Issue 48

S. E. Oliveira et alii, Frattura ed Integrità Strutturale, 48 (2019Y) 249-256; DOI: 10.3221/IGF-ESIS.48.26 251 The specimens were machined according to the geometry and dimensions indicated in Fig. 2b) from the plates with dimensions 150x100x5 mm^3 using a Computer Numerical Control (CNC) milling machine, Hass Mikron VCE 500 and a Sandvik carbide tool with a diameter of 20 mm, part number SANDVIK R390-11T308E-NL H13A. The machining parameters used are indicated in Tab. 1. Fig. 3 presents the most relevant details of track strategies for the plate machining to increasing cutting speed. Spindle speed, (rpm) Cutting speed, (mm/min) Axial increment, (mm) Inclination angle axis, (º) 750 50 1.0 0 1500 100 1.0 0 2250 150 1.0 0 3000 200 1.0 0 4500 300 1.0 0 Table 1 : Cutting parameters used in the machining of composite plates. Figure 1 : Scheme of molding apparatus: (a) Composite plate. (b) Rubber base. (c) Pressure transducer. (d) Steel upper die part. (e) Steel lower die part. (f) Aluminum base. (a) Steel upper die part (b) Steel Lower die part (c) Composite plate a) b) Figure 2 : a) Molding cavity; b) Final specimen dimensions (units in mm); c) Curing pressure.