After tightening, the bolts that require locking and loosening must be locked according to the required locking method. There are many ways to lock the bolts, so don't be rumored. It is worth mentioning that the high-strength bolts made of alloy steel generally have self-locking action after tightening to prevent loosening. Such bolts should not be equipped with spring washers and thrust washers when used in special parts, otherwise it will instead It will cause the bolt to loosen. If it is really necessary to install the gasket, a hardened flat gasket should be added. In addition, in actual work, it is often the case that the bolts and the nuts or bolts are welded together with the workpiece after the bolts are tightened. This will cause difficulties for the next inspection and troubleshooting, and will also hurt the connected workpiece, so it is not desirable in actual work.
The parts required to install the flat gasket should be installed according to the specifications. The purpose of installing the flat gasket is mainly to ensure that the surface of the joined workpiece is not deformed and damaged when subjected to a large tightening torque, thereby protecting the surface of the workpiece. When the gasket is installed, the specifications of the gasket should be correct. The improper gasket can not protect or even counteract.
When the original connecting bolt is damaged or lost, the length of the connecting thread of the substitute bolt must reach the length of the connecting thread of the original bolt. The tensile strength and yield limit of the substitute bolt must be greater than or equal to the tensile strength and yield limit of the original bolt. Generally, the head of the bolt has the material mark of the bolt, and the numbers before and after the decimal point indicate the tensile strength and the yield limit of the bolt, respectively. Therefore, the number before and after the decimal point of the substitute bolt material should be greater than or equal to the number before and after the decimal point of the original bolt. It is extremely harmful and undesirable to do what you can do in practice.
The daily inspection and tightening of bolts is a very important task, and should be constantly carried out in practical work. In particular, the automobile is often in a state of motion, and the bolt is subjected to a large transient load, which is easy to cause the bolt to loosen and break. It is easy to cause an accident if the inspection is not performed or the treatment is not timely.
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