자동차용 에어컨호스의 스웨이징 공정에 대한 유한요소해석

Abstract

Abstract

The automotive air conditioning hose is used for connecting the components of air conditioner in a vehicle. The hose is usually manufactured by the swaging process to connect the rubber hose with the metal fitting at the end of the hose. The swaging process leads to various stress and strain configurations in the hose, which give a critical effect on the hose performance. In the study, finite element analyses for the deformation characteristics of an automotive air-conditioning hose during the manufacturing process are performed in consideration of friction coefficient in order to investigate the stress and the strain levels of the hose assembly components. In actual manufacturing process, the friction is presented between metal components and rubber materials. It is very difficult to determine the friction coefficient which is dependent on the various parameters, such as surface roughness and lubrication. In this study, firstly the friction coefficients are assumed to be 0.1, 0.2, and 0.3. And then the results are compared with the experimental results of final nipple diameter to determine the valid friction coefficient. The results are compared with the frictionless case so as to check the differences of the results and decide the exact friction coefficient by comparing the analytical deformation value with the measurement data. Because the rubber layers of the hose have an important role in the hose efficiency, the result interpretations are focused on the stress and the strain variations of the hose layers contacted with the metal pipes. The material properties were obtained from experimental data, and the contact conditions were used in consideration of the real manufacturing process.