【作者】 周洪宝；

【导师】 莫德秀；

【作者基本信息】 山东理工大学 ， 材料加工工程， 2008， 硕士

【摘要】 管形件已广泛应用于航空航天、管路管道、石油化工、轻工、交通运输及日常生活用品等工业部门中,管形件塑性加工是对管坯通过各种塑性加工手段制成管形零件的加工技术。由于管形件塑性加工是指对管坯的二次加工,因此管形件塑性加工属于管坯深加工技术的范畴。本文简要介绍了管形件成形的方法及有限元模拟在塑性成形中的应用,针对20钢管坯胀形的问题,建立有限元模型,采用有限元模拟软件DYNAFORM,对典型的管形件三通管成形过程进行了模拟,分析了不同的应力应变及各种工艺参数对胀形成形的影响,主要分析了反压力、内压力、两端轴向进给量、厚向异性系数、摩擦系数、圆角半径等对胀形的高度、壁厚的影响。找出其中的规律性,并对其原因进行分析。由于管形件胀形时变形量较大,各个参数的影响相对复杂,仅仅通过三通管很难说明这些参数变化的规律性,因此又通过对多通管自行车中接头进行模拟,分析内压力、两端轴向进给量及各个参数的影响规律,通过与三通管中各个参数进行比较,优化模拟参数,然后用优化后的模拟参数重新对三通管和中接头进行有限元模拟。通过分析比较,得到了较为合理的20钢的模拟参数,并用优化的模拟参数对等径四通管进行模拟,验证各个模拟参数的正确性。更多还原

【Abstract】 Tubular products are more and more extensive used in aeronautics and astronautics, pipeline,petrochemical, light industry, automobile and life supplies and so on. Tubes plastic processing is to form the tubular products making use of plastic processing method. Tubes plastic processing is the secondary processing, so the tubes plastic processing belongs to the field of further machinery technology.This paper introduced the forming method of tubular products and finite element simulation using in the plastic forming briefly, and established the finite element model of tubular products of 20 steel. Then simulated the process of teetube’s bulging forming using the finite element simulation software DYNAFORM and analyzed the stress, strain and other technological parameter that influenced the height and thickness of bulging forming, including the back pressure, internal pressure, amount of feed in the tops, anisotropy coefficient, friction coefficient, radius of rounded angle and so on. Find the regularity and the reason.Deformation amount of the tubular products is larger in the bulging forming, the influence of parameters is complicated. So it is difficult to illustrate its regularity. It is necessary to simulate the multi-tube -the bicycle frame connector to compared with the teetube in the internal pressure amount of feed and other parameter. Then optimized the simulation parameter and simulated the teetube and multi-tube again using the optimized parameter.Compared and analyzed with each other and the simulation parameter of 20 steel can be obtained, and be used to simulated the cross pipe to verify the correction of the simulation parameter.更多还原