The Analysis Of Great Rolling Mill's Herring-bone Gear Hurt And The Suggestion Of Repairing

Main lambdoidal transmission gear of the great girder rolling mill is the key machine of this system.. It's belongs to big modulus wide gear enduring heavy loads so it's surface is easy to be hurt. In the last 2 decades drop corroding, desquamating and distortion had happened in a few sets of 950/850/800 main lambdodial transmission gear located in rolling mill plant of PanZhihua steel&iron factory. That's a hidden trouble for the safe running of machine. The thesis bases on the practical situation of transmission mesh of main transmission gear at the same time uses the business finity element software to detail analyze the damnification degree. Then compares with contact stress and VonMises stress in a normal state. At last correctly recognize the accretion of stress which is induced by damnification. It deduces from the results of calculation that the maximal contact stress have a obvious accretion at the hurt spot, the quantity is maybe 1.5 times than the normal state. But the bend stress almost the same. Bases on the result and maintenance means proposing a suggestion about the feasibility of maintenance. Using manual arc welding to deal with the damnification belt about 50mm long result from continuous spot which looks like a circle with 2mm deep. The spot's diameter is from 3mm to10mm. About spot face hurt using blaze welding or resistance welding. Using melting diffuse welding to deal slot disfigurement.