Instructions for the use of cutting compensation for CNC cutting machines

The term kerf compensation of CNC cutting machine comes from CNC flame cutting machine. However, with the development of science and technology, a series of cutting products such as plasma cutting machine, laser cutting machine, waterjet cutting machine and so on have emerged. However, during the cutting process, the size of the workpiece to be cut is 1~3mm smaller than the actual drawing size. Shortcomings. In order to solve this problem, slit compensation plays a vital role.

In cutting, flame, plasma, laser, water jet (water jet), wire cutting machine and other various CNC cutting, according to the CNC instruction cutting path is the theoretical size, the actual cutting size is small When cutting, there are slits, which are part of the loss during cutting. Therefore, if there is no compensation for geometric dimensions, the length of the outer contour part of the actual cut part of the part size will become smaller, and the inner contour size will become larger (two The width of the side is different from the width of the cutting groove, and the side of the gap is half of the cutting groove).

In order to compensate for the size difference caused by the cut loss, it is necessary to compensate the geometric size, software compensation and numerical control system compensation. The ultimate goal is to move the track of the cutting machine, and form the incision wear after cutting. The size is exactly equal to the size of the programming diagram. This can be easily solved by nesting software. After nesting software programming, enter the programming parameters (compensation radius) and software compensation. When generating the NC code, the geometry will automatically offset according to the internal and external contours. (Note that only closed contours can be compensated) In the CNC code, offset instructions (left compensation, right compensation and closed compensation, such as G41G42G40) can also be generated so that the CNC system can continue to compensate the offset direction according to the compensation. If the software compensation amount is set to 0, no compensation will be generated, but the compensation command still exists, and it can be compensated by the CNC system during cutting.

When setting the slot compensation, please pay attention to the following points:

1. After the software compensation is installed, it is generally not necessary to perform compensation in the cnc system, otherwise the compensation repeat size will cause deviation. However, if the software compensation is still too small after the reduction, it can be compensated again through the cnc system.

2. When the numerical control system is compensated, the compensation amount should be set to zero in the software.

3. If you are not sure how much you should compensate, you can cut a rectangle on the scrap, measure the actual size and program size, and calculate the amount of compensation required.

It is difficult for the numerical control system to deal with the compensation of small arcs. When the arc is smaller than the compensation radius, it cannot be cut and cannot be compensated correctly (theoretical radius is negative). In this case, you should consider modifying the components, or consider using software compensation, to find the problem in time.

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