The Complete Guide To 5-Axis CNC Machining

 

 

Table of Contents

 1.What is a 5-Axis CNC Machine?
 2.Types of 5-Axis CNC Machines
 3.5-Axis CNC Machining vs. 3+2 Machining vs. 4+1 Machining
 4.Configuration Options for 5-Axis Machining Centers
 5.Why Choose 5-Axis CNC Machining?
 6.Programming 5-Axis CNC Machines
 7.Key Steps in 5-Axis CNC Machining
 8.Cutting Tools for CNC Machining
 9.Custom 5-Axis CNC Machining Services

 

 

1.What is a five-axis CNC machine?

A five-axis CNC machine is a high-precision device that can perform tool operations simultaneously through five axes, suitable for manufacturing parts with complex shapes and fine surface finishes. Compared with traditional three-axis machine tools, five-axis machine tools provide higher degrees of freedom and can process in multiple directions simultaneously, improving processing efficiency and accuracy.
In addition to the X, Y, and Z axes, five-axis machines also include A, B, or C axes. These additional axes control the rotation and tilt of the worktable, allowing the workpiece to be cut at multiple angles. This allows the processing of complex geometries, especially precise side cutting when rotating 360 degrees. The tool can swing on the stationary workpiece, or the worktable can be tilted to the desired angle to meet a variety of complex processing needs. The type and processing method of five-axis machine tools vary according to the specific configuration and application requirements.

 

2.Types of five-axis CNC machine tools

To meet different market needs, CNC equipment manufacturers have designed a variety of five-axis CNC machine tools. They are mainly distinguished by the rotation of the worktable or the movement of the tool in different directions. The following are five common types of five-axis CNC machine tools:

 

(1) Dual-pivot spindle head type

This type of machine tool directly controls the direction of the tool axis through two rotating coordinates, providing high-precision multi-angle processing capabilities.
 

(2) Pitch swing head type

In this type, the two coordinate axes are located above the tool, but the rotation axis is not perpendicular to the linear axis, which is suitable for the processing of complex shapes.
 

(3) Double turntable type

The double turntable machine tool controls the rotation of space through two rotating coordinates, and can perform precise cutting in multiple axes at the same time.
 

(4) Pitch table type

This type of machine tool places two coordinate axes on the worktable, and the rotation axis is not perpendicular to the linear axis, which is suitable for multi-angle and complex geometric processing.
 

(5) Rotary table + rotating spindle head type

This machine tool applies two rotating coordinates to the tool and workpiece respectively, providing higher flexibility and precision, and can achieve complex three-dimensional processing.

 

3.5-axis CNC machining vs 3+2 machining vs 4+1 machining

 

Five-axis machining = five-sided machining?
Five-axis machining and five-sided machining are two different machining methods. Five-axis machining involves five axes moving simultaneously and is suitable for machining more complex parts, while five-sided machining (3+2 machining) is based on three axes and adds rotation and tilt axes to machine five faces in a single setup.

3+2-axis CNC machining
3+2 machining, or five-sided machining, uses three linear axes, plus one rotation axis and one tilt axis. This method can machine five sides of a part in a single setup, using the additional two axes to reposition the workpiece.

4+1-axis CNC machining
4+1 machining uses a five-axis machine tool, but fixes one rotation or tilt axis. Four axes work simultaneously, and usually only one axis is used for positioning. It is more powerful than 3+2 machining, but still not completely equivalent to 5-axis machining.

Full 5-axis CNC machining
Full 5-axis machining is five axes working simultaneously, including three linear axes and two rotary axes, which can perform more complex shapes and precision machining. Suitable for parts that require high precision and complex geometry, such as hook surface, special shape and hollow machining.

Five-axis machining is suitable for complex and precise machining tasks, while five-sided machining is more of an expansion on the basis of three axes. Five-axis machine tool programming is more complex than three-axis, and the tool geometry design is more sophisticated.

 

4.Configuration Types of 5-Axis Machining Centers

Common 5-axis CNC machine configuration types include table-table, head-table, head-head, and other combinations.
Table-table configuration
This configuration is often referred to as a trunnion table machine, and features two rotary axes integrated into the table, while the head of the machine remains stationary. The workpiece is positioned by rotating the table. This configuration is based on a traditional three-axis CNC machine that uses two rotary axes to adjust the workpiece orientation. The trunnion configuration provides excellent undercutting capabilities, a larger workspace, and higher speed and durability for high-precision and large-scale machining.
Head-table configuration
In this configuration, the head of the machine performs all rotary motion, while the table remains stationary. The head can be rotated or tilted at multiple angles to complete complex machining tasks. This configuration is very effective for machining workpieces with complex shapes and tight spaces, especially for applications that require high-precision machining.
Head-head configuration
A head-head machine is a more complex configuration where both heads of the machine can rotate. This machine provides more degrees of freedom than other configurations, enabling more complex machining operations. Suitable for machining tasks that require cutting at multiple angles simultaneously. The head-head configuration is particularly suitable for machining delicate parts and complex geometries, and provides greater stability and precision.

 

5.Why use 5-axis CNC machining?

5-axis CNC machine tools have significant advantages in multiple industries, especially in the medical, aerospace and automotive fields, capable of processing complex shapes, high precision and smooth surfaces.
Unlike traditional 3-axis machine tools, 5-axis CNC machining can complete multi-faceted cutting, drilling and tapping simultaneously in one setup, greatly saving time and improving efficiency. It can handle complex geometries that traditional machine tools cannot complete, reducing the need for workpiece repositioning, thus improving machining accuracy and surface quality. The high precision and stability of 5-axis CNC machines make them ideal for mass production and high-standard manufacturing, especially in industries that require high tolerances and fine contours. By reducing human intervention, 5-axis machining improves production efficiency and processing quality and is an indispensable tool for modern manufacturing.
Advantages of 5-axis CNC machining
 Shorten delivery time and improve production efficiency
 Improve machining accuracy and quality
 Enable machining of complex geometries and details
 Enhance production capacity
 Replace multiple machining equipment
 Reduce potential errors in the machining process
 Extend cutting tool life through automatic tool selection and optimized cutting speed
 Reduce vibration and achieve higher surface finish

 

6.Programming 5-axis CNC machines
G-code programming for 5-axis CNC machines begins with a model designed in CAD software, which is then converted into an algorithm that includes spindle speed, feed rate, and tool motion. Compared with traditional 3-axis machines, 5-axis machining requires controlling different angles of the tool and the tilt path of the table.

Programming methods
In 5-axis programming, there are two ways to control rotational motion: using rotation angles or tool vectors. Tool vectors specify rotation or tilt angles through X, Y, and Z axis commands, which are flexible and allow programming to be shared between different machines without the need for specific axis annotations (A, B, and C axes). Commonly used software includes Autodesk, Mastercam, Siemens NX, PowerMill, and Edgecam.

5-axis CNC machining points
Cutting rate: Ensure that the machine tool can effectively control the cutting path.
Look-ahead function: Improve calculation efficiency and ensure smooth processing.
Tool holder system: Choose a suitable tool holder to avoid tool vibration during processing.
Feed rate: Reasonably control feed and tool speed to extend tool life.
Coolant: Use appropriate coolant and lubricant, prevent overheating, and remove waste.
Tool path simulation: Perform tool path simulation before processing to ensure accurate processing.

 

7.Key Steps When Performing 5-Axis CNC Machining

Ensure Processing Rate Matching
Ensure that the CNC machine has sufficient processing rate to effectively control the cutting tool path indicated by the G-code and avoid any delays or errors during the machining process.

Enable Look-Ahead
Enabling the look-ahead function helps the CNC machine calculate the path in advance for a smoother and more efficient machining process.

Choose the Right Tool Holder System
Choosing a stable tool holder system is crucial to ensure that the tool does not vibrate during the machining process, thereby ensuring machining quality and accuracy.

Control Feed Rate and Tool Speed
Precisely controlling the feed rate can increase tool life. Properly adjusting the tool speed to suit the machining needs of different materials can help extend the tool life.

Use the Right Coolant
Use the right coolant (such as lubricant or water jet system) to reduce the heat of the spindle, avoid overheating of the tool, ensure stability during the cutting process, and clean up the waste material in the cutting area.

Tool Path Simulation
Before actual machining, use simulation software to check the tool path to ensure that all paths have been planned correctly and verify the results to reduce errors and unnecessary losses.

 

8.Cutting tools for CNC machining
5-axis CNC machines use similar cutting tool materials as 3-axis machines, but have significantly improved tool holding stations and tool changing capabilities. The 5-axis machine tool is equipped with an automatic workpiece or pallet changing system, which reduces manual intervention and improves the efficiency of multi-variety and small batch production. Automatic tool change magazines typically contain 60 to 120 tool stations and are suitable for complex designs.

Cutting tool material selection
Choosing the right tool material depends on strength, thermal conductivity and friction coefficient. Generally, the strength of the tool material should be 40% to 60% higher than the processing material. Common tool materials include:

Carbon steel: low cost, easily available, widely used for routine processing, containing 0.6% to 1.5% carbon.
High-speed steel: It has strong wear resistance and is often used for complex processing. It contains tungsten, chromium, molybdenum and carbon steel.
Carbide: Suitable for ultra-high-speed cutting, has high heat resistance and can withstand temperatures up to 1000°C. Its composition includes tungsten, titanium, and tantalum.
Ceramic: has excellent chemical stability and high speed, corrosion resistance, mainly composed of silicon nitride and aluminum oxide.
Other materials: such as diamond tips, carbon boron nitride or cermets, suitable for special working conditions

9.Custom 5-Axis CNC Machining Services

As 5-axis CNC machining has become increasingly advantageous in terms of precision, smoothness, and productivity, the global demand for this machining technology continues to increase. However, for small-volume production, it may be cost-prohibitive to purchase a 5-axis CNC machine outright, and these devices may not be fully utilized when demand is infrequent. Therefore, many large companies and manufacturers offer CNC machining services on an hourly basis.
The fees for 5-axis CNC machining services vary depending on the type of machine tool and the machining needs. Typically, the hourly fees range from $50 to $200. Through these services, customers can customize solutions and obtain high-precision personalized parts manufacturing without incurring high equipment costs. Service providers will provide flexible machining options based on specific needs and production plans.

 

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