Abstract: One reason for the delay of open-architecture control system in industry action is that no clear and hierarchical design method has evolved. Different application environment and object should have different open levels, applying platforms, system architectures and integration method. Abstract open control concepts or characters must be converted into specific and practical applying objects and contents of one designing of open-architecture CNC system. Then through analysis of the hierarchy or level of system open character, practical system functional objects to be realized, technical and non-technical issues to be considered, implementation contents and process and the method of component and system validation, a hierarchical design method of open modular architecture CNC system is established.
Abstract: A novel general model of the coupled flexible system is presented. Based on the
description of state-space equation of the coupled system, the transmission channels of the power flow transmitted into the foundation are discussed in frequency domain, and then combined into a single function. The transmission characteristics of power flow and control strategies are discussed in detail. From numerical simulations presented, it is clear that the analytical model is effective and
moment controls are able to achieve vibration cancellation substantially.
Abstract: High-speed machining has become mainstream in machining manufacturing industry. In industries such as moldmaking and aerospace, it has become the norm rather the exception. The centrifugal force increases as the square of the speed. At rotational spindle speeds of 6,000 r/min and higher however, centrifugal force from unbalance becomes a damaging factor and it reduces the life of the spindle and the tool, as well as diminishes the quality of the finished product. Under high rotational speed, good balance becomes issue. High-speed machining experimental results shown that a well-balanced tool/toolholder assembly could obviously improve machining quality, extend tool life and shorten downtime for spindle system maintenance etc.
Abstract: This paper proposes a numerical cutting model with the FEM to simulate the temperature field at the contact zone on the tool rake face. The analysis of the tool rake face temperature in orthogonal machining is studied based on heat transfer theory and calculus of variation. Then, the FEM simulation results of the temperature field on the rake face in various cutting speeds and the cutting speeds vs peak temperature curves are given. The results show that the highest temperature of the tool surface is located at a distance nearby the tool tip, and the higher cutting speeds can increase the tool rake face temperature obviously. In addition, the workpiece materials have a great effect on the peak temperatures at the rake face. Therefore, this study is helpful to investigate tool wear mechanism and optimize the machining parameters for the metal cutting processes.
Abstract: This paper presents the implementation of an internet-based facility for the drilling
process simulation, which complies with TCP/IP and is supported by Browser/Server model. The process simulation is one of pivotal technologies and implemental techniques of the internet-based agility manufacturing technology. A network architecture model is developed with the WebServer toolbox of MatLab. The complicated drilling process is studied. Semi-experimental mathematic models of drilling force and torque are established. Users input different machining parameters in client-side and then they will get the simulation curves of cutting forces and torques and can evaluate the simulation results. At last, optimum machining parameters can be chosen by users via internet.
Abstract: A semi-active vehicle suspension model is built, and semi-active suspension control
system based on T-S fuzzy neural control strategy is designed. Then, the stability of the control system is analyzed and the condition of stability of the system is deduced. Simulations and experiments are carried out and their results accord with each other, which shows that the controller is stable, valid and has strong robust performance.
Abstract: Traditional bottleneck diagnosis of production lines mainly relies on the designer’s
experience, theoretical calculation or data analysis after practical system run. There are some disadvantages of the traditional bottleneck diagnosis for production lines. Using the virtual manufacturing technologies, a novel Simulation Diagnosis methodology about the Bottleneck of Production Lines (SDBPL) has been presented. With the proposed method, an existed production line is modeled, simulated and analyzed. Its bottleneck is quickly diagnosed by some ways such as
visual simulation results, cycle time, machine utilization and labor utilization. Results reveal that SDBPL can find the location of bottleneck in the practical production lines without wasting practical resource because the entire course of the diagnosis for bottleneck is implemented in virtual environment, and SDBPL is quicker than that of traditional methods as well.
Abstract: In this article, the relations between the formed shapes and process parameters had been studied for 3D laser forming of sheet metals. The investigation was performed on Stainless 1Cr18Ni9Ti sheet using a Nd:YAG laser source. The scanning strategies were being investigated to potentially achieve a more uniform temporal and spatial distribution of the laser energy, possibly leading to reduced part distortion, by scanning the beam across the sheet surface with both continuous and segmented irradiation geometries. The experimental results revealed that the cross
spider scanning strategy could form square and circle sheets into spherical domes. And the radial lines scanning strategy could form rectangle sheets into saddle shapes. It was also apparent from the experimental results that the height of the center of the formed sheet increased with the increasing of the laser power and scanning numbers. The height of the formed square sheet firstly decreased with the laser scanning velocity increasing and began to decrease at a certain processing parameters by cross spider strategy, in which the circle sheet was opposite with the square sheet, and in which the rectangle sheet decreased with speed increasing.
Abstract: With the development of Information Technolo gy, distributed integrated system of PDM and CAPP has being focused on by many researchers. To enhance the security access control ability of the integrated PDM and CAPP system, an operational model based on attribute certificate with roles was made. It can prevent unknown entity from accessing to the product data in the integrated system. The function framework of security access control system was analyzed in detail. The
function of fine-grained access control system was presented.
Abstract: As the actual design process and CBD process have collateral corresponding relation, CBD accords with the actual design process of deviser. This paper studies the application of CBD technology in product variant design. The basic resolution model of variant design is established, and the instance of products variant design is presented. With the application of variant design principle, the design intensity will be lightened, and the design time will be shortened. Therefore the variant design could accommodate the requirement of product diversification and client orientation.