本文選題：玻璃纖維增強(qiáng)復(fù)合材料 + 鉆削機(jī)理��； 參考：《江蘇科技大學(xué)》2015年碩士論文

【摘要】：在高精尖的武器裝備及航空航天工程領(lǐng)域中均有復(fù)合材料的身影。復(fù)合材料做為一種新材料,具有輕質(zhì)高強(qiáng),防腐性好,抗疲勞性好,耐高溫等諸多優(yōu)異特點(diǎn),正在逐步撼動(dòng)傳統(tǒng)金屬材料的應(yīng)用領(lǐng)域。但現(xiàn)在復(fù)合材料的成型技術(shù),加工技術(shù)中還存在諸多難點(diǎn),對(duì)其加工機(jī)理的研究也不夠透徹。本文對(duì)玻璃纖維增強(qiáng)復(fù)合材料的鉆削過(guò)程進(jìn)行研究與分析,為其進(jìn)一步的推廣和應(yīng)用提供技術(shù)支撐。論文主要研究?jī)?nèi)容如下:(1)對(duì)玻璃纖維增強(qiáng)復(fù)合材料的本征特性及力學(xué)特性進(jìn)行了分析。包括:玻璃纖維的特性;玻璃纖維增強(qiáng)復(fù)合材料的物理化學(xué)性質(zhì)及常用成型工藝;復(fù)合材料彈性力學(xué);復(fù)合材料層板失效準(zhǔn)則等。(2)以二元直角切削為理論基礎(chǔ),對(duì)鉆削過(guò)程進(jìn)行了研究,得到了鉆削簡(jiǎn)化模型。通過(guò)刀具的受力,對(duì)其處于鉆心位置、鉆頭主切削刃位置、鉆頭最外圍的玻璃纖維進(jìn)行受力分析,得到一系列結(jié)論:當(dāng)纖維方向角與切削方向在0????90?時(shí),切削表面較為平整,斷口大致為平滑斷口,在90????180?時(shí),切削表面比較粗糙,斷口大致為彎曲斷口,其主要受到彎曲應(yīng)力。如果垂直于加工表面的力足夠大,玻璃纖維就會(huì)受到扭轉(zhuǎn),在切削力的共同作用下,那可能會(huì)產(chǎn)生傾斜斷口。通過(guò)掃描電鏡觀察,發(fā)現(xiàn)主要斷口類(lèi)型為三種,分別是平滑斷口、彎曲斷口、傾斜斷口,斷口類(lèi)型與玻璃纖維的受力有很大關(guān)系。(3)通過(guò)有限元仿真技術(shù),對(duì)玻璃纖維增強(qiáng)復(fù)合材料的鉆削過(guò)程進(jìn)行模擬。運(yùn)用ABAQUS/Explicit模塊建立其仿真模型,通過(guò)不同工藝參數(shù)的仿真試驗(yàn),得到結(jié)論:鉆削軸向力隨主軸轉(zhuǎn)速增加而減小,隨進(jìn)給速度及鉆頭直徑增加而增加。對(duì)2000r/min,120mm/min的鉆削過(guò)程進(jìn)行具體分析,在采用Hashin損傷準(zhǔn)則的情況下,分析了玻璃纖維增強(qiáng)復(fù)合材料的損傷破壞過(guò)程。通過(guò)后處理模塊對(duì)其鉆削過(guò)程中的纖維和基體受力進(jìn)行分析,發(fā)現(xiàn)纖維角度方向和其受力方向一致,且失效過(guò)程中,樹(shù)脂基體將先于玻璃纖維,這與實(shí)際情況相同。(4)通過(guò)KISLTER測(cè)力設(shè)備,對(duì)玻璃纖維增強(qiáng)復(fù)合材料的鉆削力進(jìn)行采集與分析。研究了其在不同工藝參數(shù)下鉆削力的分布情況,得到鉆削軸向力與鉆頭直徑和進(jìn)給量成正比,與主軸轉(zhuǎn)速呈反比的關(guān)系的結(jié)論,這與仿真試驗(yàn)相同。通過(guò)鉆削實(shí)驗(yàn)研究了鉆削過(guò)程中的孔壁表面質(zhì)量。對(duì)加工過(guò)程進(jìn)行總結(jié),得到出入口常見(jiàn)缺陷為毛邊,抽絲拉毛劈裂等,內(nèi)部主要缺陷為粗糙度差,分層現(xiàn)象嚴(yán)重等。
[Abstract]:Composite materials are also found in the sophisticated weaponry and aerospace engineering fields. As a new material, composite material has many excellent characteristics, such as light and high strength, good anticorrosion, good fatigue resistance, high temperature resistance and so on, and is gradually shaking the application field of traditional metal materials. However, there are still many difficulties in the molding technology and processing technology of composite materials, and the research on its processing mechanism is not thorough enough. In this paper, the drilling process of glass fiber reinforced composites is studied and analyzed, which provides technical support for its further promotion and application. The main contents of this paper are as follows: (1) the intrinsic and mechanical properties of glass fiber reinforced composites are analyzed. Including: the characteristics of glass fiber; the physical and chemical properties of glass fiber reinforced composites and the common forming process; the elastic mechanics of composite materials; the failure criteria of composite laminates, etc. The drilling process is studied and a simplified drilling model is obtained. A series of conclusions are obtained by analyzing the force of the tool in the drilling center position, the position of the main cutting edge of the bit and the most peripheral glass fiber of the bit, and a series of conclusions are obtained: when the fiber direction angle and cutting direction are 0 ~ 90? When the cutting surface is flat, the fracture surface is approximately smooth. The cutting surface is rough and the fracture surface is bending fracture, which is mainly subjected to bending stress. If the force perpendicular to the machined surface is large enough, the glass fiber will be torsional, and under the combined action of the cutting force, the inclined fracture may occur. By SEM observation, it is found that there are three main fracture types: smooth fracture, bending fracture, inclined fracture, fracture type and fiberglass stress. The drilling process of glass fiber reinforced composites was simulated. The simulation model is established by using ABAQUS/Explicit module. Through the simulation experiment of different process parameters, it is concluded that the axial force of drilling decreases with the increase of spindle speed, and increases with the increase of feed speed and bit diameter. The drilling process of 2000R / min 120mm / min was analyzed in detail. The damage and failure process of glass fiber reinforced composites was analyzed by using Hashin damage criterion. The stress of fiber and matrix during drilling is analyzed by post-processing module. It is found that the direction of fiber angle is the same as the direction of stress, and the resin matrix will precede the glass fiber during the failure process. The drilling force of glass fiber reinforced composites is collected and analyzed by KISLTER force measuring equipment. The distribution of drilling force under different technological parameters is studied. The conclusion that the drilling axial force is directly proportional to the bit diameter and feed rate and is inversely proportional to the spindle speed is the same as the simulation test. The surface quality of hole wall during drilling is studied by drilling experiments. The common defects in the inlet and outlet are wool edge, drawing and splitting, and the main internal defects are poor roughness and serious delamination.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB33

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本文編號(hào)：1874290