Deep hole drilling using tools with small diameters—Process analysis and process design

Investigations on the thermal workpiece distortion in MQL deep hole drilling of an aluminium cast alloy

“…Furthermore, the positive helix angle of the flutes assists the chip evacuation by facilitating a chip motion opposite to the feed direction, according to the principle of the Archimedes' screw. Contrariwise, the double-edged set-up leads to a reduced cross section of the flutes compared to the single-lip drilling tool [2,3].…”

“…The MQL method has the potential for decreasing the total energy consumption of the production process [3][4][5], considering the savings of procurement, service and recycling costs of the conventional coolant. Furthermore, the complete cooling lubricant unit and the corresponding relatively high energy consumption can be reduced [6][7][8].…”

Experimental investigations on single-lip deep hole drilling of superalloy Inconel 718 with small diameters

“…The guide pads at the circumference burnish the surface topography and thus excellent surface qualities are achievable. Subsequent manufacturing processes as reaming and honing become redundant using these deep hole drilling processes [2][3][4]. A major challenge in deep hole drilling, especially in gun drilling with small tool diameters, is the chip removal.…”

Comparatives Study of Non-Traditional Hole Machining Processes

“…The conventional method of hole creation produce certain machining defects which may lead to reduction of strength and fatigue life of components. Moreover, it may also generate micro-crack at the inner surface of the hole and in case of composite materials it may also lead to delamination [5]. Therefore, the conventional machining methods cannot be used for creation of holes in these materials in acceptable tolerance limits because of improved mechanical properties [6,7].…”