本文關(guān)鍵詞： 裝配式凸輪軸 鋼球擴管聯(lián)接 多道次擴管工藝 可靠性設(shè)計 數(shù)值模擬　出處：《吉林大學》2012年碩士論文　論文類型：學位論文

【摘要】：裝配式凸輪軸技術(shù)是近年來迅速發(fā)展并得到廣泛應用的一種新型凸輪軸生產(chǎn)技術(shù)，其連接技術(shù)是核心技術(shù)。這種技術(shù)較好的將產(chǎn)品設(shè)計、材料匹配和性能優(yōu)化結(jié)合起來，具有輕量化、材料優(yōu)化、精密制造、柔性化生產(chǎn)等優(yōu)勢，符合現(xiàn)代汽車技術(shù)發(fā)展的要求。 目前，裝配式凸輪軸的聯(lián)接技術(shù)種類很多，各具優(yōu)缺點。本文以某汽車公司的V348裝配式凸輪軸為典型樣件，進行硬質(zhì)鋼球擴管聯(lián)接技術(shù)的研究，結(jié)合試驗和數(shù)值模擬對聯(lián)接工藝參數(shù)和聯(lián)接強度進行分析，并進行優(yōu)化設(shè)計和可靠性研究；創(chuàng)新性提出和研究了多道次硬質(zhì)鋼球擴管聯(lián)接工藝(Multi-Pass TubeExpanding Process)；并對梯形鍵徑向聯(lián)接和電磁擴管聯(lián)接技術(shù)在裝配式凸輪軸的應用原理及可行性進行了初步探討。 由于機械工業(yè)對于節(jié)能和環(huán)保的高要求，隨著對汽車性能要求的不斷提高，汽車零部件的加工技術(shù)也向著柔性化加工、輕量化、性能可靠等趨勢發(fā)展。而凸輪軸作為發(fā)動機中的關(guān)鍵構(gòu)件，因此，研究和發(fā)展裝配式凸輪軸技術(shù)已成為重要的課題。 本文的主要工作及取得的成果如下： (1)對比分析了裝配式凸輪軸的幾種聯(lián)接技術(shù)，根據(jù)V348裝配式凸輪軸技術(shù)參數(shù)和要求，分析了硬質(zhì)鋼球擴管聯(lián)接過程；對凸輪和軸管進行材料匹配研究，以及平面應變狀態(tài)下擴管聯(lián)接彈塑性力學解析。 (2)對V348凸輪軸鋼球擴管聯(lián)接過程進行數(shù)值模型創(chuàng)建；對材料模型進行分析和優(yōu)化選擇等關(guān)鍵技術(shù)問題的處理，并進行了鋼球擴管聯(lián)接實驗及扭轉(zhuǎn)實驗，對實驗結(jié)果和數(shù)值模擬結(jié)果對比，表明數(shù)值模擬的有效性，可較好反應冷擠壓擴管聯(lián)接過程。 (3)利用數(shù)值模擬方法對鋼球擴管聯(lián)接技術(shù)進行工藝分析、工藝參數(shù)優(yōu)化設(shè)計。系統(tǒng)分析了凸輪內(nèi)孔邊倒角半徑、初始裝配間隙、過盈量、軸管壁厚和加載速度等主要參數(shù)對聯(lián)接強度的影響；對其聯(lián)接扭轉(zhuǎn)強度和疲勞強度進行理論分析。 (4)對多道次加載擴管聯(lián)接進行理論和數(shù)值模擬分析，，選用雙道次加載方式可以優(yōu)化擴管聯(lián)接工藝，具有較好的聯(lián)接可靠性。 (5)對滾花法聯(lián)接凸輪軸進行疲勞可靠性分析，結(jié)果表明滾花壓配聯(lián)接技術(shù)對材料許用疲勞應力σ要求較高；初步探索了高能率電磁成形裝配式凸輪軸技術(shù)及可行性。 本文對擴管工藝裝配凸輪軸進行了徑向平面內(nèi)的擴管力學分析；理論分析硬質(zhì)鋼球擴管裝配凸輪軸聯(lián)接原理；通過數(shù)值模擬分析了裝配式凸輪軸的工藝參數(shù)對聯(lián)接質(zhì)量的影響，并為V348凸輪軸的擴管裝配聯(lián)接提供了依據(jù)。
[Abstract]:Assembly camshaft technology is a new type of camshaft production technology which has been developed rapidly and widely used in recent years. Its connection technology is the core technology, which combines product design, material matching and performance optimization. Light weight, material optimization, precision manufacturing, flexible production and other advantages, meet the requirements of modern automotive technology development. At present, there are many kinds of assembly camshaft connection technology, each has its own advantages and disadvantages. This paper takes V348 assembly camshaft of a car company as a typical sample to study the connection technology of rigid steel ball expansion tube. Combined with test and numerical simulation, the parameters and strength of connection are analyzed, and the optimum design and reliability are studied. Multi-pass TubeExpanding TubeExpanding process is innovatively proposed and studied, and the application principle and feasibility of trapezoid key radial connection and electromagnetic expansion connection technology in fabricated camshaft are discussed preliminarily. Due to the high requirements of the mechanical industry for energy saving and environmental protection, with the continuous improvement of the requirements for the performance of the automobile, the processing technology of automobile parts is also oriented to flexible processing and lightweight. Camshaft is the key component of engine. Therefore, the research and development of assembly camshaft technology has become an important subject. The main work and achievements of this paper are as follows:. According to the technical parameters and requirements of V348 assembled camshaft, the connection process of rigid steel ball expansion tube is analyzed, and the material matching between cam and shaft tube is studied. And the elastic-plastic mechanics analysis of the expanded tube connection under the plane strain state. (2) the numerical model of V348 camshaft steel ball expansion connection is established, and the key technical problems such as material model analysis and optimization selection are dealt with, and the experiments of steel ball expanding pipe connection and torsion are carried out. The comparison between the experimental results and the numerical simulation results shows that the numerical simulation is effective and can well reflect the cold extruded tube expansion process. Using numerical simulation method to analyze the technology of steel ball expanding pipe connection and optimize the design of process parameters. The chamfering radius, initial assembly clearance, interference quantity of cam inner hole are analyzed systematically. The influence of main parameters such as axial tube wall thickness and loading speed on the connection strength is analyzed theoretically and the connection torsional strength and fatigue strength are analyzed theoretically. 4) the theory and numerical simulation analysis of multi-pass loading tube expansion connection are carried out. The technology of expanding tube connection can be optimized by using double pass secondary loading mode, and the connection reliability is good. (5) the fatigue reliability analysis of camshaft with knurling method is carried out, the results show that the allowable fatigue stress 蟽 of material is high by knurling fitting technology, and the technology and feasibility of high energy rate electromagnetic forming assembly camshaft are preliminarily explored. In this paper, the mechanism of tube expansion in radial plane is analyzed, and the connection principle of rigid steel ball tube assembly camshaft is analyzed theoretically. The influence of process parameters of assembled camshaft on the connection quality is analyzed by numerical simulation, and the basis for assembly connection of V348 camshaft is provided.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH133.2

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