Applied Mechanics and Materials Vols. 365-366

Abstract: To solve the forming problems of the outdoor antenna reflector elements with large curvature continuous surface, the combined forming process (CFP) of stretch preforming and cemented postforming was proposed. The key technologies of CFP mainly included four technologies such as the building of a surface model, the creation of the process supplement surface (PSS), the setup of the three layers aluminum plates (TLAP) locating holes and the laser cutting process to shape the outer edge of the TLAP applied in the reconfigurable multi-point die (RMPD). These key technologies were systematically researched. The measurements of the reflector elements and comparative analysis between the three processes (CFP, slitted and slotted process) were given. The results showed that the CFP had an advantage in large curvature forming, high precision forming and continuous working surface forming.

Abstract: Green design and manufacture is a kind of sustainable development model in modern manufacture. This paper focuses on green design concept, application and selection of green materials and product manufacturing based on the recycling theory.

Abstract: In the green modular design method that oriented remanufacturing engineering, the equipment remanufacturing is taken as the design purpose, the modular design method as the basis, the green design and the modern mathematic method as the auxiliary means. In the beginning of remanufacturing, that is, before the birth of the entity life, the environmental attributes of the equipment and the reuse of the parts in the full life cycle are fully taken into account, and the green degree reflecting the environmental characteristics and the module degrees reflecting the functionality and usability features are evaluated and tested. The proposed design method can meet environmental attributes of the equipment and remanufacturing requirements at the same time, and it is satisfied with the fundamental purpose of remanufacturing.

Abstract: The continuous flexible roll forming process is a novel sheet metal forming technique for effectively manufacture of three-dimensional surface parts. In this study, two types of finite element (FE) models were developed under the ABAQUS/Explicit environment. The difference of the two models is that the rolls are defined as discrete rigid bodies in model No.1 and are deformable in model No.2. An experiment was carried out using the continuous sheet metal forming setup. The comparison of the numerical computation results with the experimental results shows that the model No.2 can be used for the shape prediction of continuous flexible roll forming process well.

Abstract: This paper addresses the problems of EMAS (an engineer material to arresting aircraft on the ground) production operation that the intensity of each product was uneven and cellular concrete was not completely crumple.In order to solve the problem the development of a nonlinear planning model for EMAS production was presented. The model is based on the company it could be helpful in guiding production. The second part of the work were optimization the model and get theoretical optimal value rely on both continuous and discrete time representations.

Abstract: Security is the first requirement of obsolete solid rocket motor pretreatment. In response to this requirement, quantitative safety assessment of four units in the pretreatment of obsolete solid rocket motor was carried out by using ICI Mond Index; risk rating of each unit was obtained and weak links in the pretreatment security were analyzed; and then appropriate safety measures were proposed, providing scientific guidance for the safety of obsolete solid rocket motor pretreatment.

Abstract: In view of large load, the shape of large crank forgings and forging process are designed reasonably. Large crank forging process is simulated by numerical simulation software DEFORM-3D to improve the forging process and the dies, including adding upsetting step and related dies. The result shows that improved process and dies can obtain higher quality finish forgings and the load reduces to a rational level, which provides basis for crank forging process and die design.

Abstract: 3D digital assembly process design technology is the combination of the three dimensions and information with the new software technology in traditional process design. This article is based on an aviation manufacturing enterprises priority to the realization of the whole assembly process design, simulation and verification business process, which mainly with Dassault Companys DELMIA and 3DVIA Composer platform. In this paper, some process design thinking and methods are introduced to the aircraft product process about the separation technology division, BOM reconstruction, process simulation, 3d assembly instruction compiling, and the like. It also introduces some application methods of system integration.

Abstract: In this paper, a change of die roll height according to the die chamfer shape and V-ring distance of a fine blanking tool was studied by experiments on a special part with various corner shapes. Three guide plate inserts with different V-ring positions and three die inserts with different die chamfers were machined, and then a fine blanking tool was manufactured for the fine blanking experiments. Nine experiments were conducted on a 650-ton fine blanking press. Each die roll height was measured and analyzed. It would be noticed that the die roll heights on the corner shapes of the fine blanked parts increased with increasing V-ring distance and die chamfer angle, but it decreased with increasing corner radius and angle. The results in this study can be used to minimize the die roll height of fine blanked parts with corner shapes when designing the V-ring and die chamfer of a fine blanking tool.

Abstract: The optimized maintenance strategy of multi-stage production line is influenced by device processing ways, parts process plan and equipment deterioration process and other factors. Moreover, the production processes of parts exist constraint relationship. Based machining process plan of complex parts, the order relations of its operation processes is analyzed; the optimized multi-stage production line maintenance model is constructed with multiple objectives including production time, maintenance time, production cost and maintenance cost; the genetic algorithm is used to solve the model, and the Monte Carlo method is applied to carry out the simulation computation for fitness function of chromosome of genetic algorithm; the results give the maintenance threshold of each equipment of the line, their configurations and allocation of the various operation processes of parts at the same time. Finally, an example is presented to prove the effectiveness.