• 제목/요약/키워드: Surface roughness

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승용차 부품의 정면밀링가공시 공구마모 및 표면거칠기 특성에 관한 연구 (A Study on Characteristics of Tool Wear and Surface Roughness in Face Milling of Automobile Parts)

  • 김성일;오성훈;문상돈;김태영
    • 한국자동차공학회논문집
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    • 제4권5호
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    • pp.223-230
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    • 1996
  • The quality and productivity in machining automobile parts are influenced by various factors such as cutting conditions, vibration, and used tool. To improve the quality and productivity of the automobile parts(torsion beam), lots of research on the evaluation of tool life and control of surface roughness has been required. Therefore, the width of flank wear, cutting force, and surface roughness are monitored to analyse the characteristics of tool wear and surface roughness at different tools. This experimental investigation is mainly focused on the characteristics of the tool wear, tool life and surface roughness in multi-insert milling of automobile parts(torsion beam) by using uncoated tungsten carbide tool(WC), TiN coated tool, and cermet tool.

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AE 신호를 이용한 연삭 가공물의 표면 거칠기 예측 (Estimation of the Ground Surface Roughness Applied by Acoustic Emission Signal)

  • 곽재섭;송지복
    • 한국정밀공학회지
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    • 제17권4호
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    • pp.240-246
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    • 2000
  • An in-process estimation of the ground surface roughness is a bottle-neck and an essential field in conventional grinding operation. We defined the dimensionless average roughness factor (D.A.R.F) that exhibits a roughness characteristics of ground surface. The D.A.R.F was composed easily of the absolute average and the standard deviation values which were the analytic parameters of the acoustic emission (AE) signal generated during the machining process. The theoretical equation between the surface roughness and the D.A.R.F has been derived from the linear regressive analysis and verified its availability through the experimentation on the surface grinding machine.

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주축 런아웃이 절삭흔과 표면거칠기에 미치는 영향에 관한 연구 (A Study on the Spindle Run-out Effects on Cutter Mark and Surface Roughness)

  • 황영국;이춘만
    • 한국공작기계학회논문집
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    • 제16권2호
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    • pp.84-91
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    • 2007
  • The radial error motion of a machine tool cutter/spindle system is critical to the dimensional accuracy of the parts to be machined. This paper presents an investigation into spindle run-out effects on cutting mark and surface roughness. We experimented the effects of spindle run-out on surface roughness in flat-end milling by cutting AL 7075 workpiece in various cutting conditions. In order to analyze the effects of run-out on the surface roughness, the spindle's radial error motions was measured by mounting a sphere target onto the spindle as a reference. From the experimental results, it was found that spindle un-out makes a directive effects on surface roughness in flat-end milling.

SM45재의 선삭조건이 펴면거칠기에 미치는 영향 (The Effect of Various Cutting Conditions on the Surface Roughness of SM45C Materials)

  • 안영호;박창언;정영재;손준식
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.482-486
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    • 1995
  • Generally, a great deal of attention is given to the maintenance of consistent surface roughness. Therefore one of the major goals of research in this area has been the development of models which can predict the surface roughness obtainable on a machined metal part over the simultaneous variation of cutting condition. A comparison is also made between the theoretical and actual values of surface roughness to calculate the overall variance in the developed models, Mathematical models developed from the experimental data in the course of this work can be employed to control the cutting conditions in order to achieve the desired surface roughness and deep quality.

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Surface Roughness Effects on the Lubrication Characteristics of the Engine Piston Ring Pack

  • Yun, Jeong-Eui
    • KSTLE International Journal
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    • 제1권2호
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    • pp.83-90
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    • 2000
  • The surface roughness between a piston ring pack and a cylinder liner directly affects the fuel economy, the oil consumption, and the emission of the engine so that it is very important to clarify the surface roughness effects on the lubrication characteristics. The friction characteristics of the piston ring during engine operations are known to as mixed lubrication experimentally. In this study to simulate the effects of the surface roughness of the piston ring pack on the lubrication characteristics, the mixed lubrication analysis of piston rings was performed using the simplified average Reynolds equation. From the results the surface roughness was found be considerably affects minimum oil film thickness as well as FMEP(Friction Mean Effective Pressure). Especially, the oil ring was the most sensitive on the surface roughness.

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직교배열법에 의한 선삭가공시 표면거칠기 평가 (Surface roughness evaluation in turning by an orthogonal array method)

  • 배병중;박태준;양승한;이영문;김희술
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.862-865
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    • 2000
  • The object of this paper is to evaluate the surface roughness using the experimental equation of surface roughness, which is developed in turning by an orthogonal array method. $L_9{3^4}$ orthogonal array method, one of fractional factorial design has been used to study effects of main cutting parameters such as cutting speed, feed rate and depth of cut, on the surface roughness. And the analysis of variance (ANOVA)-test has been used to check the significance of cutting parameters. Using the result of ANOVA-test, the experimental equation of surface roughness, which consists of only significant cutting parameter - feed rate, has been developed. The coefficient of determination of this equation is 0.962.

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순수 티타늄 주조체의 주형온도에 따른 용탕반응성 및 표면거칠기 (Metal-Mold Reaction and Surface Roughness Measurement of Pure Titanium Casting Specimens with Mold Temperatures)

  • 차성수;송영주;박수철
    • 대한치과기공학회지
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    • 제32권4호
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    • pp.297-305
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    • 2010
  • Purpose: The purpose of this study was to observe the change of metal-mold reaction and surface roughness in titanium casting specimens for phosphate-silica alumina bonded investment with mold temperatures. Methods: The metal-phosphate silica alumina bonded mold interface reaction and surface roughness of titanium casting specimens according to mold temperatures were investigated. The Specimens were analysed by scanning electron microscopy and surface roughness tester. Results: The oxidation behavior indicated by the growth of oxide thickness. The titanium-oxide layer were consisted two layer of a porous external and a dense internal one. The reaction layer and surface roughness increased with increasing investment material temperature. Conclusion: In this work, The most suitable mold temperature in casting of pure titanium was $200^{\circ}C$.

쾌속조형 파라미터를 이용한 표면형상정밀도 향상에 관한 연구 (Study on the Roughness Improvement using Parameter of Rapid Prototyping)

  • 박재덕;김태호;전언찬
    • 한국기계가공학회지
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    • 제6권3호
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    • pp.77-84
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    • 2007
  • As a life cycle of product bas shortend, Rapid prototypiug has come into the spotlight to shortened the time of producint a prototype. But It followed in laminated directivity and of the prototype production which is decided the interference which Beccuase of invisible rough surface, some inferences have occured during an assembly hour. Consequently, This study on rapid prototyping has parameter to determine surface roughness and surface form precision of total shape. In order to improve Surface form precision, it can control parameters which are Laminate Height, Layer Hatch Overcue, Fill Cure Depth. In addition, we found the parameter which have a deep effect on surface roughness among various parameters, and then, tried to reduce the interference that can be occurred by surface roughness during assembly.

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고속 볼엔드밀가공에서 회전오차의 측정을 통한 표면거칠기 예측에 관한 연구 (Prediction of Surface Roughness through Measuring Runout in High-speed Ball-End Milling)

  • 김병국;이기용;김정석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.889-893
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    • 1997
  • In this study the runout of spindle is selected as a parameter through which we could measure the machinability of machine and the quality of products. We experimented the effects of runout on surface roughness in high-speed ball-end milling by cutting HP4M workpiece in various cutting condition. It was founs that sunout makes a directive effects on surface roughness and the frequensy type of runout is more or loss similar with that of surface roughness. So the predcition of surface roughness could be possible through measuring the spindle runout.

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비틀림 접착 조인트의 피로 수명에 대한 표면 조도와 접착 두께의 영향 (The Effects of Surface Roughness and Bond Thickness on the Fatigue Life of Adhesively Bonded Tubular Single Lap Joints)

  • 권재욱;이대길
    • 대한기계학회논문집A
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    • 제24권8호
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    • pp.2022-2031
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    • 2000
  • Since the surface roughness of adherends affects much the strength of adhesivelybonded joints, the effect of surface roughness on the fatigue life of adhesively bonded tubular single lap joints was investigated analytically and experimentally by fatigue torsion test. The stiffness of the interfacial layer between adherends and adhesive was modeled as a normal statistical distribution function of surface roughness of adherends. From the investigation, it was found that the optimum surface roughness of adherends for the fatigue strength of tubular single lap joints was dependent on bondthickness and applied load.