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Common problems and solutions of bolt tightening torque

April 26, 2024

Bolt tightening torque is one of the common key parameters in mechanical engineering, which directly affects the safety and reliability of equipment. However, in practical operation, the control of bolt tightening torque often faces various problems and challenges. This article will explore common problems with bolt tightening torque and propose corresponding solutions to help engineers better master bolt tightening technology.


1. Common issues with bolt tightening torque


(1). Loose bolts: loose bolts are one of the most common problems in bolt tightening torque control. If the tightening torque is insufficient or excessive, it may cause the bolts to loosen. Loose bolts not only affect the normal operation of the equipment, but may also cause safety accidents.
(2). Bolt fracture: when the bolt is subjected to excessive tightening torque, it may break. Broken bolts can lead to equipment failure and even more serious consequences.
(3). Bolt slippage: slippage refers to the phenomenon of slipping between the thread and the nut during the tightening process of the bolt. Slippery teeth not only affect the tightening effect of bolts, but may also lead to bolt failure.
(4). Torque fluctuation: in practical operation, the fluctuation of tightening torque may be caused by factors such as the operator's skill level, tool quality, and friction coefficient. Torque fluctuations can affect the consistency of bolt tightening, thereby affecting the safety and reliability of the equipment.


2. Solution to bolt tightening torque


(1). Choose appropriate bolts and nuts: when selecting bolts and nuts, factors such as material, strength grade, and size should be fully considered. Choosing high-quality bolts and nuts can effectively improve the stability and reliability of bolt tightening torque.
(2). Control the range of tightening torque: when tightening bolts, the range of tightening torque should be strictly controlled. Generally speaking, tightening torque should be calculated based on factors such as bolt specifications, materials, and friction coefficients, and controlled in actual operation.
(3). Use appropriate tightening tools: choosing the appropriate tightening tool is crucial for controlling the tightening torque of bolts. For example, using tools such as torque wrenches or electric tightening machines can more accurately control the size and stability of tightening torque.
(4). Strengthen operational training: improving the operator's skill level can reduce the occurrence of torque fluctuations. Through regular training and practical operations, operators are familiarized with the technical requirements and operating standards for bolt tightening, improving the stability and consistency of the tightening process.
(5). Regular inspection and maintenance: regular inspection and maintenance of bolts and tightening tools can detect and solve problems in a timely manner. For example, checking the tightening condition of bolts, the wear of threads, and the accuracy of tightening tools to ensure the smooth tightening process of bolts.


3. Conclusion
The control of bolt tightening torque is an indispensable part of mechanical engineering. By deeply understanding the common problems and solutions of bolt tightening torque, we can better grasp bolt tightening technology, improve equipment safety and reliability. At the same time, strengthening operational training, selecting appropriate bolts and nuts, controlling the range of tightening torque, using appropriate tightening tools, and regularly inspecting and maintaining measures are also key to ensuring the stability and reliability of the bolt tightening process. In practical operation, we should combine specific situations and flexibly apply these methods to continuously improve the control level of bolt tightening torque.