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introduction：As you knowhiwinHow is the linear guide rail installed？Just knowing how to install it wont do，We must pay attention to some problems during the installation process，Then there are also requirements during the installation process，Today Xiaobian tells you about this knowledge。
2015-02-05 Reading quantity 13032
introduction：one、Classification by defect manifestation The defects of forgings are distinguished according to their manifestations，Can be divided into：exterior、Internal and performance of the three External defects such as non-conforming geometry and shape。Surface crack、fold、meat-poor、Staggered error。die underforge、Surface pitting、Surface bubbles and orange peel surface, etc。Such defects appear on the outer surface of the forging Up.，Easier to spot or observe。 Internal defects can be divided into two categories: low-power defects and microscopic defects。The former is like internal fissure。Shrinkage cavity、loosen、white point、The forging rhymes are disordered、segregation、coarse-grain、Stone fracture、Heterogeneous metal inclusions, etc；The latter is like decarbonization、increase
2015-02-05 Reading quantity 1567
introduction： one.Causes of black bars： 1Thermal decomposition of materials 2Injection molding machine screw damage 3The material carbonizes due to friction and compression of air two.Related knowledge 1The most common black strip is caused by the residual residue of material decomposition and then injected into the cylinder of the plastic machine。 2In a plunger injection molding machine，Residue that tends to remain in all parts。 3Injection molding machine with valve control nozzle，Residue is also easy to remain in the valve control part。 4In the barrel the air is compressed to a high temperature，this
2015-02-05 Reading quantity 2923
introduction：Cylindrical roller bearings[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。]Because of the gap，Under load，The inner and outer rings will move relative to each other，This will reduce the stiffness of the cylindrical roller bearing，Causes radial and axial vibration of the shaft，The working accuracy and life of the machine are affected。To reduce this vibration，For high precision and high speed machinery
2015-02-05 Reading quantity 1587
introduction：1、Butt 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。]Quality requirements for steel。The rolling bearing should be stretched、compress、curvature、shear、Alternating such complex stress states and under high stress values，High speed、Work long hours。So in the production process，Bearing steel quality control inspection items，The control is narrow，Strict production process、complexity
2015-02-05 Reading quantity 1608
introduction：Resistance furnace The electric heating element or heating medium in the furnace is heated by electric current﹐An industrial furnace for heating workpieces or materials。Resistance furnaces are used in the mechanical industry to heat metal before forging﹑Metal heat treatment heating﹑soldering﹑Powder metallurgy sintering﹑Glass and ceramic roasting and annealing﹑Low melting point metals melt﹑Sand and paint film drying, etc。 Since the discovery of the thermal effect of electric current(Silenc-Joules law)later﹐The electric heating method was first used for household appliances﹐Later, it was used in small electric laboratory stoves。With the invention of nickel-chromium alloy﹐to20century20age﹐Resistance furnaces have been widely used in industry。Industrial resistance furnace one
2015-02-05 Reading quantity 2819
introduction：The properties of metal materials can be divided into service properties and process properties（Also known as processing properties）。 Performance includes：1、Physical property（Specific gravity、Fusing point、Electrical conductivity、Thermal conductivity、Thermal expansibility、Magnetic scheduling）；2、Chemical property（Corrosion resistance、Oxidation resistance, etc）；3、Mechanical or mechanical properties（intensity、plasticity、hardness、toughness、Fatigue strength）。 Process performance（processability）：1、Casting property；2、Forging property；3、weldability；4、machinability；5、bend；6、Heat treatment performance。 1、Specific gravity：Specific gravity is a thing
2015-02-05 Reading quantity 2790
introduction：reliuji Heat flow meter heat-flow meter An instrument that measures the heat flux of an object that dissipates or absorbs heat。The most common of these instruments is the conduction heat flow meter，There is also a total heat flux meter for measuring the total heat flux of both convective heat transfer and radiant heat transfer in the boiler furnace，And a radiometric heat flux meter that only measures the radiant heat flux density，They are all special instruments for measuring heat transfer in the furnace. The operation of the heat transfer meter is based on the principle of heat transfer:The heat flux of a plate in unit time ，The thermal conductivity with the plate material and the temperature difference between the two sides of the plateΔIn direct proportion to，And the thickness of the plate
2015-02-05 Reading quantity 2810
introduction：The annealing treatment of plastic products refers to the uneven plasticization of plastic in the cylinder or the uneven cooling rate of the product in the mold cavity, which causes the existence of internal stress of the product leading to deformation of the product in the future.cracking.Aging and other reasons。Annealing is done on the product indoors，Use a hot liquid medium such as hot water，Hot mineral oil，Hot glycerin and other liquids，Heat to a temperature higher than that of the product20-35Or lower than the thermal deformation temperature of the product25-35Degrees in temperature，Put the product in，The length of annealing time depends on the wall thickness of the product，Thicker walls take longer to anneal。Need to pay attention to，The annealed product should be smoothed out after taking out the hot liquid and leaving it natural
2015-02-05 Reading quantity 2810
introduction：Heat exchangers with heat transfer components made of graphite。The graphite used to make heat exchangers should be impervious﹐Commonly used impregnated impervious graphite and pressed impervious graphite。Graphite heat exchanger according to its structure can be divided into block hole type﹑Shell type and plate type3Species type。 Block hole type﹕It is composed of a number of blocky graphite components with holes(See picture Block hole type graphite heat exchanger )。 Shell and tube type﹕Shell-and-tube heat exchanger plays an important role in graphite heat exchanger﹐According to the structure is divided into fixed and floating head type two。 plate-type﹕Plate heat exchanger is made of graphite plate bonded。In addition﹐And immersive﹑Spray type and sleeve type, etc(See coil heat exchanger﹑Bushing type
2015-02-05 Reading quantity 2794
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