Drilling studies of an Al2O3-Al metal matrix composite

Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

“…These forces and motions are necessary for material removal and thus cutting tool wear is an inevitable production problem for manufacturing industries. 149 Two major types of gradual tool wear in metal cutting have been reported, namely, temperature activated diffusive wear or mechanically activated wear in terms of adhesive, abrasive, and/or fatigue mechanisms. The particular type of wear which prevails in a specific machining operation depends on the cutting-tool material, on the workpiece material being machined, and on the cutting conditions themselves.…”

The drilling of Al/SiCp metal–matrix composites. Part II: workpiece surface integrity

“…That is why the solid carbide drill which is harder than the TiN coated HSS and HSS drills according to Table 1 in [16] and Table 2 in [2], showed better surface finish results.…”

“…For a given width and depth of cut, the contact area between the tool and workpiece is proportional to the feed rate. This is the basis of rough machining in that the use of high feed rates produce maximum material removal and minimum tool wear [1,16]. The extent of the wear reduced, therefore, as the cutting time decreased with increased feed rate.…”

“…Abrasive wear involves the removal of the tool material by a scoring action of hard phase inclusions in the chip [16]. Another important consideration in abrasive wear is the area and time of contact between the cutting tool and workpiece material [16,17]. Assuming that a unit volume of material is to be removed, the area swept by the cutting edge is the product of the width of cut and feed rate.…”

“…Abrasion is the primary mode of tool wear when drilling PMMCs, as the cutting edge of the tool encounters the reinforcing particles in the aluminum [11]. Abrasive wear involves the removal of the tool material by a scoring action of hard phase inclusions in the chip [16]. Another important consideration in abrasive wear is the area and time of contact between the cutting tool and workpiece material [16,17].…”