Material removal characteristics of metal-polymer composites in the cutting process
Material removal characteristics of metal-polymer composites in the cutting process
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DOI：
10.1007/s10965-023-03554-4
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发表时间：
2023-04
影响因子：
2.8
通讯作者：
Ying Yan;Bo Li;Yujiang Sun;Jiyang Su;Ping Zhou
中科院分区：
文献类型：
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作者：
Ying Yan;Bo Li;Yujiang Sun;Jiyang Su;Ping Zhou
由于具有一些不可替代和可调节的性能，如热物理、摩擦学或机械性能，金属聚合物复合材料不断被开发并应用于多种用途。金属和聚合物材料之间的机械和导热性差异导致其去除行为与传统均质材料不同。提高加工表面质量成为扩大其应用领域亟待解决的问题。在这项工作中，研究了铜颗粒填充的聚四氟乙烯复合材料（Cu/PTFE）材料在切削过程中的材料去除特性。应用动态机械分析（DMA）实验来研究温度如何影响 Cu/PTFE 材料的机械特性。然后通过模拟和实验研究了材料去除机理。结果表明，Cu/PTFE 材料同时存在三种去除模式，具体取决于颗粒相对于切削刃的位置和切削温度。一个重要的发现是，实际粗糙度与基于刀具包络模型的理论粗糙度之间的差异与切削温度线性相关。这主要是由于储能模量随温度近似线性下降。随着温度升高，材料的储能模量呈现下降趋势，并且在玻璃化转变温度下的机械损失也较差。本文揭示的切削 Cu/PTFE 表面的材料去除特性及其潜在机制对于确定加工参数以提高表面质量具有指导意义。
Metal-polymer composites are constantly developed and applied for numerous purposes due to some irreplaceable and adjustable properties like thermophysical, tribological or mechanical. The differences of mechanical and thermal conductivity between metal and polymer materials lead to different removal behaviors from traditional homogeneous materials. The improvement of machining surface quality becomes an urgent problem to be solved in expanding its application. In this work, material removal characteristics of copper particle-filled PTFE composites (Cu/PTFE) material in cutting process were investigated. Dynamic mechanical analysis (DMA) experiments were applied to investigate how the temperature affected the mechanical characteristics of the Cu/PTFE materials. Then the material removal mechanism was studied by simulation and experiment. The results revealed that there are three simultaneously exist removal modes of the Cu/PTFE material, depending on the position of the particles relative to the cutting edge and the cutting temperature. An important finding is that the difference between the actual roughness and the theoretical roughness based on the tool envelope model is linearly related to the cutting temperature. This is mainly due to the approximately linear decrease of the storage modulus with temperature. With rising temperature, the material’s storage modulus exhibited a tendency to decrease and a poorer mechanical loss at glass transition temperature was also certificated. The material removal characteristics of the cutting Cu/PTFE surface and its underlying mechanism revealed in this paper are instructive for determining the machining parameters to improve the surface quality.