Forged part made of Cold heading quality wire materials are used for automotive brake systems. The cost reduction of forged products is a major issue because of the strict shape change. A series of studies were conducted to minimize the cost of EPB spindle process among brake parts. In order to reduce the material cost, heat treatment-abbreviated material was applied and the formability on the processes was verified by the ductile fracture theory. In addition, the causes of shape fixation and die life degradation were analyzed using the numerical simulation. The process cost has been minimized by re-designing process, changing the product shape, and the die material.

ABSTRACT
1. 서 론
2. EPB Spindle
3. 저원가 소재 검토
    3.1 SCM435 vs. SAE10B35
    3.2 연성파괴기준 도출
    3.3 냉간단조 성형성 평가
4. 다단냉간단조 공정 최적화
    4.1 헤드부 성형공정 개선
    4.2 토글부 성형공정 개선
5. 결 론
References

• 서영호(Korea Institute of Industrial Technology, Senior Researcher) | Young-Ho Seo Corresponding Author