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针对GH901高温合金材料、06Cr19Ni10奥氏体不锈钢材料和20Cr1Mo1VNbTiB合金钢材料在精密内冷却和外冷却方式下进行的刀具失效形式及刀具寿命对比车削试验发现,相较于常规外冷却车削,精密内冷方式的刀具寿命有较大幅度提升,车削GH901材料可以提升48.93%刀具寿命,车削06Cr19Ni10材料能提升34.73%刀具寿命,车削20Cr1Mo1VNbTiB材料能提升28.57%刀具寿命;在连续切削工况下进行车削试验,刀具失效方式为后刀面磨损。 相似文献
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车削0Cr18Ni9不锈耐热钢的刀具优选试验 总被引:1,自引:0,他引:1
分别采用YT15、YW2、YG6X硬质合金刀具和Fe-Al/Al2O3金属陶瓷刀具进行0Cr18Ni9不锈耐热钢的车削试验,进行刀具材料的优选。试验结果显示:切削速度较低时,YG6X和YW2刀具的耐用度和表面质量较好;切削速度较高时,Fe-Al/Al2O3陶瓷刀具的耐用度较好。 相似文献
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通过水热法制备粒度均匀的Al2O3/La2O3/(W,Mo)C纳米复合粉体,采用放电等离子烧结技术制备Al2O3/La2O3/(W,Mo)C无黏结相硬质合金刀具,利用激光加工技术在刀具表面制备不同沟槽参数的表面微织构,采用正交试验法研究不同沟槽参数的刀具对钛合金干切削性能的影响。结果表明:沟槽间距对切削力和粗糙度影响最大,沟槽深度次之,沟槽宽度影响最小;Al2O3/La2O3/(W,Mo)C无黏结相刀具在沟槽深度为10 μm、沟槽间距为100 μm、沟槽宽度为30 μm时,对TC4钛合金切削性能最好,且刀具前刀面无磨损,后刀面为边界磨损,沟槽织构有效抑制了月牙洼磨损,提高了刀具寿命。 相似文献
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用YG6X、YW2、Fe-Al/Al2O3陶瓷刀具对ZG30Cr20Ni10奥氏体耐热钢进行了车削试验研究,得出了切削用量对加工表面粗糙度的影响规律。 相似文献
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高合金不锈钢具有强度高、韧性好、耐腐蚀等优良性能而得到日益广泛的应用,但是其难加工性同时也对切削技术提出了更高的要求.干切削因具有对环境和人体无害、经济性好等优点成为金属加工技术的主要发展方向之一.文中对高合金不锈钢Y12Cr17和16Cr17Ni3的干车削和近干车削中,切削参数和切削材料对刀具磨损和工件表面质量的影响进行了深入研究.结果表明,通过选择适当的切削参数、刀具材料以及刀具涂层,可以很好地实现高合金不锈钢的干车削加工,并能获得比传统乳化剂加工更小的磨损值和更好的工件表面质量. 相似文献
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In present work performance of coated carbide tool was investigated considering the effect of work material hardness and cutting parameters during turning of hardened AISI 4340 steel at different levels of hardness. The correlations between the cutting parameters and performance measures like cutting forces, surface roughness and tool life, were established by multiple linear regression models. The correlation coefficients found close to 0.9, showed that the developed models are reliable and could be used effectively for predicting the responses within the domain of the cutting parameters. Highly significant parameters were determined by performing an Analysis of Variance (ANOVA). Experimental observations show that higher cutting forces are required for machining harder work material. These cutting forces get affected mostly by depth of cut followed by feed. Cutting speed, feed and depth of cut having an interaction effect on surface roughness. Cutting speed followed by depth of cut become the most influencing factors on tool life; especially in case of harder workpiece. Optimum cutting conditions are determined using response surface methodology (RSM) and the desirability function approach. It was found that, the use of lower feed value, lower depth of cut and by limiting the cutting speed to 235 and 144 m/min; while turning 35 and 45 HRC work material, respectively, ensures minimum cutting forces, surface roughness and better tool life. 相似文献
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Measuring procedures of cutting edge preparation when hard turning with coated ceramics tool inserts
《Measurement》2014
In this paper, the authors introduce the methodology of combined studies on cutting edge preparation and tool performance testing. Five main fields of research on cutting edge preparation are identified in this study of cutting edge preparation while cutting edge microgeometry consists of data associated with tool edge and rake face. Uncoated and TiN coated mixed oxide ceramics inserts have been tested concerning their microgeometry and wear resistance and there is presented a sequence of measuring to identify cutting edge preparation and properties of coating. Authors propose the sequence which considers cutting edge preparation as a factor controlling performance of cutting edge in hard turning operations. Four steps in the sequence of performance testing include measurements with effects of wear criterion and machining time. Measured results show that combined effects of both preparation and coating reduce considerably friction forces in scratch tests and there is very negligible change of microhardness of uncoated and coated ceramics. Relationships between cutting edge microgeometry and acceptable machined surface roughness which results from the sequence in tool performance testing have been identified. Finally, tool performance indices are based on units which characterize machined surface roughness, tool edge wear and forces when hard turning. 相似文献
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T. J. Ko H. S. Kim 《The International Journal of Advanced Manufacturing Technology》2001,18(3):168-175
Despite the large amount of research on hard turning, there are few results on intermittent hard turning. In this paper, the
feasibility of internal intermittent hard turning has been investigated. First, the cutting tools with different cubic boron
nitride (CBN) contents were evaluated, based on machineability: tool wear, surface roughness, and cutting forces. In the case
of intermittent turning, low CBN content tools had better machineability than high CBN content tools. The depth of the machining
damaged layer and the magnitude and distribution of residual stress were evaluated. The experimental results showed that intermittent
hard turning can produce surface integrity which is good enough for replacing the grinding process. 相似文献
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Yusuf Özçatalbaş 《Machining Science and Technology》2013,17(4):626-637
□ In conventional metal cutting process, materials are assumed to be homogeneous and isotropic structure. However, some materials with a single crystal or coarse elongated polycrystalline demonstrate strong anisotropic behavior in physical and mechanical properties in machining of some superalloy materials. The anisotropic structure always leads to variation at machinability properties of the material. In this study, machinability properties of ferritic superalloy PM2000, which had elongated a few coarse grains, were investigated. These properties were determined by investigation of chip formation, cutting forces and surface roughness. Machinability was assessed by single-point turning on a CNC lathe and turning forces were measured by using a Kistler Lathe Dynamometer. The chip formation mechanisms in machining of PM2000 at various cutting speeds were determined by using a quick-stop device (QSD). Chip roots and machined surfaces were analyzed by means of scanning electron microscopy (SEM). The results indicated that the machinability properties of the PM2000 were changed by orientated coarse grain structure. Three types chip formation mechanism were determined at the same cutting conditions. Also, surface roughness on the machined each grain changed with changing the grain to be cut. Surface roughness and force fluctuations decreased with increasing the cutting speed; however, tool wearing increased. 相似文献
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Samir Khamel Nouredine Ouelaa Khaider Bouacha 《Journal of Mechanical Science and Technology》2012,26(11):3605-3616
The main of the present study is to investigate the effects of process parameters (cutting speed, feed rate and depth of cut) on performance characteristics (tool life, surface roughness and cutting forces) in finish hard turning of AISI 52100 bearing steel with CBN tool. The cutting forces and surface roughness are measured at the end of useful tool life. The combined effects of the process parameters on performance characteristics are investigated using ANOVA. The composite desirability optimization technique associated with the RSM quadratic models is used as multi-objective optimization approach. The results show that feed rate and cutting speed strongly influence surface roughness and tool life. However, the depth of cut exhibits maximum influence on cutting forces. The proposed experimental and statistical approaches bring reliable methodologies to model, to optimize and to improve the hard turning process. They can be extended efficiently to study other machining processes. 相似文献
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Tugrul Özel Tsu-Kong Hsu Erol Zeren 《The International Journal of Advanced Manufacturing Technology》2005,25(3-4):262-269
In this study, the effects of cutting edge geometry, workpiece hardness, feed rate and cutting speed on surface roughness and resultant forces in the finish hard turning of AISI H13 steel were experimentally investigated. Cubic boron nitrite inserts with two distinct edge preparations and through-hardened AISI H13 steel bars were used. Four-factor (hardness, edge geometry, feed rate and cutting speed) two-level fractional experiments were conducted and statistical analysis of variance was performed. During hard turning experiments, three components of tool forces and roughness of the machined surface were measured. This study shows that the effects of workpiece hardness, cutting edge geometry, feed rate and cutting speed on surface roughness are statistically significant. The effects of two-factor interactions of the edge geometry and the workpiece hardness, the edge geometry and the feed rate, and the cutting speed and feed rate also appeared to be important. Especially honed edge geometry and lower workpiece surface hardness resulted in better surface roughness. Cutting-edge geometry, workpiece hardness and cutting speed are found to be affecting force components. The lower workpiece surface hardness and honed edge geometry resulted in lower tangential and radial forces. 相似文献
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Leonardo R. Silva J. Paulo Davim António Festas A. M. Abrão 《The International Journal of Advanced Manufacturing Technology》2009,41(9-10):839-845
This paper aims to study the behavior of machining forces and machined surface finish when micro-turning PA66-GF30-reinforced polyamide with various tool materials under distinct cutting conditions. The performance of polycrystalline diamond (PCD), CVD diamond coated carbide and plain cemented carbide tools (K15-KF and K15) were investigated in addition to the influence of feed rate on cutting forces, surface roughness and chip formation. The results indicated that the radial force was the highest force component because of the reduction in the effective cutting edge angle. Moreover, the cutting force increased almost linearly with feed, whereas the feed and radial forces remained unaltered. The cutting tools possessing lower edge radius promoted lower surface finish and turning forces, i.e., the best results were provided by the PCD tool, followed by the uncoated carbide inserts and finally by the CVD diamond-coated carbide tool. 相似文献
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The induction-heated tool and cryogenically cooled workpiece are investigated for end milling of elastomers to generate desirable shape and surface roughness. Elastomer end milling experiments are conducted to study effects of the cutting speed, tool heating, and workpiece cooling on the chip formation, cutting forces, groove width, and surface roughness. At high cutting speed, smoke is generated and becomes an environmental hazard. At low cutting speeds, induction heated tool, if properly utilized, has demonstrated to be beneficial for the precision machining of elastomer with better surface roughness and dimensional control. Frequency analysis of cutting forces shows that the soft elastomer workpiece has low frequency vibration, which can be correlated to the surface machining marks. The width of end-milled grooves is only 68 to 78% of the tool diameter. The correlation between the machined groove width and cutting force reveals the importance of the workpiece compliance to precision machining of elastomer. This study also explores the use of both contact profilometer and non-contact confocal microscope to measure the roughness of machined elastomer surfaces. The comparison of measurement results shows the advantages and limitations of both measurement methods. 相似文献
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The present work deals with some machinability studies on flank wear, surface roughness, chip morphology and cutting forces in finish hard turning of AISI 4340 steel using uncoated and multilayer TiN and ZrCN coated carbide inserts at higher cutting speed range. The process has also been justified economically for its effective application in hard turning. Experimental results revealed that multilayer TiN/TiCN/Al2O3/TiN coated insert performed better than uncoated and TiN/TiCN/Al2O3/ZrCN coated carbide insert being steady growth of flank wear and surface roughness. The tool life for TiN and ZrCN coated carbide inserts was found to be approximately 19 min and 8 min at the extreme cutting conditions tested. Uncoated carbide insert used to cut hardened steel fractured prematurely. Abrasion, chipping and catastrophic failure are the principal wear mechanisms observed during machining. The turning forces (cutting force, thrust force and feed force) are observed to be lower using multilayer coated carbide insert in hard turning compared to uncoated carbide insert. From 1st and 2nd order regression model, 2nd order model explains about 98.3% and 86.3% of the variability of responses (flank wear and surface roughness) in predicting new observations compared to 1st order model and indicates the better fitting of the model with the data for multilayer TiN coated carbide insert. For ZrCN coated carbide insert, 2nd order flank wear model fits well compared to surface roughness model as observed from ANOVA study. The savings in machining costs using multilayer TiN coated insert is 93.4% compared to uncoated carbide and 40% to ZrCN coated carbide inserts respectively in hard machining taking flank wear criteria of 0.3 mm. This shows the economical feasibility of utilizing multilayer TiN coated carbide insert in finish hard turning. 相似文献