锤杆断裂原因及修复

• 作 者: 陈学明 刘新莲 朱元芳
• 机 构: 新疆第三机床厂,新疆第三机床厂,新疆第三机床厂
• 出 处: 中国设备管理
• 发表日期: 1997年02期
• 关键词: 断裂原因 锻造比 超声波探伤 焊缝表面 锻打 超负荷运转 加工余量 划伤 焊透 焊接应力

我厂的一台C41-1000型空气锤,在一次锻打皮带轮时发现锤杆表面有划伤和研伤.经检查,锤杆表面在中下部390mm处有120mm长的裂纹,刚好在锤杆中下部内孔φ330mm阶梯边缘处.用超声波探伤知,裂纹中部深度达25mm,两端深度为8～9mm,沿120mm裂纹两端继续探伤均有裂纹.锤杆断裂部位见图1.产生裂纹的主要原因如下.1.锻造工件的锻造比过大,设备超负荷运转.2.锻打时低于锻造温度,并有偏击现象.

A C41-1000 air hammer in our factory found scratches and wounds on the surface of the hammer rod during the forging of the pulley wheel, and after checking, there was a 120 mm long crack in the middle and lower 390 mm of the hammer rod surface, Middle and lower inner hole φ330mm step edge.With the ultrasonic flaw detection, the central crack depth of 25mm, both ends of the depth of 8 ~ 9mm, crack along both ends of the crack along the 120mm have cracks. Hammer bar fracture site shown in Figure 1. Cracking The main reason is as follows.1.Forging workpiece forging ratio is too large, the device is overloaded operation .2 forging lower than the forging temperature, and there is partial strike phenomenon.