Hull Parts Cutting Route Optimization And Its Application

As the shipbuilding market downturn in recent years, major shipyards are in deep exploration to improve their efficiency to reap greater benefits. In Huanghai Shipbuilding Co., Ltd (hereinafter referred to as Huanghai shipyard), hull parts cutting is the first procedure in manufacturing on site, in the condition of fixed equipments and working hours, improving the efficiency of cutting parts needs to solve problems in actual production such as reducing cutting ignition times, and shortening the empty cutting routc. This papermms to research on how we did on the basis of existing production condition by drawing into route optimization software which will be carried out the second development according to characteristic of practical production, optimized and improved according to practical construction to perfect function so that it can be used as optimization software in practical production, In this way we realize reducing the empty cutting route of numerical control cutting machine and reducing ignition times for plasma cutting torch to conserve energy and reduce pollution and improve the efficiency.Based on the hull parts cutting procedure and characteristics in numerical control cutting workshop in Huanghai shipyard, combining with some theoretical knowledge of cutting route optimization for hull parts, this paper made following analysis,(1) Studying the theory of route optimization, firstly building a mathematical model for numerical control cutting parts according to Konigsberg Seven Bridge problem and Euler’s theorem, then transforming the hull parts into point and line in model and converted the actual parts cutting problem into a mathematical model and look for the optimal solution of parts cutting through ways of solving mathematical problem. While studying theory, the actual production problem existing in Huanghai shipyard is also considered so as to make the theoretical research more relevant to the actual production. The mainly algorithm methods applied in this paper are bilateral bridge method and minimum spanning tree algorithm.(2) Acquaint the numerical control cutting equipment in the new shipyard of Huanghai shipyard, mainly includes equipment model and model of attaching computer of equipment etc.. Obtain the definition of encryption GM instruction according to the research for the equipment and the generation mode of cutting instruction through the research for nesting software; Study how to translate the instruction generated by nesting software into executable file for hull parts route optimization software. Search the common point of instruction between nesting software and hull parts cutting route optimization software, looking for the interface for the two software to realize conversion of codes smoothly by researching the nesting software. Confirm the feasibility of the software through simulation on computer.(3) Research the present situation of numerical control cutting in Huanghai shipyard and apply the hull parts cutting route optimization software to actual production. Analyzing problems encountered for the software in the practical production to divide the scrape problems for cutting torch into two categories, one is cutting sequence problem, the other is shortage of cutting compensation quantity which to be solved by optimizing cutting sequence theoretically and adjusting cutting compensation quantity, then verifying the solution of the problems by a lot of experiments. Data collecting and statistics to be made by a large number of cutting experiments after the problem being solved, by so, the software is applied to daily production favorably. Analysis the comparison of production efficiency before and after using the hull parts cutting route optimization software, and verify the superiority in practical production by comparing data of cutting empty route and ignition times of plasma cutting torch. Prove the feasibility of production with applying hull parts cutting route optimization software through a lot of experimental data; thereby finally apply the software to practical production in Huanghai shipyard progressively.