Flow Drilling - Friction Drilling - Form Drilling

Friction drilling, also known as thermal drilling, flow drilling, formdrilling, or friction stir drilling, is a nontraditional hole-making method.The heat generated from friction between a rotating conical tool and thework-piece is used to soften the work-material and penetrate a hole.Figure.1 shows a schematic illustration of the five steps in frictiondrilling. 

The tip of the conical tool approaches and contacts the work-piece. The tool tip, like the web center in twist drill,indents into the work-piece and supports the drill in both the radial andaxial directions. Friction on the contact surface, created from axial forceand relative angular velocity between tool and Work-piece, produces heatand softens the work-piece material.As the tool is extruded into the work-piece.

Itinitially pushes the softened work-material sideward and upward. Withthe work-piece material heated and softened the tool is able to piercethrough the work-piece. Once the tool penetratesthe work-piece.  the tool moves further forward topush aside more work-piece material and form the bushing using thecylindrical part of the tool...

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