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introduction： With glass﹑An optical element made of resin or metal having a surface with dense lines of equal width and distance。There are two kinds of grating: diffraction grating and metrological grating。Diffraction grating is mainly used for spectral analysis﹔Metering gratings are used for length measurement。The lines on the grating are carved into the glass or metal surface using a diamond knife or photolithography﹐It is also common to copy the already carved gratings on resin or glass and to make diffraction gratings by holography。 Diffraction grating About one per millimeter 300～1200Strip line(engrave)and1200～36
2015-01-06 Reading quantity 2839
introduction：This code applies to models and equipment productivity： machine type 227952 220076 74336 118970 57635 139694 productivity（meter3/when） 120 60 16 8 6 1、Abide by《General operating rules for casting equipment》Relevant provisions。 2、pre-work，Check screen steel or screen plate for wear，In case of severe wear，Affect production，Maintenance personnel should be notified for repair or replacement。 3、pre-work，Start with a running test，Then run empty2-3minutes，And check the transmission system（motor、coupling、retard
2015-01-06 Reading quantity 2937
introduction：Metal surface treatment includes Metal material surface treatment technology and metal heat treatment and surface heat treatment is not a type of concept。Generally, the metal surface protection and modification are called metal material surface treatment，Changing the surface structure and mechanical properties of metal materials is called metal surface heat treatment。 Content of surface protection：electroplate、coating、Chemically treated layer；Electroplating includes（galvanize、copper、chromium、lead、silver、nickel、tin、Cadmium et al）；Coating includes（Paint coating、Electrostatic dusting、Spraying process）；Chemical treatment includes（blackening、phosphating）。The other is the surface modification of metal,Also known as surface optimization,
2015-01-06 Reading quantity 1470
introduction： The process of metal cutting is the mutual movement of the tool and the workpiece、The process of interaction。The relative motion of the tool and the workpiece can be broken down into two aspects，One is the main movement，The other is the feed motion。The most important movement that makes the workpiece and the tool move relative to each other，Called dominant motion。The speed of the selected point on the blade relative to the main motion of the workpiece is called the cutting speed。The main movement is characterized by the highest speed，Maximum power consumption。There is usually only one main movement。Ensure the continuous movement of metal cutting，This is called feed motion。Per revolution or stroke of the workpiece or tool，The workpiece and tool are in feed motion
2015-01-06 Reading quantity 2801
introduction：Imported 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。]There is both friction and sliding friction。Sliding friction is due to imported bearings[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 bearing is imported under deviation and load on the surface curve[Imported bearing:simple
2015-01-06 Reading quantity 1464
introduction： 2013China（Yangzhou (in Jiangsu Province)）International cable、Materials and equipment exhibition will be held3month28day—30Held at Yangzhou International Exhibition Center，More than 100 cable companies at home and abroad were invited to Yang exhibition，Cover slave cable、Material to equipment、Accessories and many other brand manufacturers，This is the first time that the International Cable exhibition has come to Jiangsu。 Although the wire and cable industry is only a supporting industry，But occupy the Chinese electrical industry1/4The output value of，It is the second-largest industry in China after the automobile industry，Product variety satisfaction rate and domestic market share are more than90%。In the world，Chinas total output value of wire and cable has exceeded the United States
2015-01-06 Reading quantity 2796
introduction： 0introduction Electroless platingNrPThe alloy amorphous coating has high hardness，Good wear resistance and corrosion resistance，It is used more and more widely in industry，In many industries such as:Pharmaceutical machinery，Mold processing has become an irreplaceable process。However, there are often some problems in practical application due to various reasons。(1)Coating defect:Such as plating skin，Local shedding。Conventional methods require mechanical or chemical removal of the coating，Then re-plating，The binding force of the secondary plating layer is not good，In addition, the removal of the workpiece coating is time-consuming、Require a lot of work。Some parts with cavity，Local peeling，The rest of the coating is good
2015-01-06 Reading quantity 2790
introduction： The cutting speed used in the machining process﹑Process parameters such as cutting depth and feed rate﹐Also known as cutting data。As shown in the figure Cutting parameters As indicated﹐Cutting speed (meter/points)Represents the relative speed of movement between the workpiece being cut and the cutting edge﹔Depth of cutting(millimeter)Represents the amount of contact between the tool and the workpiece measured in a plane perpendicular to the cutting speed and the feed direction﹔The supply has 3Kind of representation﹕Feed per minuteV(millimeter/points)﹕Represents the amount of relative displacement between the workpiece and the tool per minute﹐&nbs
2015-01-06 Reading quantity 2800
introduction： Material grade specification Heat treatment specification property Main use P20 board （See notes） quench820-870 temper
2015-01-06 Reading quantity 2885
introduction：Reducer is a mechanical transmission device in many fields of national economy，The product categories involved in the industry include all types of gear reduction machines、Planetary gear reducer and worm reducer，A variety of special drives are also included，Acceleration device、Speed regulating device、And various types of composite transmission devices, including flexible transmission devices。Products and services are related to metallurgy、coloured、coal、Building materials、boats、Water conservancy、electricity、Engineering machinery and petrochemical industries。 Released by the Prospective Industry Research Institute《2012-2016China reducer industry production and sales demand forecast and transformation and upgrading analysis report》reveal，2008Nian State
2015-01-06 Reading quantity 2793
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