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introduction： The solidification speed of liquid die forging is fast，Therefore, the micro-segregation is lighter than other casting methods。however，The parts with deeper dents are in liquid die forging，It is easy to produce a unique macroscopic segregation - extrusion segregation。figure7-2It is used to explain the formation mechanism of extrusion segregation。Liquid metal after pouring the mold，First nucleation occurs at the mold wall，Grow up，encrusted。As the solidified layer continues to advance through the mold wall，The solute elements in the adjacent liquid phase are more and more enriched，Once the mold is pressed，This liquid will be pushed to the edges of the part。The solute element content in the segregation site is high，There are also many low-melting phases。Liquid die from steel flat flange
2015-01-09 Reading quantity 2922
introduction： Adiabatic compression﹑Isobaric heating﹑Adiabatic expansion and isobaric cooling 4The process consists of a gas turbine thermodynamic cycle。There have also been gas turbines with constant volume heating cycles﹐But it is not widely used。 Cyclic process figure1 Gas turbine simple cycle(Open type) Simple cycle for gas turbine。The gas turbine draws air from the atmosphere﹐In the compressor(compressors)Intermediate compression。The compressed gas enters the gas turbine combustor﹐Fuel is added here for combustion heating。The heated high-temperature gas enters the gas turbine(Hereinafter referred to as turbine)Work by expansion。The expanded gas is discharged into the atmosphere。turbine
2015-01-09 Reading quantity 2915
introduction：1）、Reducer heat and oil leakage： Worm gear reducer to lift rate，Generally, non-ferrous metal is used as worm gear，The worm is made of harder steel，Because it is sliding friction drive，During operation，It generates a higher amount of heat，The thermal expansion of the reducer parts and seals is different，Thus, gaps are generated on the mating surfaces，The oil becomes thinner as the temperature increases，Easy to leak。There are four main reasons，One is whether the material collocation is reasonable，The second is the surface quality of the meshing friction surface，The third is the choice of lubricating oil，Whether the amount added is correct，The fourth is the assembly quality and the use environment。 2
2015-01-09 Reading quantity 2920
introduction： Pressure filtration or vacuum evaporation－Filter unit for removing solid impurities and moisture from impure oil by pressurized filtration method。The oil filter is mainly used to improve the insulation performance of electrical oil and the purity of lubricating oil。Oil filter is divided into ordinary oil filter and vacuum oil filter two kinds。 Ordinary oil filter By the initial filter﹑Oil pump and filter device。The primary filter is a cylindrical metal mesh﹐Prevent large solid particles in the impure oil from entering the pump。The oil pump is usually a gear pump﹐Feed the impure oil into the filter。The filter device is a small hand-pressed plate and frame filter press﹐Use special filter paper as filter medium。Dont
2015-01-09 Reading quantity 2818
introduction：Applicable model： 1、Open single column reset table press：J11-16，J11-50（K115），TK115，K116Б，K117，K117A，K117Б，J11-100，231817，KБ105。 2、Open double column fixed table press：J21-40，Tool handling60T，J21-63，JB21-50。 3、Open double column inclinable press：J23-10（K231），231811，J23-16，J23-16A（K232Б），JB23-63，J
2015-01-09 Reading quantity 2819
introduction：Application of AC technology in electric forklift l、The conversion between high and low voltage is simple。 2、The motor becomes strong，And can withstand the impact of high current。 3、The number of motor parts is greatly reduced，And wear free，Strong and durable。 however，The application of AC motors in battery-powered equipment such as forklifts has certain limitations，There are two main reasons：80VLow system voltage，The conversion of direct flow AC by high energy semiconductor is required，This cost is at the bottom of the list；The conversion process itself consumes energy，electricity
2015-01-09 Reading quantity 2896
introduction： To judge the disassembledFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]Whether it can be used again，Check the bearing after washing。Carefully check the raceway surface、Rolling surface、State of mating surface、The wear condition of the cage、FAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball shaft consisting of a cage assembly with a solid window cage
2015-01-09 Reading quantity 1558
introduction：Shangyin guide rail sales are the highest in the market，Because its affordable，Excellent quality。In the inlet guide rail，The cost performance is very high。Silver guide rails are used for drilling machines，Work more efficiently。
2015-01-09 Reading quantity 25986
introduction： Working principle This machine adopts vacuum feeding method，Continuous container rotation，The material is thoroughly mixed inside。Local buttonGMPRequirement design，secure、。 Scope of application medicine、Chemical engineering、food、Metallurgy and other industries for the mixing of powder and granular materials。 Technical parameter specification/item Gross volume Working volume Material deposit
2015-01-09 Reading quantity 2917
introduction：The sun shines on the semiconductorp-nknot，Forming new holes-Electron pair，inp-nUnder the action of junction electric field，Hole supplynRegional flow directionparea，Electron distributionpRegional flow directionnarea，When the circuit is switched on, an electric current is formed。This is how photoelectric effect solar cells work。 one、Solar power generation There are two kinds of solar power generation，One is light—hot—Electrical conversion mode，The other is light—Electric direct conversion mode。 （1）light—hot—The electric conversion method uses the heat generated by solar radiation to generate electricity，Generally, the heat energy absorbed by the solar collector is converted into steam of the working medium，And then drive the steam turbine to generate electricity。
2015-01-09 Reading quantity 2921
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