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introduction： 1．summarize Aluminum alloy parts metal mold casting method due to its high productivity、Clean working environment、The castings have the advantages of smooth surface and dense internal structure and are widely used。Especially car engine parts，day、beauty、The British、Many industrial developed countries such as Germany and Italy use metal gravity casting method to produce automobile engine aluminum cylinder block、Aluminum cylinder head and aluminum piston。In recent years，Many manufacturers in China have also introduced advanced metal type equipment or homemade equipment to produce automobile engine cylinder heads、Aluminum castings such as intake pipes and pistons。Metal casting aluminum technology is also widely used in aviation、spaceflight、High voltage electrical apparatus、Electrical machinery and
2015-04-17 Reading quantity 2800
introduction：1 Contact fatigue failure Contact fatigue failure meansNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]The working surface is subjected to alternating stress and produces failure。Contact fatigue spalling
2015-04-16 Reading quantity 1461
introduction：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。]If the workpiece surface quality is poor，The corrosion resistance of the workpiece will be reduced。whenTIMKENThe bearing workpiece will produce grain when it is seriously overheated，And theyre all pretty thick，It will also make steel8The iron cable volume is increased，It is easy to cause the deterioration of hot working performance of bearing workpiece。lc
2015-04-16 Reading quantity 1469
introduction： 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。]Dimensional accuracy and rotation accuracy are based onISOandJISStandard。For machines requiring high precision and high speed operation，Recommended use5Bearings of class or above accuracy，Deep groove ball bearing、Radial thrust ball bearings or cylindrical roller bearings
2015-04-16 Reading quantity 1471
introduction：Specialized grinding machines for grinding ingot and billet surfaces。The purpose of grinding is to remove surface defects such as decarburized layers of ingot and billet、Scale oxide、Folding and cracking, etc，To avoid further rolling or forging defects expansion and waste of material。The billet grinding used to be mainly a suspended grinder，Manual operation。1950A billet grinder appeared later in the year,But its growing fast.，to70age,The billet grinder has the following features：High grinding wheel speed(da80～90meter／points)，Grinding pressure is high(Usually thousands of newtons，Maximum accessibility3.5×10(Newton)，High motor power（da600kilowatt）,Metal removal
2015-04-16 Reading quantity 2809
introduction：Forging production is metallurgy（Raw material）Intermediate process between final heat treatment，Therefore, the quality of the forging has a great impact on the quality of the final heat treatment and the performance of the parts。 Normal forging structure after a reasonable final heat treatment，The desired organization and performance can be obtained。however，Some defects in the structure caused by improper forging process or some defects left over from raw materials，It has great influence on the quality of forgings after heat treatment。Examples are given below： 1Defects in the structure of some forgings，It can be improved during heat treatment after forging，Satisfactory microstructure and properties can still be obtained after final heat treatment。Such as
2015-04-16 Reading quantity 1562
introduction： Turntable 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。]It is able to withstand a large axial load at the same time、Combined load such as radial load and overturning moment，Set support、rotate、drive、Fixed and other functions in one special structure of large bearings。therefore，Be sure to do a good job of correlation inspection when installing turntable bearings，or
2015-04-16 Reading quantity 1536
introduction： Utility boiler@﹑Industrial furnace or other power﹑metallurgy﹑Heat exchangers that exhaust smoke heat from chemical and other devices to preheat combustion air。Its function is﹕ Reduce the exhaust temperature of boilers and other equipment﹐Improve thermal efficiency﹔ Raise the temperature of the air used for combustion﹐Make the fuel easy to catch fire﹑Combustion stability and improved combustion efficiency。 The air preheater mainly has tube type according to different structure﹑Plate and rotary3class(See table Types and main characteristics of air preheater )。In the vertical tubular air preheater(figure1 Vertical tubular air preheater )In the﹐Smoke generally passes through the pipe from top to bottom﹐Connect heat
2015-04-16 Reading quantity 2791
introduction：1.The reducer refers to an independent closed transmission device between the prime mover and the working machine。In addition，The reducer is also a power transmission mechanism，Speed converters using gears，Slow down the rotation of the motor to the desired number of revolutions，And get a larger torque mechanism。Reduce speed and increase output torque，Torque output ratio By motor output multiplied by deceleration ratio，But be careful not to exceed the rated torque of the reducer。 2.The function of the reducer is to slow down and increase the torque，This function is entirely dependent on gears and gears The meshing between them is complete，Easier to understand。 two、Types and applications of commonly used reducers
2015-04-16 Reading quantity 2789
introduction： Polished rod-Ball 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。]The structure of the transmission mechanism is very simple，Only by the light rod、The nut seat is composed of four centripetal ball bearings that are tilted left and right respectively(See picture2As indicated)。The accuracy grade of ball bearings is only ordinary grade；The aperture of the inner ring needs to be ground into two symmetrical cones，Conical busbar and
2015-04-16 Reading quantity 1577
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