Explicació dels termes HRA, HRC, HV
1，La broca HRA és un cos cònic de diamant de 120 + -0,5 °, amb una curvatura superior de 0,2 + -0,002 mm i una càrrega de 60 kg.
2， La broca HRC és un cos cònic de diamant de 120 + -0,5 °, amb una curvatura superior de 0,2 + -0,002 mm i una càrrega de 150 kg.
3, superfície diagonal HV de broca de diamant de piràmide quadrangular de 136 °, el valor de duresa és la pressió específica a l'àrea de la unitat de sagnat, la càrrega és de 50/100 grams de força, l'àrea de sagnat és de diversos um, el valor és kg/mm
| HV | HRC | HRA | HV | HRC | HRA | HV | HRC | HRA |
| 1700,0 | 80,5 | 92,5 | 528,0 | 51.0 | 76,0 | 31.0 | 66,0 | |
| 1600,0 | 80,0 | 92,0 | 513.0 | 50,0 | 76,0 | 301.0 | 30,0 | 66,0 |
| 1550,0 | 79,0 | 91,5 | 498,0 | 49,0 | 76,0 | 29.0 | 65,0 | |
| 1500,0 | 78,0 | 91,0 | 48.5 | 75,0 | 28.5 | 65,0 | ||
| 1450,0 | 77,0 | 90,5 | 485,0 | 48,0 | 75,0 | 285,0 | 28.0 | 65,0 |
| 1400,0 | 76,0 | 90,0 | 47.5 | 74,5 | 27.5 | 64,5 | ||
| 1350,0 | 75,0 | 89,5 | 471,0 | 47,0 | 74,0 | 27.0 | 64,0 | |
| 1300,0 | 74,0 | 89,0 | 458,0 | 46,0 | 73,5 | 26.5 | 64,0 | |
| 1250,0 | 73,0 | 88,5 | 45,0 | 73,0 | 271,0 | 26.0 | 64,0 | |
| 1200,0 | 72,0 | 88,0 | 446,0 | 44.5 | 73,0 | 25.5 | 63,5 | |
| 1150,0 | 71,5 | 87,5 | 435,0 | 44,0 | 73,0 | 25.0 | 63,0 | |
| 1140,0 | 71,0 | 87,0 | 43.5 | 72,5 | 24.5 | 63,0 | ||
| 1076.0 | 70,0 | 86,5 | 43,0 | 72,0 | 257,0 | 24.0 | 62,5 | |
| 1004.0 | 69,0 | 86,0 | 413,0 | 42,0 | 72,0 | 23.5 | 62,0 | |
| 942,0 | 68,0 | 85,8 | 41.5 | 71,5 | 23.0 | 62,0 | ||
| 894,0 | 67,0 | 85,0 | 41,0 | 71,0 | 22.5 | 62,0 | ||
| 854,0 | 66,0 | 84,5 | 40.5 | 70,5 | 22.0 | 62,0 | ||
| 820,0 | 65,0 | 84,0 | 393,0 | 40,0 | 70,5 | 21.5 | 61.5 | |
| 789,0 | 64,0 | 83,5 | 39.5 | 70,0 | 21.0 | 61,0 | ||
| 763,0 | 63,0 | 83,0 | 39,0 | 70,0 | 20.5 | 61,0 | ||
| 739,0 | 62,0 | 82,5 | 38.5 | 69,5 | 236,0 | 20.0 | 61,0 | |
| 716.0 | 61,0 | 82,0 | 373,0 | 38,0 | 69,0 | 223,0 | 19.5 | 60,5 |
| 695,0 | 60,0 | 81,5 | 37.5 | 69,0 | 217,0 | 19.0 | 60,0 | |
| 675,0 | 59,0 | 81,0 | 37,0 | 69,0 | 18.5 | 60,0 | ||
| 655,0 | 58,0 | 80,5 | 36.5 | 68,5 | 209,0 | 18.0 | 60,0 | |
| 636,0 | 57,0 | 80,0 | 353,0 | 36,0 | 68,0 | 205.0 | 60,0 | |
| 56.5 | 79,5 | 35.5 | 68,0 | 197,0 | 59,0 | |||
| 617,0 | 56,0 | 79,0 | 35,0 | 67,5 | 195,0 | 58,0 | ||
| 598,0 | 55,0 | 78,0 | 334,0 | 34.5 | 67,0 | 191,0 | 57,5 | |
| 580,0 | 54,0 | 78,0 | 34.0 | 67,0 | 186,0 | 56,0 | ||
| 562,0 | 53,0 | 78,0 | 33.5 | 67,0 | ||||
| 545,0 | 52.0 | 77,0 | 317,0 | 32.0 | 67,0 | |||
| 51.5 | 76,5 | 31.5 | 66,0 |
Hora de publicació: 18-abril-2024