A Study on Highly Function Integrated Spindle System for Advanced FMS

为了发展面向21世纪的先进柔性制造系统，实现功能强大的机床主轴集成系统显得尤为重要。该主轴系统具有精度高、调速范围宽、集多功能于一体等特点。随着新的制造要求的出现。在本研究中，对高功能集成主轴系统的设计进行了必要和不可缺少的研究。第一个目标是测量主轴系统中轴承与其外壳之间的关节的接触压力。二是在机器工作状态下如何控制应有的接触压力。第三是轴承预紧力的测量。所提出的超声波接触式压力测量方法即使是由圆柱形表面组成的关节也是有效的。回波的小波变换参数对接触压力的估计具有重要意义。通过所提出的“锥节式轴承座”系统，接触压力的控制基本上是可能的。它具有足够的功能，可用于改变轴承与其外壳之间关节的接触压力。采用外圈轴承套圈的压缩应变测量了轴承预紧力。应变片的输出与预紧力和主轴伸长率有显著关系。在此基础上，提出了一种多层主轴系统的基本结构——双层主轴系统。利用双层主轴箱模型，对主轴结构的热行为进行了不同程度的研究，最终提出了相应的设计方法。阐明了主轴内、外主轴单元的基本热行为和相互作用。它被认为主要受身体结构中热源之间平衡的影响。利用所提出的冷却系统，确定了主轴单元，特别是封闭空间内气流的冷却效果。热变形的补救基本上是可能的，使用这样的冷却系统在内部和外部主轴单元之间的传热控制。少

It becomes more important to realize highly function integrated spindle system for machine tool in order to develop the advanced flexible manufacturing system toward the 21st century. That kind of spindle system is characterized by higher accuracy, wider range of speed, integrated multiple-function and so on., with advent of the new manufacturing requirement. In this research, some studies which are necessary and indispensable for design of highly function integrated spindle system have been carried out. The first objective is the measurement of contact pressure of the joint between the bearing and its housing in the main spindle system. The second is how to control the due contact pressure in the machine work condition. The third is concerned with bearing preload measurement.The proposed method for contact pressure measurement using ultrasonic waves is effective even if the joint consists of cylindrical surfaces. And also, the parameter by wavelet transform of echo is significantly im … More portant for evaluating the contact pressure.The control of contact pressure has been basically possible by means of the proposed system named "Taper joint type bearing housing". It has sufficient function available for changing the contact pressure of the joint between the bearing and its housing.The bearing preload has been measured by the compressive strain of bearing collar for outer ring. The output of strain gage has significant relationship with the preload and the elongation of the spindle.A two-layred spindle system, which is basic configuration of multiple-layred type, has been proposed based on the results of these studies. The thermal behavior in the main spindle structure has been investigated to a various extent using the headstock model with a two-layred spindle, finally aiming at the proposal of the due design methodology. The basic thermal behavior and the mutural effects between inner and outer spindle units has been clarified. It is considered to be mainly influenced by the balance between heat sources in the body structure.The cooling effects of air flow in the spindle unit, especially the enclosed space has been ascertained using the proposed cooling system. The remedy of thermal deformation is basically possible using such a cooling system in the control of the heat transfer between the inner and outer spindle units. Less