Applied Mechanics and Materials Vol. 309

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.

Abstract: Stochastic Markov process is formulated for a system of independent production machines with few redundant units in cold, warm or hot standby regime. The disposable repair capacity is restricted. Resulting system of Kolmogorov-Chapman differential equations is solved numerically for different configurations of the production system. Time evolution is relatively insensitive on the renewal capacity and the number of redundant units. The steady state is completely determined by the ratio of failure and the repair rate. Effectiveness of the system as measured by the volume of production is markedly influenced also by such factors as are the renewal capacity and the number of redundant units.

Abstract: In this paper is described the design methodology of clamping fixture with the foolproofing capability. This capability eliminates the wrong work piece inserting and positioning in the clamping fixture. This methodology includes the work piece classification by its symmetry. To work piece symmetry evaluation are used the rotational and mirroring transformations. In the explored area of symmetrical transformations interactions we put the foolproofing pins, or switches.

Abstract: In this contribution is presented design of camera system location at the station for loading and orientation at the intelligent assembly cell. This intelligent cell is situated at the Institute of Production System and Applied Mechanics. The complex design of camera system is going out the intelligent manufacturing systems knowledge. The cell is used for assembly pneumatic actuators. These actuators are consisting of four parts. These parts - semi products of pneumatic actuators are transported from station for loading and orientation, shelf storage system to the workplace of intelligent assembly cell. At the station for loading and orientation is designed camera system for identification assembly parts (rollers and pistons).

Abstract: Modern machining processes continuously face cost pressures and high quality expectations. To remain competitive a company must continually identify cost reduction opportunities in production, exploit economic opportunities, and continuously improve production processes. A key technology that represents cost saving opportunities related to cooling lubrication, and simultaneously improves the overall performance of cutting operations, is dry machining. The elimination of coolants or significant reduction in cooling lubricants affects all components of a production system. A detailed analysis and adaptation of cutting parameters, cutting tools, machine tools and the production environment is mandatory to ensure an efficient process and successfully enable dry machining. Case study is shown for examination of cylindricity error and surface roughness of helical milling machined surfaces by environmentally conscious way.

Abstract: mproving of cutting process is one of the most important requirements that are expected from the machining methods in the recent years. In some machining processes, the positive effect of ultrasonic waves to improve the cutting process is used. The cutting process efficiency depends on the structure of excitation system which generates ultrasonic waves. One of the most important elements of this system is the ultrasonic waveguide. The role of waveguide is the transfer of ultrasonic vibration energy from ultrasonic transducer to the tool cutting edge interacting with the workpiece (ultrasonic assisted machining-UAM). The UAM system performance depends on well-designed ultrasonic waveguide. The most important aspects of waveguide design are a resonant frequency, amplification factor and the determination of waveguide resonant wavelength - usually integer multiple of half wavelength. The effect of geometrical parameters of stepped waveguide on dynamical properties is presented in this paper.

Abstract: The friction processes as the most often physical phenomena cause many negative effects in production systems, and man try to minimize them. Coefficient of friction is one of the fundamental parameters which characterizes the process of friction between two parts, which perform mutual sliding of movement. Its measurement is realised using the experimental methods. In our experiments motion of samples is enforced motorically and various measurement sensors that monitor variables characterizing the process of friction are used. Experimentally obtained values of the coefficient of friction for the bushing aluminium - steel pairs are analysed in the paper. During the run up the value of the coefficient of friction sharply decreased from 0.8 to size 0.1 and then was stable till the end. Experimental tests were realised on the equipment Tribotestor M' 89, which was used for determination of the tribological parameters of bearing bushings. Following input variables were adjusted: the sliding speed, loading of rotanional sliding joint and duration of the test. The temperature in the contact surface of bushings and the roughness parameters (Ra, Rz) were also monitored before and after the tests.

Abstract: Operation analysis one of the system scientific disciplines closely related to system engineering. This discipline is part of praxeology. Praxeology deals with the research effectiveness of the procedure methods for all areas of human activity. The aim of this analysis is creating solved situation model and their optimization. Optimization is model extremes finding. There are model parameters values that output achieved minimum or maximum. Competitive environment is the reason for finding optimal solutions in the production process.

Abstract: Because of the need of expanding the intelligence, functionalities and capabilities of an IMC at the IPSAM, in this paper the authors summarize the process of inserting, programming and using a new ABB robot (IRB 120) for the activities of palletizing and despalletizing of parts and pieces in such a cell. Together with all this, it is also presented a description of the material flow where this robot will be part of so as to better understand its role and interconnections with the remaining devices of the cell. Furthermore, through all the paper several graphics and technical specifications are also given for the sake of comprehension.