Papers by Keyword: Assembly Process

Abstract: This study is designed to investigate the influence of multi-beam matrix laser cutting process on NAND Flash package quality, and find out the important process parameters of multi-beam matrix laser process are defocus amount, laser power, cutting speed and material thickness. Then use the finite element analysis software ANSYS to obtain the minimum temperature influence, stress and strain, and use Taquchi method and variance analysis (ANOVA) to find the optimal temperature combination, the optimal combination of stress and strain and its contribution degree. Finally, the reliability is tested by verification experiments, and the error is found to be within 3.638%. It is confirmed that the optimized parameter combination has high repetitiveness. It is hoped that this study can contribute to the multi-beam matrix laser cutting process.

Abstract: To solve the problem of difficult process data management caused by the unstable process in complex products assembly, by introducing the workflow technology, a method of multi-dimensional assembly process data management based on workflow was proposed. The evolution model of assembly process information was established from the perspectives of granularity, cycle and version. On this basis, the assembly process information organization model based on workflow was put forward. The detailed description of the management method of process data’s evolution in the perspectives of granularity and cycle was presented. The feasibility of proposed method was proved by actual engineering applications.

Abstract: In aviation industry, it’s urgent to build a scientific and effective knowledge system with high scalability to change the fact that the data is rich while the knowledge is deficient. We constructed the knowledge ontology of aircraft assembly with cyclic acquisition and seven step methods based on ontology thought. Then, we obtained the potential relationship related to process and abstract process ontology through logic reasoning. Finally, OWL is applied for ontology formal description to realize knowledge standardization and normalization. It’s meaningful to reuse, share the assembly process knowledge and further reasoning in the aviation field.

Abstract: Focus on the problems that heavy duty machine tool lack of fault samples and process information in repetitive assembly, result in the existing assembly process method can’t meet the repetitive assembly accuracy. According to characteristics of local machine assembly process, propose its assembly repeatability evaluation indexes. Establish the mapping relation among machine performance, assembly accuracy and structure, and built a hierarchical model of assembly process, obtain the process optimal design scheme of assembly accuracy repeatability. Use the multivariate function differential method, propose a calculation method of heavy machine assembly accuracy, and verify applicability of the method, depend on the machine loads and structure criterions, propose heavy machine assembly accuracy repeatability optimization method, example analysis shows that: the servo effect of repetitive assembly accuracy in new process is obvious, simultaneously stress field magnitude and stability of new technology is better than the original, realize effective control of the machine tool assembly accuracy repeatability.

Abstract: Aircraft manufacturing process normally requires very high precision assembly parts which are achieved in practice by a high-precision machining parts followed by a high coordination degree assembly process. The current practice in aircraft parts manufacturing process is that the manufacturing cycle is long, the rework rate is high and the manufacturing precision is difficult to improve. This can be sometimes infeasible or very costly. In this paper, we consider a fit degree calculation method to achieve precision aircraft parts with economical manufacturing processes. We consider an analytical approach to establish a physical process model to guide the design and machining process of assembly parts, which can assume the fit degree. The results show that the approach can obtain the nearly optimal process parameters at designated fit degree. At last, a case is developed to verify the proposed methods.

Abstract: Some motor assembly enterprises manage production site according to experience, which causing process was not scientific and lower efficiency. Through researching for a motor assembly production field, analyzed and improved the process and site layout using industrial engineering method such as 5W1H and ECRS etc., optimized layout of store, reduced processing and transportation 2 times each, canceled unnecessary wait, saved transportation distance 20.6m, reduced production cycle 8.1 min, at the same time, the site operators was decreased through the reasonable allocation, greatly increased the production efficiency, make the management more scientific and reasonable.

Abstract: With the continuous deepening of the assembly process of automobile, the analysis and test technology of the production system become more important. According to a transmission company automobile speed changer production enterprise assembly process as the object, established the assembly process model, analyzed the bottleneck, imbalance, logistics transport not smooth and so on of the assembly line. Increase the production capacity of production system through analyzing and testing the model.

Abstract: Based on the analysis of structure characteristics of unilateral permanent magnet linear motors, two key points of assembling, how to avoid the stronger magnetic attraction and ensure dimensional precision of the air gap between primary section and secondary section, were discussed. Several new methods of designmachining and assembly process were presented, assured the accuracy and stability of unilateral permanent magnet linear motors. The measuring results met the performance requirements.

Abstract: This article presents possibilities of precision assembling process by using special tools of the augmented reality (AR) and logical procedures from related areas such as a Computer Aided Design and Planning. These possibilities are implemented in the virtual assembling environment of AR, where engineers and designers can see important information about an exact position and orientation of the single assembly element that creates a part of the entire assembly structure. By means of this the application of AR allows costumer to see the motion process of single assembly item according to its trajectory and prevents the possible mistakes in the assembling processes.

Abstract: Development of intelligent assembly cell conception includes new solution kind of how to create structures of automated and flexible assembly system. Intelligent behavior of the system as the control system will repose on monitoring of important parameters of the system in the real time. Interaction information will be taken from flexible reaction data. This kind of flexible conception realization of intelligent assembly systems brings many advantages such as, cell will brings flexible reactions of the system to the manufacturing changes, build up area saving, lover building costs, higher using effects of whole device. This conception is developed at Institute of the manufacturing systems and applied mechanics and continues at an intermediate stage of the project. The paper is presented the description of the new conception philosophy, design of the individual units in the system characterized as an intelligent assembly cell, functions principles and expected proceedings in the next phases of the project.