• Title/Summary/Keyword: Side cut

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Design of Side Cores of Plastic Injection Mold with Interference Check (플라스틱 사출금형의 간섭 검사에 의한 사이드 코어의 설계)

  • 신기훈;이건우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.6
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    • pp.1064-1074
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    • 1992
  • Eliminating the under-cut caused by interference between a mold and a product in designing a mold for in jection molding processes is a very important problem. In general, the under-cut problem can be avoided by side cores which are the principal members of a mold assembly. In this research, a procedure has been developed by which the side cores and the corresponding core and cavity plates of a mold are generated after identifying the mold faces preventing product faces from moving while being discharged. The characteristic features of the procedure suggested in this paper are as follows. One is that the interference faces between the product and the mold are derived only from the core plate(or cavity plate) alone without considering the product together. The other is that the algorithm in the designing of side cores and modifying molds, is very efficient because it uses Euler operations instead of Boolean operations.

Feedrate Optimization Using CL Surface (공구경로 곡면을 이용한 이송속도 최적화)

  • 김수진;정태성;양민양
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.4
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    • pp.39-47
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    • 2004
  • In mold machining, there are many concave machining regions where chatter and tool deflection occur since MRR(material removal rate) increases as curvature increases even though cutting speed and depth of cut are constant. Boolean operation between stock and tool model is widely used to compute MRR in NC milling simulation. In finish cutting, the side step is reduced to about 0.3mm and tool path length is sometimes over loom, so Boolean operation takes long computation time and includes much error if the resolution of stock and tool model is larger than the side step. In this paper, curvature of CL (cutter location) surface and side step of tool path is used to compute the feedrate for constant MRR machining. The data structure of CL surface is Z-map generated from NC tool path. The algorithm to get local curvature from discrete data was developed and applied to compute local curvature of CL surface. The side step of tool path was computed by point density map which includes cutter location point density at each grid element. The feedrate computed from curvature and side step is inserted to new tool path to regulate MRR. The resultants were applied to feedrate optimization system which generates new tool path with feedrate from NC codes for finish cutting. The system was applied to the machining of speaker and cellular phone mold. The finishing time was reduced to 12.6%, tool wear was reduced from 2mm to 1.1mm and chatter marks and over cut on corner were reduced, compared to the machining by constant feedrate. The machining time was shorter to 17% and surface quality and tool was also better than the conventional federate regulation using curvature of the tool path.

Studies on the Emergence Ratio of Bombyx mori, between Cut off the Cocoon′s Edge Layer or not for Egg Production (종견의 절개와 발아율(탈견율) 간의 관계연구)

  • 김윤식
    • Journal of Sericultural and Entomological Science
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    • v.13 no.2
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    • pp.151-154
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    • 1971
  • In the silkworm egg production, cutting of the cocoon's edge formed by silkworms forced to aid the emergence, and emergence is related to the amount of alkaloid liquid in the sucking stomach in certain varieties. In this study, there was no difference between cutting of portion and sex, and no significant between cutting of both sides and one side cocoons when comparing their emergence ratio. Expenditures and emergence ratio between both sides and one side cutting off must be studied in coming future.

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$LiNbO_3$ Self-aligned Ridge Waveguide with Dielectric Side Buffers (측면 완충영역을 갖는 $LiNbO_3$ 자기정렬 리지 광도파로의 제작)

  • 조영보;정형기;신상영
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.783-786
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    • 2003
  • A simple fabrication method of self-aligned ridge waveguides with dielectric side buffers is demonstrated on +Z- cut LiNbO$_3$. The ridge waveguide is fabricated by a combination of the annealed proton exchange process and the proton-exchanged wet etching technique. The self-aligned process is achieved by wet etching of aluminum.

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A New Tent Roost of Thomas' Fruit-eating Bat, Artibeus watsoni (Chiroptera: Phyllostomidae), in Panama

  • Choe, Jae-Cheon
    • Animal cells and systems
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    • v.1 no.2
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    • pp.313-316
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    • 1997
  • Thomas'fruit-eating bat, Artibeus watssoni, is known to alter leaves of a wide variety of tropical plants to construct tent roosts. On Barro Colorado Island and Gigante Peninsula in the canal zone, Panama, A. watsoni is found to use the black palm, Astrocaryum standleyanum, as its tent plant. Bats cut the first five to ten pinnae from the proximal side of the terminal blade and chew additional four to nine pinnae without severing their central veins. The distance from the frond rachis to the cut decreases distally leaving an inverted V-shaped cut path. The distal portions of the bifurcated blade are then collapsed and folded to form the'bifid'tent with an inverted boat-shaped cavity underneath. All tents were in fronds of trunkless juvenile plants.

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Investigation of Pressure drop on shell side of shell and tube heat exchanger (원통다관식 열교환기의 쉘측 압력 손실의 연구)

  • Lee, Y.B.;Han, S.G.;Ko, J.M.
    • Journal of Power System Engineering
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    • v.12 no.3
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    • pp.32-37
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    • 2008
  • The present work aims to determine the overall pressure losses in the shell from the point of entry of the fluid to the outlet point of fluid of shell and tube heat exchanger. The main contribution of the present work is concerned with calculating the pressure drop in the interior section and window section. Shell-side flow velocity distributions have been evaluated. We assume that the shell-side fluid is turbulent. The calculation procedure is based upon the Delaware method. Evaluation of pressure drop on the shell side will be helpful for a designer or manufacturer of a heat exchanger.

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A Study on Cutting Character of Side-rake Angle Adjustment at Non-ferrous Metals in Turning (비철금속의 선삭에서 측면경사각의 변화에 대한 절삭특성에 대한 연구)

  • Jung, Jin-Seo;Jun, Jae-Uhk;Han, Gu-Sang;Seo, Sang-Ha;Ha, Man-Kyung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.1
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    • pp.39-44
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    • 2003
  • In the present industry, there are necessary to cut not only iron metals but also non-ferrous metals such as aluminum, brass, plastic and wood(Paulownia) therefore it had been made the studies of non-ferrous metals by many scientists. The purpose of this study is to conduct the basic experiment about influencing of the feedrate adjustment and the change of the side rake angle at turning of non-ferrous metals. As the results, the surface roughnesses and Cutting force adjustments were on the decrease with a side-rake angle and feedrate diminution in the case of the plastic, brass, aluminum, and paulownia.

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A Study on Cutting Character of Side-rake angle Adjustment at Non-ferrous Metals in Turning (비철금속의 선삭에서 측면경사각의 변화에 대한 절삭특성에 대한 연구)

  • 전재억;정진서;권혁준;하만경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.929-934
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    • 1997
  • In the present industry, there are necessary to cut not only iron metals but also non-ferrous metals such as aluminum, brass, plastic and wood(Paulownia).therefore it had been made the studies of non-ferrous metals by many scientists. we hope this kind of study will continue. The purpose of this study is to conduct the basic experiment about influencing of the feedrate adjustment and the change of the side rake angle at turning of non-ferrous metals. As the results, the surface roughnesses and Cutting force adjustments were on the decrease with a side-rake angle and feedrate diminution in the case of the plastic, brass, aluminum, and paulownia

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Effect of Material Removal per Tooth on the Axial Shape of Prismatically Milled Parts (공구날당 소재제거량이 각주형상 밀링가공물의 축방향 형상에 미치는 영향)

  • Kim Kwang Hee
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.6
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    • pp.17-22
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    • 2004
  • A study for investigating the effects of the cutting conditions (radial depth of cut feed per tooth) and the number of tooth on the side wall of prismatically milled workpiece is described. This study is available not only for understanding the geometrical characteristics of the end milled side wall but also for finding the optimal cutting conditions. In this work, the side wall geometry was characterized by the straightness and the location of maximum peak point. Through this study, it was revealed that the geometrical characteristics of the end milled side wall are strongly related to the material removal per tooth and the number of tooth.

Evaluation for Installation and Drain Performance of Mountain Side Ditch in Road Cut Slopes (도로 절토사면 산마루측구 배수성능에 따른 사면안정성 평가)

  • Hwang, Young-Cheol
    • Journal of the Korean GEO-environmental Society
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    • v.5 no.4
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    • pp.73-79
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    • 2004
  • Mountain side ditch is constructed at the top of cutting slopes around road and it drains the surface water that flowed from upper part. Mountain side ditch is constructed to keep away the influx of the surface water into cutting faces. However, if Mountain side ditch is constructed on the top of cutting slopes, it is cause of trouble. For example, difficulty of quality control and lack of drainage faculty. Therefore, the faculty and establishment propriety of mountain side ditch are evaluated seriously, according to the condition of ground, topography and rainfall in this paper. Results from the study for the numerical analysis of effect of mountain side ditch indicate that safety factor is enlarged about 3% at rainfall.

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