Um estudo comparativo do comportamento das afiações conica e conica radial (racon) em brocas helicoidais de aço rapido / A comparative study of conical and radiused conventional point (racon) behaving in high speed stell twist drill

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

The main goal of this work is to study the behaving of Racon (radiused conventional point) and Conical (conventional) drill points in high speed stell twist drills and analyse their performance, trying to correlate them to their geometrical features. For this purpose, tests with two different machinability materiais, the SAE 4340 and SAE 1045 steeIs, were carried out by using three different cutting speeds associated to an specific feed for each material. The drill points were tested by repeating three times the cutting condictions to each point, avoiding the random influences inherent to them and increasing the obteined samples both in quality and quantity. Cutting length, cutting forces (torque and thrust force), flank wear evolution and widening of the machined holes were supervised through out these tests. Hipoteses to explain toollife behaving and cutting forces (torque and thrust force) were generated with the obtained results. It was verified the superiority of Racon drill point in tool life when the SAE 4340 stell was used. But cutting forces in Racon drill point were inferior when compared to the conventional one in almost all cases, except the thrust force to the third cutting condiction in SAE 1045 steel. Through all these considerations it s presumed that Racon drill point behaving tends to be similar in performance in other cutting condictions in the tested materiaIs and possibly in other materiaIs showing its evolution over the conventional drill point

ASSUNTO(S)

maquinas de furar e alargar machining drill and wide machines usinagem

ACESSO AO ARTIGO

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