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die casting defects
相关语句
  压铸缺陷
     Construction of DCES Expert System For Die Casting Defects and Their Countermeasure
     DCES压铸缺陷及对策专家系统构造原理
短句来源
     After an in-depth description of characteristics and forming mechanism and conditions of various die casting defects, the measurements of quality control and defects elimination were suggested.
     根据镁合金压铸成形原理,分析了常见压铸缺陷的特征、形成机理及产生原因,并分析了压铸合金种类、压铸工艺对压铸件产品质量的影响,提出相应的解决措施。
短句来源
  相似匹配句对
     die-casting.
     压铸法。
短句来源
     The Defects of Die-Casting Parts and Related Analysis
     压铸件的缺陷及分析
短句来源
     Study on Computer Simulation and Forecast on Casting Defects for Die Casting
     压铸件铸造缺陷的计算机模拟与预测研究
短句来源
     Die casting of Jiangsu P. R. China
     中国江苏的压铸业
短句来源
     Repairing the Casting Defects with Adhesive
     用粘合剂修补铸件缺陷
短句来源
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The construction of an expert system for the die casting defects analysis and their corrective countermeasures are introduced. On the basis of gathering the field knowledge, the common die casting defects, their causes and corrective countermeasures occurring during die casting process are summarized, and their logical relationship is established. The defects are divided into three basic categories covering geometric defects, surface defects and internal defects....

The construction of an expert system for the die casting defects analysis and their corrective countermeasures are introduced. On the basis of gathering the field knowledge, the common die casting defects, their causes and corrective countermeasures occurring during die casting process are summarized, and their logical relationship is established. The defects are divided into three basic categories covering geometric defects, surface defects and internal defects. The first procedure for solving a defect is to identify defect, then relative coefficient and parameters being used are checked to determine the real causes for a particular defect. At the third step, corrective suggestions are given with corrective sequence and corrective quantity. Three sub knowledge bases are employed to store field knowledge such as defect diagnosis, corrective countermeasures and recommended process conditions for different alloys and different die castings. According to the characteristic of the field knowledge, production rule, frame and procedure are used as knowledge representation scheme. Forward chaining and fuzzy inference as well as priority value inference mechanisms are introduced to solve the die casting defects. The system simulates the resolution technique employed by human expert in eliminating or reducing die casting defects.

本文介绍了DCES压铸缺陷及对策专家系统的构造原理。在广泛收集领域知识的基础上 ,对压铸过程中常见的缺陷、原因及对策进行了归纳整理 ,确定了三者之间的逻缉对应关系。采用了产生式规则、框架及过程等知识表达方式 ,使用正向和模糊推理机制及优先权法求解策略 ,较好地应用了领域专家处理压铸缺陷时的思路和方法。

The computer simulation and forecast of die casting defects is an important and effective way to improve the quality of die casting. In this paper,we focus our study on a complex workpiece of die casting. At first, an algorithm of numerical simulation for the temperature field of die casting during the solidification process is presented.On the basis of temperature field numerical simulation results,a new method to forecast the casting defects such as shrinkage...

The computer simulation and forecast of die casting defects is an important and effective way to improve the quality of die casting. In this paper,we focus our study on a complex workpiece of die casting. At first, an algorithm of numerical simulation for the temperature field of die casting during the solidification process is presented.On the basis of temperature field numerical simulation results,a new method to forecast the casting defects such as shrinkage and gas hole is advanced.Some reasons,such as structure and temperature change are employed to analyse the formation of shrinkage ,dispersed shrinkage and gas hole.The algorithm to forecast these casting defects is presented.The forecasting results correctly anastomose the facts of die casting defects.Finally the visualization of the numerical computation is achieved to make the view of results simple and intuitive.

压铸件铸造缺陷的分析及预测研究对保证压铸质量具有非常重要的意义。针对复杂、小型、薄壁压铸件的收缩缺陷 ,综合考虑了压铸件形状及其凝固过程中温度变化对缩孔缩松及气孔发生的影响机理 ,在其凝固过程温度场数值模拟的基础上提出了一种新的压铸件缩孔缩松判据。应用该判据对压铸件收缩缺陷和气孔缺陷的发生及危险部位进行了模拟预测 ,并对模拟预测的结果进行了可视化显示。预测结果与压铸件缺陷实际发生情况一致。

The connective weight updating mechanism of Back error Propagation (BP) neural network, especially its improved update algorithm was analysed. With Matlab neural network toolbox, the BP algorithm was adopted to simulate selection criteria of pouring temperature under different alloy category and die cavity complexity, and die casting defects pattern recognition, based on the method of constant learning rate plus momentum, and the method of adaptive learning rate plus momentum respectively. By comparing...

The connective weight updating mechanism of Back error Propagation (BP) neural network, especially its improved update algorithm was analysed. With Matlab neural network toolbox, the BP algorithm was adopted to simulate selection criteria of pouring temperature under different alloy category and die cavity complexity, and die casting defects pattern recognition, based on the method of constant learning rate plus momentum, and the method of adaptive learning rate plus momentum respectively. By comparing the training efficiency of the two algorithms, it is concluded that the BP neural network algorithm based on adaptive learning rate is more efficient for simulating processing mapping relations in die casting. The results of simulation testing for the networks were provided.

对于误差逆传播 (BP)神经网络标准及改进型算法中的神经元联接权更新机制进行了分析。作为实际应用 ,基于MATLAB神经网络工具箱函数 ,研究了两个例子 ,一个是不同合金种类及不同复杂程度的型腔结构下浇注温度的选择 ;另一个是压铸工艺的缺陷分析。采用的算法分别为恒定学习率 附加动量项改进型BP算法和自适应学习率 附加动量项改进型BP算法。通过在实际模拟中比较这两种算法的训练效率 ,可得到结论 :自适应学习率 附加动量项算法是精确模拟压铸工艺映射问题的较为理想的方法。基于这一方法 ,文中最后给出了网络模拟测试的结果

 
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