• Title/Summary/Keyword: jacket manufacturing

Search Result 55, Processing Time 0.024 seconds

A Study on High Thermal Stable Separator Coating Machine for High-Capacity Lithium Ion Secondary Battery (고용량 리튬이온이차전지용 고내열성 분리막 코팅장비 연구)

  • Noh, Jin-Hee;Son, Hwa-Jin;Lee, Ho-Chul;Park, Jung-Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.18 no.12
    • /
    • pp.45-51
    • /
    • 2019
  • As the separator becomes thinner, the role of thermal stability becomes more important in ensuring the high capacity of medium- and large-sized lithium-ion secondary batteries. In this study, we researched coating technology to improve the separator's thermal stability. We minimized the coating time by optimizing the design of a vertical two-stage coater that was thin, uniform, and capable of coating on both sides at the same time with a maximum 2㎛ thickness coating layer of fluorinated polymer (PVdF-HFP) on the bare polyethylene (PE) separator, which increased the thermal stability. In addition, during the coating process, a dual-jacket-roll method of drying was developed that increased the drying effectiveness without thermal damage to the separator. We also investigated the thermal stability of the separator manufactured from a coating machine, and studied the battery-applied performance by making a lithium-ion pouch battery.

Study on the Cooling Effect of Motor Integrated Spindle (모터내장형 주축의 냉각특성에 관한 연구)

  • Song, Young-Chan;Lee, Deug-Woo;Choi, Dae-Bong;Kim, Soo-Tae
    • Tribology and Lubricants
    • /
    • v.13 no.1
    • /
    • pp.8-13
    • /
    • 1997
  • Generally, A motor integrated spindle is selected to perform the high speed machining, to improve the machining flexibility, and to simplify the structure of machine tools. The thermal deformation caused by heat generation of the integrated motor is, however, serious problem in motor integrated spindle system. In this study, cooling characteristics for the several kinds of cooling systems(such as, oil-jacket cooling, air cooling) are investigated and more efficient cooling method is presented. The results show that the shaft cooling by the air cooling system is effective to improve the thermal characteristic of motor integrated spindle.

A Comparative Study on the Sewing Teaching of Tailored Jacket (테일러드 재킷 봉제방법 비교 연구 - 의복구성 교재를 중심으로 -)

  • Shin, Jang-Hee;Sohn, Hee-Soon
    • Journal of the Korea Fashion and Costume Design Association
    • /
    • v.11 no.2
    • /
    • pp.75-84
    • /
    • 2009
  • The following research analyzed the sewing teaching of the tailored jacket shown in fashion textbooks, which are currently used in universities and educational organizations in the fashion industry. To analyze the sewing teaching of tailored jackets, we analyzed 35 textbooks in the market. Among them we used 14 textbooks which dealt with the patter formation method of tailored jackets, and cutting and sewing methods. First, the stitching direction and the location of attachment varied. The type of sticking tape and its position also differed, emphasizing the need to make an institutionalized education material which is based on the characteristic of the fabric and its silhouette. Second, controlling the ease length of the right side sewing princess line, or information about the shoulder line and sleeve line of the notch as not specifically shown in the textbooks. Furthermore, not many textbooks showed how to pull the lower part of the texture out of sight, nor did they explain why this needed to be done. Third, the lining is usually slightly larger than the outer texture of the clothing, as the lining is usually tugged in the sewing process, and this method makes the clothes more comfortable. The method of sewing the princessline $0.2{\sim}0.3cm$ outside the outer pattern was the most recommended. The center-back side was usually 2cm in activity measurements, but it turned out that a textbook which required ease treatment on the shoulder line did not do so on the lining material. The textbooks used in this research dealt only with how to manufacture a tailored jacket without full explanation about textures which could influence the manufacturing. The production method and process differed between different textbooks, showing the need to make a institutionalized education material. In a quickly-changing era where there is rapid change in the dressmaking procedure, we need to help students understand the process more easily through a formalized education process.

  • PDF

A Study on the Frequency Characteristics of Tubular and Jacket Type Tower for Offshore Wind Turbine Tower (해상 풍력 발전용 Tubular와 Jacket Type Tower의 진동 특성에 관한 연구)

  • Lee, Kang-Su;Lee, Jung-Tak;Son, Choong-Yul;Kim, Keon-Hoon
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.20 no.5
    • /
    • pp.615-621
    • /
    • 2007
  • Wind power generation is one of the promising gateways that will solve the energy crisis in the future. The wind power generator studied so far is limited to static interpretation in the areas related to tower. This study broadly sets the form of tower as tubular and jacket, identifies the characteristics of each and aims to find and apply their trend to in actual design and manufacturing process. This paper identified the resonance frequency of tower at each mode and studied their features. Furthermore, this study identified the characteristics of the load that occurs in operation and the effect of additional mass incurring when installed in sea, and it compared the two types of tower and was able to predict their trend.

The Static and Dynamic Analysis of a 45,000rpm Spindle for a Machine Tool and Evaluation of Its Stiffness (공작기계용 45,000rpm 주축의 정.동적 해석과 강성평가)

  • Kim, Dong-Hyeon;Lee, Choon-Man
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.28 no.4
    • /
    • pp.422-426
    • /
    • 2011
  • The spindle system is very important unit for the product accuracy in machine tools. A spindle system is designed by using the angular contact ceramic ball bearings, built-in motor, oil-air lubrication method and oil jacket cooling method. The static and dynamic analysis and stiffness evaluation of 45,000rpm spindle for machine tool has been investigated. Using a finite element method, we obtained some analyzed a static and dynamic characteristics of a spindle, such as natural frequency, harmonic analysis and we got the value of compliance through it. We evaluated stiffness by taking the inverse this value. A 45,000rpm spindle is successfully developed using the results.

Temperature Analysis for Optimizing the Configuration of the Linear Cell

  • Choi Jong-Wook;Kim Sung-Cho;Kim Jeong-Soo
    • Journal of Mechanical Science and Technology
    • /
    • v.20 no.7
    • /
    • pp.1089-1097
    • /
    • 2006
  • The market demand of display devices is drastically increasing in the information technology age. The research on OLED (Organic Light Emitting Diodes) display with the luminescence in itself is being more paid attention than LCD (Liquid Crystal display) with the light source from the back. The vapor deposition process is most essential in manufacturing OLED display. The temperature distribution of the linear cell in this process is closely related to securing the uniformity of organic materials on the substrate. This work analyzed the temperature distribution depending on the intervals between the crucible and the heating band as well as on the amount of the heat flux from the heating band. Moreover, the roles of the water jacket and the configuration of the cover within the linear cell were examined through the temperature analysis for six configurations of the linear cell. Under the above temperature analysis, the variations in the intervals and the amount of the heat flux were considered to have an effect on building the uniform temperature distribution within the crucible. It is predicted that the water jacket and the adequate configuration of the cover will prevent the blowout and clogging phenomena, respectively. The results can be used as the fundamental data for designing the optimal linear cell.

A Study on Marking Process in Apparel Production (의복 생산시 마킹(Marking) 공정에 관한 연구)

  • Kil-soon Park;Sin-A Ryu
    • The Research Journal of the Costume Culture
    • /
    • v.8 no.1
    • /
    • pp.53-64
    • /
    • 2000
  • The purpose of this study is to help efficient use of marking system and more competitive products manufacture through the actual investigation into manufacturing process of apparel products. For lack of the previous study on marking, fundamental survey was performed on systematic research for pattern marking in ready-made production line Data were collected from 36 companies using Apparel CAD/CAM through questionnaire and interview. The data were analyzed by using Frequency and Crosstabs utilizing SPSS. The results were as follows : 1. Marking situation in clothing companies were examined ; 24 companies(66.7%) use computer marking, and 12 companies(33.3%) have both computer marking and hand marking. Besides only 9 companies out of 36(25.0%) have CAM in cutting process. 2. The efficiency in marking methods was also studied and the expense-saved ways were presented. we have found there is no difference in a way of the textural efficiency but the working methods of hand marking and computer marking. 3. Merits and demerits in marking methods were investigated. In case of marking two men's wear (Jacket and Pants), it takes 38 minutes by hand whereas it takes 15 minutes by computer ; for two women's wear (Jacket and Skirt) 49 minutes by hand, and 16 minutes by computer. 4. Most of the markers have less than 5 years experiences and among them most women are less experienced. They are in the mid-twenties after college graduations.

  • PDF

Heat Generation Characteristics of Whirling Spindle for Ball Screw Machining (볼스크류 가공용 선회형 스핀들의 발열 특성에 관한 연구)

  • Moon, Hong-Man;Kim, Sang-Won;Jeong, Ho-In;Lee, Choon-Man
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.19 no.10
    • /
    • pp.44-51
    • /
    • 2020
  • We studied the heating characteristics of a whirling spindle. This spindle is an important component of a whirling machine for turning a ball screw shaft. In the manufacturing process for a conventional ball screw shaft, a single tool is used to form a spiral in a lathe machine tool. Thereafter, a high-frequency heat treatment process is performed. Recently, a whirling-type cutting method has emerged. This method can perform hard turning in the rotating direction of the spiral portion of the ball screw shaft by rotating and mounting multiple tools. The whirling method can be applied to the heat-treated material. In this study, an experimental apparatus was constructed to analyze the whirling spindle. The experiment proceeded in four steps. The rotating speed of the whirling spindle was set to ISO random and sequential rising conditions. Cooling and non-cooling modes in the cooling jacket were tested. As a result of the above experiment, the heating characteristics of the whirling spindle were derived.

A Study of People's Lives and Traditional Costumes in Goryeo Dynasty (고려시대 사람들의 삶과 전통의상에 대한 고찰)

  • Choi Kyu-Seong
    • The Research Journal of the Costume Culture
    • /
    • v.12 no.6 s.53
    • /
    • pp.1060-1069
    • /
    • 2004
  • We can study and judge the costumes of the Three Kingdom period through an ancient tomb murals and various burial mound(clay) figures, however, it is quite difficult to search for costumes of the Goryeo period ($960{\sim}1392$), because dresses from this era were rarely found, related antiquities are limited and hard to survive. This is the reason why people say that the Goryeo Dynasty is the period of undiscovered era for its history of costumes in Korea. Fortunately, these days, there are various kinds of buddhist statues discovered with its burial accessories such as costumes and dyed fabrics of the Goryeo era. Through these, we can glimpse through the Goryeo cloths and develop our researches on this field. In addition, a man called Seo Geung(서긍, the Chinese scholar Xu Jing) wrote a book in the 12th century about peoples lives in Goryeo and in this book, there are few documents about the people's costumes which help us to understand the period's traditional dresses. In this paper, we will look for the traditional costumes which were formed and developed through people's lives in Goryeo, using remains from various burial accessories in buddhist statues as well as the documents related to the costumes written in ${\ll}$Goryeosa 고려사${\gg}$. Moreover, costumes of a period usually developed and influenced by the atmosphere of people's lives both economically and mentally, therefore, in this study, we will especially focus on the dresses of the bureaucratic officials and their wives, who led comfortable lives and latitude of mind. Through the records, like Silla, Goryeo exported Sehjeo(세저) and Sehjoongmapo(세중마포) to China. And we found out that Silla's skillful weaving techniques of hemp and ramie cloths were succeeded to Goryeo. According to above facts, Goryeo people made clothes with various kinds of fabrics such as, different sorts of silks, ramie, hemp cloths and cottons. They also have very skillful manufacturing techniques for certain textiles. Their official robes were generally influenced by Tang and Song Dynasty, but, like ordinary people, we found out that the government officials also wore baji(pants) and a jeogor(jacket), which were traditional costumes since the Unified Silla Kingdom with various coats. Especially, women's costumes such as jeoksam(unlined summer jacket) and hansam(한삼), which are sort of jeogori(jacket), baji(pants) and chima(skirts) were made of various kinds of silks and ramie cloths, that were generated from the Goguryeo Kingdom, with jikryeongpo(a long jacket and striped skirt).

  • PDF

Thermal Characteristics and Frequency Analysis of a High Speed Spindle for Small Tapping Center (소형 태핑센터 주축의 열특성 및 주파수 분석)

  • Choi, Dae-Bong;Kim, Soo-Tae;Ro, Seung-Kook;Cho, Hyun-Taek
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.11 no.2
    • /
    • pp.105-111
    • /
    • 2012
  • High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools. The important problem in high speed spindle is to minimize the thermal effect by motor and bearing and frequency effect. This paper presents the thermal characteristic analysis and frequency experiment for a high speed spindle considering the flow rate of cooling oil. A high speed spindle is composed of angular contact ceramic ball bearings, high speed built-in motor, oil cooling jacket and so on. The thermal analyses of high speed spindle need to minimize the thermal effect and maximize the cooling effect and they are carried out under the various cooling conditions. Heat generations of the bearing and the high speed motor are estimated from the theoretical and experimental data. To find out the characteristic of vibration, the high speed spindle is excited in operational range. This result can be applied to the design and manufacture of a high speed tapping spindle.