金刚石涂层刀具在干式切削中的性能分析

介绍了干式切削加工技术的优点及发展趋势,分析了干式切削刀具技术及金刚石涂层刀具的性能特点.通过铝硅合金的干式切削试验,研究了金刚石涂层刀具的干式切削加工特性.经试验表明,金刚石涂层刀具正常磨损阶段,工件表面粗糙度非常稳定;刀具损坏以涂层脱落为主,刀具寿命取决于涂层与机体的结合强度;进给量对工件表面粗糙度影响最大,如果进给量合适,可以保证金刚石涂层刀具在高速下具有良好的干式切削性能.     

金刚石薄膜涂层刀具切削性能与磨损过程的研究

金刚石薄膜具有高硬度、低摩擦系数、高耐磨性和高导热性能。金刚石薄膜涂层刀具高速干切削硅铝合金可提高生产率。通过金刚石薄膜涂层刀具的切削试验和考察其磨损过程，表明了金刚石薄膜涂层刀具的使用寿命明显高于未涂层的硬质合金刀具，金刚石薄膜涂层刀具的磨损是由薄膜的显微断裂而逐渐脱落的过程。     

超细晶粒金刚石涂层刀具高速铣削石墨的切削性能研究

选用超细晶粒和粗晶粒金刚石涂层的双刃整体硬质合金平头立铣刀,在相同切削参数下进行石墨的高速铣削加工试验.试验结果表明:超细晶粒金刚石涂层刀具具有良好的表面涂层性能,在切削过程中刀刃磨损均匀缓慢,刀具的使用寿命和工件的加工表面质量都优于粗晶粒金刚石涂层刀具,适合石墨等硬脆材料的高速切削加工.     

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。     

高速切削加工刀具材料

论述了高速切削的概念和优越性,介绍了高速切削加工所使用的先进刀具材料和刀具如：陶瓷刀具、金刚石刀具、立方氮化硼刀具、涂层刀具的性能特点及其应用,探讨了高速切削刀具材料的发展前景和研究方向。     

高速切削刀具材料及其与工件匹配研究

实现高速切削加工,刀具材料是关键。目前国内外用于高速切削加工的刀具材料主要有聚晶金刚石(PCD)、立方氮化硼(CBN)、陶瓷、TiCN基金属陶瓷和涂层刀具等。本文介绍了这些高速切削刀具材料各自的特点和应用范围,分析了高速切削刀具材料与工件材料的匹配,并阐述了针对常用工程材料的高速切削加工和刀具材料的合理选择。     

高速切削刀具材料的发展应用研究

发展高速切削是现代切削加工技术的重要趋势,高速切削刀具材料也是影响制造业发展的重要因素.介绍了高速切削刀具材料的特点,具体分析了高速切削加工常见刀具材料硬质合金、陶瓷、金刚石类材料的特性、发展及其应用,并对未来高速切削刀具材料的发展趋势进行了展望.细晶和表面涂层硬质合金材料、氧化铝各系列陶瓷材料以及立方氮化硼(CBN)金刚石类材料是未来高速切削刀具材料发展的方向.根据高速切削刀具材料的特点,应用场合及其发展状态,对其未来的发展提出一些建议.     

晶粒细化对金刚石涂层刀具切削性能的影响

金刚石涂层具有高硬度、低摩擦系数、高耐磨性和高导热性能。本文着重介绍了金刚石涂层刀具的发展动向及现状,并通过金刚石涂层刀具的切削试验表明了金刚石涂层刀具的使用寿命明显高于未涂层的硬质合金刀具,采用金刚石涂层刀具进行切削可以获得更高的表面加工质量和生产率。     

超硬涂层刀具

涂层刀具的出现是刀具发展史上的一个重要里程碑,解决了刀具材料硬度和耐磨性愈高强度和韧性愈低的矛盾.金刚石等超硬涂层刀具的问世,是近几年来涂层技术发展的一个重大成就.它与新一代高速机床及工具系统相结合,使高速切削、干切削和硬加工技术得到迅速发展,并使切削效率和零件的加工质量的提高达到一个新的水平     

高速切削刀具材料及其应用

高速切削能加工出精度较高的零件，还能降低加工成本。高速切削技术已经成为最有前途的先进制造技术之一，其应用领域正在持续扩展。高速切削技术是随着刀具技术如刀具材料等的发展而发展起来的。介绍了高速切削中所使用的金刚石、立方氮化硼、陶瓷、金属陶瓷和涂层刀具等的性能、适用范围和发展方向，并介绍涂层刀具、超细晶粒硬质合金和高速钢刀具的制备技术，以促进高速切削技术的推广应用。     

高速铣削用机械阻尼器铣刀模型的建立及其减振规律的分析

高速铣削加工过程中,刀具颤振会对机床、刀具和工件表面产生不良影响。提出增加机械阻尼器来抑制铣刀颤振的方法;通过对建立的铣刀模型进行理论分析,讨论了阻尼耗散功率随着刀指内径、刀指数目、刀指初始安装角变化而变化的规律。     

基于知识的高速面铣刀设计系统研究

高速面铣刀是知识密集型产品,传统设计方法存在设计周期长且不能很好地利用已有知识和经验的问题。本文采用基于知识的高速面铣刀设计方法,提出了基于知识的高速面铣刀设计框架模型,创建了基于规则的高速面铣刀设计知识库和基于特征相似度的高速面铣刀实例库,并在UG／NX平台上开发了基于知识的高速面铣刀设计系统,实现了知识驱动的切削铝合金高速面铣刀模型的快速设计。最后,通过对铣刀模型的应力场分析和实际切削试验验证了该方法的可行性和推理的正确性。     

Method for recognizing wave dynamics damage in high-speed milling cutter

Under the influence of a high-speed, interrupted-cutting impact load, a great difference is existed among the internal load propagation of a milling cutter. Furthermore, the cutter damage caused by partial particle severe vibration has restricted the improvement of a high-speed milling energy efficiency; thus, the essence of wave dynamics damage in milling cutter remains has yet to be revealed. In this paper, through the relation between the systematic whole vibration and the particle motion, the dynamic response of milling cutter’s particle to cutting force load can be solved by the particle motion differential equation which is constructed with a one-dimensional string dynamic system. A combination of Newton’s second law and the constitutive equation of milling cutter material establishes the wave dynamics equation of milling cutter components. An approach for solving the wave front position and wave velocity of milling cutter’s stress wave is proposed, and the propagation path of transient cutting force to the milling cutter is communicated. The attenuation model of stress wave reflection is established to provide a method for revealing the stress wave transmission and distribution in milling cutter. The constitutive relation of milling cutter components under the impact load is obtained by split Hopkinson pressure bar experiment. A force connection method is adopted to make the trans-scale correlation analysis between continuum medium mechanics and molecular dynamics, thereby revealing the wave dynamics damage characteristics of a high-speed milling cutter. The results show that the potential damage position and types of milling cutter can be distinguished by the above method.     

A game theoretical study of cooperative advertising in a single-manufacturer-two-retailers supply chain

In the high-speed milling process of large end milling cutter, the stress of cutter caused by centrifugal force accounts for a large proportion of the total stress of the cutter and has a great influence on the milling process. In this paper, an end milling cutter with a diameter of 2,800 mm used on large and high-speed aluminum blank milling machine tools is taken as a research object, and the equations of internal stress caused by centrifugal force have been derived by using analytic method. On this basis, the factors affecting the internal stress were analyzed. Furthermore, the analytic results and the finite element analysis results were compared in order to confirm their correctness. Finally, according to the results of stress analysis, structure topology optimization design for large end milling cutter was carried out in order to reduce the weight and centrifugal force of the cutter.     

基于失效分析的铝合金高速铣刀设计方法研究

通过对试制样品在切削试验和实际使用中失效形式的实证考察,结合在高速切削状态下高强度铝合金的切削性能和铣刀的应力应变特征,分析了铝合金高速铣刀的失效机理,确定了铝合金高速铣刀的具体设计方法,并简要介绍了其制造、使用要求.     

基于彭恒武判别法的高速面铣刀综合性能评价

在分析高速面铣刀变形和振动对其综合切削性能影响的基础上,采用均匀试验设计方法,通过高转速条件下铣刀变形和固有特性数值分析,获得高速面铣刀最大变形与共振频率回归模型;采用彭恒武判别法建立高速面铣刀综合性能判据,并对典型结构高速面铣刀性能进行了综合评判。结果表明,弹性模量、密度等铣刀材料属性对其安全性和高效切削性能具有重要影响;采用铣刀综合性能判据,可有效地控制其变形和共振范围,获得良好的综合切削性能;采用上述评价方法设计的高速面铣刀切削高强度铝合金时,金属切除率达到129600mm3／min,表面粗糙度小于0．8μm,其综合性能满足高速切削要求。     

高速干式飞刀铣齿切削温度仿真分析及实验研究

根据金属切削和传热学理论，采用高速干式飞刀铣齿模拟滚齿加工过程，建立了飞刀铣齿切削温度的数学模型，推导出飞刀多因素切削温度场计算公式，对高速干式飞刀铣齿的切削温度进行了仿真分析，并结合高速干式飞刀铣齿实验，采集实验数据与理论数据进行了对比分析，考察了切削温度与各主要切削参数之间的关系及变化规律，从而验证理论仿真模型的正确性，为进一步研究高速干式滚齿的切削温度和高速干式滚齿的切削机理等问题，奠定了基础。     

Noise reduction of a high-speed printing system using optimized gears based on Taguchi’s method

To meet the increasing demand for more quiet printers, a noise reduction method is required for high-speed laser beam printing. The driving-gear noise is one of the most important components influencing the noise level in laser beam printers. In this paper, optimized gear designs based on Taguchi’s method are presented. The proposed optimized gears are applied to a high-speed laser beam printer. The design parameters for the plastic gear are selected during optimization as follows: a pressure angle of 20°, a helix angle of 20°, a module of 0.5, and a profile coefficient of 1.4/0.2/1.2 (cutter addendum × module / cutter tip radius × module / cutter dedendum × module). Through the Taguchi method, the prominence ratio and loudness in the sense of human hearing range, as well as the sound pressure level (SPL) are also reduced in the present printing system.     

Cutter path orientations when high-speed finish milling inclined hardened steel

The use of high-speed milling (HSM) for the production of moulds and dies is becoming more widespread. Critical aspects of the technology include cutting tools, machinability data, cutter path generation and technology. Much published information exists on cutting tools and related data (cutting speeds, feed rates, depths of cut, etc.). However, relatively little information has been published on the evaluation of cutter paths for this application. Most of the research focuses on cutter path generation with the main aim on reducing production time. Work concerning cutter path evaluation and optimisation on tool wear, tool life and relevant workpiece machinability characteristics are scant. This paper investigates and evaluates the different cutter path orientations when high-speed finish milling inclined hardened steel, at a workpiece inclination angle of 75°. The results demonstrate that employing a vertical downward orientation achieved the longest life. However, in terms of workpiece surface roughness, vertical upward orientation is generally preferred.     

整体硬质合金球头立铣刀的重磨试验研究

以高速加工的整体硬质合金球头立铣刀的重磨试验为例,介绍了为适应不锈钢的高速加工,铣刀结构参数、涂层而进行的调整,并介绍了铣刀的重磨流程。试切表明:重磨刀具的平均寿命接近新刀。