【摘要】：一臺(tái)完整的發(fā)動(dòng)機(jī)總成是由成百上千個(gè)不同的零部件組成,發(fā)動(dòng)機(jī)裝配的主要任務(wù)就是將這些零部件按一定的方式和要求有機(jī)的聯(lián)接在一起,組成一臺(tái)發(fā)動(dòng)機(jī)總成。在這個(gè)聯(lián)接裝配過(guò)程中,操作者遇到最多的裝配內(nèi)容就是螺紋聯(lián)接,可以說(shuō)螺紋聯(lián)接貫穿于發(fā)動(dòng)機(jī)裝配的整個(gè)過(guò)程。從另一個(gè)角度來(lái)講就是:控制好螺紋聯(lián)接(主要是擰緊力矩)也就意味為裝配成功了一半以上,無(wú)論在國(guó)內(nèi)還是國(guó)外,擰緊力矩的控制精度問(wèn)題都是衡量發(fā)動(dòng)機(jī)裝配質(zhì)量的一個(gè)重要標(biāo)志,目前保證力矩?cái)Q緊精度的一個(gè)最有效方法就是使用組合力矩?cái)Q緊機(jī)。 本課題以本企業(yè)引進(jìn)首臺(tái)力矩?cái)Q緊機(jī)過(guò)程中所做的工作為基礎(chǔ),以連桿螺栓擰緊為例,詳細(xì)討論了使用力矩?cái)Q緊機(jī)對(duì)螺紋聯(lián)接的影響如何及在螺紋聯(lián)接中的應(yīng)用、力矩?cái)Q緊機(jī)的擰緊方式如何的選擇、以及擰緊參數(shù)的驗(yàn)證等過(guò)程。并結(jié)合公司新研發(fā)發(fā)動(dòng)機(jī)的重要擰緊力矩在批量生產(chǎn)過(guò)程中不穩(wěn)定等問(wèn)題,通過(guò)以上的方法及實(shí)際的工作經(jīng)驗(yàn)累計(jì)、國(guó)產(chǎn)件與進(jìn)口件的性能對(duì)比等工作,對(duì)擰緊方式和參數(shù)的選擇進(jìn)行認(rèn)定和驗(yàn)證,最終得出符合設(shè)計(jì)和實(shí)際生產(chǎn)要求的擰緊方式及參數(shù)。 通過(guò)以上的工作,最終將連桿螺栓的擰緊參數(shù)由15Nm+40°改為20Nm+37o、將缸體的曲軸箱螺栓力矩監(jiān)控值由47.0 Nm～64.0 Nm改為50.9 Nm～67.7 Nm、確定了缸蓋螺栓的多步擰緊參數(shù)第一次——20 Nm(15rpm)、第二次——40 Nm(8rpm)、第三次——轉(zhuǎn)60o(8rpm)、第四次——再轉(zhuǎn)60o(8rpm)。這些修改和調(diào)整后發(fā)動(dòng)機(jī)研制初期存在的一些問(wèn)題沒(méi)有再出現(xiàn),并在后續(xù)的批量裝機(jī)驗(yàn)證中也無(wú)故障再現(xiàn),本次改善解決了連桿瓦異響、力矩?cái)Q緊機(jī)報(bào)警、缸蓋螺栓力矩衰減等實(shí)際問(wèn)題,經(jīng)分析對(duì)比為該發(fā)動(dòng)機(jī)該擰緊位置的最佳擰緊方式和參數(shù),目前這些改善已正式應(yīng)用于大批量裝機(jī),為發(fā)動(dòng)機(jī)的質(zhì)量穩(wěn)定提供了技術(shù)基礎(chǔ)。
[Abstract]:A complete engine assembly is made up of hundreds of different parts. The main task of engine assembly is to combine these parts organically in a certain way and requirements to form an engine assembly. In this connection assembly process, the operator encountered most of the assembly content is thread connection, it can be said that thread connection runs through the whole process of engine assembly. On the other hand, the control of thread coupling (mainly tightening torque) means that more than half of the assembly has been achieved, both at home and abroad, The control accuracy of tightening torque is an important symbol to evaluate the assembly quality of engine. At present, the most effective method to ensure the precision of torque tightening is to use the combined torque tightening machine. Based on the work done in the process of introducing the first torque tightening machine in our enterprise and taking the tightening of connecting rod bolts as an example, this paper discusses in detail the influence of torque tightening machine on thread connection and its application in thread connection. How to choose the tightening mode of torque tightening machine and how to verify the tightening parameters. Combined with the problems of instability of the important tightening torque of the newly developed engine in the company during mass production, through the above methods and the accumulative working experience, the performance comparison between the domestic parts and the imported parts, etc. The selection of tightening mode and parameters is confirmed and verified. Finally, the tightening mode and parameters that meet the requirements of design and production are obtained. Through the above work, Finally, the tightening parameter of connecting rod bolt is changed from 15Nm 40 擄to 20Nm 37o. and the torque monitoring value of crankcase bolt in cylinder block is changed from 47.0 Nm~64.0 Nm to 50.9 Nm~67.7 Nm,. The multistep tightening parameter of cylinder head bolt is determined for the first time 20 Nm (15rpm), the second time. 40 Nm (8rpm), third to 60o (8rpm), fourth to 60o (8rpm). After these modifications and adjustments, some problems existing in the initial stage of the engine development did not appear again, and there was no trouble reappearance in the subsequent batch assembly verification. This improvement has solved the abnormal noise of the connecting rod bush and the alarm of the torque tightening machine. The practical problems such as the torque attenuation of cylinder head bolts are analyzed and compared as the optimum tightening mode and parameters of the tightening position of the engine. These improvements have been formally applied to mass loaders and provide a technical basis for the quality stability of the engine.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH131.3

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本文編號(hào)：2210951