to intervene negatively on the workpiece surface quality and can also cause a premature tool failure (breakage).The present work aims at studying experimentally the effects of tool deflection when end milling with 0,8 mm diameter in microoperations. The experimental tests had intended to identify which parameters of milling show more influence in tool deflection. The chosen milling parameters for the study were: cutting speed, feed rate, depth of cut and step over. The tests aim to investigate, beside the recommended parameters from tool manufacturer, a 25% higher and 25% lower conditions. The force acquisition was made in all tests. The measured forces shown that they are directly related to the uncut chip cross section, in accordance with theory. For comparative purpose, the maximum experimental force value was applied in the finite elements method (FEM) simulation of the tool and indicates a similar behavior of an encastré beam. The microscopic analysis of the superficial aspect of the milling showed that smaller feed per tooth results in better finishing, as observed in the conventional process. The knowledge of the effect of the cutting parameters in the micromilling process has the intention of offering information for industries to improve the planning and process of manufacturing.

ASSUNTO(S)

tool deflection flexão de ferramenta cutting forces micromilling microfresamento micromanufacturing forças de corte processos de microfabricação

ACESSO AO ARTIGO

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