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1. 齿轮裂纹情况材料ZG55Ⅱ,模数18,齿数150,直径2736mm,厚280mm,重量2040kg。齿轮内径处表面因与筒体用弹簧板相连(铆接),形状较复杂。齿圈铸造后经外观检查未发现问题,但机加工后,发现齿圈侧面冒口处有五处裂纹及砂眼等缺陷,大的砂眼直径达30mm,深度50～60mm;裂纹最宽处2mm,最深30mm,长l00mm。有两处裂纹延伸至齿根。裂纹分布、走向不规则,呈曲线形,如图1所示,缺陷较严重,又是成品补焊,既要保证焊缝及母材的结合强度,又要严格控制变形,不能再形
1. Gear crack situation Material ZG55 Ⅱ, modulus 18, the number of teeth 150, diameter 2736mm, thickness 280mm, weight 2040kg. The surface of the gear inner diameter is connected with the spring plate of the barrel (riveted), and the shape is complicated. After ring gear casting appearance inspection found no problem, but after machining, gear ring side riser found five cracks and trachoma and other defects, large trachoma diameter of 30mm, depth 50 ~ 60mm; the widest crack 2mm, The deepest 30mm, length l00mm. There are two cracks extending to the root. Crack distribution, to the irregular, curved, as shown in Figure 1, the more serious defects, but also finished welding, it is necessary to ensure the weld and the base metal bonding strength, but also strictly control the deformation, can not be re-shaped