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introduction：jinshu gongyixue Metal technology metal processing technology The study of metal materials in machine building(Or blank、Semi-finished product)Smelting of...、cast、Forge and press、weld、Heat treatment of metal、Cutting process、The discipline of processes and methods of mechanical assembly, etc。 Feng Zi
2015-04-17 Reading quantity 2784
introduction：one、 PS（Often called hard glue）：1、inundate24Only absorb water after hours0.04%。2、friability、inflammable、Aging easily，It turns yellow easily after long exposure to sunlight、fade。3、PSWill sink in water，Heating with fire will soften the burn，Emitting a black yellow flame and smell，The smell is especially strong after the fire is extinguished，No need to clean with other materials。4、contractility0.4%，Glass coated fiber25%GFFollowed by0.2%。5、drying70℃（2-3H）。Dry with raw materials2Hour (s)，When adding spout material or wet weather（2month~5month）3Hour (s)。6、Metal insert：Metal preheating80
2015-04-17 Reading quantity 2793
introduction：lunxi Gear train train A transmission system consisting of a series of wheels。These wheels are usually gears，It can also be friction wheels, etc。According to the geometric axis of each gear in the gear train is fixed or not, it can be divided into fixed shaft gear train and planetary gear train。 The geometric axis position of each wheel of the fixed axle gear train is fixed，Its transmission ratio is [470-11]Formal neutralization、Separately gearedaAnd gearkThe rotational speed and angular velocity；coefficient(-1)Where is the number of external meshing gears of the gear train,When even，Coefficient is positive,Indicates that the driving wheel and the driven wheel steer the same；for
2015-04-17 Reading quantity 2808
introduction：A bridge type crane developed from the gantry crane to increase the span﹐Also known as loading bridge。For open-air storage﹑Ports and railway freight stations。Ordinary carrying bridge(figure1 Ordinary carrying bridge )Similar to the structure of a large gantry crane。It is characterized by﹕ Handling objects are mainly large quantities of bulk materials﹔ Large span﹐Generally in30Meter or more﹐Yenda170meter﹔ Frequent operation﹐High productivity﹐Generally speaking500～1500Tons of/when﹐High working speed﹐Lifting speed is60～70meter/points﹐The running speed of the car is100～350meter/points﹐Higher level of work﹔ The carriage of the bridge
2015-04-17 Reading quantity 2816
introduction：Ceramic cutting tools in the following aspects of cutting processing，It shows its superiority： 1、It can process high-hard materials that are difficult to process with traditional tools or can not be processed at all，For example, hardness up toHRC65Various types of hardened steel and hardened cast iron，Thus, the electricity consumed by annealing processing can be eliminated；And therefore can also improve the hardness of the workpiece，Extend the service life of machinery and equipment； 2、Not only can be coarse for high hardness materials、finishing，Milling is also possible、planing、Intermittent cutting and rough drawing and other high impact processing； 3、Tool durability is several times or even dozens of times higher than traditional tools，decrease
2015-04-17 Reading quantity 2879
introduction：Thermoplastic injection molding This method is to melt the plastic material，It is then injected into the membrane cavity。Once the molten plastic enters the mold，It is cooled and molded into a certain shape according to the mold cavity。 The resulting shape is often the final product，No additional processing is required before installation or use as a final product。Many details，bulges。rib、Screw thread，Can be molded in a single injection molding operation。 Injection molding machines have two basic components：Injection device and closing device for melting and transferring plastic to mold。The function of the mold closing device is：（1）Make the mold withstand the injection pressure
2015-04-17 Reading quantity 2882
introduction：By pairLCAnalysis of card communication interruption，Find out the reason，Take countermeasures，Including cabinet floating，Instruction redundancy，Production of special grounding network and other measures，Make sureMEHThe system runs safely for a long period。 System overview MEH-ⅢAThe control system consists of a given part、Feedback part、regulator、The actuator and the unit object are composed，As shown in the figure1As indicated。Its control functions include automatic control of boiler feed water flow and feed pump turbine speed，Control valve valve position control，Normal operation and monitoring，Overspeed protection and testing，withDEH-ⅢAnetworking，inDEH-ⅢAOperator station
2015-04-17 Reading quantity 2790
introduction：one、 Conscientiously implement《General operating regulations for forging equipment》Relevant provisions。 two、Conscientiously implement the following supplementary provisions： （one） Work hard before you start： 1、 Check the mold should be intact without cracks，Properly installed，fastness。 2、 Clean up debris in the slider travel space and mold space。 3、 The mold should be preheated to150°С~200°Сaround，Take out the preheater before working。 4、 Before starting the main motor，The solenoid valve of the clutch should be tested first，Confirm valve action and clutch、Accurate brake action、sensitive、Start the main motor only when it is reliable
2015-04-17 Reading quantity 2873
introduction： With the increase of demand for plastic products and the expansion of application fields，Higher and higher requirements are put forward for plastic molds，Promote the continuous development of plastic molds，At the same time, it also led to the rapid development of plastic die steel，Mainly in the development of plastic mold steel accelerated，Rapid increase in variety，However, at present, the plastic mold material is still mainly steel。According to statistics，Chinas plastic die steel has accounted for more than half of all die steel。Reasonable selection of plastic die steel and heat treatment process To ensure the quality of plastic mold，It is important to improve the service life of plastic mold and reduce the production cost。 ⒈Working conditions of plastic molds
2015-04-17 Reading quantity 1545
introduction： In order to ensureSKFTapered roller bearings[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。]Long life，The method of oil lubrication is more reliable than that of grease lubrication，As long as you choose the right oil,Well filtered，Fuel supply，Regular inspection and timely replacement，The key is to ensure membrane roughnessλIn-greater than1As close as possible4，
2015-04-17 Reading quantity 1446
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