微波功率管壳用焊料浇铸模的设计与制造

介绍一种微波功率管壳用焊料的模具的设计、制造工艺、表面处理和测量方法。     

环形锻件钢坯铸钢模上出模斜度的研究与应用

分析了环形锻件终锻成形前的预锻件,即:铸钢坯在浇注成形时使用模具的型腔结构对其铸钢坯的质量有严重影响的主要因素,如对型腔表面出模斜度值的改进提出了新的技术方案。     

NUMERICAL SIMULATION OF CASTING＇S MOLD FILLING PROCESS

Numerical simulation of casting＇s mold filling process is the main and the most important aspect of the foundry CAE technology. But it is time-consuming; it may take dozens of hours or several days. While with the development of computer hardware, numerical simulation of casting＇ s mold filling process has made rapid progress. The simulation results, therefore, have become more and more practical. This study tries to find some clues of the computational time of mold filling process. Firstly, this paper introduces mathematic model and the basic route of numerical simulation of casting＇s mold filling process. Then the computational time of mold filling process has been carefully studied, and some new and useful results have been gained from the study of the computational time. Finally, this paper has given some real applications of numerical simulation of casting＇s mold filling process.     

陶瓷型精铸工艺

介绍陶瓷铸模的优点、制模工艺和关键技术。     

基于事例推理技术的涡轮叶片精铸模分模设计研究与应用

飞机发动机涡轮叶片的内部结构相当复杂，这给叶片模具的分模设计带来了很大的困难。通过对传统手工分模设计过程的分析，并针对分模设计经验依赖性强的特点，指出基于事例推理的分模设计方法的可行性，构建了基于事例推理的涡轮叶片分模设计系统框架，解决了分模设计的分模知识提取、分模事例描述、分模事例检索、分模事例修改等关键问题。最后给出了系统运行实例，表明能够提高设计效率，减少设计难度。     

真三维成像系统结构设计及GR空间模型分析

本文提出了一种基于下投影的真三维立体成像显示系统。讨论了一种基于空间和时间的三维模型体素构造的新方法——体素铸模法,并推导了四维局部状态空间模型Givone-Roessor,此模型利用状态矢量和输入矢量计算和表征体素变量,模型在某时刻计算的各变量只与相邻的体素或前一时刻有关,减少了计算量。系统机械结构简单轻便,成本低,功耗小;视场角大,除天顶点外,在整个x-y平面以上的半球空间均可成立体像;Givone-Roessor模型计算量小,便于微控制器实现,为真三维立体成像显示提供了一种新方法。     

延长银铸型模寿命的探讨

分析了银铸型模在使用过程中产生裂纹的原因，提出了七项消除或减少铸模裂纹的行之有效的措施，改进后铸模的寿命由平均每个2．34t提高到5．14t，吨银锭的铸模消耗降低120％，仅节约铸模每年为企业增加效益13万元，且银锭表观质量显著改善。     

Numerical Simulation of Heat Transfer and Deformation of Initial Shell in Soft Contact Continuous Casting Mold Under High Frequency Electromagnetic Field

  Heat transfer and deformation of initial solidification shell in soft contact continuous casting mold under high frequency electromagnetic field were analyzed using numerical simulation method; the relative electromagnetic parameters were obtained from the previous studies. Owing to the induction heating of a high frequency electromagnetic field (20 kHz), the thickness of initial solidification shell decreases, and the temperature of strand surface and slit copper mold increases when compared with the case without the electromagnetic filed. The viscosity of flux decreases because of the induction heating of the high frequency electromagnetic field, and the dimension of the flux channel increases with electromagnetic pressure; thus, the deformation behavior of initial solidification shell was different before and after the action of high frequency electromagnetic field. Furthermore, the abatement mechanism of oscillation marks under high frequency electromagnetic field was explained.     

膨胀石膏电镀制模工艺

<正> 膨胀石膏模已很早在电讯仪表、医疗器材、日用五金的砂型、陶型模具中应用,但因其强度、硬度、耐腐性能不佳,而使应用具有局限性。我们通过一些探讨即在石膏表面进行电镀加工,使石膏表面覆盖一层金属层,实验表明膨胀石膏可自行弥补如塑料工件本身的收缩量,最大的可达3％,确保工件的尺寸精度,减少了生产周期和成本,其硬度、强度、耐腐性能部比原来提高十几倍,