박판재 변형의 가열교정에서 가열면적의 영향 (Effects of Heating Conditions in the Straightening of Sheet Metal Distortion)

서지정보

· 발행기관 : 대한용접접합학회
· 수록지 정보 : 대한용접접합학회지 / 26권 / 4호 / 79 ~ 84페이지
· 저자명 : 박준형, 김재웅, 김기철, 전중환

초록

Use of sheet metal structure is increased in various fields such as automobile, aerospace and communication
equipment industry. When this structure is welded, welding distortion is generated due to the nonuniformity
of temperature distribution. Recently welding distortion becomes a matter of great importance in
the structure manufacture industry because it deteriorates the product’s quality by bringing about shape
error. Accordingly many studies for solving the problems by controlling the welding distortion are being
performed.
However, it is difficult to remove all kinds of distortion by welding process, though various kinds of
methods for reducing distortion are applied to production. Consequently, straightening process is operated if
the high precision quality is requested after welding. The local heating method induces compression plastic
deformation by thermal expansion in the heating stage and then leaves constriction of length direction in
the cooling stage. Accordingly, in the case of sheet metal structure, straightening effect is expected by
heating for the part of distortion.
This study includes numerical analysis of straightening effect by the local heating method in distortion
comes from production of welded sheet metal structure. Particularly straightening effect followed by
dimensions of heating area is analyzed according to the numerical analysis. The numerical analysis is
performed by constructing 3-dimensional finite element model for 0.4mm stainless steel-sheet metal. Results
of this study confirm that straightening effect changes as heating area increases and the optimum value of
heating area that proves the maximum straightening effect exists

영어초록

Use of sheet metal structure is increased in various fields such as automobile, aerospace and communication
equipment industry. When this structure is welded, welding distortion is generated due to the nonuniformity
of temperature distribution. Recently welding distortion becomes a matter of great importance in
the structure manufacture industry because it deteriorates the product’s quality by bringing about shape
error. Accordingly many studies for solving the problems by controlling the welding distortion are being
performed.
However, it is difficult to remove all kinds of distortion by welding process, though various kinds of
methods for reducing distortion are applied to production. Consequently, straightening process is operated if
the high precision quality is requested after welding. The local heating method induces compression plastic
deformation by thermal expansion in the heating stage and then leaves constriction of length direction in
the cooling stage. Accordingly, in the case of sheet metal structure, straightening effect is expected by
heating for the part of distortion.
This study includes numerical analysis of straightening effect by the local heating method in distortion
comes from production of welded sheet metal structure. Particularly straightening effect followed by
dimensions of heating area is analyzed according to the numerical analysis. The numerical analysis is
performed by constructing 3-dimensional finite element model for 0.4mm stainless steel-sheet metal. Results
of this study confirm that straightening effect changes as heating area increases and the optimum value of
heating area that proves the maximum straightening effect exists

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