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Usinage en detourage de lamines composites carbone/epoxy.

机译：碳/环氧复合材料层压板的开孔加工。

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摘要

The post manufacturing by machining of composites parts is becoming much more usual. The aim of this study is to define the performance of existing cutting tools for composites, in order to suggest the best choices and the optimal cutting conditions for the trimming process of carbon fibres reinforced plastics (CFRP). The evaluation is based on the cutting forces and the surface quality produced through the trimming process. A systemic approach, using weighting factors, is proposed to help the end user for the performance evaluation of the cutters based on its production environment. This work also describes a design of experiments to determine the geometrical parameters which influence the performance of the cut with the objective to design more efficient cutting tools.;For both aspects, the research method used includes the development of a classic design of experiments with multiple factors. The factors discussed are the cutting parameters, the thickness of quasi-isotropic laminated carbon / epoxy material and the different types of cutting tool materials. The data acquisition is done using a dynamometric table for the force evaluation, a profilometer for the surface roughness evaluation as well as optical microscopes for the surface integrity estimation. It is found that the cutting forces in the direction of feed is proportional to the feed rate, while cutting forces in the axial direction and normal to the machined surface are proportional to the cutting speed and feed rate. Of the four tool types analyzed, the tool C4 with inserts of PCD is the best performing tool evaluated by the method of weighting factors in the equation of the performance index. As part of this work, a comprehensive analysis of the roughness was made and the main results obtained show that the roughness is dependent on cutting parameters and fiber orientation. Composites with fibers oriented at 0 degree have the best surface roughness and those fiber with a -45 degrees orientation have the worst surface roughness for the same cutting parameters and the same tool.;The cutting tools should have positive rake angle for their cutting edges with a value ranging between 8 to 10 degrees and have a coating able to withstand the abrasiveness of carbon fibers.;Two recommendations are made in the context of this work for the continuity of this research. The first recommendation is to evaluate the tool wearing due to the trimming process with the best cutting tools proposed in order to determine the cost per length of machining for each of these. This performance index has to be evaluated since it is directly related to the final choice of a best cutting tool. The second recommendation is to manufacture new cutting tools based on the optimal geometric parameters proposed in this study and evaluate their performance as compared to the other tools tested in this work.
机译：通过加工复合材料零件进行后期制造变得越来越普遍。这项研究的目的是定义现有的复合材料切割工具的性能，以便为碳纤维增强塑料（CFRP）的修整过程提供最佳选择和最佳切割条件。评估基于切削力和修整过程中产生的表面质量。提出了一种使用加权因子的系统方法，以帮助最终用户根据其生产环境评估刀具的性能。这项工作还描述了一种实验设计，以确定影响切割性能的几何参数，目的是设计更高效的切割工具。在这两个方面，所使用的研究方法都包括开发经典的实验设计，其中包括多个因素。讨论的因素包括切削参数，准各向同性层压碳/环氧材料的厚度以及不同类型的切削工具材料。数据采集​​使用测力表进行力评估，使用轮廓仪进行表面粗糙度评估，并使用光学显微镜进行表面完整性评估。发现在进给方向上的切削力与进给速度成正比，而在轴向方向上和垂直于机加工表面的切削力与切削速度和进给速度成正比。在所分析的四种工具类型中，带有PCD刀片的工具C4是通过性能指数方程式中的加权因子方法评估的性能最佳的工具。作为这项工作的一部分，对粗糙度进行了综合分析，获得的主要结果表明，粗糙度取决于切削参数和纤维取向。在相同的切削参数和相同的刀具下，纤维取向为0度的复合材料具有最佳的表面粗糙度，而-45度取向的纤维具有最差的表面粗糙度;切削刀具的切削刃应具有正前角值范围在8到10度之间，并具有能够承受碳纤维磨蚀性的涂层。;在本研究的背景下，为继续研究，提出了两项​​建议。第一条建议是使用建议的最佳切削刀具评估由于修整过程而引起的刀具磨损，以确定每种刀具的每单位加工长度的成本。必须评估该性能指标，因为它与最佳切削工具的最终选择直接相关。第二项建议是根据本研究中提出的最佳几何参数制造新的切削刀具，并与本工作中测试的其他刀具相比，评估其性能。

著录项

  • 作者

    Berube, Sebastien.;

  • 作者单位

    Ecole de Technologie Superieure (Canada).;

  • 授予单位 Ecole de Technologie Superieure (Canada).;
  • 学科 Mechanical engineering.;Aerospace engineering.
  • 学位 M.Eng.
  • 年度 2012
  • 页码 214 p.
  • 总页数 214
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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