Study On The Hot Forging Deformation Mechanism And Process Optimization Of Petroleum Pipeline Valve

The petroleum pipeline valve body is the indispensable fluid control equipment,which played a key role in petroleum, chemical industry and other fields. As the main partsof the valve body, the property and forming process of product have directly effect on theproduction cost of enterprise, working environment and the service life. etc. Comparedwith the traditional forging, the precision forging process have their own characteristics,The process can be used to reduce manufacturing costs and shorten production cycle timewhile assuring product quality with good mechanical properties. So the traditional forginghave been replaced by the precision forging process.The object of this thesis is to study the hot forging deformation mechanism ofpetroleum pipeline valve. Adopts the method of open die forging to forming the valve body.The concrete research and development objectives consist of the following:①The combination of theoretical knowledge of forging technology, we can designthe structure of mould and the size of workpiece according to the valve part drawings,which provided by forging factory; using PRO/E software to built the three-dimensionalmodel.②Through design orthogonal experiment, the mold flash land height, the width ofthe bridge and billet height to diameter ratio as the main factor, filling metal as test indexes.The hot forging process was simulated by the commercial finite element codeDEFORM-3D with the best flash size and blank size.③According to the results of numerical simulation of the optical scheme. Analysisthe metal flow conditions of workpiece, including: the distribution of stress, strain,temperature field and the size of the forming force.④Based on the orthogonal experiment simulation, then design and produce themould, the hot forging were carried out in the equipment with16T hydraulic die forginghammer. Finally using the valve specimen do a performance testing.⑤In order to study on the hot forging deformation mechanism of the valve. Throughanalysis and comparison of finite element result with the physic experiment testing, theresults shows: the microstructure of material have occurred a series changes during the hotforging, which have important influence on the quality of product. Simulation results are reliable through physical experiment validation. To a largeextent, the process of numerical simulation will reduce test cost effectively. Study ofnumerical simulation, Reduction of environmental pollution,reducing costs, improvingproduction efficiency and the quality of the valve body has important practical significance.And valve industry will develop in the direction of green, low carbon production.