냉간단조 스퍼어기어의 치수정밀도

Dimensional Accuracies of Cold-Forged Spur Gears

  • 이정환 (한국기계연구원 재료공정연구부) ;
  • 이영선 (한국기계연구원 재료공정연구부) ;
  • 박종진 (홍익대학교 기계공학과)
  • 발행 : 1996.06.01

초록

Recently it is attempted to manufacture gears by various cold forging methods to meet requirements of mass production and uniform qualities. Compared to machined gears cold forged ears reveal higher tooth strength and better surface roughness but they reveal lower geometrical accuracies. Therefore in the present study a series of experiments are performed to investigate relations between geometrical accuracies of dies and billet and those of the final product. The geometrical accuracies of forged gears are considered through functional gear-element tolerances by measuring pitch error profile error lead error radial error tooth thickness and rolling test. Results of the experiments can be summarized as follows: (1) involute spur gears of KS 5(or AGMA7) accuracies can be made,(2) concentricity of die set should be maintained within 0.01mm (3) clearance between the billet and die set should be less than 0.1mm (4) con-centricity and radial runout should be less than 0.08mm and 0.1mm respectively. However it is thought that FEM analysis of elastic/thermal deformations of dies and the billet is necessary for a better understanding of the findings obtained through the present study.

키워드

참고문헌

  1. 大阪府立工業奬根館報告 no.44 Forming of Pump Gears by Cold Extrusion Ryoichi Wadabayashi;Fukuo Fujimoto;Hirokazu Yamamoto
  2. Dearborn, MI, Patent No. 3, 910, 091 Apparatus and Method for Cold Extrusion of Gears Shima K. Samanta;Assignee
  3. Gear Handbook Darle W. Dudley
  4. Inpact Machining Version Allsteel Press Company
  5. Ind. Anz. v.17 no.14 File β Pressen von Werkstuecken mit Komplexer Geometrie W. Koenig;H. W. Hafmann;K. Steffens
  6. Trans. of NAMRI/SME v.xxi Analysis of Tooth Profile Accuracy in Precision Forged Spur Gears with Involute Teeth M. H. Sadeghi;T. A. Dean
  7. 과학기술처보고서, UCN 184-536. C 냉간단조 기어의 정도향상에 관한 연구 유재운;김현기;이정환