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introduction：xingsha Casting sand molding sand Materials used for molding in sand casting。Molding sand is generally made of casting sand、Molding materials such as sand binder and additives are mixed in a certain proportion，Silica sand containing natural clay can also be used。Molding sand plays an important role in foundry production，The casting waste caused by the poor quality of molding sand accounts for about the total casting waste30～50％。The usual requirements for molding sand are：①High strength and thermal stability，To withstand various external forces and high temperatures。②Good liquidity，That is, the sand intergrain phase under the action of external force or gravity
2015-01-04 Reading quantity 2801
introduction：In order to better playFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]Best-case scenario，The choice of cylindrical roller bearing grease is directly related to the stable operation of the equipment。The selection of bearing grease must be considered from the following aspects： Rust inhibitor preferably insoluble in water。Grease should have good adhesion，Be used forFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact consisting of a cage assembly with a solid window cage
2015-01-04 Reading quantity 1466
introduction：The development of Chinas mold industry has indeed made great progress today，But large、precision、The long life mold still has a big gap with the advanced level of foreign countries，In this paper, the life of the die and the related failure problems are discussed。 1.Comparison of die life between China and foreign countries Serial number Mold category Domestic level Foreign level 1 Die-casting die：Zinc-tin die casting mold Aluminum die casting mold Copper die casting mold Black metal die casting mold 20-30Ten thousand times 20Ten thousand times 1Ten thousand times 1500time 100-300Ten thousand times 100
2015-01-04 Reading quantity 2806
introduction： KOYObearing[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。]Part of the dynamic surface material falls off like a fish scale，This phenomenon is called exhaustion flaking. During the operation of the dynamic bearing，Bear a certain load，Even static loads，But for balls and raceways，The stress is cyclic，The material will suffer from dynamic fatigue
2015-01-04 Reading quantity 1570
introduction：IKOBearings if well lubricated，And correctly block debris and moisture,Indicates that the oil seal should not be worn.however,It is best to open the 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。]Box hour,Check bearings and check oil seals regularly.Check the condition of the oil seal near the universal joint bearing，To ensure that they are sufficient to prevent hot liquids or rot
2015-01-04 Reading quantity 1553
introduction：This paper analyzes the orientation of manufacturing technology based on CNC machine tools、The development of flexibility and high precision，And study its high speed、High precision、compound、New progress in five major directions: reconfigurability and networking。 enter21century，Chinas machine tool manufacturing industry is facing opportunities for the development of manufacturing equipment caused by the demand for improving the level of machinery manufacturing，Also encounterWTOAfter the pressure of fierce market competition。Technically speaking，Accelerating the flexible manufacturing technology with numerical control technology as the core will be the key to solve the sustainable development of machine tool manufacturing industry。 The number
2015-01-04 Reading quantity 2901
introduction： Part name： Die core rod Selection of material： Carbon tool steel：T10A，T12A Alloy tool steel：GCr15，Cr12，Cr12Mo，Cr12W，Cr12MoV，9CrSi，CrWMn，CrW5 High speed steel：W18Cr4V，W9Cr4V，W12Cr4V4Mo Cemented carbide：Steel bonded carbide，YG15，YG8（When the mandrel is made of carbide，It is generally welded with steel and hard alloy） Heat treatment requirement：
2015-01-04 Reading quantity 2888
introduction：FAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]Vibrating pairFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]The damage is very sensitive，exfoliation、impression、corrosion、crack、Wear and tear will be thereFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball composed of a cage assembly with a solid window cage
2015-01-04 Reading quantity 1462
introduction：Abstract：The mechanism of spheroidizing agent and spheroidizing element was discussed in this paper，The principle of composition allocation of spheroidizing agent was put forward，And combined with years of reality，The key points of quality control of nodulator in alloy production enterprises are emphasized，The evaluation index of nodulating agent quality was explained，How to select spheroidizing agent is described、And casting defects caused by improper selection，At the same time, the comprehensive measures of stabilizing spheroidization are also proposed。 Ductile iron is now produced in almost all iron mills，As an indispensable nodulator for the production of nodular cast iron, more and more attention has been paid。What kind of spheroidizing agent should be selected for different production conditions，Or what
2015-01-04 Reading quantity 2802
introduction：Driving pump、blower、Compressors and other mechanical steam turbines or power generation steam turbines closely related to industrial production processes。Industrial steam turbines can use either fuel or steam produced in boilers by by-product heat in various industrial production processes，Residual steam from the production process can also be used。Industrial steam turbines are widely used in modern industrial enterprises，The main reason is that：①At all requires both power and heat，Or in various production processes that have by-products of heat energy，Rational configuration of industrial steam turbines，Can improve energy efficiency，To achieve the purpose of energy saving。②Industrial steam turbines have a higher speed and a larger power range，Speed up to2
2015-01-04 Reading quantity 2803
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