使用于高強(qiáng)度螺母副中,強(qiáng)度等級(jí)(熱處理后)為10級(jí),配合10.9級(jí)螺栓使用。普通螺栓與高強(qiáng)度螺母的受力性能與計(jì)算方法均有所區(qū)別的。高強(qiáng)度螺母的受力是通過(guò)在其內(nèi)部施加預(yù)拉力P,然后在被連接件之間的接觸面上產(chǎn)生摩擦阻力來(lái)承受外荷載的,而普通螺栓則是直接承受外荷載的。
Used in high-strength nut pair, the strength grade (after heat treatment) is grade 10, used with grade 10.9 bolts. The mechanical properties and calculation methods of ordinary bolts and high strength nuts are different. The force of high-strength nut is to bear the external load by applying the pretension P inside the nut, and then generating the friction resistance on the contact surface between the connected parts, while the ordinary bolt bears the external load directly.
強(qiáng)度螺母連接具有結(jié)構(gòu)簡(jiǎn)單、機(jī)械性能好、可拆卸、抗疲勞、動(dòng)荷載下不松動(dòng)等優(yōu)點(diǎn)，是一種很有前途的連接方式。高強(qiáng)度螺母用專用扳手?jǐn)Q緊，使螺栓產(chǎn)生巨大的可控預(yù)緊力。通過(guò)螺母和墊板，在連接件上產(chǎn)生相同的預(yù)壓力。在預(yù)壓力的作用下，沿連接件表面會(huì)產(chǎn)生很大的摩擦力。顯然，只要軸向力小于這個(gè)摩擦力，構(gòu)件就不會(huì)滑動(dòng)，連接也不會(huì)損壞。這就是高強(qiáng)度螺母連接的原理。
The strength nut connection has the advantages of simple structure, good mechanical properties, detachable, anti fatigue, no loosening under dynamic load and so on. High strength nuts are tightened with special spanner to produce huge controllable preload. Through the nut and the backing plate, the same preload is generated on the connector. Under the action of preload, there will be a lot of friction along the surface of the connector. Obviously, as long as the axial force is less than this friction, the component will not slide and the connection will not be damaged. This is the principle of high strength nut connection.
高強(qiáng)度螺母連接通過(guò)接觸面之間的摩擦來(lái)防止滑動(dòng)。為了使接觸面具有足夠的摩擦力，必須提高夾緊力，增加接觸面的摩擦系數(shù)。構(gòu)件之間的夾緊力是通過(guò)對(duì)螺栓施加預(yù)張力來(lái)實(shí)現(xiàn)的，因此螺栓必須由高強(qiáng)度鋼制成，這也稱為高強(qiáng)度螺栓連接。
High strength nut connections prevent sliding by friction between contact surfaces. In order to make the contact surface have enough friction, it is necessary to increase the clamping force and the friction coefficient of the contact surface. The clamping force between members is realized by pre tension on bolts, so bolts must be made of high strength steel, which is also called high strength bolt connection.
在高強(qiáng)度螺栓連接中，摩擦系數(shù)對(duì)承載力影響很大。試驗(yàn)表明，摩擦系數(shù)主要受接觸面形式和零件材料的影響。為了增加接觸面的摩擦系數(shù)，經(jīng)常使用噴砂和鋼絲刷清潔來(lái)處理連接范圍內(nèi)的部件的接觸面。事實(shí)上，高強(qiáng)度螺母有兩種類(lèi)型：摩擦型和壓力型。
In high strength bolted connections, the friction coefficient has a great influence on the bearing capacity. The results show that the friction coefficient is mainly affected by the form of contact surface and the material of parts. In order to increase the friction coefficient of the contact surface, sandblasting and wire brush cleaning are often used to clean the contact surface of the parts within the connection range. In fact, there are two types of high strength nuts: friction type and pressure type.
摩擦型高強(qiáng)度螺栓承受剪力的準(zhǔn)則是設(shè)計(jì)載荷引起的剪力不超過(guò)摩擦力。
The shear force criterion of friction type high strength bolt is that the shear force caused by design load does not exceed the friction force.
承壓高強(qiáng)度螺栓的設(shè)計(jì)標(biāo)準(zhǔn)是不切斷軸或不壓碎板。此外，高強(qiáng)度螺栓不能重復(fù)使用。
The design standard of high strength bolts under pressure is not to cut off the shaft or crush the plate. In addition, high strength bolts cannot be reused.
