Molybdenum crucibles can be finely processed using CNC machine tools, and have significant advantages in high-end applications. The following is a detailed description of technical feasibility, process points, application cases and precautions:
- Technical feasibility
Material property adaptation
molybdenum has high hardness (HV200-300) and melting point (2620℃), CNC can achieve stable processing by properly selecting tools and parameters.
Ductility: Molybdenum’s ductility increases at high temperatures, which reduces the risk of machining cracks.
Processing accuracy
CNC can achieve a dimensional accuracy of ± 0.01mm, meeting the high-precision requirements of sapphire single crystal growth furnaces.
Ra0.4 μm or less can be achieved by optimizing cutting parameters.
- Key process parameters
| parameter | Recommended value | illustrate |
| Tool material | Carbide (such as K10 / K20 ) or CBN | Avoid high temperature softening to ensure cutting edge life |
| Cutting speed | 20-50 m/min | High-speed cutting can reduce cutting forces and deformation |
| Feed | 0.05-0.2 mm/rev | Small feed rate reduces surface roughness |
| Cutting depth | 0.1-0.5 mm | Avoid excessive cutting force causing cracks |
| Cooling method | Emulsion or oil-based cutting fluid | Prevent high temperature oxidation and lubricate the cutting area |
- Comparison with traditional technology
| index | CNC machining | Traditional machining (such as lathe/milling machine) |
| Dimensional accuracy | ± 0.01mm | ± 0.05mm |
| Surface roughness | Ra0.4 μm | Ra1.6 μm |
| Processing efficiency | Medium (limited by tool life) | high |
| applicability | Complex shapes and high precision requirements | Simple shape, low precision requirements |
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