This paper describes the pretightness definition after the elastic part is added to the flange bolts so as to increase the anti-fatigue strength and derives the relevant calculation formula.

• 阐述了球磨机筒体、法兰联接螺栓为了提高其疲劳强度而增加弹性元性之后，其预紧力的确定力法，并导出了相应的计算公式。