扭曲型材火工成形的工艺参数研究

发布时间：2018-05-25 01:17

本文选题：扭曲型材 + 火工成形　；参考：《大连理工大学》2015年硕士论文

【摘要】：船用扭曲型材在造船过程中有着较大的需求量。传统型材加工成形多数局限于通过冷弯机器进行型材长度方向上的弯曲。这样的型材可以满足多数的工程需要,但是涉及到扭曲型材的成形,传统冷弯加工则暴露了其局限性。火工加工的自动化程度非常差,一般是通过人工依据经验进行加工,加工效率较低,型材成形精确度也较差。由此,本文进行了扭曲型材火工成形的工艺参数研究。探索扭曲型材火工成形的规律,推进型材自动化加工的研究进程。本文通过有限元分析软件对扭曲型材火工成形过程进行了数值模拟,建立了一个非线性瞬态间接耦合的热-结构分析的三维模型。通过模拟实验,总结了扭曲型材火工成形中的影响温度场的几个因素,包括：型材厚度、燃气流量、热源移动速度、型材材料、冷却方式等,其中,型材厚度、燃气流量、热源移动速度影响最大。从两方面分析了扭曲型材火工成形中影响变形场的几个关键工艺参数,第一个方面是从影响局部变形场的参数进行研究,主要包括：型材尺寸、燃气流量、热源移动速度、约束的施加这几点；第二个方面是从影响整体变形场的因素进行研究,主要包括：热源施加顺序和受热面两方面因素。并且,对影响纵向线变形的几个因素进行了简单探讨。最后,本文对扭曲型材火工成形的工艺参数和成形角度之间的关系进行了分析,并提出了以体功率为自变量的数学模型,初步探索了扭曲型材火工成形的工艺参数设置。
[Abstract]:There is a large demand for warped sections in shipbuilding. Traditional profile forming is limited to bending of profile length by cold bending machine. This kind of profile can meet most engineering needs, but it involves the forming of twisted profile, which is exposed by traditional cold bending. The degree of automation of explosive processing is very poor, which is usually processed by manual experience. The processing efficiency is low, and the forming accuracy of profile is also poor. Therefore, the technical parameters of the twisting profile are studied in this paper. To explore the law of the twisting profile pyroforming and to promote the research process of profile automatic processing. In this paper, the numerical simulation of the pyroforming process of twisted profile is carried out by means of finite element analysis software, and a three-dimensional model of nonlinear transient indirect coupling thermo-structural analysis is established. Through the simulation experiments, several factors affecting the temperature field are summarized, including: profile thickness, gas flow rate, heat source moving speed, profile material, cooling mode, etc., among which, profile thickness, gas flow rate, etc. The moving speed of heat source is the most important. In this paper, several key technological parameters which affect the deformation field are analyzed from two aspects. The first aspect is the study of the parameters that affect the local deformation field, including: profile size, gas flow rate, heat source moving speed. The second aspect is to study the factors that affect the whole deformation field, including the heat source application sequence and the heating surface. Furthermore, several factors affecting the longitudinal line deformation are discussed briefly. Finally, the relationship between the process parameters and the forming angle of the twisting profile is analyzed, and the mathematical model with the body power as the independent variable is put forward, and the setting of the technological parameters of the twisting profile initiating forming is preliminarily explored.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U671

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