R&D of the machine tools with the linear motors

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(1)Analysis of the characteristics of the feed drive mechanism with linear motors and fabrication of the mechanismFor the development of the feed drive system with high speed, high accuracy and high servo gain, the FEM analysis of the structure of feed drive mechanism and the saddle have been conducted. Servo analysis have been conducted on the characteristics of the structures using the mechanical model obtained by FEM analysis. As the results it is confirmed that the model has 80 m/min of the top speed, 2.0 G of acceleration rate and 200 1/s of position loop gain. Based on these analyzes the test stand has been fabricated.(2)Evaluation of the performance of the fabricated feed drive systemVibration analysis of the feed drive system fabricated at (1) has been conducted by using hammering test and FFT analyzer. The measured natural frequency of the first order of the feed drive mechanism is 150 Hz, and the position loop gain obtained is 160 1/s. The latter is smaller than the desired value 200 1/s.(3)Feasibility study of the machining center with the linear motorsBased on the obtained results (1) and (2) on the single axia, the structure of the machining center with the linear motors which consists of 3 straight motion axs (X,Y,Z) and 1 rotating axis (B) is designed and the characteristics of the machine structure are checked by simulations. As the results the desired specifications would not be achieved without the adaptation of the structure which do not stag the motion axis onto another motion axis.