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introduction：1Effect of final rolling temperature and speed The oxidation of iron isFe——FeO——Fe3O4——Fe2O3，As the temperature rises，The oxidation rate also increases gradually。in600-800A temperature range of degrees，The resulting iron oxide is a good barrier to the diffusion of iron and oxygen atoms，Therefore, the oxidation rate does not continue to increase。When the temperature exceeds800Degree hour，The ability of iron oxide to hinder diffusion will be greatly reduced，So the rate of oxidation increases rapidly。As the temperature grows higher，Acceleration of oxidation，So in unit time，bearing[bearing:bearing（“Bearing”，Japanese person“
2015-02-18 Reading quantity 1537
introduction：daichuandong Belt drive belt drive A mechanical transmission that uses the friction between the flexible ring band and the pulley to transmit power and motion。 The type is shaped by the cross-section of the flexible belt，Belt drive can be divided into flat belt drive、Triangle belt drive and circular belt drive。Among them, flat belt drive and triangular belt drive are the most widely used，Circular belt drives are used to deliver only a small amount of power。The main features of belt drive are：Smooth transmission,Large distance between transmission centers,Low noise，Simple structure，Cushioning impact，The flexible belt breaks when overloaded
2015-02-18 Reading quantity 2785
introduction：knownCADPrograms typically constitute only a basic configuration。No doubt，Only through so-called software tools，They become more valuable，Using these software tools, the design problems of special structures can be solved easily。This also involves, for example, the development and design of plates and components。therefore，Software developerSpiNot only forAutodesk InventorAnd also forSolidWorksRespectively provide sheet metal processing applications。 This includes new instructions for design，In particular, it is used to make sharp edge models with no free position。For example, it can be used to fabricate substrates with arbitrarily closed profiles。
2015-02-18 Reading quantity 2902
introduction：one、 principle On the tip of the electrostatic gun，Connected with negative high voltage static electricity，When the voltage is high enough，The air in the area near the gun head produces a strong corona discharge，Forming gas ion regions。When the electrostatic spray gun atomized paint particles in the area，The atomized particles of the paint are negatively charged。When the coated workpiece is suspended on a grounded conveyor line，There is a positive charge on the surface of the workpiece。According to the electrostatic principle that opposite charges attract，The negatively charged paint mist particles move towards the heterogeneous working surface，It is adsorbed and deposited on the workpiece surface，Form a uniform and dense paint film，The workpiece is then painted。 two、 definition
2015-02-18 Reading quantity 2787
introduction： Cutting with a broach as a tool。When the broach moves in a straight line relative to the workpiece﹐The machining allowance of the workpiece is sequentially cut by the increasing size of the cutter teeth on the broach(figure1 Broaching process )。usual﹐It can be formed in one working stroke﹐It is a rate finishing method。But the broach structure is complicated﹐High manufacturing cost﹐And it has certain specificity﹐Therefore broaching is mainly used for mass production。According to the characteristics of the machined surface﹐Broaching is divided into internal broaching and external broaching。 ①Internal broaching﹕It is used to process various cross section shapes of through holes and through holes(figure2 Internal broaching )﹐rotundity﹑Square hole﹑multilateral
2015-02-18 Reading quantity 2787
introduction：As long as the relative humidity of the storage room does not exceed60％，Little change in temperature，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 can be stored in its original packaging for several years。Sealed bearing or bearing with dust cover，After long-term storage，The lubrication characteristics of the grease filled in the bearing may be reduced。The storage room should also be resistant to vibration and shaking。Not stored
2015-02-18 Reading quantity 1535
introduction： A tool is a tool used for cutting in mechanical manufacturing，Also known as cutting tools。Generalized cutting tools include cutting tools，Also includes abrasive tools。 The vast majority of knives are for machine use，But there are hands, too。Because the tools used in mechanical manufacturing are basically used to cut metal materials，therefore“cutter”The term is generally understood to mean metal cutting tools。The cutting tools used for cutting wood are called woodworking tools。 The development of knives plays an important role in the history of human progress。China was as early as BC28~before20century，Brass cones and copper cones have appeared、drill、The knife
2015-02-18 Reading quantity 2876
introduction：The upper silver guide rail uses the best precision design，Easy to install，With stainless steel and alloy steel two high-grade materials，Can withstand loads in all directions，Have strong rigidity，High precision characteristic
2015-02-18 Reading quantity 38493
introduction：Principles of injection mold design In the design of injection mold,In general, the following principles should be followed: 1. Choose a reasonable mold structure.Reasonable mold structure is one of the main conditions to obtain the correct size of plastic parts. 2. Side holes and side depressions of plastic parts,Mosaic core-pulling mechanism should be considered. 3. The push-rod ejector mechanism of the readers forum mold,To be launched quickly and reliably when in use. 4. The mold designed,After the parts are formed,The removal of the runner gate should be easy.In the design, try to use a latent gate or a point gate that can automatically fall off. 5. Parts molded by injection molding,Rough surface
2015-02-18 Reading quantity 2799
introduction： The shape complexity coefficient of die forging parts is divided into four stages as shown in the table Level code coefficient shape complexityⅠⅡⅢⅣS1S2S3S40.63～1.00.32～0.630.16～0.32≤0.16Simple is generally more complex than complex
2015-02-18 Reading quantity 2876
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