问题
问答题
根据表1所列已知条件，写出螺距并计算出螺纹中径d2、内螺纹小径D、牙型高度，填入表中。
表 1
| 序号 | 螺纹代号 | 螺距P | 螺纹中径d2 | 内螺纹小径D1 | 牙型高度h1 |
| 1 | M12 | ||||
| 2 | M48×2 | ||||
| 3 | M16 | ||||
| 4 | M36×3 |
答案
参考答案：M12、(2)M48×2、(3)M16、(4)M36×3
(1)P=1.75mm
d2=d-0.6495P=12mm-0.6495×1.75mm
=10.863mm
D1=d-1.0825P=12mm-1.0825×1.75mm
=10.106mm
h1=0.5413P=0.5413×1.75mm=0.9mm
(2)p=2mm
d2=d-0.6495P=48mm-0.6495×2mm
=46.701mm
D1=d-1.0825P=48mm-1.0825×2mm
=45.835mm
h1=0.5413P=0.5413×2mm=1.082mm
(3)P=2mm
d2=d-0.6495P=16mm-0.6495×2mm
=14.701mm
D1=d-1.0825P=16mm-1.0825×2mm
=13.835mm
h1=0.5413P=0.5413×2mm=1.082mm
(4)P=3mm
d2=d-0.6495P=36mm-0.6495×3mm
=34.051mm
D1=d-1.0825P=36mm-1.0825×3mm
=32.753mm
h1=0.5413P=0.5413×3mm=1.623mm