Research On Improvement Of Manufacturing Technology For The Gas Turbine Liner

Large gas turbine manufacture for clean energy industry has a broad development.Combustion chamber is the core component of gas turbine.Liner is an important component in the combustion chamber,but the working life of liner is short.The potential demand is big,but it is difficult to manufacture,research and development,so project delay is a big problem.In order to get a bigger share of the market in the market competition,it is important to improve the production efficiency,and reduce the part manufacture time.Through the process route of the single and group part,it is found that the forming,turning,milling process of body liner,and welding of liner stop are the factors of affecting the part manufacturing time.In the original process,the liner body is formed by cavity and forcer die,which is low efficiency,unsafe and need long time to test.After the forming of liner body,90 heat-sinks are to be turned first,then 88 division trenches are to be milled.There is a secondary alignment when reassembling the part from turning to milling.The roundness is not same on the circle of the part,so the milling cutting quantity have to be adjusted individually when milling each division trench,thus production efficiency is extremely low.After the welding liner stop,the part needs to be milled to the final dimensions.Because of the welding distortion,the part has to be repaired repeatedly to against the exceeding of milling dimension limits.In order to improve the manufacture efficiency of part,increase the qualification rate of parts,and reduce the rework time of parts,the research on the process improvement of liner has been done as followed.(1)Because the forming manufacture efficiency of liner body is low and the spring-back cannot be controlled,the forming process has been analyzed.To improve the liner body forming process,the forming by cavity and forcer die has been changed to the forming by default cavity die,and realized the forming by negative angle default cavity die.The forming manufacture process has been simplified,the forming manufacture time has been reduced about 1 hour.(2)Because the part can not be rough turned,and the part need to be secondly assembled and input the cutter compensation 88 times by hand when milled,the manufacture efficiency is low.The turning and milling process has been analyzed,on the basis of improving the turning process and milling cutting tools,the turning and milling fixture has been improved,and applied quick-change fixture for turning and milling,which reduces manufacture time of turning and milling 13 hours in all.(3)Because of welding distortion,the liner stops are difficult to milled and need to be repaired repeatedly.The welding process and milling process have been analyzed,the process of milling the liner stop with stocks after welded has been changed to weld the liner stop without stock,and the milling operation has been removed.This improvement has greatly reduced the cases of exceeding dimension limits by welding distortion,which has to be repaired repeatedly,and manufacture time has been reduced about 6 hours.The above process improvements have greatly reduced the manufacture time of parts,which has reduced 20 hours per part,and reduced the cases of exceeding dimension limits in the process of machining parts.Those three key operations improvements are all applied to the actual manufacture of series products of liner.