금형용 초경합금재의 내면연삭 가공능률향상에 관한 기초적 연구

허성중,이규천,김영일,김원일 한국정밀공학회 1996 한국정밀공학회 학술발표대회 논문집 Vol.1996 No.6월

금형재료의 정밀연삭을 위한 다기공 다이아몬드 숫돌의 개발

허성중 한국기술사회 1997 技術士 Vol.30 No.6

Development of diamond wheel with fine grains and multi-pore structures were newely attempted to be studied in this paper. Wheels, that are employed for the smooth and mirrow finishing of die materials such as tungsten carbide alloy using tool and die materials, must have both performances to remove tool marks efficiently and to contact elastically with curved surfaces. Diamond abrasive grains were bonded firmly by a melamine to prevent the decrease of machining efficiency due to grain sinking within the bond materials. Also, highly foamed structures were developed to increase the flexibility of the wheel, and to induce active self-sharpening by increasing contact pressure between the wheel and work sufaces. In this paper, melamine-bonded diamond wheels are trial manufactured, then the forming method of wheels are explained.

난삭재의 초정밀.고능률 연삭가공을 위한 다이아몬드숫돌의 개발

허성중,Heo, Seong-Jung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12

Development of diamond wheel with fine grains and multi-pore structures were newely attempted. Wheels, that are employed for ultra precision and high performance grinding of difficult-to materials such as tungsten carbide alloy using tool and die materials, must have both performances to remove tool marks efficiently and to contact elastically with curved surfaces. Diamond grains were bonded firmly by a melamine resin to prevent the decrease of machining efficiency due to grain sinking within the bond materials. Also, highly foamed structures were developed to increase the flexibility of the wheel, and to induce active self-sharpening by increasing contact pressure between the wheel and work surfaces. In this paper, melamine-bonded diamond wheels are trial manufactured, then the forming method of wheels are suggested, and the grinding characteristics of wheels are also illustrated.

과공정 AI-Si 합금의 SEM내 가열절삭

허성중,이현철,권순익,김홍배,김원일 한국정밀공학회 2003 한국정밀공학회 학술발표대회 논문집 Vol.2003 No.10월

Image Processing을 이용한 주사형 전자현미경내 절삭거동 해명

허성중,공기훈 한국기계기술학회 2000 한국기계기술학회 학술대회논문집 Vol.2000 No.-

전자현미경내 마이크로 절삭의 화상처리에 의한 절삭 기구 해석

허성중 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.3

This research analyzes the cutting mechanism of A1100-H18 of commercially pure aluminum by image processing in SEM(Scanning Electron Microscope) for the measurement of strain rate distribution near a cutting edge in orthogonal micro-cutting. The distribution is measured using various methods in order. The methods are in-situ observations of cutting process in SEM, inputting image data, a computer image processing, calculating displacements by SSDA(Sequential similarity Detection Algorithm) and calculating strain rates by FEM. The main results obtained are as follows: (1) It enables to measure a microscopic displacement near a cutting edge. (2) An application of this system to cutting process of various materials will help to make cutting mechanism clear.

Image Processing을 이용한 주사형 전자현미경내 절삭거동 해명

허성중,공기훈 한국기계기술학회 2000 한국기계기술학회 학술대회논문집 Vol.2000 No.2

CFRP의 振動切削時 工具摩滅에 관한 硏究

김원일,김용조,허성중 慶南大學校 附設 工業技術硏究所 1993 硏究論文集 Vol.11 No.-

本 論文은 難消材의 一種인 CERP(Carbon Fiber Reinforced Plastic)를 振動切削時, 切削條件 및 纖維角에 따른 工具摩減 程度를 考察해 본것으로서, 그 結果 얻은 重要한 結論은 다음과 같다. 1) 振動 切削時 CFRF의 切削性의 纖維角이 클수록 工具摩減은 增加하며, 纖維角이 15。, 切削속도 30m/min일때의 條件에서 工具壽命이 가장 김을 알수있었다. 2) P10系 超硬合金을 使用하여 CERP를 振動切削하였을때 테일러의 工具方程式의 指數값 n=0.375~0.416 및 常數값 C=139.2~175.9를 重線形 回歸分析法으로 얻을 수 있었다. 3) 常用切削과 振動切削에 의한 工具摩減량을 비교한 結果, 切削速度 30m/min일 경우 振動切削이 常用切削보다 약 8培 정도 工具摩減量이 減少하였다. 4) 工具摩減量은 振動旋削에 있어서도 切削速度, 工具移送 및 切削깊이에 영향을 받는 것을 알 수 있었다. This investigation examines the amount of tool flank wear in vibration turning of CFRP which is known to have bad machinability. The results obtained from the experiments are summarized as follows: 1) For cuttingability of CFRP in vibration turning, the amount of tool flank wear increases according as the fiber angle increases. It is found out that the best condition for the tool life in vibration turning of CRFP is 15。for the fiber angle and 30m/min for the cutting speed. 2) The Taylor's tool life equation is applied by using the multiple linear regression technique to the vibration turning of CFRP with the P10 grade tungsten carbide tools. The exponential value, n=0.337~0.416, and the constant value, C=139.2~175.9 are obtained. 3) The amount of tool flank wear by vibration turning is compared with that from the conventional turning. It reveals that at the cutting speed of about 30m/min the vibration turning may reduce by about eight times the amount of tool flank wear of the conventional turning. 4) It is found out from the present investigation that the amont of tool wear is affected by cutting speed, feed rate, and depth of cut in vibration turning as well.

MLRA에 의한 초경합금재의 연삭저항 실험식 지수값에 관한 연구

김원일,왕덕현,허성중 慶南大學校 附設 工業技術硏究所 1994 硏究論文集 Vol.12 No.-

본 논문은 범용 평면연삭기를 가지고 초경합금재를 가공할 때 소정의 정밀도를 유지하면서 가공 능률향상을 위한 실험적인 최적 조건을 연삭저항 결과치를 중점적으로 연삭비등의 변화를 통해 규명하고, 연삭저항의 기구 및 다양한 실험 결과에 대해 컴퓨터를 이용한 중선형회귀분석(MLRA: Multiple Linear Regression Analysis)으로 연삭저항의 실험식에 관한 지수값을 결정하고, 실험의 결과와 비교하여 그 타당성을 규명하여 향후, 고경질 난삭재의 연삭에 있어서 지식 전문가 시스템 (Knowledge based expert system)을 구축하기 위한 기본적 지식베이스(Knowledge base)등에 활용될 수 있도록 하고자 하였다. This paper described the surface grinding condition of WC-Co using diamond abrasive grinding wheel in order to increase the grinding efficiency. Computer program of MLRA(Multiple Linear Regression Analysis) was used to decide exponent values of experimental formula of grinding resistance. These results were compared with the experimental ones. Analytical results by MLRA were found to agree with the experimental ones. Accordingly, these results will be used knowledge base to construct knowledge based expert system on surface grinding of high strength engineering materials.

3次元 切削力의 豫測에 관한 硏究

金元鎰,李允景,許盛中 慶南大學校 附設 工業技術硏究所 1990 硏究論文集 Vol.8 No.-

3次元 切削의 理解를 돕기 위하여 3次元 切削力을 豫測하는 數學的인 模型이 必要하다. 3次元 切削力 豫測의 한가지 方法은 理想化된 工具面 上에서의 2次元 金屬切削理論을 利用하는 것이다. 圓周方向, 接線方向과 軸方向으로 作用하는 切削力(主分力, 背分力, 移送分力)은 座標變煥에 의해 얻어질 수 있다. 實驗結果는 긴 被削材의 旋削에서 3次元 切削力을 正確하게 豫見하는 理想化된 模型을 나타낸다. 實驗結果도 參考資料에서 說明된 다른 分析的인 模型과 比較되어지며 그 結果 다음과 같은 사항들이 얻어졌다. 1. 2次元이라고 假定한 切削의 參照面에서 切削力이 豫測되고 이 힘들은 切削工具面 上의 傾斜面 座標를 回轉하였다. 2. Stabler에 의해 提案된 ??=i의 假定을 使用하여 3次元 切削力을 豫測할 수 있다. 3. 3次元 旋削實驗 結果는 理想化된 模型과 잘 一致하였다. To improve understanding of three-dimensional turning, it is useful to have a mathematical model which predicts three-dimensional cutting forces for this process. One method of predicting three dimensional cutting forces is to apply two-dimensional metal cutting theory on a plane (which must be identified) where the cutting process appears to be two-dimensional. The forces which set act on the workpiece in the radial, tangential, and axial directions can then be obtained by a coordinate transformation. Experimental results show the matrix moded accurately predicts three-dimensional cutting forces in turning of long slender workpiece. Experimental results are also compared to other analytical model described in the literature. The results obtained are as follows; 1. Cutting forces are then predicted in a reference plane where cutting is assumed to be two-dimensional, and these forces are rotated to a set of orthogonal axes on the cutting tool. 2. Three dimensional cutting force was obtained by the use of ?=i proposed by Stabler and energy method for three dimensional cutting force. 3. Experimental results of three dimensional turning showed good to matrix model predictions.