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introduction：So-called rolling 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。]play，That is, when the rolling bearing is not installed on the shaft or the rolling bearing box，Fasten one of its inner or outer rings，Then make the unfixed side the amount of movement when moving radial or axial。By direction of movement，It can be divided into radial clearance and axial clearance。 Clearance during operation（
2015-02-11 Reading quantity 1447
introduction：PTHThe hole is broken（colloquially：Keep a mistress） Etched slope fracture overerosion Glass fiber pulling Drill a needle to cut through the wall The roughness of the hole wall causes the hole to break
2015-02-11 Reading quantity 2801
introduction：1、What is a frequency converter？ The frequency converter is a power supply(50Hzor60Hz)Convert to AC power of various frequencies，A device to achieve variable speed operation of a motor，The control circuit controls the main circuit，A rectifier circuit converts alternating current into direct current，The DC intermediate circuit smooths the output of the rectifier circuit，The inverter circuit converts direct current into alternating current。For inverters that require a lot of computation, such as vector control inverters，Sometimes you need one to do torque calculationsCPUAnd some corresponding circuits。Variable frequency speed regulation is by changing the frequency of the motor stator winding power supply
2015-02-11 Reading quantity 2903
introduction：1，Inputs are generally not perfect，Broken face。Will cause difficulty in drawing。Solution Dont saveIGESformat，Read directly in rags format。 2，A reference point shall be fixed when drawing a project drawing，Adequate scale。Dimension lines do not intersect，Have a sense of direction，Go left, go left，Down and down。Unless its not clear，Cant be flagged in considering other directions。The maximum size should be marked in the main view，Sectioned views are used to mark invisible dimensions，The miscellany is unclear。For the mold，I like to put the size all together，Dont like to look for it。Lathe workers do not need full section marking，Like paragraph by paragraph mark。Pair spark
2015-02-11 Reading quantity 2788
introduction：As an essential transmission equipment in modern construction，Harbin reducer、Planetary reducer、Hard gear reducer、Gear reducer and other reducer products are used in various industries。With the development of economy and the improvement of scientific and technological level，Chinas reducer industry has formed a certain industrial scale，At present，Chinas reducer products not only meet the needs of the domestic mainstream market，Also exported abroad，And occupy a certain position in the international market。 At present，Our country is in a period of transformation of economic and social development。Since the reform and opening up，Chinas economic development has taken off，Every industry whether in the industry of development
2015-02-11 Reading quantity 2797
introduction：In general，TIMKENbearing[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。]The amount of grease filled in，Always in excess of the actual requirements directly involved in lubrication，In the cavity of the holder and bearing cover，And form an outline around the roll。In the process，Due to the resistance of excess grease，The bearing temperature rises quickly
2015-02-11 Reading quantity 1553
introduction：In heat treatment，Improving the quality of spheroidizing annealing，fineness、evenness、Progress has been made in the research of spherical carbides and the reduction of annealing time or the cancellation of the spheroidizing annealing process，That is, the production of wire rod adopts two tissue annealing，Will be pulled after720℃~730℃Recrystallization annealing changed to760℃Tissue annealing。This allows for low hardness、spheroidization、The tissue without the network carbide，The key is to ensure the intermediate drawing surface reduction rate≥14％。The process improves the efficiency of heat treatment furnace25％~30％。Continuous spheroidizing annealing heat treatment technology is bearing[bearing:bearing（“Bearing”，Japanese
2015-02-11 Reading quantity 1459
introduction：Plastics play an important role in the manufacture of car engines。From the air intake system to the cooling system，And then to the actual launch，Plastics make engine systems easier to design，Easier to assemble，Lighter weight。 Intake system The quality and quantity of air mixed with the fuel is critical。Will affect the determination of engine life，And the running horsepower and stability of the engine。Since numerous impurities may enter the engine through the air，Deposits on sophisticated engine components and degrades engine performance，Examples include blocking spark plugs to prevent ignition and blocking various intake lines，Affect the switch of cylinder valve, etc。
2015-02-11 Reading quantity 2886
introduction：fenmo yejin gaosugang Powder metallurgy high speed steel powder metallurgy high speed steel Powder metallurgy method is used（The atomized powder is treated by isostatic pressing in hot state）A dense billet is produced，reforge、High speed steel profiles obtained by isothermal deformation in rolling,Powder high-speed steel for short。Powder high speed steel has uniform structure,Fine grain,The segregation which is difficult to avoid in fusible casting high-speed steel is eliminated,Therefore, it has higher toughness and wear resistance than the fusible cast high-speed steel with the same composition，At the same time, the heat treatment deformation is small、Forge rolling
2015-02-11 Reading quantity 2785
introduction：Abstract：Drinking water purification technology and engineering facilities，It emerged and developed from the long struggle between human beings and water pollution and the diseases caused by it。 keyword：Drinking water water treatment technology Deep treatment technology 1introduction Drinking water purification technology and engineering facilities，It emerged and developed from the long struggle between human beings and water pollution and the diseases caused by it。 19century，Some countries in Europe and the United States due to discharge of sewage、Feces and garbage etc. make the surface and groundwater
2015-02-11 Reading quantity 2876
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