Wed Jun 08 13:57:22 CST 2022
The two-axis verticality of the WEDM is based on the respective straightness. The error of the straight line will be reflected in the verticality measurement. The result of the superposition of the values makes the verticality measurement inaccurate, so it is the first to ensure the respective Straightness, and then ensure mutual perpendicularity.
The verticality of the two axes depends entirely on the verticality of the two sets of guide rails on the middle pallet. When assembling, one set of guide rails is fixed on the reference, and the other set of guide rails are measured and adjusted until the other set of guide rails are perpendicular to the reference. Punch the pin holes to fix the verticality of the two sets of guide rails on the middle pallet. This assembly and measurement process is to pursue a stable and effective operation, and it should also deliberately increase the accuracy by one level. The control of this intermediate process index is very important, because whether it is installation, repair or actual results for a period of time, this accuracy will be achieved. Worse, if the allowable error value is fully used in the initial installation, then the accuracy will be overvalued and inaccurate in the future. For example, if the accuracy standard of a machine tool is 0.02, the internal control accuracy during the first assembly should be below 0.012. The first installation of important parts is strictly controlled and the pins are stable and effective. In addition to the straightness and accuracy of the guide rail itself, the verticality of the two axes is guaranteed.
Like straightness, the working state of the lead screw is also an important factor affecting verticality. Any external force that forms a certain angle with the positioning surface of the guide rail will cause abnormal movement of the guide rail, because the guide rail is only a guide rail and is not clamped. Therefore, once it is found that the verticality of the X and Y axes exceeds the standard, it is necessary to carefully judge whether it is caused by the deformation or misalignment of the guide rail itself or caused by the movement of the lead screw. If it is caused by the guiding effect of the guide rail, repeat the fitting process of loosening and tightening the lead screw and the nut at several positions respectively, and the direction and value of the exceeding standard should be generally stable. If it is caused by the interference of the movement of the screw and the screw nut, the direction and the regularity of the value will be lost. Never loosen the fixing of the guide rail blindly and remove the pins. Any operation that loses judgment is useless. Once the fixing and loosening nails of the guide rail are removed, the whole process of the first assembly and adjustment described above must be repeated.