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Low-aliquation high-speed steel roll and the preparing method

The invention discloses a low segregation centrifugal casting high speed steel roll and the method. The roll is constituted by high speed steel roll body and alloy ductile ion roll core. The roll is produced by electric furnace. The high speed steel roll body is cast on horizontal centrifuge. As the liquid steel is cast iron powder suspension concentrate with 4%-6% by weight of liquid steel is added. After the liquid steel is cast glass waste sludge is added and then it is cooled by spraying water to form the model. Meanwhile the rotate speed of casting model is changed continuously and finally the ductile ion roll core is cast at the top statically. There is no obvious element segregation in radial section of high speed steel roll manufactured in invention. The macro hardness of roll is high and can achieve 63-65HRC. The difference of roll face hardness is less than 2HRC. The hardness fall of roll along the radial direction is small. The tensile strength of roll body is more than 600MPa and the elongation of roll core is more than 3%. The service life is improved by 5-8 times than high chromium cast iron roll and is improved by 35%-48% than common high speed steel roll. It can decrease the producing cost of rolling steel and prolong roll changing period.
Owner:XI AN JIAOTONG UNIV

Cao heat engine and refrigerator

This invention provides heat engines based on various structures of internal combustion engines, such as a four-stroke piston-type combustion engine, two-stroke piston-type combustion engine, rotary combustion engine, or a free-piston type combustion engine. Said heat engine is provided with at least a heating chamber per piston or rotor, a heat exchanger unit disposed within said heating chamber through which thermal energy is extracted from a heat source and at least a port leading to a working chamber space from said heating chamber, and has a significantly increased heat transfer duration from the heat source to the working fluid within said heating chamber without increasing the number of strokes per power stroke in a cycle. Additionally, said heat engine is provided with an over expansion mechanism in conjunction with a compression means for intake charge. Thereby many of the operational characteristics of an Otto power cycle may be attained in said heat engine, and a heat source with a relatively low temperature may be accommodated through the combination of a lower compression ratio, the over expansion mechanism, and the boost of the intake charge.Another major objective of this invention is to provide a refrigerator based on the structures of the various heat engines disclosed in this invention and having a reversed operation of the heat engine. The invention combines the compression functionality of a compressor and the expansion functionality of a turbine in an air cycle machine into a single refrigerator unit having a simple mechanical structure, and provides a significantly increased heat removal rate or duration before the expansion stroke to reduce the temperature of the working fluid without increasing the number of strokes per discharge stroke of cooled working fluid in the cycle. Said refrigerator may include the over expansion mechanism or working fluid pressurization to increase the coefficient of performance and cooling load. In particular, said refrigerator uses a gas as the working fluid to avoid the negative impact of a conventional refrigerant on the environment.
Owner:CAO YIDING
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