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Yinchuan, China

Cui G.,Kocel Chemicals Co. | Hu G.-Q.,Kocel Steel Foundry Co. | Yang Y.,Kocel Chemicals Co.

Influences of the various factors on the working time and tensile strength of furan resin sand were mainly studied. By using Minitab software, the obtained data were analyzed, and the regression equation between the working time, tensile strength and various factors was obtained. The influence level of various factors on the results was determined. Source

Zhang J.-Y.,Ningxia Kocel Group Co. | Ma J.,Kocel Steel Foundry Co. | Li S.-Y.,Kocel Steel Foundry Co.

The effects of different normalizing temperatures and tempering temperature on mechanical properties of GX8CrNi12 steel nuclear steamseal body were studied. The results showthat with the increasing of normalizing temperature, the strength and hardness increased, ductility and toughness decreased; with the increasing of the tempering temperature, the strength, hardness and impact toughness decreased, while the elongation and reduction of area both the plasticity index increased first and then decreased. Different process parameters corresponding to the value of themechanical properties were obtained. The experiences and data for the further production of steel castings and use ofmaterialswere accumulated. Source

Yan X.-F.,Kocel Steel Foundry Co. | Li S.-Y.,Kocel Steel Foundry Co. | Ma W.-Z.,Kocel Steel Foundry Co. | Zhang X.-P.,Kocel Steel Foundry Co.

With numerical simulation and experiments, thermophysical parameters of molding sands used in foundry were investigated. The results show that the temperature of molding sands vary evidently while the distance between the casting and sand changes. The thermal conductivity of sands changes like a V shape as temperature increasing. Namely, with temperature increasing, the thermal conductivity falls when the temperature is less than 400℃ and then increases when temperature is more than 400℃; with temperature increasing, the specific heat of sands increases; when temperature is less than 600℃, specific heat increases remarkably, but slowly when temperature more than 600℃. © 2015, Chinese Mechanical Engineering Society. All right reserved. Source

Long H.-M.,Tsinghua University | Lu Y.,Tsinghua University | Kang J.-W.,Tsinghua University | Nie G.,Tsinghua University | And 2 more authors.

Insulating brick is widely used in casting production. Its specific heat capacity is one of the important thermal properties and crucial for numerical simulation of solidification process. Because of its porous characteristic, it is hard to measure the specific heat capacity at high temperatures. In this paper, a half-open dynamic measurement method based on hybrid principle was presented and a measurement device was established. Sapphire with given standard value of specific heat capacity is used to calibrate the system; the error is less than 6.3%. Specific heat capacity of two different kinds of insulating bricks were measured in the temperature range from 30°C to 760°C. Source

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