(燕山大學 機械工程學院， 秦皇島 066004)
摘 要: 機械擴徑是制造各種管筒形零件的有效方法之一。 研究機械擴徑技術(shù)，首先需要建立管坯在擴徑過程中可以擴圓的整體屈服條件和可能擴裂的局部破壞條件。根據(jù)管坯的基本變形規(guī)律和主要特征，提出了在機械擴徑過程中，管坯變形可以分為整圓和擴徑兩個階段的概念。 通過對這兩個變形階段的應(yīng)力分析，建立了管筒形零件機械擴徑時的整體屈服和局部破壞條件，即機械擴徑成形條件。
關(guān)鍵字: 機械擴徑；應(yīng)力分析；成形條件；管筒形件
LI Qun, REN Yun-lai
（College of Mechanical Engineering,
Yanshan University, Qinhuangdao 066004, China）
Abstract:Expanding is one of the effective methods for producing cylindrical parts. It is a key subject in the basal research on expanding technology to set up a reasonable technical standard and the predetermined deformation level, according to the specific shape of the raw pipes. It is therefore necessary to give the overall yielding criterion for expanding and the local rupture criterion for possible cracking. Based on the basic deformation law and main features of pipe, a conception that the deformation process can be divided into two stages was established. After the stress analysis of the part at the stages, the overall yielding criterion for expanding and the local rupture criterion for possible cracking were established.
Key words: mechanical expanding; stress analysis; forming criterion; cylindric products
