龙门加工中心地脚螺栓组分步预紧工艺研究

摘要: 五轴龙门加工中心在现场安装过程中，地脚螺栓安装预紧力导致机床床身变形将影响加工中心的几何精度，而产生的应力分布特性将影响加工中心的精度保持性。论文在分析螺栓预紧模型的基础上，提出了基于最小变形安装误差和均匀螺栓结合面压力分布的地脚螺栓组分步预紧工艺方法，并量化分析了预紧顺序、分步加载预紧步数以及预紧力分配比例对于导轨安装面几何精度、结合面压力分布均匀性以及精度保持性的影响。仿真结果表明，该方法能够实现五轴龙门加工中心地脚螺栓组快速，有效的安装，解决了传统经验安装效率低，精度难以保证的问题。
- 龙门加工中心 /
- 地脚螺栓 /
- 分步预紧 /
- 预紧力
Abstract: In the installation process of five-axis gantry machining center, the machine bed's deformation, resulting from pre-loading force in anchor bolts installation, will affect the geometric accuracy of gantry machining center, and the stress distribution characteristics will affect the gantry machining center's accuracy maintenance. Based on the analysis of the bolt pre-loading model, the step pre-loading method of the anchor bolts is proposed, and the method is based on the minimum deformation installation error and the uniform pressure distribution of the bolts. And how these factors, including pre-loading order, pre-loading steps' number and pre-loading steps' ratio, influence the geometrical accuracy of rail mounting surface, uniformity of the pressure distribution and precision retention of the gantry machining center are analyzed quantitatively. The simulation results show that the present method can realize fast and effective installation of the anchor bolts in five-axis gantry machining center, and it can also solve the problem that the traditional experience method's installation efficiency is low and its accuracy is difficult to guarantee.
- gantry machining center /
- anchor bolts /
- pre-loading in steps /
- pre-loading force

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