start-ver=1.4
cd-journal=joma
no-vol=91
cd-vols=
no-issue=946
article-no=
start-page=24-00128
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Development of a guideline proposal system for correcting cutting conditions based on the overhang length of ball end-mills
kn-title=ボールエンドミルの突き出し長さに応じた切削条件補正システムの開発
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In the field of die and mold machining, determining appropriate cutting conditions is crucial. Factors such as tool geometry, machining path, work material characteristics, machining efficiency, and finishing accuracy must be taken into consideration. However, the current method of determining cutting conditions relies heavily on the intuition and experience of skilled engineers, and there is a need for a system to replace such knowledge. One of the critical factors affecting machining accuracy and efficiency is the tool overhang length, which is directly related to tool geometry. Unfortunately, there is no clear guideline for its determination. In a previous study, researchers developed a system to quickly derive cutting conditions using a data mining method and Random Forest Regression (RFR) applied to a tool catalog database. In this study, we constructed a new cutting condition compensation system based on the existing model, which accounts for the tool overhang length. The results of cutting experiments under high aspect ratio overhang lengths confirm that the correction coefficients proposed by the system are significant.
en-copyright=
kn-copyright=

en-aut-name=KODAMAHiroyuki
en-aut-sei=KODAMA
en-aut-mei=Hiroyuki
kn-aut-name=児玉紘幸
kn-aut-sei=児玉
kn-aut-mei=紘幸
aut-affil-num=1
ORCID=

en-aut-name=MORIYAYuki
en-aut-sei=MORIYA
en-aut-mei=Yuki
kn-aut-name=守屋祐輝
kn-aut-sei=守屋
kn-aut-mei=祐輝
aut-affil-num=2
ORCID=

en-aut-name=MORIMOTOTatsuo
en-aut-sei=MORIMOTO
en-aut-mei=Tatsuo
kn-aut-name=盛元達雄
kn-aut-sei=盛元
kn-aut-mei=達雄
aut-affil-num=3
ORCID=

en-aut-name=OHASHIKazuhito
en-aut-sei=OHASHI
en-aut-mei=Kazuhito
kn-aut-name=大橋一仁
kn-aut-sei=大橋
kn-aut-mei=一仁
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学 学術研究院環境生命自然科学学域

affil-num=2
en-affil=Graduate school of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学 大学院環境生命自然科学研究科

affil-num=3
en-affil=Graduate school of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学 大学院環境生命自然科学研究科

affil-num=4
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学 学術研究院環境生命自然科学学域
en-keyword=Data mining
kn-keyword=Data mining
en-keyword=Cutting conditions
kn-keyword=Cutting conditions
en-keyword=Machine learning
kn-keyword=Machine learning
en-keyword=Random Forest Regression
kn-keyword=Random Forest Regression
en-keyword=Ball end-mill
kn-keyword=Ball end-mill
en-keyword=Tool overhang length
kn-keyword=Tool overhang length
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=3
article-no=
start-page=337
end-page=345
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250505
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Study on the Grinding Temperature of Workpiece in Side Plunge Grinding Process
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Grinding is used to finish thrust metal attachment parts, such as crankshafts, which have both journal and thrust surfaces. In side plunge grinding, a thrust surface and a cylindrical surface of a shaft workpiece with collars are finished in a single plunge grinding process. However, the surface quality near the ground internal corner, where grinding fluid may not penetrate, can deteriorate, causing high residual stress and cracks owing to grinding heat. While it has been reported that quality issues at the inner corners of the ground surface can be mitigated by reducing the grinding point temperature through efficient cooling fluid supply, the mechanisms of grinding phenomena and heat generation in side plunge grinding are not yet fully understood. In this study, the variations in the grinding temperature at the thrust surface of a workpiece with a collar were experimentally investigated using a wire/workpiece thermocouple to clarify these phenomena. The results revealed a significant increase in the grinding temperature at the corners of the grinding zone. However, it slightly decreases as the thermocouple output approaches the center of the workpiece, indicating a slight effect of the grinding speed. The surface temperature of the workpiece in side plunge grinding is primarily influenced by the wheel depth-of-cut in the thrust direction. Additionally, the effect of workpiece rotational speed and grinding infeed speed on temperature distribution has been demonstrated.
en-copyright=
kn-copyright=

en-aut-name=GaoLingxiao
en-aut-sei=Gao
en-aut-mei=Lingxiao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=KuidaMotoki
en-aut-sei=Kuida
en-aut-mei=Motoki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KodamaHiroyuki
en-aut-sei=Kodama
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=OhashiKazuhito
en-aut-sei=Ohashi
en-aut-mei=Kazuhito
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=
en-keyword=grinding
kn-keyword=grinding
en-keyword=thrust surface
kn-keyword=thrust surface
en-keyword=grinding temperature
kn-keyword=grinding temperature
en-keyword=thermocouple
kn-keyword=thermocouple
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=1
article-no=
start-page=JAMDSM0001
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Development of tool life prediction system for square end-mills based on database of servo motor current value
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Accurate prediction of tool life is crucial for reducing production costs and enhancing quality in the machining process. However, such predictions often rely on empirical knowledge, which may limit inexperienced engineers to reliably obtain accurate predictions. This study explores a method to predict the tool life of a cutting machine using servo motor current data collected during the initial stages of tool wear, which is a cost-effective approach. The LightGBM model was identified as suitable for predicting tool life from current data, given the challenges associated with predicting from the average variation of current values. By identifying and utilizing the top 50 features from the current data for prediction, the accuracy of tool life prediction in the early wear stage improved. As this prediction method was developed based on current data obtained during the very early wear stage in experiments with square end-mills, it was tested on extrapolated data using different end-mill diameters. The findings revealed average accuracy rates of 71.2% and 69.4% when using maximum machining time and maximum removal volume as thresholds, respectively.
en-copyright=
kn-copyright=

en-aut-name=KODAMAHiroyuki
en-aut-sei=KODAMA
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SUZUKIMakoto
en-aut-sei=SUZUKI
en-aut-mei=Makoto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=OHASHIKazuhito
en-aut-sei=OHASHI
en-aut-mei=Kazuhito
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate school of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=
en-keyword=Milling
kn-keyword=Milling
en-keyword=LightGBM
kn-keyword=LightGBM
en-keyword=Tool life prediction
kn-keyword=Tool life prediction
en-keyword=Square end-mill
kn-keyword=Square end-mill
en-keyword=Servo motor current
kn-keyword=Servo motor current
END

start-ver=1.4
cd-journal=joma
no-vol=17
cd-vols=
no-issue=5
article-no=
start-page=434
end-page=448
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2023
dt-pub=20230905
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effect of Vibration Behavior in Low-Frequency Vibration Cutting on Surface Properties of Workpiece
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=　The objective of this study was to determine the effect of vibration behavior on workpiece surface properties in low-frequency vibration cutting. The effects of the parameters that determine vibration behavior on surface roughness were quantitatively evaluated through a comparison with other cutting conditions. Furthermore, by clarifying how the surface properties of the workpiece, such as roughness, roundness, and cross-sectional curves, change depending on the vibration behavior, a search for optimal conditions for low-frequency vibration cutting was conducted. The best surface properties were obtained under the condition of spindle rotation per vibration E=4.5. By using a value close to the minimum possible spindle rotation R=0.5 when the workpiece is retracted, it is expected to be effective in suppressing the variation in surface roughness at each phase angle; this variation is characteristic of low-frequency vibration cutting. Workpieces machined under low-frequency vibration conditions such as (E=2.5, R=1.0) and (E=3.5, R=1.0) were found to form characteristic surface patterns on the workpiece surface owing to a phenomenon in which the depth of the cut to the workpiece changes.
en-copyright=
kn-copyright=

en-aut-name=KodamaHiroyuki
en-aut-sei=Kodama
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MatsunoShota
en-aut-sei=Matsuno
en-aut-mei=Shota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=ShibataNaoyuki
en-aut-sei=Shibata
en-aut-mei=Naoyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=OhashiKazuhito
en-aut-sei=Ohashi
en-aut-mei=Kazuhito
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Okayama University
kn-affil=

affil-num=2
en-affil=Okayama University
kn-affil=

affil-num=3
en-affil=Okayama University
kn-affil=

affil-num=4
en-affil=Okayama University
kn-affil=
en-keyword=low-frequency vibration cutting
kn-keyword=low-frequency vibration cutting
en-keyword=vibration behavior
kn-keyword=vibration behavior
en-keyword=surface roughness
kn-keyword=surface roughness
en-keyword=cross-sectional curve
kn-keyword=cross-sectional curve
END

start-ver=1.4
cd-journal=joma
no-vol=65
cd-vols=
no-issue=
article-no=
start-page=53
end-page=63
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=202009
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Thermal influence on surface layer of carbon fiber reinforced plastic (CFRP) in grinding
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this study, we investigated thermal influence on surface layer of CFRP in grinding with heat conduction analysis using grinding temperature at wheel contact area on dry and wet condition. Moreover, the thermal affected layer was analyzed through an experiment to examine the temperature of glass transition and thermal decomposition of the matrix resin that composes the CFRP used in this study. The influence of thermal effect on grinding of CFRP was verified based on observation of ground surface finish after grinding using SEM and the measurement of surface roughness. From the measurement result of DSC (Differential Scanning Calorimetry)，TG-DTA (Thermogravimetry-Differential Thermal Analysis), It was found that the thermal affected layer of CFRP includes a layer in which the matrix resin is changed in quality by exceeding the glass transition temperature and a layer in which the matrix resin is thermally decomposed by exceeding the thermal decomposition temperature. In addition, it was found that the surface roughness was significantly reduced if the thermal affected layer with thermal decomposition was generated. In each grinding atmosphere, it tended to increase of grinding temperature at wheel contact area with increasing in the setting depth of cut. In the case of dry grinding, grinding temperature at wheel contact area increased up to t thermal decomposition temperature of the matrix resin. However, in the case of the wet grinding, grinding temperature at wheel contact area did not increase until thermally decomposition temperature. From the result of simulation about thermal affected layer, influence of grinding heat increased with increasing in the setting depth of cut. Ultimately, the thermal affected layer with thermal decomposition was generated in dry grinding. Moreover, from the results of SEM observation, it was confirmed that the surface finish properties deteriorated significantly due to thermal decomposition of the matrix resin in the case of Δ = 400 μm in the setting depth of cut at fiber angle θ = 0°. On the other hand, it was confirmed that the micro damage of carbon fiber was occurred in wet grinding at each setting depth of cut.
en-copyright=
kn-copyright=

en-aut-name=KodamaHiroyuki
en-aut-sei=Kodama
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=OkazakiShingo
en-aut-sei=Okazaki
en-aut-mei=Shingo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=JiangYifan
en-aut-sei=Jiang
en-aut-mei=Yifan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=YodenHiroyuki
en-aut-sei=Yoden
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=OhashiKazuhito
en-aut-sei=Ohashi
en-aut-mei=Kazuhito
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Okayama University
kn-affil=

affil-num=2
en-affil=Okayama University
kn-affil=

affil-num=3
en-affil=Okayama University
kn-affil=

affil-num=4
en-affil=Industrial Technology Research Institute of Okayama Prefectural Government
kn-affil=

affil-num=5
en-affil=Okayama University
kn-affil=
en-keyword=Carbon fiber reinforced plastic (CFRP)
kn-keyword=Carbon fiber reinforced plastic (CFRP)
en-keyword=Grinding
kn-keyword=Grinding
en-keyword=Grinding heat
kn-keyword=Grinding heat
en-keyword=Heat-affected layer
kn-keyword=Heat-affected layer
en-keyword=Heat condition analysis
kn-keyword=Heat condition analysis
END