Biomedical tools grinding – stainless steel

logo_cafro_sd090122 GCO case history - fluting biomedical tools

Biomedical tools grinding – stainless steel

Machine: Zaro Sharp Complet 2S (9 kW)
Coolant: Oil – Castrol Carecut ES-2
Pressure: 7 to 8 bar (100 to115 psi), centralized unit Comat + chiller
Tool: Bone milling tools
Stainless Steel: M340 (52 ÷ 54 HRC) corrosion resistant steel
Cafro Wheel: 1V1/15 125x12x6 Bore:20mm Grit B 126 Con. WH 110 Bond RCRC
Work piece: 10° taper end mill  –  5 teeth   –   Ø 23.5 mm – flute length 180 mm
Over All Length 230mm     –        R >> R straight helical
Operation 1: One pass fluting
Wheel speed: 26 m/sec (85 ft/sec)
Torque value: Machine indication 8.5 ÷ 9.5
Flute depth: Start:     5.5mm   –   End: 6.5mm
Work piece:

Wheel

speed m/sec.

Feedmm/min AbsorptionKw

Fluting Time

Minutes

(*)

26

28 10 to 11

37′

(*) Average values with competitor’s wheel, containing “W” type CBN
CAFRO Test

26

38 8.5 to 9.5

27’

Testimonial:
After a 30 pieces lot with the CAFRO wheel:
1. The CAFRO wheel left a radius of 0.2 to 0.3mm on the last piece, but didn’t show any wear: The original diameter value has been kept.
2. Dressing with an aluminum oxide stone where limited once on four pieces, while before with the competitor’s wheel, dressing was requested on every piece, and sometimes even frequently.
3. As result the competitor wheel were worn out after 100 pieces. With the CAFRO wheel it was estimated to produce at least five times more pieces.
4. Operation time has been reduced of 35 %

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