铸造外圆角(摘自JB/ZQ4256—1997)(mm)
| 表面最小 边尺寸P | R 值 |
| 外 圆 角α |
| ≤50° | 51~75º | 76~105º | 106~135º | 136~165º | >165º |
| ≤25 | 2 | 2 | 2 | 4 | 6 | 8 |
| 25~60 | 2 | 4 | 4 | 6 | 10 | 16 |
| 60~160 | 4 | 4 | 6 | 8 | 16 | 25 |
| 160~250 | 4 | 6 | 8 | 12 | 20 | 30 |
| 250~400 | 6 | 8 | 10 | 16 | 25 | 40 |
| 400~600 | 6 | 8 | 12 | 20 | 30 | 50 |
| 600~1 000 | 8 | 12 | 16 | 25 | 40 | 60 |
| 1 000~1 600 | 10 | 16 | 20 | 30 | 50 | 80 |
| 1 600~2 500 | 12 | 20 | 25 | 40 | 60 | 100 |
| >2 500 | 16 | 25 | 30 | 50 | 80 | 120 |
注:⒈P为表面的最小边尺寸。⒉如一铸件按表铸造外圆角可选出许多不同的圆角“R”时,应尽量减少或只取一适当的“R”值以求统一。铸造内圆角(摘自JB/ZQ4255—1997)(mm)
|
| R 值 |
| 内 圆 角 α |
| <50° | 51°~75° | 76°~105° | 106°~135° | 136°~165° | >165° |
| 钢 | 铁 | 钢 | 铁 | 钢 | 铁 | 钢 | 铁 | 钢 | 铁 | 钢 | 铁 |
| ≤8 | 4 | 4 | 4 | 4 | 6 | 4 | 8 | 6 | 16 | 10 | 20 | 16 |
| 9~12 | 4 | 4 | 4 | 4 | 6 | 6 | 10 | 8 | 16 | 12 | 25 | 20 |
| 13~16 | 4 | 4 | 6 | 4 | 8 | 6 | 12 | 10 | 20 | 16 | 30 | 25 |
| 17~20 | 6 | 4 | 8 | 6 | 10 | 8 | 16 | 12 | 25 | 20 | 40 | 30 |
| 21~27 | 6 | 6 | 10 | 8 | 12 | 10 | 20 | 16 | 30 | 25 | 50 | 40 |
| 28~35 | 8 | 6 | 12 | 10 | 16 | 12 | 25 | 20 | 40 | 30 | 60 | 50 |
| 36~45 | 10 | 8 | 16 | 12 | 20 | 16 | 30 | 25 | 50 | 40 | 80 | 60 |
| 46~60 | 12 | 10 | 20 | 16 | 25 | 20 | 35 | 30 | 60 | 50 | 100 | 80 |
| 61~80 | 16 | 12 | 25 | 20 | 30 | 25 | 40 | 35 | 80 | 60 | 120 | 100 |
| 81~110 | 20 | 16 | 25 | 20 | 35 | 30 | 50 | 40 | 100 | 80 | 160 | 120 |
| 111 150 | 20 | 16 | 30 | 25 | 40 | 35 | 60 | 50 | 100 | 80 | 160 | 120 |
| 151~200 | 25 | 20 | 40 | 30 | 50 | 40 | 80 | 60 | 120 | 100 | 200 | 160 |
| 201~250 | 30 | 25 | 50 | 40 | 60 | 50 | 100 | 80 | 160 | 120 | 250 | 200 |
| 251~300 | 40 | 30 | 60 | 50 | 80 | 60 | 120 | 100 | 200 | 160 | 300 | 250 |
| >300 | 50 | 40 | 80 | 60 | 100 | 80 | 160 | 120 | 250 | 200 | 400 | 300 |
| c和h值 | d2/d1 | <0.4 | 0.5~0.65 | 0.66~0.8 |
| c | ≈0.7(d1-d2) | ≈0.8(d1-d2) | ≈d1-d2 |
| h | 钢≈8c | 铁≈9c |
| | | | | | | | |