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introduction：In the planar linkage mechanism﹐If the rocker or slider is the active part﹐When the other two moving members are in the same straight line position﹐No matter how much driving force﹐Cant get the mechanism started。As in the crank rocker mechanism(figure1 Dead center of the crank and rocker mechanism )In the﹐When the rocker is active and the crank is in two limit positions in line with the connecting rod(DC 1B 1A andDC 2B 2A)when﹐The force transmitted by the connecting rod to the crank cannot produce a moment to turn the crank。Slider mechanism in crank(figure2 Dead center of the crank slider mechanism )In the﹐There are also two dead spots when the slider is active(CBA andC 1
2015-02-17 Reading quantity 2879
introduction：Recently learned from the China General Machinery Industry Association reducer branch，With the further increase of national infrastructure construction，In recent years, Chinas reducer industry has developed rapidly。According to the statistics of the speed reducer branch，Last year，The whole industry produces reducer45Ten thousand units，Realize sales revenue20Hundred million yuan，Export treaty1Hundreds of millions of dollars。Expert prediction，“The 11th Five-Year Plan”period，Due to the development of the countrys overall economy，The growth rate of the total economic volume of the reducer industry will still reach double digits。 The development of reducer in our country has been recent40History of the year，It is widely used in the national economy and national defense industry
2015-02-17 Reading quantity 2755
introduction： 由外齿轮齿廓为变态摆线﹑内齿轮轮齿为圆销的一对内嚙合齿轮和输出机构所组成的行星齿轮传动。除齿轮的齿廓外﹐其他结构与少齿差行星齿轮传动相同。摆线针轮行星减速器的传动比约为6～87﹐效率一般为0.9～0.94。图 轮齿曲线的形成 为轮齿曲线的形成原理。发生圆在基圆上滚动﹐若大於r1﹐M'点画出的是长幅外摆线﹔若小於r1﹐M''点画出的是短幅外摆线﹔用这些摆线中一根曲线上的任意点作为圆心﹐以针齿半径
2015-02-17 Reading quantity 2787
introduction：In an acidic electrolyte，Aluminum as anode，Material protection technology for producing oxide film on aluminum surface by electrolysis。There are many electrolytes for anodizing aluminum，But its basically sulfuric acid、Chromic acid、Glyoxic acid or boric acid is the main component。One of the most commonly used is sulfuric acid based。The power supply can be DC、Ac or alternating DC。Voltage in 5～25watuma，Temperature below25℃。During electrolysis，The anion of oxygen reacts with aluminum to produce an oxide film。The membrane is not dense enough to form，There is some resistance，The negative oxygen ions in the electrolyte can still reach the surface of aluminum and continue to form an oxide film。With the increase of film thickness，resistance
2015-02-17 Reading quantity 2785
introduction：F——Deep groove ball bearings with flange outer ring[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。]（Suitable for inside diameters<10mm），case：F 605 HR——High load tapered roller bearing，case：HR30207J MF——Deep groove ball bearings with flange outer rings of specific dimensions
2015-02-17 Reading quantity 1439
introduction：Precautions before installation 1) 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。]Preparation for On account ofINAImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，
2015-02-17 Reading quantity 1540
introduction：An institution of higher learning in China for training various specialized personnel in the chemical industry。1958years9June founded in Beijing mainly to train chemical engineering、Polymer material、Chemical machinery、Production process automation、Advanced professionals in industrial management engineering and applied chemistry。Undergraduate system4years，Management cadre specialty2～3years。1978Began to train graduate students,Years of study2～3years。1983years,School establishment5Individual system（include10major：Department of chemical Engineering、Department of Automation, Department of Mechanical Engineering, Department of Polymer Chemistry、Department of management engineering。1961Since the beginning of the evening university，Existing chemical industry、Chemical machinery、Give birth to
2015-02-17 Reading quantity 2788
introduction： The utility model relates to a gear shaped or rack shaped gear processing tool。The gear shaper cutter is used for the development method(See gear machining)in-process﹑Straight and helical cylindrical gears with external meshing。The gear shaper cutter is characterized by the ability to process shoulder gears﹑Multi-gear and double-helical gear without empty slot, etc。The special gear shaper cutter can also process a variety of other profile workpieces﹐Such as cams and internal splines。(See color diagram Special shape gear shaper and the workpiece it processes ﹑ Special shape gear shaper and the workpiece it processes ﹑ Gear cutting tool──hob﹑Gear shaper cutter﹑Gear shaving cutter
2015-02-17 Reading quantity 2784
introduction：1.Large grain Large grain size is usually due to high initial forging temperature and insufficient deformation degree、Or final forging temperature is too high、Or the degree of deformation falls into the critical deformation zone caused。The deformation of aluminum alloy is too large，texturing；The deformation temperature of superalloy is too low，Coarse grains may also be induced when the mixed deformation structure is formed Large grain will reduce the plasticity and toughness of forging，The fatigue property decreased obviously. 2.Heterogeneous grain Uneven grain means that the grain in some parts of the forging is particularly coarse，Some parts are smaller。The main reason for the uneven grain is the uneven deformation of the billet and the grain breaking process
2015-02-17 Reading quantity 1452
introduction： Mainly used for manufacturing cutting tools﹑mould﹑Steel for measuring tools and other wear-resistant tools。Generally divided into carbon tool steel﹑Alloy tool steel and high-speed tool steel three categories。 Carbon tool steel Basically good quality or high quality high carbon steel﹐Carbon steel for short。Its coolness﹑Good thermal processing performance﹐The highest quenching hardness can reachHRC66～67﹐But the temper hardness is usuallyHRC60～64﹐Good wear resistance﹐Low price﹐versatile﹐The quantity accounts for about half of the whole tool steel。The main disadvantage is that﹕Low hardenability﹐Water quenching can only be quenched through the section thickness is not greater than8mmgadget﹔Poor heat resistance﹐in250﹐hard
2015-02-17 Reading quantity 2875
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