本文選題：無芯模旋壓　切入點：軌跡規(guī)劃　出處：《浙江大學》2017年碩士論文

【摘要】：在金屬塑性成形領域,旋壓作為一項特殊的加工工藝,因其具有無屑加工、產品精度高、功耗低等優(yōu)點而越來越多的受到關注。本文針對無芯模旋壓中加工量的表征方式存在的不足,首先對本課題組提出的彎曲量和環(huán)向應變量兩種加工量在旋輪軌跡規(guī)劃和變進給比方面進行對比,分析兩者各自的優(yōu)缺點,然后根據(jù)兩種加工量推導出綜合加工量,最后基于綜合加工量進行軌跡規(guī)劃和變進給比研究,并驗證了基于綜合加工量的軌跡規(guī)劃和變進給比方法的有效性。本文分為六章,主要內容如下:第一章介紹了旋壓的加工方法,并闡述了無芯模旋壓的研究背景和意義,列出了無芯模旋壓技術的國內外研究現(xiàn)狀,給出了本文的主要研究內容和組織框架。第二章列舉出了本課題組提出的兩種加工量表征方式——環(huán)向應變量和彎曲量,介紹了本文所用的實驗結合仿真的研究方法,給出了實驗的平臺和相關工藝參數(shù),總結了旋壓仿真中所用的有限元顯式動力學理論并給出了仿真軟件中相關參數(shù)的選取。第三章對基于兩種不同加工量的軌跡規(guī)劃與成形質量關系進行對比研究。控制理想形狀曲線和工藝參數(shù)一致,分別設計各道次等彎曲量和等環(huán)向應變量的軌跡規(guī)劃實驗,得出等彎曲量的軌跡規(guī)劃方式較等環(huán)向應變量的規(guī)劃方式形狀精度更高而壁厚減薄更嚴重的結論;在兩種加工量的表征下,通過提高終道次的加工量占比進行軌跡規(guī)劃優(yōu)化,基于環(huán)向應變量的優(yōu)化方法較彎曲量的優(yōu)化方法對形狀精度的提高幅度更大。第四章對基于兩種不同加工量的旋輪變進給比與成形質量關系進行對比研究�？刂评硐胄螤詈图庸た倳r間相同,分別設計各道次等平均彎曲量變化速度和等平均環(huán)向應變量變化速度的道次間變進給比實驗與終道次等彎曲速度和等環(huán)向應變進給比的道次內變進給比實驗,得出基于彎曲量的道次間和道次內變進給比較基于環(huán)向應變量的變進給比方法得到的形狀精度更高而壁厚減薄更嚴重的結論;在兩種加工量的表征下,通過提高終道次的加工時間占比進行道次間變進給比優(yōu)化以及提高道次內變進給比的道次數(shù)進行道次內變進給比優(yōu)化,結果顯示基于彎曲量的道次間和道次內變進給比優(yōu)化方法較基于環(huán)向應變量的變進給比優(yōu)化方法得到的形狀精度更高而壁厚減薄更大。第五章提出了基于綜合加工量的軌跡規(guī)劃和變進給比方法。根據(jù)彎曲量和環(huán)向應變量推導出綜合加工量的公式,基于等綜合加工量進行旋輪軌跡規(guī)劃,并通過終道次綜合加工量占比的提高進行軌跡規(guī)劃優(yōu)化,結果顯示基于綜合加工量的軌跡規(guī)劃和優(yōu)化方法得到的形狀精度高于基于彎曲量的方法且抑制了壁厚的減薄;基于等綜合加工量變化速度進行道次間和道次內變進給比以及通過終道次加工時間占比提高進行道次間變進給比優(yōu)化和道次內變進給的道次數(shù)提高進行道次內變進給比優(yōu)化,得出基于綜合加工量的變進給比方法在有效抑制壁厚減薄的前提下能大幅提高形狀精度的結論。第六章總結了本文的主要研究成果,并指出了研究中存在的不足,對下一步的研究進行展望。
[Abstract]:In the field of metal forming, spinning as a special process, because of its non chip processing, high precision, low power consumption and more and more attention. Deficiency of the characterization method for machining mandreless spinning in quantity, first proposed on this topic group and bending ring to be two kinds of processing capacity in variable roller trajectory planning and variable feed ratio were compared, analysis the advantages and disadvantages of the two, and then derive the comprehensive processing capacity of two according to the amount of processing, and finally the trajectory planning and variable feed ratio of comprehensive processing capacity based, and verifies the validity of the trajectory planning and change feed volume ratio method based on comprehensive processing. This paper is divided into six chapters, the main contents are as follows: the first chapter introduces the processing method of spinning, and expounds the mandreless spinning research background and significance, lists the mandreless spinning technology The research status at home and abroad, this paper gives the main research content and framework. The second chapter lists the research group presented two kinds of representation - processing capacity of circumferential strain and bending, introduces the experimental research method combined with simulation, gives the experimental platform and the related technical parameters and summarizes the finite element simulation by spinning in explicit dynamics theory and gives the selection of related parameters in simulation software. The third chapter is the comparative study of the trajectory planning of two different processing capacity based on forming quality control. To shape curve and process parameters, designed for each passes and bending ring to be experimental trajectory planning variables, the way of trajectory planning is bending ring to be planning the shape precision and variable wall thickness is more serious in conclusion; two Characterization of processing amount, by improving the final pass processing accounted for the trajectory planning optimization based on loop optimization method of bending should be variable optimization method of the amount of shape accuracy greatly. The fourth chapter comparative study on two kinds of different processing capacity based on variable feed ratio and forming roller at the same time to control the total quality of the relationship between the shape and design of the ideal processing, respectively passes the average speed and average change of bending ring to strain the change speed of a variable feed ratio experiment and the end times, the bending speed and circumferential strain feed ratio passes variable feed ratio experiment that passes the amount of time between bending and internal variable feed comparison based on ring shape to the precision of variable feed variable ratio method is more effective and more severe wall thinning based on the conclusion; in the characterization of two kinds of processing amount, by improving the final pass The processing time of a variable proportion of feed increased optimization and variable feed ratio passes the number of road passes variable feed ratio optimization, results based on the amount of secondary bending between the road and pass in variable feed ratio optimization method based on ring shape precision strain variable feed ratio optimization method to get the higher wall thickness is larger. The fifth chapter puts forward the trajectory planning and comprehensive processing capacity based on variable feed ratio method. To strain derived comprehensive processing formula according to the quantity and amount of bending ring, based on the comprehensive processing capacity of cycloid trajectory planning, and the final pass through comprehensive processing the amount of the increase of the trajectory planning and optimization results show that the precision of shape, trajectory planning and optimization method based on the comprehensive processing capacity is higher than the method based on the amount of warping and restrain wall thickness; based on the changes of processing speed The degree of pass and pass in the final pass through the feed ratio and increase the proportion of processing time interval time varying feed ratio and improve optimization passes the channel number of variable feed passes variable feed ratio optimization, the comprehensive processing capacity based on variable feed ratio method to restrain the wall the thinning of the premise can greatly improve the shape accuracy of the conclusion. The sixth chapter summarizes the main research results, and points out the shortcomings of the study, the next research is prospected.

【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG306

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