Research And Realization For Assembly Sequences Planning On Delamination And Compression

Product Digital Pre-Assembly (PDPA) technique is a new product manufacturing idea generated with the rapid competition in the manufacturing markets in recent years. Its goal is to use the developed computer virtual manufacturing technique, characteristics of manufacture and the advanced design theories to realize the digital and intelligent products. By using the PDPA Technique we can find all kinds of problems during the process of product design and product making, thus can cut down the costs of product design, improve the efficiency of the product design, reduce the cycle of product design and improve the competition ability in the manufacturing markets.The deeper researches have been done on the product assembly modeling technique and Assembly Sequences Planning (ASP) technique of the Assembly Planning that is the key technique of PDPA Technique in the dissertation. The structure and the main content of this dissertation are addressed as follows.In the 1st chapter, we firstly introduce the research and application backgrounds of the PDPA technique. Secondly the real background produced by the ASP technique is given. Thirdly we discuss the origin and development of the ASP technique in details. At last the status quo of China and overseas in the ASP area is given and the typical ASP arithmetic is been analyzed and evaluated.In the 2nd chapter, we mainly discuss the structure of our system, briefly introduce the structure of the ASP system, and give the data flowchart of the PDPA, then show the main goal of the design that ASP is a key module of the PDPA project.In the 3rd chapter, we mainly focus on how to express and construct the assembly information, which including abstracting the geometry information and adding the constrain information. Firstly, we briefly introduce the assembly model, analyze and evaluate the typical assembly model. Secondly, we propose a new-layered assembly model which is based on discrete face. At last, we briefly discuss how to use the DENEB system to abstract the information from the CAD model and how to add constrain information to the DENEB model.In the 4th chapter, the main idea and the flowchart of the delamination and compression arithmetic are briefly introduced, and then the improvement and realization is proposed for the arithmetic. Firstly, we propose the local direction finding arithmetic by using the discrete sphere method. Secondly, we propose the main direction concept which can cut down the computational complexity. Thirdly, we bring forward the projection method which is used to find the adjacent relation. Fourthly, the arithmetic of how to create the disassembly directed graph and how to create the encapsulate disassembly directed graph are given. At last, the ASP arithmetic is proposed. In the 5th chapter, Firstly, the main flowchart of the delamination and compression arithmetic which is based on adjacent relation is given, then the key technique in the ASP arithmetic is discussed, including the disassembly direction finding method, the adjacent relation finding method, the disassembly, direction graph creating method, the encapsulation disassembly direction graph creating method and the assembly sequences creating method.In the 6th chapter, an example is given to describe the process of the ASP arithmetic in detail.In the end, all of the works in this dissertation are summed up, and their futures are proposed.