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introduction： 601 GB/T 9074.8-1988 Cross recessed small disc head screw and spring washer and flat washer assembly Cross recessed small pan head screw,single coil spring lock washer and plain washer assemblies 602 GB/T 9074.9-1988 Cross recessed countersunk head screw and conical lock washer assembly Cross recessed coun
2015-04-07 Reading quantity 2868
introduction：For measuring sheet、strip、Tube material、sheet、Instruments for measuring mechanical quantities of coating and plating thickness。Commonly used thickness gauges are nuclear radiation thickness gauges、X Gamma ray thickness gauge、High frequency eddy current thickness gauge、Microwave thickness gauge and roller contact inductance thickness gauge。 Nuclear radiation thickness gauges are divided into two categories。One is utilizationβ、γThe thickness is measured by the intensity change caused by the absorption of isonuclear radiation when it penetrates the material under test；The other is the use of nuclear radiation backscattering principle,Radiation scatters as it passes through matter,When the scattering Angle exceeds90°Then backscattering occurs，while
2015-04-07 Reading quantity 2770
introduction： Servo system with high pressure liquid as driving source。Hydraulic servo system is a closed-loop control system composed of hydraulic power mechanism and feedback mechanism﹐Divided into mechanical hydraulic servo system and electrical hydraulic servo system(Electrohydraulic servo system for short)Two types of。among﹐Mechanical hydraulic servo system was used earlier﹐It is mainly used in aircraft rudder surface control and machine tool copying device。With the advent of electro-hydraulic servo valves﹐Electro-hydraulic servo system plays an important role in the field of automation。Many high-power fast response position controls
2015-04-07 Reading quantity 2890
introduction： Extraction of argon from feedstock gas﹑neon﹑helium﹑Krypton and xenon gas separation equipment。 Argon extraction equipment figure Working principle of argon extraction equipment Working principle of argon extraction equipment﹐How it works is﹕Argon is extracted from the argon concentration area in the middle of the upper column of the rectification column of the air separation equipment 8～12％Argon fraction﹐As feed gas﹐It is then introduced into a crude argon column for pre-separation﹐Obtained crude argon(It is roughly composed of argon96％﹐oxygen-bearing1.5％﹐nitrogenous2.5％)。The crude argon is pressurized by the argon compressor after reheating in the heat exchanger﹐The oxygen was removed by hydrogenation through a palladium catalytic converter﹔Then cooled
2015-04-07 Reading quantity 2783
introduction：Production class PCs Pieces a(The root,Block scheduling) PRS Pairs double(On an equal footing) CTN Carton Cartoon box PAL Pallet/skid pallet PO Purchasing Order Purchase order MO Manufacture Order Production order D/C Date Code Production date code ID/C Identification Code (
2015-04-07 Reading quantity 2785
introduction：Use the grinding wheel dressing tool to trim off the dull surface of the grinding wheel，The process of restoring grinding wheel cutting performance and correct geometry，Called grinding wheel dressing。When the grinding wheel is in use for a period of time，The working surface of the grinding wheel will rub against the abrasive particles of the grinding wheel during grinding、Under extrusion，Its corners are gradually rounded and blunted，Or when grinding a tough material，The abrasive chips are often impounded in the pores of the grinding wheel surface，Clog the grinding wheel surface，Finally, the grinding wheel loses the cutting ability。At this moment，There will be slippage between the grinding wheel and the workpiece，And may cause vibration and noise，The grinding efficiency is reduced，The surface roughness deteriorates。Also by
2015-04-07 Reading quantity 1397
introduction： Material selection Graphite electrode material is different from copper，By particle size，Divide into different levels。 According to the quality requirements of the mold，Material selection is key，It directly affects the speed of electrical machining，Surface roughness，Machining accuracy。therefore，According to different processing conditions，The graphite electrode material should be selected reasonably。 Electrical parameter pairEDMEffect of processing 1、Effect of pulse width The pulse width is the duration of the voltage pulse applied to both ends of the discharge gap on the electrode and the workpiece。The pulse width determines the pulse energy of a single pulse，As the pulse width increases，The amount of corrosion of the workpiece
2015-04-07 Reading quantity 2776
introduction： QCC Quality Control Circle Quality circle QIT Quality Improvement Team Quality improvement team PDCA Plan Do Check Action project Carry out Inspect Sum up ZD Zero Defect Zero defect QI Quality Improvement Quality improvement QP Quality Policy Objective policy TQM Total
2015-04-07 Reading quantity 2777
introduction： A tubular elastic sensitive component is formed by a collapsible wrinkle sheet connected along the folding and expansion direction。Its open end is fixed﹐The seal end is free﹐And the use of auxiliary coil spring or reed to increase the elasticity。When working, it extends along the length of the pipe under the action of internal pressure﹐The displacement of the active end is caused by a certain relationship with the pressure。The moving end drives the pointer to directly indicate the pressure。The bellows are often combined with a displacement sensor to form a pressure sensor with an output of electricity﹐It is also sometimes used as an isolation component。Due to the expansion of the bellows, large volume changes are required﹐Therefore, its response speed is lower than Bourdon tube。Corrugated pipe fitting
2015-04-07 Reading quantity 2877
introduction：1）Soap-based grease Soap-based grease accounts for the output of grease90％around。The most widely used。The most commonly used are calcium groups、sodium-based、Lithium - calcium - sodium -、Complex calcium base grease。Aluminum composite base、Compound lithium grease also occupies a certain proportion，These two kinds of fat are promising varieties。 （1）Calcium base grease。It is made by thickening medium viscosity petroleum lubricating oil with calcium soap produced by reaction of natural fat or synthetic fatty acid with calcium hydroxide。 Drop on75～100℃among，The operating temperature should not exceed60℃，If the temperature exceeds this，Grease can become soft or even structurally damaged and cannot guarantee lubrication。
2015-04-07 Reading quantity 2877
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