• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.11
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• pp.4726-4731
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• 2011

This paper proposed the algorithm to select optimal grinding condition for plunge grinding in the batch production unit. In order to apply to the proposed algorithm, the state variable for plunge grinding process was defined and the optimal grinding condition for each cycle in batch production was decided by genetic algorithm. Based on the optimized grinding condition in each cycle, the optimal grinding condition for whole batch production was selected by dynamic programming. The proposed algorithm was evaluated by computer simulation.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.15 no.1
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• pp.68-73
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• 2016

In this paper, the grinding characteristics in internal grinding methods(plunge, thrust) were studied with vitreous CBN wheels using machining center. Grinding experiments were performed according to the same material removal rate conditions such as a wheel speed, depth of cut and workpiece speed. And the grinding force, machining error and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics on internal grinding methods were compared.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.23 no.6 s.165
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• pp.881-894
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• 1999

Cylindrical plunge grinding is widely used for final machining process of precision parts such as automobile, aircraft, measurement units. But in order to make parts which have high precision accuracy and high surface integrity, it is necessary to consider grinding characteristics due to accumulation phenomena of grinding wheel in plunge grinding process. In this study, in order to examine closely plunge grinding process, grinding power, grinding force, real depth of cut are monitored in transient state, steady state and spark out state. As the result, it is shown that grinding power and force are affected by dressing condition, depth of cut and speed ratio and that there exist threshold grinding force and it also affected by dressing condition. Also considered effects of grinding conditions on surface roughness and roundness of workpiece

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.1047-1050
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• 2002

In this paper, grinding characteristics of cylindrical plunge grinding in 200m/sec of grinding velocity was investigated by use of vitrified CBN wheel. From the experimental result, it was convinced that grinding power is decreased 2.5times and grinding efficiency is heightened 3times more according to increasing wheel velocity 80m/sec to 200m/sec And also, be expected to improvement of surface roughness and roundness by increasing the wheel velocity.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.54-59
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• 1999

High precision internal plunge grinding is difficult because of the decrease in the quill stiffness due to the small diameter of wheel. In this paper, the characteristics of internal plunge grinding were investigated. Grinding experiments were performed at various grinding conditions with vitrified bonded CBN wheels. The grinding period was assumed to be consisted of rough grinding and fine grinding. The classification of grinding was determined int terms of the normal grinding forces and actual depth of cut. The experimental results indicate that the higher depth of cut and infeed speed result in the longer rough grinding time. The maximum normal grinding force was nearly equal to the static force and it decreases exponentially as the grinding continues.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.126-130
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• 1992

본 연구에서는 평면 연삭반에서 연삭조건을 다양하게 변화시키면서 레진본드계 다이아몬드 숫돌을 이용한 기계구조용 세라믹스의 연삭가공 특성을 제시하기 위한 실험을 하였다. 본 연구에서는 고경도 기계구조용 세라믹스로서 대표적인 질화규소, 탄화규소, 알루미나를 선택하여 평형 연삭숫돌을 이용한 플런지 평면연삭 및 트레버스 평면연삭의 실험을 수행하였다. 각 연삭조건에 따른 표면거칠기와 연삭저항, 연삭동력등을 측정하여 가공범위를 설정하고자 하였다. 한편, 이와 같은 실험을 통하여 고품위의 가공면을 구하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.961-964
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• 1997

In this paper, grinding characteristics of ultra high speed cylindrical plunge grinding was investigated by use of vitrified CBN wheel. From the experimental result, it was convinced that grinding power is decreased according to the increase of wheel and workpiece speed due to changing of grinding mechanism which decreases depth of cut and length of contact curve according to increment of wheel speed. And also, stock removal reduction of each gram lead to improvement of surface roughness by increasing the wheel speed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.62-67
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• 2011

Grinding process is executed in the final machining stage to meet the quality requirements. In generally the ground surface of workpiece is affected by dressing condition as well as grinding condition. In order to estimate the roughness of workpiece, the several roughness models have been researched. These models defined the specific parameters and considered the several parameters which affect to roughness as multiply relationship among them. However, the multiply relationship among parameters is not enough to show the complicated grinding mechanism. Therefore, the neural network algorithm is used in this paper to predict the ground roughness for the plunge grinding. The proposed structure is composed of the initial roughness as well as final roughness model. The input parameters of proposed neural network are referred with the existing roughness model's. The performance of the proposed model is verified through experiments.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.6 no.1
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• pp.34-44
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• 1997

This study presents the recursive constraint bounding(RCB) method to reduce the cycle time in internal cylindrical plunge grinding process. This method can cope with process noise as well as modeling bias. The main features of RCB method are its utilization of measurements at the end of each cycle and its use of monotonicity analysis for determining the extremes of bias and noise. This method is investigated in simulation and evaluated by experiment in internal cylindrical plunge grinding operation. The results from simulation and experiment show that it is effective in reducing cycle time in spite of modeling uncertainty in the forms of process noise and modeling bias.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.5
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• pp.443-448
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• 2009

The roughness models have developed to describe the grinding behaviour and predict the final quality of workpiece. The model forms of the plunge grinding process are generally established with initial and steady state model form in accordance with the accumulated metal removal. The steady state roughness model form are based on the grinding condition and specific parameters are used to show the influence of it according to the grinding process such as the equivalent chip thickness and accumulated metal removal. However, the models have been developed in past are not considered the effect of changing the grinding conditions in the same batch. In this paper, the roughness model form to consider the effect of changing grinding condition is proposed and the performance of proposed model is evaluated based on the experimental results.