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introduction：1、When using the injection molding process to produce products，Due to the non-uniform cooling and non-uniform shrinkage of the plastic in the mold cavity and the product knot The structure design is unreasonable，It is easy to cause various defects of the product： Reprint in a reduced form、Weld mark、Air hole、Amorphosis、napping、Tip wound、flash。 2、To get high quality injection molding products，We must take structural manufacturability into account when designing products，undercombination The main structural characteristics of injection molding products are analyzed to avoid injection molding defects。 2.1Opening direction and parting line Each injection molding product must first determine its opening direction and parting line at the beginning of the design，To guarantee
2015-03-24 Reading quantity 2783
introduction：jixie zengyi Mechanical gain mechanical advantage The ratio of load to driving force in a machine，It represents the degree of mechanical enhancement。The lever is the simplest labor-saving device(See picture[Mechanical gain diagram])，Is the fulcrum，PRepresents the force acting on a point,WIts a load on a point。When the lever is in equilibrium，If friction is not considered, it can be obtained according to the torque balance relationship Mechanical gain=W/P=/evident，The smaller the distance between the point and the fulcrum, the less labor. Using this principle, many lifting equipment can be made,The winch is one of them。And a half
2015-03-24 Reading quantity 2784
introduction： The drivetrain is located between the engine and the drive wheels，It can make the power characteristics of the engine output suitable for the needs of the car in various working conditions，Make the car run properly。The most common is a mechanical drive train，Hydraulic mechanical transmission systems are used in large buses、Luxury cars and all kinds of engineering vehicles。Electric transmission is rare，Only used on large mining vehicles。 Mechanical drive train 1、Composed mainly by the clutch、transmission、The universal transmission device and the drive axle are composed、In an off-road vehicle，Transfer case is also provided。Responsible for distributing the power of the transmission back to the drive axle。
2015-03-24 Reading quantity 2790
introduction：With an eccentric lock ringY-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。]It is mainly suitable for applications where the rotation direction is inconvenient to fix。On one side of the bearing inner ring，Theres an eccentric extension，Fit with locking ring。Turn the locking ring on the inner ring extension in the direction of rotation，Lock the collar and bearing onto the shaft。And use a crew cut（immobilization
2015-03-24 Reading quantity 1435
introduction：concept：Nitriding is the process of infiltration of nitrogen atoms into the surface layer of steel，Its purpose is to improve the surface hardness and wear resistance，As well as improve fatigue strength and corrosion resistance。It uses ammonia gas to break down reactive nitrogen atoms when heated，After being absorbed by steel, a nitriding layer is formed on its surface，At the same time, it spreads to the center。 Nitriding is usually carried out using specialized equipment or well carburizing furnaces suitable for a variety of high-speed transmission precision gears、Machine tool spindle（Such as boring bar、Grinder owner），High speed diesel engine crankshaft、Valve etc。 Nitrogen chemical process route：forge－anneal－Rough finish－tempering－finishing－de-stress－Rough grinding－nitriding－fine
2015-03-24 Reading quantity 2781
introduction： In the grinding process，Due to abrasion of the grinding wheel itself，Constantly changing the state of the working surface of the grinding wheel。With the extension of grinding time，The cutting ability of the grinding wheel decreases，Various grinding defects continue to appear，The grinding process can not continue。now，Must trim the wheel，Return to normal grinding state。The actual grinding time of the grinding wheel between two dressing sessions is called the life of the grinding wheel。The life of grinding wheel is an important factor affecting the grinding effect，It is especially important for molding grinding。 Judging grinding wheel life It is generally based on various phenomena caused by the wear of the grinding wheel working face
2015-03-24 Reading quantity 2790
introduction： 1. GCr15bearing[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 role of silicon in steel It is beneficial to the formation of ferrite structure of body-centered cube，No carbides are formed in steel，Its to the left of iron in the periodic table，It is mainly soluble in iron。It has little effect on the diffusion coefficient of carbon in austenite，The rate of austenite formation
2015-03-24 Reading quantity 1549
introduction：The printing of commodity bar codes is mainly involved、Printing equipment、Printing location, etc，These three also affect the effect of packaging anti-counterfeiting。Consider from the anti-counterfeiting packaging，We can divide the printing location into on-site printing。 Bar code off-site printing operations are mainly carried out in professional printing plants，It is mainly supplied to enterprises in the form of trademarks or packaging boxes。Generally speaking, this printing method has low cost，The quality of printing is reliably guaranteed，The use of enterprises do not need to master the corresponding printing technology，These advantages have a strong attraction，Most companies are happy to adopt it，However, the anti-counterfeiting effect of this printing method is generally poor，
2015-03-24 Reading quantity 2875
introduction： 1． Radius This standard specifies the content of the grinding performance test method of emery cloth sandpaper：Test apparatus，Test condition，Sample preparation，Test procedures and treatment of test results。 This standard applies to emery cloth，River sandpaper water resistant sandpaper。 2． Test apparatus 2.1 Abrasive paper grinding performance tester a)Grinding performance tester grinding disc end runout is not greater than0.05mm；
2015-03-24 Reading quantity 2800
introduction： With high hardness﹑Tool steels with high wear and heat resistance﹐Also known as high-speed tool steel or front steel。High-speed steel is the Taylor of the United States﹐F.W.andM.Whitehoe1898It was created in 2000。High speed steel has good technological properties﹐Good match of strength and toughness﹐Therefore, it is mainly used to manufacture complex thin-edged and impact-resistant metal cutting tools﹐High temperature bearings can also be manufactured[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is fixed in the mechanical transmission process
2015-03-24 Reading quantity 2793
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