Fasteners are a common type of fastener connection parts in our lives, ranging from screws on watches to large mechanical parts or aircraft bolts and nuts. The use of Railway Fastener is very extensive, but in the process of using it, will you encounter some misunderstandings, such as we no longer have thin bolts, can we use coarse bolts instead? In response to these problems, According to the details of the Railway Fastening System Manufacturer, I can tell you that it is not possible. By summary, when using fasteners, the common misunderstandings are mainly the following, I hope to help everyone.
1.Replace fine teeth with coarse teeth
There are many important connecting parts on the machine, such as drive shafts, etc. Most of the bolts are fine-threaded. If there are missing parts during maintenance, some maintenance personnel will use coarse tooth bolts instead, which should be avoided.
Because the fine bolts have a large internal diameter, a small pitch and external angle, high strength, good self-locking performance, and strong ability to withstand shock, vibration, and load exchange. Once it is replaced with a coarse tooth bolt, it is easy to loosen, detach, disassemble, and even cause a mechanical accident.
2, the pores do not match
The bolts on the machine that are subjected to lateral loads and shear forces, such as drive shaft bolts and flywheel bolts, are mated with the bolt holes as a transitional fit. The assembly should be strong and reliable, and can withstand lateral forces. Some people do not pay attention to the inspection during the assembly process. When there is a large gap between the bolt and the bolt hole, the installation is still continued, which is easy to cause bolt loosening or cutting accidents.
3.Thickened nuts increase connection reliability
Some people mistakenly believe that thicker nuts can increase the number of threads and increase the reliability of the joint. But in fact, the thicker the nut, the more uneven the load distribution between the threads of each circle, and the easier the joint is to loosen.
4.One mother and multiple pads
After the installation is completed, sometimes the bolt is too long, so someone will install an additional spring washer on the bolt. In this case, the spring washer will not be uniformly broken during the strengthening process, so that the bolt's Decreased tightening force may also generate eccentric loads, reducing the reliability of bolted connections.
5. The tighter the screw, the better
Many staff members have such a misunderstanding: they think that the bolts should be "tightened and not loose", so they deliberately increase the tightening torque, which results in the bolts sliding. In addition, some of the important bolts that need to be tightened with torque, but some people use a spanner to save trouble, resulting in insufficient torque, resulting in loose bolts and even mechanical failure.
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