Applications
Geometric accuracy of linear axes
What
Ensuring straight-line motion in machine tool components is crucial for producing precise and flat workpieces. This accuracy affects the positional accuracy of any point on the workpiece, making it essential for high-precision production.
How
Evaluate the positioning, straightness, and tilt for straight-line motion according to the definitions in the ISO 230-1 standard, taking into account influences such as gravity, rail errors, or thermal effects.
Why
Knowing geometric errors of the machine tool helps to understand where improvements are necessary and where tolerances could be relaxed in order to save costs.
Contour error evaluation
What
Deviations from the desired setpoints during machining cause workpiece errors.
How
Solve transient simulations of your setpoints and evaluate the dynamic contour error of the mechatronic system at the TCP. Consider and compare various influences like:
- structural dynamics
- friction
- feedforward control
- controller parametrisation
- setpoint variation
- position dependency
Why
Knowing the dynamic contour error helps to assess the performance of the machine, find limitations and achieve the best possible performance.
Dynamic tracking error evaluation
What
The dynamic tracking error describes the deviation of the actual trajectory to the set point, disregarding the deviation caused by a lag. Consequently, it’s the only part of the tracking error that leads to contour errors if axes are synchronised.
How
With just one frequency response analysis in the closed control loop, you can evaluate the dynamic tracking error of the mechatronic system. The error takes into account the dynamic limits of your machine and can be analysed on the encoder and the TCP.
Why
Knowing the dynamic tracking error in the frequency domain means that you know the worst-case error at the TCP for all possible setpoints. By animating the vibration shape, you can identify bottlenecks and optimise the performance of your machine, overcoming limitations and adding improvements in the right spots.
Thermal drift
What
How
Evaluate the TCP displacement over time (thermal drift) by considering various thermal influences, including but not limited to:
- changing environment temperature
- switching cutting fluid on/off
- motor power losses
- cooling (e.g. motor, structure, spindle)
- local heat sources and sinks
Why
Understand thermal influences and accuracy and use this knowledge to improve thermal stability.
Switching cutting fluid on/off
What
How
Solve seamless transient simulations with changing heat transfer coefficients. Evaluate the temperature and displacement at probes (e.g. TCP).
Why
Understand thermal influences and accuracy and use this knowledge to improve thermal stability.
Worst-case positioning
What
Positioning the axes is a common application in automated systems. The key factors here are overshoot and settling time at the TCP, which depend on the selected dynamic limits and the positioning length.
How
Transient simulation of the move and settle behaviour within milliseconds with the Linear Periodic Response Solver. Systematic evaluation of TCP overshoot and settling time through parameter studies such as variation of positioning length. Evaluation of the worst-case and best-case scenarios.
Why
Knowing the positioning behaviour helps to reduce risks during development and optimise your design. In addition, customer specifications can be checked in advance.
Spindle imbalance
What
Spindle vibrations caused by imbalance are a well-known problem in many production machines. The resulting TCP deviation depends on the dynamic properties of the machine and the spindle speed.
How
Evaluate the frequency response of your machine by considering a complete spindle run-up and imbalance in different directions. Analyse the TCP displacement and rotation as well as the animation of the vibration as a function of the spindle speed.
Why
Understanding the influence of imbalances on the dynamic behaviour of your machine helps to optimise your design, define requirements on balancing, and increase performance.
Varying machining positions
What
Large linear or rotating movements during machining can change the thermal boundary and coupling conditions, such as the location of heat transfer from linear guide carriages to rail. This leads to a change in the thermomechanical behaviour and can thus lead to displacements at the TCP.
How
Efficiently solve transient thermal and thermomechanical simulations with position variations. Evaluate the displacement at the TCP for different machining positions.
Why
Understanding the influence of position variations on thermomechanical behaviour is crucial to achieve thermal robustness within the entire workspace.
These applications are just a selection of what is possible using MORe.
Please contact us for further possibilities and customised solutions.