力矩拧紧机的应用及拧紧方式、参数的选择
发布时间：2018-08-29 10:41
【摘要】：一台完整的发动机总成是由成百上千个不同的零部件组成,发动机装配的主要任务就是将这些零部件按一定的方式和要求有机的联接在一起,组成一台发动机总成。在这个联接装配过程中,操作者遇到最多的装配内容就是螺纹联接,可以说螺纹联接贯穿于发动机装配的整个过程。从另一个角度来讲就是:控制好螺纹联接(主要是拧紧力矩)也就意味为装配成功了一半以上,无论在国内还是国外,拧紧力矩的控制精度问题都是衡量发动机装配质量的一个重要标志,目前保证力矩拧紧精度的一个最有效方法就是使用组合力矩拧紧机。 本课题以本企业引进首台力矩拧紧机过程中所做的工作为基础,以连杆螺栓拧紧为例,详细讨论了使用力矩拧紧机对螺纹联接的影响如何及在螺纹联接中的应用、力矩拧紧机的拧紧方式如何的选择、以及拧紧参数的验证等过程。并结合公司新研发发动机的重要拧紧力矩在批量生产过程中不稳定等问题,通过以上的方法及实际的工作经验累计、国产件与进口件的性能对比等工作,对拧紧方式和参数的选择进行认定和验证,最终得出符合设计和实际生产要求的拧紧方式及参数。 通过以上的工作,最终将连杆螺栓的拧紧参数由15Nm+40°改为20Nm+37o、将缸体的曲轴箱螺栓力矩监控值由47.0 Nm～64.0 Nm改为50.9 Nm～67.7 Nm、确定了缸盖螺栓的多步拧紧参数第一次——20 Nm(15rpm)、第二次——40 Nm(8rpm)、第三次——转60o(8rpm)、第四次——再转60o(8rpm)。这些修改和调整后发动机研制初期存在的一些问题没有再出现,并在后续的批量装机验证中也无故障再现,本次改善解决了连杆瓦异响、力矩拧紧机报警、缸盖螺栓力矩衰减等实际问题,经分析对比为该发动机该拧紧位置的最佳拧紧方式和参数,目前这些改善已正式应用于大批量装机,为发动机的质量稳定提供了技术基础。
[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 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH131.3
本文编号：2210951
[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 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH131.3
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