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88 Marius Ionuţ Rîpanu et al. There are presented a part of the steps of the processing program. The generated program processes a number of 98 pieces from a 3000 x 1500 mm sheet metal. At the end, as it is noticeable, the program shows exactly the number of program blocks, the number of tool changes, the programmed stops and the run time. Line43: B2 Line44: N43X – 2.5Y119.5T12 Line45: N44Y40.5 Line46: N45X202.5 Line47: N46Y119.5 Line48: N47X407.5 Line49: N48Y40.5 Line50: N49X612.5 Line51: N50Y119.5 Line52: N51X817.5 Line53 N52Y40.5 Line54: N53G98X17.5Y59.98I205.J0.P3K0 Line56: N55G98X201.5Y162.52T1 called from Line 61 Line57: N56G72X – 2.Y40.02 called from Line 61 Line58: N57G66I204.J0.P – 85.Q – 5. called from Line 61 Line59: N58M00 called from Line 61 Line64: N63G98X17.5Y100.I0.J0.P0.K0 Line65: N64G50 Amada Aries 245(RA1) Verification Analysis Total number of program blocks 65 Total number of program characters 25 544 Number of sub programs 0 Number of tool changes 3 Number of programmed stops 4 Number of repositions 0 Run time 1813 secs = 30.21 min. In the figures below are presented the steps that must be covered in order to cut the part. Therefore, in Fig. 3, there are presented the processing centres that use the RADAN software. From these ones, it was chosen for the part to be cut using the AMADA ARIES 245, using as well the specified material with 1 mm thickness. In figure 4, based on the part geometry and dimensions, are presented four types of standard metal sheets that may be processed by the machine. There are also presented the usage coefficients of the material and the exact number of
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 89 parts that may result from the process and the number of metal sheets that are needed to cover the approximately 6.6 m 2 . It is noticeable that the coefficient of utilization of the material varies based on the dimensions of the sheet and the number of parts increases proportionally with the sheet dimensions. In Fig. 5 is presented the placing of the part on the metal sheet, the anchorage of the metal sheet on the pressing centre and the distances between the pieces that are about to be cut. In the last figure, Fig. 6 is presented the technological flow of cutting and the modality in which the tool approaches and clips step by step the part. 4. Conclusions 1. The CNC pressing centres are much more efficient than the classical pressing methods, the evidence of this fact being the calculation made for the two types of processing of blanks and the coefficient of utilization of the material. 2. For the CNC pressing centres the coefficient of utilization varies depending on the dimensions of the metal sheets while, for the classical pressing, if it would have been used a longer metal strip the usage coefficient would have been the same. I this case it is more appropriate to use a CNC pressing centre. 3. The number of parts obtained from CNC pressing centres is much higher than the number of parts obtained with the classical presses. 4. The CNC pressing centres are characterised by the easiness of calculation at changing the setting of a parameter that has direct influence over the processing of the blanks, due to the presence of the CAD/CAM system presented. 5. An important advantage of the CNC pressing centres, unlike the classical presses, at the processing of simple configuration parts (like the one presented above) is the geometry and the fabrication costs of the tools used in production. Received: March, 22, 2010 1 “Gheorghe Asachi” Technical University, Department of Machine Manufacturing Technology, e-mail: ripanumariusionut@yahoo.com 2 S.C. BMTech S.R.L of Vladeni, Iasi – Romania, e-mail: andrei.weingold@bmtech.ro
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BULETINUL INSTITUTULUI POLITEHNIC D
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CONSTANTIN CHIRIȚĂ, ADRIAN HANGAN
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