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introduction： Standard number Standard Chinese name Standard English name BS EN 13953-2003 Liquefied petroleum gas(LPG)A removable pressure relief valve for filling storage cylinders (Pressure relief valves for transpor
2015-03-02 Reading quantity 2883
introduction： Rapid prototyping is discrete／Pile forming。It puts forward a new dimensional model of thinking mode from the forming principle，That is, a three-dimensional model of a part made on a computer，Grid processing and storage，It is processed in layers，The two-dimensional profile information of each section is obtained，According to these contour information, the machining path is automatically generated，By the forming head under the control of the control system，Selectively curing or cutting layers of forming material，Form each section outline thin slice，And step by step sequence superimposed into a three-dimensional blank．Then the billet is post-processed，Forming part。 The process of rapid prototyping is as follows
2015-03-02 Reading quantity 2885
introduction：activator activator bag moulding The air tire is pressed into shape bonding strength Bond strength breathing venting caulking compound Interstitial material cell Air hole cold slug Semi-coagulated injection colorant Coloring agent color matching Colour mixing color masterbatch Color masterbatch compound admixture copolymer
2015-03-02 Reading quantity 2804
introduction：Reducer maintenance regulations 1．General rules 1．1Scope of application： This specification applies to horizontal type in this branch、Maintenance and overhaul of vertical planetary cycloidal pinwheel reducer。 1．2structure：The planetary cycloidal pinwheel reducer is mainly composed of an output shaft、Input shaft、Engine bed、Gear pin、Pin sleeve、Cycloidal gear、Spacer ring、Retaining ring、Pin-tooth housing、Pin bush、pin、Eccentric sleeve、Motor and other parts of the composition。 1．3Working principle：Cycloidal pin gear reducer is one of the usesK-H-VNovel transmission device of planetary transmission principle with small tooth difference。The transmission process is as follows:There is a misalignment in the input shaft180°Double eccentricity
2015-03-02 Reading quantity 2789
introduction： The science of mechanical phenomena in the operation of internal combustion engines。Its main task is to study and analyze the motion laws and stress conditions of the main parts of the internal combustion engine during operation，Designed as an internal combustion engine component、Basis of calculation。It also studies the effects of these forces on the internal combustion engine power plant and its reduction methods。The main content of internal combustion engine dynamics is kinematics of crank and connecting rod mechanism、Analysis of crank linkage mechanism dynamics and internal combustion engine balance。 Crank linkage mechanism kinematics study crank、Connecting rod，Especially the movement of the piston。
2015-03-02 Reading quantity 2883
introduction： We usually call the high voltage frequency converter，It is usually called medium voltage inverter abroad(Medium Voltage Drive),Its the same thing，There is a habit issue here。 The corresponding load motor voltage level is generally2.3kV-13.8kV,According to our country6kV,10kVGive priority to，And a small amount of3kVLv.。The West considers this voltage range relative to the high voltage of the transmission grid，for“Medium voltage
2015-03-02 Reading quantity 2895
introduction：Wall temperature at work-20℃Below the pressure vessel。Liquefied ethylene﹑Liquefied natural gas﹑The containers used for storage and transportation of liquid nitrogen and liquid hydrogen are low-temperature pressure vessels。Ferritic steel commonly used in pressure vessels is used when the temperature is reduced to a certain temperature﹐The toughness of steel will decline sharply﹐Its very brittle﹐This temperature is often referred to as the brittle transition temperature。When the pressure vessel is used below the transition temperature﹐If there is a defect in the container﹑Residual stress﹑High local stress caused by stress concentration and other factors﹐The vessel may suffer a brittle rupture without significant plastic deformation, resulting in a catastrophic accident。For low temperature pressure
2015-03-02 Reading quantity 2773
introduction：For removing down 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。]Be careful to overhaul and clean，Check carefullyIKObearing[IKObearing:IKONeedle roller bearing with its special internal structure to achieve the mechanical design of small、Light weight。Guideway bearings are based on the high quality given by needle roller bearings，With unique machinery
2015-03-02 Reading quantity 1539
introduction：Virtual product development(VPD)Also known as virtual design manufacturing(VD&M)，It is the mapping of the real process of product design and manufacturing in the virtual environment。This paper briefly describes the technical connotation of virtual product development，Aiming at the characteristics of metal plastic forming engineering，The architecture of virtual product development platform for metal plastic forming is presented，The definition of its technical content is also given。 0、introduction The revolution caused by the development of information technology makes our society step into the information society。nowadays，The developed degree of information technology has become a measure of the level of modern science and technology
2015-02-27 Reading quantity 2878
introduction： F3------Hidden directory tree F1------Real-time help ctrl+z---------rescind ctrl+y--------redo ctrl+n--------new ctrl+o--------unpack ctrl+Middle mouse button View zoom in and out alt+Middle mouse button View translation alt+Left mouse button+Middle mouse button View rotation Alt + Enter = nature shift Middle plus key Appear red
2015-02-27 Reading quantity 2897
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