发动机装配过程中回转力矩测试缺陷分析研究
2019-10-21戎炯镭
戎炯镭



摘 要:发动机回转力矩测试通过监控曲轴旋转过程中的力矩变化,判断旋转机构摩擦副是否存在异常情况。通过回转力矩测试的大数据统计分析,设置合理的检测窗口,可以有效提前检测出粘附在轴瓦上的各类异物颗粒,将缺陷发动机控制在生产线内,降低发动机在汽车运行中的咬死的风险。同时试验数据表明回转力矩测试缺陷主要颗粒成分来源与缸体和连杆,Var4和Var2可以有效检测95%以上的力矩异常情况。
关键词:发动机;回转力矩;异物颗粒;轴瓦
中图分类号:U466 文献标识码:A 文章编号:1671-7988(2019)23-173-03
The Research for the Detection Analysis of Rotational Torque Test in Engine Assembly
Rong Jionglei
( SAIC Volkswagen Automotive CO., LTD., Shanghai 201805 )
Abstract: The engine rotational torque test judges whether there is abnormal condition of friction pair of rotating mechanism by monitoring the change of torque in the process of crankshaft rotation. By statistical analysis of large data of rotational torque test and setting reasonable detection window, all kinds of foreign particles adhering to bearing bush can be detected effectively in advance, defective engine can be controlled in production line, and the risk of engine biting in automobile operation can be reduced. At the same time, the test data show that the main particle components of rotational torque test defects are from cylinder block and connecting rod. Var4 and Var2 can effectively detect more than 95% of the abnormal moment.
Keywords: Engine; Rotational torque; Foreign matter; Bearing
CLC NO.: U466 Document Code: A Article ID: 1671-7988(2019)23-173-03
1 引言
随着发动机制造和装配技术不断进步,各发动机生产厂家积极采用先进的检测设备,对生产质量加以检测和控制,及早的发现产品制造和装配中的缺陷[1-3]。发动机装配过程中可以利用回转力矩测试设备检测曲轴与轴瓦之间是否有异常情况,如夹杂异物、零件尺寸配合异常等。
2 回转力矩测试概述
发动机回转力矩测试是评价发动机装配质量和装配过程的一个关键工序。回转力矩测试设备一般会在连杆活塞机构装配完成后的工序,可以提前发现曲轴旋转机构异常情况,完成返修,降低返修成本。
发动机回转力矩测试包括3个检测阶段和4个检测力矩窗口。
回转力矩测试阶段:
阶段1:力矩啟动阶段,曲轴旋转角度从0°到180°;
阶段2:力矩检测阶段,曲轴旋转角度从180°到900°;
阶段3:力矩回位阶段,曲轴旋转角度从900°到1080°。
回转力矩测试检测窗口:
Var1:回转力矩……
