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introduction：【pick to】This article describes the usePTCcorporatePro/ENGINEER 2001、Pro/INTRALINKsoftware，The design process of space rocket engine for a space launch vehicle is completed by using top-down parallel design，The steps and advantages of this design method are also introduced。 【keyword】Design method Design procedure advantage 1 introduction
2015-03-26 Reading quantity 2878
introduction：Mass transfer through permeable gas film on porous wall。Divergent cooling is a cooling technique that prevents the surface of a solid wall from being damaged by high temperature airflow，Its a kind of mass transfer cooling。The coolant at a lower temperature permeates through porous solid walls that require thermal protection at a certain pressure，A continuous cooling layer is formed on the heating surface close to the solid wall(See picture[Divergent cooling diagram])。Coolant passes through porous solid walls，Because the total internal surface area of the solid wall pores is very large，Enhanced heat transfer，The coolant is able to remove a lot of heat from the solid walls。The cooling gas film formed after seepage from the solid wall plays the role of heat insulation to separate the high temperature air flow from the wall surface，the
2015-03-26 Reading quantity 2776
introduction：pneumatically、electricity、Principles such as optics and the photoelectric effect convert the measured length into the pressure or flow of air、Physical quantities such as electricity and light intensity，A measuring element to obtain measurement information，Used in some length measuring tools。Length sensor（Hereinafter referred to as sensor）It is mainly composed of sensing element and conversion element。The conversion element precisely converts the measured length sensed by the sensing element into other physical quantities that are convenient for amplification and processing。 The pneumatic sensor converts the measured length into air pressure and flow rate，Used as a relative measurement（See Length measurement techniques）Sensor of。Its feature is that it can be used
2015-03-26 Reading quantity 2783
introduction： The new mold packaging generally includes the following items，Please check that the contents of the package are the same as described below，Please make sure the following items are in the package。If any item is missing or damaged，Please contact us。Usually included in the package： 1）mould1vice； 2) Inspection record1Copy of the； 3) Certificate of conformity1zhang； 4) Test shot1zhang； 5) Rotor die with spare punch4only；Stator punching die with spare punch２only；
2015-03-26 Reading quantity 2869
introduction：According to the optical plastic product map，It is necessary to ensure that the optical properties of the parallel beam from the light source can meet the requirements of the specified diffusion and refraction when it passes through the medium，And to meet the production process conditions of molded parts，Then consider determining the mold structure，The structure of two plates, one mode and multiple holes is usually adopted。Due to the high requirements of surface roughness grade of molded parts，Therefore, all adopt the embedded structure，Easy to single processing and disassembly replacement，The guide mechanism is all designed with nested structure，Easy to replace after wear without reducing the original assembly accuracy and motion accuracy，The ejector part uses a guide prop，Reduce ejector rod wear，Avoid spillage，And can extend the life of the ejector rod，Moving die
2015-03-26 Reading quantity 2780
introduction：Abstract For a long time，Biodegradable organic matter especially assimilable organic carbon in drinking water（AOC），It is considered to be a limiting factor causing bacterial regeneration in the water supply network。Research findings in recent years，In addition to biodegradable organic matter，Phosphorus sources also become a limiting factor for bacterial regeneration in the water supply network，This discovery changes the traditional view that biodegradable organic matter is the only limiting factor in the biostability of drinking water。In view of our country water source is polluted、Current situation of high organic content in source water and drinking water，Effectively removing phosphorus from water is a new way to improve the biological stability of drinking water，also
2015-03-26 Reading quantity 2880
introduction：Numerical control machine tool is the product of the combination of information technology and mechanical manufacturing technology，It represents the technical level and development trend of modern basic machinery。In recent years，Numerical control machine in China The bed industry is developing rapidly，At present, there are nearly 100 CNC machine tool manufacturers。In order to speed up the development of Chinas CNC machine tool industry，To better meet the needs of national economic development ，State Planning Commission、The Ministry of Machinery Industry is formulating and issuing《Outline for the revitalization of machinery industry》China has listed important basic machinery as one of the four key areas of revitalization，The important basic machinery is mainly the development of CNC machine tools。“The ninth Five-Year Plan”and2010Years ago, Chinas CNC machine tool development policy is：heavy
2015-03-26 Reading quantity 2778
introduction：1. The type of lubricating oil or grease is not chosen correctly； 2. underlubrication（Low oil level，Oil or grease leaks through the seal）； 3. 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。]The clearance is too small（Mixed concentration
2015-03-26 Reading quantity 1423
introduction：Injection molding is an engineering technology，It is concerned with transforming plastics into useful products that retain their original properties。An important process condition for injection molding is the temperature that affects the plasticizing flow and cooling，Pressure and corresponding time of each action。 one、Temperature control 1、Barrel temperature：The temperature that needs to be controlled during the injection molding process is the temperature of the barrel，Nozzle temperature and mold temperature, etc。The temperature of the first two processes mainly affects the plasticization and flow of plastics，The latter temperature mainly affects the flow and cooling of plastics。Each type of plastic has a different flow temperature，Same kind of plastic，Due to different sources or brands，Its flow temperature and minute
2015-03-26 Reading quantity 2868
introduction：In recent years, our country vigorously promoted the development mode of energy saving，In terms of the current gear reducer market，Due to the low industry threshold，The quality of some small enterprises products has not improved，Dragging down the development of the entire industry，The transformation pressure of the industry has increased。Therefore, General Motors believes that steady progress at this stage is the key to the healthy development of the gear reducer industry。 As a gear reducer widely used in speed and torque conversion equipment，The development in recent years has made a new breakthrough。With the improvement of science and technology，Optimized stock、Control capacity、Energy saving has become the key to promoting industry transformation point。And the near stage state release
2015-03-26 Reading quantity 2799
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