To improve life time of machine components, higher alloy grade materials are used by adding more metal alloy components and content. Also production processes are further complicated and subdivided such as the forging, preliminary heat treatment, quality heat treatment, rough machining and finished machining process. Those reasons become major cause of large stress in the materials, and the residual stress generated during the manufacturing process causes fatal defects, such as crack, surface tear, warping and deformation of the products. It is necessary to evaluate the residual stress on the entire processes, from forging process to final finished machining process. Also in order to avoid those problems caused by residual stresses, it is necessary to know in advance what process is important to be controlled and what parameters affect residual stress. By the hole drilling method, residual stress was measured in each manufacturing process step. In this study, the hardness of the surface, the cutting force test and the metal analysis were performed to clarify the influence of manufacturing process parameters.

ABSTRACT
 1. 서 론
 2. 실험 장치 및 방법
  2.1 시험편
  2.2 실험 장치
 3. 실험 결과 및 고찰
  3.1 공정별 잔류응력
  3.2 절삭력과 잔류응력 상관관계
  3.3 금속 조직의 잔류 응력 영향성
 4. 결 론
 References

• 황성국(Chonbuk National Unversity) | Sung-Kug Hwang Corresponding Author
• 문정수(Chonbuk National University) | Jeong-Su Moon
• 김한주(Chonbuk National University) | Han-Joo Kim