试漏标准件泄漏率检测方法分析

吴根强¹，张贺¹，石刚¹，陈杰²

1.宁波吉利罗佑发动机零部件有限公司，浙江 宁波   3153402;

2.浙江吉润汽车有限公司宁波杭州湾分公司，浙江 宁波   315340

摘要：为准确判断发动机零部件生产线上试漏设备的工作状态，结合直线式、直线分段式、直线分段平移式、根式函数分段式4种泄漏率检测方法确定合格标准件、不合格标准件的泄漏率。结果表明：采用直线式检测方法，允许泄漏率变化较小时，标准件泄漏率偏差过小，导致标准件判断结果不准确；采用直线分段式检测方法，泄漏率偏差区间设置混乱且合理性较差；采用直线分段平移式检测方法，不满足允许泄露率变化较大时，标准件泄漏率偏差变化应较小的要求；根式函数分段式检测方法符合标准件泄漏率偏差要求，当允许泄漏率不大于7 cm³/min时，标准泄漏率偏差与允许泄漏率之间为相关因数为0.3的线性关系；当允许泄漏率大于7 cm³/min时，标准泄漏率偏差与允许泄漏率之间为相关因数为0.8的根式函数关系。

关键词：标准件；允许泄漏率；标准件泄漏率；试漏设备

Analysis of leakage rate detection method for standard parts testing

WU Genqiang¹, ZHANG He¹, SHI Gang¹, CHEN Jie²

1.Ningbo Geely Royal Engine component Co., Ltd., Ningbo 315340, China；

2.Ningbo Hangzhou Bay Branch, Zhejiang Jirun Automobile Co., Ltd., Ningbo 315340, China

Abstract: To accurately assess the operational status of leak testing equipment on the production line for engine parts, four leakage rate detection methods, linear method, linear segmented method, linear segmented translational method, and root function segmented methodare combined to determine the leakage rates of qualified and non-qualified standard parts. The results indicate that when using the linear method, a small allowable variation in leakage rate leads to an excessively small deviation in the leakage rate of standard parts, resulting in inaccurate judgment of standard parts. The linear segmented method suffers from a chaotic setup of the leakage rate deviation range and poor rationality. The linear segmented translational method does not meet the requirement for a small deviation in leakage rate when the allowable leakage rate varies significantly. The root function segmented method meets the deviation requirements for standard part leakage rates. When the allowable leakage rate does not exceed 7 cm³/min, the relationship between the standard leakage rate deviation and the allowable leakage rate is linear with a correlation factor of 0.3. When the allowable leakage rate exceeds 7 cm³/min, the relationship becomes a root function with a correlation factor of 0.8.

Keywords: standard part; allowable leakage rate; standard part leakage rate; leak testing equipment