• 제목/요약/키워드: Metal industry

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DED방식의 적층가공을 통한 금형으로의 응용사례 및 효과 (Effects and Application Cases of Injection Molds by using DED type Additive Manufacturing Process)

  • 김우성;홍명표;김양곤;서창희;이종원;이성희;성지현
    • Journal of Welding and Joining
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    • 제32권4호
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    • pp.10-14
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    • 2014
  • Laser aided Direct Metal Tooling(DMT) process is a kind of Additive Manufacturing processes (or 3D-Printing processes), which is developed for using various commercial steel powders such as P20, P21, SUS420, H13, D2 and other non-ferrous metal powders, aluminum alloys, titanium alloys, copper alloys and so on. The DMT process is a versatile process which can be applied to various fields like the mold industry, the medical industry, and the defense industry. Among of them, the application of DMT process to the mold industry is one of the most attractive and practical applications since the conformal cooling channel core of injection molds can be fabricated at the slightly expensive cost by using the hybrid fabrication method of DMT technology compared to the part fabricated with the machining technology. The main objectives of this study are to provide various characteristics of the parts made by DMT process compared to the same parts machined from bulk materials and prove the performance of the injection mold equipped with the conformal cooling channel core which is fabricated by the hybrid method of DMT process.

금속박판과 프로젝션 용접을 이용한 쾌속 조형법의 개발 (Development of Rapid Prototyping Technique using Sheet Metal and Projection Welding)

  • 이상찬;최진호
    • Journal of Welding and Joining
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    • 제22권2호
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    • pp.46-50
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    • 2004
  • In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs fur the product development. Since first emerged in 1986, Rapid Prototyping (RP) technology has helped successfully to reduce time and costs. Recently, RP using functional materials such as metal has been researched. However RP using the molten metal has been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish, post finishing, etc., that originate primarily from the overall deposition of molten metal for each layer. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. Also tensile and bending specimens were made by the developed RP process using projection welding and were verified.

꼭두서니에 의한 면직물의 염색시 매염제와 키토산 처리가 색상에 미치는 영향 (Effect of Mordant Concentration and Chitosan Treatment on Dyeing Property)

  • 최정임;전동원
    • 한국의류산업학회지
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    • 제5권3호
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    • pp.283-288
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    • 2003
  • Large quantity of metal mordant in natural dyeing has been used. For environmental reason, there is a need to reduce the amount of metal mordant and suggest the optimum amount of metal mordant in dyeing process. In this study, the relationship between mordant concentration and dyeing property was investigated. Various metal mordant concentrations of AI, Cu, Fe, Sn, were studied (from 1 to 5%). After treatment of mordant on cotton fabric, the concentration of metal ion in used mordant solution was quantified. There was no significant difference of the tone of color in mordant concentration from 1% to 5%, Therefore, there is no need to increase mordant concentration over 1%. chitosan treated cotton fabric showed a significant increase in dyeing affinity compared to untreated cotton fabric (the value of ${\Delta}E$ was 20). chitosan increased dye affinity significantly in the presence of mordant. It can be suggested that chitosan itself can replace metal mordants in the future.

한우액상분뇨로부터 중금속 저감을 위한 화학제재의 이용에 관한 연구 (A Study on Decreasing Metals from Hanwoo Slurry with Chemical Additives)

  • 김창만;최정훈;고수현;최인학
    • 한국환경과학회지
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    • 제19권11호
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    • pp.1385-1390
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    • 2010
  • Repeated additions of untreated slurry to soil affected ecology and caused high levels of heavy metal in soil and ground water. The objective of this study was to evaluate heavy metal from hanwoo slurry with ferrous sulfate ($FeSO_4{\cdot}7H_2O$), aluminum sulfate [$Al_2(SO_4)_3{\cdot}14H_2O$, alum] and aluminum chloride ($AlCl_3{\cdot}6H_2O$) as a way to improve environmental management in hanwoo industry. The treatment rates, which were incorporated totally within the hanwoo slurry, were 1.0 g and 1.5 g of ferrous sulfate, alum and aluminum chloride/25 g of hanwoo slurry. The various rates of chemical additives significantly increased dry matter (9.98~13.94%) and decreased pH (3.48~6.52) compared with the controls. The use of chemical additives decreased Fe (11~29%), Al (7~12%), Zn (13~36%), and Cu (4~32%) contents, except for Fe in hanwoo slurry with ferrous sulfate and Al in hanwoo slurry with alum and aluminum chloride. In addition, the reduction in heavy metal should be associated with reduction in pH. In conclusion, the results of this study suggest that alum and aluminum chloride additives at rate of 1.5 g were cost-effective management practice that significantly reduces heavy metal from hanwoo slurry, while it may be improved environmental management.

친환경 골판지 상자 제조를 위한 재활용 폐지 섬유의 물리적·환경적 특성 평가 (Fiber Analysis and Environmental Assessment of Recycled Waste paper for Eco-friendly Corrugated Box Manufacture)

  • 박정윤;이태주;김형진;김진무
    • 펄프종이기술
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    • 제45권4호
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    • pp.65-74
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    • 2013
  • In the manufacture of corrugated box, the fibrous raw materials are mainly consisted of recycled papers, such as KOCC(Korean Old Corrugated Container), kraft sack, and AOCC(American Old Corrugated Container). Among these recycled waste paper, the proportion of KOCC is relatively higher than others in fibrous raw materials. Generally, KOCC shows some poor fiber properties and contains hazardous heavy metal sources. Therefore, it is to evaluate the property of recycled paper sources for eco-friendly corrugated box manufacture. In this study, the physical and mechanical properties of 3 kinds of recycled fibers and their mixed stocks were analyzed. The environmental assessment was also evaluated by analyzing the 4 representative heavy metal contents and evaporation residues in waste papers. As the results, KOCC showed the poorest fiber qualities and had the highest heavy metal contents and evaporation residues among the recycled fibers. Finally, the mechanical strength properties were increased by decreasing KOCC proportion of mixed stock conditions. In addition, the heavy metal contents and evaporation residues were also decreased by increasing recycled AOCC and kraft sack proportion.

우리나라도금공업의 육성에 관한 연구(I) (A Study on Promotion of Metal-Plating Industry in Korea(I))

  • 라규일
    • 한국표면공학회지
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    • 제15권1호
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    • pp.24-38
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    • 1982
  • The Objective of this study is to analyze structural and operational aspects of the govern-ment, its associations, industries and academic associations related to metal-plating industry, and thereby recommend ways of promotion of subsector, which is yet to be developed. Stages for the implementation are proposed as follows. 1) Stage One: Preparation for formation of proper atmosphere. ⅰ) Clearance of unlicenced metal-plating factories. ⅱ) Strengthening of functions of the association. ⅲ) Provision of incentives through the tax system. 2) Stage-Two : Modernization and maturity ⅰ) Introduction of system for indicating quality of products. ⅱ) Implementation of joint and cooperative-based programs ⅲ) Technical advancement of the closed system and anti-pollution treatment. 3) Stage Three : Settlement ⅰ) Systematic use of statistics and information. ⅱ) Standardization of quality of the products.

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금속가공유 취급 업종에서 우점하는 세균 및 진균의 정성평가 (Identification of Predominant Bacteria and Fungi in the Industry Treating Soluble Metal Working Fluids)

  • 박해동;박동진;박현희
    • 한국산업보건학회지
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    • 제24권4호
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    • pp.416-424
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    • 2014
  • Objectives: The objective of this study is to analyze the predominant microorganisms in the industry treating MWFs(Metal working fluids). Methods: The bacteria and fungi were collected by agar plate impaction and bulk MWFs in storage tank at 54 sites in 9 shops in South Korea. The dominant bacteria and fungi isolated from agar media were identified by fatty acid analysis and morphological analysis, respectively. Results: Totally 111 dominant bacteria were identified in the process, outdoor, and bulk MWFs. The predominant bacterial genus was Micrococcus and Bacillus in the process and outdoor, Pseudomonas in bulk MWF. Among the identified 119 strains of fungi, Cladosporium and Penicillium genus were dominated. The ratios of bacteria designated biosafety level 2 and 1 were 30% and 21%, respectively. Conclusions: This study has investigated the dominant microorganisms in soluble MWF using industry. And it was useful that the qualitative evaluation method along with quantitative analysis for better understanding of the biological factors in the work environment.