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我矿废堆卷扬机的大齿轮，直径976mm，齿宽B=100mm，齿数Z=120，模数M=8，材质为球墨铸铁。在提升废石运行过程中有二处三齿从齿根部位断裂，并每个断齿根部有大小不同的气孔缺陷。判断分析原因，确认为因该齿轮铸造缺陷所致，故修复该齿轮时应考虑先用堆焊消除气孔，再上刨铣?
Mine mine heap hoist gear, diameter 976mm, tooth width B = 100mm, the number of teeth Z = 120, modulus M = 8, the material is ductile iron. In the process of improving the waste rock, there are two tridentate fractures from the root, and each stump has different sizes of stomatal defects. Judgment analysis of the reasons identified as due to the casting defects caused by the gear, so repair the gear should be considered to eliminate the pores with surfacing, and then planing milling?