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The process of cross wedge rolling and final forging for valve blank was studied by the method of numerical simulation combined with practice. According to the requirement of cross wedge rolling process and the final forging process of valve blank, several kinds of preformed blanks with different transition fillet radii were designed, and the final forging process was simulated by the finite element software. Some deforming regulations of metal flow, the maximum forming load of the billet with different transition fillet final and the contact conditions of the blank and the concave die were analyzed. The results show that compared with the transition fillet radius of the forging part, the closer is the fillet radius of the blank and the forging part, the better is the comprehensive effect. When the fillet radius of the blank is too small, the forming load becomes smaller, but the oxide skin of the blank transition fillet radius is difficult to be removed and a shallow extrusion traces occurs. In addition, the larger is the blank fillet radius, the greater is the forming load. The extrusion traces are deeply produced and the mold will be seriously worn, and thereby the die life will be shortened.
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［1］李明,孙友松.发动机气门成形加工发展综述[J].锻压装备与制造技术, 2007,42(6):18-21.Li M, Sun Y S, Review of forming technique development for engine valves[J]. China Metalforming Equipment & Manufacturing Technology,2007,42(6):18-21.
［2］肖小亭,章争荣,孙友松,等.气门芯终锻成形过程的数值模拟[J].锻压技术, 2003, 28(2): 8-10.Xiao X T, Zhang Z R, Sun Y S, et al. Numerical simulation of engine valve finish-forging process[J]. Forging & Stamping Technology, 2003，28(2):8-10.
［3］陈文,梁升,段发明.气门电镦成形的常见缺陷原因及处理[J].机械工人, 2005, (6):73-74.Chen W, Liang S, Duan F M. The common defects and treatment of valve electrical upsetting forming[J]. Machinist Metal Forming, 2005, (6):73-74.
［4］王国顺，夏巨谌，胡国安,等.气门电热镦粗工艺的数值模拟[J].塑性工程学报，2004，11(1):57-60.Wang G S, Xia J C, Hu G A, et al. Numerical simulation of electrical upsetting process for valve[J]. Journal of Plasticity Engineering, 2004, 11(1):57-60.
［5］周小伟.排气门电镦缺陷成因及防治措施[J].内燃机配件, 2003, (3):11-13.Zhou X W. Causes of defect of electric upset forging and countermeasure for exhaust air valve[J]. Internal Combustion Engine Parts, 2003, (3):11-13.
［6］肖小亭,章争荣,孙友松,等.电镦成形过程中产品缺陷原因分析与质量控制策略[J].热加工工艺, 2001,30 (1): 45-48.Xiao X T, Zhang Z R, Sun Y S, et al. Product defect reasons analysis and quality control strategy in electric upsetting deformation[J]. Hot Working Technology, 2001, 30(1):45-48.
［7］王海江,夏巨谌,王新云,等.气门热挤压预成形和终锻成形过程模拟[J].锻压装备与制造技术, 2006, 41(3): 50-52.Wang H J, Xia J C, Wang X Y, et al. Process numerical simulation on hot extrusion preforming and final forging of automobile valves[J]. Forming Equipment & Manufacturing Technology, 2006, 41(3): 50-52.
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