Objective: |
Minimize the scratches on the finished Femoral Head to maximize productivity by reducing the amount of hand polishing. |
Process: |
Finish the OD of a Femoral Heads using multiple wheels of decreasing grit size to achieve the desired finish and geometry. |
Component: |
Femoral Head |
Material: |
Cobalt Chrome |
Hardness: |
50 Rc |
Stock Removal: |
150 Microns (0.006") |
Coolant: |
Light Mineral Seal Base Oil |
Requirements: |
Roundness |
5 Microns (0.0002") |
|
Diametric Size |
15 Microns (0.0006") |
|
Finish |
0.015 um Ra (0.6 u" Ra) |
Machine Setup: |
3 Silicon Carbide Wheels - Turret Mounted |
Wheel Specification: |
GC320-50DV2S
GC800-50IV2S
GC1200-65FV2S |
Wheel Size: |
34 x 45 x 24MM (1.340" x 1.75" x .945") |
Results: |
Darmann implemented the use of wheels having coolant release holes that helped to keep the wheel/part interface free of debris. This new wheel design improved part quality and reduced process costs resulting in: |
| A 30% reduction in hand polishing |
| A 25% improvement in overall productivity |
| Improved quality and part appearance by reducing scratching on the surface of the part |
ISO 9001:2000 Registered