摘要：提出了基于热模拟仪的镁合金挤压-一次剪切(extrusion-shear)二步复合制备工艺(简称ES工艺),设计并制造了适合于热模拟仪Gleeble1500D的ES热物理模拟装置,进行了热模拟实验,建立了基于DEFORM软件的ES挤压有限元数值模型,并进行了有限元模拟。研究了坯料变形过程的应变率、挤压力、应变-应力等物理量。从ES热物理模拟和数值模拟过程的挤压力、应变-应力曲线的特点,发现ES工艺中镁合金发生了特有的动态再结晶过程,具有明显的两个动态再结晶阶段,被称为"双级动态再结晶"。镁合金坯料的等效应变率在正挤压阶段,累积应变的值较小,发生了少量的动态再结晶,在经过一次剪切后等效应变率急速上升,发生了第二阶段的动态再结晶,镁合金坯料的微观组织经过挤压-剪切逐步细化。

摘要：介绍了库存管理系统的必要性及软件设计,针对铸造企业存在的问题提出解决方案,通过该方案实现了铸造企业信息共享,规范操作流程,统一铸件编码的目的。介绍了软件开发的需求分析、程序设计过程,阐述了软件系统开发的一些关键技术。

摘要：ES挤压极限图(挤压速度-温度机制)能够描述挤压剪切工艺参数对棒材质量的影响,并可优选挤压-剪切工艺参数,本文建立了AZ31镁合金的三维有限元热力耦合模型及计算机仿真条件,模拟了不同挤压速度和预热温度下,ES挤压过程的模口的温度演变和挤压力随时间演化规律,通过对模拟结果数据的线性拟合得到一系列的方程,根据这些方程初步建立了挤压比为32.1时的连续挤压剪切极限图。设计并制造了适合于卧式挤压机上的ES挤压剪切模具,通过挤压工艺试验对所得的挤压极限图进行了验证,结果吻合的很好。ES挤压极限图为设计和加工模具,为生产出表面质量合格的镁合金棒材提供了理论和实践依据。

摘要：To study the influence of roll casting process parameters on temperature and thermal-stress fields for the AZ31 magnesium alloy sheets,three-dimensional geometric and 3D finite element models for roll casting were established based on the symmetry of roll casting by ANSYS *** method and smart-sizing algorithm were used to divide finite element mesh in ANSYS software.A series of researches on the temperature and stress distributions during solidification process with different process parameters were done by 3D finite element *** temperatures of both the liquid-solid two-phase zone and liquid phase zone were elevated with increasing pouring *** the heat transfer coefficient increasing,the two-phase region for liquid-solid becomes *** the pouring temperature increasing and the increase of casting speed,the length of two-phase zone *** optimized of process parameters（casting speed 2 m/min,pouring temperature 640 ℃ and heat transfer coefficient 15 kW/（m2·℃） with the water pouring at roller exit was used to produce magnesium alloy AZ31 sheet,and equiaxed grains with the average grain size of 50 μm were achieved after roll *** simulation results give better understanding of the temperature variation in phase transformation zone and the formation mechanism of hot cracks in plates during roll casting and help to design the optimized process parameters of roll casting for Mg alloy.

摘要：为了提高箱体压铸件的质量,进行模具结构优化,解决了摩托车发动机箱体压铸件的气孔和缩松缺陷。主要采取的解决措施是对压铸模内浇口的设置和右端型芯进行修改。结果表明正确地设置内浇口对减少摩托车箱体的缺陷有很大的作用。本文所采取的修改方案以及研究方法对形状复杂的压铸件的模具设计有重要的指导意义。

摘要：金属 (陶瓷 )粉末注射成型技术 (MIM/CIM)是一种新型的零部件近净成型技术。

摘要：针对镁合金的棒材的工业化制备和加工,提出了一种新型的镁合金复合挤压方法,将正挤压(Extrusion)和剪切(Shear)结合(简称ES),建立了ES挤压的三维有限元热力耦合模型及条件,模拟了ES挤压的流动网格、累积应变演化,设计并制造了适合于卧式挤压机上的ES挤压模具,进行了ES工艺实验。数值模拟结果表明,ES挤压可以显著提高镁合金变形过程的累积应变;试验结果表明,ES挤压可以得到尺寸很小的动态再结晶晶粒,并改善了组织均匀性;理论分析表明,ES挤压过程镁合金具有多级动态再结晶的特性,可以逐步有效的细化微观组织。ES挤压在模具结构、工艺参数合理的条件下可以大大细化镁合金微观组织,并具有工业生产的实用性。

摘要：介绍了以UG/KF(Unigraphics/Knowledge Fusion)为开发平台的镁合金压铸模KBE系统,并以压铸模浇注系统设计为例对建立的系统知识库、功能模块及其程序实现流程进行了详细分析;充分利用UG软件现有的CAD/CAM/CAE功能,将KBE技术紧密结合压铸模设计理论与实践的经验,确定了系统的体系结构。

摘要：本文分析了镁合金管材普通挤压成形应用发展的技术瓶颈和内在根源,总结了各种塑性变形工艺和稀土元素对镁合金管材组织性能的影响及基本原理、特点。分析了多道次等通道挤压、平行管道等通道挤压-反向挤压等多道次大塑性成形工艺及管材组织特征,发现多道次大塑性变形可改进组织,但成本高、工艺复杂;综述了单道次复合大塑性成形如管状等通道挤压、循环膨胀-挤压、旋转-反向挤压、挤压剪切塑性成形工艺等工艺原理及管材的组织特点,表明单道次复合大塑性成形工艺简单;通过在镁合金中添加微量稀土元素,能够弱化或随机化变形织构,强度和塑性都能得到较大提升。论文对镁合金管材塑性变形工艺的原理进行了分析及总结,指出了采用单道次新型复合大塑性成形工艺及低稀土镁合金作为管材材料,进行有效的晶界与织构设计是提高镁合金管材质量的有效途径,论文对相关研究进行了展望,总结了目前亟待解决的问题。

摘要：A new severe plastic deformation （SPD） method that is extrusion-shearing （ES）, which includes initial forward extrusion and shearing process subsequently, was developed to fabricate the fine grained AZ31 Mg alloys. The components of ES die were manufactured and installed to gleeble1500D thermo-mechanical simulator. Microstructure observations were carried out in different positions of ES formed rods. The results show that homogeneous microstructures with mean grain size of 2 μm are obtained at lower temperature as the accumulated true strain is 2.44. Occurring of continuous dynamic recrystallization （DRX） is the main reason for grain refinement during ES process. The experimental results show that the ES process effectively refines the grains of AZ31 magnesium. The production results of ES extrusion with industrial extruder under different extrusion conditions show that the ES extrusion can be applied in large-scale industry.