• 한국가구학회지
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• 제25권1호
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• pp.45-54
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• 2014

Wood cutting utilizing CNC art in the field of furniture design industry, art, education are diverse. However, there is lack of data in the case for wood cutting, such as cutting conditions and wood cutting. So this article is to establish furniture design processing using CNC. The researchers investigated the processed products using CNC, the data of the web site and CNC relevant articles, then organized its impact on the furniture industry today. History and definition of CNC have studied for a discussion of the advantages and disadvantages. Then, the researchers analyzed the cases to investigate the wood cutting conditions, was applied to the fabrication of furniture domestic and foreign. CNC organized systematically design information through the computer So, it allowed to reduce the repetitive behavior that has to work hand in the furniture manufacture existing. CNC has made it possible to design a fine complex in furniture design industry. So it became possible to make a new representation and production of various forms. Material about CNC are mostly for milling machine and shelves for metal processing. So, the researchers investigated and precautions general content of wood cutting. The enhanced understanding to investigate an example that is applied outside the country, is used to analyze the expression various techniques CNC. It is difficult to obtain accurate data processing, it has various characteristics in the same timber, Future research is about analyzing type applications and CNC machining range at the time of processing the various wood.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 춘계학술대회 논문집
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• pp.161-166
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• 2003

The micro-extruding die is a die for manufacturing of fine-wire by extruding process. The fine-wire made from the micro-extruding can be effectively applied to fields of semiconductor parts and medical parts etc. It is predicted that the demand of fine-wire in industry is more and more increasing. In this study $\phi50\mu m$ micro-drill which is coated with diamond is used for drilling of super micro-hole sizes. For the machining of taper parts of entrance and exit, drill having $\phi50\mu\textrm{mm}$ inclination angle $20^{\circ}$and angle $30^{\circ}$ is used. This is useful for anti tool-breakage and excessive too-wear in drilling process. After micro-drilling, the polishing process by diamond abrasive and polishing wood s carried out for increasing surface roughness.

• 한국가구학회지
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• 제25권1호
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• pp.28-35
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• 2014

The most widely used material in furniture is wood. It is not only because it has good machinability and can be easily accessed, but also it is eco-friendly and human-friendly. Such material has been continuously being used for furniture and its machining method has been being actively researched and developed. Lumber has and has developed its own machining method. The conventional lumber machining method is difficult to make various types of furniture because it focuses on solving lumber's own modification problem due to the swelling and shrinking, and durability. Considering such characteristic of the material, a method to make it light and durable has been being researched and possibilities were found in wooden ships. Wooden ships are ships made of lumber, and are light and strong to be used in water. Also, in order to reduce the water resistance, it has streamlined curves so is formatively beautiful. The elegant curves and light and strong structure showed sufficient possibility to be used in furniture. Thus, the purpose of this study is to find a method to make various shapes of lumber lightly and strongly, using the production method of wooden ships, and to use this production method in designing furniture to propose a new form and structure of bench design, differentiating from conventional monotypic furniture.

• 한국가구학회지
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• 제19권6호
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• pp.411-419
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• 2008

Xylia xylocarpa is fast-growing trees that are currently planted on trial basis in Sabah, Malaysia. The wood quality of trees grown in Sabah may differ from those grown in other places due to the environmental factors. Five 9-year-old trees of each species were extracted from their respective plots at Luasong, Tawau. Wood specimens were prepared from three height levels; bottom, middle and top, at the inner and outer radial positions. The within-tree and between-tree variations of physical properties of these species were analyzed. The basic density, oven-dry density and green moisture content(MC) are 0.72g/$cm^3$, 0.78g/$cm^3$ and 49.8% respectively. The shrinkage from green to oven-dry conditions for the radial and tangential directions were 3.35% and 5.76%, respectively. The trends of within-tree variations for most properties were more consistent in radial rather than vertical direction. This suggests diameter growth to be a more important factor contributing to the variations compared to height. Samples from the outer part of the stem were found to have higher density, shrinkage and mechanical strengths. The between-trees variations of some wood properties were found to be significantly different, probably due to genetic and micro-environmental factors. Significant correlation was recorded among the physical properties of the species. The true potential of X. xylocarpa for end-uses would be enhanced by further research such as the study on properties of wood from different sites and other properties like durability, seasoning, processing and machining characteristics. The characteristics of X. xylocarpa are comparable to a number of local popular hardwood species, indicating its suitability for heavy construction uses.

• 한국융합학회논문지
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• 제8권11호
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• pp.115-121
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• 2017

의료용 디지털 영상 및 통신 표준과 5축 가공기술의 융합적 연구를 통하여 맞춤형 인공관절의 기초적 지식을 얻고자 하였다. 연구방법으로 의료영상의 위팔뼈에 대해 3차원 모델링을 생성하고 케미컬우드 소재로 형상을 가공하여 해부학적 특징과 모델링 가공 연산시간을 비교하였다. 그 결과 스테레오리소그래피 모델링이 아이제스 모델링에 비해 중삭 2배, 정삭 10배 정도로 시간이 많이 소요되었다. 5축 가공된 위팔뼈는 해부목, 큰돌기, 작은돌기, 결절사이 고랑의 해부학적 구조가 3차원 의료영상과 동일한 특징으로 나타났다. 이와 같이 위팔뼈의 외과목 언더컷 등 다양한 형태의 구조가 5축으로 가공되는 융합적 가공 기술들은 인체의 정밀한 모형을 추구하는 맞춤형 관절 제작 시 향후 적용 가능성이 높음을 알 수 있었다.

• Journal of the Korean Wood Science and Technology
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• 제42권4호
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• pp.357-366
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• 2014

백합나무 판재를 벽판재로 이용하기 위해 백합나무의 생재와 건조재에 대한 휘발성유기화합물(VOCs)과 알데히드류 방출 특성을 검토하였다. VOCs 및 formaldehyde를 포함한 aldehyde류의 방출량 측정은 다중이용시설 등의 실내공기질 관리법에 공시된 20 ${\ell}$ Chamber법에 따라 실시하였다. 백합나무의 생재 및 건조재에서는 30여 가지 이상의 VOCs가 검출되었다. 백합나무의 Total VOC 구성 비율 가운데 천연VOC (NVOC)의 비율은 11.1%로 다른 침엽수종과 비교하여 낮게 나타났다. 백합나무의 aldehyde류 분석 결과, 심재 및 변재에서 같은 3종(acetaldehyde, ketone, propionaldehyde)이 검출되었으며, formaldehyde의 방출량은 $4.01{\mu}g/m^3$ 이하로 나타났다. m-Tolualdehyde의 경우 백합나무 건조재의 심재에서만 $33.6{\mu}g/m^3$의 방출량을 보였으며, 심재와 변재 모두 ketone의 방출량이 가장 높게 나타났다. 백합나무 특유의 역한 냄새는 acetaldehyde와 propionaldehyde와 기타 VOCs에 의한 것으로 추정된다. 건조한 백합나무에서는 휘발성이 강한 ketone의 방출량이 증가하였다.