1. Aluminum Alloy

Properties: Lightweight (density 2.7 g/cm³), corrosion-resistant, easy to machine. Heat treatment (e.g., T6) enhances strength, achieving tensile strength up to 310 MPa.
Typical Components:
Aerospace: Aircraft skins, brackets (over 30% weight reduction, improved fuel efficiency).
Consumer Electronics: Laptop casings, smartphone midframes (anodized for matte finishes).
Automotive: Engine blocks, wheel hubs (superior heat dissipation compared to cast iron, 50% weight reduction).

2. Stainless Steel

Characteristics: Chromium content ≥10.5%, exceptional corrosion resistance (e.g., 304/316L grades), high strength (tensile strength 520-1030 MPa).
Typical Applications:
Medical devices: Surgical instruments, implants (316L medical-grade stainless steel, compliant with ISO 5832-1 biocompatibility standards).
Food processing machinery: Brewing equipment, piping (304 grade resists chloride corrosion, FDA certified).
Architectural finishes: Curtain wall fittings, handrails (mirror-polished finish, surface roughness Ra ≤ 0.05μm).

3. Titanium Alloys

Characteristics: High strength (strength-to-density ratio twice that of steel), high-temperature resistance (stable below 600°C), excellent biocompatibility.
Typical Applications:
Aerospace: Engine blades, landing gear (TC4 titanium alloy, superior fatigue resistance compared to aluminum alloys).
Medical field: Artificial joints, dental implants (Ti6Al4V ELI grade, adjustable porosity promotes osseointegration).
High-end sports: Bicycle frames, golf club heads (40% improved shock absorption, 60% lighter than steel components).

4. Copper Alloys

Characteristics: Exceptional electrical conductivity (pure copper conductivity ≥98% IACS), superior thermal conductivity (brass thermal conductivity 108W/(m·K)), high wear resistance.
Typical Applications:
Power Electronics: Terminal blocks, heat sinks (C1100 pure copper, contact resistance ≤0.5mΩ).
Automotive Industry: Bearing bushings, gears (C95400 aluminum bronze, hardness up to 30 HRC, 3x extended wear life).
Decorative Applications: Watch components, sculptures (C26000 brass, premium surface finishes via wire-brushing or gold plating).

5. Magnesium Alloys

Characteristics: Lightest structural metal (density 1.74 g/cm³), high stiffness (elastic modulus 45 GPa), excellent vibration damping properties.
Typical Components:
3C Products: Laptop casings, camera frames (AZ91D magnesium alloy, superior electromagnetic shielding compared to aluminum alloys).
Automotive lightweighting: Dashboard brackets, seat frames (significant weight reduction—every 100kg reduction lowers fuel consumption by 0.3L/100km).
Sports equipment: Snowboards, bicycle hubs (25% improved impact absorption, reducing sports injury risk).

6. Tool Steel

Characteristics: High hardness (HRC 58-65), red hardness (hardness retention ≥50HRC at 600°C), strong wear resistance.
Typical Applications:
Mold Manufacturing: Injection molds, die-casting molds (H13 steel, thermal fatigue life exceeding 100,000 cycles).
Cutting Tools: Drills, milling cutters (M42 high-speed steel, containing 8% cobalt, cutting speed 50% higher than standard steel).
Measuring Tools: Calipers, micrometers (GCr15 bearing steel, dimensional stability ≤1μm/year).

Conclusion

CNC machining achieves comprehensive material coverage—from lightweight aluminum alloys to high-temperature titanium alloys, and from highly conductive copper alloys to ultra-hard tool steels—through precise control of tool paths and cutting parameters.
Whether in the aerospace sector pursuing ultimate performance or the consumer electronics industry prioritizing cost-effectiveness, CNC-machined metal parts meet stringent manufacturing demands through material selection and process optimization.