| The integral disc-shaft is an important rotating part of a new aeroengine.Through design improvement,the bolt connection of the original two parts is cancelled,and the original disc and the front axle neck are integrated into a typical complex part.which can reduce the weight of the engine significantly,improve the structural of the compressor rotor rigidity,and reduce the number of parts,and enhance the reliability and thrust-weight ratio of the engine.Because of the change of structure,the machining difficulty of the part is increased.The material of the part is titanium alloy TC17.The structure of the part is complex and the dimension precision is high.The processing method in the original processing technology of this part in the trial-manufacture stage of scientific research is backward and the process design is unreasonable.The general machining processing is separated from turning,drilling and milling.The processing route is longer and the working procedure reaches 46.Because of the poor performance of processing equipment,tooling and cutting tools,the cutting speed can only reach 50m/min,the processing efficiency is low and the processing time of a single part reaches 80 hours.While the qualified rate of parts is only 50%.In this paper,aiming at the structural characteristics of the part and the existing processing technology,in order to ensure high quality and improve processing efficiency,new processing technology research is needed.In order to improve the quality and efficiency of parts processing,the special equipment of Turning-Milling compound machining center is selected,and the research of high-efficiency Turning-Milling technology is carried out.The turning,drilling and milling are processed in one clamp of parts by applying advanced Turning-Milling compound processing technology at home and abroad,which reduces the number of working procedures.Compared with the original processing technology,the processing accuracy and efficiency are improved.In order to ensure the processing accuracy and new Turning-Milling process,a new fixture and clamping scheme is designed to reduce the deformation of the parts in the original process,and a processing test is carried out for the new structure cutters to eliminate the vibration in the process of processing.In order to improve the processing efficiency,the high-pressure cooling tool and swing turning technology were applied,and the online measurement technology was used to raise the linear speed of parts finishing to more than 80 m/min,and improve the eligibility rate of parts to 100%,and shorten the processing time of single parts to less than 35 hours.Due to the improvement of design structure,the structure of tungsten carbide coating is added to the Journal of parts.Because tungsten carbide coating belongs to super-hard coating,the surface quality after processing is required to be within Ra0.80.The processing technology for this difficult-to-process material has not been successfully developed,and the processing cycle and time are also prolonged,which seriously restricts the delivery and matching of the factory.Therefore,in order to break through the processing difficulties and reduce the processing cycle in terms of efficiency,it is necessary to study the grinding process of tungsten carbide coating,select reasonable grinding wheel and determine reasonable processing parameters to ensure that the dimensional accuracy and surface roughness of the coating after processing meet the requirements.Through the research of this paper,the whole disc shaft parts have realized the batch production of Turning-Milling compound processing,the processing efficiency has been increased three times,the surface roughness of tungsten carbide coating has met the design requirements,and the qualified rate of parts has reached 100%.The research of new Turning-Milling composite processing technology and coating processing technology is of great significance for improving the manufacturing technology of titanium alloy integral disc shaft parts. |
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