Precision Machining of Fiber Reinforced Composite Materials

在用切削刀具加工纤维增强复合材料时，只有在有限的切削条件组合下才能获得无亚表面裂纹的光滑表面。在本研究中，观察了加工过程中表面生成的机理，并在此基础上找到了获得良好表面的条件。一种相对简单的方法来测量刃口锐度被开发和使用在本研究中。用该方法定量地说明了锐度对获得良好表面的重要性。主要研究结果如下：(1)玻璃钢加工过程中存在三种表面生成类型。当纤维与刀具刃口接触时，可获得良好的表面质量。(2)通过(a)减小欠成形切屑厚度，(b)增大刀具前倾角和倾斜角，(c)锐化刀具刃口，可以获得良好的表面。(3)外围铣削可获得良好的表面。(4)须短纤维FRM加工时，纤维不能被切断。

In the machining of fiber reinforced composite materials with cuttin tool, smooth surface without subsurface cracks can be obtained only under limited combination of cutting conditions. In this study, the mechanism of surface generation in the machining was observed, and, based on this observation, the conditions to get good surface were found. A relatively simple method for the measurement of cutting edge sharpness was developed and used in this study.The importance of the sharpness to get good surface was indicated quantitatively by using this method.Main results obtained are as follows: (1) Three types of surface generation exist in the machinig of GFRP. Good quality of surface is obtained when fibers are cut at the contact with the cutting edge of tool. (2) Good surface can be obtained by (a) decreasing the undercformed chip thickness , (b) increasing the rake angle and inclination angle of cutting tool, and (c) sharpening the cutting edge of tool. (3) Peripheral milling is preferable to get good surface. (4) In the machining of FRM with short fibers of whisker, fibers could not be cutoff.