采用自制螺栓拉拔器对索夹螺栓进行预紧，更加精确地控制了索夹螺栓的预紧力，确保索夹对主缆的握紧效果。
We use homemade bolt puller to preload the clamp bolt, which more accurately controls the preload of the clamp bolt, and ensures the clamp's holding effect on the main cable.
结晶器是水平连铸工艺中的关键工装部件，其结构直接影响拉拔管材的表面质量。
Crystal instrument is the key part of plane casting, the structure affects directly the surface quality of drawing material.
系统由超声波驱动器、换能器、变幅杆、拉丝模、拉伸机等组成，通过对黄铜丝的拉拔实验，考察了超声振动对拉拔力和丝的表面质量的影响。
Through a series of drawing experiments of brass wires, the effects of ultrasonic vibration on drawing force and surface quality of the wires were discussed.
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