The machining principle of non circular curves in precision parts machining

In the processing of precision parts, non circular curves are divided into analytical curves and non analytical curves similar to list curves. For manual programming, the general solution is to process analytical curves. Therefore, this section mainly analyzes the processing error of analytical curves. The mathematical expression of analytical curve can be given in the form of Cartesian coordinate system of y=(x), polar coordinates of p=p (), or parametric equations. Through coordinate transformation, the latter two forms of mathematical expressions can be converted into Cartesian coordinate system expressions. This type of parts and various rotating parts processed on CNC lathes with non circular curves as the generatrix are mainly used.

The programming method in precision part machining is as follows: Firstly, it should be decided whether to use straight line segments to approximate non circular curves or arc segments to approximate non circular curves. If a straight line segment is used to approximate a non circular curve, there are sharp corners at the connection between each straight line segment. Due to the inability of the tool to continuously cut the part at the sharp corners, hard points or cutting marks will appear on the surface of the part, resulting in poor surface quality.