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  本文關(guān)鍵詞：圓鋸片的輥壓適張機理及其工藝研究　出處：《北京科技大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 圓鋸片 輥壓適張 應(yīng)力 有限元法

【摘要】：圓鋸片是工業(yè)行業(yè)中的一種廣泛使用的加工工具,它被應(yīng)用于加工木材、石材、鋼材及混凝土等等多個領(lǐng)域。圓鋸片是一種比較典型的薄片刀具,它的最主要的結(jié)構(gòu)和工作特征是:厚度一般比直徑小得多并且需要承受高速切削的極端工作條件。這些因素會嚴重影響到鋸片的穩(wěn)定性,導(dǎo)致鋸片在加工過程當(dāng)中發(fā)生強烈振動,影響鋸片工作的加工精度和使用壽命。為了提高鋸片的切削穩(wěn)定性,可以通過應(yīng)用適張原理的一些典型方法對鋸片進行處理,比如錘擊法、輥壓法、噴丸法、加熱法及脹孔法等,在這些處理方法當(dāng)中,輥壓法具有高效率、操作簡單等一系列優(yōu)點。本論文集中于研究輥壓適張原理及其工藝,采用有限元方法建立了輥壓模型,通過有限元數(shù)值模擬對輥壓壓力、輥壓位置、壓輥半徑等工藝參數(shù)對其殘余應(yīng)力分布和剛度的影響進行了研究;通過理論計算、數(shù)值模擬及現(xiàn)場實驗綜合運用的手段對不同工藝參數(shù)下鋸片的應(yīng)力分布及其剛度特性進行了研究。本論文為圓鋸片的輥壓制造提供了相關(guān)理論依據(jù)及高效的加工處理方法,有助于提高圓鋸片的剛度、穩(wěn)定性和促進鋸片生產(chǎn)的工藝水平。本文主要創(chuàng)新性成果體現(xiàn)在以下幾個方面:(1)從理論上和仿真上解釋了鋸片應(yīng)力工程測試方法的機理。利用有限元分析獲得了檢測參數(shù)及鋸片內(nèi)應(yīng)力狀態(tài)對檢測特征曲線的影響。(2)采用理論公式計算了圓鋸片周向應(yīng)力和徑向應(yīng)力隨不同輥壓位置、輥壓壓力、壓輥半徑的變化規(guī)律。不同輥壓位置:輥壓位置越靠近內(nèi)孔,輥壓區(qū)內(nèi)的周向壓應(yīng)力就越大,外沿部分的周向拉應(yīng)力越小;輥壓位置越靠近內(nèi)孔處輥壓,輥壓區(qū)內(nèi)部的徑向壓應(yīng)力就越大,外沿部分的徑向壓應(yīng)力越小。不同半徑壓輥輥壓:相同輥壓壓力下,壓輥半徑越小,鋸片的殘余應(yīng)力就越大,即用較小輥壓半徑的壓輥輥壓鋸片可以獲得更大的殘余應(yīng)力分布。(3)建立了圓鋸片的輥壓適張仿真模擬模型,并對鋸片在輥壓后的殘余應(yīng)力分布情況及其檢測特征曲線進行了分析。分析結(jié)果表明輥壓適張過程導(dǎo)致鋸片的橫向剛度減少,即輥壓壓力越大鋸片的橫向剛度越小,且輥壓壓力越大鋸片的橫向剛度變化范圍越大(31172～18660)N/m;在相同輥壓壓力下,壓輥的半徑越大輥壓后鋸片的剛度就越大,在壓輥半徑為62mm時達到14955.8N/m。(4)通過現(xiàn)場輥壓實驗研究了鋸片輥壓時應(yīng)力圓變化的規(guī)律,分別考慮了輥壓壓力、輥壓道次、輥壓位置以及局部輥壓過程的影響因素,總結(jié)了輥壓道次和局部輥壓對應(yīng)力圓的影響特征。
[Abstract]:Circular saw blade is a widely used processing tool in industrial industry. It is used in many fields such as wood, stone, steel and concrete. Circular saw blade is a typical thin blade tool. Its main structure and working characteristics are that the thickness is generally much smaller than the diameter and it needs to bear the extreme working conditions of high speed cutting. These factors will seriously affect the stability of the saw blade. In order to improve the cutting stability of the saw blade, the cutting accuracy and service life of the saw blade are affected by the strong vibration of the saw blade during the machining process. The saw blade can be treated by some typical methods of tensioning principle, such as hammering, roll pressing, shot peening, heating and expanding hole, etc. Among these methods, roll pressing has high efficiency. A series of advantages such as simple operation and so on. In this paper, the principle and process of roll compression are studied, and the roll compression model is established by using finite element method. The roll pressure and position are simulated by finite element method. The influence of process parameters such as roll radius on residual stress distribution and stiffness was studied. Through theoretical calculations. The stress distribution and stiffness characteristics of saw blade under different technological parameters are studied by means of numerical simulation and field experiment. This paper provides relevant theoretical basis and efficient processing for roller pressing manufacture of circular saw blade. Handling methods. It helps to improve the rigidity of circular saw blade. Stability and the technological level of promoting the production of saw Blade. The main innovative achievements of this paper are as follows: 1). The mechanism of stress engineering testing method of saw blade is explained in theory and simulation. The influence of testing parameters and stress state of saw blade on the characteristic curve of saw blade is obtained by using finite element analysis. The circular and radial stresses of circular saw blades are calculated with different roll pressure positions by theoretical formula. Different roll pressure positions: the closer the roll pressure position is to the inner hole, the greater the circumferential compressive stress in the roll pressing zone is, and the smaller the circumferential tensile stress is in the outer part; The closer the position of roll pressure is to the inner hole, the greater the radial pressure stress is, and the smaller the radial pressure stress is in the outer part. The larger the residual stress of the saw blade is, the greater the residual stress distribution can be obtained by using the smaller roll pressing radius of the saw blade.) the simulation model of roll compression tension of circular saw blade is established. The distribution of residual stress and the characteristic curve of the saw blade after roll pressing are analyzed. The results show that the transverse stiffness of the saw blade decreases during the process of roll compression. That is, the bigger the roll pressure is, the smaller the lateral stiffness of the saw blade is, and the larger the lateral stiffness of the saw blade is, the larger the variation range of the lateral stiffness of the saw blade is. Under the same pressure, the larger the radius of the roller, the greater the stiffness of the saw blade. At 62mm radius of pressing roller, 14955.8N / m 路m ~ (4)) the variation of stress circle of saw blade roll was studied by in-situ roll pressing experiment, and the roll pressure and pass times were considered respectively. The influence factors of roll pressure position and local roll pressing process are summarized, and the influence characteristics of roll pass and local roll pressure on stress circle are summarized.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TG717;TG306

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