核电站机柜压铆螺钉紧固力矩的研究

Research on Tightening Torque of Pressure Riveting Screws for Nuclear Power Plant Cabinets

针对核电站机柜压铆螺钉在施加紧固力矩时背面出现"凹陷"缺陷的问题,对压铆螺钉的紧固力矩进行了试验研究。根据常用强度等级螺钉的理论计算紧固力矩和压铆螺钉手册规定紧固力矩,对常用规格M3、M4、M5、M6压铆螺钉分别压铆在常用厚度为1.5mm、2.0mm、3.0mm冷轧钢板进行试验,最后结合试验数据给出针对不同厚度钢板、不同规格压铆螺钉的紧固力矩推荐值。该推荐值可有效防松,可以满足法规对核电站机柜的抗震要求,目前已在核电站相关机柜和盘台中应用。

This paper mainly describes the research on tightening torque of pressure riveting screws for nuclear power plant cabinets. According to theoretical tightening torque of ordinary screws and allowable tightening torque of pressure riveting screws, the test is carried out for pressure riveting screws of M3, M4, M5 and M6, which are riveted to 1.5 mm, 2.0 mm and 3 mm thick steel plates. The result is a table of recommended tightening torques for different pressure riveting screws riveted to different thick steel plates. The screws with recommended tightening torques can be fastened reliably, and have been validated to meet the requirements of nuclear power plants by seismic test. The recommended tightening torques have been applied in some projects of nuclear power plants.