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The importance of servo motor in laser cutting machine

Release time:

2020-08-25

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The servo motor is a very important part in the laser cutting machine. The quality of the servo motor determines the stability of the equipment, especially the deformation of the machining profile. At present, Yaskawa, Panasonic, Delta, etc. are the most used servo motors in laser cutting machines.

How Servo Motors Affect the Operation of Laser Cutting Machines

For a laser cutting machine, whether it is a flat cutting or a pipe cutting, the key is to process the equipment in accordance with a predetermined pattern. The key lies in the level of dynamic response of each shaft involved in the processing and the coordination between each other. If the overall response of each axis is too slow during processing, or if there is a small deviation of one axis and a large deviation of the other axis in some positions, the problem of deformation of the processing contour will occur. There are many reasons for this inconsistency, including mechanical, external forces, servo responsiveness, and control systems, or multiple factors. Therefore, the key to solving such problems lies in the better dynamic response of each axis and the coordination of mutual coordination, so that it can perform machining operations more strictly according to the established goals. Servomotors, as an intermediate executing mechanism for undertaking mechanical and control systems, can compensate, optimize and coordinate the actions of various systems to a certain extent, so as to achieve more perfect control purposes.

Factors that affect the normal operation of the servo motor:

Mechanical factor

Mechanical problems are relatively common and are mainly reflected in design, transmission methods, installation, materials, and mechanical wear.

Mechanical resonance

The biggest influence of the mechanical resonance problem on the servo is that it cannot continue to improve the responsiveness of the servo motor, so that the entire device operates at a relatively low response state. Such problems are more common in belt-driven machines, and sometimes in long-distance ball screws. The main reason is that the rigidity of the timing belt is low, and the resonance frequency is low. The long distance screw's own inertia is large, and there are many deformations, especially when the motor capacity is selected to be relatively small, it is easier to start. At the same time, the level of assembly process and the quality of the material during installation will also affect the resonance of the machine.

3. Mechanical dithering

Mechanical dithering is also a natural frequency problem of the machine, and it usually appears in a single-end fixed cantilever structure, especially in the acceleration and deceleration phases. The low-frequency jitter will show a large wavy form in the workpiece, and the higher-frequency jitter will have a jagged shape.

4. Mechanical internal stress, external force and other factors

Due to the difference in mechanical materials and installation, the mechanical internal stress and static friction of the transmission shafts on the equipment may not be uniform. If the internal stress or static friction force of one of the two axes involved in trajectory interpolation control is greater in the equipment, the servo torque will be consumed to a certain extent, causing the acceleration of this shaft to slow down, resulting in machining contours. Deformation. Normally, we can observe the internal stress of the driveshaft by feeding back the generated waveform curve from the servo drive.

The external forces acting on the shaft are also similar. General plate cutting machines are non-contact between the shafts and the workpiece and may receive limited external forces. However, for some pipe cutters, the feed axis will participate in the interpolation during cutting, while the other axis is generally non-contact. At this moment, due to the impact of the fixture, the pipe will produce a reverse force on the feed axis, so that the two axes of force involved in the interpolation control are inconsistent, and the effect of the cutting will certainly be affected.

6. Numerical control system factors

In some cases, the servo debugging effect is not obvious, and it may be necessary to intervene in the adjustment of the control system. The linear speed of the laser cutting machine is usually relatively constant, and it is the same speed on the straight line and the curve. This point is not a big problem in the linear motion, but in the processing of curves, especially small-size arcs, the profile may be deformed due to excessive acceleration.