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introduction： 1)One slow, two fast, three steady。At the beginning of pouring，Especially when the liquid metal is just touching the foam，A large amount of gas produced by the gasification of the pattern material，When the straight gate is not filled or the static pressure of the metal liquid at the beginning of pouring is less than the gas pressure of the polystyrene decomposition product，Pouring too fast is easy to produce choking phenomenon，Make liquid metal splash。To avoid this phenomenon，At the beginning of pouring, the method of slow pouring can be adopted，After the pouring system is filled with liquid metal，Can increase the pouring speed，The sooner, the better，However, the rule is that the sprue cup is filled with metal and does not spill。In the late stage of pouring，When the liquid metal reaches its shape
2015-02-20 Reading quantity 2790
introduction： Transport vehicles for short distance transportation of trackless trains。Tractors and trailers belonging to handling vehicles do not include cars driving on the road、Tractors and trailers。A tractor is used to tow a trailer，It is sometimes used to pull other equipment，Towing aircraft or air cushion handling devices, etc。The trackless train evolved from the narrow-gauge rolling stock，Its transport routes can be changed，It has greater flexibility，And has been developed into a driverless handling system。The structure will be complex in the transport vehicle、The driving part with high cost and the bearing part with simple structure are made into tractor and trailer respectively，And form a train to run，Can improve drive part turnover
2015-02-20 Reading quantity 2792
introduction：The raceway sound is due toinabearing[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。]When rotating, the rolling element rolls in the raceway and generates a smooth and continuous noise，It attracts attention only when its sound pressure level or tone is extremely high。In fact, the sound energy stimulated by raceway sound is limited，As in normal circumstances，High quality aligning ball bearing track sound
2015-02-20 Reading quantity 1539
introduction： Fengye Mall clutch introduces you to ball screw testing and maintenance。 When the CNC machine has a large reverse error、Positioning accuracy is unstable、When theres a knife mark across the quadrant，First check the lead screw system for gaps。The detection methods are:Place the dial indicator with the steel ball in the center hole of one end of the lead screw In the，Measure the axial movement of the lead screw，Another dial gauge measures table movement。Turn the lead screw forward and backward，Observe the values reflected on the two dial gauges，Determine the fault location according to the different value changes。 For example, when the dial indicator measuring the lead screw rotates positively and negatively, the pointer does not
2015-02-20 Reading quantity 2798
introduction：Cycloidal pin gear reducer adopts cycloidal pin tooth meshing、Principle of planetary transmission，So its usually called a planetary cycloidal reducer，Planetary cycloidal pinwheel reducer can be widely used in oil、Environmental protection、Chemical engineering、cement、transport、spin、pharmacy、food、printing、hoisting、mine、metallurgy、unit、Power generation and other industries，As a driving or decelerating device。Its unique smooth structure can replace ordinary cylindrical gear reducer and worm gear reducer in many cases，therefore，Planetary cycloidal pin gear reducer is widely used in various industries and fields，It is generally welcomed by the majority of users。
2015-02-20 Reading quantity 2881
introduction： Electric spindle 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 sound of the raceway is running，A continuous sound made by its rolling element rolling on the raceway surface，Generally speaking, it is the characteristic sound that occurs in all electric spindle bearings。The general bearing sound is the raceway sound plus other sounds。 The track sound of ball bearings is irregular，
2015-02-20 Reading quantity 1537
introduction：Peking130The engine crankshaft rear end of the car transmission——Shaft guide 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。]Disassembly method after damage：This bearing is6203D ball bearing，First remove the transmission，Clutch and flywheel，Then use the screwdriver to pick out the rubber oil seal；If its an iron oil seal，It can be punctured and picked with a sharp shovel
2015-02-20 Reading quantity 1552
introduction：Turntable 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。]It is able to withstand a large axial load at the same time、Medium and large bearings of special structures with combined loads such as radial load and overturning moment。 In general，The turntable bearing itself has a mounting hole、Lubricating oil holes and seals，Can meet a variety of different working conditions
2015-02-20 Reading quantity 1547
introduction： The ratio of the maximum cylinder volume to the compression volume of an internal combustion engine﹐It is an important structural parameter of internal combustion engine(See picture Compression ratio definition )。The cylinder has maximum volume when the piston is at BDC﹐withVαexpression﹔The volume in the cylinder when the piston is at TDC is called the compression volume﹐withVc expression。Compression ratio of internal combustion engineεfor ε=Cylinder compression volume+Cylinder working volume/Cylinder compression volume=Vc+Vh/Vc=Vα/Vc εIs the geometric compression ratio﹐It indicates the extent to which the gas in the cylinder is compressed when the piston moves from BDC to TDC。
2015-02-20 Reading quantity 2877
introduction：The biggest difference between the design and selection method of general reducer and special reducer is，The former applies to all industries，But the deceleration can only be designed according to a specific working condition，Therefore, when selecting, users need to consider different correction coefficients according to their respective requirements，The factory should choose the actual motor power（Not the rated power of the reducer）Play a nameplate；The latter is designed to the specific conditions of the user，The factor of consideration，Design is generally taken into account，Selection as long as the use of power is less than or equal to the rated power of the reducer can be，The method is relatively simple。 The rated power of the universal reducer is generally used（Working condition）coefficientKA
2015-02-20 Reading quantity 2774
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