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introduction：holdKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inKOYOBearing in the processing process，The outer ring of the bearing、Inner ring、How do the roller and cage fit together。]And clean lubrication is very important。 Clean the surface of the machine before inspection，Then disassembleKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，But inside and out
2015-02-26 Reading quantity 1553
introduction： With precision coordinate positioning device﹐A boring machine used for machining high-precision holes or hole systems。Drilling can also be done on the jig boring machine﹑reaming(Sight drilling)﹑reaming(See reaming)﹑milling﹑Precision marking and precision marking﹐It can also be used for precision measurement of hole spacing and profile dimensions。Jig boring machine is suitable for machining drill dies in tool shop﹑Boring die and measuring tool, etc﹐It is also used in production workshops to process precision workpieces﹐It is a kind of high-precision machine tool with a wide range of uses。(See color diagram Horizontal jig boring machine) Brief history 20Early century﹐On account of
2015-02-26 Reading quantity 2782
introduction： For 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。]In terms of use，Be sure to perform regular maintenance and maintenance，When we size the bearing accuracy、Rotation accuracy，There are also internal internal clearance and mating surfaces，Raceway surface，Rolling surface，Cage and seal ring equal time，If anomaly，They all need to be repaired，Even replace
2015-02-26 Reading quantity 1451
introduction：Planetary reducer in the run-in period has some common problems，Including loosening、wear、leakage，The main reason for these problems is that the device performance is not familiar enough，New equipment assembly gap is too small。For the main unit situation general in the following one by one analysis： 1、Operation error：Due to the structure of the gear motor、Performance is not well understood，Easy to cause faults due to misoperation，Even cause mechanical accidents and safety accidents。 2、loosen：Newly machined and assembled parts，There are deviations in geometry and fit sizes，At the beginning of use，Take a hit、The vibration is alternating negative
2015-02-26 Reading quantity 2789
introduction： 1、Determine the number of work steps reasonably：The number of steps of a continuous die is equal to the sum of the decomposed single steps，Like punching—The number of work steps of blanking continuous die，It is usually equal to the sum of the two single processes of punching and blanking。But in order to increase the strength of the die and facilitate the installation of the punch，Sometimes this can be done in several steps depending on the number of holes。The principle of determining the number of work steps，Mainly in the principle of not affecting the strength of the die，The fewer steps you choose, the better，The fewer work steps，The smaller the cumulative error，The higher the dimensional accuracy of the workpiece rushed out。 2、In the punching and blanking process sequence arrangement，The punching process should be put in front，Not only can this
2015-02-26 Reading quantity 2781
introduction： SKFNeedle roller 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。]Vibration is sensitive to bearing damage，exfoliation、impression、corrosion、crack、Wear and tear will be reflected in the bearing vibration measurement，therefore，By adopting specialSKFNeedle roller bearing vibration measuring instrument（Frequency analyzer）Can be
2015-02-26 Reading quantity 1529
introduction：Properties and structure of stainless steel Currently known chemical elements are100variety，There are about 20 kinds of chemical elements that can be encountered in steel materials commonly used in industry。For people in the practice of long-term struggle against corrosion phenomenon of stainless steel this special steel series，There are more than a dozen of the most commonly used elements，Except for iron, the basic element that makes up steel，The elements that have the greatest impact on the properties and organization of stainless steel are：carbon、chromium、nickel、manganese、silicon、molybdenum、titanium、niobium、titanium、manganese、nitrogen、copper、Cobalt et al。These elements are decarbonized、silicon、extra-nitrogen，All are transitional group elements in the periodic table。
2015-02-26 Reading quantity 1538
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。]Basic knowledge Section 1 Basic structure of rolling bearing Rolling bearings developed on the basis of plain bearings，Its working principle is to replace sliding friction with rolling friction，Usually consists of two ferrule，A general assembly consisting of a set of rolling elements and a cage
2015-02-26 Reading quantity 1732
introduction： The main factors affecting the hardenability of steel are；Chemical composition of steel、Quenching heating temperature、Characteristics of cooling medium、Cooling methods、The shape and size of the parts and the heating method。 The chemical composition of steel is one of the most important factors affecting hardenability。Usually caused in steel“c”Alloying elements whose curves shift to the right or left，Both have a great effect on the hardenability。make“c”Elements shifted to the right of the curve will improve the hardenability of the steel；make“c”Elements shifted to the left of the curve will reduce the hardenability of the steel。Such as45Steel and40Crsteel，It contains about the same amount of carbon，but，Because the former does not contain chromium，after
2015-02-26 Reading quantity 2879
introduction：now，The hardness of abrasives is often expressed by microhardness。Microhardness is a kind of pressed hardness，Reflects the ability of the object to resist being pressed by another hard object。The measuring instrument is a microhardness tester，Its actually a microscope with a loading device and an eyepiece micrometer。predetermination，First, the abrasive to be measured is made into a reflective abrasive sample，Placed on the microhardness testers platform，A four-pyramid diamond indenter is pressurized by a loading device。The size of the load can be increased or decreased according to the hardness of the material to be tested。After the diamond indenter is pressed into the specimen，A pit is produced on the specimen surface。Aim the microscope cross at the pit，Use eye
2015-02-26 Reading quantity 2801
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