When CNC machining aluminum casting parts, there are several key factors to consider to ensure precision, quality, and tool longevity. Here are the main points to pay attention to:
Material Condition
1.1 Porosity
Cast aluminum often has internal porosity, which can affect machining accuracy. You may need to adjust tool paths or parameters to accommodate for this.
1.2 Surface Hardness
Some cast aluminum may have harder surfaces (due to cooling), requiring the use of more durable tools or different speeds.
Tool Selection
2.1 Coated Tools
Use appropriate tools with coatings (like TiAlN or DLC) to reduce tool wear and improve heat resistance.
2.2 Sharp Cutting Edges
Aluminum tends to stick to the tool, so sharp cutting edges and polished tools are recommended to reduce material buildup.
Cutting Speeds and Feeds
3.1 High Cutting Speed
Aluminum can handle higher cutting speeds, which helps prevent material from sticking to the tool.
3.2 Feed Rate
Use a moderate feed rate to balance between productivity and surface finish. Too slow a feed can lead to built-up edges on the tool.
Coolant and Lubrication
4.1 Coolant Use
Aluminum machining generates significant heat, so using adequate coolant or lubricant is essential to avoid tool wear and part deformation.
4.2 Flood Cooling
Consider flood cooling to improve surface finish and remove chips effectively.
