弯头展开计算公式表

系数K2节1.000010.000×DK×(R-0.5D)3节0.414220.196×DK×(R-0.462D)4节0.267930.393×DK×(R-0.354D)5节0.198940.589×DK×(R-0.191D)6节0.158450.785×DK×(R)7节0.131760.982×DK×(R+0.191D)8节0.112771.178×DK×(R+0.354D)9节0.098581.374×DK×(R+0.462D)10节0.087591.571×DK×(R+0.5D)11节0.0787101.767×DK×(R+0.462D)12节0.0715111.963×DK×(R+0.354D)13节0.0655122.160×DK×(R+0.191D)14节0.0605132.356×DK×(R)15节0.0562142.553×DK×(R-0.191D)16节0.0524152.749×DK×(R-0.354D)17节0.0491162.945×DK×(R-0.462D)18节0.0462173.142×DK×(R-0.5D)19节0.0437第一节（第末节）展开图，中间节由2个第一节拼成即可说明：本表适用于90度虾米腰弯头（节数：2～19节）放样展开曲线的坐标计算式中：D-弯头中径；R-弯头弯曲半径；K-弯头节数系数（见右表）弯头中径=外径-壁厚=内径+壁厚（薄壁可忽略不计）90度弯头节数90度虾米腰弯头第一节展开曲线坐标计算公式表YX展开曲线坐标点实用Excel小程序