Twist Drills TRIZ Cases

A negative rake shoulder edge with reduced honing helps prevent welding, lower burrs, and extend drill life in through-hole drilling.

A curved and straight thinning cutting edge improves chip flow while suppressing chip melting and adhesion without sacrificing edge strength.

Vertical and horizontal discharge chutes guide chips into spiral flow, reducing winding, heat buildup, and hole roughness during drilling.

Three converging cutting edges with localized point thinning improve centering, chip flow, and drill stability in hard-material flat drilling.

A multi-edge conical centering section replaces the chisel edge to suppress drilling vibration, improve hole quality, and reduce tool wear.

Variable-width honing surfaces reduce chip-collision damage at flute boundaries while preserving drill rigidity and machining accuracy.

Controlled ridgeline spacing and segmented chisel regions improve hole accuracy and positional tolerance without sacrificing drill strength.

A pressure-responsive flow control element redirects coolant to a blocked flute, clearing jammed chips and sustaining drilling in difficult materials.

Variable-width chamfers reduce heat at the borehole tip while maintaining drill guidance and chip removal in CFRP machining.

Symmetric micro-reinforced center drills and reamers balance cutting forces, reduce wear, and improve drilling accuracy in high-hardness materials.

A chamfered corner and locally reduced rake angle strengthen the drill outer edge to cut superalloys with less chipping and better hole quality.

A drill tip thinning angle of 85°-95° guides chips axially near the center, cutting friction, machining forces, and grinding cost.

A welded or brazed unitary cutting head boosts drilling speed in hard materials while improving attachment strength and tool life.

Different cutting-edge angles improve workpiece engagement, reduce wear, and speed drilling in hard materials like concrete and metal.

A separate sleeve with helical flutes creates a distinct energy path, reducing stress on the body and shank while improving drilling speed and life.

Three cutting edges and axial chip passages create a rectilinear drilling profile while improving chip evacuation and flat shoulder machining.

A radially increasing flank angle cuts friction at the cutting corner while preserving edge stability for longer tool life and better bore quality.

Interrupted cutting edges and extended chip grooves enable high-feed drilling while preventing chip jamming and CFRP delamination.

A segmented gash with curved and straight portions improves chip curling, prevents clogging, and lowers cutting resistance in a three-flute drill.

A radially increasing flank angle cuts corner friction and wear while preserving edge strength for longer drill life and better bore quality.

An axially set-back support collar stabilizes bore machining during interrupted or angled exits, improving hole accuracy while reducing wear.

An added outer cutting edge projects beyond the main corner to spread radial and axial load, reducing wear and extending drill life.

A circular arc groove between the thinning face and gash face helps chips curl and clear the flute without clogging near the chisel.

Curved main cutting edges slice steel more effectively, reducing outer-edge wear, friction, and chip transport issues during hard-material drilling.

Multi-surface drill tip geometry reduces slippage, heat, and tissue trauma while enabling stable bone entry at varying angles.

Balanced spiral bodies and stepped alloy cutting surfaces reduce centrifugal damage, enabling faster drilling with stable precision and longer tool life.

Varying three flank clearance angles cuts resistance, limits burrs, and keeps drilling stable for more precise holes.

A single asymmetric margin and clearance layout improves drill straight running, chip discharge, and biting while reducing vibration and cutting resistance.

Curved transitions in the drill cutting edge reduce stress concentration, radial loads, chatter, and hole diameter loss during machining.

A two-angle drill point improves self-centering on uneven or non-perpendicular surfaces while reducing lateral deflection and breakage.

R web thinning and an 80°-100° margin interval let the minor margin engage earlier, improving drilling precision and chip evacuation.

Offset chisel edges and relief faces improve drill centering and rigidity while reducing torque and burrs in precision hole making.

A stepped connection surface between the flute and end face cuts ridgeline stress, prevents chipping, and preserves chip discharge.

A concave-to-convex cutting edge and groove wall shape improves chip curling while reducing outer-edge chipping, wear, and breakage.

Drilling the powder-compact green body with a circular-arc drill edge lowers thrust load, suppresses hole chipping, and improves productivity.

Drilling the powder-compact green body before sintering with a circular-arc drill edge cuts resistance, suppresses hole-edge chipping, and improves productivity.

Different tip angles and a pilot tip help one drill bit cut brick, metal, and concrete faster while improving durability.

Different honing on inner and outer cutting edges prevents cracking while preserving biting performance in rotary machining.

A conical centering section replaces the chisel edge to suppress chatter, improve hole roundness, and extend drill life.

A tapered web reduces thickness at the cutting tip to improve chip removal while maintaining structural strength near the shank.

Optimized chisel edge inclination angles fragment chips to prevent clogging in deep holes drilled with thicker web thicknesses.

Inclined round chamfers on twist drill lands create gaps that reduce friction and vibration during deep-hole drilling.

Differentiated point angles prevent chip compaction at the center while maintaining structural stability at the main edges.