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introduction：Metallic material、Resistance of mechanical parts and structures to high temperature fracture，Often expressed as a endurance limit。The sample is at a certain temperature and a specified duration，The stress causing the fracture is called the endurance limit。The endurance limit of metal materials is determined by high temperature endurance test。Aircraft engines and crews are typically designed to last hundreds to thousands of hours，The endurance limit of the material can be determined directly by the same time test。In boiler、In the manufacture of gas turbines and other turbine machinery，The design life of the unit is generally more than tens of thousands of hours，Their endurance limits can be linearly extrapolated from short time test data to obtain endurance limits of tens of thousands of hours or more。the
2015-03-15 Reading quantity 2775
introduction：In that wayINAbearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]How do you deal with the damage。If bearings are used correctly，Can be used until fatigue life is reached。But there will be accidental premature damage，Incapacitated for use。This early damage，Relative to fatigue life，Is a quality limit called a failure or accident。A lot of
2015-03-15 Reading quantity 1552
introduction：remoni Thermal simulation thermal analog One of the means of studying the phenomenon of heat transfer，It is mainly used to solve the heat conduction problem。Thermal conductivity and some non-thermal conductivity phenomena can be represented by the same mathematical model，Therefore, through the solution of other physical problems simulated with thermal conductivity phenomenon，The thermal conductivity problem can be solved。The most common is the simulation of thermal and electrical conductivity phenomena，Electrical simulation called heat。This method uses voltage to simulate temperature,The current simulates heat flow,Resistance simulates thermal resistance，Capacitance simulates heat capacity。The simulation method can be used to solve the problem with or without a heat source、steady
2015-03-15 Reading quantity 2777
introduction：Recycle natural gas or pure gas through a refrigerator（Like oxygen、nitrogen、hydrogen、Neon and helium, etc）Cryogenic equipment for cooling and condensing into liquid state respectively。methane、neon、Hydrogen and helium in0.1The condensation temperature at mpa pressure is:111.7K，27.1K，20.4K，4.215K。The liquefaction of gases is based on the characteristics of the gas、The condensing temperature and service requirements are achieved through the corresponding liquefaction cycle。The typical cycle is a throttling liquefaction cycle、Liquefaction cycle with expander、Gas chiller cycles and cascade refrigeration cycles（That is, multiple working fluid、Multiple stage precooling cycles）Etc.。 Gas liquefaction equipment generally includes
2015-03-15 Reading quantity 2799
introduction：There are dozens of kinds of rolling bearings on cars[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]isKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inK
2015-03-15 Reading quantity 1546
introduction： Materials are things that humans use to make things for life and production、device、component、Materials for machinery and other products，It is the material basis for human survival and development。So-called new material，Refers to those new or developing materials that have excellent properties of traditional materials。It can be seen from the history of human science and technology，The modern world has experienced two industrial revolutions led by the discovery and application of new materials。The development of the steel industry，for18The first world revolution, represented by the invention and application of the steam engine in the 21st century, laid the material foundation。Since the middle of the century，electronically，Especially microelectricity
2015-03-15 Reading quantity 2787
introduction：1.Cylindrical roller bearings[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Process of Blank forming→Deburring or banding→Soft grinding raceway surface→Soft grinding double end face→Thermal solution→Roughing the rolling surface before→Coarsely ground double ends→After coarse grinding rolling surface→End grinding double end→fine、Final grinding rolling surface→Super finishing rolling surface→cleanse、dull→Final inspection appearance
2015-03-15 Reading quantity 1549
introduction： Eccentric bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Corrosion is caused by various internal and external factors，In summary, there are mainly：1、Metal surface finish(Oxygen concentration difference battery corrosion)。 2、Chemical composition and structure of metal material itself。3、Composition of solution in contact with metal surface andpHvalue；4、environment
2015-03-15 Reading quantity 1534
introduction：General seal damage causes，It is also almost the working requirements for seals： 1.indurate(aging) - One of the reasons for the leakage of seals is that the material itself is hardened by temperature，When the hardness is too high，The seal cannot fill the gap between it and the mating part，It will create a leak。 2.wear - Wear of seals relates to the surface finish of mating parts、Motion speed and transmission media, etc，Different sealing materials adapt to different speed of movement。 3.Squeeze out - When the seal is subjected to excessive pressure, it will be squeezed into the metal gap，Damage to the seal resulting in leakage，This feeling
2015-03-15 Reading quantity 1430
introduction： Lubricating pairKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inKOYOBearing in the processing process，The outer ring of the bearing、Inner ring、How do the roller and cage fit together。]，Especially the fatigue life and friction of rolling bearings、wear、Temperature rise、Vibration and so on have important effects。There is no normal lubrication，The bearings dont work。Bearing loss
2015-03-15 Reading quantity 1437
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