Research On Precision Machining Technology For Complex Curved Surface Of Slender Screw Rotor

With the development of industry and economy,the manufacturing industry in developing countries is developing rapidly,and various types of spiral curved products are increasingly in the fields of rotating aerospace,shipbuilding,energy,transportation,and so on.The screw rotor is a crucial part of the screw pump and other equipment,and its manufacturing accuracy dramatically affects the quality of the whole machine.In the previous screw-rotor finishing process,finishing milling,manual grinding,and cloth wheel grinding are usually used.This paper studies the precision grinding of slender screw rotors,designs a set of grinding devices suitable for slender screw rotors,and uses a five-head screw as the processing object to grind the processing track,contact pressure,removal model The processing parameters and other issues were theoretically analyzed and experimentally verified.The specific results are as follows:(1)Consult a large number of related documents to grasp the development status of abrasive belt grinding technology for complex curved surfaces;put forward a parallel grinding processing scheme based on the characteristics of spiral curved surfaces,and design abrasive belt grinding processing devices on this basis;The coordinate system of the tool and the workpiece,and planning the grinding path of the five-head screw belt grinding;a simulation software was used for motion simulation,the correctness of the theoretical calculation is verified,which provides a theoretical basis for subsequent analysis.(2)Through the analysis of the contact problems involved in the processing of the grinding device,the semi-analytical method,and the geometric approximation method are used to study the contact wheel contact problem and the free-type belt contact problem and contact area.The above calculation method is simulated by finite element simulation software,which verifies the accuracy of the theoretical calculation of the contact problem.(3)Based on the ThunderGBM algorithm and single-factor test data,a prediction model for the abrasive belt removal rate was established,at the same time,the influence of different parameters on the removal rate was studied,and the grinding process was also studied.The results were predicted.(4)Aiming at the problem of the installation swing angle of the grinding device in processing,an optimization model of swing angle selection based on the estimated deformation is proposed,and the theoretical optimal swing angle is obtained;The situation was run,and analyzed separately from the two aspects of grinding area size and grinding removal uniformity,which verified the applicability of the swing angle optimization algorithm.Finally,through the actual grinding process,the practicability and correctness of the theoretical results of this paper are verified.The multi-head screw belt grinding theory research carried out in this project can not only promote the improvement of the belt grinding theory,but also have very important significance for achieving high-precision and efficient grinding of the screw.Screw parts are widely used and involve many fields.The processing accuracy of the screw is exceptionally high.How to achieve high-precision screw surface grinding has important engineering application significance.