铁塔主材加工自动线的电气设计

文中介绍了鞍山铁塔厂的ZHS—KX01型铁塔主材加工自动线上采用的FANUC—BESE—5M系统在应用设计中解决的两个技术问题。图3幅。     

轿车发动机缸盖凸轮轴轴承盖加工数控组合机床自动线

介绍了轿车发动机缸盖凸轮轴轴承盖多品种加工数控组合机床自动线的总体布局、工艺方案以及线上采用的关键技术,并对部分重要部件作了较详细的叙述。     

QC4112缸体加工自动线研制

文章介绍了研制QC4112缸体加工自动线的目的和该自动线所达到的研制要求,着重对缸体加工基准的传递、加工工艺路线的确定,加工流程该线,自动线主要组成部分进行了论述,同时对自动线采用的新工艺、先进技术手段等进行了详细表述.对这条自动线的先进性和达到的效果进行了总结.     

神龙公司缸盖4条加工自动线简介

文章介绍了神龙公司的加工缸盖顶底面、两侧面、两端面、气门导管、阀座和火花塞孔的4条加工自动线的工艺内容、精度要求、自动线的布局及结构特点.     

轿车发动机缸盖凸轮轴轴承盖加工数控组合机床自动线（续）

￥大连组合机床研究所＠潘滨＠刘仁义＠孙敬阳＠邓旭军＠关忠民＠徐英组合机床自动线,数控,发动机缸盖凸轮轴轴承盖２自动线的主要结构部件２１二坐标（ｘ,ｚ）精密数控十字滑台在８６线上能否确保４５９Ｄ零件的２－８Ｄ１０工艺孔位置精度（±００２ｍｍ）,是该自动线...     

配有桁架机械手、可换箱机床的缸体柔性加工自动线的开发研制

讨论了一条由加工中心、可换箱机床、斜孔钻机床组成的缸体自动线的设计方案,并对整条自动线的布局、结构、工作原理、输送形式及数控系统等做了较为详细的介绍.该自动线的成功研制和应用,结束了国内用户依赖进口该类产品的现状.     

手扶拖拉机最终传动箱壳体加工自动线

本文介绍了东风—12型手扶拖拉机左右最终传动箱壳体加工自动线的概况、加工特点及使用效果。     

基于HSCAE的电器外壳注射模优化设计

采用HSCAE软件对电器外壳的注射成型过程进行了模拟,分析了塑件翘曲变形的原因并提出了改进措施,对塑件成型工艺进行了优化,提高了塑件成型质量和生产效率,为类似塑件的注射模设计提供了理论依据。     

气缸盖缺陷分析及预防

针对气缸盖铸件孔洞缺陷提出了不同的见解,并从对缺陷的认识、缺陷原因分析及预防措施等方面进行了全面认证。     

嵌入式风缸盖工艺与模具设计

分析了嵌入式风缸盖的工艺特点,确定了最终的加工工艺,介绍了拉深模和落料模的设计思路、模具结构特点。生产证明,嵌入式风缸盖的制作工艺可行,拉深模和落料模设计合理,取得了较好的效果。     

Computational fluid dynamics analysis of a wire-feed, high-velocity oxygen fuel (HVOF) thermal spray torch

The fluid and particle dynamics of a high-velocity oxygen fuel (HVOF) thermal spray torch are analyzed using computational and experimental techniques. Three-dimensional computational fluid dynamics (CFD) results are presented for a curved aircap used for coating interior surfaces such as engine cylinder bores. The device analyzed is similar to the Metco diamond jet rotating wire (DJRW) torch. The feed gases are injected through an axisymmetric nozzle into the curved aircap. Premixed propylene and oxygen are introduced from an annulus in the nozzle, while cooling air is injected between the nozzle and the interior wall of the aircap. The combustion process is modeled using a single-step, finite-rate chemistry model with a total of nine gas species which includes dissociation of combustion products. A continually fed steel wire passes through the center of the nozzle, and melting occurs at a conical tip near the exit of the aircap. Wire melting is simulated computationally by injecting liquid steel particles into the flow field near the tip of the wire. Experimental particle velocity measurements during wire feed were also taken using a laser two-focus (L2F) velocimeter system. Flow fields inside and outside the aircap are presented, and particle velocity predictions are compared with experimental measurements outside of the aircap. This work was performed at Sandia National Laboratories, which is operated by Lockheed Martin for the U.S. Department of Energy under contract DE-AC04-94AL85000.     

一种大型锻造压机液压缸缸体和柱塞起吊工具

大型锻造压机液压缸缸体和柱塞重量非常大,由于液压缸缸体和柱塞表面为精加工光滑圆柱体,无法安置起吊装置,安装如此巨大的缸体和柱塞非常困难。本文介绍了一种大型挤压机立柱螺母的安装工具,装置在装配现场使用效果良好,不仅解决了大型挤压机液压缸缸体和柱塞起吊安装困难、易发生安全事故的问题,而且避免了安装过程中损伤缸体和柱塞精加工表面的现象。     

Synthesis,characterization, mesomorphic and electrical properties of tetrakis(alkylthio)-substituted lutetium(III) bisphthalocyanines

The synthesis of new lutetium(III) bisphthalocyanines substituted with alkylthio groups (1–5) is described. These compounds (Pc₂Lu) are soluble in most common organic solvents and have been fully characterized (elemental analysis, FT-IR, UV–Vis spectroscopy, mass spectrometry). The thermal stabilities of the Pc compounds were determined by thermogravimetric analysis (TGA). The mesogenic properties of these new materials forming columnar-hexagonal (Col_h) mesophases were studied by differential scanning calorimetry (DSC), optical microscopy and X-ray diffraction. The compounds 2–5 exhibit a double clearing point. DC electrical properties of these compounds in different phases were determined by measuring I–V characteristics and dark current of their thin films on interdigital electrodes. The measurements were carried out in ambient air, in vacuum and in high purity nitrogen (N₂) flow in the temperature range between 300 and 420 K. Dark current measurements obtained in the crystal, liquid crystal (LC) and isotropic liquid phases were in agreement with the phase transitions of these compounds obtained by DSC and optical microscopy results. The relation between the phase transition and conductivity of the Pc₂Lu derivatives were investigated. Also, the influence of the nature of the substituted group (alkylthia and alkoxy) upon the DC electrical properties of the Pc₂Lu derivatives was investigated. The DC conductivities and the thermal activation energies depending on alkyl chain lengths of these compounds were found to be in the range of 10^?8 to 10^?5 S/cm and 0.12–0.38 eV in solid phase.     

Optical,electrical and electrochemical characterization of electrosynthesized polythieno(3,2-b)thiophene

A new conductive polymer is prepared by electropolymerization of thieno(3,2-b)thiophene. Electrochemical characterization by cyclic voltammetry shows that it can be repeatedly driven between the doped and the undoped species. The FT-IR spectra of both materials are compared and the electrical conductivity is shown to be 3 × 10⁻⁶ S cm⁻¹.     

斜滑块顺序抽芯延迟顶出注射模设计

根据塑件的结构特点,设计了1副多向侧抽芯注射模,模具采用斜滑块侧抽芯装置,实现了多向及L形顺序侧抽芯功能,利用开合模运动完成了各向抽芯、延迟顶出、锁紧及侧型芯复位等动作,简化了模具结构,降低了成本。     

Quantitative models for microstructure and thermal conductivity of vermicular graphite cast iron cylinder block based on cooling rate

The relationships of cooling rate with microstructure and thermal conductivity of vermicular graphite cast iron(VGI) cylinder block were studied, which are important for design and optimization of the casting process of VGI cylinder blocks. Cooling rates at different positions in the cylinder block were calculated based on the cooling curves recorded with a solidification simulation software. The metallographic structure and thermal conductivity were observed and measured using optical microscopy(OM), scanning electrical microscopy(SEM) and laser flash diffusivity apparatus, respectively. The effects of the cooling rate on the vermicularity, total and average areas of all graphite particles, and the pearlite fraction in the VGI cylinder block were investigated. It is found that the vermicularity changes in parabola trend with the increase of cooling rate. The total area of graphite particles and the cooling rate at eutectoid stage can be used to predict pearlite fraction well. Moreover, it is found that the thermal conductivity at room temperature is determined by the average area of graphite particles and pearlite fraction when the range of vermicularity is from 80% to 93%. Finally, the quantitative models are established to calculate the vermicularity, pearlite fraction, and thermal conductivity of the VGI cylinder block.     

直接甲醇燃料电池阳极催化剂载体的研究进展

阳极催化反应的反应动力学缓慢是限制直接甲醇燃料电池(DMFC)技术发展的主要原因之一,其中催化剂载体对阳极催化反应有重大影响,载体材料的选择对于决定催化剂乃至燃料电池的性能、效率、稳定性和成本都至关重要。基于对30多篇文献的分析,本文分类综述了用于DMFC碳基催化剂载体包括炭黑、介孔碳、碳纳米管(CNTs)、石墨烯和碳纤维纸,非碳基催化剂载体包括金属有机框架(MOF)、新型二维材料MXenes、钛基材料等材料的研究进展。