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標題: 誰能翻一下，螺栓螺母相關 [打印本頁]

作者: pengzhh 時間: 2014-3-26 14:49
標題: 誰能翻一下，螺栓螺母相關
本帖最后由 pengzhh 于 2014-3-26 15:00 編輯

Does it matter whether you tighten the bolt head or the nut?

Normally it will not matter whether the bolt head or the nut is torqued. This assumes that the bolt head and nut face are of the same diameter and the the contact surfaces are the same (giving the same coefficient of friction). If they are not then it does matter.

Say the nut was flanged and the bolt head was not. If the tightening torque was determined assuming that the nut was to be tightened then if the bolt head was subsequently tightened instead then the bolt could be overloaded. Typically 50% of the torque is used to overcome friction under the tightening surface. Hence a smaller friction radius will result in more torque going into the thread of the bolt and hence being over tightened.

If the reverse was true - the torque determined assuming that the bolt head was to be tightened then if the nut was subsequently tightened - the bolt would be under tightened.

作者: pengzhh 時間: 2014-3-26 14:58
不好意思，粘貼上去沒看仔細

作者: 亂影l(fā)yy 時間: 2014-3-26 15:06
Does it matter whether you tighten the bolt head or the nut?
緊螺栓或者螺母有什么關系么
Normally it will not matter whether the  bolt head or the nut is torqued.
一般來說不會。
This assumes that the bolt head and nut face are of the same diameter and the the contact  surfaces are the same (giving the same coefficient of friction).
當然這是建立在螺栓和螺母的作用面尺寸相同的假設之下。(即摩擦系數(shù)相同)
If they are not then it does matter.
如果不是，緊誰就是有影響的。
Say the nut was flanged and the bolt head was not.
比如螺母是帶法蘭的，而同時螺栓不帶。
If the tightening torque was determined assuming that the nut was to be tightened then if the bolt head was                   subsequently tightened instead then the bolt could be overloaded.
這時候，如果實際鎖緊的扭矩是按鎖緊螺母需要的扭矩來決定的，而隨后卻用這個扭矩去緊了螺栓，那么螺栓就過載了

Typically 50% of the torque is used to overcome friction under  the tightening surface.
一般來說，50%的扭矩被用來克服鎖緊面的摩擦

Hence a smaller friction radius will  result in more torque going into the thread of the bolt and  hence being over tightened.
因此，小的摩擦半徑會導致更多的扭矩給到螺栓上，以至其被鎖的過緊了。
If the reverse was true - the torque determined  assuming that the bolt head was to be tightened then if the  nut was subsequently tightened - the bolt would be under tightened.
反過來說也一樣，如果在那種情況下（即上述螺母有法蘭而螺絲沒有）的實際鎖緊的扭矩是按鎖緊螺栓需要的扭矩來決定的，而隨后卻用這個扭矩去緊了螺母，那么螺栓就沒鎖緊。

作者: pengzhh 時間: 2014-3-26 15:31
非常感謝，沒有很好的理解————If the tightening torque was determined assuming that the nut was to be tightened then if the bolt head was subsequently tightened instead then the bolt could be overloaded.
這時候，如果實際鎖緊的扭矩是按鎖緊螺母需要的扭矩來決定的，而隨后卻用這個扭矩去緊了螺栓，那么螺栓就過載了——————這句話，所以我糾結(jié)半天，現(xiàn)在好了，你翻譯后我豁然開朗，謝謝

作者: pengzhh 時間: 2014-3-26 16:25

pengzhh 發(fā)表于 2014-3-26 15:31 / {% d# D! W' y6 G3 ^% k
非常感謝，沒有很好的理解————If the tightening torque was determined assuming that the nut was to ...

哈哈哈，還是要謝謝你

作者: 道士3141 時間: 2014-3-27 15:25
這個貌似太專業(yè)了。。。
基本很少用扭力扳手，也就提不到用規(guī)定的扭矩去鎖緊
不過這個想法真是不錯，鎖不同部件要求的鎖緊力不一樣，為省力，還是鎖螺栓比較好是嗎

作者: pengzhh 時間: 2014-3-27 15:35

道士3141 發(fā)表于 2014-3-27 15:25
% D, _! `) U7 Y* [這個貌似太專業(yè)了。。。
* f& |3 e+ W% a. }1 R基本很少用扭力扳手，也就提不到用規(guī)定的扭矩去鎖緊$ f, v; s6 n& {; T, [& c- b
不過這個想法真是不錯，鎖不 ...

其實看一下螺栓連接的力分配圖就會發(fā)現(xiàn)，摩擦面積的大小導致實際分配到螺桿的力不同，所以螺栓連接真正得到的扭距就不同。我們公司的所有擰緊都是按照扭距來得

作者: 道士3141 時間: 2014-3-31 16:29

pengzhh 發(fā)表于 2014-3-27 15:35
1 b* t: J: L& u. V: w: \其實看一下螺栓連接的力分配圖就會發(fā)現(xiàn)，摩擦面積的大小導致實際分配到螺桿的力不同，所以螺栓連接真正得 ...

專業(yè)啊，以前外國公司也多次要求裝配部門配備扭力扳手，按要求扭矩去扳，于是就去買了兩個，但裝配部并不熱心用，技術部門也沒安排專人去指導，幾個領導可能商量了一下，終于還是不了了之了

作者: dick3848 時間: 2017-9-18 14:37
真是藏龍臥虎啊

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