Nachi SG Series Drills

Manufacturer: Nachi-fujikoshi corp
Model: SG Series: SG-ESR/ESS

Outline

Longest service life for high-speed steel (HSS) drills
Powder HSS with SG Coating and the tool life is 2-3 times of conventional drills.
Stable and high precision drilling
Extremely precise positioning and Stable drilled hole diameter.
Stable drilling is realized for a wide range of work materials
The SG-ESR drill realizes stable machining for a wide range of work materials with improved chip breaking and chip removal.
The SG-ESS drill newly supports even smaller diameters (Ø0.5 to Ø1) that expands applications.

Features

Flute Geometry of SG-ESR
SG-ESR DrillsFrom carbon steel, alloy steel to SUS304
SG-ESS Drills

Suitable for high hardness materials such as:
Pre-hardened steels
Heat-treated steels
Enables good chip curl and separation

SG Coating
Specialized Film for Drill with Fine Structure
Fine and multiple layer structure improve rigidity and wear-resistance

Fibrous precise films can control fatigue crack propagation and prevent the big damage to coating film

Performance

Drilling of S50C SCM440 SGESR
Tool: 6.8 mm
Cutting Speed: 40 m/min
Feed: 330 mm/min (0.18 mm/rev)
Work Material: S50C (180HB)
Hole Depth: 20 mm Through Hole
Coolant: Water-soluble
Tool: 6.8 mm
Cutting Speed: 20 m/min
Feed: 115 mm/min (0.12 mm/rev)
Work Material: SC440 (32HRC)
Hole Depth: 20 mm Through Hole
Coolant: Water-soluble
Drilling of Stainless steels (SUS304) SGESR
Tool: 6.8 mm
Cutting Speed: 12 m/min
Feed: 77 mm/min (0.14 mm/rev)
Work Material: SUS304
Hole Depth: 20 mm Through Hole
Coolant: Water-soluble
Compare the difference of chip separation
Tool life (SS400 SUS304)
SS400

Tool: 6 mm
Cutting Speed: 40 m/min
Feed: 400 mm/min (0.19 mm/rev)
Work Material: SS400
Hole Depth: 19 mm
Coolant: Emulsion
SUS304

Tool: 12 mm
Cutting Speed: 12 m/min
Feed: 80 mm/min (0.25 mm/rev)
Work Material: SUS304
Hole Depth: 28 mm
Coolant: Emulsion
S50C

Tool: 6 mm
Cutting Speed: Vc 40 m/min (2100 min⁻¹)
Feed: 420 mm/min (0.2 mm/rev)
Work Material: S50C (180HB)
Hole Depth: 19 mm Through Hole
Coolant: Emulsion
SCM440H (32HRC)

Tool: 2 mm
Cutting Speed: Vc 28 m/min (4450 min⁻¹)
Feed: 400 mm/min (0.09 mm/rev)
Work Material: SC440 (32 HRC)
Hole Depth: 6 mm Blind Hole
Coolant: Emulsion
Oversize – Comparison in each feed rate

Tool: ⌀6 mm
Cutting Speed: Vc 40 m/min
Work Material: S50C (180HB)
Hole Depth: 19 mm Through Hole
Coolant: Emulsion
Max Oversize: 30 μm (SGESR)
Appication example : Tool life comparison SGESS
Tool Life Comparison – Ø0.5 mm

Tool: 0.5 mm
Cutting Speed: 8 m/min
Feed: 51 mm/min (0.01 mm/rev)
Work Material: SUS304
Hole Depth: 1.5 mm Blind Hole (0.25 mm Step)
Coolant: Water-soluble
Tool Life Comparison – Ø0.9 mm

Tool: 0.99 mm
Cutting Speed: 10 m/min
Feed: 64 mm/min (0.02 mm/rev)
Work Material: SUS304
Hole Depth: 3 mm Blind Hole (0.5 mm Step)
Coolant: Water-soluble
Tool Life Comparison – Ø0.5 mm

Tool: 0.5 mm
Cutting Speed: 25 m/min
Feed: 320 mm/min (0.02 mm/rev)
Work Material: S50C (180HB)
Hole Depth: 1.5 mm Blind Hole
Coolant: Water-soluble
Tool Wear Comparison After 8320 Holes – Ø0.9 mm

Tool: 0.99 mm
Cutting Speed: 30 m/min
Feed: 250 mm/min (0.03 mm/rev)
Work Material: S50C (180HB)
Hole Depth: 3 mm Blind Hole
Coolant: Water-soluble