学术活动报道

硬质合金制造、使用经验交流会在天津召开今年九月二日到八日,一机部情报所和天津市科协、天津市机械局等几单位联合举办了硬质合金制造、使用经验交流会。参加这次会议的有有失工业部门的工厂、企业、科研单位以及高等学校一百三十个单位的代表一百八十多人。 会议着重讨论了失于硬质合金制造、使用范围及其技术经济效果;关于硬质合金在我国推广使用的技术问题,失于硬质合金质量的改进及建立我国的一整套硬质合金系统等问题。 会议认为,近年来,我国硬质合金的制造、使用已经有了较快的发展,并取得了显著的效果,在我国的工业生产中已经扎了…     

用于高速切削的涂层硬质合金立铣刀

硬质合金刀具的使用开始于20世纪40年代,而在70年代以前都是使用无涂层的硬质合金刀具,而现在使用的硬质合金刀具2/3以上是经过涂层处理的。     

几种刀具在加工时产生的故障及应采取的措施

<正> 硬质合金钻头、铰刀、车刀在使用过程中,经常产生故障,必须及时采取相应的对策。一、硬质合金钻头:影响硬质合金钻头切     

硬质合金刀具的合理使用(上)

硬质合金是高速切削的主要刀具材料,特别是在高速车削中用得最普遍。正确合理地使用硬质合金刀具,是保证高度劳动生产率和得到良好的加工质量的重要关键。由於硬质合金的硬度高、脆性大,很容易崩裂,所以在使用中要特别注意:要按硬质合金的性质和工作条件来选择刀片;要正确的     

硬质合金的电火花加工

众所周知,硬质合金作为高性能的模具材料,拥有优异的耐磨性（高寿命）、高温强度与热位移小等诸多优点,因此,许多模具由使用钢趋向于使用硬质合金。     

硬质合金刀具裂纹的产生及其防止

近年来各厂使用硬质合金刀具时,普遍存在硬质合金裂纹问题,严重地影响到生产率的继续提高,也影响到硬质合金的推广。     

硬质合金钢球冲模的设计、制造和使用

去年七月中旬,在洛阳召开了“轴承行业硬质合金钢球冲模使用经验交流会”.参加会议的有30多个轴承厂(所),还特邀了株州硬质合金厂、硬质合金研究所以及洛阳粉末冶金厂参加.会议以批林整风为纲,认真总结了坚持政治挂帅,大搞群众运动,实行两参一改三结合的经验,交流了硬质合金钢球冲模设计、制造和使用方面的经验,讨论和提出了修订《1967年轴承工业硬质合金工、夹、量、模具毛坯标准草案》的初步意见,介绍了国外应用硬质合金的情况以及今后在轴承行业工具制造方面扩大使用硬质合金的问题.由于篇幅所限,现仅将哈、瓦、洛轴和上海钢球厂的经验加以整理报导.     

硬质合金刀具的合理使用(下)

(四)硬质合金刀具的磨砺关于硬质合金的选择方法和正确使用的方法,以及硬质合金的焊接等,在前两期中都已经谈过了,现在就来谈一谈怎样正确的磨砺硬质合金刀具。     

使用硬质合金刀具的要求

硬质合金切削刀具是目前切削加工中使用最多最广的一种刀具。它的完善程度对切削加工的现状和发展起着决定性的作用,硬质合金刀具和其他刀具比较,具有较高的切削性能,但使用强度较低,因此在采用硬质合金刀具加工时,要遵守许多条件。我从多年实践中总结了几点硬质合金刀具使用的基本要求,供同行们参考。     

合理选取硬质合金枪钻的设计参数

硬质合金枪钻作为一种深孔加工用钻头,因最初多用于军工制造业枪管孔的加工而得名.随着硬质合金枪钻的开发技术日趋完善,硬质合金枪钻的品种规格已逐步形成系列,使用硬质合金枪钻进行钻削加工已经成为一种方便高效的加工方式,被许多领域如汽车、航天、结构建筑、医疗器材、冶金、模具、刀具及油压、空压工业广泛接受,目前在汽车发动机气门导管的加工、油泵喷油嘴偶件、液压阀体、锅炉蒸发管壁的深孔加工、印刷线路板重叠孔的加工中都大量使用了硬质合金枪钻.     

Measurement of in-plane deformation by surface inclusion (proposed measuring method and some experimental results)

A new measuring technique is proposed for measuring the in-plane deformation of soft metal surfaces when indented by a hard indenter, using the displacement of inclusions on the soft metal surface as sensors. In in-plane deformation, the soft metal surface flows along the hard indenter surface. In this paper, the principle of this new measuring technique is explained and some example measurements obtained from the experiments with aluminum and copper beryllium alloy plates, are presented.     

基于SolidWorks配置技术在整体硬质合金刀具中的应用

针对SolidWorks软件中的配置技术及其应用,以整体硬质合金刀具——直槽铰刀为例,运用配置技术中的手动设置的方法,并与常规方法对比,来说明SolidWorks的配置技术这一功能在CAD中、模型由三维图生成工程图的应用。     

Nanoparticle scanning and detection on flat and structured surfaces using fluorescence microscopy

A new technique is proposed for the scanning and detection of nanoparticles on flat substrates and three-dimensional structures using fluorescence microscopy. This technique is utilized for particle removal measurements especially in semiconductor and hard disk manufacturing. This fluorescent particle scanning technique enables nanoscale particle detection. The technique shows that single particles down to 63 nm could be detected and counted. The technique is also capable of detecting particles in trenches that are as deep as 500 microm.     

短电弧加工技术及其应用

简述短电弧加工技术的基本工作原理,介绍该技术目前的发展状况及技术应用领域,有待于解决的关键技术问题,指出该技术的实际应用价值及发展前景,对于指导短电弧加工技术的深入研究具有一定意义.     

深圆锥形管件冷挤压成形工艺

在实际生产中，相对高度为5～12的深圆锥形厚壁管件的成形工艺难度较大。采用冷挤压成形工艺方法。能生产出各种尺寸、规格的深圆锥形管件。论述了冷挤压成形工艺原理及工艺条件、坯料的选择、冷挤压模具结构设计的特点及参数，该工艺方法简单。材料利用率高。     

冷轧带钢无酸除鳞技术

介绍一种不用酸液、环保经济的新型除鳞方法,该方法将硬质钢砂与水相混合后喷射到带钢表面,能有效去除热轧板卷表面的氧化层,并且形成一层高效保护膜,防止带钢表面被再次腐蚀,该方法所用设备简单易行,投资少,运行成本低,除鳞效果好,代表冷轧带钢无酸除鳞技术的发展方向。     

Preparation of hard particle powders for examination in the transmission electron microscope

A new technique for preparing electron-transparent specimens of hard particle powders is described. It consists of mechanically embedding the powder into a thin foil of soft metal followed by ion-beam etching. This has numerous advantages over other methods of examining powders, such as their direct examination when supported by a carbon film, or by using epoxy resin as an embedding medium. The metal foil can be chosen to minimize overlap of the spectrographic peaks of the metal and the hard particles.     

Enhanced Sliding Wear Resistance of Technical Alloys by Hard Particle Reinforcement Using Machine Hammer Peening

Machine hammer peening is a surface treatment technique originally developed for smoothening tools and mold surfaces. Treated surfaces are locally cold-worked, which results in a hardness increase and the induction of compressive residual stresses. In the present work, the feasibility of using this technique as a tool for embedding tungsten carbide hard particles on engineering-relevant substrate materials is systematically investigated. Tungsten carbide particles of three different sizes were embedded onto selected substrates using machine hammer peening. The particle embedment quality of the engineered surfaces was evaluated and correlated to the substrates' mechanical properties. The resulting tribological performance was investigated under reciprocating sliding conditions and the dominant wear mechanisms were correlated with the diameter of the embedded particles. The results show that machine hammer peening is a suitable technique for embedding hard particles in substrates of various materials, which additionally results in an enhancement in wear resistance, thus opening up a wide range of potential applications in tribologically loaded surfaces.     

硬质合金外螺纹的电火花成型机加工工艺探讨

结合硬质合金的材料特性,将电火花成型电极加工内外螺纹的工艺差异进行对比,分析硬质合金外螺纹电火花加工工艺难点,并提出合理的改进措施。再以电火花成型电极加工YG6硬质合金外螺纹为实例,运用改进方法成功加工出较高质量的外螺纹。结果表明:选取合适的峰值电流,改进加工电极结构是保证外螺纹加工质量的关键技术。最后对单电极电火花加工外螺纹的可行性工艺方案进行详细说明。     

A method for the study of internal spaces in hard tissue matrices by SEM, with special reference to dentine.

Infiltration of a porous hard tissue with methyl methacrylate, followed by dissolution of the tissue provides a three-dimensional methacrylate cast of spaces within the tissue. Examination of such a cast by scanning electron microscopy provides information on the nature and extent of the pore system to a degree that cannot readily be visualized by the direct examination of fractured surfaces. The findings described concern human dentine but the technique may have a wider application in studies on the internal structure of other hard tissues.