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在锻模的各种破坏形式中,因凹圆角处应力集中而引起的破裂占很大的比例。为了提高模具寿命,有必要冲破圆角半径取值的一般参考公式r=余量+α(α表示倒角值或圆角半径值)的束缚,在保证适当加工余量的前提下扩大圆角、减小应力集中。事实上,技术人员在设计模具时,所取圆角半径也往往比上述参考值大。这里就模具凹圆角半径的最大取值提出以下讨论。
In the various forms of forging damage, due to stress concentration concave round corner caused by the collapse of a large proportion. In order to improve the life of the die, it is necessary to break the bond of the fillet radius radius r = the margin + α (α represents the chamfer value or fillet radius value), expand the fillet under the premise of ensuring the proper machining allowance , Reduce stress concentration. In fact, technicians in the design of the mold, the fillet radius is often also larger than the above reference value. The following discussion is made on the maximum value of the die-fillet radius.