C型钢的冷弯成形工艺参数分析及成形质量研究

发布时间：2018-02-22 14:16

本文关键词： 冷弯成形 C型钢均匀试验设计非接触式应变测量剪切质量　出处：《宁波大学》2017年硕士论文　论文类型：学位论文

【摘要】：C型钢作为金属骨架,广泛应用于建筑行业,其质量和使用寿命直接影响着建筑工程的安全。因此,对C型钢成形质量的研究显得十分必要。影响成形质量除了工艺参数外,还有型钢切断环节的断面质量。由于检测手段的有限,关于产品的检测多是通过目测,对其内部质量的好坏和局部的成形细节并没有成熟的判定指标,冷弯成形技术在行业中仍停留在一个处处靠经验设计的阶段,这严重影响着我国冷弯成形技术的发展。本文以MSC.Marc和Deform为有限元软件的平台,分别建立了冷弯成形的仿真模型和模剪模型,采用实验和仿真相结合的方法,对C型钢从板材成形到切断的全过程进行了仿真和实验验证,对成形的工艺参数、剪切工艺参数对成形质量的影响规律展开了系统研究:(1)建立薄壁型的体单元模型,并将其划分为外、中、内三层进行了成形应力和应变的分析,得到了成形过程的应力应变分布的规律。(2)分析了成型角增量,轧辊间距和进给速度这三项因素对成形质量的影响,选取轧辊间距和进给速度进行了五水平的均匀试验设计,并对比了与正交试验设计的优缺点,发现了两因素对成形质量影响程度的大小及影响规律。(3)采用三维体单元建立了C型钢剪切的模型,并对模型进行了大量的网格局部细化分,通过剪切相关工艺参数的仿真及断面质量的分区域分析以及实验验证,得到了工艺参数对剪切成形质量的影响规律。(4)采用非接触式应变测量的方法对成形应变进行了测量,并与仿真模型的预测结果进行了对比,验证了仿真模型的可靠性,提供了成形质量的测量指标;此外,对冷弯成形的残余应力进行了测量,得到了C型钢残余应力的分布规律。本文研究结果为提高C型钢的冷弯成形质量提供了重要的理论依据。
[Abstract]:As a metal skeleton, C section steel is widely used in the construction industry. Its quality and service life directly affect the safety of building engineering. Therefore, it is necessary to study the forming quality of C section steel. Due to the limited means of testing, the inspection of products is mostly through visual testing, and there are no mature criteria for determining the quality of the products and the local forming details. The cold forming technology is still in the stage of experience design in the industry, which seriously affects the development of cold forming technology in China. In this paper, MSC.Marc and Deform are taken as the finite element software platform. The simulation model and die shear model of cold forming are established respectively. The whole process from sheet forming to cutting is simulated and experimentally verified by the method of combining experiment and simulation. The influence of shearing process parameters on the forming quality was studied systematically. (1) the thin-walled body element model was established, and it was divided into three layers: outer, middle and inner, and the forming stress and strain were analyzed. The influence of forming angle increment, roll spacing and feed speed on the forming quality is analyzed. Five levels of uniform test design of roll spacing and feed speed are carried out. Comparing with the advantages and disadvantages of orthogonal design, it is found that the influence of two factors on the forming quality and the influence law are found. The model of C section steel shear is established by using three dimensional body element, and a large number of mesh local refinements are carried out on the model. Based on the simulation of shear parameters and the sectional analysis of cross section quality and experimental verification, the influence of process parameters on shear forming quality is obtained. (4) the non-contact strain measurement method is used to measure the forming strain. Compared with the prediction results of the simulation model, the reliability of the simulation model is verified, and the measurement index of forming quality is provided. In addition, the residual stress of cold forming is measured. The distribution of residual stress in C section steel is obtained. The results of this paper provide an important theoretical basis for improving the forming quality of C section steel.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG306

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