CNC machining of aluminum is a method of precision machining of aluminum materials using computer numerical control technology.

This technology is capable of high precision and high efficiency machining, and is widely used in machinery, aviation, automobiles, electronic products and other fields.

Below are the basic steps of CNC machining aluminum and the key points to pay attention to:

CNC machining aluminum

Precautions for CNC machining aluminum

When performing CNC machining of aluminum, you need to pay attention to the following aspects:

Machine tool condition

CNC machine tools are in good working condition, regular maintenance and repair to ensure machining accuracy and stability.

Material cooling

Aluminum alloy material generates heat during machining, take appropriate cooling measures, use coolant or cooling devices to reduce temperature and extend tool life.

Machining process

According to the shape, size and material characteristics of the machined parts, select the appropriate machining process, such as milling, turning, drilling, etc., and rationally arrange the machining sequence.

Parameter setting

Set the parameters of the CNC machine tool, cutting speed, feed rate, spindle speed, etc., to adapt to different machining conditions and material characteristics.

Tool selection

According to the machining requirements and material characteristics, select the appropriate tool material and geometric parameters, such as carbide, ceramic or coated tools, etc., in order to improve machining efficiency and quality.

Stress control

During machining, measures should be taken to control the internal stress of the workpiece to avoid cracks or fractures caused by stress concentration.

Safe Operation

Follow the safe operation procedures of CNC machining to ensure the safety of operators and avoid accidents.

CNC machining aluminum applications

Automotive industry

Used in the manufacture of automotive parts, body structures, etc. to meet lightweight and performance requirements.


Used to manufacture parts for spacecraft such as aircraft, rockets, satellites, etc. to meet the requirements of high precision and light weight.

Electrical Appliances

Used for manufacturing electronic equipment shells, circuit boards, etc. to meet the requirements of complex shapes and high precision.

Sports Industry

Used for manufacturing sports equipment and accessories, such as golf clubs, skis, etc., to meet the requirements of lightweight and strength.

Tool selection for CNC machining aluminum

Cutting tool materials

Carbide tools and multi-flute inserts are often the preferred tool materials due to their high hardness and wear resistance. For more demanding machining conditions, ceramic or coated tools are available.

Geometric parameters

The geometric parameters of the tool (e.g. radius, angle, etc.) should be selected according to the shape and size of the part to be machined to ensure machining efficiency and quality.


The structure of the tool (e.g. monolithic, modular, etc.) should be selected according to the machining requirements and economy for easy replacement and maintenance.

CNC machining aluminum machining skills

When CNC machining aluminum, the following machining techniques can be taken to improve machining efficiency and quality.

Reasonable arrangement of machining process

According to the shape and size of the machined parts, arrange the machining sequence reasonably, give priority to rough machining, and then finish machining, in order to reduce the machining time and improve the machining efficiency.

Use proper operation method

Master the correct operating techniques, such as using appropriate cutting parameters, reasonable selection of tool paths, etc., in order to improve machining quality and efficiency.

Avoid machining deformation

Since aluminum alloy material is prone to deformation during machining, measures should be taken to control the machining force and thermal deformation, such as the use of coolant and reasonable selection of cutting parameters.

Tool path strategy optimization

Optimizing the tool path can reduce machining time and improve machining efficiency. For example, strategies such as using spiral feeds and avoiding unnecessary empty strokes can reduce machining time.

By adopting these machining techniques, the efficiency and quality of CNC machining aluminum can be improved, while extending tool life.

Machining Equipment for CNC Machining Aluminum

When CNC machining aluminum, you need to choose the right CNC machine and equipment. Here are some key points:

Selecting the right CNC machine

According to the shape, size and material properties of the machined parts, choose the appropriate CNC machine tool. For example, for complex shaped parts, a 5-axis CNC machine may be required; for simple shaped parts, a 3-axis CNC machine may be sufficient.

Fixture Design

Fixture is a device used to fix the processed parts, and its design should ensure the stability and accuracy of the parts in the machining process. The fixture should have good positioning accuracy and clamping force and be easy to operate.

Machining operation

Operators should be familiar with the basic principles and operating methods of CNC machining, and understand the functions and characteristics of CNC machine tools. They also need to be able to set and adjust the parameters of the CNC machine correctly to adapt to different machining conditions.

Quality Inspection

During the machining process, quality inspection should be carried out regularly to ensure that the machined parts meet the design requirements and quality standards. This can be done by measuring tools and instruments, such as calipers, micrometers, CMMs, etc.

The accuracy and efficiency of CNC machining aluminum can be ensured by choosing the right CNC machine, fixture design, machining operation and quality inspection.

Advantages of CNC machining aluminum

High Precision

CNC machining can achieve extremely high machining accuracy, usually within ± 0.01mm, to meet the strict size and tolerance requirements.

Ability to process complex shapes

CNC machining can easily process a variety of complex shapes, such as curved surfaces, contours, etc., without the need for complex manual operations.

High Efficiency

As CNC machining adopts automated operation, it can greatly shorten the production cycle and improve productivity. At the same time, through the optimization of cutting parameters and tool paths, can further improve the processing efficiency.

Resource Saving

CNC machining of aluminum reduces material waste as it allows precise control over the amount of material removed. In addition, due to the high degree of automation of the machining process, labor costs and energy consumption can be reduced.

Flexibility and customization

CNC machining can be easily adapted to small-lot and multi-variety production to meet the demand for personalization and customization. By modifying the CNC program, the machining process can be quickly adjusted to adapt to different product design and production requirements.

Process flow of CNC machining aluminum

Design and Drawing

Before machining can begin, detailed design and drafting work is first required. This includes creating a three-dimensional model of the part, developing the machining process route, and determining the required tools and parameters. These tasks are easily accomplished using CAD/CAM software, which generates the appropriate CNC program.

Material preparation and clamping

According to the requirements of the design drawings, select the appropriate aluminum alloy material and carry out the necessary pre-treatment, such as cutting and deburring. Then, use appropriate fixtures to fix the material on the CNC machine tool to ensure stability and precision during machining. The design of the fixture should take into account the force and machining allowance during the machining process.

Milling Processing

Use CNC milling machine to process aluminum alloy material. According to the shape and size requirements of the parts, select the appropriate milling cutter and cutting parameters. The motion trajectory of the milling head is controlled through programming, and the cutting is carried out in accordance with the predetermined path. During the milling process, care should be taken to control the cutting speed and feed rate to avoid overheating and tool wear.

Drilling Processing

For the parts that need to be drilled, use CNC drilling machine for processing. Select the appropriate drill bit and cutting parameters, and drill holes according to the size and position on the design drawings. In the drilling process, a stable cutting force should be maintained to avoid drill bit breakage or hole wall breakage.

Surface treatment methods for CNC machining aluminum

High-gloss milling/high-gloss cutting

Using high-precision CNC machining equipment to cut the detail parts of aluminum or aluminum alloy material parts to form a local high-gloss area to increase the aesthetics of the product.


Treatment of metal surfaces through the impact of high-speed sand flow, including cleaning and roughening the metal surface, improving the cleanliness and roughness of the part surface and enhancing the adhesion of the coating.


Through mechanical, chemical or electrochemical action, reduce the roughness of the surface of the workpiece, obtain a bright, flat surface, mainly used to improve the appearance of the product.


Through the stretching process to make the metal surface to form a line-like texture, increase the decorative and feel of the product.


Forms a layer of oxide film on the surface of aluminum products to improve the wear resistance, corrosion resistance and insulation of the surface, and at the same time can change the color and appearance of the surface.

Spray Coating

By spraying paint onto the surface of the workpiece using a spray gun, a protective or decorative coating is formed to improve the wear and corrosion resistance of the product.


Plating a layer of metal or alloy on the surface of aluminum products through the use of electrolytic technology to improve the hardness, wear resistance and corrosion resistance of the surface.

Laser marking treatment

Using laser beams to engrave markings such as text, patterns and logos on the surface of aluminum products to improve the appearance quality and anti-counterfeiting ability of the products.

Anti-corrosion treatment

Prevent corrosion on the surface of aluminum parts by applying a protective layer or using an anti-corrosion agent. Common anti-corrosion treatments include electroplating, spraying and anodizing.

Coating treatment

Special paints or coatings are applied to the surface of aluminum parts to provide additional protection and decorative effects. Common coating treatments include spraying, powder coating and electrophoretic coating.

Oxidation treatment

Forming an oxide layer on the surface of aluminum parts to improve corrosion resistance and hardness, as well as to improve the appearance, common oxidation treatment methods include anodic oxidation and sulfuric acid oxidation.

Coating treatment

Deposits a thin film of metal or other materials onto the surface of aluminum parts to provide additional protection and improve appearance. Common coating treatments include chrome plating, nickel plating, and zinc plating.

Paint treatment

Paints are applied to the surface of aluminum parts to provide protection and a decorative effect, changing the color, gloss and texture of the part.

Machcncmaster CNC machining aluminum provides technical support from the design stage to ensure that the final product can meet the personalized needs of customers and provide a one -stop solution.

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