Materials for CNC Machined Parts
CNC machining (Computer Numerical Control machining) can process a wide range of materials, generally categorized into metals, plastics, and specialty materials.
I. Metal Materials
1. Aluminum Alloys
One of the most common materials for CNC machining.
Common Grades:
- 6061 Aluminum Alloy (Al-Mg-Si series)
- 7075 Aluminum Alloy (high-strength aerospace alloy)
- 5052 Aluminum Alloy (corrosion-resistant alloy)
Characteristics:
- Lightweight
- Easy to machine
- Good thermal conductivity
- Cost-effective
Applications:
- Automation equipment components
- UAV structures
- Electronic device housings
- Automotive parts
2. Stainless Steel
Common Grades:
- SUS304 (Austenitic stainless steel)
- SUS316 (Corrosion-resistant stainless steel)
- SUS303 (Free-machining stainless steel)
Characteristics:
- High strength
- Corrosion resistance
- Aesthetic surface finish
- More difficult to machine than aluminum
Applications:
- Medical equipment
- Food processing machinery
- Chemical equipment
- Marine applications
3. Carbon Steel
Common Grades:
- 45 Steel (medium carbon steel)
- A3 Steel (low carbon steel)
- Q235 (general structural carbon steel)
Characteristics:
- High strength
- Low cost
- Suitable for heat treatment
Applications:
- Mechanical structures
- Mold components
- Fixtures and tooling
4. Alloy Steel
Common Grades:
- 40Cr (chromium alloy structural steel)
- 42CrMo (chromium-molybdenum alloy steel)
- 20CrMnTi (gear steel)
Characteristics:
- High strength
- Good wear resistance
- Can be heat treated
Applications:
- Gears
- Shafts
- Heavy-duty machinery components
5. Copper and Copper Alloys
Common Grades:
- H62 Brass (copper-zinc alloy)
- T2 Copper (industrial pure copper)
- Beryllium Copper (high-strength copper alloy)
Characteristics:
- Excellent electrical conductivity
- Excellent thermal conductivity
- Corrosion-resistant
Applications:
- Electrodes
- Electrical connectors
- Heat sinks
6. Titanium Alloys
Common Grades:
- TC4 (Ti-6Al-4V)
Characteristics:
- High strength
- Lightweight
- Corrosion-resistant
- Difficult to machine
Applications:
- Aerospace
- Medical implants
- High-end sports equipment
II. Plastic Materials
1. ABS
Characteristics:
- Easy to machine
- Cost-effective
- Good surface finish
Applications:
- Product enclosures
- Prototyping
2. POM (Polyoxymethylene, Acetal)
Characteristics:
- Wear-resistant
- Low friction
- Dimensionally stable
Applications:
- Gears
- Sliding components
- Bushings
3. Nylon (PA)
Characteristics:
- High toughness
- Wear-resistant
Applications:
- Transmission components
- Industrial parts
4. Polycarbonate (PC)
Characteristics:
- Transparent
- Impact-resistant
Applications:
- Transparent covers
- Optical components
5. PEEK (Polyether Ether Ketone)
Characteristics:
- High-temperature resistance
- Chemical resistance
- High strength
Applications:
- Medical devices
- Aerospace components
- Semiconductor equipment
III. Specialty Materials
Magnesium Alloys
- Lighter than aluminum
- High machining efficiency
- Used in aerospace and UAV industries
Tool Steels
Common Grades:
- SKD11 (cold-work tool steel)
- H13 (hot-work tool steel)
Applications:
- Mold components
- Stamping dies
Engineering Ceramics
Common Materials:
- Zirconia (ZrO₂)
- Alumina (Al₂O₃)
Applications:
- Precision wear-resistant parts
- Medical components
Most Common CNC Machining Materials (by industrial prevalence)
- 6061 Aluminum Alloy
- SUS304 Stainless Steel
- ABS
- POM
- 45 Steel
- 7075 Aluminum Alloy
- 40Cr Alloy Steel
- PEEK
- TC4 Titanium Alloy
- Brass
