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文章分析了俄罗斯ＨＣ２１２ДФ１ 镗铣床主轴变速机构故障产生的原因，并介绍了相应的修理和改造方案。阐述了机床变速机构设计中应注意的问题，以及提高机床变速机构运行可靠性和安全性的措施。
The article analyzes the cause of the failure of the spindle speed change mechanism of the HC212ДФ1 boring and milling machine in Russia, and introduces the corresponding repair and transformation programs. The problems that should be paid attention to in design of speed change mechanism of machine tool and the measures to improve the reliability and safety of speed change mechanism of machine tool are expounded.