【摘要】：錐形聯(lián)接結(jié)構(gòu)主要用于高壓介質(zhì)的密封,其密封原理是利用金屬的塑性變形,在密封接觸面形成封閉的密封環(huán)。雖然錐形聯(lián)接結(jié)構(gòu)在工程實(shí)際中應(yīng)用廣泛,但是對于結(jié)構(gòu)參數(shù)的設(shè)計主要是依靠經(jīng)驗(yàn),沒有行之有效的分析方法和可靠的設(shè)計理論來指導(dǎo)實(shí)際工程應(yīng)用。 參數(shù)設(shè)計的不合理性和零件形位誤差的不確定性給密封帶來了困難,為了解決錐形聯(lián)接結(jié)構(gòu)的密封性問題,本文采用數(shù)值模擬方法,對錐形聯(lián)接結(jié)構(gòu)的密封性能進(jìn)行了深入的研究。針對制動管路錐形聯(lián)接結(jié)構(gòu)密封失效的問題進(jìn)行了改進(jìn)設(shè)計,研究成果對類似的密封結(jié)構(gòu)設(shè)計具有一定的實(shí)際指導(dǎo)意義,也能為我國的汽車自主研發(fā)和創(chuàng)新設(shè)計作出貢獻(xiàn)。 本文的主要工作及成果如下： (1)運(yùn)用有限元軟件ANSYS對錐形聯(lián)接結(jié)構(gòu)的密封性能進(jìn)行了數(shù)值分析,得到了喇叭口內(nèi)錐角、喇叭口厚度、喇叭口圓角半徑、凸臺外徑與密封面接觸壓力和喇叭口等效應(yīng)力的關(guān)系曲線,并確定滿足密封時,上述各因素的合理取值范圍。 (2)對喇叭口存在同軸度誤差和輪廓度誤差的情況進(jìn)行模擬分析,確定了同軸度、輪廓度誤差與密封面接觸壓力和等效應(yīng)力的關(guān)系,基于密封原理,確定了不同扭矩下,所允許的同軸度和輪廓度公差范圍。 (3)通過中心復(fù)合試驗(yàn)設(shè)計,建立了結(jié)構(gòu)參數(shù)與密封性能指標(biāo)的數(shù)學(xué)模型,并運(yùn)用多目標(biāo)函數(shù)優(yōu)化方法,結(jié)合matlab搜索工具進(jìn)行求解分析,確定了密封性能達(dá)到最優(yōu)時,各結(jié)構(gòu)參數(shù)的取值,從而實(shí)現(xiàn)對錐形聯(lián)接結(jié)構(gòu)的改進(jìn)設(shè)計。
[Abstract]:Conical connection structure is mainly used for sealing of high pressure medium. Its sealing principle is to form a closed sealing ring on the sealing contact surface by using the plastic deformation of metal. Although conical connection structure is widely used in engineering practice, the design of structural parameters mainly depends on experience, and there is no effective analysis method and reliable design theory to guide the practical engineering application. The irrationality of parameter design and the uncertainty of part shape and position error bring difficulties to seal. In order to solve the sealing problem of conical connection structure, numerical simulation method is used in this paper. The sealing performance of conical connection structure is deeply studied. Aiming at the problem of sealing failure of conical connection structure of brake pipeline, the research results have certain practical guiding significance for similar seal structure design, and can also contribute to the independent research and development and innovative design of automobile in our country. The main work and achievements of this paper are as follows: (1) the sealing performance of conical connection structure is analyzed by using finite element software ANSYS, and the cone angle, horn thickness and fillet radius of horn mouth are obtained. The relationship curve between the outer diameter of the raised platform and the contact pressure of the sealing surface and the equivalent stress of the horn mouth is determined, and the reasonable range of the above factors is determined when the sealing is satisfied. (2) the coaxiality error and profile error of horn mouth are simulated and analyzed, and the relationship between coaxiality, profile error and contact pressure and equivalent stress of sealing surface is determined. based on sealing principle, the relationship between coaxiality and profile error and contact pressure and equivalent stress of sealing surface is determined. The allowable tolerance range of coaxiality and profile. (3) through the central composite test design, the mathematical model of structural parameters and sealing performance index is established, and the multi-objective function optimization method and matlab search tool are used to solve and analyze, and it is determined that the sealing performance reaches the optimal. The values of each structural parameter are used to realize the improved design of conical connection structure.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH136

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