【作者】 马文博；

【导师】 齐广霞；

【作者基本信息】 沈阳理工大学 ， 材料加工工程， 2011， 硕士

【摘要】 现代旋压是一种先进的金属塑性加工技术,在航天、航空、军工等领域中得到了日益广泛的应用。然而实际生产中影响产品质量的因素很多,各参数之间的合理搭配需要人员反复摸索调试,有限元数值模拟技术可改善这一过程。本文采用数值模拟方法和实验技术对薄壁管材滚珠旋压成形工艺展开了研究,论文主要结果如下：(1)基于DEFORM-3D有限元平台,建立了滚珠旋压过程的有限元模型,分析了工艺参数如减薄率、轴向进给比和滚珠工作角对成形质量的影响规律,经过理论和实验参数对比分析,获得了合理的旋压工艺参数：减薄率Ψt=25-30%,轴向进给比f=0.5～1.0mm/r,滚珠工作角20°左右。(2)对大直径(300mm)GH4169管材滚珠旋压成形过程进行了研究,分析了旋压过程中金属的流动规律。通过模拟多道次旋压成形过程,分析了各道次工艺参数对成形效果的影响,探讨了成形的可能性。就轴向进给比、滚珠直径和减薄率对大直径管材成形的影响进行数值分析,得到了一定结果。(3)对管材滚珠旋压力进行了理论计算,分析接触变形力条件,推导出接触变形压力计算公式,确定了管材滚珠旋压力理论计算物理模型,并比较分析了数值模拟结果和物理模型计算结果的差异,给出该旋压力计算模型的应用范围。(4)完成了GZ300型号的管材滚珠旋压机设计工作,设计主要部件包括旋压机油缸设计、电动机及带传动和整体模具设计。确定了旋压机的主要参数,其中包括旋压机压力机最大行程,工件最大直径,工件最大长度,工件最大壁厚等。更多还原

【Abstract】 Modern spinning,used as an advanced plastic forming technology,has been widely applied to many fields,such as Aeronautics,Astronautics and Weaponry,etc.However,in the process of manufacture,many process parameters affect the qualities of spinned parts,people have to establish process parameters by trial-and-error approach,this process can be improved by the finite element numerical simulation technology.In this paper,research is carried out by numerical simulation and experiment technology for ball spinning forming process of thin-wall tubes,its main results are as follows:(1) Based on DEFORM-3D finite element platform, finite element model of ball spinning process is established. The influence law of forming quality with process parameters such as thinning ratio, axial feeding ratio and ball working angle is analyzed,through theoretical and experimental parameters comparative analysis,there are reasonable spinning craft parameters:thinning ratio=25-30%,axial feeding ratio f=0.5-1.0mm/r,ball working angle 20°.(2) Ball spinning forming process in GH4169 large diameter(300mm)tubing has been studied,metal flow pattern of spinning process has been analyzed.Multipass spinning forming process and each lane process parameters on forming effect are simulated,the possibility of forming is discussed.The influence of the axial feeding ratio, ball diameter and thinning ratio on the large diameter tubing forming is on numerical analysis,and gain some law.(3) The theory research on calculation of the tubing ball spinning pressure is carried through,and analysis the conditions of the contact deforming force. The calculation formula of contact deforming pressure is derivated,then the physical model of theoretical calculation for the tubing ball spinning is determined.There are compared differences between the numerical simulation results and the physical model calculation results,so range of applications with the spinning force calculation model is given.(4) The design work for GZ300 models of tubing ball spinning is completed,design for main components is included of cylinder design,motor with belt transmission and the whole mold design.The main parameters for spinning machine have been determined including the longest press trip of the spinning machine,the biggest diameter of the workpiece,the maximum length of the workpiece and the maximum thickness of the workpiece.更多还原