| With the development trend of manufacturing technology automation,the forming quality of turbine blade blanks directly affects the quality of turbine blades and the energy conversion efficiency.Domestic blade blank forming technology mainly relies on artificial free forging and extrusion heading forming,forming quality has a large randomness,production and processing efficiency can not meet the current business needs,while the blade blank design process requires a lot of manpower and time,Increased the blade production cycle and manufacturing costs,so the need for more advanced design techniques and manufacturing process to the use of blanks in the production process.In this paper,this paper focuses on the advanced blade forging process,and develops an auxiliary process system suitable for the forging forming of the blanks.The forming quality and production efficiency of the blanks are improved to realize the process of the blade blank from design to forging of the standardization,automation and systematic,based on this article mainly carried out the following research work:(1)Taking the 0Cr17Ni4Cu4 Nb stainless steel as the research material,the thermal deformation and rheological behavior of the strain at 900 ~ 1200 ? and the strain rate in the range of 0.001s-1 ~ 10s-1 were studied.Based on Prasad plasticity instability(0Cr17Ni4Cu4Nb stainless steel)under hot deformation conditions,and the thermal deformation mechanism of 0Cr17Ni4Cu4 Nb stainless steel was analyzed.Based on the analysis of the thermal processing chart,the thermal deformation energy dissipation diagram and thermal processing of 0Cr17Ni4Cu4 Nb stainless steel were plotted and the dynamic material model(DMM)The range of the parameters of instability and the range of the best thermal deformation parameters are obtained,which provide the theoretical basis for the formulation and optimization of 0Cr17Ni4Cu4 Nb stainless steel hot working process.(2)Based on the best thermal deformation parameters analyzed by the hot drawing,the simulation model of the four-hammer radial forging of the steam turbine blade was established by means of Simufact.Forming forging analysis software.The parameters of the process parameters,hammer type and structural parameters In this paper,the simulation results are analyzed by means of mathematical evaluation.By comparing and analyzing the simulation results under different forging conditions,different forging conditions are obtained.The results show that the forging conditions,the dimensional precision,the internal grain size distribution and the appearance defects are the same.Under the best forging process parameters,hammer type and structural parameters,to the designer in the hammer structure parameter design and selection and process parameters to provide a reference.(3)Based on the summary of the design technology of the blade blanks and the practical experience,the framework of the automatic design system of the blade blanks was constructed.The reverse design process of the blanks from the finished product to the blank design and the original blank was established by mathematical model.At the same time,the forging hammer is classified according to the design criteria and structural characteristics of the forging hammer,and its design process is parameterized.In addition,according to the movement characteristics of the forging process of radial forging,taking the typical cylindrical stepped blank as an example,the process of forging process is explored and analyzed.(4)Based on the C # and UG/NXOpen secondary development technology,a parameter extraction system based on parameter driven blade rough forging was developed based on the design of the blade blank and the forging hammer design and the forging forming process control mathematical model.To achieve the parameters of the blade blank and forging hammer design process automation,shorten the blade blank design cycle,improve the rough production efficiency.At the same time,according to rough forging step diagram generated process control parameter table,to forging the host computer control software programming provides a convenient. |
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