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introduction：Main content 1、The position and function of machinery in national economic construction。 2、Mechanical design personnel should have the quality。 3、“Mechanical design”Nature of curriculum、Tasks and learning methods。 4、Mechanical composition and functional structure。 5、Features of mechanical design。 Basic requirement 1、Understand the position and function of machinery in national economic construction。 2、Understand what qualities mechanical designers should have。 3、understand“Mechanical design”Nature of curriculum、Tasks and learning methods。 4、Understand the structure and function of machinery。 5、Understand the features of mechanical design。
2015-05-04 Reading quantity 1467
introduction： Classification of defects in liquid die forgings includes: 1.shape、Dimensional deviation includes：①The mold is not fully filled；②High dimensional deviation；③Low dimensional accuracy。 2.Surface defects include：①Cold partition；②Extrusion cold partition；③Surface foaming；④Surface inclusion；⑤Surface bonding with granular spills；⑥Cave in；⑦graze。 3.Internal defects include：①Air hole；②Shrinkage and porosity；③Slag inclusion and inclusion；④Extrusion segregation；⑤Abnormal segregation；③Dendrite segregation。 4.Crack inclusion：①Hot crack；②Shrinkage crack；③Cold crack。
2015-05-03 Reading quantity 2913
introduction：The usual maintenance of silver rail is not complicated，Just always do three things，oiling，rust-proof，Dust prevention。You can increase the life of the guide rail。
2015-05-03 Reading quantity 27260
introduction： 1.First lookSKFImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]The outer box，The general packaging box is white lettering、Blue background、Theres a red bar down there。But the products of the last two years have flower boxes，There are several patternsSKFtrademark。 2.Look at the production date of the bearing，If the bearing box is opened from the side，The production date and date code are on the box。 3.20
2015-05-03 Reading quantity 1562
introduction： Comparison of internal combustion vehicle and electric forklift truck 1、Counterweight gasoline forklift truck，Large volume，But its stability is good，Suitable for heavy loads,Unlimited use time，The use area is usually outdoors。Gasoline engines are small in shape,Light weight,High output power,Low noise and vibration And the price is low.But the gasoline engine overload capacity、Poor ability to work for a long time,Fuel costs are quite high.Load weight can be determined by0.5Ton to4.5Tons of。 2、Counterweight diesel forklift truck，Large volume，But its stability is good，Suitable for heavy loads,make
2015-05-03 Reading quantity 2810
introduction： The use of high-speed rotating grinding wheel and other abrasive tools to process the workpiece surface cutting。Grinding is used to process the inner and outer cylinders of various workpieces﹑Cone and plane﹐And thread﹑Gears and splines are special﹑Complex forming surface。Because of the high hardness of abrasive particles﹐Abrasive tools have self-sharpening properties﹐Grinding can be used to process a variety of materials﹐Including hardened steel﹑High strength alloy steel﹑Cemented carbide﹑glass﹑High hardness metal and non-metallic materials such as ceramics and marble。Grinding speed refers to the grinding wheel line speed﹐Generally speaking30～35meter/seconds﹐exceed45meter/Second hour
2015-05-03 Reading quantity 2813
introduction：In real life，You may have noticed that，The production level of many mold enterprises in Europe and the United States is first-class in the world，High technology on an international scale The technique is applied to the design and manufacture of molds，It has become a strong guarantee for rapid manufacturing of high-quality molds。 First of all，CAD/CAE/CAMWide application，It shows the superiority of using information technology to drive and promote mold industry。 1．In Europe and America，CAD/CAE/CAMIt has become a widely used technology in mold enterprises，inCADAspect of，Its beyond throwing off the board， The initial stage of two-dimensional drawing。At present they apply3Dproceed
2015-05-03 Reading quantity 2812
introduction：Angular contact ball 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。]Radial thrust ball bearing，Because it can be loaded with more steel balls，Its radial bearing capacity is greater than that of ordinary ball bearings，It can also withstand large axial loads or pure axial loads at the same time，The allowable working speed is similar to that of deep groove ball bearing and the bearing rigidity is stronger，But it requires precise installation，right
2015-05-03 Reading quantity 1392
introduction：KOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inKOYOBearing in the processing process，The outer ring of the bearing、Inner ring、How do the roller and cage fit together。]Conditions of use and environmental conditions Correct graspKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sized
2015-05-03 Reading quantity 1563
introduction： Abstract For CNC technology and equipment to high speed and high precision development needs，A new high precision trajectory control technique is developed。Its core content is to generate tool motion path by high frequency and high resolution sampling interpolation，Through the new Angle—The linear displacement double position closed-loop control ensures the accurate realization of the desired trajectory，The influence of mechanical error and interference on trajectory accuracy is eliminated by information trajectory correction，Thus, the controlled machine tool can be operated with high precision in the production environment for a long time。The new numerical control system has been applied in many kinds of domestic numerical control machine tools，Good results have been obtained。 descriptor：
2015-05-03 Reading quantity 2800
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