某发动机盘轴“扭矩–转角”连接法应用试验

Application Experiment of “Torque–Angle” Method for Engine Disk and Shaft Connection

螺栓连接是航空发动机机械连接的主要方式,传统的扭矩法造成预紧力误差较大,尚不能满足发动机高精确性、高可靠性连接的工艺控制需求。为此,以某型发动机低压涡轮盘轴的关键连接结构为对象,将传统的扭矩法和先进的转角法相结合,在国内发动机装配中首次应用"扭矩控制–转角监测"法,并设计开发智能拧紧系统,利用转角法预紧力精度高的特点,在准确施加扭矩的同时,监测调整螺母的转动角度,保证了预紧力的准确控制和连接刚度的均匀一致,提高了发动机的结构连接质量,为后续工艺协同发动机设计提供了技术手段,对发动机装配表现的不一致性问题提供了解决途径。

The bolt connection is the main way of mechanical connections for aero-engine. The traditional torque method causes a large pre-tightening error, which reduces the connection quality to some extent. Therefore, the key connection structure of an engine low-pressure turbine disk and shaft is taken as subject, which is combined with the traditional torque method and the advanced angle method. For the first time, in the domestic engine assembly, the “torque control + angle monitoring” method is applied, and the intelligent tightening system is developed. Taking use of high precision of the pre-tightening force by angle method, when the torque is accurately applied, the rotation angle of nut is monitored to adjust to ensuring the precise control and the uniformity of the joint rigidity, and the structural connection quality of the engine is improved, which is going to provide technical means for subsequent process co-design of engine and solutions to engine assembly inconsistencies.