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热锻模燕尾根部裂纹,是造成热锻模早期失效的主要原因之一。目前,防止燕尾根部剩纹的方法主要有:①降低燕尾硬度,使燕尾的硬度低于型腔的硬度。②淬火后将燕尾平面加工平,保证锻锤砧面与燕尾接触良好。③适当增加燕尾根部的圆角半径。以上几点是防止热锻模燕尾裂纹常用的有效方法。但燕尾根部的加工缺陷,常常是产生裂纹的根源。消除燕尾根部的加工缺陷,也是防止燕尾裂纹的有效方法,这一点往往被人们所忽略。
Hot forging die dovetail root crack, hot forging die is caused by one of the main causes of failure. At present, the method to prevent the dovetail root remnants are: ① reduce the dovetail hardness, the dovetail hardness is lower than the cavity hardness. ② after quenching flat swallowtail flat processing, to ensure that forging hammer anvil and dove contact well. ③ appropriate to increase the fillet radius of the dovetail root. The above points is to prevent hot forging dovetail crack commonly used effective method. But the processing defects of the dovetail root are often the root cause of cracks. To eliminate the processing defects of dovetail roots, but also to prevent dovetail crack effective method, which is often overlooked by people.