• Title/Summary/Keyword: ironing

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A Development of an All-in-one Ironing System for All Style Pants (바지 형태에 구애받지 않는 융합 다림질 시스템 개발)

  • Kim, Keunsik;Kim, Jong-Hoon
    • Journal of Convergence for Information Technology
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    • v.12 no.1
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    • pp.172-179
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    • 2022
  • Unlike other processes such as washing, the ironing process in the laundry process is difficult to standardize and thus relies on manual labor. Unlike upper garments, pants have pleats at the waist as well as a crease line below the waist, Therefore, two separate ironing devices have been developed and used. However, in this method, problems such as additional worker input, space loss, and wrinkling of pants occur due to manual movement between processes, Consequently, a pants ironing device that combines the two equipments is required. The all-in-one pants ironing system described in this paper automatically sequentially irons the upper part and side of the pants regardless of the length, shape, and upper pleats of the pants. It also performs a self-diagnosis function while displaying the ironing progress on the user's monitor. As a result of this study, it became possible to double the amount of ironing and reduce power consumption by more than 20% compared to the case of using two independent equipment.

Effect of Ironing Temperature on the Removal of Poly Vinyl Alcohol Size (PVA 가호 직물의 다림질 온도가 탈호률에 미치는 영향)

  • 이정옥
    • Journal of the Korean Home Economics Association
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    • v.18 no.4
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    • pp.13-16
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    • 1980
  • In cotton fabric sizing the domestic material is normally starch finds itself more frequent uses than the PVA size does. In this study we have examined the effects of ironing temperature and washing temperature on the removal of sized PVA by washing and have got following temperature on the removal of sized PVA by washing and have got following results: 1. the removal of PVA is related approximately to the reciprodal of the ironing temperature. 2. the higher the ironing temperature, the lower is the removal of PVA; and if the ironing temperature is higher than $140^{\circ}C$ the removal of PVA decreases abruptly even if the washing temperature were still high. 3. The most appropriate washing temperature should be at least $75^{\circ}C$when the ironing is carried out at 10$0^{\circ}C$ the same holds for $80^{\circ}C$to $120^{\circ}C$and $90^{\circ}C$to $120^{\circ}C$, respectively.

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Combined Process of Ironing and Redrawing in Progressive Drawing (연속드로잉에서 아이어닝과 리드로잉의 복합공정)

  • Chung, Joon-Ki;Cho, Woong-Shick;Lee, Taek-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.5
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    • pp.654-661
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    • 2004
  • In deep drawing of sheet metal, there are many cases in which the uniform and thin wall thickness of the drawn products is more important than the bottom thickness. In this case, we can not easily get the deep drawn products with the uniform and precise wall thickness by only drawing process. Therefore in general the manufacturing processes which both the drawing and the ironing process are proceeded sequentially are used. But this method has the disadvantages of a cost-up, decrease of productivity and degradation of quality, because the ironing process is added after the drawing process. In this study, in order to improve those problems and to enhance the effect of deep drawing, the combined process of redrawing and ironing fur multistep drawing of cylindrical cups is used. In this experiment, we considered the characteristics of the combined process such as the relation between the drawing and ironing rates, the drawing limits and the forces needed for operations. The suggested force prediction shows that it can successfully represent experimental results.

Effects of surface characteristics of electrolytic tinplate on frictional properties during ironing operaration of 2-piece can-making process (전기주석도금강판의 표면특성이 투피스캔 제관공정의 아이어닝 가공시 마찰특성에 미치는 영향)

  • 김태엽
    • Journal of the Korean institute of surface engineering
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    • v.30 no.3
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    • pp.191-201
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    • 1997
  • Non-passivated electrolytic tinplates withour conventinal chemical treatment self-oxidize in ambient atmosphere to from yellow stain on the outermost surface during the long-term storage. The degree of yellowness of the stain increased linerly with the oxide thickness due to the interfeefence color of the $SnO_2$ Even though the thickness of the oxide layer was very thin, less than 100$\AA$ , it exerts an undesirable influence on the can-making processes, particularly the stripping behavior after ironing. Investigations were carried out on the morphologies of the coating layer, the changes in oxide thickness during successive can-making processes and the averge friction coefficients with the different oxide thinkness. These oxide layers were broken up and distributed within the bulk tin coating during the ironing process. This redistribution of the oxide layer prvented smooth pressing-aside of the tin coating layer, resulting in an increase in the ironing friction coefficient. As the friction was increased, the residual stress along the can wall thinkness(i.e., the hoop stress) was also increased. Due to both the oxibe layer accumulation, which increased the friction coefficient, and the hoop stress, can stripping efficiency without roll-back is reduced.

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Development of an Aluminum Liner using Multi-drawing and Ironing Processes based on the Ductile Fracture Criterion (연성파괴에 기반한 다단 디프드로잉 및 아이어닝 공정에 의한 알루미늄 라이너 개발)

  • Yun, Y.W.;Kang, S.H.;Yun, C.K.;Lee, J.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.10a
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    • pp.403-407
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    • 2009
  • In this work, finite element investigations were carried out to manufacture a seamless aluminum liner without crack generation using four-stage deep drawing followed by two-stage ironing process. In order to predict the crack generation during the liner manufacturing process, the Normalize Cockroft-Latham(NCL) which is one of ductile fracture criteria was adopted. In addition, the tensile tests were carried out to obtain the critical value of NCL by comparing the experimental and FE simulation results. From this, various case studies based on FE simulation were carried to obtain the optimum die designs which can prevent the crack generation during ironing processes. Finally, the aluminum liner was successfully made using obtained die designs so that requirements were met in terms of thickness and height of the liner.

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A Study on the Development of Computer-Aided Process Planning System for the Deep Drawing & Ironing of High Pressure Gas Cylinder (고압가스 용기를 위한 Deep Drawing & Ironing(D.D.I.) 공정설계 시스템 개발에 관한 연구)

  • Yoon, Ji-Hun;Jeong, Sung-Yuen;Choi, Young;Kim, Chul;Choi, Jae-Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.2
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    • pp.177-186
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    • 2002
  • This paper describes a research work on the development of computer-aided design system far the deep drawing & ironing of high pressure gas cylinder. An approach to the design system is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, handbook, experimental results and the empirical knowledge of field experts. This system has been written in AutoLISP on the AutoCAD Rl4.0 using personal computer. This system is composed of three modules which are input. process design and drawing.

A Study on the Forming Process Design of Cylindrical Multithickness Shell (다단 벽두께 원통 쉘 성형 공정 설계에 관한 연구)

  • 신보성;최두선;김동진;김병민;한규택;신영우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.943-948
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    • 1996
  • In this paper. we will discuss in making large size cylindrical shells with multithickness wall sections such as straight, stepped, tapered sides. These shells are constructed of type 6061 O temper aluminum starting with a blanking size of 877 mm plate. Its diameter to length ratio of 1 to 2.78 and a 36.7% wall reduction is achieved by our continuous deep drawing process. This process required no in-process annealing. But after cold working, these shells is performed heat treatment to T6 condition. These shells are used for the making of seamless LPG pressure vessels after the spinning process. This process is composed of deep drawing, reverse redrawing, drawing-ironing and several ironing processes. In the verification of forming process design, we used DEFORM code.

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Die design system for deep drawing and ironing of high pressure gas cylinder

  • Yoon Ji-Hun;Choi Young;Park Yoon-So
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.4
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    • pp.31-36
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    • 2005
  • This paper describes a research work on the die design for the deep drawing & ironing(D. D. I) of high pressure gas cylinder. D. D. I die set is large-sized die used in horizontal press, which is usually composed of a drawing, and an ironing die. Design method of D. D. I die set is very different from that of conventional cold forging die set. Outer diameter of the die set is fixed because of press specification and that of the insert should be as small as possible for saving material cost. In this study, D. D. I die set has been designed to consider those characteristics, and the feasibility of the designed die has been verified by FE-analysis. In addition, the automated system of die design has been developed in AutoCAD R14 by formulating the applied methods to the regular rules.

Experimental and Numerical Study of Cold Ironing as a Post-Process of Net-Shape Manufacture of Gears (기어 정밀정형 성형을 위한 후 공정으로서의 냉간 아이어닝 공정에 대한 연구)

  • Chang, Yu-Chul;Park, Chul-Sung;Kim, Byung-Min;T.A. Dean;Kang, Beom-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.10
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    • pp.2096-2103
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    • 2002
  • Cold ironing, as a post-forging operation of warm forged gears, needs a clear understanding of form errors due to die-elasticity and springback of component. In order to simplify the analysis of cold ironing, a single tooth instead of a whole gear component was investigated. The influence of initial surface roughness, die design, and die/workpiece interference has been examined experimentally and numerically. As a result the changes in geometrical profile, dimensions, and surface finish in a single tooth were observed. This study demonstrates that predicted dimensions can be achieved and surface finish also can be greatly improved.