• Title/Summary/Keyword: Cutting Quality

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Development of Versatile CAM System (PosCAM) Supporting CNC Shop Floor Operation (CNC Shop Floor 조업지원용 다능형 CAM시스템 (PosCAM) 개발)

  • 서석환;지우석;김성구;홍희동;조정훈;정대혁;김창남
    • Korean Journal of Computational Design and Engineering
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    • v.4 no.4
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    • pp.339-349
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    • 1999
  • The punose of this paper is to introduce the comprehensive CAM system (called PosCAM) supporting various function requested from shop floor operators. PosCAM is comported of two subsystems (PosCAM I and PosCAM II) which are designed to make up for the contemporary CAD/CAM systems. PosCAM I is mainly for : a) verifying the part programs written in both custom macros and standard G-codes, b) enhancing machining productivity and quality with built-in cutting conditions and feedrate optimization algorithm. PosCAM II is for : a) efficiently managing the numerous part programs and tool data stored in CNC memory, and b) integratively controlling and monitoring various CNCs from the control center through RS-422 with DNC 2 protocol. The developed systems have been tested via various experiments, and can be Applied for the industrial CNC machine shop as a means for enhancing productivity. The PosCAM system has been implemented and successfully used in the Machine Shop Department of PosCAM since march 1998.

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A Study on Design and Implementation of Automatic Product Information Indexing and Retrieval System for Online Comparison Shopping on the Web (웹 상의 온라인 비교 쇼핑을 위한 상품 정보 자동 색인 및 검색 시스템의 설계 및 구현에 대한 연구)

  • 강대기;이제선;함호상
    • The Journal of Society for e-Business Studies
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    • v.3 no.2
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    • pp.57-71
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    • 1998
  • In this paper, we describe the approaches of shopping agents and directory services for online comparison shopping on the web, and propose an information indexing and retrieval system, named InfoEye, with a new method for automatic extraction of product information. The developed method is based on the knowledge about presentation of the product information on the Web. The method from the knowledge about presentation of the product information is derived from both the point that online stores display their products to customers in easy-to-browse ways and heuristics made of analyses of product information look-and-feel of domestic online stores. In indexing process, the method is applied to product information extraction from Hypertext Markup Language (HTML) documents collected by a mirroring robot from online stores. We have made InfoEye to a readily usable stage and transferred the technology to Webnara commercial shopping engine. The proposed system is a cutting-edge solution to help customers as a shopping expert by providing information about the reasonable price of a product from dozens of online stores, saving customers shopping time, giving information about new products, and comparing quality factors of products in a same category.

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Filler effect of inner-structure bonded sheet metal in shearing process (내부구조재를 가진 중공형 접합판재의 전단가공특성에서 틈새효과에 관한 연구)

  • Kim, Ji-yong;Jung, Wan-jin;Kima, Jong-ho
    • Design & Manufacturing
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    • v.2 no.1
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    • pp.15-19
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    • 2008
  • While recent industrial structure is various, it is small quantity batch production structure, and products requiring of various functions are increasing. In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

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Fuzzy Logic Controller Design By Means Of Characteristic Design Parameters in a LASER Surface Hardening Process (단순화된 설계인자에 의한 레이저표면경화공정의 퍼지제어기 설계)

  • 박영준;김재훈;조형석
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.292-292
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    • 2000
  • Since high-power CO$_2$ Laser can be make a high densed energy to Local processing area, manufacturing processes using the laser can be processed for very Localized areas at a very fast rate with minimal or no distortion. Accordingly, the laser has been widely used in the fields of thermal manufacturing processes such as welding, fusion cutting, grooving, and heat treatment of metals. In particular, interest in the laser heat treatment process has grown tremendously in the past few years. In this process, maintaining the uniform hardening depth is important problem to obtain good quality products and to reduce heat induced distortion and residual stress. For achieving this objective, we introduced a new design technique of a fuzzy logic controller that greatly simplified the design procedure by defining several simplified design parameters. In the design procedure, the major design parameters of the controller are characterized by identifying several common aspects. From a series of simulation results, we found that the proposed design technique can be effectively used to design of a fuzzy logic controller for the LASER surface hardening process.

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Micro-Crack Analysis from Ultra-Precision Diamond Turning of IR Optic Material (적외선 광학 소재의 초정밀 선삭가공시 발생하는 미세균열 연구)

  • Jeong, Byeongjoon;Kim, Geon-Hee;Myung, Tae Sik;Chung, Eui-Sik;Choi, Hwan-Jin;Yeo, In Ju;Jeon, Minwoo
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.11
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    • pp.905-910
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    • 2016
  • Infrared (IR) optic lens can be fabricated by a single point diamond turning (SPDT) machine without subsequent polishing process. However, this machining process often leaves micro-cracks that deteriorate the surface quality. In this work, we propose an experimental design to remove micro-cracks on IR lens. The proposed design gathered data between cutting process condition and Rt surface roughness. This is of great importance because the scale of micro-cracks is a few micrometer. Rt surface roughness is suitable for analyzing maximum peak height signals of the profile. The experimental results indicate that feed per revolution variable is one of the most dominant variable, affecting the generation micro-cracks on IR lens surfaces.

Experimental Study on the Surface Defects of Scribed Glass Sheets (절단 유리판의 표면결함에 관한 실험적 연구)

  • Kim, Chung-Kyun
    • Tribology and Lubricants
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    • v.24 no.6
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    • pp.332-337
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    • 2008
  • This paper presents the surface defect analysis based on the experimental investigation of scribed glasses. The scribing process by a diamond wheel cutter is widely used as a reliable and inexpensive method for sizing of glass sheets. The wheel cutter generates a small median crack on the glass surface, which is then propagated through the glass thickness for complete separation. The surface contour patterns in which are formed during a scribing process are strongly related to wheel cutter parameters such as wheel tip surface finish, tip angle and wheel diameter, and cutting process parameters such as scribing pressure, speed and tooling technique. The scribed surface of a glass sheet provides normal Wallner lines, which represent regular median cracks and crack propagation in glass thickness, and abnormal surface roughness patterns. In this experimental study, normal and abnormal surface topographic patterns are classified based on the surface defect profiles of scribed glass sheets. A normal surface of a scribed glass sheet shows regular Wallner lines with deep median cracks. But some specimens of scribed glass sheets show that abnormal surface profiles of glass sheets in two pieces are represented by a chipping, irregular surface cracks in depth, edge cracks, and combined crack defects. These surface crack patterns are strongly related to easy breakage of the scribed glass imposed by external forces. Thus the scribed glass with abnormal crack patterns should be removed during a quality control process based on the surface defect classification method as demonstrated in this study.

Theory and Practice of Cover Crops Growing in Orchard (과수원 피복작물 재배의 이론과 실제)

  • 송기철
    • Korean Journal of Organic Agriculture
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    • v.9 no.4
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    • pp.95-111
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    • 2001
  • To carry out the Integrated Fruit Production(IFP), researches on cover crops as well the Integrated Pest Management(IPM) and the Integrated Nutrition Management(INM) should be very important. These concepts are neither clear nor connective till now. The researches on cover crops in Europe and USA are being kept within the category of IFP. Main researches on fruit trees for sustainable agriculture in Italy are new variety creation, development of growing techniques, pest and disease control, and cover crops management, etc. It is necessary of fruit industry in Korea to maintain good quality and taco-friendly fruit production. For this goal, we need international cooperation with highly developed countries in Europe. In first step, we should enlarge research areas and analyze results obtained to get farmers understood the concept of cover crop growing, Furthermore, we make researches more profoundly on cover crops growing considering tree age, mixing rates among cover crops, seeding and cutting time for cover crops, and so on. Researchers, specialists of agricultural extensions, and farmers should concentrate their opinions and conduct IFP together. The IFP should go on systematically and reach finally to get certificates internationally by the International Organization for Biological and integrated Control of Noxious Animals and Plants(IOBC) to enhance selling and exporting fruits.

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Effects of Stubble Height, Irrigation and Nitrogen Fertilization on Rice Ratooning in Korea

  • Shin, Jong-Hee;Kim, Sang-Kuk;Park, Sang-Gu
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.60 no.4
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    • pp.431-435
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    • 2015
  • Rice (Oryza sativa L.) ratooning is the production of a second rice crop from the stubble left behind after the main crop harvest. The objectives of this study were to evaluate the effects of main-crop stubble height, irrigation and fertilization on ratoon grain yield. Main crop 'Jinbuol' rice cultivar was harvested to leave with 10, 20, 30, or 40 cm stubble height. When the main crop stubble was harvested with 10 cm height, ratoon rice grain yield was increased by 2,810 kg/ha. Irrigation on stubbles after main crop harvest did not affect the ratoon crop yield and rice quality. The results showed a large variation in the ratoon performance by fertilizer application methods. Top-dressed nitrogen fertilizer on the stubble after harvest caused increase in panicle production and higher maturity rate. However, there was no significant difference in protein content, amylose content of milled rice and cooked rice characters between plots managed with and without nitrogen fertilizer.

A Study on the Conditions of Apparel Products of Stretch Material(I) (스트레치소재(素材) 의류제품(衣類製品)의 생산실태(生産實態) 硏究(I))

  • Park, Jin-Young;Sohn, Hee-Soon
    • Journal of Fashion Business
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    • v.1 no.3
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    • pp.35-44
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    • 1997
  • The purpose of this study is to the processes and quality of local women's apparel production using the stretch fabric and to address the problems related to production in order to provide useful data for producing competitive apparels. The result of the survey can be summarized as follows; 1. Results of surveying the process for raw materials and notions indicated that most of the workers were ignorant of the properties of stretch fabrics. And most factories were stacking the stretch fabrics across improperly, while being aware of the properties of the fabrics through their experiences or in-company test. 2. The major problem involving spreading fabrics was the uneven tension, followed by static electricity, overlap and warp twist. The problems involving the cutting work were melting of the fabric by cutter and difference of size between upper and lower parts. 3. Most of the businesses were not tempering the fabric before and after its linking works due to lack of working space, short delivery time, ignorance and etc. The majority of the sample businesses were operating their cutters at the speed of 3,000 rpm or higher, which suggests a poor technological guidance.

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Changes in Chemical Components of Chungkugiang Prepared with Small Black Bean (소립검정콩 청국장의 화학성분 변화)

  • 손미예;권선화;성찬기;박석규;최상도
    • Journal of Life Science
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    • v.11 no.3
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    • pp.284-290
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    • 2001
  • Changes in chemical components of small black bean chungkugjang(SBBC) added with kiwi and radish as foodstuffs to repress off-odor and enhance the quality of SBBC suring fermentation were investigated. Optimal pretreatment conditions of small black bean suitable to the fermentation of chungkugjang were 3 hrs of soaking time 1.5 times of ratio of water to black bean. 1.0 atm of high pressure, 20 min of heating time, cutting and crushing of heat-treated black bean. Moisture content of SBBC was remarkably lower than that of soybean chungkugjang(SBC) as control. Crude protein of SBBC was in the range 23.37∼25.71% and higher than that of SBC, Crude lipid of SBBC was lower than that of SBC. Crude lipid of SBBC added with kiwi and radish paste was decreased than that of SBBC without two foodstuffs. pH of SBBC were rapidly increased to 24 hrs of fermentation and gradually increased thereafter. Total acidity was shown to be reversely decreased as compared to pH tendency. Reducing sugar was increased to 24 hrs of fermentation and then decreased. In SBBC and SBC, potassium was the most abundant followed by phosphorus, magnesium and calcium.

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