TAC-20立柱铸件的工艺改进

分析了TAC-20立柱铸件的地坑组芯工艺和手工模样工艺两种方案的优缺点,详细介绍了手工模样铸造工艺方案.经生产验证,手工模样工艺较地坑组芯工艺提高了铸件的外观质量和生产效率,降低了劳动强度.     

盒内挤压锁芯成型工艺

为了提高摇枕、侧架铸造质量,提出了盒内挤压锁芯成型工艺,该工艺是摇枕、侧架整体芯主要生产工艺之一。文章主要阐述了整体芯工艺研制的背景以及制造整体芯工艺之一的盒内挤压锁芯成型工艺的基本原理、生产工艺流程、主要特点及应用情况。实践证明采用盒内挤压锁芯成型工艺生产的铸件表面质量好,热裂纹、砂眼、掉砂等缺陷大大减少;特别是采用该工艺可以使铸件内腔采用一个砂芯制出,消除了铸件的横向披缝,提高了铸件的抗疲劳性能。该工艺的成功实践为生产长大砂芯提供了新的工艺借鉴。     

油底壳铸件的工艺设计

针对砂型铸造生产大、中型薄壁油底壳类铝合金铸件,容易出现浇不足、夹渣、砂眼等铸造缺陷,根据多年生产实践经验总结,通过采用带过滤网的搭接式双向横浇道的浇注系统和组芯工艺,大大提高了铸件合格率,可以稳定生产出优质合格铸件.     

大型空腔铸件铸造工艺研究

以下凸模铸件为例,详细研究大型空腔铸件的铸造工艺.通过改进铸造工艺,解决了大型空腔铸件铸造过程中的漂芯、排气等问题,获得高质量的铸件产品.     

柴油机机体造型线旋臂下芯装置

武汉柴油机厂,于1975年对铸造车间进行技术改造,投产一条气动微振压实造型线,年产195柴油机机体件3万台,下芯一直由手工操作。生产效率低,劳动强度大,下芯精度难以保证,直接影响铸件质量的提高。随着生产的发展,柴油机机体件的品种和数量都在增加;对铸件质量的要求,也越来越     

EIZ80空分机壳铸造工艺

针对EIZ80机壳铸造工艺特点,采用组芯造型、抽芯式模型结构,运用均衡凝固理论设计浇注系统.采用分散3层阶梯式浇注系统,用陶管分别从铸件的底层、中间和最上层引入等工艺措施,成功浇注出铸件内在质量好,表面光洁,加工过程中无铸造缺陷的EIZ80机壳铸件,实现了国产化铸造.     

湿型砂造型和制芯过程数值模拟研究进展

造型是湿砂型铸造生产过程的核心环节,它的目标在于将松散的型砂紧实成为高紧实度的砂型.紧实度均匀、能抵抗金属液体冲击的合格砂型是保证铸件质量的关键因素之一.铸造技术的发展使得砂芯在铸造生产中的作用越来越大,被称为"精确砂型铸造"的组芯造型对砂芯的尺寸精度要求非常高.湿型砂造型和制芯过程的数值模拟可以预测砂型和砂芯质量,优化造型工艺,从而为生产高质量铸件提供重要保证.对湿型砂造型和制芯过程数值模拟的现状进行了分析,并提出了未来的发展方向.     

金属型铸造铝合金用水溶芯的试验研究

针对金属型铸造铝合金铸件时砂芯溃散性差的问题，研究了用水溶性热芯盒水玻璃砂芯代替树脂砂芯和油砂芯，改善砂芯溃散性的制芯工艺和水溶溃散工艺，降低了铸件生产成本，改善了劳动条件和环境质量。     

大型高铬铸件组芯造型技术研究

大型高铬铸件多为单件小批生产,按照常规工艺为其设计模型和铸造工装费用较高。研究组芯工艺可以节省或降低模型和其他工装费用,同样达到生产高质量铸件的目的。车间现有多个地坑,存在在地坑内造型的可行性。     

玉柴6112ZLG缸体下芯吊具的设计

在柴油机的大型零件缸体的铸造过程中,下芯吊具的设计是主要工艺环节之一,它对保证铸件缸体质量及尺寸精度等起着重要的作用.     

面向零件形状的计算机图形库的开发

论述了CAD技术中参数化设计的三种建模方法，重点介绍了基于特征的参数化建模原理。在此基础上，分析机械设计中的机构结构，归纳出其零件的几何特征构成。设计了机构CAD图形库，并提出了该图形库生成步骤和人机交互界面。     

FeCrAIW电弧喷涂层组织的致密化研究

采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合.     

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.     

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.     

Effect of the Error of Measurement of Current Harmonics on the Accuracy of Determination of Magnetic Characteristics

Metal Science and Heat Treatment - The effect of the error of measurement of the form of current harmonics on the accuracy of determination of weber-ampere characteristics of electrical devices is...     

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.