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Stainless steel hex bolts cause failure

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Stainless steel hex bolts cause failure

Release date:2018-11-05 Author: Click:

Stainless steel hex bolts are fasteners consisting of a head and a screw. The bolts are divided into iron bolts and stainless steel bolts, ie hex head bolts (partial threads) - Class C and hex head bolts (full thread) - Class C. Also known as hex head bolts (rough), hex head bolts, black iron screws.


The connecting rod bolts of diesel engines are single-use and are not allowed to be reused. If the connecting rod bolt is repeatedly used, the bolt is elongated due to the large force, which may cause the bearing bush to burn due to insufficient bolt fastening strength; at the same time, due to insufficient fastening force, the matching gap between the bearing bush and the crankshaft journal The increase causes the oil pressure to be low, causing excessive wear of the bearing bush and causing a burnt tile accident. The diesel engine is a high-enhanced diesel engine. The connecting rod is subjected to a large impact load, which is much larger than that of an ordinary diesel engine. Repeated use of the connecting rod bolt can easily cause breakage and damage the engine cylinder block, resulting in the engine being scrapped. Some units have broken faults despite the replacement of the connecting rod bolts. Some of the connecting rod bolts suddenly break during operation.


Reasons for failure of stainless steel hex bolts:


1 When the assembly is too tight, the torque is not uniform. Since there is no strict torque wrench in the assembly, the specific tightening torque is not well understood, and the tighter the better; the tightening of the connecting rod bolts is longer, the tightening torque is too large, exceeding the bolt material. The yield limit causes the connecting rod bolt to yield deformation so that it breaks due to excessive elongation under the impact load. It should be emphasized that it is necessary to tighten the connecting rod bolts according to the standard. Do not think that the tighter the strength, the better.


2 The connecting rods of diesel engines are divided into various levels. During maintenance, care should be taken not to switch to different levels of connecting rods. If the sloppy handle is messed up or misplaced during the overhaul, the joint of the big joint of the connecting rod will not be tightly fitted, and the connecting rod cover will loosen during the engine running, which will cause the connecting rod bolt to break. The connecting rod of WD615 series diesel engine is obliquely cut, the chamfer angle is 45°, and the joint surface of the connecting rod cover and connecting rod adopts 60° zigzag positioning structure. This structure has close fitting, accurate positioning, reliability and compact structure. specialty. If the connecting rod cover is messed up and misplaced during maintenance, it will inevitably result in poor positioning of the joint surface serration, which may easily cause the loosening of the connecting rod cover during the operation of the engine, resulting in the breakage of the connecting rod bolt.


3 The diesel engine has a fault in the running or the piston burns in the cylinder during operation, and the connecting rod bolt is broken. If the engine has a fault in the running, the engine should be fully inspected. It is best to replace the connecting rod bolts. If there are serious cylinders in the individual cylinders during operation, the connecting rods should also be replaced when replacing the cylinder piston assembly. Replace the bolts.


4 Material problems, machining defects and heat treatment process problems can also cause the connecting rod bolts to break during engine operation.


Stainless steel hex bolt

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