Precision Machining of Fiber Reinforced Composite Materials

在用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光滑的表面，而不会产生亚表面裂纹。在本研究中，观察了加工过程中的表面生成机理，并在此基础上找到了获得良好表面的条件。本文提出了一种相对简单的测量刀具刃口锐度的方法，并用该方法定量地指出了刃口锐度对获得良好表面的重要性。主要结果如下：(1)玻璃钢加工过程中存在三种类型的表面生成。当纤维与刀具刃口接触时，可获得良好的表面质量。(2)减小未成形切屑厚度，增加刀具前倾角和倾角，以及(C)刃磨刀具刃口，可获得良好的表面。(3)周边磨削能获得较好的表面质量。(4)在使用晶须短纤维加工FRM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.