Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Abstract

Abstract:The drilling of carbon fiber reinforced polymer (CFRP) plate is very critical in its structural applications in aeronautical, aerospace, and automobile industries. For ensuring the good quality of drilled holes in terms of least drilling damage and prolonged tool life, suitable selection of drill geometry and material, and drilling parameters-such as cutting speed and feed rate-are imperative in the drilling of CFRP plate. This study aims to evaluate the cutting performance of conventional two-flute twist drills made of cemented tungsten carbide YG6X (WC-6 wt % Co) for the dry drilling of the multidirectional T700 CFRP plate. The effects of varying cutting speed and tool wear pattern on the drilling performance are analyzed. The drilling performance is assessed in terms of hole quality by the qualitative and quantitative analysis of drilling-induced delamination and hole diameter. Furthermore, the correlation between the tool wear progression and the drilled hole quality is established. Through this assessment, a suitable set of drilling parameters, i.e., cutting speed of 9000 rpm and feed rate of 400 mm/min, is proposed for producing the best quality holes for multidirectional T700 CFRP plate.

Tool Wear and Surface Evaluation in Drilling Fly Ash Geopolymer Using HSS, HSS-Co, and HSS-TiN Cutting Tools

“…The wear happened at the drill corner due to subjected horizontal and vertical forces that occurred and from the spindle speed and contact length at the maximum. This is due to the higher friction that happened during the drilling process, contributing to the removal of small particles from the sharp edges of the cutting tools [ 25 ]. The cutting edges of the flank surface gradually wore as the drilling process progressed with no sign of flaking or chipping.…”

Critical Analysis of the Current Trends in Ensuring the Holes Quality when Drilling CFRP/Titanium Alloy Stacks

“…У найзагальнішому випадку параметри якості отворів можна розділити на: геометричну точність і точність форми, зокрема, діаметр отвору, відхилення від круглості і циліндричності та параметри морфології оброблених поверхонь. Діаметр отвору можна оцінити за відхиленням номінального діаметра отвору (E h ) [11]. У подальших дослідженнях ця класифікація була уточнена з погляду детальнішої інформації про коефіцієнт розшарування [12].…”