R&D of the machine tools with the linear motors

（1）直线电机进给驱动机构的特点分析及机构的制作为了研制高速、高精度、高伺服增益的进给驱动系统，本文对进给驱动机构和刀架的结构进行了有限元分析。利用有限元分析得到的力学模型对结构的特性进行了伺服分析。结果表明，该模型最高速度为80 m/min，加速度为2.0 G，位置环增益为200 1/s。在此基础上，制作了试验台架.（2）进给驱动系统的性能评价利用锤击试验和FFT分析仪对（1）中制造的进给驱动系统进行了振动分析。测量的进给驱动机构的一阶固有频率为150 Hz，并且获得的位置回路增益为160 1/s。后者小于所需值200 1/s。（3）直线电机加工中心的可行性研究在单轴直线电机加工中心的研究结果（1）和（2）的基础上，设计了由三个直线运动轴（X，Y，Z）和一个旋转轴（B）组成的直线电机加工中心的结构，并通过仿真验证了机床结构的特性。因此，如果不对不使运动轴交错到另一运动轴上的结构进行调整，就无法实现所需的规格。

(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.