共查询到20条相似文献,搜索用时 203 毫秒
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采用聚晶立方氮化硼(PCBN)、TiAlN涂层硬质合金(2种刀尖圆弧半径)和Al_2O_3+TiC涂层硬质合金等3种刀具车削TC4钛合金工件,测试了刀具后刀面磨损宽度和工件表面粗糙度,观察了刀具的磨损形貌并分析了磨损机制;同时,研究了刀尖圆弧半径对工件表面粗糙度和切屑形貌的影响。结果表明:TiAlN涂层硬质合金刀具具有比其他2种刀具更长的使用寿命,且加工后工件的表面粗糙度最小、表面质量最好,其磨损形式主要为磨粒磨损和黏结磨损;PCBN刀具的失效形式主要为前刀面和后刀面崩塌,而Al_2O_3+TiC涂层硬质合金刀具的磨损形式主要为扩散磨损;刀尖圆弧半径的增大有利于提高TiAlN涂层硬质合金刀具的断屑能力以及加工工件的表面质量。 相似文献
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采用未涂层和CVD金刚石薄膜涂层两种硬质合金铣刀,对碳纤维复合材料进行铣削试验,使用3D激光扫描镜对刀具磨损形貌和磨损量进行测量,分析了刀具的磨损机理和切削用量对刀具磨损的影响。试验结果表明:后刀面磨损是两种刀具的主要磨损形式,磨损机理为磨料磨损,未涂层硬质合金铣刀同时存在着刀具破损现象;切削速率和背吃刀量对刀具后刀面的磨损影响较为显著;未涂层与CVD金刚石薄膜涂层硬质合金铣刀相比较,后刀面的磨损量保持在2.3—3.8倍之间,从刀具的耐磨性考虑,CVD金刚石薄膜涂层硬质合金铣刀可以用于碳纤维复合材料的生产加工。 相似文献
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研究并比较了TiAlN和TiN涂层的成分、微结构、力学性能与抗氧化性及涂层铣刀的高速切削性能和涂层钻头的切削性能。结果表明,TiAlN和TiN涂层同为单相的NaCl型结构,并都呈现择优取向的柱状晶,TiAlN涂层的硬度远高于TiN涂层的硬度,TiAlN涂层的抗氧化温度明显高于TiN涂层的抗氧化温度。在高速铣削条件下,TiAlN涂层铣刀的后刀面磨损速率仅为TiN涂层铣刀的约四分之一。在钻孔数相同时TiAlN涂层钻头的磨损量也显著低于TiN涂层钻头。TiAlN涂层刀具的使用寿命显著高于TiN涂层刀具。 相似文献
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超声振动铣削碳纤维复合材料刀具磨损研究 总被引:1,自引:1,他引:0
采用超声振动铣削和普通铣削对硬质合金铣刀铣削碳纤维复合材料进行试验研究。试验结果表明,在两种加工方式下,刀具的磨损形式主要是后刀面磨损、前刀面磨损和刀刃的破损,其中后刀面的磨粒磨损最严重,前刀面的粘着磨损较弱,当进给量加大或者是主轴转速过高时,很容易发生崩刃。超声振动条件下,刀具的后刀面磨损和前刀面磨损均较弱,且呈现一定的规律性,刀具的耐用度高,相对于普通切削更适合于复合材料的加工。 相似文献
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张毅 《精密制造与自动化》2010,(2):13-15
介绍了采用超声振动铣削和普通铣削对硬质合金铣刀铣削碳纤维复合材料进行试验研究.试验结果表明,在两种加工方式下,刀具的磨损形式主要是后刀面磨损,前刀面磨损和刀刃的破损,其中后刀面的磨粒磨损最严重,前刀面的粘着磨损较弱,当进给量加大或者是主轴转速过高时,很容易发生崩刃.超声振动条件下,刀具的后刀面磨损和前刀面磨损均较弱,且呈现一定的规律性.刀具的耐用度高,相对于普通切削更适合于复合材料的加工. 相似文献
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针对AISI 4340合金结构钢难加工的特点,选用PVD硬质合金涂层刀具进行高速干铣削试验,选用扫描电子显微镜(SEM)观察失效刀具表面的磨损形貌特征,选用能谱分析仪(EDS)分析磨损刀具表面的元素分布及含量,揭示刀具的磨损机理。研究结果表明:刀具寿命与切削参数选取有关,随着切削速度的增加,刀具磨损加快,刀具寿命降低。硬质合金涂层刀具的主要磨损形式是前刀面磨损和后刀面磨损,前刀面磨损机理主要是粘结磨损、涂层剥落、切削刃微崩刃;后刀面磨损机理主要是磨粒磨损、粘结磨损、扩散磨损、微裂纹。 相似文献
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微细铣削加工刀具磨损数值模拟的研究 总被引:2,自引:1,他引:1
采用商业有限元DEFORM-3D软件,建立了三维微细铣削加工模型,利用该模型动态模拟了硬质合金微径铣刀铣削加工2A12工件时刀具的磨损变化形态。结果表明,与常规刀具磨损形态不同,微径铣刀的磨损主要发生在刀尖处,后刀面磨损形态为近似三角形。针对这一特点,提出利用后刀面刀尖处的最大磨损高度hmax判断微径铣刀磨损量的方法,研究铣削方式对刀具磨损量影响的变化规律。仿真结果可用于预测刀具磨损变化规律,为微细铣削加工参数的优化、微径铣刀的合理选用、设计及进一步有效控制刀具磨损提供研究手段。 相似文献
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In this study different specimens of ductile cast iron with tensile strength ranking from 400 MPa to 675 MPa were turned with K15 carbide, TiN coated and TiAlN coated tool in order to investigate wear mechanism and performance. Cutting forces and cutting temperature were similar for both coated tools, however flank wear and BUE were the lowest on the TiAlN coated tool, for this reason the TiAlN coated tool is suitable in the machining of ductile cast iron. The proposed tool wear mechanism is based on like-intermittent cutting caused by the pass from hard matrix to the soft graphite occasioning wear by adhesion. The analysis of the flank wear on coated tools is proposed by means of the wear curves in logarithmic scale instead of the usual linear scale. In this way, the change in wear rate is easily observed. This phenomenon was related with the wear out of the coating layer. The partial loss of the coating layer on cutting edge was confirmed by the EDS mapping images and SEM photographs. 相似文献
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Junzhan Hou Wei Zhou Hongjian Duan Guang Yang Hongwei Xu Ning Zhao 《The International Journal of Advanced Manufacturing Technology》2014,70(9-12):1835-1845
Tool wear is one of the most important problems in cutting titanium alloys due to the high-cutting temperature and strong adhesion. Recently, the high-speed machining process has become a topic of great interest for titanium alloys, not only because it increases material removal rates, but also because it can positively influence the properties of finished workpiece. However, the process may result in the increase of cutting force and cutting temperature which will accelerate tool wear. In this paper, end milling experiments of Ti-6Al-4V alloy were conducted at high speeds using both uncoated and coated carbide tools. The obtained results show that the cutting force increases significantly at higher cutting speed whether the cutter is uncoated carbide or TiN/TiAlN physical vapor deposition (PVD)-coated carbide. For uncoated carbide tools, the mean flank temperature is almost constant at higher cutting speed, and no obvious abrasion wear or fatigue can be observed. However, for TiN/TiAlN PVD-coated carbide tools, the mean flank temperature always increases as the increase of cutting speed, and serious abrasion wear can be observed. In conclusion, the cutting performance of uncoated inserts is relatively better than TiN/TiAlN PVD-coated inserts at a higher cutting speed. 相似文献
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Titanium alloys are difficult-to-machine materials because of their poor machinability characteristics. Machining and machining performance evaluation for such materials is still a challenge. Individual machining performance indices like cutting forces, cutting energy and tool wear lead to ambiguous understanding. In this work, a Cumulative Performance Index (CPI) is defined which amalgamates non-dimensional forms of specific cutting energy, back force and average principal flank wear in turning. The CPI focuses upon simultaneous minimization of specific cutting energy, dimensional deviation and average principal flank wear. The defined index is then used to evaluate performance of five commercially available physical vapor deposited (PVD) TiAlN coated tungsten carbide/cobalt inserts vis-à-vis uncoated tungsten carbide/cobalt insert in turning of Ti-6Al-4V. Cutting forces were monitored during turning and tool wear was measured after turning experiments. The results showed that the performance of coated inserts was either comparable or poor than uncoated insert; and in no case, coated inserts performed better than uncoated insert. Although commercial recommendations are in place to use PVD coated inserts for enhanced machinability of titanium alloys, the use of coated inserts is not justified keeping in view the energy spent in coating and insignificant improvement in performance. 相似文献
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This paper presents the results of an experimental investigation on the wear mechanisms of uncoated tungsten carbide (WC) and coated tools (single-layer (TiAlN) PVD, and triple-layer (TiCN/Al2O3/TiN) CVD) in oblique finish turning of Inconel 718. Tool wear rate and wear mechanisms were evaluated for cutting speeds, 50<V<100 m/min, and feed rates, 0.075<f<0.125 mm/rev, at a constant depth of cut of 0.25 mm. It was concluded that abrasive and adhesive wear were the most dominant wear mechanisms, controlling the deterioration and final failure of the WC tools. While the triple layer CVD coated tools exhibited the highest wear resistance at high cutting speeds and low feeds, uncoated tools outperformed the single and multi-layer coated tools in the low range of cutting speeds and intermediate feeds. The cutting tool with single-layer PVD coating outperformed the other tools at the medium cutting speed. 相似文献
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为了研究不同涂层刀具切削淬硬H13钢的切削性能,进行了多层Ti化合物涂层、TiAlN涂层以及MTTiCN厚Al_2O_3TiN涂层材料刀具车削加工淬硬H13钢试验,分析了不同的涂层材料刀具与切削力、切削温度、涂层刀具磨损以及刀具寿命的关系。研究得出:多层Ti化合物涂层刀具受到三个方向的力都大于其它两种涂层的刀具,而且切削温度最高;用TiAlN涂层刀具切削时温度最低;切削过程中三种刀具后刀面磨损程度不同,发现多层Ti化合物涂层刀具磨损最为严重,寿命最短;MT-TiCN厚Al_2O_3Ti N涂层材料刀具比多层Ti化合物涂层刀具寿命长30%;TiAlN涂层刀具的切削寿命最长比多层Ti化合物涂层刀具寿命长45%。 相似文献
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Satish Chinchanikar S. K. Choudhury 《Journal of Mechanical Science and Technology》2013,27(5):1451-1459
Flank wear progression and wear mechanisms of uncoated, coated with PVD applied single-layer TiAlN, and CVD applied multi-layer MT-TiCN/Al2O3/TiN cemented carbide inserts were analyzed during dry turning of hardened AISI 4340 steel (35 HRC). Experimental observations indicate that by applying a coating to the uncoated insert the limiting cutting speed increase from 62 to 200 m/min, which further extends up-to 300–350 m/min when using multi-layer coating scheme. Relatively lower wear rate seen when using single-layer TiAlN coated inserts. However, after removal of the thin layer of coating the wear rate increase rapidly, subsequently dominates the wear rate of multi-layer coated inserts. Cutting forces; especially axial and radial components have also shown the similar behavior and increase rapidly when the tool failure occurs. Flank wear, crater wear and catastrophic failure are the dominant forms of tool wear. Digital microscope and SEM images coupled with elemental analysis (EDAX) have been taken at various stages of tool life for understanding the wear mechanisms. 相似文献
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The coating material of a tool directly affects the efficiency and cost of machining malleable cast iron.However,the machining adaptability of various coating materials to malleable cast iron has been insufficiently researched.In this paper,turning tests were conducted on cemented carbide tools with different coatings(a thick TiN/TiAlN coating,a thin TiN/TiAlN coating,and a nanocomposite(nc)TiAlSiN coating).All coatings were applied by physical vapor deposi-tion.In a comparative study of chip morphology,cutting force,cutting temperature,specific cutting energy,tool wear,and surface roughness,this study analyzed the cutting characteristics of the tools coated with various materials,and established the relationship between the cutting parameters and machining objectives.The results showed that in malleable cast iron machining,the coating material significantly affects the cutting performance of the tool.Among the three tools,the nc-TiAlSiN-coated carbide tool achieved the minimum cutting force,the lowest cutting tempera-ture,least tool wear,longest tool life,and best surface quality.Moreover,in comparisons between cemented-carbide and compacted-graphite cast iron machined under the same conditions,the wear mechanism of the coated tools was found to depend on the cast iron being machined.Therefore,the performance requirements of a tool depend on multiple factors,and selecting an appropriately coated tool for a particular cast iron material is essential. 相似文献