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The open cold extrusion technology is an efficient , low consumption of advanced production technology , typically used in large-scale production of small and medium-sized forgings . Currently , the technology at home and abroad by the universal importance of its low forming force , process simplification , non-polluting and many other advantages has been widely used in the automobile, motorcycle and household appliance manufacturing industry . Numerical simulation as an integrated application of computational mechanics , computing mathematics, information science engineering , support engineering and technical personnel to conduct innovative research and innovative design tools and instruments . On the pipe open cold extrusion forming process of the theoretical analysis , simplified model of a theoretical calculation and selection of the works on the theoretical calculation method : principal stress method and functional balance method , the use of these two methods respectively to get the pipe in the open the squeeze pressure formula cold extrusion process , after the theory test data comparison, theoretical calculations consistent with the experimental results . 3D modeling software Pro / E geometric modeling , finite element software Deform - 3D pipe open cold extrusion process numerical simulation studies and analysis of the velocity field in the pipe open cold extrusion process , stress field, strain field , and the change in the distribution of the pressure stroke curve . Specific research into the mold die cone angle , friction coefficient , thickness to diameter ratio , extrusion speed and other parameters of the pipe open cold extrusion pressure extrusion molding , extrusion size ( elongation , wall thickness increment , squeeze the pressure outside diameter size) , extrusion defects ( end opening defects and pipe surface cracks ) and the stress of the die wall . And were given a the parameters preferred range to reduce the extrusion pressure to improve the quality of extruded parts forming , and reduce the stress of the die wall . According to simulation results comprehensive analysis shows that there is a squeeze pressure smallest die angle i.e. optimum mold half cone angle, select phosphorus saponification lubrication and good annealed state, and the plastic is preferably metal blank , can be reduced extrusion defects occur , while improving the the life of the die have an important role .
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