A Study on the Snap-fit Design System in Injection Molding

사출성형에 있어서 스냅핏 설계 시스템에 관한 연구

  • 강성남 (한국기술교육대학교 기계공학과 대학원) ;
  • 허용정 (한국기술교육대학교 메카트로닉스공학부)
  • Published : 2001.12.01


One of the major advantages of using engineering plastics is ease of part assembly through a locking mechanism known as a snap fit. The typical snap fit involves a short cantilever beam with a projection at the free end. which slides over a one way ramp on the mating part to lock in place. The tightness of the mechanism is determined by the lateral interference of the two sliding members If too small they become loose and can't hold together. while if too large. excessive force can be generated. causing failure of the cantilever beam during the assembly operation. Therefore. the accurate determination of the force-deflection relationship for cantilever beams is a key element in snap fit design. And also. the process of injection molding should be considered when cantilever beam is designed. But it is not easy for novice designers to design them appropriately because of the profound knowledge related to injection molding. In this paper. an intelligent design program has been developed and proposed to improve a conventional empirical design method.


Injection molding;Knowledge-based design;Supplementary feature;Snap fit