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introduction：rubian shiyan Creep test creep test The metal material is measured under constant temperature and constant stress for a long time，A test of the mechanical properties of a material in which slow plastic deformation occurs。The higher the temperature or the greater the stress，The more significant the creep phenomenon。Creep can occur under a single stress（tension、Pressure or torque），It can also occur under combined stress。The usual creep tests are carried out under unidirectional tensile conditions。 The creep limit is the maximum constant stress when the creep deformation or creep velocity of the sample does not exceed the specified value at a specified temperature and a specified time。There are two kinds of it
2015-03-07 Reading quantity 2822
introduction：1。The electrode should be preheated，The composition of the electrode should be the same or close to the composition of the die steel，To ensure uniform structure after welding 2。The mold should be preheated above martensitic temperature，But not too high.。 3。The current should be controlled small，Otherwise, the welding depth is too large。 4。The mold should be kept preheated during welding。 5。When necessary，Heat treatment after welding。
2015-03-07 Reading quantity 2826
introduction：Four row tapered 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。]The match between the inner ring and the roll neck is generally with a gap，Install the bearing into the bearing box first，Then load the bearing box into the journal。 Four row tapered roller bearing outer ring and bearing box hole also adopt dynamic fit，Put the outer ring firstALoad bearing box。Factory in the outer ring、Inner circle and inside
2015-03-07 Reading quantity 1481
introduction： Working principle This type of equipment has no circulating air ducts outside，Hot air circulates inside the device，Circulation mode according to the different materials have a series cycle、Convective circulation、Independent cycle, etc。Because of the emphasis on specificity，Determine the air volume according to the special drying requirements of the material、temperature、Relative humidity、Operating speed and other technical parameters，Functional indicators of equipment such as production capacity、Product quality、Energy consumption、Reliability and other key indicators and noise，Insulation performance、The auxiliary function indexes such as ease of operation have been improved。
2015-03-07 Reading quantity 2841
introduction：1，Accept the assignment The task sheet for molding plastic parts is usually proposed by the part designer，Its contents are as follows： Approved positive regulation drawings，And indicate the use of plastic brand、Transparency etc。 Specifications or technical requirements for plastic parts。 Production output。 Samples of plastic parts。 Usually the mold design task book is put forward by the plastic parts technician according to the task book of the molded plastic parts，Mold designer to form plastic parts assignment、Mold design task book as the basis to design the mold。 2，Collect、analyze、Digest primary data closed
2015-03-07 Reading quantity 2811
introduction：In a corrosive environment，The destruction of metal and surrounding medium due to chemical or electrochemical interaction is called corrosion。In a corrosive environment，When stainless steel is not chosen，It also causes corrosion。Corrosion can be classified in many ways。 1、According to the nature of the action can be divided into chemical corrosion and electrochemical corrosion。 2、According to the form of corrosion can be divided into general（comprehensive，evenness）corrosion。So-called general corrosion，Corrosion is distributed throughout the stainless steel surface，So-called local corrosion pitting，Crevice corrosion，Stress corrosion，Corrosion fatigue，Selective corrosion，Scour corrosion。 3、accretion
2015-03-07 Reading quantity 2913
introduction： Diesel engine has high thermal efficiency﹑Good economy﹑Easy starting﹑It has great adaptability to all kinds of ships﹐Soon after its introduction, it was used as a propulsion power for ships。to20century50age﹐In newly built ships﹐Diesel engines have almost completely replaced steam engines。Marine diesel engines have been civilian ships﹑The main power of small and medium-sized ships and conventional submarines(See Marine power plant)。Marine diesel engine can be divided into main engine and auxiliary engine according to its role in the ship。The main engine is used as the propulsion power of the ship﹐The auxiliary engine is used to drive the generator﹑Air compressor or water
2015-03-06 Reading quantity 2802
introduction：Applicable model：ПO-6，W58-16，W58-6.3，W51-63，4544。 one、 Conscientiously implement《General operating rules for forging equipment》Relevant provisions。 two、Conscientiously implement the following supplementary provisions： Conscientious at work： 1、Steel head bending，Cant send in time，Stop immediately to remove，It shall not be allowed to pass。 2、When the steel is found to be screwed in，Magnetic therapy is shut down to remove，It shall not be allowed to pass。 3、When the steel is straightened if it is a plate material，Should always pay attention to the work of the tray rack，Stop the machine immediately if you find any confusion。Plate material processing to fast
2015-03-06 Reading quantity 2895
introduction：Universal high speed steel grade (Abbreviated code)Chemical compositionC(carbon)W(tungsten)Mo(molybdenum)Cr(chromium)V(vanadium)Si(silicon)Mn(manganese)S(sulfur)P(phosphorus)REW18Cr4V (18-4-1)0.70～0.8017.5～19.0≤0.303.80～4.401.00～1.400.20～0.400.10～0.40≤0.030≤0.030-W9Mo3Cr4V (9-3-4-1)0.77～0.878.50～9.502.70～3.303.
2015-03-06 Reading quantity 2929
introduction： Concentration is a special index of superhard abrasives，It refers to the quality of the superhard abrasive contained in each cubic centimeter volume of the working layer of the superhard abrasive。International requirements per unit volume0.88G Super hard abrasive，Its concentration is100%。Every increase or decrease in content0.22G ，Its concentration increases or decreases accordingly25%。Concentration is one of the important characteristics of superhard abrasives，It has a significant impact on the grinding efficiency of the grinding tool and the processing cost of the process。overconcentration，Many abrasives fall off prematurely，Lead to waste of abrasive；hypoconcentration，Grinding efficiency decline，Can not meet the processing requirements。
2015-03-06 Reading quantity 2798
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