微米／纳米复合Ti（C，N）基金属陶瓷刀具切削铸铁的性能研究

利用热压烧结法制备了微米／纳米复合Ti（C,N）／Al2O3金属陶瓷刀具,对研制的三种金属陶瓷刀具（材料编号JT1-JT3）和YG8硬质合金刀具切削铸铁时的切削性能进行了试验研究。结果表明,研制的金属陶瓷刀具适合切削铸铁,其切削性能优于YG8,尤其是JT2刀具不但磨损较小,且加工表面质量较好。分析了刀具的磨损形貌和磨损机理,得出了Ti（C,N）金属陶瓷刀具的主要磨损机理为后刀面磨粒磨损的结论。     

纳米TiN改性TiC基金属陶瓷刀具切削性能的研究

制备了纳米TiN改性的TiC基金属陶瓷刀片 ,并用该刀片与普通TiC基金属陶瓷刀片进行了对比切削试验。结果表明 ,添加TiN纳米粒子可有效改善TiC基金属陶瓷刀具的机械性能和切削性能 ,改性金属陶瓷刀片可以较高切削速度加工碳钢和合金钢 ,此时其主要失效形式为粘结磨损     

高速干切削时金属陶瓷刀具磨损的试验研究

对金属陶瓷刀具高速干切削45钢时的磨损情况进行了试验和分析。结果表明,进给量对金属陶瓷刀具后刀面磨损的影响与切削速度和刀具磨损形态密切相关,对刀具寿命的影响与低速湿切削时存在较大差异。     

纳米TiN改性的TiC基金属陶瓷刀具切削试验与分析

通过切削试验 ,研究了纳米TiN改性的TiC基金属陶瓷刀具在切削 40Cr和正火态 45钢时的切削性能和失效形式。结果表明 ,该种刀具有良好的切削性能 ,可用于较高速度下钢的切削 ,其主要失效形式为磨损。     

刀具在高速切削时的磨损机理研究

分析了高速切削时刀具的磨损形态,综述了典型高速切削刀具材料在高速切削时的磨损机理,讨论了高速切削铸铁时,陶瓷刀具、金属陶瓷刀具的磨损寿命.     

纳米TiN改性金属陶瓷刀具的磨损性能研究

研究了纳米TiN改性TiC金属陶瓷刀具（纳米改性金属陶瓷刀具，下同）与普通Ti（C，N）基金属陶瓷刀具及硬质合金刀具在切割正火态45钢时的磨损曲线及磨损机理。结果表明：纲米TiN改性TiC基金属陶瓷刀具的效果明显；与硬质合金刀具相比，纳米改性金属陶瓷刀具优良的综合性能使其具有更同的耐磨性。刀具的失效形式主要是磨损及崩刃。     

高速切削刀具磨损寿命的研究

分析了高速切削时刀具的磨损形态 ,综述了各种高速切削刀具材料 (包括陶瓷刀具、立方氮化硼刀具、金刚石刀具、金属陶瓷刀具和涂层刀具 )高速切削时的磨损机理 ,讨论了高速切削铸铁、淬硬钢和镍基合金时刀具的磨损寿命。     

切削铸铁的刀具用新材料

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。     

高速轴向车铣45钢刀具磨损的研究

介绍了轴向车铣加工的特点,通过试验得到了高速轴向车铣加工45钢时刀具的磨损曲线,分析了在水冷和干切削时TiN涂层和金属陶瓷刀具的磨损特点,得出采用干切削更有利于延长刀具使用寿命,且TiN涂层刀具比金属陶瓷刀具更适合高速轴向车铣加工45钢.     

超细晶粒Ti(C,N)基金属陶瓷刀的磨损性能研究

研究了两种超细晶粒纳米改性Ti（C，N）基金属陶瓷刀具——44Ti（C，N）-5TiN（nm）-15WC-16M02C-20Ni（刀具A）和39Ti（C，N）-10TiN（nm）-15WC-16M02C-20Ni（刀具B）在加工正火态中碳钢时的切削性能和磨损机理。研究表明，两种刀具材料的显微组织都由金属相与陶瓷相组成，其中粗大的陶瓷相呈典型的芯／壳结构，陶瓷相晶粒尺寸为400～800nm。切削实验表明，刀具A的切削性能要优于刀具B，刀具A常以后刀面正常磨损的方式失效，刀具B则常以破损崩刃的方式失效。能谱（EDS）分析表明，高速切削时金属陶瓷刀具主要的磨损机制是扩散磨损和氧化磨损。     

Analysis of cutting force coefficients in high-speed ball end milling at varying rotational speeds

In high-speed ball end milling, cutting forces influence machinability, dimensional accuracy, tool failure, tool deflection, machine tool chatter, vibration, etc. Thus, an accurate prediction of cutting forces before actual machining is essential for a good insight into the process to produce good quality machined parts. In this article, an attempt has been made to determine specific cutting force coefficients in ball end milling based on a linear mechanistic model at a higher range of rotational speeds. The force coefficients have been determined based on average cutting force. Cutting force in one revolution of the cutter was recorded to avoid the cutter run-out condition (radial). Milling experiments have been conducted on aluminum alloy of grade Al2014-T6 at different spindle speeds and feeds. Thus, the dependence of specific cutting force coefficients on cutting speeds has been studied and analyzed. It is found that specific cutting force coefficients change with change in rotational speed while keeping other cutting parameters unchanged. Hence, simulated cutting forces at higher range of rotational speed might have considerable errors if specific cutting force coefficients evaluated at lower rotational speed are used. The specific cutting force coefficients obtained analytically have been validated through experiments.     

Experimental investigations of surface roughness in orthogonal turning of unidirectional glass-fiber reinforced plastic composites

Cutting parameters and the resulting cutting forces have a great effect on the machinability of materials during the turning process. The effects of cutting parameters on machinability have been examined by many researchers and studies on determination of suitable cutting conditions for various materials are still under investigation. In this study, surface roughness of unidirectional glass-fiber reinforced plastic composite was examined on the basis of cutting parameters such as depth of cut, feed rate, tool geometry, and cutting speed. The surface quality was found to relate closely to the feed rate, cutting speed, and cutting tool.     

Study of the upper bound of tool edge radius in nanoscale ductile mode cutting of silicon wafer

In cutting of brittle materials, experimentally it was observed that there is an upper bound of tool cutting edge radius, beyond which, although the undeformed chip thickness is smaller than the tool cutting edge radius, the ductile mode cutting cannot be achieved. However, why there is an upper bound of tool cutting edge radius in nanoscale ductile mode cutting of brittle materials has not been fully understood. In this study, based on the tensile stress distribution and the characteristics of the distribution obtained from molecular dynamics simulation of nanoscale ductile cutting of silicon, an approximation for the tensile stress distribution was obtained. Using this tensile stress distribution with the principles of geometrical similarity and fracture mechanics, the critical conditions for the crack initiation have been determined. The result showed that there is a critical tool cutting edge radius, beyond which crack initiation can occur in the nanoscale cutting of silicon, and the chip formation mode is transferred from ductile to brittle. That is, this critical tool cutting edge radius is the upper bound of the tool cutting edge radius for ductile mode cutting of silicon.     

SiC颗粒增强铝基复合材料高速铣削实验研究

对SiC颗粒增强铝基复合材料的高速切削加工性能进行了试验分析，研究了铣削速度对铣削力、切削温度、加工表面粗糙度、表面形貌和刀具磨损的影响，从而获得了能够保证对其进行高效率、高精度加工的合理工艺参数。     

TiAIN涂层铣刀铣削CoCrMo合金切削性能的试验研究

针对医用人工假体材料钴铬钼(CoCrMo)合金的高速铣削加工性能进行了试验研究。深入分析了铣削速度对铣削力、表面粗糙度、表面形貌和刀具的磨损的影响。并获得能够保证对其进行高效高精度加工的合理工艺参数。     

THE EFFECT OF THE CUTTING FLUID ON SURFACE ROUGHNESS IN BORING OF LOW CARBON STEEL-TECHNICAL COMMUNICATION

In spite of their environmental and human health problems, the cutting fluids still have been used widely in industry due to cutting fluid application can increase cutting performance in metal cutting. In this article, the effect of the cutting fluid on surface roughness in boring of AISI 1030 low carbon steel was investigated depending on BUE and chip formations and other cutting parameters, such as cutting speed, feed rate and tool nose radius. In most of boring experiments, the wet cutting did not show more preferable results than dry cutting. However, cutting fluid application with big nose radius and small feed rate improved the surface roughness up to 80%. This progress was attributed to a favorable chip formation as much as effective cooling.     

THE EFFECT OF THE CUTTING FLUID ON SURFACE ROUGHNESS IN BORING OF LOW CARBON STEEL–TECHNICAL COMMUNICATION

In spite of their environmental and human health problems, the cutting fluids still have been used widely in industry due to cutting fluid application can increase cutting performance in metal cutting. In this article, the effect of the cutting fluid on surface roughness in boring of AISI 1030 low carbon steel was investigated depending on BUE and chip formations and other cutting parameters, such as cutting speed, feed rate and tool nose radius. In most of boring experiments, the wet cutting did not show more preferable results than dry cutting. However, cutting fluid application with big nose radius and small feed rate improved the surface roughness up to 80%. This progress was attributed to a favorable chip formation as much as effective cooling.     

TiAlN涂层铣刀铣削9SiCr钢切削性能试验研究

采用TiAlN涂层刀具,对合金工具钢9SiCr的高速铣削加工性能进行试验研究,分析铣削速度对铣削力、表面粗糙 度、表面形貌、切屑变形和刀具的磨损的影响。并获得能够保证对其进行高效高精度加工的合理工艺参数。     

实用化振动切削技术——总论

振动切削技术历经半个世纪的发展，逐步揭示了振动切削的机理，形成了振动切削理论体系。同时，在大量工艺试验研究的基础上，得到了大量的工艺效果并研制出了各种振动切削装备，逐步使振动切削技术走向实用化。     

Thin layer activation for testing cutting fluids

Experiments have been carried out to test cutting fluid performance using a newly developed radioactive technique. A small volume of the cutting edge of turning inserts was irradiated by charged particles from a cyclotron which gives a very low overall radioactivity in the tool. The radioactive edge was then used in machining steel bars, and the activity was monitored periodically. The decrease in the radioactivity indicates tool wear. The tool wear rate with various cutting fluids has been used to assess their performance. It has been shown that this technique can be used in short term machinability tests