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84 Marius Ionuţ Rîpanu et al. The objective of this paper is to elaborate a comparative study upon the nesting for the classical presses and nesting for the numerical commanded centres in order to emphasize the advantages and the disadvantages of both operations and, not the last, based on the effectuated researches, to obtain high quality and high precision parts at the smallest cost possible. 2. Particularities of the Nesting Operation The cold plastic forming researches and especially the nesting for numerical controlled pressing centres researches made by J a c k s o n and M i t t a l [2] are based on blanking-punching using a very well planned algorithm, method that leads to the automatical generation of the CNC program. R a g g e n b a s s and R e i s s n e r [2] have researched the connection between pressing and laser, with applicability on the processing centres with CNC. In Twente University was studied and developed the processing of the metal sheets domain through planning and managing the factors that influence the machinability of metal sheets using NC [2], [3]. Some of the most important CAD/CAM programs that are used to perform this technological process are: RADAN, WICAM, Nesting Software, EditCNC, CNCezPRO TM , and some of the pressing centre with NC are TRUMPF, AMADA ARIES, Finn-Power, Mazak, Bystronic, etc. The nesting of the blanks for classical presses takes into account certain coefficients that depend on the nature of the material, the placing of the part and the nesting style of it (with waste, without waste, with little waste). During the nesting of the parts for the NC pressing centres it must be taken into consideration the type of the material of the metal sheet. The software used for modelling, simulating and generation of the numerical control scheme will consider all the factors and parameters that may influence the process productivity. 3. Comparative Study For this study was chosen a pinchbeck part made of CuZn15, SR EN 1653:2003, having the configuration from Fig. 1 and the thickness of 1 mm. The processing of this part was followed both for the classical presses and the CNC pressing centres. For the classical nesting, three variants of placing were considered, as in Figure 2. For those variants were calculated the coefficients with values of 53.77%, 54.16 % and 30.75%. In case of using the NC cutting centres, CAD/CAM software were used in order to realise and integrate the designing, modelling, simulating, planning and development functions of the CNC program for processing the metal sheet, choosing the optimum cutting variant with minimum waste.
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 85 Fig. 1 – The processed part. a) b) c) Fig. 2 – Nesting variants. In the present case, for cutting the 6.6 m 2 of the metal sheet, it was chosen the RADAN software of designing, modeling and simulating with the AMADA ARIES 245 pressing center. Following there are presented some sequences of the program that calculated and cut the part from Fig. 1.
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BULETINUL INSTITUTULUI POLITEHNIC D
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