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엔드밀을 이용한 곡면모델 CNC 절삭경로의 가공성능 향상
맹희영(Heeyoung Maeng),서창길(Changgil Suh) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The characteristics of terrace volume of rough cutting are analysed in order to investigate the variation of cutting force and cutting area formation. The cutting forces are analysed by comparing the result of numerical analysis on the measurement of cutting force and theoretical prediction of cutting area formation and specific cutting volume. Terrace volume workpieces are manufactured with 19 different shapes according to the variation of terrace volume factor, tool diameter factor, and cutting depth factor. Each workpiece is machined by CNC machining center with flat end mill along the round surface of terrace volume. The variation of cutting force is measured by dynamometer. It is verified that theoretical prediction of cutting area formation is correspond to practically measured cutting force and the cutting force valued by numerical analysis. The value of terrace volume after rough cutting shall be utilized as adaptive controlled data for variable feed which makes possible to control the cutting force within a specific value at the processing of terrace volume.
맹희영(Heeyoung Maeng),백은표(Eunpyo Baek),유준상(Jun-sang Yoo) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
The new grinding mechanism is developed in this paper so as to machine the BioMTA compacters, which is used for inserting the dental clinic paste into a small size hole. The optimum grinding parameters are determined by investing the machined state of test samples, such as helix angle, tilting angle, depth of groove, and wheel geometries. Also, the compaction effect of test sample are evaluated by comparing these samples with commercial brand samples. So. it is proved that this mechanism is adequate for the grinding of spirally tapered workpieces.
Polishing Characteristics of Machined Surface by Ball End Milling
맹희영(Heeyoung Maeng),백은표(Eunpyo Baek) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The experimental polishing characteristics of machined surface after ball end milling are studied quantitatively to investigate the optimum machining conditions(i.e. crossfeed and cutter size in ball end milling) which minimize the total machining time including polishing and milling process. The polishing efficiency is investigated during the polishing experiment, and then eventually polishing time is evaluated for various kinds of conditions, and it is finally analyzed the total machining time which is estimated by adding the milling time to the polishing time of corresponding testpieces.
맹희영(Heeyoung MAENG),임충혁(Choong-Hyuk YIM) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.2
It is presented in this study a new efficient intelligent machining strategy, which can be used to remove the uncut volume at the boundary region of curved surfaces caused by cutter interference. The geometric form definitions and recognition of topological features of the surface triangulation mesh are used to generate cutter paths along successive and interconnected steepest pathways, that minimize the cusp height left after flat end milling. In order to machine the uncut volume gradually, the z-map cutter centers are adjusted to avoid cutter interference for the 6 kinds of avoidance types. And then, the generative subsequent paths are sequenced to determine the second step cutter paths for the next uncut volume. For the 2 kinds of test models with convex and concave surface region, the implemented software algorithm is evaluated by investigating the residual swelling of uncut volume for each machining step.
OrthoMTA 컴팩터의 크리프피드 CBN 연삭을 위한 드레싱 조건 연구
맹희영(Heeyoung Maeng),백은표(Eun-pyo Baek) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.1
An OrthoMTA compacter is made by machining a Ni-Ti alloy wire using tapered helix creep-feed grinding machines. This aim of this study is to find the optimal dressing conditions to sharpen the corner of a cubic boron nitride (CBN) wheel. On the basis of the results of various experiments, it is verified that the most important factors in dressing are the dressing depth and feeding method, whereas the feed rate has less importance for producing a smaller corner R value. The study also finds the optimum dressing depth to reduce the dressing time, a feeding speed and method to stabilize the machining, and the mesh grade for the CBN wheel to make the groove of the compacter deeper.
Polishing Characteristics of Cusp Volume Left After Ball End Milling
맹희영(Heeyoung Maeng),김명수(Myoungsoo Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The polishing characteristics of machined surface after ball end milling are studied in this paper quantitatively to investigate the optimum machining conditions(i.e. crossfeed and cutter size in ball end milling) which minimize the total machining time including polishing and milling process. The polishing experiments are formulated into the incremental changing task of sand paper meshes bounded by the allowable limit roughness for each abrasive grit size. Testpieces are prepared by milling the flat steel block to have the terraced surface for the different milling crossfeed and cutter size, and the polishing devices is installed on a grinding machine table, which simulates the actual polishing work as specified stroke and acting pressure. The polishing efficiency is investigated during the polishing experiment, and then eventually polishing time is evaluated for various kinds of conditions, and it is finally analyzed the total machining time which is estimated by adding the milling time to the polishing time of corresponding testpieces.
맹희영(Heeyoung Maeng),박주욱(Juwook Park),박홍근(Hongkeun Park) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.6
When many holes on a plane are machined simultaneously, the positional precision and machining efficiency are very important. Multi-spindle heads are typical order making products of which the number of shafts and hole positions vary depending on the size or form of the product. For the automatic design of multi-spindle heads, the design modules for power transmission systems for drive, idle, and spindle shafts were developed, and a design technique the determining the optimum position and number of idle shafts according to gear positions was developed. In addition, for the precise determination of the multi-spindle head, the design methods for the guide planes of columns, and feed mechanisms were devised. In addition, the design modules for accurate clamping and automatic transportation mechanisms were developed. Finally, in order to simplify and standardize the design process, the design analysis and simulation verification modules are integrated.