CNC Machine

In the machining industry, any machine whose motion trajectory can be controlled by a program can be called "CNC". However, when we mention "CNC", we usually refer to CNC machining centers that are mainly milling. It integrates multiple functions such as milling, drilling, tapping, reaming, boring, etc., and is a generalist in the field of machining. CNC machine tools (computer numerical control machine tools) are automated machine tools controlled by computer programming. They can accurately execute preset motion trajectories. Compared with traditional machine tools (such as general turning, general milling, manual drilling machines, etc.), CNC machine tools are intelligent and efficient, and can reduce overall production costs by improving production efficiency and processing quality.

General process of CNC machining

1. Obtaining drawings and materials: Drawing materials are the basis of processing and are usually provided by customers. These materials may be presented in 3D (such as STP, XT, IGES and other formats) or 2D (such as DXF and other formats). Although the PDF format is convenient for viewing and communication, it is not an engineering file that can be directly referenced by programming software.

2. Programming: Import the drawing materials into the programming software for programming. Depending on the processing content, you may choose 2D or 3D format. The purpose of programming is to generate a program code that the machine tool can understand.

3. Processing: Copy the program code to the machine tool. After the workpiece and tool are installed, the machine tool can remove excess material according to the specified trajectory to obtain the final product parts. It is worth noting that not all programs can be run on any machine tool, and not all CNC machining centers can process all types of products.

The difference between three-axis, four-axis and five-axis machining methods

Three-axis machining

Three-axis machining is a CNC machining technique where the tool can move along three perpendicular axes (usually X, Y, and Z) relative to the workpiece during machining. These three axes represent two horizontal directions (X and Y) and a vertical direction (Z).

In three-axis machining:

X-axis: Usually represents horizontal left and right movement.

Y-axis: Represents horizontal forward and backward movement, perpendicular to the X-axis.

Z-axis: Represents vertical up and down movement, perpendicular to both the X-axis and Y-axis.

The combined movement of these three axes allows the tool to move along complex paths to precisely remove material from the workpiece to the desired shape and size. Three-axis machining is widely used in a variety of industries, including mold manufacturing, automotive parts production, aerospace, and electronic equipment, for machining flat surfaces, simple curved surfaces, and parts with two-dimensional features.

Although three-axis machining may not be as flexible as more advanced machining methods (such as four-axis or five-axis) when processing complex three-dimensional shapes, it is still an efficient and cost-effective machining method, especially for parts that do not require complex rotation or tilting.

Four-axis machining

Four-axis machining involves a CNC machine tool that moves on four different axes at the same time. These four axes usually include three linear axes, X, Y, and Z, and an additional rotary axis, A-axis. The X, Y, and Z axes represent horizontal left and right movement, forward and backward movement, and vertical up and down movement, respectively, while the A-axis is a rotation axis around the X-axis. The addition of the A-axis can better control the machining process, thereby improving machining precision and accuracy. Through the linkage of these four axes, the four-axis machining center can achieve cutting processing on multiple surfaces of the workpiece.

Four-axis machining is widely used in industries such as aerospace, automobile manufacturing, electronics manufacturing, mold manufacturing, shipbuilding, and sanitary ware and handicraft manufacturing to achieve complex parts processing and improve production efficiency and processing quality.

Although four-axis machining has many advantages, it also has certain limitations. For example, when dealing with certain extremely complex geometric shapes, more advanced processing methods (such as five-axis machining) may be required to achieve it. However, with the continuous advancement of technology and the continuous expansion of applications, four-axis machining will play a more important role in the future.

Five-axis machining

The five axes in five-axis machining work together to allow the tool to perform complex spatial movements during machining. The X, Y, and Z axes represent horizontal left and right, front and back, and vertical up and down movements, respectively. The rotary axis allows the tool or workpiece to rotate around these axes to achieve more complex cutting movements. Five-axis machining can control the movement of multiple axes at the same time, realize all-round cutting of the tool on the workpiece, and improve the flexibility and adaptability of machining.

Five-axis machining can achieve micron-level machining accuracy through high-precision control systems and transmission systems, meeting the machining needs of high-precision parts. It is widely used in aerospace, automobile manufacturing, mold processing, precision machinery, medical equipment, and electronic products.

Although the advantages of five-axis over four-axis and three-axis are very obvious, not all products are suitable for five-axis machining, and products suitable for three-axis machining may not be suitable for five-axis machining. If you use products that can be processed by three-axis and five-axis machining, it will not only increase costs, but the effect may not be very good. Only through reasonable preventive measures and configuring the right machine tool for the product can the value of the machine tool itself be brought into play.