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刘凯 《机械制造与自动化》2013,42(1):63-65
介绍了干式切削加工技术的优点及发展趋势,分析了干式切削刀具技术及金刚石涂层刀具的性能特点.通过铝硅合金的干式切削试验,研究了金刚石涂层刀具的干式切削加工特性.经试验表明,金刚石涂层刀具正常磨损阶段,工件表面粗糙度非常稳定;刀具损坏以涂层脱落为主,刀具寿命取决于涂层与机体的结合强度;进给量对工件表面粗糙度影响最大,如果进给量合适,可以保证金刚石涂层刀具在高速下具有良好的干式切削性能. 相似文献
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金刚石涂层刀具高速铣削石墨的磨损形态与破损机理 总被引:2,自引:0,他引:2
通过对比切削试验,分析了金刚石涂层刀具高速铣削石墨时的磨损形态与过程,论述了金刚石涂层刀具的破损原因与失效机理,为金刚石涂层刀具在高速切削领域的推广应用提供了实用的依据。 相似文献
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为研究天然理石切削过程中刀具切削力与切削质量变化特性,利用CVD金刚石薄膜涂层刀具和未涂层硬质合金刀具进行高效铣削实验。基于刀具-工件几何接触关系,推导铣削力数学模型,分析不同类型刀具切削力、工件表面粗糙度随切削参数和切削时间变化特性。研究表明:金刚石涂层刀具切削力明显小于未涂层硬质合金刀具,2种类型刀具的切削力随切削参数的变化特征基本相同;随着切削时间的增加,刀具切削力变化分为4个阶段:初始磨合阶段、稳定阶段、过渡阶段和刀具磨损加剧阶段。金刚石涂层刀具切削磨合期和稳定期持续时间为未涂层刀具的3.5倍,切削力和工件表面粗糙度变化比较平稳;未涂层刀具切削平稳期持续时间很短,切削力增长趋势明显,且在切削力增长后期工件表面粗糙度达到2.5μm。 相似文献
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通过用CVD金刚石薄膜涂层刀具切削加工SiC颗粒增强基复合材料的试验,研究了切削参数、刀具材料、刀具几何参数和工件材料对CVD金刚石薄膜涂层刀具磨损的影响规律,同时研究SiCp/Al复合材料的切削加工性能。 相似文献
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类金刚石(Diamond-Like Carbon,DLC)涂层刀具结合了基体强度高、韧性好以及涂层硬度高、耐磨性高的优点,可以有效降低刀-屑间摩擦,提高刀具切削寿命和加工效率。采用直流磁控溅射和等离子体辅助化学气相沉积(Plasma-Assisted Chemical Vapor Deposition,PACVD)法分别在硬质合金刀具基体上制备了单一DLC涂层、Cr/W-DLC/DLC复合涂层和Cr/CrN/DLC复合涂层。对比研究了具有不同Cr/x/DLC过渡层的DLC复合涂层硬质合金刀具加工过共晶结构铝硅合金AC9B的切削性能。研究结果表明:切削铝硅合金时,相对于无涂层硬质合金刀具,DLC涂层硬质合金刀具可以明显降低切削力和切削温度,并且具有更长的刀具切削寿命;Cr/W-DLC/DLC复合涂层硬质合金刀具的切削力最小,切削寿命最长。经显微分析,发现DLC涂层硬质合金刀具切削铝硅合金时的磨损机理主要是黏结磨损和硬质点磨损。 相似文献
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Elliptical vibration cutting of hardened die steel with coated carbide tools is examined in this research in order to achieve low-cost high-precision machining. Diamond coated tools are applied because of superior hardness of their polycrystalline diamond coating and its low manufacturing cost. TiN coated tools are also tested, since they are widely used for conventional machining of steels. Machinability of hardened die steel by the elliptical vibration cutting with coated carbide tools is discussed in three aspects in this study, i.e. transferability of cutting edge profile to cut surface, cutting force, and tool life. The transferability is evaluated quantitatively by calculating correlation coefficients of measured roughness profiles. It is clarified that the diamond coated tools have high transferability which leads to diffraction of light on the surface machined at micro-scale pick feed. Total cutting forces including ploughing components are measured at various feed rates, and then shearing components and ploughing components are separated utilizing linear regression. The measured results indicate, for example, that the all forces become considerably smaller only when elliptical vibration is applied to the TiN coated tool without cutting fluid. It is also found that this considerable reduction of forces interestingly corresponds to higher friction coefficient, which is identified from the ploughing components. Tool life tests are carried out by various machining methods, i.e. elliptical vibration/ordinary wet/dry cutting with diamond/TiN coated tools. The result shows, for example, that the flank wear is smallest in the wet elliptical vibration cutting with the diamond coated tool. 相似文献
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0 INTRODUCT[ONDiamond is a kind Of excellent cutting tool material for cutting non-fermus metal and nonmetallicmaterials. Because of the limited supply and high cost of natural diamond it has been mainly used forspecial aPPlications Where no other tools can Perform satisfactorily.The study of dePOsition of diamond film on cutting tools and its wide aPPlications began in 1980.Great Progress has been made at the same time. The [ypical principles used in coated-cutting tool are thehacrow… 相似文献
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金刚石薄膜涂层刀具失效预报 总被引:2,自引:0,他引:2
金刚石薄涂层刀具失效主要形式是膜剥落或膜磨穿。切削过程中刀具金刚石薄膜失效时,会产生积屑瘤,且切削力骤然增大,通过监测积屑瘤的产生和切削力的变化,可以预报金刚石薄膜涂层刀具的失效。 相似文献