The cylindrical gear in power window motor assembly is important to doors of automobile. This study is performed for purpose of getting a manufacturing technique instead of large quantities import and small cavity mold production.
This multi-cavity cylindrical gear is produced under five procedures. The first, mold design of massproduction, the second, making a CAE model for mass-production, the third, manufacturing of sample mold, the fourth, trying-out and measuring of 3 dimensional design, the fifth, acquisition of data analysis and mold modification. Among them, analysis of mass-production using CAE, design and manufacturing of multi-cavity are successfully performed.
In the results, it is concluded that mold for one gate and six cavity based on hot-runner is suitable for making a cylindrical gear.

Abstract
 1. 서 론
 2. 원통형 기어의 성형재료의 특성
 3. 원통형 기어에 핫런너 및 다수 캐비티 적용
  3.1 핫런너 및 다수 캐비티 적용의 필요성
  3.2 핫런너 및 다수 캐비티 적용 관련 국내외 관련기술 현황
  3.3 핫런너 및 다수 캐비티 적용을 통한 파급효과및 활용방안
 4. 원통형 기어의 사출성형과 핫런너의 적용타당성
  4.1 실린더 형 기어의 사출성형
 5. 원통형 기어 제작을 위한 고찰
 6. 결 론
 참 고 문 헌

• 이정익(용인송담대 자동차기계공학부 교수) | J. I. LEE