【摘要】：運用“單元生死”技術可以有效地解決物理仿真難以模擬工件實際加工過程的問題,但目前這種人力選擇“單元生死”的方法還存在一些問題,如工作量巨大甚至難以勝任、無法精準地進行單元選擇、物理仿真與幾何仿真的結合性差等。本文通過對基于Abaqus“單元生死”技術的銑削仿真前處理關鍵技術的研究,如數(shù)控刀軌的離散化、刀具掃描體建模、網(wǎng)格單元干涉切除以及銑削力的加載等,實現(xiàn)了根據(jù)不同刀具形狀和刀軌路徑自動地、精準地設置“單元生死”和加載銑削力,將幾何仿真與物理仿真有效地結合,大大提高了該仿真方法的準確性和實用性。本文完成的主要研究工作如下:(1)通過Python語言編程,讀取UG數(shù)控銑削刀軌并進行離散化處理,結合六參數(shù)立銑刀模型,運用基于高斯映射的刀具掃描體建模原理,建立刀具掃描體微元集,有效地解決了物理仿真與幾何仿真結合性差的問題。(2)運用奇偶判別法原理,計算得到刀具掃描體“切除”的工件網(wǎng)格集,并設置“生死單元”;根據(jù)刀軌路徑,計算銑削力在X、Y、Z三個方向上的分力,并將其加載到對應網(wǎng)格的節(jié)點上,從而模擬銑削過程中銑削力對工件的作用。(3)基于上述前處理關鍵技術的研究,針對三軸銑削加工仿真,開發(fā)Abaqus前處理插件,使該插件適用于各種工件、刀具和銑削刀軌的三軸銑削仿真中。(4)運用插件對具有代表性的薄壁件銑削加工仿真進行前處理,并進行Abaqus仿真、薄壁件實際加工和測量,通過比較仿真變形結果與實際加工變形結果,從而驗證前處理關鍵技術和前處理插件的正確性。
[Abstract]:The application of "unit life and death" technology can effectively solve the problem that physical simulation is difficult to simulate the actual processing process of workpiece. However, there are still some problems in this method of manpower choosing "unit life and death", such as heavy workload or even incompetence. The unit selection can not be carried out accurately, and the combination of physical simulation and geometric simulation is poor. In this paper, the key technologies of milling simulation pre-processing based on Abaqus "Unit birth and death" technology are studied, such as the discretization of NC cutter tracks, tool scanning volume modeling, mesh element interference removal and milling force loading, etc. According to different tool shape and path of tool path, automatic setting of "unit life and death" and loading milling force is realized. The geometric simulation and physical simulation are effectively combined, which greatly improves the accuracy and practicability of the simulation method. The main work of this paper is as follows: (1) through Python language programming, read UG NC milling tool track and discrete processing, combined with six-parameter end milling cutter model, using the principle of tool scanning volume modeling based on Gao Si mapping. The problem of poor combination of physical simulation and geometric simulation is effectively solved by establishing tool scanning volume micro-element set. (2) the workpiece grid set of tool scanning volume "excision" is calculated by using the principle of odd-even discriminant method, and the "life and death unit" is set up. According to the path of the cutter path, the milling force is calculated in three directions, and loaded on the node of the corresponding mesh. In order to simulate the effect of milling force on workpiece in milling process. (3) based on the research of the key technology of pre-processing, the Abaqus pre-processing plug-in is developed for three-axis milling simulation, which makes it suitable for all kinds of workpieces. In the three-axis milling simulation of cutting tools and milling tool tracks. (4) preprocessing the typical thin-walled milling simulation by using plug-in, and carry out Abaqus simulation, practical machining and measurement of thin-walled parts, By comparing the simulation results with the actual deformation results, the correctness of the pre-processing key technology and pre-processing plug-in is verified.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG547

【參考文獻】

相關期刊論文 前10條

1 黎柏春;楊建宇;于天彪;王宛山;;在GPU上實現(xiàn)基于高斯映射的通用刀具掃描體建模[J];計算機輔助設計與圖形學學報;2015年07期

2 汪振華;袁軍堂;劉婷婷;夏亮亮;;生死單元法分析薄壁件加工變形[J];哈爾濱理工大學學報;2012年06期

3 劉一華;賀峗暉;詹春曉;李昊;;盲孔法中釋放系數(shù)的數(shù)值計算方法[J];機械強度;2008年01期

4 劉強,尹力;一種面向數(shù)控工藝參數(shù)優(yōu)化的銑削過程動力學仿真系統(tǒng)研究[J];中國機械工程;2005年13期

5 趙曉明,胡德金,趙國偉;5坐標數(shù)控加工中工件表面形貌的計算機仿真[J];上海交通大學學報;2003年05期

6 王霄,劉會霞,楊潤黨,蔡蘭;虛擬數(shù)控加工過程物理仿真模型的建立[J];計算機仿真;2003年04期

7 候海量,朱錫,劉潤泉;盲孔法測量921A鋼焊接殘余應力的應變釋放系數(shù)研究[J];船舶工程;2003年01期

8 黃雪梅,趙明揚,王啟義;虛擬數(shù)控車削物理仿真系統(tǒng)的研究與開發(fā)[J];中國機械工程;2002年15期

9 王洪祥,孫濤,董申,李旦;超精密車削表面微觀形貌的幾何建模與仿真研究[J];中國機械工程;2002年13期

10 葛研軍,盧碧紅,王啟義;車削加工物理仿真實現(xiàn)技術[J];機械科學與技術;2001年03期

相關博士學位論文 前2條

1 李清;虛擬數(shù)控銑床加工過程仿真系統(tǒng)及相關技術的研究[D];天津大學;2004年

2 黃志剛;航空整體結構件銑削加工變形的有限元模擬理論及方法研究[D];浙江大學;2003年

相關碩士學位論文 前3條

1 付嘉寶;2124鋁合金薄壁結構件加工變形控制技術研究[D];南京航空航天大學;2015年

2 李華;盲孔法測量非均勻殘余應力時釋放系數(shù)的研究[D];合肥工業(yè)大學;2012年

3 賀峗暉;盲孔法中彈性階段釋放系數(shù)的數(shù)值計算方法研究[D];合肥工業(yè)大學;2006年

，

本文編號：2308138