A New Direct 9-line Geometric Error Measurement Method for CNC Machine Tools

Abstract

The existing line measurement methods are analyzed. In the process of obtaining the existing error parameters, the assumption conditions in the model developing are adopted, which makes the insufficient adaptability of the model and unreliable measurement results. A method for directly obtaining the error values of the machine tools have suggested by using a high-precision laser interferometer. The 9 lines at different places in the working space of the machine tool is proposed. A three-axes CNC vertical machining center was measured, which proved that the measurement process is easy to operate and the operation is relatively simple, which can be applied to actual industrial field measurement. This method is further popularized and can be used to verify other line measurement methods and check the error models, which has great practical application value.

Geometric error measurement and intelligent error compensation method for CNC machine tools

“…The first is the error of the machine itself, which includes two aspects: one is the deviation of temperature and shape.The so-called "geometric deviation" is the change of the size and shape of the internal parts of the machine tool. These deviations are caused by the machine itself, or because of the use of the machine.When the machine is working, the parts will have some wear and tear, at this time there will be some deviation, but this deviation is very small, so it can be regarded as a kind of static error that will not occur over time.Among them, the perpendicularity error between the axes, the parallelism error between the axes is the focus of this paper.Mechanical thermal deviation is caused by the temperature deviation and the deformation of the parts caused by the temperature of the mechanical parts during manufacturing.At the same time, because the temperature deviation of the equipment itself will also be affected by the outside world, so the temperature must be precisely regulated in the test, in order to reduce its impact on mechanical properties.Among them, the two types of errors are: two types of errors, respectively: two types of errors [1][2][3] .…”