空心抽油杆锻模设计

Design of forging die for hollow sucker rod

为了满足采油作业对空心抽油杆之急需，根据空心抽油杆模锻时金属塑性变形的特点，论述了管坯中部镦锻的成形条件及采用φ36mm管坯锻造空心抽油杆的工艺方案：采用倒锥模膛以减小金属在心轴与凹模之间流动的阻力，并降低心轴的脱模力；成形工步的分模面取在凸台处，并采用较小的变形长度与壁厚之比，以保证凸台成形时内壁不产生塑性失稳。所设计的锻模在试生产中获得了满意的效果。

According to the characteristic of metal plastic deformation in forging the die for hollow sucker rods, the forming condition for upsetting of the middle part of the tube billet is expounded, and the technological process for forging hollow sucker rod by using φ36mm tube billet is presented: the back taper die cavity is adopted to reduce the metal flow resistance between the mandrel and the die cavity and decrease the mandrel extraction; the die division plane is setting on the flange in the forming step and minor deforming length-wall thickness ratio is adopted to avoid plastic instability of the inner wall. Satisfactory effect has been achieved by using the forve-mentioned forging die.