【摘要】 试验证明:二辊斜轧穿孔时中心金属在特定的应力场作用下,其组织状态发生了一系列变化,具有一个有规律的变形和裂断发生发展过程。这个过程的规律性可以用五区(阶段性)和三层(区域性)加以概括。分析了变形过程和裂断过程相互伴随、相互制约关系。论述了金属体内产生的有利于实现穿孔成型的特殊的中心加工状态(即变形的力学状态和组织状态),提出了二辊斜轧穿孔变形工艺实质和最佳穿孔工艺图示以及对中心金属的裂断应该加以利用又必须加以控制的观点,试图建立正确进行穿孔工艺调整的理论基础。更多还原

【Abstract】 It is proved by experiments that the structure at the centre metal of the tube round during piercing in Mannesmann piercer has undergone a series of changes in which the whole regular process of origination and development of deformation and fracture is expressed. This regularity of the process can be characterized by "five areas" (stage character) and"three layers"(regional character).The writers analysed the relations of mutual promotion and restraint between the processes of deformation and fracture.It is proved that there is a definite "working state" produced at the centre of the tube round in Mannesmann piercer (i. e. mechanical state and structural state) with which metal is favourable to be pierced. The writers put forward the chief technological essentials of the piercing process in Mannesmann piercer and establish optimum piercing pattern as well as a viewpoint that we must make full use of and control the fracture process at the centre metal. They must be considered as the theoretical basis of technological control in piercing.更多还原