• Title/Summary/Keyword: milling experiment

Search Result 204, Processing Time 0.031 seconds

Milling Characteristics of Cutting-Type Rice Milling Machine - According to Cutting Roller Induced Guide Angles -

  • Cho, Byeong-Hyo;Kang, Tae-Hwan;Lee, Dong-Il;Won, Jin-Ho;Lee, Hee-Sook;Han, Chung-Su
    • Journal of Biosystems Engineering
    • /
    • v.42 no.2
    • /
    • pp.112-116
    • /
    • 2017
  • Purpose: The purpose of this study was to analyze the milling characteristics of white rice depending on the guide angles of the cutting roller's induced guide, as well as to verify optimum milling conditions for the cutting-type milling machine. Methods: Brown rice, which was produced in Cheongju-si, Chungcheongbuk-do, Republic of Korea, in 2014, was used as the experimental material. The milling characteristics of white rice were measured under six different guide angle levels of the cutting roller, which were none, $0^{\circ}$, $5^{\circ}$, $10^{\circ}$, $15^{\circ}$, and $20^{\circ}$. The quantity of brown rice for each experiment was 500 kg, and the milling characteristics were measured according to the whiteness, rice temperature, cracked rice ratio, broken rice ratio, and energy consumption. Results: The whiteness of white rice maintained a uniform level, indicating at range of $38{\pm}0.5$, regardless of the cutting roller guide angles under all conditions. The rice temperature rise during milling was found to be rather low, at $13.9^{\circ}C$ and $13.6^{\circ}C$ at $10^{\circ}$ and $15^{\circ}$ guide angles, respectively. The cracked rice ratio after milling was 18.67%-19.47%, and the broken rice ratio was 0.68% at a $10^{\circ}$ guide angle, which is the lowest in comparison to other guide angles. Energy consumption was lower when the guide was used compared to that with-out the use of the guide. The energy consumption tended to increase as the cutting roller guide angle increased. Conclusions: From the above results, we conclude that the cutting roller guide angles of $0^{\circ}$ and $10^{\circ}$ are suitable for producing high quality rice during milling with a cutting-type milling machine.

A Study on the Working Condition Effecting on the Maximum Working Temperature and Surface Roughness in Side Wall End Milling Using Design of Experiment (실험계획법을 이용한 엔드밀 가공 시 최대가공온도와 표면조도에 미치는 가공조건에 관한 연구)

  • Hong, Do-Kwan;Ahn, Chan-Woo;Baek, Hwang-Soon;Choi, Seok-Chang;Park, Il-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.8 no.3
    • /
    • pp.46-53
    • /
    • 2009
  • To find the working condition is one of the important factors in precision machining. In this study, we analyzed maximum working temperature by infra-red camera and surface roughness in side wall end milling using design of experiment (DOE): RSM(response surface methodology), ANOM(analysis of means) and ANOVA(analysis of variance) by table of orthogonal array. ANOM and ANOVA are well adapted to select sensitivity of design variables for maximum working temperature and surface roughness. The effective design variables and their levels should be determined using ANOM, ANOVA. RSM is presented 2nd order approximation polynomial of maximum working temperature and surface roughness is composed with design variables. Therefore, it is expected that the proposed procedure using design of experiment : table of orthogonal array, ANOM, ANOVA and RSM can be easily utilized to solve the problem of working condition.

  • PDF

A note on Methods of Milling Naked Barley and Wheat-Naked Barley Mixture (쌀보리 단독제분 및 혼합제분 방법에 관한 연구)

  • Cheigh, H.S.;Kwon, T.W.;Kim, H.K.;Kim, D.W.
    • Korean Journal of Food Science and Technology
    • /
    • v.7 no.2
    • /
    • pp.96-99
    • /
    • 1975
  • In order to establish an optimal flour milling method for naked barley, the tempering conditions, milling after pearling and mixed flour milling of naked barley with wheat were studied, and the following results were obtained. 1. For the tempering of naked barley, treatment for 48 hours at a moisture level of 13. 5% and addition of 0. 5% water prior to the flour milling is the most useful procedure. 2. The pearling of naked barley before or after tempering lowers the ash content in the flour, but the yield is reduced considerably and two steps of processing make the procedure unsuitable. 3. For the mixed flour milling, the mixing ratio of naked barley to wheat ranging from 10 : 90 to 20 : 80 is optimal.

  • PDF

The Parametric Influence on Focused Ion Beam Processing of Silicon (집속이온빔의 공정조건이 실리콘 가공에 미치는 영향)

  • Kim, Joon-Hyun;Song, Chun-Sam;Kim, Jong-Hyeong;Jang, Dong-Young;Kim, Joo-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.16 no.2
    • /
    • pp.70-77
    • /
    • 2007
  • The application of focused ion beam(FIB) technology has been broadened in the fabrication of nanoscale regime. The extended application of FIB is dependent on complicated reciprocal relation of operating parameters. It is necessary for successful and efficient modifications on the surface of silicon substrate. The primary effect by Gaussian beam intensity is significantly shown from various aperture size, accelerating voltage, and beam current. Also, the secondary effect of other process factors - dwell time, pixel interval, scan mode, and pattern size has affected to etching results. For the process analysis, influence of the secondary factors on FIB micromilling process is examined with respect to sputtering depth during the milling process in silicon material. The results are analyzed by the ratio of signal to noise obtained using design of experiment in each parameter.

An experiment of optimizing tools for Lap joint with 2tmm Aluminum alloy plate using FSW (2tmm AL-합금재의 겹침이음을 위한 교반용접의 실험적 연구)

  • 장석기;이돈출;김상진;전정일
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2002.05a
    • /
    • pp.153-160
    • /
    • 2002
  • This paper shows the possibility of performing Lap joint using the friction stir welding and the determination of tool's dimensions for FSW in Milling machine. This research also is reported on obtaining the tensile-shear strength, 9.319 ( kgf/mm$^{2}$) and the energy absorption, 2,682 (kgf-mm) under this experiment. The optimal tool's dimensions and method for Lap joint in 2tmm aluminum alloy plate using FSW is as follows; The diameter of shoulder and pin are 9 $\phi$mm and 3$\phi$mm, the length of pin is 3.6mm. The conditions of shoulder of tool is not pressed into original base metal.

  • PDF

Tool Breakage Detection in Face Milling Using a Self Organized Neural Network (자기구성 신경회로망을 이용한 면삭밀링에서의 공구파단검출)

  • 고태조;조동우
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.18 no.8
    • /
    • pp.1939-1951
    • /
    • 1994
  • This study introduces a new tool breakage detecting technology comprised of an unsupervised neural network combined with adaptive time series autoregressive(AR) model where parameters are estimated recursively at each sampling instant using a parameter adaptation algorithm based on an RLS(Recursive Least Square). Experiment indicates that AR parameters are good features for tool breakage, therefore it can be detected by tracking the evolution of the AR parameters during milling process. an ART 2(Adaptive Resonance Theory 2) neural network is used for clustering of tool states using these parameters and the network is capable of self organizing without supervised learning. This system operates successfully under the wide range of cutting conditions without a priori knowledge of the process, with fast monitoring time.

Effects of the Helix Angle on the Tool Deflection in End Milling (엔드밀 가공시 헬릭스각이 공구변위에 미치는 영향)

  • 맹민재;이성찬;정준기
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.373-377
    • /
    • 2002
  • In the end milling operation the deflection of the cutter is an important factor affecting the accuracy of machining with implications on the selection of cutting parameters and economics of the operation. The deflection of the end mill was studied both experimentally with strain gauge, tool dynamometer, laser measuring apparatus and on a finite element model of the cutting using ANSYS software. The deflection of machining tool with various helix angles was studied with FEM simulation and experiment. ANSYS analysis performed on the finite element model of the end mill provides deflection results which agree within 15.0% with the experimental ones.

  • PDF

A Pole-Assignment ACC System in the Peripheral End Milling Process (엔드밀링 공정에서 극점배치 구속적응제어 시스템)

  • Chung, Sung-Chong
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.5 no.2
    • /
    • pp.63-72
    • /
    • 1996
  • In order to regulate the cutting force at a desired level during peripheral end milling processes a feedrate override Adaptive Control Constraint (ACC) system was developed. The feedrate override function was accomplished through a development of programmable machine controller (PMC) interface technique on the NC controller, Nonlinear model of the cutting process was linearized as an adaptive model with a time varying process parameter. An integral type estimator was introduced for on-line estimation of the cutting process parameter, Zero order hold digital control methodology which uses pole-assignment concept for tuning of PI controllers was applied for the ACC system. Performance of the ACC system wsa confirmed on the vertical machining center equipped with fanuc OMC through a large amount of experiment.

  • PDF

Improvement of the Surface Roughness by Changing Chamfered Angle of the Insert in Face Milling (정면밀링가공에서 인서트의 챔퍼각 변화에 의한 표면거칠기 향상)

  • Kwon, Won-Tae;Lee, Seong-Sei
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.18 no.7
    • /
    • pp.155-160
    • /
    • 2001
  • A milling process with 45 degree chamfered inserts produces a perfect flat surface only in theory. It is due to many unwanted factors including thermal effect, dynamic effect, the problem of the controller used and the problem of accuracy of the machine tool. In this study, introduced is a method to improve the surface roughness by redesigning of the chamfer angle of the insert, which traditionally has been 45 degree. First, the relationship between the fixed machine coordinate and the relative coordinate on the insert is derived. This transfer matrix is used to determine the new insert angle to maximize the flatness of the machined surface. A newly designed insert is manufactured, and used to carry out the experiment. It is proved that she insert designed by the proposed method produced a much flatter surface than a traditional one.

  • PDF