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introduction： A combination of electron microscopy and XAn electron-optical analytical instrument for X-ray spectroscopy﹐Also known as electronic microanalyzer﹑Electron probe or electron probeXGamma ray microzone analyzer。Electron microprobes are widely used in minerals﹑metallurgy﹑machine﹑Fields like electronics and biology﹐It is especially suitable for the study and analysis of microstructure and phase composition of alloys。In addition﹐It is also an ideal instrument for analyzing lunar soil and lunar rocks。asXLike a ray fluorescence spectrometer﹐The electrons suddenly stop when the high-speed moving electrons strike the surface of the solid sample﹐
2015-03-22 Reading quantity 2851
introduction：If it is managed to transfer to the non-sensitive direction of the processing error during the processing process，The machining accuracy can be greatly improved。
2015-03-22 Reading quantity 24377
introduction： CODE：00166 Device name：Gantry milling machine Type specification：Table width≥2000mm Unit of measurement：Taiwan （one）Machining accuracy
2015-03-22 Reading quantity 2824
introduction：1.1What is engineering plastic Engineering plastics refers to industrial plastics，Industrial plastics，It also includes thermoplastic and thermohardening plastics。 1.2 Engineering thermoplastic plastics include:polyformaldehyde(POM)、polycarbonate(PC)、polyamide(nylon)、denaturationPPOandPBT、PETEtc.。 1.2.1polyformaldehyde polyformaldehydePOM，Its a crystalline plastic。 A.Dry condition：The moisture absorption rate of the plastic pellet during molding is about0.1%below，Dimensional tolerance、Appearance and other quality specifications are not strict，usable0.2%~0.3%The moisture absorption rate of molding，Drying stick
2015-03-22 Reading quantity 2901
introduction： 1Basic concept 1．NSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]Life span：The total or certain number of revolutions in a bearing before any element begins to show signs of flaking and spreading
2015-03-22 Reading quantity 1470
introduction： FAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]Whether the installation is correct，Affect the accuracy、Life span、property。therefore，The design and assembly department should fully study the installation of micro-bearings。It is expected to be installed according to operating standards。The operating standard items are usually as follows： （1）Check the dimensions and finish of the associated parts； （2）Install； （3）Feed lubricant。 （4）cleanseFAGbearing
2015-03-22 Reading quantity 1541
introduction：In recent years，Medical plastic products are more and more widely used in the medical field，The reasons are mainly： ●The use of plastics in the medical field is driving product innovation that is not possible with other traditional materials。The flexibility of plastic parts in shape design makes them more and more used in the medical field instead of other materials；The very strict hygiene regulations and industry standards in the pharmaceutical industry have, to a certain extent, promoted the wide application of injection molded products in this field。 ●As the global population expands，In particular, the ageing population and the increase in the number of people suffering from chronic diseases
2015-03-22 Reading quantity 2775
introduction： Coefficient of thickness anisotropyr(Also called plastic strain ratior，For shortrvalue)It is an important parameter to evaluate the compression formability of sheet metal。rThe value is the width strain of sheet metal specimen in unidirectional tensile testεbStrain with thicknessεtRatio of，namely r=εb/εt Sheet metalrSize of value，The difference of strain capacity in plane direction and thickness direction is reflected。r=1when，It is isotropic；r≠1when，It is anisotropic。whenr＞1，It indicates that the plane direction of the plate is easier to deform than the thickness direction，Or the sheet material is not easy to thin。rThe value is related to the preferred orientation of grain in sheet metal，In essence
2015-03-22 Reading quantity 2893
introduction：The selection of mechanical seal structure type is an important step in the design process，An investigation must be conducted first： ①Operating parameter—Medium pressure、temperature、Shaft diameter and speed。 ②Medium characteristic—concentration、viscosity、corrosivity、There are no solid particles and fiber impurities，Whether it is easy to vaporize or crystallize。 ③Host operating characteristics and environmental conditions—Continuous or intermittent operation；The main unit is installed indoors or in the open air；The nature of ambient atmosphere and temperature change。 ④The allowable leakage of the host to the seal、Leakage direction（Internal leakage or external leakage）demand；Life and reliability requirements。 ⑤Host to seal structure
2015-03-22 Reading quantity 1435
introduction： 1.The reducer works for a long time when the oil pool and 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。]Will heat up，The temperature of the oil pool rises≤35℃，Bearing temperature rise≤45℃，The maximum temperature of the oil pool cannot be exceeded35℃。 2.It is recommended that the reducer be equipped with a cooling device when working for a long time，To ensure the normal operation of the reducer
2015-03-22 Reading quantity 2875
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