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，实现机床主轴系统的高功能集成化显得尤为重要。随着新的制造要求的到来，这种主轴系统具有精度高、速度范围广、多功能一体化等特点。本研究对高性能集成主轴系统的设计进行了必要和必要的研究。第一个目标是测量主轴系统中轴承与其壳体之间的连接接触压力。二是如何控制机器工作状态下的应有接触压力。三是关于轴承预紧力的测量，提出了一种基于超声波的接触压力测量方法，该方法在关节为圆柱面的情况下也是有效的。此外，对回波信号进行小波变换后的参数在…中也有显著的提高通过所提出的“圆锥接头式轴承座”系统，接触压力的控制基本成为可能。它具有足够的功能来改变轴承与轴承座连接处的接触压力。轴承预紧力是通过外圈轴承套的压应变来测量的。应变片的输出与主轴的预紧力和延伸率有很大的关系，在此基础上提出了一种两层主轴系统，这是多层式的基本结构。利用两层主轴的主轴箱模型，对主轴结构的热行为进行了不同程度的研究，并提出了相应的设计方法。阐明了内外轴单元之间的基本热行为和相互作用。该冷却系统被认为主要受机体结构中热源之间的平衡影响，并利用所提出的冷却系统确定了主轴单元内气流的冷却效果，特别是封闭空间的冷却效果。利用这种冷却系统来控制内外主轴单元之间的换热，基本上可以补救热变形。较少

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