CNC milling on metals

CNC milling, or computer numerical control milling, is a metalworking process that uses a numerical control machine to remove excess material from a metal surface.

In this article we see together the technical characteristics to be known for working on metal alloys, the main sectors of application and the possible processes.

Areas of application of CNC milling on metals

The CNC milling machine is among the most used machines both industrially and artisanally. In fact, this type of machine allows different machining on a wide range of materials. 

The sectors where the CNC milling machine is most widely used are:

• food sector;
• thermoforming sector;
• production of sewing machines;
• medical, electromedical sector;
• machinery for sanitisation;
• aerospace sector;
• ceramic sector and marble processing.

In addition to these main sectors, the milling machine is also suitable for crafts and hobby work, which make this machine very sought after. 

In fact, thanks to the versatility of processing and the ability to work with great precision, the raw material can be modified in a short time and at low prices, through online CNC milling services.

Types of metals suitable for CNC milling

The CNC milling machine is commonly used for the processing of metals, which are processed according to the specifications of the project thanks to the control computer, which monitors the processing and guarantees its precision.

However, each material has different processing needs based on its characteristics (hardness, strength, thickness, etc.). 

In the case of metal materials, the CNC milling machine allows great flexibility in terms of materials suitable for processing.

To date, the following materials can be processed without problems:

• steel
• stainless steel
• alloyed steel
• austenitic steel
• aluminium
• anodised aluminium
• brass
• bronze
• cast iron
• tempered steels
• carbides
• copper
• precious metals
• coated metals

These are just some of the types of metal suitable for CNC milling. There are other types on the market, however it is important to know their technical composition to ensure their suitability for this type of processing. 

For example: coolant is usually used during milling, however its composition is not suitable for working all types of metals, putting the machining and the machine itself at risk. 

Types of metalworking

The CNC milling process can be used for a wide range of metalworking operations. Here are some common examples:

• Face milling: A flat face milling cutter is used to create a flat surface on the metal. This processing is often used to obtain reference surfaces or to level a surface.
• Milling for shaping: This process is used to create complex shapes and contours on the metal. Using special milling machines, you can create detailed three-dimensional shapes.
• Milling for drilling: Through the use of specific milling machines, it is possible to create holes of different sizes and shapes in the metal. This processing is often used to create holes for bolts, screws or to make openings for mechanical parts.
• Groove Milling: This machining is used to create linear grooves or T-shaped grooves on the metal. The grooves can be used for inserting gaskets, wrenches, or other components.
• Thread milling: Through the use of thread milling cutters, it is possible to create internal or external threads on metal parts. This process is often used to create threaded connections for screws, nuts, or other parts.
• Milling of inclined surfaces: With an adjustable milling head, it is possible to work inclined surfaces on metal parts. This can be used to create angles or inclined surfaces to join the parts.
• Milling of grooves and pockets: Using special milling cutters, you can create grooves or pockets on a metal surface. This can be useful for inserting components or for creating empty spaces within a part.

These are just a few examples of the machining that can be performed by CNC milling on metals. The flexibility and precision offered by the CNC machine allows you to create a wide range of shapes and details on metal materials. 

Conclusions 

In general, the processes and types of materials that can be used may depend on the characteristics of the machine itself, which may have different capacities depending on the number of axes, power, and other parameters to be considered before starting the process.

Therefore, before starting a new project, it is important to know the composition of the materials, the technical characteristics of the machine and have a well-defined project in order to avoid errors during processing.