本文選題：連桿襯套　切入點：強力旋壓　出處：《中北大學》2017年碩士論文

【摘要】：柴油機連桿襯套在工作過程中主要受到兩個力交替作用:氣缸的爆發(fā)壓力和連桿的慣性力,工作條件非常惡劣,且維修成本高,因此對連桿襯套的工作性能要求非常之高。經過強力旋壓工藝加工的連桿襯套具有綜合性能好、疲勞強度高、承載能力大等優(yōu)點,因此,強力旋壓工藝也被視為是柴油機連桿襯套的理想的加工工藝。但是,在強力旋壓工藝進行連桿襯套的加工過程中,由于不同工藝參數、金屬堆積、金屬流動不均勻等各種可控以及不可控因素,導致加工后連桿襯套表面會產生殘余應力。殘余應力的存在則導致連桿襯套的尺寸精度、形狀誤差、疲勞強度、靜強度、硬度等性能發(fā)生改變,進而影響到柴油機的使用壽命,因此,研究強力旋壓加工后殘余應力的分布規(guī)律、強力旋壓工藝參數對殘余應力的影響規(guī)律以及減小殘余應力,對提高連桿襯套的使用壽命指導實際生產有著重要意義。本文以錫青銅(QSn7-0.2)為原材料,以強力旋壓連桿襯套為研究對象,基于彈塑性有限元,對強力旋壓加工過程以及加工后的連桿襯套表面殘余應力進行有限元仿真。主要研究內容:(1)基于金屬彈塑性有限元,采用ABAQUS有限元仿真軟件,建立了三旋輪錯距旋壓的仿真模型,并進行了有限元仿真;(2)對連桿襯套的成形過程進行了分析,并對仿真成形過程中的軸向、周向、徑向殘余應力的形成過程進行了研究;(3)通過設計仿真方案并進行強力旋壓成形過程的仿真,得到多組數據,基于此數據,分析了強力旋壓工藝參數對殘余應力的影響規(guī)律(4)通過設計正交試驗,分析了強力旋壓加工工藝參數對殘余應力的影響順序,并驗證了仿真的可靠性。研究結果表明,減薄率、進給比以及主軸轉度等工藝參數對連桿襯套表面殘余應力有著重要影響,其中減薄率影響最為明顯,通過ABAQUS可進行連桿襯套的成形過程仿真,可在實際生產中降低試驗成本、節(jié)省時間。
[Abstract]:The connecting rod bushing of diesel engine is mainly subjected to two forces alternately in the working process: the burst pressure of the cylinder and the inertia force of the connecting rod, the working conditions are very bad, and the maintenance cost is high. Therefore, the working performance of the connecting rod bushing is very high. The connecting rod bushing processed by the strong spinning process has the advantages of good comprehensive performance, high fatigue strength, high bearing capacity and so on. The strong spinning process is also regarded as the ideal processing technology for the connecting rod bushing of diesel engine. However, during the processing of the connecting rod bushing in the strong spinning process, the metal accumulates due to the different technological parameters. Various controllable and uncontrollable factors, such as uneven metal flow, lead to residual stress on the surface of connecting rod bushing after machining. The existence of residual stress leads to dimensional accuracy, shape error, fatigue strength and static strength of connecting rod bushing. The hardness and other properties are changed, which will affect the service life of diesel engine. Therefore, the distribution law of residual stress after strong spinning, the influence of strength spinning process parameters on residual stress and the reduction of residual stress are studied. It is of great significance to improve the service life of connecting rod bushing and guide the practical production. In this paper, tin bronze QSn7-0.2) is used as raw material, and strong spinning link bushing is used as research object, based on elastic-plastic finite element method. The finite element simulation of the machining process and the surface residual stress of the connecting rod bushing is carried out. The main contents of this paper are as follows: (1) based on the metal elastoplastic finite element method, the ABAQUS finite element simulation software is used to simulate the residual stress of the connecting rod bushing. The simulation model of three-wheel offset spinning is established, and finite element simulation is carried out to analyze the forming process of connecting rod bushing, and the axial and circumferential directions in the simulation process are analyzed. The forming process of radial residual stress is studied. The influence of strength spinning process parameters on residual stress is analyzed. (4) by designing orthogonal test, the influence sequence of process parameters on residual stress is analyzed, and the reliability of simulation is verified. The research results show that the thinning rate is reduced. The feed ratio and spindle rotation have important influence on the surface residual stress of connecting rod bushing, among which the thinning rate is the most obvious. Through ABAQUS, the forming process of connecting rod bushing can be simulated, and the test cost can be reduced in actual production. Save time.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TK426;TG306

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