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introduction：Machine tool industry pairSKFRails demand Rexroth sliders The use of rolling guide rails on machine tools is mainly used in the following three parts：Principal axis、Ball screw and general drive shaft。 The spindle guide rail is used as the basic accessories of the machine tool，Its performance directly affects the machine
2015-04-16 Reading quantity 64744
introduction：youji fuceng Organic coating organic coatings The surface of the base material is coated with a material protection layer of organic material。In machine building，The vast majority of organic coatings are coating layers，Or paint layer。In addition，It is also coated with rubber or plastic。Need acid resistance、Alkali and steel parts resistant to corrosive gases and liquids，Normal thickness contract 3Millimeter rubber（Such as neoprene）Or plastic（Such as vinyl chloride copolymer）Stick to the surface，Can protect the matrix from corrosion for a long time。This coating is mainly used in large corrosion resistant vessels or exhaust systems。Buried in the soil
2015-04-16 Reading quantity 2806
introduction：huadong fangzhi gongxueyuan East China Textile Institute East China Institute of Textile Science and Technology Be founded in1951years，By Shanghai Textile Institute of Technology、Department of Textiles, Jiaotong University、Department of Textile, Nantong University、Department of Textile, Shanghai Industrial College、Sunan industrial College textile department, etc12The textile department of the university was adjusted and merged（See attached table[East China Textile Institute of Technology consolidated name change table over the years]）
2015-04-15 Reading quantity 2822
introduction：The main factor used for adjustment is installation，Use and maintenance，Maintenance and repair，Technical requirement。Factors for installation and use，First factor，INAbearing[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。]Improper installation often results in a change in the stress state between bearing parts，Early bearing failure during operation and abnormal condition。Bearing structure design simultaneously
2015-04-15 Reading quantity 1471
introduction： 1 、Concept of steel： Steel is iron、An alloy of carbon and small amounts of other elements。 Steel is ingot、Billets or steel are pressed into the shapes we need、Size and properties of materials。 Steel is an essential material for national construction and the realization of the four modernizations，Widely used、Wide variety，Depending on the shape of the section、Generally divided into sections、board、Pipe and metal products four categories、In order to facilitate the organization of steel production、Order supply and do a good job in operation and management，It is divided into heavy rail、Light rail、Large section steel、Medium section steel、Small section steel、Cold formed steel，High-quality section steel、Wire rod、Medium thickness steel plate
2015-04-15 Reading quantity 1553
introduction：A heat exchanger that uses steam to heat boiler feedwater。The use of feed water heater in steam turbine feed water recovery system can improve the cycle efficiency（See steam turbine thermal performance）。The heating steam is steam extracted from the intermediate stage of the turbine。The design of heater is related to the working conditions of steam turbine feedwater reheating system。The feed water heater can be divided into two types according to the heat transfer mode: hybrid type and surface type。The steam is in direct contact with the water supply and the heat of the steam is transmitted to the water supplier；The heat of the steam is transmitted through the metal tube wall to the feedwater supplier. The surface heater is pressed to the pressure of the feedwater being heated,The feed water heater is divided into low pressure heater and high pressure heater。Bring me water
2015-04-15 Reading quantity 2799
introduction：yeyabeng Hydraulic pump hydraulic pump A hydraulic element that provides pressurized fluid for hydraulic transmission，Its a kind of pump。Its function is to put the power machine（Such as electric motors and internal combustion engines）The mechanical energy is converted into the pressure energy of the liquid。The output flow can be adjusted according to the need called variable pump，The flow rate can not be adjusted called quantitative pump。The commonly used pumps in the hydraulic system are gear pumps、Vane pump and plunger pump 3Kind of。①Gear pump：Small size，Relatively simple structure，The cleanliness of the oil is not strictly required，Cheaper price；But the pump shaft is subject to unbalanced forces，Severe wear，Leakage ratio
2015-04-15 Reading quantity 2797
introduction：Powered by the sudden release of energy from a high-pressure gas、Lower hammer head high speed movement，Hanging counterattack，Forging method for forming metal plastically。High speed hammer forging is a high energy rate forming method，Mainly used for precision die forging and hot extrusion。 The first high speed forging hammer appeared in1955years。figure1 [Working principle of high speed hammer]The working principle of the high-speed hammer。Instant release of high pressure gas（The pressure is generally15000mpa），Force the hammer down9～24meter／High speed motion in seconds，Also push up the head of the high pressure cylinder，And drive the whole frame upward movement。The upper die on the hammer head meets the lower die on the frame in the air
2015-04-15 Reading quantity 2797
introduction：(1)、Reduce the amount of hydrogen infiltration in the metal High intensity must be minimized/Pickling of high hardness steel fasteners，Because pickling can increase hydrogen embrittlement。During rust removal and oxidation，Try to adopt the method of sand blasting and shot blasting，If Rockwell hardness is equal to or greaterHRC 32When the fasteners are pickling，The pickling process must be developed to ensure that the parts are immersed in acid for a maximum time10minutes。The concentration of acid should be reduced as much as possible，And ensure that the parts in the acid soaking time does not exceed10minutes；When removing oil，Chemical degreasing methods such as cleaning agent or solvent degreasing are used，Less hydrogen infiltration，If using electrochemical
2015-04-15 Reading quantity 1559
introduction：1 introduction Hydraulic system with multiple actuators，Almost all have the technical requirements of synchronous operation。Especially under unbalanced conditions of heavy loads，Synchronization requirements are more prominent：Or else，It will cause poor equipment performance、Lose effectiveness，It can even be seriously damaged。therefore，The design scheme of synchronous system、Control method、The research on synchronization performance has important technical significance。 This paper is based on many years of practice and experiment，A new synchronization system is proposed，The system is based on the high synchronization performance obtained by pump control on the main oil circuit，An auxiliary valve control compensation system is also designed。Due to the valve control compensation system of high control accuracy and fast
2015-04-15 Reading quantity 2909
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