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introduction： Fast cycle，The design and manufacture of blow molding mold with long life is required by the development of blow molding industry。The factors that determine the efficiency of the mold are：l）Materials；2）cooling；3）Cutting edge design；4）venting。 The material for making the mold must have high thermal conductivity and sufficient cutting edge strength。Current aluminum70／75Its a high-grade alloy used in most molds。Because the metal has good machinability，Therefore, the mold cavity is usually made by machine cutting。The copper alloy mold also has high heat transfer and good corrosion resistance。however，Its high cost，expensive，And because its specific gravity is three times that of aluminum，probably
2015-01-07 Reading quantity 2786
introduction： 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。]Around sea and land oil、Natural gas development，Counter oil、Ethylene and three major synthetic materials（Synthetic resin、Synthetic rubber、Synthetic fibre）The amount of demand required will be6％to9％The growth rate of。So need
2015-01-07 Reading quantity 1458
introduction：Impact 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。]There may be many factors of service life，Can be further elucidated from the use of elements and connotation history。 Use element first if refers to device adjustment、Active nursing、Whether maintenance and repair can meet technical requirements。basisINABearing device、Apply、maintenance、Technical requirements for nursing，
2015-01-07 Reading quantity 1554
introduction：1.Fatigue pitting 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。]Time of loading.In the rolling body with inside、The contact surface of the outer ring will produce contact stress.Inne、The outer ring and the rolling body have relative rotating motion when working，Therefore, the contact stress is a pulsating cyclic change。When the contact stress exceeds the limit value，Fatigue cracking occurs under the surface
2015-01-07 Reading quantity 1448
introduction：The gear adopts two forms of oil pool lubrication and circulation lubrication，Manufacturers recommend the use of medium pressure industrial gear oil，Soft flank、Medium hard tooth surface reducer：N100～150，Hard tooth surface and planetary reducer：N220～320。Our factory uses the same nature of Esso320＃Extreme pressure gear oil。 Lubricating oil should be checked and replaced regularly，When the newly installed reducer is used for the first time，In operation10－15Days from now，New oil needs to be replaced。Subsequent due period（2-3month）Check the quality of the oil，It should be replaced immediately if it does not meet the requirements，Generally, the oil is changed at least once every six months。Were testing the oil
2015-01-07 Reading quantity 2818
introduction：one．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。]： (one)General introduction to rolling bearings 1.Rolling bearingrollingbearing Bearings that move in rolling motion between supporting loads and parts that move relative to each other，It includes raceways
2015-01-07 Reading quantity 1572
introduction： one，Basic usage method All single-disc electromagnetic clutches with brakes and their combined clutches，The friction plates of the power loss brake are dry without interference from grease substances Type of conditions to use，Once the grease enters between the friction pairs the torque will drop sharply，Even the suction clutch and brake，will There is a risk of skidding。 Press the role of the electromagnetic clutch and brake in the mechanical transmission system，It is often difficult to separate use cases into single use items the。For the convenience of use classification summed up according to its main purpose of use to distinguish,Electromagnetic clutches can be classified as follows：
2015-01-07 Reading quantity 2799
introduction：The drillability of rock is the basic factor that determines the drilling efficiency，It reflects how easily the rock is broken when drilling，It is a reasonable choice of drilling method、The basis of drill structure and drilling specification parameters。The drillability of drill bit when drilling into formation rock is analyzed，Be able to understand the rationality of bit selection and adaptability to formation。Generally, the product of the mechanical penetration rate and footage of the drill bit is used as a measure of the index。 The basic properties of rock that affect the drillability of rock are：Mineral composition and structural structure of rocks、density、porosity、Water and permeable；The mechanical properties are hardness、intensity、elasticity、brittleness、Plasticity and abrasiveness, etc。Common rock-forming minerals
2015-01-07 Reading quantity 1464
introduction：The whole is lined with positive plain 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。]Seat size type No. D (D4)
2015-01-07 Reading quantity 1450
introduction： The wavelength of krypton light or helium light is taken as the known length﹐Using the phenomenon of light wave interference(See laser length measurement technique﹑Flat crystal)High precision length measuring tool for calibrating gauge blocks with fractional weight method。What is measured on the Coriolis interferometer is a fractional fraction of the total number of interference fringes corresponding to the full length of the measure block﹐Therefore, we need to use the fractional multiplication method to find the full length of the measure block。Start with an allowable error of less than 1The micron length measuring tool measures the measurement value of the measuring block﹐And calculate the range of variation(For example in98.123～98.124Between millimeters
2015-01-06 Reading quantity 2914
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