자동서랍함용 완충기 튜브의 품질 안정성 예측

국문 초록 (Abstract)

자동서랍함용 완충기는 서랍을 여닫을 때 충격을 흡수하고 속도를 조절하는 역할을 해 준다. 완충기 튜브는 완충기의 구성품을 에워 쌓고 있는 원통 모양의 케이스이며 아세탈 재질로 되어있다. 본 연구는 사출 성형 공정에서 제작된 완충기 튜브의 품질 안정성을 평가하는 데 목적이 있다. 완충기 튜브는 4 캐비티 냉각장치를 갖춘 사출 성형 공정에서 제작된다. 본 연구에서는 완충기 튜브의 품질 안정을 판단하기 위해 분석과 시험이 수행되었다. 분석과 시 험은 컴퓨터 시뮬레이션을 통한 품질 분석과 연구된 튜브에 대한 외산품과의 성능 비교 시험이다. 사출 압력은 87.6 MPa로, 전체 휨량은 0.07~1.0 ㎜로 계산하였다. 연구된 튜브와 외산품을 비교해 볼 때 튜브의 최대 압축-하중은 231 kgf, 구간별 변위-하중은 0.05 kgf, 그리고 또 튜브 내경의 표면거칠기(Ra)는 0.02 ㎛ 향상되었다. 결과적으로 사출 성 형 공정에서 제작되어지는 연구된 튜브의 품질은 안정되었고 성능이 우수함을 알 수 있었다.

다국어 초록 (Multilingual Abstract)

The automatic drawer is used to absorb the movement shock and adjust its velocity when it opens and closes. The tube in shock-absorber is the cylindrical case which surrounds its parts and is made of acetal. The purpose of this study is to determine the quality stability of the tube in the shock-absorber in injection molding process. The tube which had been manufactured in the process with 4 cavity cooling unit was used. In this study, the analysis and test are carried out to determine its quality stability. Which are the quality analysis with numerical simulation and performance tests of the tube compared with one of foreign make. It is calculated that the injection press is 87.6 MPa and the deflections in X, Y, Z directions are ranged in 0.07~1.00 ㎜. When the researched tube is compared with the foreign made tube, the maximum bending compressive load is 231 kgf higher, average axial compressive load is 0.05 kgf higher, and the roughness(Ra) on the inner surface is 0.02 ㎛. lower. In the result, it is known that the quality of researched tube in injection mold process is stable and its performance is superior.

참고문헌 (Reference)

• 1 Malloy, R.A, "Plastic Part Design for injection Molding: An Introduction" Hanser / Gardner Publishers, Inc 75-84, 1994
• 2 Lam, Y.C, "Optimzing flow in plastic injection molding" 72 : 333-341, 1997
• 3 Lee, B.H, "Optimization of part wall thickness to reduce warpage of injection-molded parts based on the modified complex method" 34 (34): 793-811, 1995
• 4 Choi, W.J., "Optimization of Processing Conditions in Injection Molding Using Genetic Algorithm" 24 (24): 2543-2551, 2000
• 5 T. Kwon, "Moldflow Design Guide" MunUnDang 121-151, 2001
• 6 Erzurumlu, T, "Minimization of warpage and sink index in injection-molded thermo plastic parts using Taguchi optimization method" 27 : 853-861, 2006
• 7 Shen, C.Y, "Gate Location Optimization in Injection Molding By Using Modified Hill-Climbing Algorithm" 43 (43): 649-659, 2004
• 8 Park, J.C, "Automated Molding Design Methodology to Optimize Multiple Defects in Injection Molded Parts" 1 (1): 133-145, 2000
• 9 Jacques, M.S, "An Analysis of Thermal Warpage in Injection Molded Flat parts Due to Unbalanced Cooling" 22 (22): 241-247, 1982
• 10 Min, B.H, "A study on quality monitoring of injection-molded parts" 136 : 1-6, 2003