磨削工具磨粒有序化排布研究现状

磨粒有序化砂轮因可以很好地解决传统磨粒随机排布砂轮容屑空间小、磨削性能差等问题而逐渐被广泛关注。砂轮的有序化包含磨粒有序排布样式的设计和磨粒有序化的实现方法。磨粒有序化的排布样式从简单的单层到复杂的三维以及磨粒群排布,磨粒有序化排布主要通过模板法、掩膜法、点胶法等方法来实现。通过总结对比近几年关于磨粒有序化的排布样式、实现方法以及有序化磨具的磨削性能等,指出磨粒有序化研究方面存在的一些问题,并提出了下一步研究方向。     

超硬材料加工技术发展现状及趋势

介绍了超硬材料常用特种加工方法和机械加工方法，各种方法的发展现状及趋势等。     

磨粒流加工技术简介

介绍了磨粒流加工技术的原理及磨粒流加工系统的组成;列出了其与传统机械加工方法相比具有的优势,并从加工零件的内部处理和外部处理两方面介绍了磨粒流加工技术的应用。     

模具自由磨粒精密光整加工技术

论述了自由磨粒精密光整加工方法的原理、特点、关键技术及具体应用，其目的是在模具制造业中，利用自由磨粒进行光整加工，实现低成本、高表面完整性、高效率精密加工。     

加工钛合金用PcBN刀具材料的性能分析

钛合金以其优良的性能在航空航天、化工能源、医疗、体育、船舶等领域中有广泛的应用,然而它的难加工性限制了它的发展,文章针对铁合金的加工特性,对PcBN刀具材料的性能特点进行了分析总结.     

3D打印超硬磨粒工具研究与展望

随着加工产业向着高精密方向发展,超硬磨粒工具的应用越来越广泛。传统制造业很难实现对于具有内外部复杂结构、高加工精密度、高度个性化加工工具制造。新兴的增材制造技术又称3D打印,与传统的材料成型技术最大的区别在于它的材料利用率较高,可以以一种快速的由原材料层层累加的方式生产出任意形状的产品,有望击破传统超硬磨粒工具生产壁垒。文章主要介绍了主流适用于制造超硬磨粒工具的3D打印技术,如光固化成型技术、激光烧结技术和三维打印成型技术,阐述了每种技术的工艺原理,同时指出了目前存在的问题,对未来3D打印技术成型超硬磨粒工具进行展望。     

高硬度材料加工技术及其发展趋势

文章通过介绍高硬度材料的应用背景,说明高硬度材料加工技术的产生与不断获得发展的必然性。继而介绍了此类难加工材料在加工时常用的两类方法,即机械加工方法及特种加工方法。其中重点介绍了两类方法下各种具体加工方法的材料去除机理、加工特点、发展现状以及趋势。     

超硬材料在硬质合金工具中的应用

文章论述了我国超硬材料的现状及在硬质合金工具中的应用,指出了提高硬质合金质量三个方面的工作,展望了超硬材料在硬度合金应用中的前景。     

高分子材料成型加工技术研究

近些年来。国防尖端工业和航空工业等特殊领域的发展对高分子材料成型的加工技术要求更高,更精细。在此背景下,理清高分子材料加工技术的发展现状与发展趋势,探讨高分子材料的加工成型的方法,对促进我国高新技术及产业的发展具有重要的意义。     

高分子材料成型加工技术研究现状

高分子材料因具有容易加工和容易改性等优点而在航空、国防等领域的应用范围越来越广,同时,各行各业对高分子材料的质量要求也越来越高。在总结大量高分子材料成型加工技术相关文献的基础上,分析了传统成型加工技术和新型加工技术研究现状和应用范围,旨在为高分子成型加工技术的创新提供理论依据。     

Electrochemical machining of refractory materials

The feasibility of the electrochemical machining (ECM) of pure TiC, ZrC, TiB₂ and ZrB₂ has been established. In addition, the ECM behaviour of a cemented TiC/10% Ni composite has been investigated and compared to that of its components, TiC and nickel. ECM was carried out in 2M KNO₃ and in 3 M NaCl at applied voltages of 10–31 V and current densities of 15–115 A cm^–2. Post-ECM surface studies on the TiC/Ni composite showed preferential dissolution of the TiC phase during machining.Nomenclature E ₀ thermodynamic equilibrium potential (V) - F Faraday's constant (96 500 Coul mol^–1) - toolpiece feed rate (cm s^–1 or mm min^–1) - I current (A) - i current density (A cm^–2) - k electrolyte conductivity (^–1 cm^–1) - l interelectrode gap (mm) - mass removal rate (g s^–1 or g min^–1) - M formula weight (g mol^–1) - Q electrolyte flow rate (l min^–1) - t electrolyte temperature (°C) - V applied voltage (V) - V _IR ohmic drop through electrolyte (V) - z apparent valence of dissolution (eq mol^–1) - _i overvoltages (V) - density of refractory materials (g cm^–3)     

有机光电高分子材料研究热点和前沿分析

基于基本科学指标数据库（ESI）的高被引论文,通过热点文献、CiteSpace分析工具得到的热点关键词对应的文献分析,得出有机光电高分子材料主要关注点为有机太阳能电池。有机太阳能电池的研究热点为：高性能活性层材料的设计合成;高性能界面材料的设计合成及其界面调控性能的研究;电池器件中有机半导体活性层表界面的可控掺杂;有机太阳能电池活性层能量损失研究。通过高被引论文的共被引分析,关键词突变探测技术和算法对词频的变动趋势分析,得出有机光电高分子领域最新关注前沿：高效太阳能电池的制备;非富勒稀受体的研究;有机半导体材料的设计合成;结构-性能研究;加工及应用性能。有机光电高分子材料研究活跃的前沿领域：高效全聚合物太阳能电池;三元有机太阳能电池;高效的倒置型太阳能电池;超高迁移率的透明有机薄膜晶体管;高迁移率场效应晶体管;二维共轭聚合物;聚合物半导体等。有机太阳能电池研究前沿主题演化趋势：从聚噻吩给体体系——新型给体-受体体系;单层——双层——本体异质结电池结构;富勒烯受 体——非富勒烯受体;高效及稳定性器件发展。本文创新性地将文献计量分析方法同文献具体内容分析相结合,通过大量的高质量文献内容分析,使得出的研究热点和前沿更具体和接近实际情况,为相关科研人员提供有益参考。     

Micromechanics of machining and wear in hard and brittle materials

Hard and brittle solids with covalent/ionic bonding are used in a wide range of modern-day manufacturing technologies. Optimization of a shaping process can shorten manufacturing time and cost of component production, and at the same time extend component longevity. The same process can contribute to wear and fatigue degradation in service. Educated development of advanced finishing protocols for this class of solids requires a comprehensive understanding of damage mechanisms at small-scale contacts from a materials perspective. The basic science of attendant deformation and removal modes in contact events is here analyzed and discussed in the context of brittle and ductile machining and severe and mild wear. Essentials of brittle–ductile transitions in micro- and nano-indentation fields are outlined, with distinctions between blunt and sharp contacts and axial and sliding loading. The central role of microstructure in material removal modes is highlighted. Pathways to future research—experimental, analytical, and computational—are indicated.     

Abrasive water jet machining and mechanical behavior of banyan tree saw dust powder loaded polypropylene green composites

Banyan tree saw dust powder (BSD) filled Polypropylene (PP) green composites have been fabricated with varying amounts viz., 0%, 20%, and 40% of BSD particulate filler by using a co‐rotating twin screw extruder followed by injection molding. The mechanical properties such as surface hardness, tensile behavior, and impact strength of the fabricated PP/BSD green composites have been studied in order to standardize the composites. Abrasive water jet (AWJ) machining has been reported mainly for ceramics, concrete, and glass but not much literature is available on AWJ machining of polymer composites. This research is aimed at examining the AWJ machining of green polymer composites. The effect of BSD loading on the AWJ machining behavior of the PP/BSD green composites has been investigated. Furthermore, the effect of addition of 4% maleic anhydride grafted PP (coupling agent) and 4% talc (mineral filler) on the machining behavior of PP/BSD composites has also been evaluated. Surface roughness and optical micrographs of the AWJ cut composite specimens were examined to assess the effect of BSD content, AWJ traverse speed and pressure on the machining behavior of the composites. In order to probe the mechanism of AWJ machining behavior of PP/BSD composites, the kerf width and taper have been measured and results are correlated. POLYM. COMPOS., 37:1754–1764, 2016. © 2014 Society of Plastics Engineers     

立方氮化硼在现代加工技术中的地位和作用

文章以PcBN刀具和高速陶瓷cBN砂轮为对象,阐述了其在加工工业中的高速高效、精密、超精密、节能节材、绿色环保、自动化等的技术优势,以及对实现制造业的现代化、绿色化及难加工材料加工等可持续发展中的现实意义、地位和作用。     

模具制造电火花加工电极材料的合理选取

在电火花加工过程中,电极用来传输电脉冲,蚀除工件材料：电极材料必须具有导电性能良好、损耗小、加工成形容易、加工稳定、效率高、材料来源丰富、价格便宜等特点;电极的放电速度、加工精度以及表面粗糙度,取决于电极材料的选取。     

Analysis of CNC machining technology in production of plaster moulds

Abstract

The present paper continues the further application of machining techniques in the ceramics industry with the aim of optimising company resources in new competitive markets. The work is focused on plaster model and mould generation by computer based geometric design, machine tool path creation, and subsequent production through CNC machining using a robotic machining centre. Many constraints were identified related specifically to the machining of plaster used in the manufacture of ceramic ware. Because of the limited information, since most machining investigations have only considered metal machining or fired ceramics, a large number of machining experiments were conducted. It is concluded that substantial advantages are gained through the use of this new approach for ceramic production processes, and the subjects for follow on research are defined.     

加工车用塑料件的创新技术

环保法规日趋严格,汽车燃油价格不断呈上涨势头,控制二氧化碳排放已经处于实际运行阶段.在此背景下,汽车生产厂家积极寻求对策,不断开发新产品,混合动力车(HV)、冲电式混合动力车(PHV)、电动车纷纷投放市场,但目前当务之急应是改善现行内燃发动机的燃费问题及开发环境友好产品.内燃发动机的改良主流是改善发动机变速箱、使用生物燃料及完善社会基本设施来减少二氧化碳排放.从车身出发考虑减少燃费,车辆轻量化最切合实际.汽车轻量化对降低燃费难以进行定量化评估,但预测是每减轻100kg约改善1km/L.     

The role of chemical wear in machining iron based materials by PCD and PCBN super-hard tool materials

The chemical compatibility of PCBN and PCD tool materials with iron has been evaluated by means of the static interaction diffusion-couples technique. Experiments were undertaken at different temperatures (700 °C, 900 °C, 1100 °C and 1300 °C) in order to establish the maximum temperature at which the tool and workpiece materials are chemically compatible. Computational equilibrium thermodynamics was used to calculate the chemical solubility of the different tool materials in iron and to identify the interaction phases formed. The agreement between the experimental results and the thermodynamic calculations was excellent. Machining tests were performed in order to assess the relative importance of the chemical wear on the overall rate of tool wear. The results of these machining tests agreed perfectly with the chemical compatibility study, thereby indicating that under certain machining conditions, chemical wear is the main wear mechanism for these materials in machining iron based materials.