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introduction：Use30More than an hour later，The shaft of the gear reducer is bent，The shaft broke during cold alignment。Through macro and micro analysis of fracture axis、Metallographic examination and hardness determination，It is considered that the axis is subjected to symmetric rotational bending loads under stress concentration conditions，Early fatigue fracture occurs。The reason of fatigue fracture is unreasonable heat treatment process，The mechanical properties of the material did not meet the design requirements，The fatigue resistance of the shaft is reduced，In addition, the rounding process is poor，Stress concentration occurs when working，It accelerates the fatigue fracture of the shaft。 keyword:Reduction gear；shaft；Fatigue fracture；Tool relief groove A coal mine
2015-01-14 Reading quantity 2795
introduction： 1. exordium The so-called boring machining(Boring)It refers to the expansion or refinement of the original hole on the workpiece。It is characterized by correcting the eccentricity of the lower hole、Get accurate hole position，Achieve high precision roundness、Cylindricity and surface finish。therefore，Boring as a high-precision machining method is often used in the final process。Such as，Bearings for various machines[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 are opposite each other on the shaft
2015-01-14 Reading quantity 2806
introduction： 1.The work center is not fixed During grinding the workpiece is positioned by the grinding wheel、Guide wheel and support plate are confirmed，The central position of the workpiece follows the movement of the workpiece，Its not fixed in the radial plane。 2.self-positioning The grinding surface of the workpiece is the positioning basis，therefore，The original error of the workpiece grinding surface and the error after grinding will be reflected as the positioning error，This affects the shape and size of the part of the workpiece being ground，It is then reflected as machining error。 3.The control mode of workpiece movement is special Workpiece movement is by grinding wheel、Guide wheel and plate joint
2015-01-14 Reading quantity 1441
introduction：For the last three years，In New YorkEastFishkillIn the most advanced automated semiconductor wafer factory，IBMAlways useRFIDTechnology to track thousands of chip orders。Plant footprint14Ten thousand square feet、With billions of dollars of equipment，from2002It began operation in mid-year，Is the worlds first fully automatic semiconductor manufacturing R & D factory。By integrating in product tools and devicesRFIDtechnology，Can the equipment system determine what products to process next、How to process、When to process。The factorys business systems track each semiconductor wafer，Include where they are in the process
2015-01-14 Reading quantity 2885
introduction： In the West and some newly industrialized countries，Electric furnace has a very important strategic position。Electric furnace steelmaking dominates the market for profiles and strip products，And has been involved in the flat material market。In recent years，Global electric furnace steel2．7About a billion tons，Accounting for the total amount of crude steel1／3above。European Union（According to the15Kuni Meter）The proportion of electric furnace steel has reached50％。After a series of technical transformation，The cost of EAF steelmaking has improved significantly，Power consumption drop45％，Shortening of smelting cycle75％，Electrode loss reduction75％above。 Shorten the loading time or adopt the double shell design can shorten the power failure time，mention
2015-01-14 Reading quantity 2877
introduction：FAGImported 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，Of course, the price is not cheap。]The use factor mainly refers to the installation adjustment、Service and maintenance、Whether the maintenance and repair meet the technical requirements。On the basis ofFAGImported 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，Of course, the price is not cheap。]Install、make
2015-01-14 Reading quantity 1449
introduction：Rolling mill 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。]Design problem 1.Four rows of cylindrical small roller bearings are generally used for back-up rollers，Its inner ring and roll static fit，Generally installed after the cone sleeve，Put the inner ring in，The inner ring is the outer circle of the base grinding roll，Because it cannot withstand axial forces，The axial force generated during the rolling process requires a shaft
2015-01-13 Reading quantity 1454
introduction：General operating procedures for motor assemblers are as follows： 1、pre-work，Tidying up，Keep your zeros steady、unit，And check whether the assembly tools and the working environment are safe and good。 2、Lift the motor frame、Bottom plate、stator、rotor、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。]Such large parts must be placed in the square box or cushion wood。
2015-01-13 Reading quantity 1539
introduction：Internal factors mainly refer to structural design、The manufacturing process and material quality determine the 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。]Three factors of quality。 First of all，The structure design is reasonable and advanced at the same time，There will be longerSKFbearing[SKFbearing:SKFThe full name is“Svenska Kulla
2015-01-13 Reading quantity 1563
introduction： ■The main injection forming material should be noted when forming product The name note meaning things item PVC Polyvinyl chloride 1. The range of products is very wide（rigid、soft、Polymer etc），Forming conditions vary，From melt to fractional The temperature range of the solution is very small，Especially pay attention to the heating temperature。 2. Less attached moisture，But the molding cycle is as small as possible（50℃~60
2015-01-13 Reading quantity 2912
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