**Maria Dolores Navarro-Mas 1,\*, Juan Antonio García-Manrique 1, Maria Desamparados Meseguer 1, Isabel Ordeig <sup>1</sup> and Ana Isabel Sánchez <sup>2</sup>**


Received: 29 June 2018; Accepted: 27 July 2018; Published: 13 August 2018

**Abstract:** Although there are many machining studies of carbon and glass fiber reinforced plastics, delamination and tool wear of basalt fiber reinforced plastics (BFRP) in edge trimming has not yet studied. This paper presents an end milling study of BFRP fabricated by resin transfer molding (RTM), to evaluate delamination types at the top layer of the machined edge with different cutting conditions (cutting speed, feed rate and depth of cut) and fiber volume fraction (40% and 60%). This work quantifies delamination types, using a parameter Sd/L, that evaluates the delamination area (Sd) and the length (L), taking into account tool position in the yarn and movement of yarns during RTM process, which show the random nature of delamination. Delamination was present in all materials with 60% of fiber volume. High values of tool wear did not permit to machine the material due to an excessive delamination. Type II delamination was the most usual delamination type and depth of cut has influence on this type of delamination.

**Keywords:** basalt fiber reinforced plastic (BFRP); delamination; edge trimming; tool wear
