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introduction： Tempering is a double heat treatment of quenching and tempering at high temperature，The purpose is to make the workpiece have good comprehensive mechanical properties。 Tempered steel has carbon tempered steel and alloy tempered steel two categories，Whether its carbon steel or alloy steel，Its carbon content is strictly controlled。If the carbon content is too high，The strength of the workpiece after tempering is high，But not strong enough.，If the carbon content is too low，Increased toughness but not enough strength。In order to make the tempering parts get good comprehensive performance，The general carbon content is controlled in0.30~0.50%。 Tempering and quenching，The whole section of the workpiece is required to be quenched，The workpiece is made of fine acicular quenched martensite
2015-03-23 Reading quantity 1441
introduction：PMMA Polymethyl methacrylate Typical application range Automobile industry（Signal lamp equipment、Instrument panel），Pharmaceutical industry（Blood containers, etc），Industrial application（Video disk、Light scatterer)，Consumer goods（Beverage cup、stationery）。 Injection molding process conditions:Drying treatment：PMMAIt has hygroscopic properties so drying before processing is a must。The recommended dry condition is90C、2~4Hour (s)。 Melting temperature：240~270C。Mold temperature：35~70C。 Injection rate：intermediate Chemical and physical properties: PMMAWith excellent optics
2015-03-23 Reading quantity 2873
introduction： 1.Raceway sound Raceway sound is due to 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。]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 the raceway sound is
2015-03-23 Reading quantity 1570
introduction：The instantaneous center of rotation in plane motion of a rigid body or a member of a mechanism。Where the instantaneous velocity is zero﹐Its called the absolute instantaneous center﹔When one rigid body moves relative to another rigid body in a parallel plane﹐Its instantaneous relative velocity is zero﹐The coincidence points with the same instantaneous absolute velocity are called relative instantaneous centers。therefore﹐The absolute instantaneous center can also be regarded as the relative instantaneous center of a moving rigid body with respect to a fixed rigid body。Both relative and absolute instantaneous centers refer to velocity instantaneous centers﹐Instantaneous center is short for instantaneous center of velocity。When the structure has fewer components﹐Using the instantaneous center to analyze the speed of the mechanism is simple and clear。The point where the instantaneous acceleration is zero is called the instantaneous center of acceleration。 How to find the instantaneous center
2015-03-23 Reading quantity 2799
introduction：line Star gear reducer light weight、Small size、Large range of transmission ratio、High efficiency、Smooth running、Low noise and strong adaptability。The reducer is widely used in metallurgy、mine、Lifting transport、electricity、Source of energy、Building materials、Light industry、Transportation and other industrial sectors。 Product description 1、PSeries planetary gear reducer adopts modular design，Can be changed according to customer requirements， 2、The reducer is driven by involute planetary gear，Rational utilization、External gearing、Power shunt， 3、The box is made of ductile iron，The rigidity and shock resistance of the box are greatly improved， 4、All gears used
2015-03-23 Reading quantity 2777
introduction：influenceSKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，Is a leader in bearing technology and manufacturing。SKFBearings can be divided into sliding according to different specific structures and similarities and differences in working propertiesSKFBearing and rollingSKFbearing]For many rotating machinery products, their service life depends on the life of the bearing components in the key parts of the product。 “maintenance-free”Bearings do not mean that bearings will never be damaged or fail but
2015-03-23 Reading quantity 1554
introduction： The following is<<Physical properties of commonly used engineering plastics>>,Got everything,The shrinkage rate is also in there. one、P S（polystyrene） 1 .PSThe performance of： PSIt is an amorphous polymer，Good liquidity，Low water absorption（Less than00.2%），It is a transparent plastic that is easy to form and process。The light transmittance of its products reaches88-92%，Strong coloring，High hardness。butPSHigh brittleness of products，Easy to produce internal stress cracking，Poor heat resistance（60-80℃），non-toxic，Specific gravity1.04gcm3around（Slightly larger than
2015-03-23 Reading quantity 2896
introduction：The main observation is whether the rivet head is offset、skew、slack、Short of meat or“Double eyelids’Whether the welding position is correct，Adhere to the riveted or welded quality of the frame。Solder joints too big or too small，Whether the welding is not strong or excessive welding caused by stuck rolling。The above items are checksKOYOUnidirectional 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。]Middle point
2015-03-23 Reading quantity 1452
introduction：In a cycle of a piston machine，The gas pressure in the cylinder moves with the piston（Or cylinder content volume）And the cyclic curve of change。The area enclosed by the cyclic curve can be expressed as the work done or the work consumed by the machine，Therefore, it is called indicator diagram，It can be recorded with indicator。The indicator diagram shows in addition to the amount of work done or work consumed，It is often used to analyze and improve the working process in the cylinder。 Internal combustion engine indicator diagram1a[Indicator diagram of internal combustion engine]It is the actual indicator diagram of four stroke internal combustion engine。The ordinate indicates the gas pressure in the cylinder,The horizontal coordinate indicates the working volume of the cylinderV。Line segment1-2
2015-03-23 Reading quantity 2782
introduction：China is a major energy producer and consumer in the world，Energy saving is urgent。We need to fundamentally address energy constraints，To meet the needs of sustained and rapid economic growth，We must persist in saving money，We will also develop new technologies and materials，Take a low-energy leapfrog development road，Build a conservation-oriented society。 We actively study the thermal insulation of door and window curtain wall structure at the same time，It must be realized that the development of high-tech new materials is an important basis for building energy conservation，Only materials with excellent properties，In order to ensure the lasting thermal insulation performance of the external protection project，Ensure the energy saving effect of the whole building project in its whole life cycle。 Carry out construction
2015-03-23 Reading quantity 2892
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