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introduction：The characteristics of ultraviolet-visible spectrophotometry are described in this paper、Principle and application，Several examples are given to illustrate the application of UV-VIS spectrophotometry in various fields。 Keywords organic analysis absorption spectroscopy UV-VIS spectrophotometry 1.summarize In practice, people have long concluded that substances of different colors have different physical and chemical properties
2015-01-28 Reading quantity 2835
introduction： The steel is heated in air or immersed directly in a concentrated oxidizing solution﹐A material protection technique that produces an extremely thin oxide film on its surface﹐Also known as blackening。Bluing of steel parts can be carried out in molten salts of sodium nitrite and sodium nitrate﹐Can also be in high temperature hot air and500℃The above is carried out in superheated steam﹐It is more commonly heated in concentrated caustic soda with sodium nitrite。The composition of the solution when blue﹑The reaction temperature and time depend on the composition of the steel matrix。The bluing film is composed of magnetic iron oxide﹐The thickness is...0.5～1.5micron﹐Color with material composition and process strip
2015-01-28 Reading quantity 2865
introduction：1、work a The workpiece is the punch of each process specified in the process document。 2、Process part A process piece is a blank or punch that has been stamped，But further stamping is needed。 3、Up. a The upper part is to feed the process part into the mold for further stamping。 4、Loading device The upper part device is the device that sends the working part into the mold。 5、Upper pole The upper pole is the upper end of the up and down movement of the press slider。 6、Lower pole The lower pole is the lower end of the up and down movement of the press slider。 7、 thorn Burrs are blanked after cutting
2015-01-28 Reading quantity 2847
introduction： Working principle A fan with a dispersing effect，Especially suitable for air drying of thermal sensitive materials。High speed spinning fan impeller，Can get wet、Even the caked material is crushed、Till dispersed、Stir at the same time during dispersion、Mix and then the material and heat flow parallel。This type of device，Adapted to dry cake caking，Materials also belonging to surface moisture，Moisture content≤40%，If the processing volume is large or the finished product requires drying to the content15%The following，Secondary air drying can be used。When the material moisture content exceeds40%，but≤60%when，Difficult to feed，A mixer should be used，advance
2015-01-28 Reading quantity 2844
introduction：Gear reducer is a transmission equipment，The longer it works, it will increase the wear of its internal transmission。So from what aspects should be analyzed gear reducer internal transmission device wear problems？A gear device in a gear reducer（Gear frame and reducer）The losses include the following three aspects： 1、Loss of sliding friction between teeth。 2、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，Bring down
2015-01-28 Reading quantity 2828
introduction： Main channel、The function of the diverter and gate is to transport the plastic melt from the injection molding machine nozzle to the cavity。The aggregate of the pouring system can be crushed and reused，This is true，But nonetheless，Because the presence of condensate means that the injection molding machine productivity is reduced，Because the material part of the pouring system must also be plasticized in the barrel of the injection molding machine。In the case of smaller plastic parts，The aggregate of the pouring system may account for the actual injection volume50Or more。 Main channel The main stream can be seen as a continuation of the nozzle channel in the mold。In a single cavity mold，The main runner runs directly
2015-01-28 Reading quantity 2808
introduction：After a period of exercise，Vibration and noise maintain a certain level，Very homogeneous spectrum，Only one、Double frequency。Frequency spectrum above triple power frequency rarely occurs，Thrust aligning 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。]Very stable，Enter the stable working period。 Continue to run and enter the late use，Bearing vibration and noise open
2015-01-28 Reading quantity 1618
introduction：71：What are the bending forming methods commonly used by riveters？ a：With cold bending、Hot bending、Hand bending、Mechanical bending。 72：What are the several forms of material bending deformation when pressing and bending？ a；Free bending、Contact bending、Corrected bending。 73：What is related to the change in the shape of the cross section of the material during bending？ a：And relative bending radius、Geometric characteristics of cross section、Bending mode dependent。 74：What is the method to prevent billet deflection during bending？ a：A supporting device and a positioning hole are provided。 75：Roll bending machine includes which
2015-01-28 Reading quantity 2911
introduction：Powder metallurgy 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。] Porous metal plain bearings made of powder metallurgy materials。An appropriate amount of molybdenum disulfide was added to the porous metal material﹑graphite﹑Solid lubricants such as teflon﹐Can be self-lubricating bearings。Dip the bearing in oil﹐Fill the pores with lubricating oil﹐It becomes an oil bearing。
2015-01-28 Reading quantity 2839
introduction：There are four main types of reducer according to structure classification： 1.Worm gear reducer； 2.Harmonic reducer； 3.Gear reducer； 4.Planetary reducer； The following is a very simple overview of the precision planetary reducer： There are two main types according to the output direction：Straight and right Angle； There are generally three kinds of progression：First stage reduction（Generally less than10：1）、Secondary reduction（Generally greater than10：1Less than or equal to200：1）、Three-stage reduction（Some brands dont have a third level，Maximum deceleration ratio achieved100：1，The general division principle is greater than100：1），but
2015-01-28 Reading quantity 2863
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