Manhart How to determine the stability of a CNC punching machine during parameter adjustment?

When assessing the stability of a CNC punching machine during parameter adjustment, the following key points can be analyzed:
1. * * Observe the operating status of the machine * *:
-After adjusting the parameters, carefully observe the operating status of the CNC punching machine, especially the spindle rotation, relative motion between the tool and the workpiece, etc. The smoothness and coherence of these movements are important indicators for judging dynamic stability.
-Pay attention to any abnormal sounds, vibrations, overheating, or other conditions. These phenomena often indicate the presence of unstable factors during the operation of the machine.
2. * * Evaluate processing quality * *:
-Perform quality inspection on the machined parts after parameter adjustment, including dimensional accuracy, surface quality, etc. Stable processing parameters should ensure consistency in the quality of the workpiece.
-If there are significant fluctuations in processing quality or a large number of defective products, it may indicate improper parameter adjustment and require further adjustment.
3. * * Consider processing efficiency * *:
-Stable parameter settings should improve processing efficiency, reduce downtime and downtime.
-If the processing efficiency significantly decreases after parameter adjustment, or if frequent shutdowns, jamming, and other situations occur, it may indicate poor machine stability.
4. * * Check system alarm and fault records * *:
-The fault alarm system of the CNC punching machine can indicate the specific location and possible causes of the fault. After parameter adjustment, close attention should be paid to system alarms and fault records, and abnormal situations should be dealt with in a timely manner.
-If there are frequent system alarms or malfunctions, it may indicate improper parameter adjustments that affect the stability of the machine.
5. * * Stability analysis method using PID control system * *:
-If the CNC punching machine is equipped with a PID control system, its dynamic and static characteristics and control methods can be used to determine the stability of the system. For example, by observing parameters such as overshoot and adjustment time under unit step response, the speed and dynamic quality of the system can be determined.
-The Bode plot of the system can also be used to determine the stability of an open-loop system. If the open-loop logarithmic amplitude frequency characteristic reaches 0dB and its logarithmic phase frequency characteristic is still above -180 °, then the system has positive phase margin and positive amplitude margin, and the system is stable.
6. * * Taking into account external factors * *:
-In addition to the operational status and processing quality of the machine itself, the stability of the power supply voltage, environmental temperature, humidity, and other external factors that affect the stability of the machine should also be considered. These factors may indirectly affect the stability of the machine by affecting the accuracy and response speed of the control system.
Through comprehensive analysis and judgment of the above aspects, the stability of the CNC punching machine during parameter adjustment can be accurately evaluated. If instability is found in the machine, parameters should be adjusted or the operating status of each component of the machine should be checked in a timely manner to ensure the smooth progress of the machining process.