Research On The Frame Cold Bending Controlled By Computer Visual Inspection

With the development of modern industry, automatic production is required to be higher and higher. Shipbuilding is an important component of national economy. The production process of shipbuilding will be more automatic, digital, information. This tendency is continuous and can't be stopped. In the production process of shipbuilding, section processing is an important part, the efficiency and quality of which will affect the efficiency and quality of whole shipbuilding process. So it is very meaningful and profitable to research automatic ways in which we can process section efficiently.Having studied the current ways in which national and overseas shipyards produce ship and the visual inspection technology which is rising in recent years, this paper puts forward that visual inspect technology can be used in section processing. The paper also analyses and discusses this question. After creating a program which is used to control section processing, the paper acquires some preliminary achievements at last. The paper consists of six chapters.In chapter 1, the aim of the study is proposed. The development and present situation of section processing, straighten anti-curve line method and visual inspect technology are introduced. At last, the main content of this paper is proposed.In chapter 2, the theories about straighten anti-curve line are introduced concisely. The basic principle and calculation about straighten anti-curve line are included .In chapter 3, the basic theories about bitmap are introduced as the preparation for programming at the beginning of this chapter ,then the way in which the straighten anti-curve line is identified from background is introduced in detail and programmed.In chapter 4, mathematical theory about related coefficient and fitting of straighten anti-curve line is introduced at the beginning of this chapter, then how to program to calculate related coefficient is introduced including discussing the appearance of straighten anti-curve line in bitmap, searching the ends of straighten anti-curve line, calculating the angle bitmap should be turned,calculating related coefficient after bitmap has been turned. At last, straighten anti-curve line is fitted.In chapter 5, how to choose parameter used in controlling frame processing with visual inspection technology and how to solve spring-back of frame are proposed in detail. On this basis, the whole process of cool bending frame is discussed in the paper.In chapter 6, a summarization of the paper is given and the farther research works are proposed.