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introduction：The basic mechanism of extrusion is simple--A screw turns in the cylinder and pushes the plastic forward。The screw is actually a ramp or slope，Wrap around the center layer。The purpose is to increase the pressure in order to overcome greater resistance。In terms of an extruder，There are3A resistance needs to be overcome：Solid particle（feed）The friction on the cylinder wall and the first few turns of the screw（Feed area）The friction between them；The adhesion of melt on the cylinder wall；The resistance of the flow within the melt when it is pushed forward。 Newton once explained，If an object is not moving in a given direction，So the force on this object is
2015-04-06 Reading quantity 2792
introduction：Double row tapered roller 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。]Many structures，The largest number is35000type，There is one double raceway outer ring and two inner rings，There is a gap between the two inner rings，The clearance can be adjusted by changing the thickness of the spacer。This type of bearing can withstand two-way axial loads while bearing radial loads，Axial clearance in the bearing is available
2015-04-06 Reading quantity 1551
introduction： A length measuring tool that uses the photoelectric principle to aim the line pattern of the line gauge。The photoelectric microscope is mainly used for the verification and engraving of high precision linear scale，It is also used for coordinate positioning of precision machine tools。It is developed in order to solve the problem of low accuracy of reading microscope and can not be automatically aimed。to20century40Late epoch，Aiming accuracy achieved±0.05Micrometer above。Photoelectric microscopes are divided into oscillator type and differential photometric type。 There are two kinds of vibro-type photoelectric microscope: transmission type and reflection type。The transmission type is used for glass wire rule,Reflective type for metal wire gauge。figure1[The oscillator is inverted
2015-04-06 Reading quantity 2778
introduction： A sensor with a standard signal output。The term is sometimes used with sensors。
2015-04-06 Reading quantity 2801
introduction： Mechanical transmission that uses the meshing of screw and nut to transmit power and movement。It is mainly used to convert rotational motion into linear motion﹐Convert torque into thrust。By job characteristics﹐The spiral used for screw transmission is divided into force transmission spiral﹑Conduction screw and adjusting screw。(1)Force transfer screw﹕To transfer power﹐It uses a smaller torque to produce a larger axial thrust﹐Generally for intermittent work﹐The working speed is not high﹐And it usually requires self-locking﹐Examples include the screw on screw presses and screw jacks(figure1 Screw jack )。(2)Conduction screw﹕Transfer movement is the main﹐High motion accuracy is often required﹐normal
2015-04-06 Reading quantity 2807
introduction：1,Its used in carsKOYObearing[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。]Grease is mostly used for chassis，In particular, the amount of wheel hub bearing is larger，The amount of grease used in other parts is less。 2.The wheels of ordinary vehiclesKOYObearing[KOYObearing:kOYOBearing general
2015-04-06 Reading quantity 1564
introduction： Standard number Standard Chinese name Standard English name GB/T2816-2002 Submersible pump for well Submersible pumps for deep well JB/T1
2015-04-06 Reading quantity 2929
introduction：The stainless steel can be heated by electric furnace before forging，You can also use a flame stove。Many flame furnaces are used in production，Because of its lower cost。The furnace gas atmosphere should be neutral or slightly oxidizing。For austenitic stainless steel，A reducing atmosphere cannot be used，To avoid carburization or chromium depletion，The intergranular corrosion resistance is reduced；For martensitic stainless steel，Because of the high carbon content，Do not use excessive oxidation atmosphere，To avoid serious decarbonization。 When heated in a flame furnace，It should also be noted that the gas should remain essentially free of hydrogen sulfide and other sulfur-containing pollutants，Especially for high nickel steel，And you cant use fuels with high sulfur content，Because sulfur seeps into steel and forms with nickelNiS
2015-04-06 Reading quantity 1663
introduction：work can Instructions Scope of application Basic condition To prepare note Pocket finishing Pocket Remove materials from enclosed areas 2DRough processing into the child point Or underside finishing 2DClosed profile Kalgar island Can be cut in layers Screw feed Contour machining Profile Cut along the contour boundary 2DPeripheral OR Finishing the edge of the hole Open or closed profile Multiple knives need to increase the width of the material
2015-04-06 Reading quantity 2996
introduction： Serial number Variety name And standard number type Specification range Product grade Thread tolerance Mechanical property Surface treatment 1
2015-04-06 Reading quantity 2969
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