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introduction： Measurement of the microgeometric characteristics of the machined surface of a workpiece in length metrology。The commonly used measurement methods are comparative method﹑Stylus manipulation﹑Optical cutting method and interference method。 Comparative method Compare the surface roughness samples(Short sample﹐figure1 Roughness comparison sample )Compare with the measured surface based on sight and touch﹐Determine the measured surface roughness equivalent to the value﹐Or measure its reflected light intensity change to assess the surface roughness(See laser length measurement technique)。A sample block is a set of metal blocks having a flat or cylindrical surface﹐Surface warp
2014-12-21 Reading quantity 2956
introduction： The influence of forging billet on oxide is great。therefore，The heating time cannot be extended arbitrarily，And should actively improve the heating equipment and heating methods。 The amount of oxide produced，Depends on steel grade、Furnace type and heating atmosphere。Remove the oxide on a press or hammer，The method of roughing the blank first can be adopted；And then after every blow or two，Remove the forging and blow off the oxide。This helps to reduce the wear effect of the oxide on the mold。 In addition，Hydraulic removal of the oxide、scraping、The steel wire brush is removed and the billet is used、Pre-forged groove to break up the oxide, etc，Can reduce mold wear。
2014-12-21 Reading quantity 2913
introduction：1 Test materials and methods The raw material is produced by Xingcheng Special SteelGCr15SKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，Is a leader in bearing technology and manufacturing。SKFBearings can be divided into sliding according to different specific structures and similarities and differences in working propertiesSKFBearing and rollingSKFbearing]steel。 Process route：100t EBTElectric furnace smelting-LFrefine-VDVacuum treatment-CCM300Billet warm delivery
2014-12-21 Reading quantity 1646
introduction： At present，The study of sheet metal is generally a layout、bend、Stamping and forming，There are few studies on sheet metal cost estimation。Traditional sheet metal costs are estimated on an empirical basis，And generally just focus on the cost of production。This paper presents a cost estimation method based on the whole life cycle，Artificial neural network is introduced to adjust the cost estimation results，Bring it closer to the actual cost。In this way，Get a reasonable quote quickly，Extend cost estimates to the full life cycle，It expands the avenues for profit。 one、 introduction Sheet metal because of its beautiful appearance、Light and handy、Easy processing、Low cost
2014-12-21 Reading quantity 3006
introduction：Fluid dynamics studies the flow of viscous incompressible fluids around objects、Tube flow and jet flow branch。Viscous fluids can flow in two different states：Laminar flow and turbulence。Nawi－Stokes equation is the basic equation of viscous fluid dynamics。For turbulent flow，The statistical average method is applied from this equation，We get Reynoldss equation。The dimensionless parameter that takes into account the effect of viscosity is the Reynolds number。When the Reynolds number is large，The boundary layer theory is commonly used to deal with it。The phenomenon of viscous incompressible fluid bypassing an undesirable object can be described by Karman vortex street。 Liu Mingjie
2014-12-21 Reading quantity 2898
introduction：Analyze that，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 quenching cracking of steel ball is closely related to forging and heat treatment process。Improper forging heating time or temperature control，Causing the ball to overheat or overburn，So the grain is coarse，Workpiece toughness decline。On the other hand，In the west120mmThe center part of the steel ball has small forging deformation，The cooling rate is also less，
2014-12-21 Reading quantity 1615
introduction：Rolling 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 main fault diagnosis technology is vibration diagnosis technology、Ferrography diagnostic technique、Temperature diagnostic technique、Acoustic diagnostic technique、Oil film resistance diagnostic technology and optical fiber monitoring diagnostic technology，among，Vibration、Iron shop、Temperature diagnostic technology is the most common application。 1.vibroscopy
2014-12-21 Reading quantity 1607
introduction：When determining the edge and margin，It should be based on the following principles： 1、The more complex the shape of the workpiece，The smaller the radius of the rounded corner，The value of lap edge and margin should be larger。 2、The larger the overall size of the workpiece，Its edge and edge distance should be increased with this。 3、The thicker the material，The value of the edge and the margin should also be larger。 4、The higher the mechanical strength and hardness of the material，Then the value of lap edge and margin can be reduced appropriately，When the plastic material is better，The value of the lap edge and the margin can be appropriately increased。 5、Feed and stop the material in a way that ensures accuracy，You can leave only a small width of the edge，Otherwise, it must be increased。 6、When using steel
2014-12-21 Reading quantity 2995
introduction：Forklift lifting system maintenance Technical requirements for lifting systems。The door frame should be free from cracks，There should be no influence intensity、Rigid defect，The deformation must not exceed the allowable value of the design。The door frame generally adopts the superimposed structure。The internal and external door frames should be well matched，Sliding flexibility，No blocking phenomenon。 Guide pulley frame should be installed correctly and securely。Pulley and pulley shaft shall be free of cracks and defects，The wear amount of the wheel groove shall not exceed the original design thickness10%，Suitable fit with guide pulley frame，To make the pulley rotation flexible and reliable。Chain specifications and models shall comply with design regulations。The chain plate and shaft should be free from cracks and changes
2014-12-21 Reading quantity 2896
introduction：xingbian rechuli Deformation heat treatment thermomechanical treatment Metal heat treatment process combining pressure processing and heat treatment。Thermomechanical treatment，It can achieve the dual purpose of forming and improving the microstructure at the same time，Make the workpiece to obtain excellent strength and toughness，Greatly improve the process performance and performance，Give full play to the potential of metal materials，Improve part quality and life。 The blacksmith is forging tools such as chisels and axes，The forged workpiece is immediately quenched in water，Its a deformation heat treatment
2014-12-21 Reading quantity 2883
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