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나사 조립 방식의 자동차 부품(제품)의 조립 토크와 축력 연관성 연구
전명건(Myounggun Jeon),김경현(KyeongHyeon Kim),고재천(Jaechun Go),서준원(Junwon Seo),김정택(Jungtaek Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
A lot of products for vehicle assembled using screw. To satisfy the required performance and function, the assembly management method is very important. Most products and applications with screw assembly are managed and regulated based on tightening torque. However, the tightening(assembly) torque is not accurate because of the tool or user. In this paper, we study and suggest the special assembly management method using tightening axial force measurement. Firstly, we define the assembly torque to satisfy the function of the Oxygen sensor(Lambda sensor). Add then, the tightening axial force matched with assembly torque is confirmed with analysis and experiment. As a result, the tightening axial force of Oxygen sensor is required over the 8.1 kN. And, we propose the portable tightening axial force measurement method in the state of vehicle assembly. So, we expect to be able to define efficient and accurate assembly management for various products with screw part.
나사 조립 방식의 자동차 부품(제품)의 조립 조건 최적화를 위한 조립 토크 및 축력 변형 경향성 연구
전명건(Myounggun Jeon),김경현(KyeongHyeon Kim),김정택(Jungtaek Kim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
In this paper, we study to optimize the assembly condition of Oxygen sensor(LAMBDA sensor) with screw assembly part. Its requirements are controllability on vehicle or engine product assembly line and confidentiality of assembly contact surface. The vehicle or engine product assembly line can manage only assembly torque, but the main factor for airtightness is assembly clamping force. Therefore, in this study, the relationship between Oxygen sensor assembly torque and clamping force is evaluated. As a result, it’s confirmed that the clamping force decrease with Oxygen sensor is 10~20% of the decrease in the assembly torque. As a result, the Oxygen sensor can optimize assembly condition only with assembly torque and do not need to manage the assembly clamping force. Through an additional leakage test, it’s confirmed that the optimal assembly condition for Oxygen sensor over an assembly torque of 40 N.m.