But to the view of developing the utilities of crack, its spreading can be used to stress blanking.When the crack technique is raised and intercross with the machining technique, a new field is cut.

• 然而从开发裂纹的功利入手,利用裂纹扩展实现应力下料,出现了裂纹技术的新概念,在与机械加工技术的交叉结合上,开拓了一个新的技术领域。