In commercial vehicle, sub-frame which equipped in main frame supporting dump deck and oil tanker. This is the main structure for all equipment which including joint function. Sub-frame is made by welding process, this susceptible to deform and crack by its longitudinal size. Also various kind of sub-frame make it difficult to standardization in manufacturing process and exclusive jig is not adapted yet. Frame size is over 6~8m and weight is more than 300kg this make re-work more difficult. If manufacturing company made precise sub-frame, this is not only convenient for customers but also save the company money by reducing the working time. In this study manufacture the sub-frame be suitable for its main function and develop exclusive welding jig for obtain checking fixture function as well.

Abstract
 1. 서론
 2. 연구방법
  2.1 제품 분석
  2.2 3차원 측정
 3. 결과 및 고찰
  3.1 Sub-frame 용접 지그 설계를 위한 기본 설계
  3.2 용접지그 설계 및 제작
  3.3 용접지그를 이용한 sub-frame 제작
  3.4 직각도 시험 및 측정
 4. 결론
 참고문헌

• 신형곤(전북대 기계시스템 공학부) | H. G. Shin