• Title, Summary, Keyword: Feed per Tooth

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Effects of Cutting Speed and Feed Rate on Axial Shape in Side Walls Generated by Flat End-milling Process (평엔드밀링 공정에서 절삭속도 및 이송속도가 측벽의 축방향 형상에 미치는 영향)

  • Kim, Kang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.5
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    • pp.391-399
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    • 2017
  • This paper presents the effects of the cutting speed and feed rate on the axial shape of flat end-milled down cut side walls. Experiments were performed using the cutting speed, tool diameter, and feed per tooth as variables, and the thrust force and axial shape were measured as the experimental results. The results of this study confirmed that a smaller feed per tooth, which is proportional to the value obtained by dividing the feed rate by the cutting speed, results in a higher axial shape accuracy. In addition, the axial shape can be simplified to a form in which two straight lines having different slopes meet at a singular point. Therefore, it was concluded that the shape accuracy could easily be estimated during the operation and improved by adjusting the feed per tooth.

Effect of Material Removal per Tooth on the Axial Shape of Prismatically Milled Parts (공구날당 소재제거량이 각주형상 밀링가공물의 축방향 형상에 미치는 영향)

  • Kim Kwang Hee
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.6
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    • pp.17-22
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    • 2004
  • A study for investigating the effects of the cutting conditions (radial depth of cut feed per tooth) and the number of tooth on the side wall of prismatically milled workpiece is described. This study is available not only for understanding the geometrical characteristics of the end milled side wall but also for finding the optimal cutting conditions. In this work, the side wall geometry was characterized by the straightness and the location of maximum peak point. Through this study, it was revealed that the geometrical characteristics of the end milled side wall are strongly related to the material removal per tooth and the number of tooth.

Efffct of Material Removal per Tooth on the Circumferential Shape of Cylindrically Milled Parts (공구날당 소재제거량이 원통형 밀링가공물의 원주형상에 미치는 영향)

  • Kim Kwang Hee
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.5
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    • pp.62-66
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    • 2004
  • A study for investigating the effects of the cutting conditions(feed rate, radial depth of cut, cutting speed) and the tool diameter on the circumferential geometry of the cyl indrically end-mi1led workpiece is described. In this work, the circumferential geometry is characterized by the roundness error. Experimental results show that the circumferential geometry is directly affected by the material removal per tooth,which is defined as a function of the cutting speed, the feed rate and the radial depth of cut. And, the radial depth of cut is revealed to be the most critical condition among them. It is also found that the roundness error decreases when the tool diameter is larger under the same cutting conditions.

Chip Load Control Using A NC Verification Model Based on Z-Map (Z-map 기반 NC 검증모델을 이용한 칩부하 제어)

  • 백대균;고태조;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.801-805
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    • 2000
  • This paper presents a new method of tool path optimization. A NC verification model based Z-map was utilized to obtain chip load in feed per tooth. This developed software can regenerate a NC program from cutting condition and the NC program that was generated in CAM. The regenerated NC program has not only all same data of the ex-NC program but also the new feed rates in every block. The new NC data can reduce the cutting time and manufacture precision dies with the same chip load in feed per tooth. This method can also prevent tool chipping and make constant tool wear. This paper considered the effects of acceleration and deceleration in feed rate change.

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Chip Load Control Using a NC Verification Model Based on Z-Map (Z-map 기반 가공 검증모델을 이용한 칩부하 제어기)

  • Baek Dae Kyun;Ko Tae Jo;Park Jung Whan;Kim Hee Sool
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.4
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    • pp.68-75
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    • 2005
  • This paper presents a new method for the optimization of feed rate in sculptured surface machining. A NC verification model based on Z-map was utilized to obtain chip load according to feed per tooth. This optimization method can regenerate a new NC program with respect to the commanded cutting conditions and the NC program that was generated from CAM system. The regenerated NC program has not only the same data of the ex-NC program but also the updated feed rate in every block. The new NC data can reduce the cutting time and produce precision products with almost even chip load to the feed per tooth. This method can also reduce tool chipping and make constant tool wear.

An Evaluation of Machining Characteristics in Micro-scale Milling Process by Finite Element Analysis and Machining Experiment (유한요소해석과 가공실험을 통한 마이크로 밀링가공의 가공특성평가)

  • Ku, Min-Su;Kim, Jeong-Suk;Kim, Pyeoung-Ho;Park, Jin-Hyo;Kang, Ik-Soo
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.1
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    • pp.101-107
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    • 2011
  • Analytical solution of micro-scale milling process is presented in order to suggest available machining conditions. The size effect should be considered to determine cutting characteristics in micro-scale cutting. The feed per tooth is the most dominant cutting parameter related to the size effect in micro-scale milling process. In order to determine the feed per tooth at which chips can be formed, the finite element method is used. The finite element method is employed by utilizing the Johnson-Cook (JC) model as a constitutive model of work material flow stress. Machining experiments are performed to validate the simulation results by using a micro-machining stage. The validation is conducted by observing cutting force signals from a cutting tool and the conditions of the machined surface of the workpiece.

On-line Estimation of Radial Immersion Ratio in Face Milling Using Cutting Force (정면 밀링에서 절삭력을 이용한 반경 방향 절입비의 실시간 추정)

  • Hwang, Ji-Hong;O, Yeong-Tak;Gwon, Won-Tae;Ju, Jong-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.8
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    • pp.178-185
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    • 1999
  • In tool condition monitoring systems, parameters should be set to a certain threshold. In many cases, however, the threshold is dependent on cutting conditions, especially the radial immersion ratio. In this presented is a method of on-line estimation of the radial immersion ratio in face milling. When a tooth finishes sweeping, a sudden drop of cutting force occurs. The force drop is equal to the cutting force that acting on a tooth at the swept angle of cut and can be acquired from cutting force signals in feed and cross-feed directions. Average cutting force per tooth period can also be calculated from cutting force signals in two directions. The ratio to cutting forces in two directions acting on a tooth at a certain swept angle of cut and the ratio of average cutting forces in two directions per tooth period are functions of the swept angle of cut and the ratio of radial to tangential cutting forces. Using these parameters, the radial immersion ratio is estimated. Various experiments are performed to verify the proposed method. The results show that the radial immersion ratio can be estimated by this method regardless of other cutting conditions.

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Feedrate Scheduling for High Speed Machining Based on an Improved Cutting Force Model (향상된 절삭력 모델을 이용한 고속 가공의 이송속도 스케줄링)

  • 이한울;고정훈;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.141-144
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    • 2003
  • This paper proposes an analytical model of off-line feed rate scheduling to obtain an optimum feed rate for high speed machining. Off-line feed rate scheduling is presented as an advanced technology to regulate cutting forces through change of feed per tooth, which directly affects variation of uncut chip thickness. In this paper, the feed rate scheduling model was developed using a mechanistic cutting force model using cutting-condition-independent coefficients. First, it was verified that cutting force coefficients are not changed with respect to cutting speed. Thus, the feed rate scheduling model using the cutting-condition-independent coefficients can be applied to set the proper feed rates for high speed machining as well as normal machining. Experimental results show that the developed fred rate scheduling model makes it possible to maintain the cutting force at a desired level during high speed machining.

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High Speed Machining Considering Efficient Manual Finishing Part II: Optimal Manual Finishing Process and Machining Condition (고속 가공을 이용한 금형의 효율적 생산 제 2 부: 사상 공정 및 가공 조건의 선정)

  • Kim, Min-Tae;Je, Sung-Uk;Lee, Hae-Sung;Chu, Chong-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.12
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    • pp.38-45
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    • 2006
  • In this work, optimal finish machining condition considering total time for mold or electrode manufacturing was investigated. First, manual finishing time according to the machining condition was analyzed for the work material. The effect of runout and phase shift of tool path on surface finish was also considered in those analyses. Secondly, optimal manual finishing processes were determined for various machining conditions. Finally, finish machining time and corresponding manual finishing time were taken into account for the estimation of the total time of manufacturing mold. Though small feed per tooth and pick feed reduced the manual finishing time, the finish machining time increased in such conditions. With a machining condition of feed per tooth of 0.2 mm and pick feed of 0.3 mm, the minimum total time of manufacturing mold was achieved in our machining condition.

Characteristic evaluation of microscopic precision in high speed machining (고속가공에서 미시적 정밀도의 특성 평가)

  • 김철희;김전하;강명창;김정석
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.352-357
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    • 2001
  • In this study, residual stress was investigated to evaluate damaged layer in high speed machining through simulation. In machining steel(STDll), residual stress remaining in machined surface was mainly appeared as compressive stress. The scale of this damaged layer more depends on feed per tooth and radial depth than spindle speed. Damaged layer was measured by optical microscope and hardness method. The micro-structure of damaged layer was a martensite because of cutting force and cutting temperature. Thickness of damaged layer is increased with incresing of feed per tooth and radial depth.

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