What are the elements of choosing a five-axis machining center?

In this issue, we will take the industry-leading five-axis machining center as an example to introduce the main factors that need to be considered in choosing a five-axis machining center.

1, the structure determines the equipment performance

The five-axis machining center has a variety of structures, and the structural design of the machine tool determines the performance of the equipment from the basis, which determines the rigidity, processing accuracy, stability, operability and so on.

The following aspects should be considered:

1) Linear axes do not merge when moving

2) The equipment with short cutting circuit has good rigidity

3) Whether the tilt rotation shaft is a DD motor

4) Whether it is 5-axis linkage

5) 5-axis proximity

The five-axis machining center adopts the "Z" type high-rigidity table structure, as shown in the following figure, the table does not need to be supported at both ends, the large-diameter inclined bearing, and the workpiece center of gravity B is in A. Compared with the traditional single support structure, the bending amount d is very small, and the moment arm L is shorter.

This inclined axis structure enables high precision machining comparable to 3-axis machining centers. Even if the heavy parts are loaded and rotated, the amount of deflection of the table can be controlled to a minimum, at the same time, the high rigidity bearing and the direct drive motor can also achieve high precision and smooth rotation with low vibration. In addition, it has excellent spatial proximity.

The tilted axis structure has excellent spatial proximity

2, tilt rotation axis accuracy

The machining accuracy of the machine tool is directly affected by the precision of the rotating axis. The D800Z machine tool is used to understand the actual influence of the tilt rotating axis accuracy on the machining accuracy.

The minimum resolution of the B/C axis of the D800Z machine tool is 0.0001 degree, that is, 0.36 ", and the positioning accuracy is ±3 ". Through the calculation diagram below, we can know the accuracy error generated.

3, interference collision prevention

Interference collision avoidance is a problem that can not be ignored in 5-axis machining. In addition to the use of computer-side software interference inspection, the 5-axis machining center is equipped with online real-time simulation CSG function, which can prevent interference even in manual mode.

Online real-time simulation of the CSG function allows possible tooling errors or tool length setting errors to be checked prior to machining in order to minimize emergency stops in operation. In operation, the position information can be read based on the data adjusted in advance, as well as the coordinates and offset values in the CNC control device, and the possibility of interference can be predicted. Once the machine stops running, the condition picture can be displayed in real time, and the predicted interference position and shaft direction of action can be confirmed.

4. Rotation center correction

Due to changes in the rotation center caused by changes in the environment and temperature, it will affect the accuracy of five-axis machining, and it should be able to be automatically corrected by the probe, and the accuracy of 3-axis/indexing / 5-axis machining is verified, and the cutter error is <±4μm.

5, linkage accuracy

The linkage accuracy of five-axis machining center is the embodiment of multi-factor results.

6. Process support

The processing technology of the five-axis machining center determines whether the performance of the equipment can be maximized. For example, the special-shaped tool can greatly improve the processing efficiency.