알루미늄 판재의 드로-아이어닝 공정설계 조건변화에 따른 원통컵 성형성과 제품품질 비교

손현범(H. B. Son),김한솔(H. S. Kim),선윤경(Y. K. Seon),김종호(J. H. Kim) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8

This study is the test for comparing the formability and product quality according to the changes of experimental conditions of draw-ironing process of cylindrical cup. The progressive drawing and ironing processes are commonly used in industrial applications. However, a reduced number of steps is necessary for reducing the production cost. New forming process is introduced which performs the deep drawing and ironing process at the same time. The maximum drawing ratio was investigated by changing blank diameter, ironing rate and blank holding force for Al1050-O material. Also the quality of products was compared.

신라 전기양식토기의 성립

최병현(Choi, Byunghyun) 중부고고학회 2013 고고학 Vol.12 No.1

Early Silla style pottery, which followed Incipient Silla style pottery, was established in the Gyeongju region from around the mid-fourth century CE. The Early Silla style mounted cup emerged through the modification of Incipient Silla style mounted cups with cylindrical and trumpet-shaped pedestal foots, such as those from the Okjeon burial ground at Hapcheon. This modification consisted of the elongation of, and the addition of perforations to, the pedestal foot. The Early Silla style long-necked jar emerged through the elongation of the neck section of the Incipient Silla style globular jar, which had centrally placed raised bands. Phase 1, the phase in which Early Silla style pottery was established, can be divided into Phase lA (dating to the mid-fourth century) and Phase 1B (dating to the late fourth century). The former phase witnessed the co-existence of mounted cups with cylindrical and trumpet-shaped pedestal foots which had four tiers of perforations. In the latter phase, the mounted cup with cylindrical pedestal foot disappeared and only the mounted cup with trumpet-shaped pedestal foot which had three tiers of perforations came to be used, along with the mounted cup with a pedestal foot shaped like a flat topped cone and two tiers of perforations. During Phase lA in the Gyeongju region, mounted cups with flame-shaped perforations were used alongside mounted cups with cylindrical pedestal foots. Based on the evidence from the Hwasan-ri kiln site in Gyeongju, it is clear that these vessels were produced in the Gyeongju region. In Phase 1, the Early Silla style mounted cups demonstrate very rapid stylistic change, with two stylistic stages observable for Phase lA and three stylistic stages observable for Phase lB. On the other hand, the Early Silla style long-necked jars demonstrate very slow stylistic change, which no significant changes observable from Phase lAa to lBa. It is only afterwards that certain changes, such as the addition of pedestal foots and the adoption of straight necks, came to take place. 'This indicates that the different ceramic types of Early Silla style pottery experienced different speeds of stylistic change and different time periods of significant stylistic transformation. It is also possible to observe that, although the Early Silla style mounted cup and the Gaya style mounted cup both developed from a common prototype, difference in vessel form appeared in Phase lA In Phase lB, the distinctive regional ceramic styles of the area east of the Nakdong River (represented by alternating pedestal perforations) and the area west of the Nakdong River (represented by vertically aligned pedestal perforations) came to be respectively established. Cross-dating with the Sueki. vessels of the Japanese K.ofun Period which have been dated through dendrochronological research, as well as with the horse trappings from the northeast region of China and the middle and northern regions of the Korean Peninsula, was attempted in order to establish the dates for the formation of the Early Silla style pottery assemblage. It is noted that the notion that the southern campaign of King Gwanggaeto the Great in 400 CE led to the termination of the Daeseongdong burial ground in Gimhae and the migration of Geumgwan Gaya groups to the Japanese Archipelago, or the notion that the stirrups of Korea or Japan cannot be older than 415 CE based on the stirrups from the Feng Sufu (馮素弗) burial, or the notion that Hwangnam Great Tomb in Gyeongju is the resting place of King Nulji have come to be regarded by certain researchers as mere stereotypical views which only act to impede upon open academic thinking. It is argued that such stereotypical notions, which have not been based upon archaeological evidence but are merely historically recorded circumstances or over interpretations of such circumstances, act only as barriers in the construction of chronologies, based on actual archaeological evidence and archaeolog 신라 전기양식토기는 경주지역에서 신라 조기양식토기에 이어 서기 4세기 중엽에 성립되었다. 신라 전기양식토기 고배는 합천 옥전고분군에서 볼 수 있는 것과 같은 신라조기의 통형고배와 나팔각고배의 기형을 계승하면서 대각이 길어지고, 길어진 대각에 투창을 뚫으면서 성립되었다. 장경호는 신라조기의 짧은 경부 중간에 돌대가 있는 구형호들의 경부가 길어지면서 성립되었다. 신라 전기양식토기의 성립기, 즉 1기는 통형과 나팔형의 4단각 고배가 공존한 4세기 중엽의 1A기와, 통형고배가 시실상 소멸되고 나팔형 3단각 고배와 함께 새로 발생한 직선형 2단각 고배가 존재한 4세기 후엽의 1B기로 구분된다 1A기 경주에는 통형고배와 함께 화염형투창 고배도 존재하였는데, 경주 화산리 요지의 예로 보아 이들은 경주지역에서 생산된 것이 분명하다. 신라 전기양식토기 1기의 고배는 빠른 형식의 변화를 보여 1A기에 2소기 1B기에 3소기의 형식이 구분되는데 비해, 장경호는 그 변화가 느려 1Aa기부터 1Ba기까지는 큰 변화가 없었고, 그 뒤에야 경부의 직선화 대각의 채용 등 형식의 변화가 뒤따랐다. 이로 보아 신라 전기양식토기는 기종에 따라 변화 속도와 주 변화 시기가 달랐던 것을 알 수 있다. 그리고 신라 전기양식토기와 가야토기의 고배는 공동 조형에서 발전한 것이었으나 1A기부터 기형상의 차이를 보이다가 1B기부터는 교차투창 고배로 대표되는 낙동강 이동양식과 일렬투창 고배로 대표되는 이서양식으로 지역권이 완전히 분립되었다. 한편, 신라 전기양식토기 성립기의 연대는 연륜연대를 가진 일본 고분시대의 須惠器, 그리고 중국 동북지방을 비롯하여 한반도 중부 이북지방의 마구와 교차편년하여 설정하였다. 서기 400년 광개토대왕의 남정에 의한 김해 대성동고분군 축조중단과 금관가야 세력의 일본열도 이주설, 馮素弗墓 등자에 의한 한ㆍ일 등자의 415년 상한설, 경주 황남대총의 눌지왕릉설은 이제 일부 연구자들에게 자유로운 학문적 사고를 가로막는 고정관념이 되고 있다. 명확한 고고학적 자료나 근거에 의힌 것도 아니고 역사적 정황이나 이를 확대해석한 주장에 불과한 그와 같은 고정관념은 고고학자료와 고고학적 방법에 의한 동북아시아 고고학자료의 편년을 가로막는 장애물이 될 뿐이다.

Deep Drawing of Cylindrical Cups Using Polymer Powder Medium Based Flexible Forming

Can-Bin Zhang,Feng Gong 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1

A novel flexible forming process—polymer powder medium based flexible forming (PPFF)—was presented in this research. Cylindrical cups with inner diameter of 8 mm were formed using rigid mould deep drawing and PPFF process, respectively. The blank material was pure copper C1100 with a thickness of 0.4 mm which was annealed at 450oC for 1 h in vacuum condition. The deep drawing experiments were carried out at room temperature under dry friction condition. Ethylene-vinyl acetate copolymer (EVA), poly vinyl chloride (PVC) and ultra-high molecular weight polyethylene (UHWPE) were used. The influence of polymer powder type and weight on deep drawing force and limiting drawing ratio (LDR) were investigated. The results showed that the cylindrical cups were well formed by using PVC. The LDR reached 2.1 by using PVC, higher than rigid mould. The surface quality was also good, with the thinning rate much smaller than rigid mould forming.

정수기 냉온수 탱크 원통형 드로잉 제품의 재질 변화에 따른 두께 변화에 관한 연구

장은정,이춘규,Jang, Eun-Jeong,Lee, Chun-Kyu 한국금형공학회 2021 한국금형공학회지 Vol.15 No.3

In plate forming technology, cylindrical drawing process is widely used in industry due to technological development. In this study, we used stainless steel 3042B and stainless steel 304J1, which are the most commonly used materials in the production of cold and hot water tanks for water purifiers, among cylindrical drawing products. Under the same conditions, the thickness of the sidewall of the product formed by drawn experiment was studied. As a result of the experiment, the bottom thickness of stainless steel 304J1 was considered to be thick. It is judged that the defect rate can be reduced by changing the breaking phenomenon of the floor surface of the cold and hot water bottles to the material of stainless steel 304j1. Stainless steel 304 2B material shows a sharp change in thickness from punch corner R to sidewall position, while stainless steel 304J1 material showed a uniform change from punch corner R to sidewall position. Stainless steel 304J1 material is considered to improve the clamping of the product in the process of extracting the product after hand drawing. The appearance of stainless steel 3042B products is considered to produce more wrinkles in the flange, which exerts greater tensile force on the sidewall during molding, resulting in uneven sidewall thickness.

羅州新村里9號墳의 築造過程과 年代再考-羅州伏岩里3號墳과의 비교 검토-

오동선 한국고고학회 2009 한국고고학보 Vol.73 No.-

This paper aims to review the building process and dating of perpendicular extension tombs of the Yeongsan River Basin by comparing and examining Naju Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3. It was confirmed that the perpendicular extensions observed at both tombs took place over a relatively short period of time, forming an inclined plane around the top of each tomb. The cross-dating of artifacts (the flat cup with cover and jar coffin) from Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3 Tomb provided information on chronology. Flat cups with covers and jar coffins dating to earlier than the late fifth century AD could not be observed in the lower layer of Sinchon-ri Tomb No. 9, suggesting that its construction took place around the same time as Stone chamber 96 of Bokam-ri Tomb No. 3. Accordingly, it appears that the vertical extension of tombs was a building method prevalent in the Yeongsan River Basin for a very short period before and after the sixth century AD. Around the same time, Long Drum-shaped tombs were built in the middle and upper reaches of the Yeongsan River. Bokam-ri Tomb No. 3 and Sinchon-ri Tomb No. 9, situated in the middle reaches of the Yeongsan River, reflect the introduction of various cultural elements into the indigenous cultural context.

Macro-performance evaluation of friction stir welded automotive tailor-welded blank sheets: Part II - Formability

Kim, D.,Lee, W.,Kim, J.,Chung, K.H.,Kim, C.,Okamoto, K.,Wagoner, R.H.,Chung, K. Pergamon Press ; Elsevier Science Ltd 2010 International journal of solids and structures Vol.47 No.7

Formability of automotive friction stir welded TWB (tailor-welded blank) sheets was experimentally and numerically investigated in this work for four automotive sheets, aluminum alloy 6111-T4, 5083-H18, 5083-O and DP590 steel sheets, each having one or two different thicknesses. In particular, formability in three applications including the simple tension test with various weld line directions, hemisphere dome stretching and cylindrical cup drawing tests was evaluated. For numerical simulations, mechanical properties previously characterized in a joint paper (Chung et al., 2010) were utilized. To represent the mechanical properties, the non-quadratic orthogonal anisotropic yield function, Yld2000-2d, was utilized along with the (full) isotropic hardening law, while the anisotropy of the weld zone was ignored for simplicity.

딥 드로잉 공정에 미치는 영향인자에 관한 실험적 연구

이승훈,정동원 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1

Sheet metal forming process is a non-linearity problem which is affected by various process variables, such as geometric shape of punch and die, frictional characteristic, etc.. Therefore, the knowledge of the influence of the process variables is needed in the design of sheet metal working processes. In this paper, deep drawing tests for blank holding force, punch speed and lubrication between sheet material and tool were carried out to investigate the influence upon sheet formability. Experimental results were discussed about the defects on the deformation behaviors during the forming process.

알루미늄 판재의 다단계 드로잉에 있어서 원통컵의 치수 정밀도 비교

최종민(J. M. Choi),김종호(J. H. Kim) 한국소성·가공학회 2015 소성가공 : 한국소성가공학회지 Vol.24 No.2

딥드로잉공정에서의 재료 수율 향상에 관한 연구

하종호(Jong-Ho Ha),강형선(Hyung-Sun Kang),백호현(Ho-Hyun Baik) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회지 Vol.33 No.4