Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore
doi:10.3850/978-981-18-6021-8_OR-09-0158
Tool point FRF estimation on multipurpose Tool point FRF estimation on multipurpose
1Department of Ultra-Precision Machines & Systems, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Republic of Korea
ABSTRACT
Contact parameter in the high-speed spindle is an important parameter in tool point frequency response function (FRF) prediction, or receptance, which is the key factor in calculating the best operation condition of the spindle. In this paper, we describe an approach for the compensation tool and tool holder contact parameter by removing the effect of mass loading of an accelerometer used in the experiment process. The mass effect of the accelerometer is removed from tool point FRF by inversed Receptance Coupling Substructure Analysis (RCSA) in advance of estimating the contact parameter. The result contact parameter was used to predict the tool point FRF of the spindle. The drawbar in the automatic tool change mechanism is coupled to the shaft of the spindle. The contact parameter of a tool holder and tool is evaluated from the experiment. The tool, tool holder and shaft receptance were modeled by the Timoshenko beam theory. The fidelity of tool point FRF of spindle and stability lobe diagram after being predicted with the proposed method is improved.
Keywords: Spindle, Modeling, Stability, Drawbar, RCSA
1Department of Ultra-Precision Machines & Systems, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Republic of Korea
ABSTRACT
Contact parameter in the high-speed spindle is an important parameter in tool point frequency response function (FRF) prediction, or receptance, which is the key factor in calculating the best operation condition of the spindle. In this paper, we describe an approach for the compensation tool and tool holder contact parameter by removing the effect of mass loading of an accelerometer used in the experiment process. The mass effect of the accelerometer is removed from tool point FRF by inversed Receptance Coupling Substructure Analysis (RCSA) in advance of estimating the contact parameter. The result contact parameter was used to predict the tool point FRF of the spindle. The drawbar in the automatic tool change mechanism is coupled to the shaft of the spindle. The contact parameter of a tool holder and tool is evaluated from the experiment. The tool, tool holder and shaft receptance were modeled by the Timoshenko beam theory. The fidelity of tool point FRF of spindle and stability lobe diagram after being predicted with the proposed method is improved.
Keywords: Spindle, Modeling, Stability, Drawbar, RCSA
