Reverse Design And Accuracy Verification Analysis Of Agricultural Centrifugal Pump Impeller

As the core part of centrifugal pump,impeller has a complex curved surface,which is difficult to model in the forward direction and takes a long time.For the impeller with high accuracy requirements,due to the limitations of design method,processing technology and testing instruments,the quality of impeller cannot be guaranteed.The quality of impeller is directly related to the performance of centrifugal pump.For the manufacturers of centrifugal pump,the key to solve the problem is to improve the performance of centrifugal pump with low cost,high efficiency and high precision.Using reverse design centrifugal pump impeller,3D printing fast proofing verification design,is the solution for enterprises.At present,the research of reverse design only focuses on data collection and reverse drawing.However,the generalized reverse design includes data collection,reverse drawing,rapid proofing and process planning.The research on the factors that affect the accuracy of the impeller in the reverse process is relatively less,the reverse design steps of the impeller are various,and the accumulated error can not be ignored.The systematic research error source is the premise to ensure the high accuracy of the reverse impeller.Therefore,this paper studies the factors that affect the precision of impeller reverse design from three aspects: data collection,reverse design and rapid proofing,so as to provide basis for improving the precision of agricultural machinery reverse design.Firstly,the paper uses the prince 775 hand-held red and blue two-color three-dimensional scanner to accurately and completely obtain the data of impeller.By using the Geomagic Studio software to simplify and reduce the noise of data,the data suitable for reverse mapping is obtained.Using the Geomagic design x software to complete the reverse drawing of impeller and realize the parameterization of point cloud.The rapid proofing of impeller is completed by using the technology of light curing and hot melting.At the same time,the causes of errors in each stage are analyzed.Finally,we use Geomatic control x to evaluate the three-dimensional and two-dimensional accuracy of the impeller with the best fitting alignment,and obtain the test results of each stage of the impeller.Based on the test results,we verify whether the reverse design of the impeller meets the design requirements.The factors that affect the accuracy of impeller come from acquisition instrument,reverse personnel,reverse software,rapid prototyping equipment,molding materials and other links.The core of this paper is to analyze the causes of errors in each stage,and to carry out the research on the precision of reverse design of impeller,which is verified by experiments.The paper completed the selection of impeller data reverse tools,optimized the collection process,and summarized the collection precautions.In the process of reverse design,the factors that affect the accuracy of impeller are discussed.The comparison error judgment of impellers in each stage is completed,the causes of error caused by positioning are determined,and the methods of avoiding and improving are proposed.Finally,the fast design,fast proofing and fast detection of impellers are realized.This paper puts forward a method to reduce the cumulative error of reverse design and 3D printing,which can provide valuable results for improving the reverse design of agricultural machinery.