Application of Siemens SINUMERIK 840D in five-axis machining (3)

Load related to acceleration

For the movement of the table, the control system can automatically calculate the workpiece weight, the optimal acceleration and the JERK relative to the actual movement. Thus, the machine performance can always be controlled to the limit value for maximum productivity.

The surface quality is subject to shaft vibrations that are forced or violated by the process at any time. For large machine tools, the mechanical impact cannot be completely avoided. The corrective action can be achieved by activating the vibration damping of the SINUMERIK 840D ("Advanced Position Control", APC) in conjunction with the Performance2 control board that drives the SIMODRIVE 611D.

On gear machines, electronic direct drives are increasingly replacing traditional shaft and drive systems. Load shocks of different stresses due to differences in material hardness and material removal are added during processing. They affect the drive shaft and cause the trajectory to deviate. But for Siemens, the direct drive with the "Dynamic Stiffness Control" function avoids this problem. During the 0.06ms cycle time, the DSC adjusts the deviation of the internal adjustment of the drive relative to the ideal trajectory, which is faster than the traditional process. As a result, the tool maintains an ideal programming trajectory at maximum feed rates and cutting forces.

The SINUMERIK 840D is the first worldwide control system to compensate for geometric residual errors with special algorithms. Compensable errors include:

- linear positional deviation;

- the verticality of the guide rail;

- The perpendicularity between the axis and the axis.

Often, machine tools can only reduce these errors by making mechanical measurements at large expense.

Conclusion

The Siemens SINUMERIK 840D system offers unparalleled performance and functionality for five-axis machining, especially for the machining of very complex structural parts and engine components on aircraft, offering many benefits to customers, including:

- simplify programming;

- High flexibility, because the same NC program can be used on machine tools with different motion structures;

- Save costs in every step by optimizing motion control, shortening processing time;

- Improved spatial accuracy and surface quality through universal compensation.

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