A new geometric error budget method of multi-axis machine tool based on improved value analysis

Abstract

The improvement of the accuracy grade of main components in the production process through balancing between function and cost helps to improve the overall accuracy of machine tools. Therefore, this paper presents an improved value analysis method and uses the method of global sensitivity analysis and geometric error correlation analysis to analyze and optimize the error parameters of a 4-axis machining tool based on the proposed method. The geometric error modeling of the 4-axis machine tool was established by using the homogeneous transformation matrices (HTMs). By using global sensitivity analysis, the degree of influence of each error parameter on the accuracy of machine tool was obtained, and functional coefficient and cost coefficient of value analysis were gained by correlation analysis. An optimization model for geometric error budget of machine tool was established according to the improved value analysis theory, and the machining accuracy of machine tool was optimized according to the improved value analysis method.

All position-independent and position-dependent geometric error measurement and identification of the precision of a horizontal boring machine tool

“…Schwenke et al and Ibarali S reviewed measurement methodologies of multi-axis machine tool about identifying the value of geometric errors [30,31]. Based on these studies, geometric errors are characterized by these special measuring methods, such as laser interferometer measurement method [32,33], plane grating method [13], machine visual inspection method [34], artifact standard method [35], R-test measurement method [36], laser tracker measurement method [10,37], double ballbar (DBB) method [38], machining test method [39], and so on. However, some of these approaches are susceptible to range of measurement, such as DBB and plane grating method.…”

A novel approach to calculating the dynamic error reflected on an S-shaped test piece

“…With the rapid development of modern manufacturing, increasingly complex curved parts are employed in aerospace, automobile, shipbuilding, precision machinery and other fields. 1–3 Due to the addition of two rotating axes, five-axis numerical control (NC) machine tools are more widely used than three-axis NC machine tools in the field of complex surface machining. 4–6 The dynamic performance of five-axis NC machine tools is the main factor used in determining the surface processing quality of complex curved parts.…”