漆包线微电阻点焊电极端部瞬态温度检测方法  

Method for Measuring Transient Temperature of Electrode Tip in Micro Resistance Spot Welding of Enamelled Wire

作　　者：容爱琼 曾家铨 邓达强 黄增好 RONG Aiqiong;ZENG Jiaquan;DENG Daqiang;HUANG Zenghao(School of Robotics Engineering,Guangzhou City University of Technology,Guangzhou 510800,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;Guangzhou JingYuan Electrical Equipment Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]广州城市理工学院机器人工程学院,广东广州510800 [2]华南理工大学机械与汽车工程学院,广东广州510640 [3]广州市精源电子设备有限公司,广东广州510700

出　　处：《热加工工艺》2022年第21期122-126,共5页Hot Working Technology

基　　金：广东省民办教育发展专项资金项目(52MJZ19001);广州城市理工学院高等教育教学改革项目(52JY210306)。

摘　　要：针对微细漆包线电阻点焊电极端部瞬态温度的检测需求及问题,选用热电偶搭建微点焊测温试验平台,构建基于岭回归的动态补偿器,以细线热电偶测温结果为温度真值,对普通热电偶测温进行补偿处理以提高其动态响应,提出基于温度与电阻关联的电极端部点焊温度间接测量方法。选用细线热电偶和普通热电偶分别在3种闭环控制模式下进行测温试验,从普通热电偶测温数据中提取多个特征并比较分析,建立并验证动态补偿器。分析电极端部温度与电阻的关系,推导电极端面焊接温度计算表达式。结果表明,所选特征组合较合理,经补偿后提高了普通热电偶对电极端部瞬态温度的检测能力;采用电阻信息可计算电极端面焊接温度,温度变化特征与点焊物理过程吻合。Aiming at the detecting demand and problem of transient temperature of electrode tip in micro resistance spot welding of enamelled wire, the platform for micro resistance spot welding temperature measurement was established by using thermocouples. Taking the temperature measured result by fine wire thermocouple as the real temperature, a dynamic compensator based on ridge regression was constructed for common thermocouple temperature measured result to improve its dynamic response. And an indirect measurement method of welding temperature at electrode tip based on the correlation between temperature and resistance was proposed. Fine wire thermocouple and common thermocouple were selected to perform temperature measurement experiments under three closed-loop control modes respectively. Several features were extracted and compared from the temperature measurement data by common thermocouple, and dynamic compensator was established and verified. The relationship between the temperature of electrode tip and its resistance was analyzed, and the formula for calculating welding temperature of electrode tip was deduced. The results show that the selected characteristics are reasonable, and the detecting ability of common thermocouple for transient temperature of electrode tip can be improved by compensation. The welding temperature of electrode tip can be deduced from resistance information, and its variation characteristics are consistent with the physical process of spot welding.

关 键 词：微电阻点焊 热电偶 瞬态温度 动态补偿 

分 类 号：TG438.2[金属学及工艺—焊接]