Stainless steel CNC lathe processing quality

There are taper after shaft parts are processed. The main reasons for the taper after shaft parts are as follows:

(1) The rotation center line of the spindle is not parallel to the guide rail of the bed, which belongs to the assembly problem of the machine tool;

(2) The guide rail is severely worn, resulting in the phenomenon of letting the knife;

(3) The chuck of the machine tool processed by the imported CNC lathe is severely worn and the workpiece cannot be fully clamped. There are also two types of taper, namely “positive cone” and “inverted cone”.

For imported CNC lathes, when the spindle rotation center line is not parallel to the bed guide rail or the machine tool guide rail is severely worn, when turning cylindrical workpieces, the workpiece is rotating during the longitudinal movement of the large slide. The parallelism of the axis of the machine tool spindle will cause The taper error of the parts causes the machined parts to produce an inverted taper. When machining on a CNC lathe, you can use the G01 linear interpolation command to compensate for the original error produced by the lathe itself.

For CNC lathes with different shapes of guide rails, which planes should be manipulated separately for straightness errors?

The common shapes of the intermediate guide rails are rectangular guide rails and V-shaped guide rails. The horizontal appearance of the rectangular guide rail controls the straightness error of the guide rail in the straight plane. The two peripheral surfaces of the rectangular guide rail control the linearity error of the guide rail in the horizontal plane. For the V-shaped guide rail, because the guide rail is composed of two oblique surfaces, the two oblique surfaces not only control the straightness error in the straight plane, but also control the straightness error in the horizontal plane.

Imported CNC lathes use the scraping method to repair the straightness errors of the guide rails, and most of them use the research point method. The research point method is often used for the detection of shorter rails, because the flat ruler is simply deformed when it exceeds 2000mm, which is difficult to manufacture and affects the measurement accuracy.

When scraping a short guide rail, the straightness error of the guide rail is usually ensured by the accuracy of the flat ruler. At the same time, there is also a certain demand for the density of the grinding points in the unit area. It can be based on the accuracy requirements in the middle of the processing and the position of the guide in the middle of the processing. The nature and degree of importance are specified to be no less than 10-20 points per 25mm×25mm (that is, the number of points per square).