铸造场

Therefore it is necessary to research the mechanism of greensand used for high compacted molding methods thoroughly.This subject is one section of the National Natural Science Foundation subject ""Ivestigation on Predicting Method and Mechanism of Springback for High Compacted Sand Molds"", followed of the other completed one named ""Research on Microdeformation of Molding Sand"". A serious of experiments has been done on the reequipped three axial machine under certain technological conditions, and the mechanics, material science, rheologic science. It is systematically studied that the influences on the springback of sand mold were caused by the main influence factors: pressure, compacted rate and the content of soil. Through the analyzed experiments' data, the experienced stress-strain relationship concerning the main influence factors were obtained;under different technical parameter, the springback and spingback's potential energy are compared, the differences and indifferences between them are found out, and the springback's mechanism is discussed;according to the tests' data of YangGuoping coming from Tinghua University, experienced formula of molding sand's springback displacement is induced, the displacement and springback are compared, the margin of error's reasons are analyzed, and they are tested and verified mutually.

本课题为国家自然科学基金项目"高紧实度砂型预测方法及回弹机理的探讨"的一部分，是已结题的国家自然科学基金项目"铸造型砂微变形的研究"的后继，运用力学、材料学及流变学理论，利用改装的三轴仪，在一定的工艺条件下，作了大量系列实验，系统的研究了压实比压、紧实率和膨润土含量对砂型回弹的影响；对实验数据进行了分析和处理，得出了型砂关于压实比压、紧实率和膨润土含量的本构关系的经验公式；把各工艺参数下的型砂产生的回弹量与回弹势能进行比较，找出两者存在的异同点，并对回弹机理进行了探讨；通过清华大学杨国平的实验数据，推导出型砂回弹位移场的经验公式，并与实验测出的回弹量进行比较，分析误差造成的原因，并互相进行了验证。

The influence of low-frequency electromagnetic field on microstructure and morphology of primary Si particles of Al-19.2% Si alloy ingot specimens prepared by semicontinuous casting process was investigated with electronic optical microscopy, where the specimens were taken from different parts of the cast to which different electromagnetic fields are applied.

采用低频电磁半连续铸造技术制备Al-19.2% Si合金铸锭，利用电子光学显微镜对铸锭的显微组织进行分析比较，研究了电磁场强度和频率对初生硅颗粒形貌的影响；利用测温技术对合金的凝固过程进行监测，研究低频电磁场对凝固前沿温度场的影响。

Methods Simulated the process of firing and repolishing when fabricate porcelain fused to metal restoration in clinic, then observed the microstructures of alloys by Field Emission Scanning Electron Microscopy and X-ray energy spectrometer.

模拟临床合金铸造及烤瓷／抛光过程，借助场发射扫描电镜和X射线能谱仪，观察合金表面形貌和元素组成。

With the technique of wavelets analysis and neural network intelligence, aiming at numerical calculation of temperature field in casting process of camshafts, the arithmetic of wavelet neural network is described.

利用小波分析和神经网络智能技术，针对凸轮轴铸造充型凝固过程的温度场数值求解问题，提出了小波神经网络算法。

Through analyzing the temperature field and stress field of typical steel castings some casting parameters as modulus, the distance of feeding head, cold iron are validated and modified, which is in accordance with the production-lines.

通过选取典型的铸钢件，采用实验的方法，对温度场、应力场、模数、冒口补缩距离、外冷铁等铸造工艺参数进行验证并加以修改，使其符合生产实际。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷