The cause of engine crankshaft fracture

After long-term use of the crankshaft, especially after the burning of tiles or ramming, accidental bending will occur. The cold crankshaft should be removed for cold pressure correction. Due to the plastic deformation of the internal metal of the crankshaft during the correction, a great deal of additional stress will be generated, thereby reducing the strength of the crankshaft. If the cold competition is too large, the crankshaft may be damaged or cracks may occur. This type of crankshaft installation will soon be broken. Buy crankshaft can not be coveted cheap, must purchase from the formal channels. Before installing the machine, it should also be carefully checked. If there is any problem, it should be promptly replaced or returned. In addition, when the engine is overhauled, the crankshaft should be subjected to magnetic flaw detection or immersion oil knocking inspection. If the journal surface has an axial crack that is radial or extends to the rounded shoulder, the crankshaft can no longer be used. In order to prevent the crankshaft breakage, the following measures can be taken during maintenance: First, before repairing the crankshaft, check whether the crankshaft has cracks. Pay special attention to the fillet transitions. If any cracked shaft is to be scrapped. When grinding the journal, the journal and the crank arm should be maintained with a certain fillet radius, and the fillet radius must not be arbitrarily reduced. The surface finish of the fillet should be taken care of, otherwise the stress concentration will be caused, and the crankshaft will be broken next. When the journal size wear exceeds the limit, it is better to recover the less impact on the journal fatigue strength as much as possible. If the spraying method is used to reduce the fatigue strength of the journal, it is less, and when the surfacing method is used to recover, the fatigue strength is reduced. The magnitude is larger. Then, the gap and end clearance of each journal and bearing should be in accordance with the standard, the clearance is too large, and the crankshaft is easily damaged due to impact. If the clearance is too small, the crankshaft may be broken due to the shaft holding. In terms of assembly, the ignition timing should be accurate, not too early or too early, pay attention to the balance of the crankshaft, flywheel and clutch.

Socket-weld pipe flanges are typically used on smaller sizes of high pressure pipes. These pipe flanges are attached by inserting the pipe into the socket end and applying fillet weld around the top. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe.

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