基于人工智能技术的跨平台镁合金压铸模设计智能专家系统研究

利用基于人工智能技术的跨平台镁合金压铸模设计智能专家系统,以某笔记本电脑前壳盖的镁合金压铸模为对象,介绍了使用现代化设计工具设计镁合金压铸模的流程。新的智能专家系统加入人工智能技术后更加高效,可自主学习,解决了设计人员设计过程跟不上CAD软件步伐的问题,对高效快速设计镁合金压铸模提供参考。     

基于大数据分析的镁合金压铸模CAD集成系统研究

以镁合金笔记本电脑前盖压铸模设计为例,介绍了基于大数据分析的压铸模CAD集成系统设计压铸模的一般过程。该系统不仅可以快速、合理地设计压铸模的侧抽芯和复杂的型腔结构,还可以查询压铸模设计的相关专业数据和计算公式,根据大数据分析,指导压铸件及相关模具的设计。实践表明,该系统能快速完成复杂型腔压铸模的设计,对复杂镁合金压铸模的设计具有参考价值。     

变速箱操纵盖压铸模设计方案改进

通过对五十铃变速箱操纵盖压铸模设计方案的分析与改进 ,提高了产品合格率 ,延长了模具使用寿命 ,并阐明了合理设计与布置浇注系统在压铸模设计中的重要性。     

齿轮箱壳盖镁合金压铸模

齿轮箱壳盖镁合金压铸模上海第一汽车附件厂徐国霖壳盖压铸件模具是我厂引进德国压铸机时一起带来的旧模具，该压铸机合模力为１１００ｔ。我们对压铸机、压铸模进行安装、调试，并压铸出一批镁合金壳盖铸件，因旧模具寿命已到，对壳盖压铸模进行了设计、仿制，使之国产化...     

汽缸盖压铸模的电火花成型加工

<正> 摩托车汽缸盖压铸模是典型的较复杂的窄深槽型腔模具。南阳地区电加工学会最近为国营中原电梯厂完成了摩托车汽缸盖压铸模电火花成型加工任务。结束了该模具依靠进口的历史。本文针对该模具的结构、电极设计与制造、电加工规准选择等加工工艺作一介绍,供参考。     

摩托车右曲轴箱盖压铸模设计

分析了右曲轴箱盖铸件的结构和成型工艺特点,设计了该铸件压铸模具结构,介绍了该模具浇注系统、冷却系统、抽芯机构设计.     

压铸模数字设计中的虚拟装配策略研究

虚拟装配是实际装配过程在计算机上的实现。通过实例探讨了虚拟装配方案规划问题，介绍了一种基于子装配的装配结构模块化虚拟装配策略，并运用这一策略对阀盖压铸模进行了虚拟装配；改进了现有虚拟装配方式，提出了同步虚拟装配策略并给出了实现方法。作为数字设计的组成部分，同步虚拟装配简化了虚拟装配的工作过程，为面向装配的数字设计提供了手段，对于分析、评价和完善设计对象，确保实际制造一次成功有重要意义。     

15—C右箱体压铸模具的设计

本文分析了摩托车左、右箱体、右箱盖铸件采用卧式中心浇口所产生的缺陷,提出了改进压铸模具设计的方法。     

基于PLC的压铸模具温度智能控制系统设计

传统的压铸模具温度控制主要依靠人为主观经验,借助脱模剂降低模温,存在潜在的压铸质量和模具使用寿命问题。针对该现状,通过调配组合阀冷却水流量设计了一种适合压铸模具的智能调温控制系统。系统硬件采用三菱FX机PLC,通过组合阀和PID控制冷却水流量,设计预热、连续压铸温度保持功能。系统软件基于GXDeveloper开发,给出了PID自动调谐温度的梯形图程序。经实际应用表明,所设计的压铸模温调控系统运行稳定,满足预热和连续压铸对模具温度的要求。     

二次脱模压铸模具设计

运用公式对气缸前盖压铸模型芯成形部位进行推出力计算,并分析受推面设置的局限性,采用特殊的二次脱模设计,使铸件在推出时的开裂及变形现象得到有效解决。详细介绍了有利推出铸件的二次脱模压铸模具设计方法及应用过程,它是有效提高铸件质量的方法之一。     

Prospects of the Use of Synergetic Approach to Solution of Problems of the Science of Nanomaterials

A synergetic approach to solution of problems of self-controlled synthesis of nanostructures and creation of self-organizing nanotechnologies is considered in connection with the superproblem of creation of materials with functional properties resembling those of biosystems. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 55 – 61, July, 2005.     

Kinetics of the oxidation of metals — Influence of self-diffusion of metal

The importance of the self-diffusion of a metal during its oxidation by a gas is treated for the cases of nonstoichiometric oxides having either interstitial cation or cation vacancies. We have established a general relationship for the reaction rate when a mixed diffusion process occurs. From this relationship, we have shown that the pressure dependence can be different, according to whether the rate-determining process is the self-diffusion through the metal or through the product.     

Features of formation of the structure in production of blanks of disks of heat-resistant nickel alloys

Conclusions To provide a high level of mechanical properties in wrought blanks of cast ÉP741NP and ÉP962 alloys it is necessary to form controlled structures. A necklace-type structure formed in homogenizing isostatic treatment, subsequent thermomechanical working including alternation of the operations of deformation in the (+)-area and recrystallization anneals, and final heat treatment is preferable. The temperature conditions of all stages of thermomechanical working are strictly controlled, especially the final operation of deformation and heating for hardening. To eliminate hardening cracks and distortions it is necessary to use molten salts at t=600°C as quenchants. The use of multiple production operations makes it possible to significantly reduce the structural inhomogeneity related to inhertance of the original dendritic structure. However, the structure of the final semifinished product is nevertheless characterized by a difference in occurrence of the processes of polygonization and recrystallization between the former dendritic cells and the interdendritic spaces in deformation and heat treatment.To obtain structurally homogeneous blanks for gas turbine engine parts it is necessary to use basically new methods of remelting such as vacuum double electrode remelting and electron beam remelting with an intermediate vessel.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 25–29, December, 1991.     

Ab-initio calculation of enthalpies of formation of intermetallic compounds and enthalpies of mixing of solid solutions

A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described.     

试论洋务派教师聘任的思想

洋务派在洋务学堂的办学活动中,为了解决西学专业学科的教学困难,采用了聘请外籍教师的应急措施.他们以真才实学,合同制管理作为主导思想,并认为这种解决师资的途径只是权宜之计,并非久远.从客观上看,洋务派的教师聘任思想有深刻的历史影响.     

胫骨生物陶瓷复合材料的微结构增韧机理

扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性.     

Mechanism of Nucleation of Precipitates of Carbides of Refractory Metals Under Hot Rolling of Automotive Sheet Steel

Metal Science and Heat Treatment - The problem of formation of properties in microalloyed sheet steels is considered. The cause and the possible mechanism of precipitation of carbides of refractory...     

燃煤机组锅炉烟气脱硝灰中氨含量测定

NOx是大气环境的主要污染物之一,其主要来源为火力发电机组。依靠低氮燃烧技术,远达不到排放要求。选择性催化还原脱硝(简称SCR)技术是目前效率最高、最成熟、应用最广泛的电厂烟气脱硝技术。目前,在线氨逃逸监测技术存在诸多问题,影响了氨逃逸监测数据的准确度和稳定性。在燃料种类、炉膛结构、受热面布置、过量空气量、炉膛气流分布以及脱硝催化剂类型等条件确定的情况下,控制好氨加入量及其逃逸量是保证NOx脱除率的关键所在。燃煤锅炉除尘飞灰氨含量可侧面反映脱硝氨逃逸率的状况。根据国外的文献报道,正常情况下,电除尘灰中氨含量一般在50mg/kg-100mg/kg范围内。由于国内尚无灰中氨含量的测定方法,亦无脱硝运行对飞灰含氨量影响的数据积累。本文通过大量试验,确定了灰中氨溶解条件(如溶解时间、搅拌状态、灰水比、灰样量及其稳定性等),制定了灰中氨含量测定方法。