本文選題：螺紋聯(lián)接 + 預(yù)緊力��； 參考：《武漢理工大學(xué)》2012年碩士論文

【摘要】：螺紋聯(lián)接結(jié)構(gòu)作為汽車總裝里面大量使用的基本結(jié)構(gòu),它的可靠性關(guān)系到汽車的總體性能好壞,特別是底盤部分的螺紋聯(lián)接結(jié)構(gòu),更是關(guān)系到汽車的安全性能。螺紋聯(lián)接結(jié)構(gòu)保證其可靠性的關(guān)鍵在于螺紋緊固件的合理選擇以及預(yù)緊力的合理控制。然而,由于國內(nèi)汽車行業(yè)發(fā)展較晚,在螺紋緊固件的選擇和預(yù)緊力的控制方面還存在不足。如預(yù)緊力分布散差過大,為保證螺紋的可靠聯(lián)接,在設(shè)計(jì)時通常會選用比較大的安全系數(shù),這樣一來,雖然不會導(dǎo)致過載破壞,但是螺紋緊固件型號很大而所服役的預(yù)緊力相對很低,這樣不僅不利于充分發(fā)揮螺紋緊固件的效能,同時預(yù)緊力相對過小,也不利于螺紋緊固件的抗松動性能和抗疲勞性能的充分發(fā)揮。同時,擰緊工藝的好壞也關(guān)系螺紋聯(lián)接的質(zhì)量好壞,倘若擰緊過程處于未受控狀態(tài),則擰緊之后螺紋聯(lián)接的質(zhì)量也會出現(xiàn)許多不可控的結(jié)果。 本文從保證螺紋聯(lián)接可靠性的角度出發(fā),通過理論和試驗(yàn)相結(jié)合的方法,對螺紋緊固件的設(shè)計(jì)和擰緊工藝進(jìn)行了系統(tǒng)的分析,從而為螺紋緊固件的合理設(shè)計(jì)選擇以及預(yù)緊力的合理控制提供了一定的理論基礎(chǔ)。 本文的研究內(nèi)容有以下幾個方面： (1)研究了預(yù)緊力的控制方法,并基于應(yīng)力-強(qiáng)度干涉理論,研究了螺紋聯(lián)接可靠性的數(shù)學(xué)原理,并提出了可靠性的計(jì)算方法。 (2)通過擰緊試驗(yàn)得到了影響扭矩系數(shù)的關(guān)鍵因素,并提出了一種扭矩系數(shù)控制策略；研究了可靠性設(shè)計(jì)的經(jīng)濟(jì)優(yōu)越性,至此,從技術(shù)和經(jīng)濟(jì)上說明了可靠性設(shè)計(jì)的優(yōu)越性。 (3)為確保擰緊工藝的可靠性,運(yùn)用統(tǒng)計(jì)過程控制的方法對螺紋聯(lián)接的擰緊過程進(jìn)行了系統(tǒng)分析,提出了保證擰緊工具精度的工藝流程,并且給出了靜態(tài)扭矩控制圖的繪制流程。
[Abstract]:As the basic structure used in automobile assembly, the reliability of threaded connection structure is related to the overall performance of the automobile, especially the thread connection structure of the chassis part, and also to the safety performance of the automobile. The key to ensure the reliability of thread connection structure lies in the reasonable selection of thread fastener and the reasonable control of pretightening force. However, due to the late development of domestic automobile industry, there are still shortcomings in the selection of threaded fasteners and the control of pretightening force. If the spread of pretightening force distribution is too large, in order to ensure the reliable connection of threads, a relatively large factor of safety is usually used in the design, so that, although it does not cause overload damage, But the type of threaded fastener is very large and the pretightening force in service is relatively low, which is not only unfavorable for giving full play to the efficiency of threaded fasteners, but also relatively small. It is also unfavorable to the loosening and fatigue resistance of thread fasteners. At the same time, the quality of screw thread connection is also related to the tightening process. If the tightening process is in an uncontrolled state, the quality of thread connection after tightening will also appear many uncontrollable results. In this paper, from the point of view of ensuring the reliability of thread connection, the design and tightening process of thread fastener are systematically analyzed by combining theory with experiment. It provides a theoretical basis for reasonable design and selection of thread fasteners and reasonable control of pretightening force. The research contents of this paper are as follows: 1) the control method of pretightening force is studied. Based on the stress-strength interference theory, the mathematical principle of thread connection reliability is studied, and the calculation method of reliability is put forward. 2) the key factors affecting torque coefficient are obtained by tightening test, and a torque coefficient control strategy is put forward, and the economic superiority of reliability design is studied, and the superiority of reliability design is explained technically and economically. In order to ensure the reliability of tightening process, the tightening process of screw thread connection is analyzed systematically by statistical process control method, and the process flow to ensure the precision of tightening tool is put forward, and the drawing flow of static torque control diagram is given.
【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】：TH131.3

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本文編號：1801727