关键词: 65Mn弹性挡圈, 脆断, 高温淬火, 低温回火, 保温时间

Abstract: In the motor assembly process, 65Mn elastic ring often appears brittle fracture, which increases the difficulty of installation and slows down the assembly progress. The stress condition of 65Mn elastic ring was analyzed by finite element simulation. It was considered that the brittle fracture of the ring was due to the high hardness of 65Mn elastic ring under the action of large stress, which could not adjust its own stress distribution, resulting in brittle fracture. In view of the problem, it was found that the heat treatment method of appropriately extending the holding time of low-temperature tempering could greatly improve the hardness uniformity of the spring retaining ring produced in batches, and solved the brittle fracture problem of the retaining ring in the assembly process.

Key words: 65Mn elastic ring, brittle fracture, high temperature quenching, low temperature tempering, holding time