Laser Technology - Applications in Adhesion and Related Areas
Laser Technology - Applications in Adhesion and Related Areas
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激光技术 - 在粘合及相关领域的应用
DOI：
10.1002/9781119185031.ch9
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Marimuthu S
中科院分区：
文献类型：
--
作者：
Marimuthu S
目前迫切需要减少产品和制造过程的环境足迹，并支持可持续的材料消费。对于工程应用，这意味着需要开发利用延长使用寿命的工具的低能源/碳足迹制造工艺。在机械加工中，氮化钛(TiN)、钛铝氮化物(TiAlN)、铬钛铝氮化物(CrTiAlN)等纳米硬质陶瓷薄膜被广泛应用于提高加工能力和延长刀具寿命。但是，如果在涂层工具上检测到任何错误，或当工具需要重新使用时，必须移除现有涂层，以便于重塑/重新涂层。现有的涂层去除方法使用的是化学腐蚀方法，这种方法不环保，也不适合选择性去除涂层。本章讨论了准分子激光去除硬质陶瓷涂层的发展，并证明了它是现有化学腐蚀方法的一种可行的替代方法。为了提高译码过程的完整性，使译码过程更加准确可靠，讨论了探测束反射(PBR)和激光羽流发射光谱(LPES)两种在线监测系统。该在线监测系统便于涂层去除的预测，并确保更好地控制激光消光过程，以避免涂层去除不足或基材损坏。还详细讨论了激光译码刀具与化学译码刀具在实际加工中的性能比较。一种比较
There is an urgent and growing need to reduce the environmental footprints of products and manufacturing processes and to support sustainable material consumption. For engineering applications, this implies the need to develop low energy/carbon footprint manufacturing processes that utilise extended-life tooling. In mechanical machining, nanostructured hard ceramic thin film coatings like titanium nitride (TiN), titanium aluminium nitride (TiAlN) and chromium titanium aluminium nitride (CrTiAlN) are extensively used to improve machining capability and to extend the lives of cutting tools. However, if any error is detected on the coated tools or when the tooling needs to be re-used, it is mandatory to remove the existing coating to facilitate reshaping/recoating. Existing coating removal processes use chemical etching methods, which are not environmentally friendly and also not suitable for selective coating removal. This chapter discusses the developments in excimer laser removal of hard ceramic coatings and demonstrates it as a viable alternative to existing chemical etching methods. In order to raise the integrity of the decoating process and to make the process more accurate and reliable, two online monitoring systems, exploiting probe beam reflection (PBR) and laser plume emission spectroscopy (LPES) are discussed. The online monitoring system facilitates the prediction of coating removal and ensures better control over the laser decoating process so as to avoid under-removal of the coating or damage of the substrate. Also discussed in detail is the performance of laser decoated tool in actual machining, compared to that of chemically decoated tools. A comparison of