CAJ | 학술논문

超高压汽轮机低压外缸是该型号机组最大的静子部件，低压外缸由左部、中部和右部等3个部套组成，工件具有加工精度高、制造难度大等特点。在用大型数控落地镗铣床加工垂直中分面过程中，由于工件为大型金属结构件，加之装夹方法不合理，工件变形量较大，导致销孔、螺栓通孔错位。使用普通刀具加工螺栓孔导致生产效率较低，锪孔表面质量差。通过编制合理的制造方案，设计锪孔刀具装置和合理的冷却方法，保证了低压外缸垂直中分面的加工精度。
초고압기륜궤저압외항시해형호궤조최대적정자부건，저압외항유좌부、중부화우부등3개부투조성，공건구유가공정도고、제조난도대등특점。재용대형수공락지당선상가공수직중분면과정중，유우공건위대형금속결구건，가지장협방법불합리，공건변형량교대，도치소공、라전통공착위。사용보통도구가공라전공도치생산효솔교저，홀공표면질량차。통과편제합리적제조방안，설계홀공도구장치화합리적냉각방법，보증료저압외항수직중분면적가공정도。
1 55 MW steam turbine low pressure outer cylinder with a high machining precision and difficultly manufactur-ing is the largest unit stator component,which contains the left middle and right part.With large CNC boring and milling machine processing in vertical surface process,the deformation of the workpiece is larger,leading to pin holes and bolt holes which are dislocation because that the workpiece is made of the large pieces of metal structures,and the clamping method is not reasonable.The use of common tools of machining bolt holes could be leading to low efficiency of produce,and spot fa-cing surface has poor quality.Through the reasonable manufacturing methods,the design of spot facing cutter device and reasonable cooling method ensure machining accuracy of the low pressure outer cylinder vertically middle surface.