Advanced Materials Research Vol. 421

Abstract: Because there exist some disadvantages of the traditional moisture regain testing method (oven drying) for textile materials, such as longer testing period, higher energy wastage, laboring intensity, and inefficient, a new instrument i.e. moisture regain rapid testing system has been researched, designed and manufactured for raw silk in this project. This system can record real-time the weight of raw silk sample during the drying in the certain environment oven. The index prediction model has been developed based on the accumulating generation operator (1-AGO) after the data have been pretreated. According to this model, the percent of error is only 2.09% between the predicted value and actual result of raw silk moisture regain within the drying cycle of 40min by the rapid testing system.

Abstract: According to the production characteristics of single piece and small batch production and the combination of production and research in aerospace workshops, this thesis has made an in-depth study of job-shop manufacturing execution process monitoring technology with strong adaptability. A model for visual manufacturing process monitoring based on process route was proposed, it realizes the job-shop production featured by entire staff participation, entire process management and omnibearing warranty.

Abstract: In electronic flexible printed circuit (E-FPC) manufacturing procedure, the cover laminating process in which the line circuit (copper wire) is covered with hot cover layer on the printed circuits is importance process. This process will help to increase elasticity, strength and corrosion protection to the product therefore this process can affect directly to quality of the printed circuit. The process for laminating printed circuits can be classified into two methods by coating with industry iron and hot bar machine. This article compares the quality of the electrical circuit between industry iron and hot bar machine methods in the cover coating process by using Peeling Strength to indicate the quality in the same temperature and time condition. The experimental result illustrates the electrical circuits using the hot bar machine method give Peeling Strength value in the acceptable range and the laminating surface of circuits is smooth and uniform. On the other hand, Peel Strength value of electrical circuits using the industry iron method is unsteady and lower than the acceptable range. Moreover the result circuit product has wrinkled coating surface and become the waste product.

Abstract: Based on the method of vector analysis, the mathematical model of squeegee roller for twist drill groove was setup. At the same time, the parameter design and simulation software for the profile curve of drill groove squeegee roller was developed with Visual C++ Language. The simulation results showed that the mathematical model of squeegee roller was right, and the design accuracy and efficiency of the twist drill squeegee roller was improved greatly.

Abstract: Closed-Loop PLM is the development direction of product management in the future. Network platform is the indispensable means for realizing closed-loop. It could be concluded that the Internet Things can be the network platform of C-L PLM by analyzing the circulation data, data distribution, and hardware and software configuration. The connection method of EPCglobal network and C-L PLM was designed, based on analyzing them belonging to the same standard frame.

Abstract: This paper puts forward a simulation program of crystal growth, using TSSG method which is based on the finite element simulation technology. The core program FETSSG is developed on the basic of the finite element analysis software ANSYS. By using this program, we can simulate the process of crystal growth in all kinds of process conditions, and the numerical results include the single crystal furnace temperature field and fluid flow velocity field. These numerical results are in consistent with the laboratory results, which are valuable to the users.

Abstract: This paper presents a circuit milling system, which integrates CAM functions and gives a good performance for flexibility and changeability. Gerber format files are described and read into some data structures that support centerline shape representation. The pixel based algorithms are used to get contours, get contour-parallel tool paths, detecting uncut regions, and also used to calculate the tool radial compensation. The precision is discussed and is proved feasible for circuit milling. The milling operation is divided into isolating and hollowing operations to make the process planning more flexible. The detailed algorithms of isolating and hollowing are given, which contain contour-parallel offset and direction-parallel tool paths. Hollowing supports multi tools to promote the efficiency. All the processes such as drilling, isolating, hollowing and cutting off are given in detail.

Abstract: Radial-axial ring rolling is an important component of advanced manufacturing technology, but it has characteristics of high nonlinear on geometry and physics, so the radial-axial ring rolling process becomes very complex. In addition, the feeding mode of core roller has enormous influence on the quality of the rolled ring as well as the stability of the process. In this paper, a 3D rigid-plastic FE model of radial-axial ring rolling process is established, then three kinds of feed speed design ((1)constant of feed speed; (2)constant of feed in one rotary; (3)variation of feed speed)are offered. The difference of outer radius growth velocity, distribution of effective strain and temperature, rolling force, size of ring are analysised for the three kinds of feed methods. And, an optimized feed method is proposed base on analytic results, the optimized feed method can improve the quality of formed ring, and decrease the requirement of ring rolling mill.

Abstract: In the present study, the residual stress generated in the crack tip of compact specimens was investigated in order to analyze the effect of residual stress on the creep crack growth. Residual stresses were generated using loading in compression beyond yield and then unloading. The maximum region of residual stress in the crack tip was obtained by numerical simulations which calculated the effect of notch radius and penetrated stress. It was found that a 2.5 mm notch radius with the applied stress at 36 KN could generate the largest extent of residual stress ahead of crack tip in the compact specimen. Further, when the specimen was heated to a high temperature, the value of residual stress reduced while the distribution changed little.

Abstract: The Electrical Mechanical Brake(EMB) is advanced with plenty functions of ABS, TCS and ESP etc. EMB has a very good development prospect for its good reaction speed and reliable performance as well as easy installation maintenance. It is necessary to study the method of design and simulation of EMB. First, the structure, working principle and the related parts mathematical model of EMB were introduced and the mathematical model of motor was built; second, virtual prototype model of EMB was designed in Pro/e software and developed with constraint and parameter set in adams software; finally, we built the co-simulation model of EMB using adams and Simulink and chosen a certain vehicle type to analyze and verify. The result shows that this method is efficient and feasible.