INFLUENCE ON THE FEED-RATE AND MQF IN THE SURFACE ROUGHNESS AND CUTTING FORCE COMPONENTS DURING THE AISI 420C TURNING WITH STANDARD AND WIPER TOOLS.
André Faraon Rodrigues1; Cássio Magalhães dos Reis1; Matheus Nunes Duran1; Guilherme Cortelini da Rosa1; André João de Souza1
1 Universidade Federal do Rio Grande do Sul
doi:10.20906/CPS/COB-2015-0643
Resumo
The machining processes can be associated with the cutting forces and surface texture. The cutting forces can be represented by three orthogonal components (feed force Ff, passive force Fp and main cutting force Fc). The surface texture can be quantified by roughness parameters such as Average Roughness (Ra) and Total Roughness (Rt). In this work, a study of the orthogonal cutting forces and the analysis of Ra and Rt generated on the finish turning of AISI 420 stainless steel using minimum quantity of fluid (MQF) were made. The influence of input parameters (feed rate, cutting tool geometry and MQF) on the surface texture and the cutting forces is assessed in a comparative way. A CNC lathe Mazak QTN 100-II was used to machining two workpieces using two different cutting tool geometries (standard and wiper), four different feed rates (0.15, 0.20, 0.25 and 0.30 mm/rev.) and three different MQF flow rates (1.4, 2.0 and 3.0 ml/s), totalizing 24 samples. A Surftest Mitutoyo SJ-201P was used to measure the Ra and Rt, and a data acquisition system was used to acquire on-line the Ff, Fp and Fc generated during the turning. The experimentally obtained data showed that the both roughness parameters and all orthogonal cutting force components for wiper tool were much lower than the standard tool. Moreover, the variation of the MQF flow rate did not significantly affect the roughness parameters with both tool geometries. However, the cutting forces decreased with higher flow rates of MQF.
Palavras-chave: finish turning; minimum quantity of fluid; cutting force components; machining surface roughness; stainless steel AISI 420C