• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 춘계학술대회 논문집
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• pp.121-126
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• 1991

기계가공에서 발생하는 채터진도에 대한 발생기구나 이론적인 해석방법에 관하여는 많은 연구 가이루어져 왔으나, 그 발생점을 객관적으로 판정하기위한 엄밀한 규정이 마련되어 있지 않기 때문에 현재까지 공작기계의 성능평가에 하나의 지표가 되고 있는 채터진동 발생점의 판정에는 주로 인간의 귀나 눈에 의한 감각적인 판단방법에 의존하고 있는 실정이다. 본 연구에서는 객관적인 채터진동 발생점의 판정 및 그의 in-process 검출방법을 확립할 목적으로, 이를 이룩하는데 절삭저항의 이용 가능성을 실험적 인 방법으로 검토하고 있다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.63-68
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• 1996

In this study, the effect of tool rake angles and the change of cutting conditions on specific cutting pressure in face milling is investigated. The cutting force in face milling is predicted from the double cutting edge model in 3-dimensional cutting. Conventional specific cutting pressure model is modified by considering the variation of tool rake angles. Effectiveness of the modified cutting force model is verified by the experiments using special face milling cutters with different cutter pockets and various rake angles. From the comparison of the pressented model and the specific cutting pressure, it is shown that the axial force can be predicted by the tangential and redial forces without the knowledge of friction angle and shear angle. Also, the relation between specific cutting pressure and cutting cindition including feedrate, cutting velocity and depth of cut is studied.

• Composites Research
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• 제30권1호
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• pp.35-40
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• 2017

본 연구에서는 천연섬유 복합재료의 홀 가공 인자를 최적화 하기 위하여, 진공 인퓨전 성형공정을 이용하여 천연섬유 복합재료를 제조하였으며 보강재로는 아마섬유를 사용하였다. 그 후 가공에 적합한 드릴을 설계하고, 선정된 가공조건에 따라 홀 가공을 수행하였다. 실험횟수를 최소화하기 위하여 다구찌 실험계획법을 사용하였으며, 홀 가공 후 가공면내 거칠기를 측정하고 거칠기비 분석을 통하여 그 결과를 비교하였다. 실험결과 천연섬유 복합재료의 가공 시 절삭저항을 분산할 수 있는 새로운 드릴을 설계하였다. 이 드릴을 사용할 경우 가공중의 절삭저항이 분산되었으며, 표면거칠기가 최소화된 천연섬유 복합재료를 얻을 수 있었다. 또한 홀 가공에 적합한 최적의 드릴 회전속도 및 이송속도를 선정하였다.

• Tribology and Lubricants
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• 제6권1호
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• pp.82-88
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• 1990

마찰학적인 관점에서 피복초경공구의 피복층이 공구마멸에 미치는 영향을 조사하기 위하여 공구표면의 피복층을 선택적으로 제거한 후 마멸시험, 급속정지 실험 및 절삭력 측정 실험을 수행하였다. 실험 결과 피복층은 공구와 피삭재 사이의 점착성을 낮추어 점착마멸을 억제시키는 것으로 나타났으며, 마찰저항을 감소시켜 절삭력을 낮추는 것으로 관찰되었다. 또한 경사면상의 피복층이 플랭크 마멸의 성장을 저지하는 효과가 있는 것으로 나타났으며, 피삭재가 탄소강인 경우 경계마멸까지 고려할 때 다중피복공구가 가장 바람직한 것으로 관찰되었다.

• 한국산업융합학회 논문집
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• 제7권4호
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• pp.325-330
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• 2004

The forces acting on the tool are an important aspect of maching. For those concerned with the manufacture of machine tools, a knowledge of the forces in needed for estimation of power reguirements and for the design of machine tool elements tool-holders and fixtures, adequately rigid and free from vibration. The force reguired to form the chip is dependent on the shear yield strength of the work material un der cutting conditions which are cutting speed, workpiece, feedrate, insert type. In this study, FG, ML, MP, MC, C, RT inserts were investigated in turning using SM45C, SCM4, SKD11, SUS316, materials. The diameter of materials was 60mm, 80mm, 110mm. This paper presents MP were lowest and SKD11 were largest of the workpiece in cutting forces.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 춘계학술대회 논문집
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• pp.290-295
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• 2002

This research has been carried out to experiment machining characteristics by elements addition and subtraction of AC8B and sample that is used fur car piston materials. 1.Mechanical properties of development sample expressed unique mechanical properties than AC8B. 2. Cutting resistance of development sample decreased about 10% than AC8B according to increase of the cutting speed. 3. According to increase of the feedrate, all comparison workpiece found that specific cutting resistance decrease. 4. It was found that sample's machining characteristics that is developed by addition and subtraction of elements improves.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1997년도 춘계학술대회 논문집
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• pp.88-95
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• 1997

This study provides the useful actual data instead of the experience data using in industrial fields. Especially, values of each components of cutting force are effective in the rake angle, setting angle and cutting area. Many researches have been made on the work piece materials, kinds of bite materials, rake angle, nose radius and depth of cut, but a few on the bite setting angle. In order to select optimal cutting speed, it was summarized the following results are achieved; A chieved that an affect of cutting resistance on the setting angle is a little under giving experimental conditions and therefore a worker can be choose the value of it randomly.

• 한국정밀공학회지
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• 제1권2호
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• pp.58-68
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• 1984

In this study, the static and dynamic components of cutting resistance were measured with tool dynamometer (Swiss, pieso-electric type) when S45C, A1-alloy and brass were drilled under the some variable conditions. The results obtained are as follows; 1) The dynamic components of these cutting resistance are not related to the depth of drilled hole. 2) The static and dynamic components of cutting resistance are increased in accordance with the increase of feed and drill diameter. 3) The dynamic components of thrust force are increased in accordance with the increase of spindle speed. 4) The rate of the dynamic component to the static component is 0.3 .approx. 0.5 in torque, 0.1 .approx. 0.2 in thrust force. 5) The characteristic of the tool system is affected in dynamic component of cutting resistance, and the creasted frequency and amplitude of the chip are determined by the crilled materials. 6) The maximum amplitude of the dynamic component is increased proportionally in accordance with the feed rate and the spindle speed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.95-100
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• 1995

Automatic monitoring of cutting process is one of the most important technology for increasing the stability and the reliability of unmanned manufacturing system. In this study, basic methods which use the acoustic emission (AE) signals and sutting forces proposed to monitor tool wear (flank wear) quantitatively. Fist, in order to detect flank wear, it was investigated influence of cutting conditions, that is, cutting velocity, feed and depth of cut, on AE signals (AErems) and cutting forces. Furthermore,the relationship flank wear between AErems and cutting forces were discussed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.857-860
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• 1997

The purpose of this research was to study the influence of machining characteristics for aluminum alloys. The effect of metallic microstructural variables on the measures of machinability of aluminum alloys has no been adequately investigated. Machining Characteristics are influenced significantly by mechanical characteristics, composition and structure of material etcs. For improvement of machining characteristics, various studies are reported. In this paper, composition elements add to aluminum alloys within the limit of sustaining mechanical characteristics of metallic material. We have analyzed dynamic characteristics of cutting resistance, tensile strength value, hardness value etcs.