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由于某种原因影响,使螺栓预紧力(最初给予螺栓连接件的紧固力)下降的现象叫做螺栓的松弛。松弛大致可分为如下两类。 1.螺栓无返回回转产生的松弛:①初期松弛;②沉陷松弛;③轻微磨耗引起的松弛;④密封材料永久变形引起的松弛;⑤过大的紧固力引起的松弛;⑥热的原因引起的松弛。在上述各种松弛中,除第6种情况外,都是由于螺栓连接各部分的各种永久变形以及磨耗使得螺栓的弹性伸长量减少,从而引起预紧力下降。其中,初期松弛是指螺栓的配合部位、座面部位,以及
For some reason, the reduction in bolt preload (the initial tightening force on the bolt connection) is called a looseness of the bolt. Relaxation can be broadly divided into the following two categories. 1. Bolt no return Swing generated relaxation: ① initial relaxation; ② subsidence relaxation; ③ slight wear caused by relaxation; ④ seal material permanent deformation caused by relaxation; ⑤ excessive fastening force caused by relaxation; ⑥ cause of the heat caused The relaxation. Among the various types of slack mentioned above, except for the sixth case, the pretension force is reduced due to various permanent deformations and wear of the various parts of the bolt connection resulting in the reduction of the elastic elongation of the bolt. Among them, the initial relaxation refers to the bolt with the seat area, seating area, as well