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This paper presents a perfect tracking method by combining iterative learning control (ILC) with disturbance observer (DOB) for CNC machine tools that perform the same tasks repeatedly. Although CNC systems have many nonlinear factors, they can be easily solved by ILC instead of complicated modeling. Also, for repeated disturbance, ILC performs very well and for non-repeated disturbance, DOB works...
In consideration of the disadvantages of traditional measuring methods, a stepwise measurement and identification of machine geometric error method by using Cross Grid Encoder KGM181 is proposed in this paper, and a software module with the function of automatic compensation was made. Based on the theory of multi-body systems, geometric error model is established by using homogeneous coordinate transformation...
In this paper a very accurate and efficient algorithm to compute the inverse kinematics of universal spindle-tilting type five-axis machine tools are presented. The spindle-tilting type five-axis machine is similar to a general serial 5R manipulator. The main idea is computing the complex inverse kinematics of universal spindle-tilting type five-axis machine to realize post processing. The proposed...
Parametric interpolation has many advantages over linear interpolation in machining parts. This paper proposes a real-time look-ahead algorithm for tool path which has been modified to line segments and spline curve segments by segments arrangement and spline fitting. By applying the whole interpolation algorithm, the feedrate would be changed according to the characteristic of the tool path and the...
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