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introduction： Measurement of thread parameters in length measurement techniques。There are two methods of thread measurement: single measurement and comprehensive measurement。 Single measurement It is often used to measure the middle diameter of the thread﹑Parameters such as pitch and tooth half Angle。 Middle diameter measurement Commonly used cylindrical thread diameter measurement methods are﹕Measure with thread micrometer。the3Two cylinders of the same diameter──Three kinds of needles﹐Place in the thread groove(figure1 Measure the middle diameter by the three-pin method )﹐Then use a micrometer according to the accuracy requirements﹑Comparator or length measuring instrument(See length measuring machine)Measured value﹐compute
2015-03-26 Reading quantity 2790
introduction：one、Nature and classification of pressure processing 1.Definition of pressure machining Pressure machining is the use of metal plasticity，Under the action of external force, the metal billet produces plastic deformation in the expected direction，To get the desired shape、Methods of size and mechanical properties。 2.Characteristics of pressure processing Metal has good mechanical properties、High productivity、Economize metal，But the equipment is more expensive，The precision finish of the forging is not high enough。 3.Application of pressure processing Its in the metal industry、National defense industry、It is used in civil industry
2015-03-26 Reading quantity 2802
introduction：In the mechanical assembly process,The transfer of materials and assembly operations of base parts and assemblies may be partially or completely semi-automated or automated。The main purpose of mechanical assembly automation is：Ensure product quality and stability，Improve working conditions，Increase labor productivity，Reduce production costs。General requirements for assembly automation are：The production batch of the product is large；The automatic assembly process of product structure is good，If the assembly work has good separability，Easy part orientation、orientation，The connection between parts is often bonded and welded instead of threaded connection，Avoid using spacers and other adjusting parts；The use of automatic assembly should have a better economic effect
2015-03-26 Reading quantity 2787
introduction：This noise, though, is essentially caused by manufacturing errors，But actually still with the choice of lubricant、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。]Installation conditions、The shaft is related to the precision state of the bearing seat。This noise is divided into cage sound and vibration sound two types，It is described as follows： (1)Cage sound and its control method
2015-03-26 Reading quantity 1465
introduction：one、Pay attention to the brand of the second phone。Buy a used press，First of all, we must produce offset presses in the printing quality of the worlds companies、Good understanding of equipment performance and stability，Thats the basic premise。If the use of the new equipment is not long, ink bars or overprinting is not allowed to such or such printing failures，This type of machine cannot be included in the scope of purchase。 two、Find out the country or region where the second phone was originally used。This is one of the factors that determine the quality and price of the second phone。Same brand、Model number、Machines produced at the same time，Due to the technical quality of users using the machine、Maintenance level and workload of equipment
2015-03-26 Reading quantity 2808
introduction： Background of air source heat pump Tianjin air source heat pump foreground background。The first background is heating，The cooperation of Tianjin this year2008Olympic Games，Cooperate with blue Sky engineering，No more coal-fired boilers are allowed to be built inside the outer ring road；The second is that coal-fired boiler rooms with a capacity of less than ten tons within the outer ring line will gradually be demolished，Whats left inside the outer loop、Boiler room mainly burning coal，That is, the existing heating resources of the city，I am afraid that the recent two or three years can only meet the needs of new housing，That is to say, in the future, there are only two winter heating options for such public buildings：
2015-03-26 Reading quantity 2949
introduction：3D laser cutting has been used in automotive manufacturing、Aerospace and other fields are increasingly widely used。Today, 3D laser cutting processing is in the development of new products in automobiles，It has replaced the trimming die and punching die of the automobile covering parts，Becoming a car manufacturer shortens the development cycle、Reduce cost、A powerful tool for competitiveness。Perform 3D laser trimming，It is necessary to ensure that the laser beam moves along the edge of the workpiece，At the same time to ensure that the laser incidence direction and the workpiece surface perpendicular，It also requires the laser head to constantly adjust its posture。To realize 3D laser cutting automatic programming，It is necessary to automatically generate the boundary contour of the 3D workpiece and the normal of the contour line，
2015-03-26 Reading quantity 2963
introduction： (1)Design element Industrial modeling design is a new interdisciplinary subject，A multidisciplinary design method must be adopted，In order to obtain the optimal state solution of various components，Thats the ideal design。The factors that have a direct impact on industrial modeling design include people、Technical conditions and environmental aspects。 (2)Design program Modern industrial modeling design is purposeful and planned in order to develop，The whole design process sometimes intersects with each other，Sometimes there are cycles。The cycle is to constantly check whether each step of the work meets the requirements of the design。Industrial manufacturing
2015-03-26 Reading quantity 3007
introduction： one.intro: YPGSeries spray dryer is under the pressure of high pressure pump,The material is atomized into small droplets by pressure nozzle,Rapid heat exchange with large surface area and high temperature hot air,Instantly complete the evaporation of water,Drying time is only a few seconds. two..peculiarity: 1.Fast drying speed,Due to the material liquid atomization surface area greatly increased,Drying is done in a very short time. 2.Suitable for drying heat sensitive materials.Because the drying process is instantaneous drying process,And droplets and hot air&nbs
2015-03-26 Reading quantity 2832
introduction：1．At present, there are many companies abroad to promoteSMSequipment，But the price difference is huge。Price is an important consideration when purchasing equipment，But at the same time considering the price，The more important point is to consider the performance of the device。SMSThe reason why it is popular in the market is mainly in the performance of the general spunbonded cloth can not replace the function。Such as：SMSCapable of certain hydrostatic pressure，It shields urine and blood to some extent。therefore，When considering the model choice，We have to consider the price，Performance is more important。 2．Attention should be paid to the melt-blown layer：inSMSIn the，MRepresents the melt-blown layer。The melt-blown layer is very important to withstand hydrostatic pressure
2015-03-26 Reading quantity 2953
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