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introduction：The function of linear guide is to support and guide moving parts，Reciprocating straight motion in the given direction。It depends on the frictional nature，Linear motion guides can be divided into sliding friction guides、Rolling friction guide、Elastic friction guide、Fluid friction guide and other types。
2014-12-12 Reading quantity 27134
introduction：Turntable 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。]It is able to withstand a large axial load at the same time、Medium and large bearings of special structures with combined loads such as radial load and overturning moment[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is the part that fixes and reduces the friction coefficient of load in the process of mechanical transmission
2014-12-12 Reading quantity 1745
introduction：The basis for choosing a fit According to action on 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。]The load on it is relative to the rotation of the ring，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
2014-12-12 Reading quantity 1689
introduction：At present，Plastic products are increasingly used in daily life，Among them, injection molding technology accounts for about80。Injection molding for one molding、Accurate size、Inserts are available、High productivity、Easy to modernize、The characteristics of low post-processing amount are widely used in automobiles、unit、Household appliance、food、Medicine and many other fields。Selection of plastic mold，It is very critical for the plastics industry to receive good economic benefits，therefore，It is necessary for mold designers to understand the basic requirements of mold materials and select appropriate materials。 The working conditions of plastic molds are different from those of cold dies，Generally required150℃-200℃Under the
2014-12-12 Reading quantity 2992
introduction：1 Mechanical polishing Mechanical polishing is by cutting、The plastic deformation of the surface of the material removes the convex part after being polished to obtain a smooth surface polishing method，Generally, whitestone strips are used、Wool wheel、sandpaper，Mainly manual operation，Special parts such as rotary surfaces，Auxiliary tools such as turntables can be used，Surface quality The method of super finishing polishing can be used for high requirements。Super finishing is the use of special grinding tools，In a polishing solution containing abrasives，Press firmly on the surface of the workpiece to be machined，Perform high-speed rotating motion。Using this technology can be achievedRa0.008μmSurface roughness of，It is the highest of various polishing methods。Optical lens mold is often used
2014-12-12 Reading quantity 1618
introduction： Chinas economy is growing fast、yi、A good run of low inflation。The national economy grew better than expected in the first half of this year，This year1~6monthGDPincrease7.8%。Acceleration of industrial growth，The value added increased year-on-year11.7%。Chinas economy is still the fastest-growing in the world。It is expected that the national economic policies will continue to be implemented in the second half of the year，The overall economic situation of the country will remain in good condition，annualGDPGrowth should be in7.5%above。 Investment in fixed assets grew strongly。Total fixed asset investment in the first half of the year1.4Trillion yuan，Year-on-year growth21.5%，Same as last year
2014-12-12 Reading quantity 3012
introduction：Balancing valves belong to the category of regulating valves，It works by changing the gap between the spool and the seat（Immediate opening），Change the resistance of the fluid flowing through the valve，To achieve the purpose of regulating flow。The balance valve is equivalent to a throttling element whose local resistance can be changed，For incompressible fluids，It can be obtained by the flow equation： Shizhong：Q--Flow through the balance valveξ--Resistance coefficient of the balance valveP1--Pre-valve pressure P2--Behind valve pressure&n
2014-12-12 Reading quantity 2986
introduction： Subtract the bearing from the theoretical clearance[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。]When installed on the shaft or in the housing, the amount of expansion of the ring caused by interference fit or the gap after contraction is called“Installation clearance”。 Add a factor bearing to the mounting clearance[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）is
2014-12-12 Reading quantity 1739
introduction：During heat treatment，To accurately measure and control the temperature of the workpiece and the cooling medium，Demand test、Temperature controller The thermometer is used to measure and control temperature。 1．Liquid glass thermometer Glass liquid thermometers are based on liquid media（Hydragenum、Alcohol、toluene）The temperature is measured by the principle of thermal expansion in the glass tube，The measured temperature range is：-100℃～800℃。Glass liquid thermometers are characterized by an in situ indication，Accurate and convenient，Live contacts can also be equipped with relays for signaling or control。 2．Thermocouple and millivoltmeter A thermocouple consists of two wire or alloy wires of different compositions，Weld one end and insert
2014-12-12 Reading quantity 1760
introduction： Angular contact ball 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。]It can withstand both axial and radial forces in one direction。The line above and below the force point of the rolling body，It has a certain Angle to the radial direction。Such bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is fixed in the mechanical transmission process
2014-12-12 Reading quantity 1733
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