【作者】 朱熙尘；

【导师】 李君； 杨桂江；

【作者基本信息】 吉林大学 ， 车辆工程， 2008， 硕士

【摘要】 本文针对天津一汽生产的TJ376Q汽油机,曾一度发生过机油耗不稳定的情况,对TJ376Q汽油机气缸体缸孔加工工艺进行分析。发动机的机油消耗直接影响着燃料经济性、动力性能、可靠性、使用寿命以及环保性能。而缸孔的加工质量,对发动机使用寿命乃至经济性、动力性有着极其重要的意义,特别是对解决发动机早磨和机油耗量高等问题起着至关重要的作用。本文对机油耗不稳定的现象进行原因分析。找出适合TJ376Q气缸体缸孔加工质量的评定方法,并将它们当作输入(因素),将TJ376Q发动机的机油耗作为输出(实验指标),进行正交实验设计。建立TJ376Q汽油机缸孔质量与机油耗的最优方案是对于气缸体缸孔加工质量进行优化的主要环节。更多还原

【Abstract】 Now we seek performance of engine that is high power output , low emission , low oil consumption ,compact size. Fuel consumption has influence on fuel economy , power performance ,reliability ,service life and environment protection .Cylinder bore processing quality is important for service life of engine , economy , power performance . It is extremely effect on fuel consumption and early–wear. It is complicated for evaluating standard to processing quality of cylinder bore. Technology realization is a process of combing the product with technology . It is engine design combining the maker and machinery manufacture . So optimization of cylinder bore checker is an urgent problem for domestic engine manufacture.There’s little argument today that a plateau cylinder bore finish provides the best surface for a new set of piston rings. A plateau finish is one that is relatively smooth and has lots of bearing area to support the rings, but also has enough crosshatch depth to retain oil and provide good ring lubrication, too.A plateau finish essentially duplicates a broken-in cylinder. In the old days, cylinders were honed to size, and the rings did the final finishing of the bore surface. But this required a lot of break-in time and shortened the life of the rings. With today’s thin blocks, low tension piston rings, and coated pre-lapped rings, the cylinders need to be as close to a broken-in condition as possible when the engine is first fired up, otherwise the engine may use oil and never seal properly.So what’s the best way to achieve a plateau finish? We asked a number of people in the industry and got a variety of answers. The bottom line is there is no single recipe but a number of different processes that can be used depending on the engine’s requirements and the type of honing equipment that’s being used.This paper analyzes processing technology of cylinder bore with regard to unstable fuel consumption of TJ376Q gasoline and narrates solving methods. Evaluating methods of cylinder bore processing quality of TJ376Q cylinder body are found. Orthogonal experimental design is performed during fuel consumption acting as output data. Setting optimum plan of cylinder bore quality and fuel consumption. It is an important link for cylinder bore processing quality optimization to setting optimum plan of cylinder bore quality and fuel consumption. Introduce the technology of flat honing, research and reasoning technologic parameter of honing, particularly introduce active measure momentarily about honing. Meanwhile, the paper carried out the metrical methods to the quality of mesh veins , base on present situation of manufacture, fumble and found enterprise‘s standard of external quality about honing cylinder’s hole . Can see from being hand over an experiment result, urn the rough degree of the bore with prop up a rate to obviously influence the value that the engine oil consume.Along with prop up a pass of rate to increase, the engine oil consumes to gradually decrease, but has already put slow trend. And in prop up the rate very highly of experiment, parts of air cylinders contain the trace that the surface grinds Sun and express to lubricate quantity shortage. Therefore prop up a rate control is the best choice in 70%-80%. Can obviously see from is hand over the experiment effect curve diagram, urn degree with rough bore to the influence that the engine oil consume very obvious, the coarseness spend low or lead the Gao all make the engine oil consume to go up, but consume the rough degree’s stability in 2-3 opportune moment oils can attain the best value.So, pass is hand over experimental methods, find out the engine oil consume of important factor, and, found out to the best process craft parameter.The granulation and Tp of the Cylinder bore is evaluating methods of cylinder bore processing quality of TJ376Q cylinder body are found. Orthogonal experimental design is performed during fuel consumption acting as output data. Setting optimum plan of cylinder bore quality and fuel consumption. We found that granulation come up to Rz 2-3 and Tp come up to 70%-80% is the best way of low oil consumption. Technology realization is a process of combing the product with technology.Statistical process control theory is cited. using even value-maximum difference control figure to improve the quality of products. Thus bring new & old products into hot market.更多还原