Inspection and analysis of cracks on 35 MN hydraulic press cylinder
LIU Xiaolei 1，SHI Feiyang 2，CHEN Changhua 1，MIN Ming 1，HU Jiahao 1
1. Technology Center，Nanjing Develop Advanced Manufacturing Co.，Ltd.，Nanjing 210048，China；
2. School of Metallurgy Engineering，Anhui University of Technology，Ma'anshan 243002，China
Abstract：During the normal operation of 35 MN hydraulic press, a large amount of oil leakage occurred at the lower part of the main cylinder. After disassembly, the causes of circumferential cracks in the cylinder block were analyzed by means of macroscopic examination, magnetic particle testing, macroscopic examination, mechanical property inspection and metallographic inspection. The results showed that the crack originated from the R angle of the outer circle of the cylinder and then extended from the outer wall to the inner wall. The surface machining knife mark and mechanical properties at the excessive arc of the cylinder were much lower than the technical requirements, which caused circumferential cracks and oil leakage.
2022, Vol. 40 
