本文關(guān)鍵詞：錫青銅連桿襯套錯距旋壓關(guān)鍵工藝參數(shù)對成形質(zhì)量的分析及其優(yōu)化　出處：《中北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連桿襯套 錯距旋壓 徑向力均方差 內(nèi)徑精度 形狀誤差

【摘要】：連桿襯套是連接發(fā)動機(jī)連桿小端與活塞銷的關(guān)鍵零部件,在發(fā)動機(jī)工作過程中,連桿襯套不僅受到與其配合的連桿小端及活塞銷的摩擦作用,同時(shí)高溫環(huán)境及交變應(yīng)力的影響也對其性能提出了很高的要求。連桿襯套一般采用錯距旋壓成形工藝制造,作為一種先進(jìn)的表面塑性強(qiáng)化成形工藝,采用錯距旋壓強(qiáng)化后的連桿襯套,疲勞強(qiáng)度、承載能力等性能均能達(dá)到工作要求。主要存在的問題是經(jīng)錯距旋壓成形后工件的內(nèi)徑精度不夠理想,必須保證足夠的加工余量以完成后續(xù)的精車工序。有時(shí)會因?yàn)楣に噮?shù)設(shè)置不合理等原因,導(dǎo)致工件口部擴(kuò)徑嚴(yán)重以致內(nèi)徑尺寸無法滿足后續(xù)精車余量的要求,造成人力物力資源的浪費(fèi)。同時(shí)由于形狀誤差的存在,后續(xù)精車工序中工件表面各處的切削深度各不相同,其表面硬度、金相組織、殘余應(yīng)力等存在較大的差異,導(dǎo)致產(chǎn)品使用可靠性大大降低。本文采用數(shù)值模擬方法建立了錫青銅連桿襯套錯距旋壓有限元仿真模型,并通過實(shí)驗(yàn)驗(yàn)證了該模型的可靠性。在此基礎(chǔ)上,采用單因素試驗(yàn)設(shè)計(jì)方法研究了減薄率、進(jìn)給比、首輪壓下比、軸向錯距、主軸轉(zhuǎn)速對錯距旋壓成形過程中三旋輪徑向旋壓力、軸向旋壓力、切向旋壓力、徑向力均方差及旋壓成形后工件內(nèi)徑精度、圓度誤差、直線度誤差的影響規(guī)律。根據(jù)單因素試驗(yàn)分析結(jié)果及實(shí)際生產(chǎn)情況,確定了以進(jìn)給比、首輪壓下比、軸向錯距為試驗(yàn)因素,以三旋輪徑向力均方差、工件內(nèi)徑公差、外表面圓度誤差為優(yōu)化指標(biāo)的正交試驗(yàn)設(shè)計(jì)方案,對正交試驗(yàn)方案中各因素水平組合進(jìn)行仿真計(jì)算,并獲得了各試驗(yàn)組合下三旋輪徑向力均方差、工件內(nèi)徑公差、外表面圓度誤差的數(shù)值。最后基于正交試驗(yàn)設(shè)計(jì)的直觀分析和綜合平衡法對試驗(yàn)結(jié)果進(jìn)行分析,得到了最優(yōu)的工藝參數(shù)組合。
[Abstract]:The connecting rod bushing is the key component to connect the small end of the connecting rod with the piston pin. In the working process of the engine, the connecting rod bushing is not only affected by the friction between the small end of the connecting rod and the piston pin. At the same time the influence of high temperature environment and alternating stress also put forward very high requirements for its performance. The connecting rod bushing is generally manufactured by staggered spinning forming process as an advanced surface plastic strengthening forming process. The performance of connecting rod bushing strengthened by staggered spinning, fatigue strength and bearing capacity can meet the working requirements. The main problem is that the inner diameter precision of the workpiece formed by staggered spinning is not ideal. It is necessary to ensure sufficient machining allowance to complete the subsequent finishing process. Sometimes, due to unreasonable setting of process parameters, the diameter of the workpiece mouth is so serious that the dimension of the inner diameter can not meet the requirements of the spare capacity of the subsequent finishing car. At the same time, due to the existence of shape error, the cutting depth of various parts of the workpiece surface in the subsequent finishing process is different, its surface hardness, metallographic organization. There are great differences in residual stress and so on, which results in a great decrease in the reliability of the product. In this paper, the finite element simulation model of the dislocation distance of the tin bronze connecting rod bushing is established by numerical simulation method. The reliability of the model is verified by experiments. On the basis of this, the thinning rate, feed ratio, first wheel pressure ratio and axial offset are studied by single factor experimental design method. In the process of spin-forming, the radial rotation pressure, axial rotation pressure, tangential rotation pressure, radial force mean square deviation, the precision of inner diameter and roundness of the workpiece after spinning. According to the single factor test results and actual production conditions, the feed ratio, the first wheel pressure ratio, the axial offset are determined as the test factors, and the radial force mean square deviation of the three rotating wheels is taken as the test factor. The design scheme of orthogonal test with the tolerance of inner diameter of workpiece and roundness error of outer surface as the optimization index is simulated and calculated for the horizontal combination of various factors in the orthogonal test scheme. The values of radial force mean square deviation, inner diameter tolerance of workpiece and roundness error of outer surface are obtained. Finally, the test results are analyzed based on the intuitive analysis of orthogonal test design and the comprehensive balance method. The optimal combination of process parameters is obtained.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG306

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