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The difference between 3+2 positioning machining and 5-axis cnc machining
Date: 2022-08-11
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The difference between 3+2 positioning machining and 5-axis cnc machining

Found in 2008, the Xiehe team has long been committed to the processing of high-precision, high-difficulty, and easily deformed metal and plastic parts, light alloy and composite materials (such as aluminum alloy, carbon fiber, etc.) parts, as well as robot parts procurement and customization services. What are the advantages of 3+2 positioning machining and five-axis machining?

1. What is 3+2 positioning processing

When executing a three-axis milling program, the two rotary axes of a five-axis machine are used to hold the tool in a tilted position. This is where the name 3+2 machining technique comes from, also known as a positioning five-axis machine, because the fourth and fifth axes is used to determine the orientation of the tool in a fixed position, rather than the duration of the machining process.

The principle of 3+2 positioning processing is essentially to realize the three-axis function of a specific angle (ie "positioning"). Simply put, when the machine tool is rotated by an angle, machining is performed in a normal three-axis manner.

2. What is 5-axis simultaneous machining

[**]ccording to ISO regulations, when describing the motion of CNC machine tools, the left-handed rectangular coordinate system is used; the coordinate axis parallel to the main shaft is defined as the Z axis, and the rotation coordinates around the X, Y, and Z axes are [**], B, and C, respectively. Usually five-axis linkage refers to the linear interpolation motion of any five coordinates in X, Y, Z, [**], and B.

3. The difference between 3+2 positioning and 5-axis linkage

3+2 positioning processing and 5-axis simultaneous processing are suitable for different industrial objects.

3+2 positioning processing advantages:

1 Shorter, stronger knives can be used.

2 The tool can form a certain angle with the surface, and the spindle head can be extended lower and closer to the workpiece.

3 The tool travel distance is shorter and the program code is less.

Limitations of 3+2 positioning processing:

3+2 positioning machining is generally considered to set a constant angle to the spindle. Complex workpieces may require many oblique views to cover the entire workpiece, but this can result in overlapping toolpaths and increased machining time.

  The advantages:

1. No special fixing device is required. During the machining process, this reduces the cost of fixing devices, avoids multiple clamping, and improves the machining accuracy of the mold.

2. Reduce the number of fixtures used.

3. Many special tools are omitted during processing, thereby reducing tool costs.

4 During the machining process, the effective cutting edge length of the tool can be increased, the cutting force can be reduced, the service life of the tool can be increased, and the cost can be reduced.

The limitations of 5-axis simultaneous machining:

1 Compared with 3+2 positioning, the rigidity of the spindle is poor.

2 In some cases, the five-axis solution is not suitable, such as the tool is too short or the tool holder is too large to avoid vibration at any tilt angle.

3 Compared with the three-axis machine tool, the machining accuracy error is larger.

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