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introduction： The ratio of angular velocities between two rotating members of a mechanism，Also called speed ratio。componentaSum memberbThe transmission ratio isb＝/ b＝/b，Formal neutralization bSeparate componentsaandbAngular velocity of(radian／seconds)；andbSeparate componentsaandbSpeed of（turn／points）。When the angular velocity in the formula is instantaneous，Then the transmission ratio obtained is the instantaneous transmission ratio。When the angular velocity in the formula is the average，The transmission ratio obtained is the average transmission ratio。Correct gear drive and friction wheel drive for most tooth profiles,The instantaneous transmission ratio is constant for chain drive and non-circular gear drive，The instantaneous transmission ratio is variable。For mesh drive，
2015-03-26 Reading quantity 2803
introduction：Rolling 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 joint venture with the axis is commonly referred to as a transitional joint venture，The joint venture between the seat ring and the bearing seat hole is generally a gap joint venture。The central shaft ring of the bidirectional bearing shall be fixed on the shaft，To avoid transitions associated with axial migration。KOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，the
2015-03-26 Reading quantity 1485
introduction： The development trend of automatic clutch Automatic clutch application models are mainly in3On cars and commercial vehicles under tons。Because the automatic clutch has obvious advantages over the manual transmission in many aspects，So it will occupy a lot of space for development in the traditional market of automobiles。 It is not difficult to see from the official statistics what a huge market this is。This product uses the leading electronic mold control technology，It is designed for manual transmission models。Controlled by an advanced microelectronic system，Simulate the best driving skills
2015-03-26 Reading quantity 2827
introduction：A tool is a tool used for cutting in mechanical manufacturing，Also known as cutting tools。Generalized cutting tools include cutting tools，Also includes abrasive tools。The vast majority of knives are for machine use，But there are hands, too。Because the tools used in mechanical manufacturing are basically used to cut metal materials，therefore＂cutter＂The term is generally understood to mean metal cutting tools。The cutting tools used for cutting wood are called woodworking tools。 The development of knives plays an important role in the history of human progress。China was as early as BC28～before20century，Brass cones and copper cones have appeared、drill、Knives and other copper knives。Late Warring States period(Third century BC)
2015-03-26 Reading quantity 2888
introduction：Our country is a big coal producing country in the world，To meet the rapid increase in demand for coal，The installed power of many coal mining machines has doubled，Therefore, the requirements for mechanical transmission parts are getting higher and higher，The traditional transmission structure of fixed shaft gear train can not meet the new working requirements，It is imperative for coal mining machinery to adopt planetary gear transmission。The planetary gear transmission of the planetary reducer has the characteristics of power distribution，Each center wheel can form a coaxial drive，And the internal meshing gear pair is used reasonably，So it can be small、Light weight、Compact structure and strong bearing capacity。In addition，Symmetry of planetary gear transmission structure，Also make
2015-03-26 Reading quantity 2842
introduction：advantage “laser”Can concentrate a very large amount of energy in a very small point of action。Compared with traditional welding and fusion welding processes，This will bring many advantages： The machining precision has been doubled。The high temperature zone of laser weld will react due to heat。Because the laser weld width is relatively narrow，These small high temperature regions also make the resulting thermal deformation very small。 The power and size of the laser focus can be dynamically adjusted according to the processing requirements，At the same time, the processing process is monitored in real time，Achieve a wide variety of application possibilities。 When using solid-state lasers，Can be flexible away from the fuck
2015-03-26 Reading quantity 2901
introduction：Horizontal upsetting machine for forging the ends of long bar and pipe materials。Flat forging machines are available 3Species motion mechanism。①punch（punch）：Reciprocating motion in the horizontal direction，Generally configurable4～6Individual impression，Is used for accumulation、heading、punching、Forming mechanism of upsetting sequence such as flanging，It is also the main force mechanism。②Movable die：competence、Downward or lateral opening and closing，Used to hold long bar material，And bear the end upsetting force。③Cut-off mechanism：Used to separate the forging from the long bar material。The flat forging machine is driven by the crank slider mechanism，Because the workpiece is large,The upsetting force and clamping force are large,The machine needs to have sufficient stiffness,To ensure flat forging
2015-03-26 Reading quantity 2798
introduction： Three-dimensional space laser calibration replaces one-dimensional laser calibration Dr. Wang Zhengping, President of Light Motion Corporation Optodyne,Inc. Compton,California,USA optodyne@aol.com Global competition and quality standards，Higher positioning accuracy is proposed for the machine tool、Smaller tolerances and higher feed rates。In order to meet these requirements and produce high quality and high precision parts，The 3D volumetric positioning accuracy of the machine must be measured（1,2,3）。 Twenty years ago，The maximum positioning error of the machine
2015-03-26 Reading quantity 2908
introduction：one：Fixtures are classified according to their use？ a：（1）Universal fixture （2）Assembly frame two：Check the types of samples？ a：（1）Inner template （2）Outside template （3）Solid template three：What are the common defects of cold working components？ a：（1）Dimensional error （2）Form error （3）Surface defect four：What kinds of pressure tests are there？ a：（1）Hydrostatic test （2）Air pressure test five：What are the common nondestructive testing methods？ a：（1）Radiographic inspection （2）Ultrasonic inspection （3）Magnetic particle detection
2015-03-26 Reading quantity 2894
introduction： Two spiral channels are made from two parallel coils of metal plates﹐cold﹑A heat exchanger in which heat is exchanged between hot fluids through a spiral plate wall。 Structural pattern Spiral plate heat exchangers are available in detachable and non-detachable types。The structure of non-detachable spiral plate heat exchanger is relatively simple﹐Both ends of the spiral channel are welded shut。Detachable spiral plate heat exchanger(See picture Detachable spiral plate heat exchanger )In addition to the sealing structure at both ends of the spiral channel﹐The other is exactly the same as non-detachable。To achieve the purpose of mechanical cleaning﹐Detachable spiral channel﹐Open at one end﹐Seal with flat cover and gasket﹐To prevent fluid leakage
2015-03-26 Reading quantity 2799
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