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introduction：There are many defects in the forging，There are many reasons for this，Caused by poor forging process，There are raw materials，Mold design is unreasonable and so on。Especially precision forgings with little or no cutting，Even more difficult to control completely。 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，Fatigue performance
2015-02-17 Reading quantity 1557
introduction：Vacuum freeze-drying technology originated in the 1820s has experienced decades of ups and downs and wandering after，Great progress has been made in the last two decades。Into the 21st century，There will be higher demands on the quality of consumer goods，Environmental awareness、Health awareness will be further strengthened，The accelerating pace of life will also make peoples demand for convenient fast food increasingly strong。This has strongly promoted the further development of vacuum freeze-drying technology，Make its application scale continue to expand、The field of application continues to expand。therefore，Vacuum freeze-drying will become an important application technology in the 21st century。 Freeze drying basic
2015-02-17 Reading quantity 2927
introduction： 1)structure 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。]According to the direction of load bearing can be divided into centripetal bearing and thrust bearing。Radial bearings are mainly used to withstand pure radial loads such as deep groove ball bearings、Cylindrical roller bearings、Needle bearings, etc。Thrust bearings are mainly used to withstand pure axial loads such as thrust balls(roller)bearing
2015-02-17 Reading quantity 1499
introduction：Imported high speed precision angular contact ball 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。]，It is mainly used for high-speed rotating occasions with light load，High bearing accuracy required、High speed of revolution、Low temperature rise low vibration and certain service life。It is often used as a pair installation of high-speed motorized spindle support，It is the key accessory of high speed electric spindle for internal surface grinding machine。 The main
2015-02-16 Reading quantity 1576
introduction：Abstract：This paper mainly introduces the improvement of welding method of manhole flange and plate of spherical tank。 keyword：Ball can inlet flange plate Track submerged arc automatic welding one、introduction The molding workshop of our factory is specialized in manufacturing spherical tanks，The largest amount of welding in the manufacturing process is the welding of the flange plate。Hand welding has been used for many years，Because most of the spherical tank shell plate is relatively thick，Therefore, the welding workload is larger，The labor intensity of workers is high，Low production efficiency，Poor appearance，The workload of weld surface treatment is large，Welding quality is unstable，Therefore, our factory has set up a special technical reform
2015-02-16 Reading quantity 2798
introduction： Storage equipment in bulk material handling mechanized systems(See Material handling machinery)﹐Mainly for intermediate storage﹑System buffering and balancing operations。The silo device consists of the silo and feed﹑discharge﹑Controls﹑measure﹑Distribution and dust removal equipment composition。The grain storage bin also has steaming and fumigation equipment﹐The material bin for easy arcing is also equipped with an arch breaking device﹐There are also fire and explosion-proof equipment in the silo for storing flammable materials。 Stock bin A container for storing materials﹐Usually steel structure or reinforced concrete structure。The geometry of the bunker﹕The upper part is mostly cylindrical or prismatic﹐The lower part shrinks into a cone with a discharge opening
2015-02-16 Reading quantity 2803
introduction： Along with our country industry is developing unceasingly，Factory mechanization、The degree of automation is increasing，Factories are also using more electricity each day，In order to ensure the safety of electricity、reliability，Prevent the occurrence of personal electric shock accidents．，The safety protection of low-voltage power supply system is particularly important。 one、Characteristics of low voltage power supply system The low-voltage power supply system consists of the low-voltage distribution cabinet in the main distribution room、Low-voltage transmission cable；Each user accesses the main distribution cabinet、Distribution box、Electrical equipment, etc。Low-voltage distribution lines are used to transport and distribute electrical energy to low-voltage electrical equipment，Multiple with connectors、Many specifications and models、There are many ways of laying、Line length，And each
2015-02-16 Reading quantity 2880
introduction： Automatically loaded and downloaded*.dmtMaterial Method 1 1、Create a folder with the following path： E:graphiclibgraphic-library And then you download itadv_materialsfile（Theres material inside.）Put it in the path you just created，Become the following path E:graphiclibgraphic-libraryadv_materials 2、Configure the search path as shown 3、Call like this！pointPHOTOLUXMaterial library
2015-02-16 Reading quantity 2894
introduction： Uneven distribution of chemical composition and impurities in steel，segregation。Generally will be higher than the average composition，This is called positive segregation，Below average composition，Its called negative segregation。There is macroscopic segregation，Such as regional segregation and micro segregation，Like dendrite segregation，Segregation between crystals。 Segregation in heavy forgings is closely related to ingot segregation，The degree of segregation of the ingot depends on the steel grade、Ingot mould、Smelting quality and pouring conditions are related。Alloying element、Impurity content、Gases in steel all increase the development of segregation。The bigger the ingot，The higher the pouring temperature，The faster the pouring speed，The more severe the segregation degree。 (1)
2015-02-16 Reading quantity 2889
introduction：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 specific judgment method of whether repair should be reported，namelyTIMKENBearing has been fully used and the specific judgment method of near failure is as follows： 1)Use the bearing working condition monitoring instrument Using a ferrograph orSPMorI-ID—1Bearing working condition monitoring instrument
2015-02-16 Reading quantity 1456
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