Materials Science Forum Vols. 626-627

Abstract: In view of low efficiency and high cost during the operation of the manufacturing and assembly line to redistribute workpieces, this paper presents a logistical balancing method based on time and costs in manufacturing and assembly line. The workpieces are selected in a short time by use of database and spreadsheet. The iterative computation will stop when the expense is higher than benefit. This method is especially suitable for the small and medium enterprises which can not burden the re-program cost. An example about Harbin HBC Value Co. Ltd is given to explain the logistical balancing method. The results show that the implementation of this logistics balancing method offer the way to improve the efficiency of vacant time by 62.6% and the cost of product is reduced greatly.

Abstract: The classical job-shop scheduling problems (JSP) become assembly job-shop scheduling problems (AJSP) if assembly constraints are attached to them. The entire solution space size and the feasible one of AJSP are analyzed and obtained by utilizing combinational mathematics. It is proved that the feasible solution space takes extremely small portion of the entire one. To minimize the makespan of AJSP, genetic algorithm searching in feasible solution space (FGA) is proposed and designed, and the search range of FGA is limited to feasible solution space. Finally, benchmarks tests and results are given which demonstrate the advantage and efficiency of FGA.

Abstract: To solve dynamic modification consistency of production plan and scheduling for process manufacturing enterprises, firstly the integrated architecture and implementation of e-manufacturing in iron & steel industry is presented. Then the integrated system architecture about administration and management, production process, remote monitoring is built and its characteristics, scheme and concrete design & implementation method are elaborated. The integrated structure effectively realizes information sharing among the sub-systems within process enterprise.

Abstract: A lot of practical problem, such as the scheduling of jobs on multiple parallel production lines and the scheduling of multiple vehicles transporting goods in logistics, can be modeled as the multiple traveling salesman problem (MTSP). Due to the combinatorial complexity of the MTSP, it is necessary to use heuristics to solve the problem, and a discrete particle swarm optimization (DPSO) algorithm is employed in this paper. Particle swarm optimization (PSO) in the continuous space has obtained great success in resolving some minimization problems. But when applying PSO for the MTSP, a difficulty rises, which is to find a suitable mapping between sequence and continuous position of particles in particle swarm optimization. For overcoming this difficulty, PSO is combined with ant colony optimization (ACO), and the mapping between sequence and continuous position of particles is established. To verify the efficiency of the DPSO algorithm, it is used to solve the MTSP and its performance is compared with the ACO and some traditional DPSO algorithms. The computational results show that the proposed DPSO algorithm is efficient.

Abstract: A new kind of work-in-progress control system (I-WCS) is proposed, in which two control algorithms, the proportional & integral control (PI) and the statistical process control (SPC) are integrated to maintain a reasonable amount of work-in-progress (WIP) in discrete manufacturing systems. Taking the production line of certain motorcycle engines’ crankcases as an example, its I-WCS system is proposed. It consists of two integrated controllers, which are able to collect real-time production data, draw Shewhart control charts, and get these charts analyzed and acquire real production scheduling schemes. Simulation results show that I-WCS can maintain lower and steadier WIP in production lines so as to improve the ability of on-time delivery.

Abstract: Computer Aided Industrial Design System is a key component of the product digital design platform. It is equally important to control its design process and manage its data and documents effectively to share the data generated in the whole design process. Based on the analysis of the basic functions of the product digital industrial design platform, this paper presents the general model and function frame of product data management system oriented to computer aided industrial design according to its data composition character, integrative method of application software and industrial design flow in the process of computer aided industrial design. In addition, with the industrial design of the pneumatic tools as the object, this paper presents the product data management system to achieve the system integration of computer aided industrial design, 3-D structure design and CAE analysis and the data share.

Abstract: In PDM system, there exist many users, such as employees, partners, and customers. To protect resource from illegal access, it is very important to enforce access control policy in PDM system. RBAC is widely used as an access control model in PDM system. But, it is difficult for RBAC to support complex access control policy. This paper proposed a simple, flexible way to express and enforce access control policy. To keep the integrity of system security and make the system administer work easier, we propose auto revocation triggered by time and access control policy in our model. At the end of this paper introduces a system architecture and auto revocation algorithm. We also give some examples to show how this model works in PDM system.

Abstract: Based on the quality survey of the working procedure of interior hole grinding of the ceramic shaft bush parts, this paper analyzes and studies it by the quality control tools such as Pareto diagram and Cause and effect diagram, and finds out the main deficiency indicator. The main influencing factor is that the verticality of the interior hole is Ultra-poor in the Process quality deficiencies. A series of the testing data of this deficiency indicator has been analyzed in order to obtain the factors influencing the deficiency indicator. Finally, comparison is made between the quality status before and after implementing improvement measures and measures of adjusting processes are taken to greatly improve the effect and the product qualified rate, which can provide reference for enterprises to improve the quality in the production process.

Abstract: In order to servitize manufacturing enterprises and meet the need of product service system, approaches to servitization are studied. Design for service method, manufacturing for service mode, and product-based service are regarded as key problems and discussed in detail respectively. Concept and evaluation standards of product service relationship are also discussed. And some significant topics for future studies are put forward.

Abstract: To achieve the short and reliable due date of mould, it is crucial to control effectively the production of shop floor. A job release control model was proposed in this paper. Firstly, decision problems of input control job release were analyzed in mould industry. Then, considering the uncertainty of the production durations and optional resources, an input control job release mechanism was proposed. Finally, the calculating algorithm for the direct and indirect workload of load centers was found. Furthermore, a calculating sample was introduced.