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introduction：——Refers to the degree of difficulty of casting and forming metal materials。Evaluation index：Fluidity and contractility。one、mobility——It means that molten metal has the ability to flow1、Length of spiral specimenL，Such asLCast steel=20mm，LCast iron=1800mm，Cast iron has better fluidity than cast steel。2、Factors affecting liquidity1）Chemical composition：Eutectic alloys are best，Pure metal difference；2）Pouring temperature：TPour higher，The longer the holding time，The better the liquidity，But the shrinkage is large and the casting is ruined。EXP：“Hot oven，Low temperature casting”。3）The type of mold affects the heat storage capacity and air permeability of the mold；Such as:Dry sand mold&
2015-02-03 Reading quantity 2865
introduction： Special processing methods that use the principle of electrolytic deposition of metals to accurately replicate some complex or special shaped workpieces。It is a special application of electroplating。Electroforming is a Russian scholar Ｂ.Ｃ.Jacobi1837invented。Originally it was mainly used to reproduce metal artwork and printed editions﹐19At the end of the century, it was used to make record molds﹐In the future, the scope of application will gradually expand。 figure The schematic diagram is the basic principle of electroforming。The cathode is made of a mould pre-made to the desired shape﹐Electroforming material
2015-02-03 Reading quantity 2813
introduction：PLCThe user program is designed according to the process control requirements of the control system，passPLCProgramming language design。According to the International Electrotechnical Commission developed industrial control programming language standards（IEC1131-3）。PLCThe following five programming languages are included：Ladder diagram language（LD）、Instruction list language（IL）、Function module diagram language（FBD）、Sequential function flowchart language（SFC）And structured text language（ST）。 1、Ladder diagram language（LD） Ladder diagram language isPLCThe most commonly used programming language in programming。It is with relays
2015-02-03 Reading quantity 2927
introduction： With the advancement of technology，At present, many cotton mills use autolevellers to replace the originalA076A type of coiler iron gun device。It is not only simple to drive，Moreover, the positive winding rate is obviously higher than that of the iron gun device，It has been recognized and praised by more cotton mills。But also due to improper debugging methods and other reasons，Insufficient knowledge of the procedure，Cant play its role well。For this purpose，It is now produced by Wuxi PrattZNC-800For example, a series of frequency converter autoleveler，Introduce the experience of using our company。 The variable frequency autoleveller is mainly composed of high precision displacement sensor、Levelling controller、Frequency changer、A speed reducer with a common motor
2015-02-03 Reading quantity 2916
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。]High temperature will cause great harm to the machine during rotation，Therefore, the temperature in the use environment is controlled as far as possible100Degree or below, There may be reasons for the high temperature of aligning ball bearings： 1.Lubricating oil is insufficient or mixed with impurities 2.The mounting of bearings is not
2015-02-03 Reading quantity 1561
introduction：The injection molding machine is arranged according to the injection device and the mold locking device，Divided into vertical、Horizontal type and vertical type。Their respective characteristics are as follows。 Characteristics of vertical injection molding machine １．The injection device and the clamping device are located on the same vertical center line，And the mold is opened and closed in an up and down direction。Its floor space is only about half that of the horizontal machine，therefore，Converted into an area of production is about twice。 ２．Easy to achieve insert molding。Because the die faces up，Insert placement is easy。Use the following template to fix、The upper template can be moved，drawstring
2015-02-03 Reading quantity 2810
introduction： 10.The forging flow line is not well distributed The uneven flow line distribution of forging means that the flow line is cut off at low times of forging、reflux、Eddy current and other flow line disturbances。If the mold design is not appropriate or the forging method is not reasonable，Prefabricated blank flow line disorder；Uneven flow of metal caused by improper operation of workers and wear of molds，Can make the forging flow line distribution is not good。The mechanical properties will be reduced if the flow line is not smooth，So for important forgings，Both have requirements for streamline distribution。 11.Cast tissue residue The casting tissue residue mainly appears in the forgings using ingot as blank。
2015-02-03 Reading quantity 2826
introduction：IKOAfter bearing installation，To check that the installation is correct，An operational check is required。Small machines can be turned by hand，To make sure the rotation is smooth。Check items for foreign bodies、scar、Poor operation due to indentation，Due to poor installation，The torque caused by poor machining of the mounting seat is unstable，Because the clearance is too small、Installation error、Seal friction caused by excessive torque and so on。Power operation can begin if there is no anomaly。 Power operation，Start at low speed with no load，Slowly raise to rated operation under specified conditions。The inspection items in the test run are，If there is any unusual sound、Flanged bearing[bearing:bearing（“B
2015-02-02 Reading quantity 1575
introduction：1．According to theNSKbearing[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。]Structural type classification (1) NSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD
2015-02-02 Reading quantity 1444
introduction：Industrial furnace preheater A device for heating combustion-supporting air and gas fuel by the waste heat of flue gas discharged from an industrial furnace。After the preheater is installed on the industrial furnace﹐Because of the heat recovery﹐It can save fuel and easily increase the furnace temperature to speed up the heating rate。 Forging furnace must be guaranteed1250℃Above the furnace temperature。The furnace operates at a lower calorific value 1300Kilojoule (kJ)/meter3The gas or calorific value is lower5000Kilojoule (kJ)/Kilo of coal for fuel﹐It will be difficult or even impossible to reach the required furnace temperature﹐At this time, the gas and air can be preheated。Such as﹕The calorific value of gas is1200Kilojoule (kJ)/meter3﹐Can only reach about1
2015-02-02 Reading quantity 2802
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