亚干式深孔加工刀具技术

结合干式切削和深孔加工的特点,提出一种亚干式深孔加工解决方案,介绍了亚干式深孔加工系统以及深孔刀具的结构设计。通过切削试验,确定了适用的刀片材料,并对干、湿两种加工方式下刀具的切削性能进行了对比分析,设计了适用于亚干式深孔加工的切削刀具。     

干式和准干式切削技术及其刀具材料

综述了干式和准干式切削技术及其发展现状,指出干式和准干式切削刀具的设计原则,对目前在产品加工中应用的干式和准干式切削刀具材料作了介绍。     

干式加工技术切削刀具的研究

干式加工技术的发展在很大程度上要依赖于切削刀具的开发与应用。本文正是在干式加工的基础上,主要从刀具材料、涂层及几何形状等方面分析影响切削刀具性能的因素,总结了不同加工条件下切削刀具的应用。     

干式切削及刀具的选用

干切削技术起源于欧洲,目前在西欧各国也最为盛行。据统计现在已有8％左右的德国企业采用了干切削技术。干切削技术从出现到现在只有短短10年的历史,它是一种新兴的绿色制造技术．对实施人类可持续发展战略有重要的意义,是新世纪的前沿制造技术。本文从切削液加工的不利因素、干式切削是切削加工的发展方向、干式切削刀具材料的选用、干式切削需要考虑的事项四个方面对比阐述了干式切削与传统切削方式的不同之处及如何选用干式切削刀具。     

PCBN刀具的切削性能

综合实际数据、曲线介绍了ＰＣＢＮ刀具在淬硬钢、铸铁及有色金属等材料切削加工中的切削特性及其在硬态切削、干式切削、高速切削等加工技术中的应用。同时也介绍了ＰＣＢＮ刀具的加工表面质量。     

PCBN刀具的切削性能

综合实际数据、曲线介绍了ＰＣＢＮ刀具在淬硬钢、铸铁及有色金属等材料切削加工中的切削特性及其在硬态切削、干式切削、高速切削等加工技术中的应用。同时也介绍了ＰＣＢＮ刀具的加工表面质量。     

氮化碳涂层刀具干式切削研究

通过与传统湿式切削加工的对比,介绍了金属干式切削加工的技术优点和发展趋势,分析了氮化碳涂层刀具的特点。通过干式切削淬火钢的试验,分析了涂层刀具干式切削加工的技术特点及刀具的磨损机理。试验表明,氮化碳涂层能够很好地保证干式切削的进行,涂层一旦磨损,刀具很快磨损;切削参数中切削速度对刀具寿命影响最大。     

干式切削加工技术及其应用

干式切削加工有利于保护环境和降低生产成本 ,符合“绿色制造”概念 ,是金属切削加工的发展方向之一。本文讨论了干式切削刀具 (包括刀具形状、刀具材料和涂层 )的设计原则 ,介绍了干式切削在钻削、铣削和镗削加工中的应用实例     

干式切削刀具及其应用

从干式切削技术的绿色特性出发,介绍了干式切削刀具的新材料、涂层技术和刀具设计技术,详细地讨论了采用新材料的干式切削刀具、涂层刀具和新型结构刀具等三方面的应用情况,对干式切削刀具技术的发展和应用情况进行了展望。     

干式切削在铣削加工中的应用

干式切削是绿色制造工艺技术，已成为金属切削加工发展的趋势之一，分析了干式切削加工对刀具的要求，讨论了刀具材料的选择，分析了干式切削在铣削中的应用实例。     

高速加工中干切削、硬切削刀具的应用技术分析

系统分析了高速切削加工中使用的干切削、硬切削刀具材料及其技术性能以及应用技术.     

42CrMo合金结构钢的干切削和近干切削研究

合金结构钢以其生产规模大、易于加工、性能多样、价格低廉、使用方便和便于回收等特征成为重要的钢铁材料。干切削和微量润滑加工技术是目前金属加工技术的主要发展方向之一,也是实现绿色制造的关键技术。文中对合金结构钢42CrMo在干切削和近干切削加工条件下,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比较深入的研究。结果表明,通过选择适当的切削参数,刀具材料和刀具涂层,可以很好地实现这种材料的干切削加工,甚至可以获得比传统乳化剂加工更低的刀具磨损和更好的表面质量。     

Effect of Chilled Air on Machining Performance in End Milling

Flood coolant is customarily used to increase tool life and to improve workpiece surface finish in machining. It is also responsible for some adverse effects on the environment and users’ health, and hence the interest in chilled air assisted machining as an alternative to flood coolant. The effect of chilled air on machining performance was carried out using an end-milling operation on ASSAB 718HH mould steel using uncoated tungsten carbide inserts at different depths of cut, feedrates and cutting speeds under three different lubrication modes, i.e. chilled air, conventional coolant, and dry cutting. The relative performance of these modes is evaluated in terms of tool wear, surface finish, cutting force, and quality of the chips. Lower tool wear was observed using chilled air compared to that for the conventional flood coolant at a lower depth of cut, lower feedrate and lower cutting speed. The surface roughness was found to reduce at higher depths of cut, higher feedrates and higher cutting speeds for chilled air as compared to dry cutting and flood coolant. It is also observed that the cutting force experienced with chilled air is comparable and, in many cases, lower than that when using flood coolant. Stress lines on the chip surfaces show that the chips experienced the highest shear stress in dry cutting, followed by cutting with chilled air and lastly, with flood coolant.     

PCBN刀具及其在切削加工中的应用

阐述了PCBN刀具材料的物理性能和切削性能,及其在不同切削领域应用的特点,并对关键技术进行了探讨。     

Selection of an optimal parametric combination for achieving a better surface finish in dry milling using genetic algorithms

In machining, coolants improve machinability, increase productivity by reducing tool wear and extend tool life. However, due to ecological and human health problems, manufacturing industries are now being forced to implement strategies to reduce the amount of cutting fluids used in their production lines. A trend that has emerged to solve these problems is machining without fluid – a method called dry machining – which has been made possible due to technological innovations. This paper presents an experimental investigation of the influence of tool geometry (radial rake angle and nose radius) and cutting conditions (cutting speed and feed rate) on machining performance in dry milling with four fluted solid TiAlN-coated carbide end mill cutters based on Taguchi’s experimental design method. The mathematical model, in terms of machining parameters, was developed for surface roughness prediction using response surface methodology. The optimization is then carried out with genetic algorithms using the surface roughness model developed and validated in this work. This methodology helps to determine the best possible tool geometry and cutting conditions for dry milling.     

高速干切削技术研究

高速干切削技术作为一种新型的绿色制造技术,不仅能避免切削液对环境的污染,而且能大幅度降低产品的生产成本.文中介绍了高速干切削技术研究现状,对实现高速干切削的机床技术和刀具技术进行了系统的阐述.     

WEAR STUDIES AND CUTTING TESTS OF Ti–Al–N–C NANOCOMPOSITE COATINGS IN MILLING OPERATIONS – TECHNICAL COMMUNICATION

New carbon-based nanostructured composite coatings of the material system Ti–Al–N–C were deposited on cemented carbide milling tools, and their feasibility for selected dry high-speed machining operations was assessed. For this purpose, wear studies with instrumented cutting machines in dry cutting tests were carried out in milling operations on Uddeholm hardened steels (AISI H13, and, AISI A2, respectively). The tools were coated in an industrial sputtering machine of the Hauzer HTC 625 type. The new nanocomposite coatings showed a good performance in the dry cutting operations and were benchmarked versus industrial state-of-the-art coatings.     

超硬刀具材料的发展与应用

现代集成制造系统的发展和切削速度的不断提高对刀具性能提出更高的要求。开发各种具有优良耐磨性和高稳定性的超硬切削刀具是发展趋势。PCD(Poly Crystalline Diamond)和PCBN(Poly Cubic Boron Nitride)在生产中可获得常规切削加工达不到的尺寸和表面粗糙度,研究PCD和PCBN的发展和应用非常必要。本文全面介绍了超硬刀具材料(PCD和PCBN方面)的发展,阐述了2种材料的性能特点以及它们在不同领域及加工材料方面的切削应用。     

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.