• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.241-244
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• 2001

스냅핏은 일종의 결속장치로서 흔히 플라스틱 부품들을 서로 체결하는데 이용되는데, 다른 결속장치에 비해 간편하고 생산품의 조립단가를 줄일 수 있고, 또한 분리력은 큰 반면에 결합력은 작게 만들 수 있는 장점을 가지고 있어 널리 사용된다. 스냅핏의 설계는 재료에 따른 물성(property) 및 구조적 강성(stiffness)이 설계 초기단계에서 고려되어야 하고, 또한 사출성형공정에서 스냅핏의 성형성도 예측되어야 한다. 그러나 스냅핏의 형상, 치수, 위치 등을 적절히 설계합성(synthesis)하고 적절한 재료를 선택하는 작업은 공정에 관한 종합적인 지식을 지원해 주는 합리적인 설계도구가 제공되지 못했던 이유로 사출 전문가의 오랜 기간 축적된 경험과 지식에만 전적으로 의존하여 왔다. 본 연구에서는 기존의 전문가에 의존해온 스냅핏 설계방법을 개선하기 위해 사출성형에 의해 제한되어지는 지식을 규칙베이스화하고 재료의 물성과 스냅핏의 형상 및 치수에 파라 스냅핏이 갖는 결합력, 분리력, 변형하중 및 허용언더컷 등을 출력하는 지적 설계 프로그램을 제안하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.1-5
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• 2001

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.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.158-161
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• 2010

고중량, 부식 등의 문제를 안고 있는 목재/강재 리그매트를 대체할 수 있는 고강도 경량 고내구성 특성을 갖는 복합소재 리그매트를 전통 목재 연결방식의 결구시스템을 응용한 새로운 개념의 스냅핏 방식으로 개발하였다. 본 논문에서는 기존에 개발한 리그매트와 이를 개선한 개선형 리그매트의 스냅핏(snap-fit) 연결부의 안전성을 검증하기 위해 연결부 착탈 거동에 대한 해석 및 구조성능 시험을 실시하였고, 그 결과를 비교 분석하여 스냅핏 연결부의 긍정적인 효과를 입증하였다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2006.04a
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• pp.719-724
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• 2006

Owing to its special features of light weight, high durability, corrosion-resistant, composite material used in civil infrastructure can not only solve fundamental problems of deterioration and corrosion, but also reduce both construction and maintenance cost significantly. Composite deck panels of 스냅핏 type connection previously designed and fabricated have been redesigned herein. The sensitivity of gaps between snap-fits and tip angles was investigated. Stacking sequence of plies was scrutinized in order to facilitate pultrusion process. Deck panels of redesigned configuration due to bending has been analyzed. A comparison between the preliminary and modified deck design has been made.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.6
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• pp.121-126
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• 2006

Snap-fit is being used in manufacture of plastic products. Integral features using snap-fit are classified as locks, locators and enhancements. Locking features complete the process of attachment by providing physical interference to prevent separation. Looking feature pairs consist of two components, i.e., a flexible latch and a rigid catch and require particular care and attention for their selection. We can make several locking feature pairs by selecting latch and catch, but some parts restrict freedom of selection. Therefore, part designers must know the characteristic properties of generic locking feature forms as considering a specific design problem. In this paper, it has been presented about problem of small size products using locking feature and then introduced new locking feature applicable to small parts.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.378-385
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• 2017

This study investigated the design of a snap fit, which is widely used for fastening plastic parts. We analyzed the assembly mechanism of a lock snapfit, measured the assembly force and separation force based on the design of experiments, and derived a regression equation through an analysis of variance. The response surface methodology was also used. Polybutylene terephthalate was used to fabricate specimens, and the assembly force and separation force were measured using a micro-tensile tester. The length, width, thickness, and interference were considered as factors. A second-order regression model was used to derive the regression equation. The assembly force decreased with increasing length and width, but it increased with increasing thickness and interference. The finite element method was used to analyze the assembly mechanics. The width decreased the assembly force by increasing the ductility. The influences of the factors for low assembly force and high release force were shown to be opposite to each other. It was necessary to design a structure that minimized the assembly force while maintaining an appropriate level of separation force.

• The magazine of the Korean Society for Advanced Composite Structures
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• v.5 no.3
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• pp.26-37
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• 2014

• Journal of the Korean Society for Precision Engineering
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• v.18 no.8
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• pp.164-173
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• 2001

The configuration of injection molded part can be classified into primary feature and supplementary feature. Even though supplementary features such as ribs, snap fits and bosses make mold more complicated, which cause the increasement of the mold cost, supplementary features should be attached to primary features because of assembly, reinforcement, moldability and other functional purposes. But it is not easy for novice designers to design them appropriately because of the profound knowledge related to Injection molding. In this paper, the intelligent design tool called ISFD(Intelligent Supplementary Feature Designer) which supplies easy, simple, time and cost-effective design method has been studied and developed. A knowledge-based design system is a new tool which enables the concurrent design and CIM with integrated and balanced design decisions at the initial design stage of injection molding.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.1289-1295
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• 2003

Most industrial products nowadays have been manufactured by being made up of many parts what these are made from various kinds of materials. These parts and goods should be disassembled simply and classified easily by material or kinds of parts for the recycling. But it is not so easy to know how to take disassembly ways and those orders must be known and also analyzed the assembled points and directions of the every part. This research presents an design process for recycling that it will be considering whole design process for recycling about easiness of disassembling units as the prior condition to reuse the parts and used material, and to reduce waste parts.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.6
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• pp.44-49
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• 2006

The use of snap-fit features is highly recommended to reduce overall product cost and manufacturing time by reducing the number of parts and eliminating assembly with conventional fasteners. Application to particular product for integral attachment using snap-fit features is needed. Alternative attachment concept for specific application has been introduced. In this study, the optimal attachment design based on the given design objectives is identified using newly developed alternative attachment concept for the specific application to LCD monitor case assembly. Integral attachment using snap-fit features applies the systematic procedure and the intensity analysis.