Fresamento de aço para matrizes VP20ISOF com ferramentas reafiadas

Abstract

The main objective of the present work is to determine the performance of re-sharpened tools. To achieve this, integral cemented carbide end milling tools were tested as new and after they have been re-sharpened, during machining of hard steel used in the mold and die industry. End milling cutters coated with TiAlN and AlCrN were used. The cutting speed was varied, keeping the depth of cut, the cutting width and the feed per tooth constants. Tests were carried out dry. A 23 factorial design was used, considering the following factors (and levels): cutting speed (80 and 100 m / min), Tool coating (TiAlN and AlCrN) and the tool condition (new and reground). The evaluators of performance parameters (output variables) were: the tool life (wear rate), machining forces, torque and surface roughness. The results showed that in general the AlCrN coated tools outperformed the TiAlN coated ones. The performance of re-sharpened tools were very similar to those shown by the new tools, allowing concluding that statistically there is no significant difference between the performance of a new tool and the reground, considering all the output (response) variables.