The shape and connection structure of the high-strength nut are basically the same as that of the ordinary bolt. The main difference between the two is that the ordinary bolt connection relies on the pressure and shear resistance of the rod body to transfer shear force. The pre-tension produced by the bolt when tightening the nut is very small, and its influence is not considered. The working principle of high strength nut connection is to apply a lot of pre-tension to the bolt intentionally, so that there is extrusion pressure between the contact surface of the connecting piece, so there is a lot of friction perpendicular to the direction of the Screw, relying on this friction to transfer the shear force of the connection. The pre-tension of high strength nuts is achieved by tightening the nut, and ordinary high strength nuts generally use torque method and corner method. Torsional shear high strength nuts use torsional bolt tail to control the pre-tension. Carbon Steel Nut,Custom Hex Nuts,Black Zinc Nuts,High Strength Nut Handan Changlan fasteners manufacturing ,.Co ltd , https://www.hdchanglanjgj.com
The bolts connected with high strength nuts are made of grade 10.9s or grade 8.8s high quality alloy structural steel and made by heat treatment. The holes of high strength bolts should be drilled. The aperture of high-strength bolt connected by friction type is 1.5~2.0mm larger than the nominal diameter of bolt D; The aperture of the High Strength Bolt connected by pressure type is 1.0~1.5mm larger than the nominal diameter d of the bolt.
Our factory is a professional factory engaged in gear production. In the production process of gears, in order to ensure the various technical requirements of gears, we must carry out finishing. In the past, our factory (?) snake belly clamps were processed on C7620 hydraulic semi-automatic lathes, although It can also guarantee various technical requirements, but the snake belly sleeve is brittle, and it may be damaged if it is handled with care. This not only increases the cost, but also increases the auxiliary working time, thus reducing the work efficiency. To this end, we have designed a fine car gear fixture