For laser cutting machine, whether it is flat or cut pipe cutting, you want the equipment in accordance with the established graphics processing, the key is to participate in the processing of the dynamic response of the various axes of the level and the coordination between each other. If the overall response of each axis is too slow during processing, or if there is a situation where the axis deviation is small and the other axis is large, the deformation of the contour will occur. There are many reasons for the occurrence of such inconsistencies, mechanical, external, servo response, control system and other factors, or multi-factor superposition. Therefore, the key to solve such problems is that each axis has good dynamic response and coordination between each other, so that it can be more strictly in accordance with established goals for burning laser pointer processing action. Servo motor as a mechanical and control system to undertake the middle of the implementing agencies, to a certain extent, make up, optimize and coordinate the action of each system to achieve a more perfect control purposes.
In addition to the stability of the servo motor itself, the external factors that affect its normal operation include:
Mechanical factors. Mechanical problems are relatively common, mainly in the design, transmission, installation, material, mechanical wear and so on.
Mechanical resonance. The greatest effect of the mechanical resonance problem on the servo is that it can not continue to improve the responsiveness of the servo motor, thus operating the device as a whole in a relatively low response state. Such problems in the synchronous belt drive machinery is more common, and other3000mw green laser long-distance ball screw sometimes have such a situation. The main reason is the rigidity of the timing belt is low, the resonant frequency is low, the long distance of the screw itself inertia is large, and there are many deformation cases, especially in the case of small motor capacity selection is relatively easy to start vibration. At the same time the installation of the assembly process and the quality of the merits of the mechanical resonance will also have an impact.
Mechanical jitter. Mechanical jitter is also a natural frequency of mechanical problems, usually more often appear in the single-ended fixed cantilever structure, especially in the acceleration and deceleration phase performance is particularly evident. Low-frequency jitter in the workpiece will show a large wave-like form, the higher the frequency of jitter will be jagged form.
Mechanical stress, external force and other factors. Due to the difference in mechanical material and installation, the mechanical internal stress and static friction of the drive shaft on the equipment may be inconsistent. If the internal stress or static friction of a shaft involved in the two green astronomy laser axes of the trajectory interpolation control is greater, the torque of the servo will be consumed to some extent, causing the acceleration of the shaft to slow down, resulting in processing contours Deformation. Normally we can observe the internal stress problem of the drive shaft by feedback from the servo driver.
The effect of external forces on the shaft is also similar. The general plate cutting machine, the shaft and the workpiece is non-contact between, may be limited by the external force. But some pipe cutting machine, tube axis will participate in the cutting time of interpolation, while the other axis is generally non-contact. At this time due to the impact of the pipe by the fixture will produce a reverse force on the tube axis, so participate in interpolation control of the two-axis force situation is inconsistent, the cutting effect will certainly be affected.
Numerical control system factor. In some cases, the servo debugging brightest laser pointer effect is not obvious, this time may be involved in the adjustment of the control system. Laser cutting machine processing speed is usually relatively constant, in the straight line and the curve are the same speed. This is not a big problem in the linear motion, but in the curve, especially the small size of the arc may be due to excessive acceleration caused by contour deformation of the situation.
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http://hokisvisrum.org/laserman123/blog/8590/two-photon-excited-laser-scanning-real-time-stereomicroscope
