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梁均懿,남궁석 충남대학교 공업교육연구소 1980 論文集 Vol.3 No.2
The cutting resistance of grooved and non-grooved workpieces and the tool life under various cutting conditions was investigated experimentally with the use of a tool dynamometer. The results of this experiment are as follows : 1) The cutting force (principal and feed forces) increases with increasing depth of cut due to the force of the impact (force) between tool and workpiece in interrupted cutting. 2) The tool life of a P 20 cutting tool reduces with increasing feed cutting speed, and number of grooves. 3) The life of a P 20 tool is exceedingly short by comparision to the tool life of a H.S.S. tool in proportion to the increase of number of grooves.
3차원 자유곡면 가공에 있어서의 공구간섭방지에 관한 연구
양균의,박윤섭,이희관 대한기계학회 1995 대한기계학회논문집 Vol.19 No.8
Tool interference is one of the most critical problems in sculptured surface machining. When machining cavities and concaves, the tool frequently overcuts the portions of the surface, which cause inaccuracy in machining. So tool interference-free paths must be generated for rough cutting more efficiently. In this paper a software using SSI(Surface/Surface intersection) algorithm is developed for eliminating tool interference which occurs in an offset surface in 3-dimensional free form surface modeling. this work consists of two stages : using the offset data, the intersection curves are rapidly checked by this algorithm at the first stage. CL(cutter location) data are obtained by deleting the loop section of intersected offset patches at the second stage. This algorithm can reduce the amount of memory required to store machining data and also easily check region which have the possibility of intersection. Also, This software is verified to be useful in machining a curved object on a DNC milling machine.
다구찌 실험 계획법을 이용한 고속가공에서 공구수명 조건의 최적화
양균의,임표 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.4
High Speed Machining(HSM) reduces machining time and improves surface accuracy because of the high cutting speed and feedrate. Development of HSM makes it allowable to machine difficult-to-cut material and use small-size-endmill. It is however limited to cutting condition and tool material. In the machining operation, it is important to check main parameter of tool life and select optimal cutting condition because tool breakage can interrupt progression of operation. In this study, cutting parameters are determined to 3 factors and 3 levels which are a spindle speed, a feedrate and a width of cut. Experiment is designed to orthogonal array table for L9 with 3 outer array using Taguchi method. Also, it is proposed to inspect significance of the optimal factors and levels by ANOVA using average of SN ratio for tool life. Finally, estimated value of SN ratio in the optimal cutting condition is compared with measured one in the floor shop and reduction of loss is predicted.
梁均懿 전북대학교 공업기술연구소 1983 工學硏究 Vol.13 No.-
The chip produced in course of machining usually exihibit a finite radius of curvature. The curling is performed without regard to the buile-up edge process of tool. Though a part of this may be due to the bending moment of the chip, the irregular deformation in cutting mechanism and the second folw on the rake face. But I've studied experimentally on how the cutting conditions effect the curling. I varied the rake angle from minus 50˚to the plus 50˚ by dividing them into 10 degrees of the difference, in addition, it was observed that the rake angle is related to tool-chip contact length. But tool with the minus angle did not make the curling chip, but small dust like chip. The experiment was made for the only plus rake angles and the results are as follows: 1. The chip curl radius was longer as the depth of cut, rake angle, the cutting speed and feed increase. 2. The longer the chip curl radius was, the more chip volume we have. 3. The tool-chip contact length decreased with increasing rake angle.
梁均懿,辛泰碩 충남대학교 공업교육연구소 1979 論文集 Vol.2 No.1
This paper describes that the cutting resistance of non-homogeneous workpiece siuch as mild steel having 6-4 brass fitted on 6 parts of grooved mild steel in turning operations with various cutting conditions by using tool dynanometer was investigated experimentally. The three components of cutting forces was recorded on the oscillograph, the size of workpiece was 50 ㎜ø × 300 ㎜ and Chemical composition of tool was w(18%) - Cr(4%) - V(1%). The results of this experiment are as follows; (1) The cutting forces increase with increasing depth of Cut, and feeds. (2) The cutting forces ( principal forces, feed forces) increase little by little till cutting velocity 60m/min, but the cutting forces increase rapidly from cutting velocity 60m/min to 110m/min and decrease from this point continously.