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introduction： Accessories to compensate for changes in pipe length﹐Also known as expansion joint or compensator。The expansion joint is mainly used to compensate the expansion deformation of the pipeline due to temperature change﹐It is also used for pipe length compensation due to installation adjustment﹐It is mainly divided into curved expansion joints﹑Bellows expansion joint and casing expansion joint 3Species structure form。 Bent expansion joint Bend the pipe intoUShape or other form(figure1 Bent expansion joint )﹐And use the elastic deformation ability of the body to compensate for an expansion joint。It has the advantage of good strength﹑Long life﹑Can be made on site﹐The disadvantage is that it takes up a lot of space﹑Consume more steel and mo
2015-02-02 Reading quantity 2802
introduction：CCD Resolution CCD Pixels Image resolution Image Size ISO speed Sensitivity Lens performance Lens Digital zoom Digital Zoom autofocus Auto focus Manual focus Manual focus General focus range General Shooting Distance Close-up focus range Macro Shooting Distance Aperture range Aper
2015-02-02 Reading quantity 2913
introduction： ISO5199(Includes national standards equivalent to or referencing the standard，Like our countryGB/T5656)、ANSI B73.1M/B73.2MStandard alignment、Light load of oil、Centrifugal pump for chemical industry，Drive and auxiliary equipment in design、manufacture、inspect、The basic requirements of test and delivery status are put forward。 The scope and requirements of the two types of standards are basically the same，The range of applicable parameters is as follows： （1）Rated discharge pressure￡ 1.96MPa(G)； （2）Medium temperature<260℃； （3）drive
2015-02-02 Reading quantity 2922
introduction： Strength property The strength of the valve refers to the ability of the valve to withstand the pressure of the medium。Valves are mechanical products that withstand internal pressure，Therefore, it must have sufficient strength and stiffness，To ensure long-term use without rupture or deformation。 Sealing performance The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium，It is the most important technical performance indicator of the valve。There are three sealing parts of the valve：The contact between the opening and closing member and the sealing surface of the valve seat；Fitting of packing with valve stem and packing box；The connection between the valve body and the valve cover。One of the first
2015-02-02 Reading quantity 2799
introduction： nowadays，Where the car is going：Save energy、Prevent environmental degradation、Improved safety performance。As one of the important materials of automobiles，The development of automotive plastics is also aimed at these three aspects。With the deepening of research，The variety and application range of automotive plastics continue to expand。 Due to the superior characteristics of plastics，Plastic is used extensively in automotive design，It can not only realize the lightweight design of automobile structure，And it can comprehensively reflect the requirements of automobile design performance，Instant lightweight、secure、anticorrosion、Styling and comfort, etc。In addition，It also helps reduce costs，Save material resources。 Plastic on the car
2015-02-02 Reading quantity 2806
introduction：titan-based、High temperature alloy such as nickel base and high strength alloy steel and other difficult materials are widely used，It brings great difficulties to the cutting process。Due to the large amount of cutting heat generated during cutting can not be dissipated in time，Not only reduces the durability of cutting tools，Moreover, it is difficult to ensure the accuracy and surface roughness of the workpiece，Severe cases can not even cut。therefore，Reducing the cutting heat is of great significance for the machining of difficult materials。For the cutting of general materials,How to improve cutting efficiency、Extending tool life is also a problem that people have been trying to solve。Especially in heavy turning、Milling process，If the cutting efficiency can be doubled
2015-02-02 Reading quantity 2792
introduction： He Cuihong As everyone knows，A researcher before conducting scientific research in medicine，It is necessary to develop a sound statistical research design scheme，So what kind of design scheme can be called perfect？Generally speaking，Perfect design scheme needs to meet the following conditions：The manpower needed for the experiment、Material and time resources；Experimentally designed“Three elements”and“Six principles”All meet the professional and statistical requirements，Collection of experimental data、Tidy up、Analysis has a set of normative provisions and correct methods。And one of the accurate grasp of statistical research design
2015-02-02 Reading quantity 2812
introduction：The strategy of traditional manufacturing industry is economy of scale first，The 1980s put price and quality first，Since the 1990s，Has developed to market response first。At a time when manufacturing is becoming increasingly international，Shorten the product development cycle and reduce the investment risk of developing new products，Become the key to the survival of enterprises。In recent years，The manufacturing strategic focus in the manufacturing market is undergoing a major shift from cost and quality to time and response。To quickly introduce diversified products to the market is an important guarantee for manufacturers to seize the market opportunity and seek survival，Rapid response manufacturing has become the focus of international research，The emergence of rapid formation/Express system
2015-02-02 Reading quantity 2907
introduction：yingli fushi Stress corrosion stress corrosion Materials、Mechanical parts or components under static stress(Mainly tensile stress)Failure caused by the combined action of corrosion。It is often found in boiler steel、Orichalcum、High strength aluminum alloy and stainless steel，Condenser tube、Wire rope for mines、Stress corrosion caused by the inner wall of high-pressure gas cylinders used for emergency braking of aircraft is also significant。The common mechanism of stress corrosion is：Parts or components under stress and corrosive media，The oxide film on the surface is destroyed by corrosion,The damaged surface and the undamaged surface are shaped separately
2015-02-02 Reading quantity 2805
introduction：introduction Sheet material profile with small length，And slot section parts are traditionally used in special molds1sub-or2Made of sub-stamping。It can also be pressed by unit with a universal tool，however，This method is used for planar segments3Should be wide enough。In the manufacture of special die punch and die，From the nominal thickness of the material。Set out，Fit working surface。In closed position，The mold should correct the plane segment of the part，The influence of free bending of blank is excluded。The actual value of blank thickness in May be different from in。Very different values，Therefore, not all segments are subject to correction。 Such as，For high precision sheet steel，thicknessh
2015-02-02 Reading quantity 2788
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