共查询到19条相似文献,搜索用时 125 毫秒
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使用TiSiN和TiAlN涂层刀具在3种不同冷却润滑方式下,在高速加工中心上采用固定的切削工艺参数,对淬硬钢SKD11(HRC 62)进行切削试验,研究加工工件的表面粗糙度、切削力、刀具磨损及切屑形态的不同.结果 表明:TiSiN涂层铣刀相对于TiAlN涂层能更好地降低已加工面的表面粗糙度,减小切削力,降低刀具的磨损;... 相似文献
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采用四种不同涂层硬质合金铣刀高速铣削四种不同硬度的淬硬钢材料,研究了刀具涂层成分、工件材料硬度以及切削工艺参数(切削速度、每齿进给量、轴向铣削深度和径向铣削深度)对切削力的影响。研究表明:随着切削速度的增大,淬硬钢P20和S136的切削合力影响较小,而对于淬硬钢SKD11和PM60,改变切削速度对切削合力影响显著。随着切削速度的增大,四种不同涂层刀具切削淬硬钢S136产生的切削合力先快速增大后缓慢减小,刀具切削力大小顺序一直保持为TiSiN>CrSiN>AlCrN>TiAlN,其中TiAlN涂层相对于其余三种刀具涂层在降低切削力、减少工件与刀具之间的相互摩擦具有优势。切削参数的变化对切削力的影响与淬硬钢工件硬度的变化存在相互影响,淬硬钢硬度低于HRC55时,切削工艺参数的变化对于切削力的变化影响不明显;而当淬硬钢硬度高于HRC60时,随着切削工艺参数的增大,切削力发生显著变化。 相似文献
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高硬度模具钢(硬度HRC60~65),性能优良、延伸率小、塑性低,易于形成高光洁加工表面.但是对其进行铣削加工时存在着由于切削温度和切削力过高引起的诸多问题,如较差的表面质量以及较低的刀具寿命等.上海工具厂有限公司开发了高效涂层系列-火凤凰涂层.相对于无涂层刀具以及常规TiAlN涂层刀具,火凤凰涂层铣刀在加工质量和刀具耐用度方面有着突出的表现.本文通过对火凤凰涂层铣刀切削加工性能进行评价,从刀具失效机理、磨损过程、切削力、切屑变形系数以及已加工表面质量等全方位进行研究,对实现高硬度模具钢的高效率.高精度刀具应用和推广提供了重要的应用理论依据. 相似文献
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对α+β钛合金TC11进行车削工艺研究,采用无涂层、PVD Ti Al N涂层、金刚石涂层三种刀片在干式加工和MQL冷却状态下进行车削试验。研究不同刀具、冷却方式和加工参数对车削TC11钛合金切削力、切削温度、加工表面质量、刀具寿命和刀具磨损方式等影响规律。通过相关试验数据得出相关切削参数,为优选加工刀具提供参考。 相似文献
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TiAlN涂层硬质合金刀具铣削35CrMoSiV钢的切削性能研究 总被引:1,自引:0,他引:1
采用有和无PVD TiAlN涂层的细晶硬质合金铣刀对35CrMoSiV合金钢进行了干式端面铣削试验。分别测量了有、无涂层情况下铣刀后刀面径向磨损量和加工槽的表面粗糙度,通过光学显微镜观察了切屑,利用扫描电子显微镜(SEM)和电子能谱(EDX)分析了后刀面的磨损形态。研究结果表明:TiAlN涂层明显提高了硬质合金刀具的切削性能;硬质合金刀具后刀面磨损机制主要为粘着磨损和磨粒磨损,而涂层损伤是粘着磨损、剥层和氧化磨损共同作用的结果;在正常工作区内,提高铣削的转速和进给量,有利于减轻刀具的粘着,提高切削效率和质量。 相似文献
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基于涂层刀具的摩擦学机理,通过干铣削、水溶性切削液、空气油雾、氮气油雾介质下淬硬模具钢高速铣削磨损试验的研究,得出氮铝钛(TiAlN)涂层刀具高速铣削淬硬模具钢时的磨损规律与寿命。 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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Wear mechanisms and tool performance of TiAlN PVD coated inserts during machining of AISI 4140 steel
《Wear》2007,262(1-2):64-69
The tribological influences of PVD-applied TiAlN coatings on the wear of cemented carbide inserts and the microstructure wear behaviors of the coated tools under dry and wet machining are investigated. The turning test was conducted with variable high cutting speeds ranging from 210 to 410 m/min. The analyses based on the experimental results lead to strong evidences that conventional coolant has a retarded effect on TiAlN coatings under high-speed machining. Micro-wear mechanisms identified in the tests through SEM micrographs include edge chipping, micro-abrasion, micro-fatigue, micro-thermal, and micro-attrition. These micro-structural variations of coatings provide structure-physical alterations as the measures for wear alert of TiAlN coated tool inserts under high speed machining of steels. 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
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通过对TiAlN涂层硬质合金刀具在淬硬模具钢高速数控切削中的切削力、刀具磨损及加工策略的分析,为模具材料的高速数控加工提供了实用依据。 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