共查询到18条相似文献,搜索用时 62 毫秒
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刀具涂层技术的现状与展望 总被引:27,自引:5,他引:22
综述了国内外切削刀具涂层技术的现状 ,展望了涂层技术的发展前景 ,分析了CVD和PVD工艺各自具备的优点和不足。指出 ,开发新的涂层材料和CVD、PVD两种工艺相互补充 ,可获得较理想的涂层效果 相似文献
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论文针对涂层刀具与石材加工的研究现状,提出了使用PVD涂层刀具加工天然石材。通过实验得到不同切削参数条件下切削力的变化,分析具体切削参数下刀具的磨损情况,得到了PVD涂层刀具切削天然砂岩的磨损机理及失效机理。 相似文献
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《工具技术》1984,(9)
<正> 成都工具研究所近期开发研究的刀具氮化钛物理气相沉积(PVD—physicalvapor Deposition)涂层工艺,是属于八十年代的新技术。氮化钛具有高硬度、化学稳定性较好、与被加工材料摩擦系数小等优点,一直被选用制作化学气相沉积(CVD—Chemical vaporDeposition)硬质合金涂层刀片的涂层材料。但由于CVD 涂层温度较高(900—1100℃),不适合制作涂层高速钢刀具(尤其是精密刀具),直到七十年代后期,国外研究成功刀具氮化钛PVD 涂层技术,才使涂层高速钢刀具的设想得以实现。涂层高速钢刀具的出现,被称为高速钢刀具的革命,它可成倍提高刀具寿命,并可提高切削速度30%左右。因此,在国外工具制造业中它正处于迅速发展的阶段。工具所研究的氮化钛PVD 涂层技术,系标用空心阴极电子枪反应离子沉积原理,采用与南充机器厂协作研制的刀具涂层试验设备。该技术包括:(1)刀具表 相似文献
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《工具技术》1991,(6)
<正> 硬质合金可转位刀具中,涂层刀具已占60~70%,几乎全是化学涂层(CVD)。CVD处理时,合金基体表面承受高温,抗弯强度下降50%,为防止尖崩刃和破损,需进行倒棱和钝化。物理涂层(PVD)结合强度低,涂层易剥离,未广泛使用。为克服这一缺点,新近开发了阴极电弧PVD涂层技术。下表是使用刀具与加工条件。这里的数据是各种涂层刀具的比较数据。试验刀具是Kennametal公司的K-2S和N-60,其中N-60是Multi-Are3341(即MAV32)物理涂层,K-2S是阴极电弧PVD涂层。切削试验机床为Cazenueve HB725。被加工材料为不锈钢4340。 相似文献
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The aim of this work was to investigate the potential of using hard physical vapour deposition (PVD) coatings on forming tools, as well as to determine the influence of plasma nitriding on the load-carrying capacity and wear resistance of coated tool surfaces. A load-scanning test rig was used for evaluation, where duplex treated cold work tool steel samples were loaded against soft austenitic stainless steel and hardened ball bearing steel, respectively. Four different coatings (TiN, TiB2, TaC and DLC) and two substrate treatments (hardening and plasma nitriding in two different gas mixtures) were included.Plasma nitriding alone significantly improved the friction, wear, and anti-sticking properties of the tool steel. PVD coating, and especially PVD coating of nitrided tool steel further improved the performance. Therefore, from the point of view of tool life as well as work peace surface quality, the DLC coating with its excellent anti-sticking properties and sufficiently good wear resistance represent the best solution for forming tool applications of austenitic stainless steel. 相似文献
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《Measurement》2016
Machining of Nimonic C-263 has always been a challenging task owing to its hot strength, low thermal conductivity, tendency to work harden and affinity towards tool materials. Although coated tools have been used to overcome some of these challenges, selection of coated tool with appropriate deposition technique is of immense significance. The current study attempts to comparatively evaluate various performance measures in machining of Nimonic C-263 such as surface roughness, cutting force, cutting temperature, chip characteristics, and tool wear with particular emphasis on different modes of tool failure for commercially available inserts with multi-component coating deposited using chemical vapour deposition (CVD) and physical vapour deposition (PVD) techniques. Influence of cutting speed (Vc) and machining duration (t) has also been investigated using both coated tools. The study demonstrated remarkable decrease in surface roughness (74.3%), cutting force (6.3%), temperature (13.4%) and chip reduction coefficient (22%) with PVD coated tool consisting of alternate layers of TiN and TiAlN over its CVD coated counterpart with TiCN/Al2O3 coating in bilayer configuration. Severe plastic deformation and chipping of cutting edge and nose, abrasive nose and flank wear along with formation of built-up-layer (BUL) were identified as possible mechanisms of tool failure. PVD coated tool successfully restricted different modes of tool wear for the entire range of cutting speed. Superior performance can be attributed to the hardness and wear resistance properties, thermal stability due to presence of TiAlN phase and excellent toughness owing to PVD technique and multilayer architecture. 相似文献
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K. Kadirgama K. A. Abou-El-Hossein B. Mohammad H. Habeeb 《Journal of Mechanical Science and Technology》2007,21(10):1651-1655
The aim of this study is to develop the surface roughness prediction models, with the aid of statistical methods, for hastelloy
C-22HS when machined by PVD and CVD coated carbide cutting tools under various cutting conditions. These prediction models
were then compared with the results obtained experimentally. By using response surface method (RSM), first order models were
developed with 95 % confidence level. The surface roughness models were developed in terms of cutting speed, feed rate and
axial depth using RSM as a tool of design of experiment. In general, the results obtained from the mathematical models were
in good agreement with those obtained from the machining experiments. It was found that the feed rate, cutting speed and axial
depth played a major role in determining the surface roughness. On the other hand, the surface roughness increases with a
reduction in cutting speed. PVD coated cutting tool performs better than CVD when machining hastelloy C-22HS. It was observed
that most of the chips from the PVD cutting tool were in the form of discontinuous chip while CVD cutting tool produced continuous
chips. 相似文献
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Machining process productivity and machined part quality improvement is a considerable challenge for modern manufacturing. One way to accomplish this is through the application of PVD coatings on cutting tools. In this study the wear rate and wear behavior of end milling cutters with mono-layered TiAlCrN and nano-multilayered self-adaptive TiAlCrN/WN PVD coatings have been studied under high performance dry ball-nose end-milling conditions. The material being machined in this case is hardened H13 tool steel. The morphology of the worn surface of the cutting tool has been studied using SEM/EDX. The microstructure of the cross-section of the chips formed during cutting was analyzed as well. The surface integrity of the workpiece material was also evaluated. Surface roughness and microhardness distribution near the surface of the workpiece material was also investigated. The data presented shows that achieving a high degree of tribological compatibility within the cutting tool/workpiece system can have a big impact on tool life and surface integrity improvement during end milling of hardened tool steel. 相似文献
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为了改善发动机活塞环的摩擦学性能和提高其使用寿命,采用离子镀技术在活塞环表面制备了CrN硬质膜,并利用SRV摩擦磨损试验机考察了硬质膜的摩擦学特性,研究结果表明离子镀硬质膜的摩擦系数基本与镀铬层一致,但磨损量远低于镀铬层的磨损量,与两种涂层活塞环配副的缸套试样的磨损量基本相当。 相似文献
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The use of PVD coatings in tribological applications becomes more and more widespread. Thus also the need to fully understand the relationships between the intrinsic properties of the coating, the properties of the coating/substrate composite and the tribological performance of the composite in different tribological systems becomes increasingly pressing. One of the tools available for tribological characterization of coatings and coating/substrate composites is scratch testing. In the current paper, Uppsala University presents a selection of results from many years of scratch testing of PVD coated components. Applications range from adhesion assessment and coating quality determination to estimation of coating fracture resistance. Examples in the form of scratch studies of PVD coatings on various high speed steels and tool steels - including failure mode anaiysis in situ SEM - are given. 相似文献