Release time: 2019-09-29
1. Cutting machine accuracy issues:
Cutting machine precision includes mechanical precision and electronic precision.
The mechanical accuracy is mainly affected by the straightness, parallelism, levelness of the guide rail, the transmission accuracy of gears or steel belts, etc. The levelness of the cutting platform also affects the accuracy of the workpiece. The electronic accuracy is affected by the CNC system software and motion control card, pulse equivalent, servo and servo drive, etc. Especially if the pulse equivalent is not adjusted, it will cause problems such as non-circular cutting circles and large parts with different sizes.
It is also very simple to check the accuracy of the cutting machine, just install a scribe needle on the cutting machine, run the cutting machine to correct the error program and check the line.
2. The quality of the cutting nozzle and the compensation of the cutting seam:
The quality of the cutting nozzle will affect the surface quality of the workpiece and the flatness of the cutting side. The slit compensation must be consistent with the actual slit width. The method to reduce this type of error is to choose a cutting tip of acceptable quality. The size of the cutting tip should also be suitable for the thickness and material of the board to be cut. You can first try cutting and adjusting on the waste until the slit width is uniform and the section is flat without slag. Cut a fixed-size rectangle without compensation, and then measure the width of the slit as small as possible.
3. Graphic size error:
There may be negligence in the drawing or nesting process that causes the wrong graphic size. In this case, you can check the size to find out the cause.
4. Programming software error:
If there is a defect in the programming software or there is no cumulative error correction function, it will cause an error in the generated NC code. For example, the generated code size data is wrong or the compensation direction is wrong; or there is a cumulative error in the code, which causes no problems in the small area size, and there are large errors when there are many line segments. The deviation of the workpiece distance during material feeding.
It is easy to check the program problems. As long as the NC code is converted to CAD graphics for measurement, the compensation direction can be seen through simulation to see if it is correct.
5. Random cutting machine running randomly:
Voltage fluctuations, loose data lines can cause poor contact between the system and the servo control line, loss of servo feedback signals, and unstable servo drive circuits can all cause irregular running of the CNC plasma cutting machine.
Principles for judging the phenomenon of cutting machine chaos:
1) Random chaos can eliminate the problem of NC program
2) Run regularly to check whether there is a problem with the program through simulation. If the program is OK, check the system software (including the built-in software of the axis card).
6. Deformation during cutting:
Deformation mainly includes thermal deformation and deformation caused by gravity. Reasonable lead positions and cutting directions can be used to reduce deformation during programming. Some cooling devices can be added as needed, and a cutting platform with reasonable structure can be used.
7. Errors caused by common edges:
If common edges are used, the compensation amount, the actual slit width, and the distance between the common edges of the workpiece must be the same. If they are not consistent, the workpiece size will be larger or smaller.
In summary, errors can be divided into pre-cut errors and post-cut errors. For a certain program, pre-cut errors can be checked by scribing. Post-cut errors need to be optimized by a reasonable cutting process to reduce errors.
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