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introduction： 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﹑The forging performance and grinding performance are good。The content of carbide in powder high speed steel greatly exceeds the casting speed
2015-02-18 Reading quantity 2781
introduction： USBThe advantage of General users and system integrators can use theUSBPower-on function,Activate the operating system,Not only fromUSBInterface boot,More customizableUSBInstructions at boot time,Under previous circumstances,Generally speaking, the boot command to activate the operating system is mostly from the floppy disk drive,Optical drive or hard disk,But nowUSBThe device can also search for the power-on command,Such as,USBThe powered device can be installed in the first position of the system,It is also suitable for troubleshooting or the absence of a traditional boot environment, Learn aboutUSBThe convenience with
2015-02-18 Reading quantity 2797
introduction：A flat connecting rod mechanism that uses a crank and a slider to rotate and move each other，Also known as crank linkage mechanism。In the crank slider mechanism, the member constituting the moving pair with the frame is a slider，Through turning pairA、BThe member connecting the crank and the slider is a connecting rod（figure1 [Crank slider mechanism schematic]）。When the mechanism moves，Hinge center BThe trajectory of the crank does not pass through the center of rotationO，It is called an offset crank slider mechanism(figure1a[Crank slider mechanism schematic])，Where is the offset。Such as taking different components for the frame,A rotating guide bar mechanism can also be obtained（figure1b[Crank slider mechanism schematic]）、Crank block mechanism（figure1
2015-02-18 Reading quantity 2795
introduction： Serial number Variety name And standard number Specification range Product grade Thread tolerance machine
2015-02-18 Reading quantity 2911
introduction：Surface fatigue wear Due to cyclic contact stress﹐A wear in which cracks form and spread inside the working surface or surface of the friction pair, causing the surface material to peel off。Contact sports include rolling﹑Slide or scroll plus slide 3Such situation。Surface fatigue wear often occurs in rolling 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。]﹑Gear and steel
2015-02-18 Reading quantity 2787
introduction： one、The characteristics of mining machinery are：Mines are usually divided into underground mining and open pit mining。 1）Because mine space is limited，The mechanism of mining machinery is required to be compact，Small size，Radial 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 pressure and load on the gears are large； 2）Mining machinery to be able to
2015-02-18 Reading quantity 2794
introduction： SKFImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]（Especially rolling bearings）There are two kinds of structures: strip cage and no cage。Medium largeSKFImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，
2015-02-17 Reading quantity 1444
introduction： A special machining that combines electrolysis with mechanical grinding﹐Also known as electrochemical grinding﹐English abbreviationECG。Electrolytic grinding yes20century50It was invented by Americans in the early 1900s。figure The picture shows the principle of electrolytic grinding。The workpiece is connected to the positive electrode of the DC power supply as an anode﹔The conductive grinding wheel is connected to the negative electrode of the DC power supply as the cathode。When grinding﹐Maintain a certain grinding pressure between the two﹐The non-conductive abrasives protruding from the surface of the grinding wheel make the workpiece surface conductive to the substrate of the grinding wheel
2015-02-17 Reading quantity 2785
introduction： Fuel atomization in diesel injection system﹐And distributed in the combustion chamber to mix with air components。It is mainly composed of an oil injector and an oil injector body。Its installation position and Angle on the cylinder head depend on the design of the combustion chamber。The spray characteristics of the injector include atomization particle size﹑Oil mist distribution﹑Beam direction﹑Range and diffusion cone Angle, etc。These characteristics should meet the requirements of diesel engine combustion system﹐To perfect the mixture formation and combustion﹐And obtain higher power and thermal efficiency。Fuel injectors are divided into two types: open and closed。The structure of the open injector is simple﹐But poor atomization﹐Rarely adopted。Closed fuel injectors are widely used in various diesel engines
2015-02-17 Reading quantity 2790
introduction： PLC （1）From switching quantity control to sequence control、Shipping processing，Its from the bottom up。 （2）continuousPIDControl and other functions，PIDIn the interrupt station。 （3）One availablePCMachine master station，Multiple sets of the same typePLCAs slave station。 （4）Also onePLCMaster station，Multiple sets of the same typePLCAs slave station，constitutePLCnetwork。This is better than...PCThe convenience of being a master station is：When there is user programming，You dont have to know the communication protocol，Just follow the instructions。 （5）PLCThe grid can be either independentDCS，Can also be used asD
2015-02-17 Reading quantity 2869
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