As we all know, bolts are used to connect mechanical parts, and they are also very important to the function of machinery. If the bolt connection is not good, it will directly affect the normal operation of the machine. However, what is distressing is that bolts often break in mass production, and many users do not know what factors cause bolts to break. What are the factors that cause bolts to break? How did the bolt break? How many types of factors are there for bolt breakage? Today we will analyze the reasons.
1. The connecting rods of diesel engines are divided into different grades, and care should be taken not to replace connecting rods of different grades during maintenance. If the connecting rod cover is messed up or wrongly installed due to sloppy care during maintenance, it will cause the joint surface of the big end of the connecting rod to not fit tightly, and the connecting rod cover will become loose during engine operation, resulting in the breakage of the connecting rod bolts. The large end of the connecting rod of wd615 series diesel engine is obliquely cut, and the oblique angle is 45°. The joint surface of the connecting rod cover and the large end of the connecting rod adopts a 60° zigzag positioning structure. This structure has the advantages of tight fitting, accurate positioning, reliability and compact structure. specialty. If the connecting rod cover is messed up or installed incorrectly during maintenance, it will inevitably cause poor positioning of the joint surface serrations, which will easily cause the loosening of the connecting rod cover during engine operation, resulting in the breakage of the connecting rod bolts.
2. When assembling, the tightening torque is too large and the force is uneven. Since there is no strict matching torque wrench in the assembly, and the specific tightening torque is not well understood, I think the tighter the better, the longer the booster rod is used to fasten the connecting rod bolts, the tightening torque is too large, exceeding the bolt material The yield limit causes the connecting rod bolts to yield and deform, causing them to break due to excessive elongation under the action of impact loads. It should be emphasized that the connecting rod bolts must be tightened according to the standard, and never think that the tighter and the greater the strength, the better.
3. When the diesel engine is running, there is a speeding failure or the failure of the piston burning in the cylinder, and the connecting rod bolts are pulled off. If the engine has a speeding failure during use, a comprehensive inspection of the engine should be carried out. It is best to replace the connecting rod bolts. If some cylinders have serious scuffing during operation, the connecting rod should also be replaced Bolt replacement.
Summary: When we use bolts, we basically cause the bolts to break without knowing it. When this happens, it happens when the bolts are used at high speed. My personal suggestion is that every bolt In other words, each type of bolt basically has its own range of weight or heat. When these uncertain factors lead to the range of the bolt itself, the bolt will break or twist or even melt. As far as the bolt is in production or the root cause of the bolt breakage encountered in our various fields.
Chuangtuo Jinggong (Jiangsu) Co., LTD is profession manufacturer of various types of Hexagon Nuts, everything is customized in our factory, Should you have any questions please feel free to come back to us.
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