Measurement of Static Stiffness after Motion on a Three-Axis CNC Milling Table

Stejskal, Tomáš; Svetlík, Jozef; Dovica, Miroslav; Demeč, Peter; Král, Jan

doi:10.3390/app8010015

Cited by 15 publications

(9 citation statements)

References 25 publications

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“…For that reason, we did not proceed with creating the mathematical model. Only a schematic model has been created ( Figure 16) [14].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical and Experimental Research of Machine Tool Accuracy

Demeč¹,

Stejskal²

2020

Machine Tools [Working Title]

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In this chapter, one of the ways of modelling the working accuracy of machine tools is elaborated. The method of constructing a numerical model based on transmission matrices is applicable in the field of virtual prototyping of modern machine tools. The results of numerical simulation of working precision are closely related to the machine stiffness in the machine workspace. A new way of measuring static stiffness can support numerical simulation results. Measurement of static stiffness is based on the measurement of the positioning accuracy of machine tools. The difference of the method lies in the load of the measured axis during the measurement. In this way, the stiffness of the movable machine partly relative to the base can be determined. The method for measuring static stiffness can advantageously be used in the development of new machine designs.

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“…For that reason, we did not proceed with creating the mathematical model. Only a schematic model has been created ( Figure 16) [14].…”

Section: Discussionmentioning

confidence: 99%

“…For experimental static stiffness measurement, the Kondia B 640 CNC Vertical Milling Machine was used as a production machine with three fully controlled axes [14].…”

Section: Arrangement Of Experimentsmentioning

confidence: 99%

Analytical and Experimental Research of Machine Tool Accuracy

Demeč¹,

Stejskal²

2020

Machine Tools [Working Title]

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“…However, the clamped device is difficult to find a suitable location to be installed during the measurement, and the selected reference point is also prone to deformation occurred, affecting the test accuracy. 6,7 Through FE static analysis, the accuracy of the FE model at the joint surface cannot be guaranteed, leading to large error for FE analysis. In general, the static stiffness method is not simple and the low-accuracy for static conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the dynamic identification method of the weak part of the bar-shaped combined structure

Guo

Meng

Cao

et al. 2021

Advances in Mechanical Engineering

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The weak part of the stiffness of machine tool combined structure is the key to improve the stiffness of machine tool. To overcome the static deformation with difficulty acquisition, the paper chooses machine tool combined structure which can be equivalent to one-dimensional bar structure, and a weakness index (WI) is proposed to identify the weak part of the stiffness by means of the dynamic hammer test method. Based on the bar structure as a numerical example, the weak parts are modeled as EA reduction in stiffness while the mass is maintained at a constant value. Thorough finite element (FE) method simulations are performed to assess the robustness and limitations of the method in several scenarios with single and multiple weakness. On the crossbeam of gantry type machine tool, the sensors are used to collect vibration data, the structural modal parameters are obtained by singular value decomposition (SVD) technique, and the dynamic characteristics are systematically reconstructed by using modal state space method to obtain stiffness data at zero-frequency. Then, the weak part of the structural stiffness is identified by the weakness index. Finally, the comparison of FE simulations and experiment results are provided to illustrate the working of the method.

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“…Portable stiffness diagnostic devices have not yet been developed. The issue of measuring the static stiffness of machines is dealt with in works [6][7][8]. There are relatively few research papers on the stiffness measurement methodology.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of the static stiffness of machine parts and structures by changing the magnitude of the hysteresis as a function of loading

et al. 2019

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Static stiffness is determined by one-sided loading and unloading of machine parts relative to the selected base. For each structure, there will be some loss of potential energy due to the dissipative forces that occur during the loading inside the structure. This loss is manifested in hysteresis in the stiffness diagram. A new approach to the assessment of static stiffness consists in gradual, bilateral loading and unloading of the structure through the effect of static forces of different magnitude. In this process, the stiffness hysteresis varies, depending on the intrinsic nature of the dissipative forces, a specific property suitable for assessing the condition of machines.

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Measurement of Static Stiffness after Motion on a Three-Axis CNC Milling Table

Cited by 15 publications

References 25 publications

Analytical and Experimental Research of Machine Tool Accuracy

Analytical and Experimental Research of Machine Tool Accuracy

Study on the dynamic identification method of the weak part of the bar-shaped combined structure

Experimental assessment of the static stiffness of machine parts and structures by changing the magnitude of the hysteresis as a function of loading

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