基于RS-485的远传式SF6密度继电器的研究

处于复杂电磁环境下的电网设备,其SF6数据信息在远传过程中会受到一定程度的干扰,因此研究一种抗干扰远传式SF6气体密度继电器非常重要.介绍了SF6气体密度继电器的基本原理,并以RS-485通信技术为基础,探讨了基于RS-485的远传式SF6气体密度继电器.     

液压式二工位型壳脱壳机的控制系统设计

介绍了液压式二工位型壳脱壳机的控制系统设计。该型壳脱壳机利用液压冲击力对精铸件进行脱壳处理，具有自动化程度高、工作噪音低、粉尘少等特点，可改善工人劳动条件，提高精铸件的成品率。     

钢件的甲酰胺高温气体碳氮共渗

应用气体渗碳的计算机精确控制技术，对常用低碳钢（AISI8720）进行了高温气体碳氮共渗试验，对不同渗碳条件（在不同时间加入不可比例的甲酰胺）下低碳钢的渗层深度和硬度进行了测定和比较分析，得出渗氮介质比较例、时间等因素对于高温气体碳氮共渗过程的影响规律。     

Evaluation of Process Capability in Gas Carburizing Process to Achieve Quality through Limit Design Concept

NUMEROUS INDUSTRIAL APPLICATIONS requirea hard wear-resistant surface called the case,and arelatively soft,tough inside called the core.There arefive principal methods of case hardening:?Carburizing?Nitriding?Cyaniding or carbonitriding?Flame hardening?Induction hardeningThe first three methods change the chemicalcomposition,carburizing by the addition of carbon,nitriding by the addition of nitrogen and cyaniding bythe addition of both carbon and nitrogen.The last twomethods do n…     

Flexible Furnace Concepts for Vacuum Heat Treatment Combined with High-pressure Gas Quenching

IN the past five years the process combination of vacuum hardening, respectively vacuum carburizing with high-pressure gas quenching was successfully introduced to the market, especially in the manufacture of gears. In the meantime furnace concepts for various applications are available to the industry. In the following report three plant varieties are introduced, which differ in process flexibility and throughput. This report also explains criteria for the selection of a furnace in view of the existing application requirements. Besides this a short introduction is given into the vacuum carburizing process and the high-pressure gas quenching technology.     

电弧喷涂枪的研究与设计

研究了喷涂电弧特点、喷嘴理论以及目前国内外最常用电弧喷涂枪的结构及其特点，提出了2种改进设计方案，最后介绍了电弧喷涂喷枪的最新发展状况。     

气体氮碳共渗钢板表面粗糙度和形貌的研究

研究了抛光冷轧钢板气体氮碳共渗时氨流量对共渗层表面粗糙度和形貌的影响。用扫描电镜和表面粗糙度仪对氮碳共渗层的表面形貌进行观察和测定。结果表明，随氨流量的增大，氮碳共渗层表面的粗糙度减小，表面组织细小致密。当氨流量小于1．0m^3／h时，表面粗糙度随共渗时间的延长逐步增大。钢板表面粗糙度与工件在炉中的位置和排布方式以及氨分解率有关。     

易切削钢冲击断口分维的随机分形分析

建立横向冲击时易切削钢裂纹扩展的随机分形模型，计算了冲击断口的随机分形维数Ｄ，比较和分析了Ｄ、非随机分形维数与实测分形维数。结果表明随机分形断裂模型与实验数据完全吻合。     

Numerical simulation of gas metal arc welding temperature field

The infrared camera is used to investigate the temperature field of gas metal arc welding.The results show that the temperature distribution of weld pool and adjacent area appears cone shape.A new heat source model combined by Gaussian distribution heat source of the arc and conical distribution heat source of the droplet is set up based on the experimental results, and with the combined boundary conditions,the temperature field of gas metal arc welding is simulated using finite element method.According to the comparison between the results of experiment and simulation in temperature field shows that the new combined heat source model is more accurate and effective than the Gauss heat source model.     

雾化参数对H70黄铜粉末粒度及其分布的影响

气雾化生产金属粉末是一个复杂的过程,影响因素较多.为制备较细粉末需求最佳的工艺参数组合,应用气体动力学和流体力学分析了雾化气体压力、金属熔体温度和导液管内径对H70黄铜雾化粉末粒度及其分布的影响.结果表明:适当地提高气体压力和金属熔体温度或者减小导液管内径均能使雾化粉末粒度增大,当雾化气体压力为1.3 MPa,金属熔体温度为1 160 ℃时,导液管内径为3.5 mm时,所制得的粉末的粒度及其分布均达到最佳效果.