03398nam a2200445 4500 20260817173136.0 th eng .b11711383 AIT Thesis no. ISE-97-16 Ha Tien Dung Collision detection for the setup sequencing of bending operations Bangkok : Asian Institute of Technology, 1997 67, A9, B5 p. Thesis ; no. ISE-97-16 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies Thesis (M.Eng.) - Asian Institute of Technology, 1997 In this study, a collision detection algorithm for the verification of setup sequences of bending operations is developed. The sheet metal part is represented by a set of thin flanges and bending axes. The bending relations and reference relation between flanges are represented by a connectivity matrix. The geometric modification of the sheet metal part corresponding to bending operations are calculated. The press brake machine is modeled geometrically by means of a number of convex polygon-extruded polyhedra in three dimensional space. Tools (punch and die) are each represented by a polygon-extruded polyhedra. Verification for possible collisions during bending operation is carried out by detecting any intersections between the polygons representing flanges of the sheet metal part and polyhedra representing components of the machine and tools. Several levels and procedures of the collision detection algorithm attempt to improve the speed of collision checking. A collision detection for bending operation program has been implemented on a PC' platform using Pascal language. The developed algorithm is found to be very fast in detecting the collisions that may be occur during the bending operation. Some case studies illustrate the efficiency of the program. Bending Sheet-metal work Duflou, Joost R., Chairperson Pastijn, Hugo, Examination committee Anulark Pinnoi, Examination committee The Royal Belgian Government, Scholarship donor Asian Institute of Technology. Thesis ; no. ISE-97-16 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14326 .b11711383 mnait y 250422 0 980520 m a y 0 mnait mnait mnarc mnarc 20 40 Barcode : 30050120816169 CREATED : 1998-05-20 RECORD # : i12068536 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120816151 CREATED : 1998-05-20 RECORD # : i12068548 LPATRON : 1010621 LCHKIN : 1999-08-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160099007 CREATED : 2016-04-28 RECORD # : i12960263 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120928931 CREATED : 2019-12-19 RECORD # : i13242969 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 18883 18883 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. ISE-97-16 30050120816169 2026-08-17 17:31:36 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. ISE-97-16 30050120816151 2026-08-17 17:31:36 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. ISE-97-16 30050160099007 2026-08-17 17:31:36 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. ISE-97-16 30050120928931 2026-08-17 17:31:36 3 2026-08-17 20