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introduction：The three simplest methods for testing lubricating oil are：Oil spot method、Color discrimination and twisting Oil spot method： Stir the oil to be tested and drizzle it onto the white paper(Preferably filter paper)，Oil stain，The oil stain passes approximately from the center outwards2～3The gradual spread of the hours，Form three concentric rings。Based on the color of these three areas、Width and shape can identify the state of the oil。 Colour discrimination： Normal colors are brown and blue-black。If it is milky yellow，It indicates that the oil is mixed with diesel or water，Should be replaced in time。If its dark black，Indicates that the oil has deteriorated，Must be replaced in time。 Twist grinding： from
2015-03-07 Reading quantity 1490
introduction：Consists of a shell and a tube bundle containing a number of pipes，cold、A heat exchanger in which heat is exchanged between hot fluids through the tube wall。Shell-and-tube heat exchanger is a traditional standard heat exchange equipment，In the chemical industry、Oil refining、Petrochemical industry、power、It is widely used in nuclear power and other industrial installations，Especially in the application of high temperature and high pressure and large heat exchangers occupy an absolute advantage。The usual working pressure can be reached4mpa，Operating temperature at200℃below，In some cases, higher pressures and temperatures can be achieved。Generally the diameter of the shell is1800sub-millimetre，Pipe length in9Below the meter,In some cases it is larger or longer
2015-03-07 Reading quantity 2821
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。]As an industrial base，It is a traditional industry，And with the economic situation cyclical change。In China，Small and medium-sized bearing manufacturers almost dominate the world，Liquidity is relatively tight，Most business owners have outdated ideas，short-sighted，At the same time, the Internet is often not very well understood，
2015-03-07 Reading quantity 1736
introduction：The automobile transmission system refers to the power transmission device between the automobile engine and the driving wheel。It guarantees the necessary traction of the car under various driving conditions、Speed of vehicle，And to ensure that the traction force and speed coordination between the change of the function，So that the power transmission can be smoothly combined or thorough according to the need、Snap apart。Make the car reverse，And left、The right drive wheel ADAPTS to differential requirements，Make the car have good power and fuel economy；The transmission system consists of a clutch、transmission、Driving shaft、Main reducer、Differential and axle。 The function of a cars drivetrain is to send the engine out
2015-03-07 Reading quantity 2821
introduction：1.3 gate(Gate) The gate is a short groove with a small cross-section area,It is used to connect the flow channel to the cavity.The area of the cross section should be small,The aim is to gain Following effect: 1.The injection is not long, Gate is cold knot. 2.Dewatering port is simple. 3.Dewatering port complete,Leaving only a few traces 4.The stuffing of multiple die holes is easier to control. 5.Reduce the phenomenon of excessive filling. 1.3.1 There is no hard and fast way to design a gate,Its mostly based on experience,But there are two basic elements that need to be compromised: 1. The area of the cross section of the gate is more
2015-03-07 Reading quantity 2823
introduction：Man-machine interface（Human-Machine Interface），Its the way humans interact with machines，The medium through which users and machines communicate information to each other，This includes the input and output of information。A good human-machine interface is beautiful and easy to understand、Simple operation and boot function，User pleasure、Heightened interest，Thus improve the efficiency of use。 The narrow man-machine interface（Human Computer Interface）It is one of the youngest branches of computer science。It is the product of the combination of the two major sciences of computer science and cognitive psychology，It relates to the present
2015-03-07 Reading quantity 2978
introduction：§1.Non-ferrous metals classification and product grade representation method one、Classification of non-ferrous metals （1）Non-ferrous pure metal Divided into heavy metals、Light metal、Precious metal、Semi-metal and rare metal five categories。 （2）Non-ferrous alloy Divided by alloy system：Heavy nonferrous metal alloys、Light nonferrous metal alloys、Precious metal alloy、Rare metal alloys, etc；According to the use of alloy can be divided：Amorphosis（Alloy for pressure processing）、Casting alloy、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 machines
2015-03-07 Reading quantity 3004
introduction：The attachment used to mount the workpiece on the lathe is a three-jaw chuck、Four jaw chuck、apex、disk、mandrel、Center frame and knife holder, etc。The main requirement for installing the workpiece is accurate position、Clamp firmly。 one、Three jaw chuck mounting workpiece The three-jaw chuck is the most widely used universal fixture on the lathe，Suitable for installation of short round bar materials or trays（Large diameter disc workpiece，It can be held with reverse three claws）workpiece，See demonstration AIDS for its structure。When turning the bevel gear，The big bevel gear turns，The flat thread on the back of it causes the three grippers to move towards and out of the center at the same time，To clamp different diameters
2015-03-07 Reading quantity 2961
introduction：rubian shiyan Creep test creep test The metal material is measured under constant temperature and constant stress for a long time，A test of the mechanical properties of a material in which slow plastic deformation occurs。The higher the temperature or the greater the stress，The more significant the creep phenomenon。Creep can occur under a single stress（tension、Pressure or torque），It can also occur under combined stress。The usual creep tests are carried out under unidirectional tensile conditions。 The creep limit is the maximum constant stress when the creep deformation or creep velocity of the sample does not exceed the specified value at a specified temperature and a specified time。There are two kinds of it
2015-03-07 Reading quantity 2849
introduction：1。The electrode should be preheated，The composition of the electrode should be the same or close to the composition of the die steel，To ensure uniform structure after welding 2。The mold should be preheated above martensitic temperature，But not too high.。 3。The current should be controlled small，Otherwise, the welding depth is too large。 4。The mold should be kept preheated during welding。 5。When necessary，Heat treatment after welding。
2015-03-07 Reading quantity 2851
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