Research On The Surface Quality Of Turbine Blade 1Cr13 By Wedm

Martensite stainless steel owns lots of good features, for example: hardness, high temperature, corrosion and so on. In view of these advantages, Martensite stainless steel and semi-martensitic stainless steel were used more and more in chemical equipment, pipeline, turbine blade and medical devices. Especially, in the field of turbine blade, it`s merit is very outstanding. Because the shape of blade is rather complex,stainless steel`s hardness is very high, the cost of traditional machining process is very big, and WEDM owons the feature, as follows:"dealt with gently, precision fine, profiling realistic", processing turbine blade with WEDM is being paid attention more and more. Blade Factory of Qing Dao Jie Neng Group uses methold of WEDM to product turbine blade. In this process, the life of blade is affected by surface quality——surface roughness, crack and so on. These factors usually make the blade crack and reduce the assembiy precision. Basing on these problems, enterprise coalition was taked Blade Factory of Qing Dao Jie Neng Group and Qing Dao University of Science and Technology. This paper analyzes the surface quality of turbine blade 1Cr13 by WEDM.Basing on making orthogonal experiment in machining 1Cr13 by WEDM, the influence of main electrical parameters on maching surface roughness, variance and saliency was analyzed. Finally,the best optimal electrical parameters combination was got. It provides some reference for roughness research of processing turbine blade with WEDM.The factor of influencing surface quality of the electrode wire is an imprtant factor of influencing surface quality of WEDM. Diameter size, takeup speed, frequency conversion feeding speed, tension, reversing times, uprightness of electrode wire and driving accuracy wire-walkingwere analyzed for the influence of electrode wire on machining surface roughness in high-speed wire cutting process. The methods of choosing and using each parameter of electrode wire was introduced.Basing on the scanning electron microscope with energy spectrum, the chemical composition of 1Cr13 was analyzed; Basing on X-ray diffraction experiments, the compounds of metamorphic layer was analyzed; Under the condition of putting the test sample in the high temperature resistance furnance, the law of metamorphic layer in accordance with tempering of 1Cr13 was found; With the help of SEM and metallurgical microscope, the morphology of metamorphic layer, solidified layer, tempering layer, and quenching layer were analyzed; The law of white layer`s thickness was generalized; the micro crack of metamorphic layer was analyzed with the help of SEM; finally, the process of the WEDMed blade material- 1Cr13 was improved and generalized.Basing on the principle and method of residnal stress determination by X-ray, the residual stress of WEDMed turbine blade material- 1Cr13 was revealed. Finally, the factor of causing cracking is not residual stress.