This paper presents an innovative system determining machine tool quasi-static stiffness in machining space, so-called Stiffness Workspace System (SWS). The system allows for the assessment of the accuracy of a machine which has become a vital aspect over past years for machine tool manufacturers and users. Since machine tools static stiffness is one of the main criteria using to evaluate the machines' quality, it is crucial to highlight the relevance of experimental and analytical stiffness determination methods. Therefore, the proposed method is applied to estimate the spatial variation of static stiffness in the machine tool workspace. This paper describes the SWS system—its design, working principle, mounting conditions and signal processing. The major advantage of the system is the capability to apply forces of controlled magnitude and orientation as well as simultaneously measure the resulting displacements. The obtained results give possibility to estimate and evaluate static stiffness coefficients depending on the position and direction under loaded conditions. The results confirm the validity of the analyses of spatial stiffness distribution in the machine workspace.

本文提出了一种创新的系统，用于确定加工空间中的机床准静态刚度，即所谓的刚度工作空间系统（SWS）。该系统允许评估机器的精度，这对于机床制造商和用户而言，在过去的几年中已成为至关重要的方面。由于机床的静态刚度是评估机床质量的主要标准之一，因此强调实验和分析刚度确定方法的相关性至关重要。因此，所提出的方法被应用于估计机床工作空间中静态刚度的空间变化。本文介绍了SWS系统-其设计，工作原理，安装条件和信号处理。该系统的主要优点是能够施加大小和方向受控的力，并同时测量所产生的位移。所获得的结果使根据载荷条件下的位置和方向估算和评估静态刚度系数成为可能。结果证实了机器工作空间中空间刚度分布分析的有效性。