【摘要】：運用“單元生死”技術(shù)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(zhǔn)地進行單元選擇、物理仿真與幾何仿真的結(jié)合性差等。本文通過對基于Abaqus“單元生死”技術(shù)的銑削仿真前處理關(guān)鍵技術(shù)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(zhǔn)地設(shè)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(jié)合,大大提高了該仿真方法的準(zhǔn)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(jié)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(jié)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(shè)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(yīng)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(guān)鍵技術(shù)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(jié)果與實際加工變形結(jié)果,從而驗證前處理關(guān)鍵技術(shù)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(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG547

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