Traian Buidoş

CONSIDERATION ON FLEXIBLE MANUFACTURING CELL MODELING WITH TIMED COLOURED PETRI NETS

This paper presents how color Petri nets can be used in flexible manufacturing system models.. It is studied the cell from the Faculty of Engineering Management and Technology. In this cell process four parts: two pieces of revolution and two prismatic parts. In a first variant coloured Petri nets model is made without taking into account the time factor. This does not allow a prioritization of processing and the evaluation of manufacturing cycle time. If we consider the factor of time, coloured Petri nets model allows prioritization processing by the fact that each color is associated with a part it can be attach timing. May also be taken into account the processing times through timings associated with the transitions.

Design and Realization of a Sound Module for a Miniature Model Steam-Locomotive

This paper shows the main steps to design and realize an original sound module for a miniature model steam locomotive, which produces the adequate sounds and the characteristic steam puffing in synchronization with the wheels of the locomotive. This continues the previous work of the authors concerning the model railroading and the implications of nonconventional technologies in this field of activity.

Design and realization of light modules for miniature model passenger coaches

This paper shows the main steps to design and realize an original light module for miniature model passenger carriages, with the possibility to switch on and off individual lights and to operate the lights according to certain patterns, which improves greatly the visual appearance of miniature passenger trains. This continues the previous work of the authors concerning the model railroading and the implications of nonconventional technologies in this field of activity.

Parametric Design of Gear Hob Cutter

The gears are some of the most used mechanical transmission due to the advantages its provide: constant transmission ratio, high power transmitted, high efficiency, small size, silent operation, precision kinematic, etc. This causes the wheel to be one of the most valuable machine elements both in terms of accuracy and processing technology as well. From the technological point of view due to high precision and productivity, one of the most methods used is processing with gear hob cutter. Although the tool profile does not depend on the number of teeth on the wheel, but only its module, large diversity of gear requires the design of gear hob cutters tailored to existing needs. As it is known the gear hob cutters are complicated and expensive gear cutting tools, both due to the manufacturing process and in terms of design, requiring a significant amount of calculations, high effort from the designer and consequently results in a large cycle of design. For this reason, the literature and in various websites, there are many studies and research information to optimize the design process and increase accuracy of gear hob cutters.

Contributions to the Design of the Load Station Concept Used at the Flexible Manufacturing Cell

The present paper work shows theoretical and practical research for constructive solutions of the load station system for the working parts and tools in order to achieve a flexible manufacturing cell UO-1 that was realized at University of Oradea by retrofitting activity. The constructive solution for load station is new and original and it was designed and effective produced in the Faculty of Engineering Management and Technology Laboratory, in order to be use at the flexible manufacturing cell for the loading and unloading of the working parts and tools by means of ABB robot IRC 1600.

Analysis of the Linear Positioning Accuracy on Z Axis at the Horizontal Machining Centre TMA-AL-550

This paper presents a case study regarding use the laser XL 80 to check the linearity movement of the Z-axis to horizontal machining center, TMA-AL 550. This machining center has been upgraded to the possibility of processing to 3 CNC linear axes and 2 CNC rotary axes (up to 5 CNC simultaneous axes) and also 1 PLC axis (the index table), as well the including of the machine into to the flexible manufacturing cell. This work paper presents the linearity accuracy at machining centre on the Z axis and shows the operating correction parameters by software and the necessity of backlash adjustment between nut and ball screw, by using a performing linear laser for machine tools and research systems laboratory, that was acquired by the project RTT-5 Rotary-Tilting Tables for 5-axis Machining Center, where the authors participated. Compared with conventional methods of checking of table linearity deviations at the machining centers (checking with spirit leveling device, wire collimator, wire auto-collimator and yardstick ruler), the method by laser of unconventional determining brings the following advantages: linear resolution of 0.001 μm, method assisted by computer, in order to obtain the positioning accuracy ± 5 μm the repeatability of 5 μm/m. The measurements fall within the ISO 230-2, ASME B5-52, VDI 3441-DGQ, JIS and GB international standards, and permitting also the memorization of the measured data and the obtaining of the tabulated results, or in graphical form too, using XL 80 soft Laser, by forwarding the information to the computer.