共查询到17条相似文献,搜索用时 140 毫秒
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陶瓷涂层刀具切削灰铸铁的试验研究 总被引:1,自引:0,他引:1
为了探究陶瓷涂层刀具涂层材质、基体材质对切削性能的影响,试验采用四种陶瓷涂层刀具连续干切削灰铸铁,测试了切削力和切削温度的变化情况以及后刀面的磨损量和已加工表面的粗糙度。结果表明,在刀具基体同为Si_3N_4的条件下,涂层材质为Ti N/Al_2O_3/Ti C的刀具比Ti N/Al_2O_3的切削性能好;在涂层材质同为Ti N的条件下,刀具基体Al_2O_3/Ti CN比Al_2O_3/Ti C的切削性能好。研究发现:四种陶瓷涂层刀具前刀面磨损形式均为微崩刃和月牙洼,后刀面磨损形式均为磨粒磨损和粘着磨损,涂层的磨损形式均为剥落和扩散磨损。 相似文献
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采用热压工艺制备了一种Al2O3/Ti(CN)陶瓷刀具材料,对其进行了切削性能试验,分析了其切削磨损机理并比较了三种陶瓷刀具的切削性能。试验结果表明,在切削淬硬45^#钢和铸铁时,Al2O3/Ti(CN)陶瓷刀具的耐磨性与Al2O3/TiC陶瓷刀具接近,但明显高于Al2O3/TiC/CaF2自润滑陶瓷刀具;Al2O3/Ti(CN)陶瓷刀具的后刀面磨损量随切削速度和背吃刀量的增加而增大。SEM分析发现,在切削淬硬45^#钢和铸铁时Al2O3/Ti(CN)陶瓷刀具后刀面主要磨损形式为磨粒磨损。 相似文献
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J. A. B. O. dos Santos W. F. Sales S. C. Santos A. R. Machado M. B. da Silva J. Bonney E. O. Ezugwu 《The International Journal of Advanced Manufacturing Technology》2007,31(7-8):629-637
Two PVD coated powder metallurgy high speed steel (PM-HSS) gear cutters were investigated when machining helical gears made
from AISI 19MnCr5 steel with hardness between 140 and 180 HV. Machining trials were carried out with gear cutters coated with
TiAlN (nano layers) and TiN (mono layer). Crater and flank wears were measured and analysed after all the machining trials.
Analyses of the worn tools show that the TiAlN coated gear cutter performed better than the TiN coated gear cutter. This can
be attributed to its nano layers and the higher hardness of the TiAlN coating. The dominant tool wear mechanisms were adhesion,
abrasion, delaminating of the coating layer and chipping of the cutting edge. 相似文献
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切削铸铁的刀具用新材料 总被引:3,自引:0,他引:3
介绍了选择铸铁切削用刀具需考虑的因素,可用于不同牌号铸铁的切削用刀具新材料有硬质合金刀具、陶瓷刀具、金属陶瓷刀具和超硬刀具。用于铸铁切削的整体硬质合金刀具的研究和应用成果各有两项,涂层硬质合金新材料有3种,陶瓷刀具和超硬刀具研究不多,研究最多的是金属陶瓷刀具,尤其是纳米金属陶瓷刀具材料。 相似文献
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The advanced ceramic cutting tools have very good wear resistance, high refractoriness, good mechanical strength and hot hardness. Alumina based ceramic cutting tools have very high abrasion resistance and hot hardness. Chemically they are more stable than high-speed steels and carbides, thus having less tendency to adhere to metals during machining and less tendency to form built-up edge. This results in good surface finish and dimensional accuracy in machining steels. In this paper wear behaviour of alumina based ceramic cutting tools is investigated. The machining tests were conducted using SiC whisker reinforced alumina ceramic cutting tool and Ti[C,N] mixed alumina ceramic cutting tool on martensitic stainless steel-grade 410 and EN 24 steel work pieces. Flank wear in Ti[C,N] mixed alumina ceramic cutting tool is lower than that of the SiC whisker reinforced alumina cutting tool. SiC whisker reinforced alumina cutting tool exhibits poor crater wear resistance while machining. Notch wear in SiC whisker reinforced alumina cutting tool is lower than that of the Ti[C,N] mixed alumina ceramic cutting tool. The flank wear, crater wear and notch wear are higher on machining martensitic stainless steel than on machining hardened steel. In summary Ti[C,N] mixed alumina cutting tool performs better than SiC whisker reinforced alumina cutting tool on machining martensitic stainless steel. 相似文献
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Results of laboratory cutting tests of an end-milling radius cutter of R6M5 high-speed steel with a diffusion complex coating
(C-B-N) and without coating are given. The relationship between the wear kinetics and tool life is determined. Under the accepted
test conditions, the tool life with coating is shown to be 1.6 times higher than the tool life of similar milling cutters
without coating. The higher tribological stability of the coating in the course of wear is verified by the results of electron-microscope
analysis of the worn surfaces of milling cutters. 相似文献
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WEAR PERFORMANCE OF MULTILAYER-COATED CARBIDE TOOLS 总被引:1,自引:0,他引:1
Three multilayer-coated carbides [two trigon-shaped inserts: Ti(C,N)/TiC/Al2O3 (T1), Ti(C,N)/ Al2O3/TiN (T2) and one 80°-rhomboid shaped insert: TiC/Al2O3/TiN (T3)] were used to machine a martensitic stainless steel at various combinations of cutting speed and feed rate without coolant to assess their wear performance. Significant nose wear and chipping/fracture of the cutting edge were the predominant failure modes affecting tool performance at higher speed conditions. Plucking of tool materials was the main rake face wear phenomenon observed on T1 grade insert with alumina as the top-layer coating when machining at the lower speed conditions. Attrition and plastic flow were the main wear mechanisms observed on the ceramic coating layers, with dissolution-diffusion being the probable wear mechanism of the tool grades where tungsten carbide substrate had direct contact with the flowing chip. The fitted statistical wear models revealed T3 grade insert with 80°-rhomboid shape as having the highest speed-feed capability, resulting in the highest material removal rate relative to T1 and T2 grade inserts with trigon shapes. 相似文献