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Production Process Development and Prototype Evaluation for Roller Tappet Housing of Valvetrain

밸브트레인용 롤러태핏 하우징의 제작 공정 개발 및 시제품 평가

  • Gwak, Eun-Jo (Department of Mechanical Engineering, Graduate School, Kongju National University) ;
  • Park, Sung-Young (Div. of Mechanical & Automotive Engineering, Kongju National University)
  • 곽은조 (공주대학교 대학원 기계공학과) ;
  • 박성영 (공주대학교 기계자동차공학부)
  • Received : 2016.08.09
  • Accepted : 2016.11.10
  • Published : 2016.11.30

Abstract

In this study, a cold forging process was developed for the roller tappet housing of an engine valvetrain system. A tappet sample was manufactured and subjected to an endurance test. The material properties were obtained from a compression test, and forging analysis was carried out to design a forging process using a commercial program, Deform-3D. The forging process was set up based on the analysis results, and a die set and sample tappet housing were manufactured. To evaluate the sample, the dimensional accuracy, surface roughness, parallelism, and concentricity were measured and confirmed. To evaluate the actuation and durability, a special test rig was developed to simulate the valvetrain system of the engine. An actuation test was performed based on the idle speed of a general diesel engine, and an endurance test was done based on the maximum speed. The results show minor wear of 0.002 mm. The developed test rig will be used to evaluate the actuation and durability of other valvetrain parts.

Keywords

Cold Forging;Forming Analysis;Tappet housing;Process Development;Prototype evaluation

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