reverse engineering – recent advances and applications - OpenLibra

More documents

Recommendations

Info

154 Reverse Engineering – Recent Advances and Applications TPOS DRF X Y Material Modifier TPOS DRF X Y � 0.080 |Α|Β|C| 7.000 6.000 - � 0.100 |Α|C|B| 7.000 6.000 - � 0.800 |Α|Β|D| 7.000 51.000 - � 0.100 |Α|C|B| 7.050 6.000 - � 0.080 |Α|C|D| 31.000 6.000 - � 0.100 |Α|Β|D| 7.000 51.000 - �0.080 |Α|D|C| 31.000 51.000 - � 0.100 |Α|C|D| 31.000 6.000 - � 0.100 |Α|Β|C| 7.000 6.000 - � 0.100 |Α|D|B| 31.000 51.000 - � 0.100 |Α|D|C| 31.000 51.000 - Table 6. Set of preferred position tolerances for the application example Material Modifier The preferred 11 out of 751 position tolerances of the Table 6 were obtained applying the selection options and guidelines of the section 4.4. Parallel results were obtained for the other three holes. As it came out, all of them belong to a group of holes with common DRF. The position tolerance size � 0.100mm and the DRF |Α|Β|C|were finally chosen by the machine shop. Theoretical hole location dimensions are shown in Figure 11. The results were experimentally verified and approved. Time needed for the entire task was 12min (CMM) + 6min (Analysis) =18min. The usual trial-and-error way would, apparently, require considerably longer time and produce doubtful results. Reliability of the results can certainly be affected by failing to recognize initial datum features. In machine shop practice however, risk for something like that is essentially negligible. (a) (b) Fig. 11. Case study datums (a) and the selected position tolerance of the case study (b) 6.3 Application example of cost-effective RE tolerancing In the assembly of components A-B-C of Figure 12 the dimension D4 = 74.95 ± 0.25mm is controlled through the dimensional chain, 4 3 ( ) D = sin D D + D + D + D - D - D - D + D 1 2 7 10 with D1 = 190mm, D2 = 15mm, D3 = 45°, D5 = 14mm, D6 = 95mm, D7 = 20mm, D9 = 75mm, D10 = 12mm, D11 = 97mm. Component B is reverse engineered and needs to be remanufactured with main intention to fit and perform well in the existing assembly. All of the original 11 5 6 9
A Systematic Approach for Geometrical and Dimensional Tolerancing in Reverse Engineering component design and manufacturing information is, however, not available and the dimensional accuracy specifications for component B reconstruction have to be reestablished. The machine shop where the part will be manufactured has an IT6 best capability and its DFF processed and the results stored. Alternatives for parts A, C and B, provided by the RE dimensional analysis of Section 3, are shown in Table 7(a) and (b) respectively. The 64 possible combinations of the part B alternatives are filtered out according to the tolerance chain constrains and, as a result, 24 combinations occur for the dimensions and tolerances D5±t5, D6±t6, D7±t7 as shown in Table 8. The optimum combination that corresponds to the minimum accuracy cost is the combination 64. Fig. 12. Application example of Cost-Effective RE tolerancing Alternative 1 Alternative 2 Dmin Dmax Dmin Dmax D1 190.01 190.04 189.97 190.00 D2 14.99 15.02 14.98 15.00 D3 45.01 45.02 44.98 45.00 D7 20.00 20.01 19.99 20.005 D10 12.01 12.025 11.98 12.00 D11 97.00 97.02 96.98 97.025 a/a D5 D6 D9 Dmin Dmax Dmin Dmax Dmin Dmax 1 14.00 14.12 95.03 95.15 74.67 75.23 2 13.89 14.30 94.98 95.11 75.00 75.01 3 13.98 13.99 94.86 94.99 74.77 74.99 4 13.89 14.01 94.95 95.14 74.98 75.10 Table 7. Dimensional alternatives for parts A, C and B 155
Page 1 and 2:
REVERSE ENGINEERING - RECENT ADVANC
Page 5 and 6:
Contents Preface IX Part 1 Software
Page 9 and 10:
Preface Introduction In the recent
Page 11 and 12:
Preface XI and con’s related to t
Page 13 and 14:
Preface XIII the step-by-step appli
Page 17:
Part 1 Software Reverse Engineering
Page 20 and 21:
4 Reverse Engineering - Recent Adva
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
10 Reverse Engineering - Recent Adv
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
58 2. Model driven architecture: An
Page 76 and 77:
Page 78 and 79:
62 Fig. 1. Model, metamodels and tr
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
100 Reverse Engineering - Recent Ad
Page 118 and 119:
Page 120 and 121: 104 Reverse Engineering - Recent Ad
Page 124 and 125: 108 Table 1. Number of smoothers an
Page 133 and 134: 1. Introduction 60 Surface Reconstr
Page 135 and 136: Surface Reconstruction from Unorgan
Page 149 and 150: 1. Introduction A Systematic Approa
Page 151 and 152: A Systematic Approach for Geometric
Page 169: A Systematic Approach for Geometric
Page 177 and 178: A Review on Shape Engineering and D
Page 203 and 204: Integrating Reverse Engineering and
Page 221 and 222:
Integrating Reverse Engineering and
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231:
Part 3 Reverse Engineering in Medic
Page 234 and 235:
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
238 5. Summary and discussions Reve
Page 256 and 257:
Page 258 and 259:
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
268 Fig. 6. A closed polygon mesh r
Page 286 and 287:
Page 288 and 289:
272 3. Results Reverse Engineering
Page 290 and 291:
Page 292:
show all

reverse engineering – recent advances and applications - OpenLibra

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?