汽轮机静叶片端面加工通用夹具设计应用

Design and Application of General Fixture for End Face Machining of Steam Turbine Static Blades

汽轮机静叶片端面加工作为关键工序,其加工精度对装配及机组性能影响较大。传统的加工方案因加工效率低,加工精度差,已不能满足实际生产需求。随着加工工艺及制造技术的快速发展,工序集中加工方案已经占据主导地位,加工效率及精度较高,同时对夹具的稳定性、可靠性、安全性及可操作性要求都比较高。汽轮机由多个级静叶片构成,随着通流变化的要求,静叶片的外形轮廓及结构均存在差异,这对夹具的设计提出了更高的要求,加工过程中每级叶片均采用专用夹具,夹具制造成本过高,对于企业来说是一种负担,不利于可持续发展,设计低成本的通用夹具是解决问题的关键。因此,应用Creo Parametric三维软件,通过不断优化与仿真演练完成了通用夹具的设计方案与制造,最终实现了快速换模,提高了加工效率。

As a key process, the machining accuracy of turbine stator blade face had great influence on assembly and unit performance. The traditional machining scheme could not meet the actual needs of production because of its low machining efficiency and poor machining accuracy. With the rapid development of machining process and manufacturing technology, the centralized machining scheme has become the dominant one with high machining efficiency and accuracy, and high requirements for the stability, reliability, safety and operability of the fixture. The steam turbine consisted of several stages of stationary blades, with the change of flow, the contour and structure of stationary blades were different. Therefore, higher requirements were put forward for fixture design. Each stage of blades was processed with special fixtures, and the manufacturing cost of fixtures was too high, which was a burden for enterprises and was not conducive to sustainable development. designing low-cost general fixtures was the key to solve the problem. By using Creo Parametric 3D software, the design and manufacture of general fixtures were completed through continuous optimization and simulation exercises, and the rapid replacement was finally realized, which improved processing efficiency.