[논문]머시닝센터 평면가공 시 가공횟수에 따른 치수정밀도 특성에 관한 연구

양용모

doi:10.14775/ksmpe.2018.17.6.061

[국내논문] 머시닝센터 평면가공 시 가공횟수에 따른 치수정밀도 특성에 관한 연구
A Study on Characteristics of Dimensional Accuracy using Planning Number of Machining in Machining Center 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.17 no.6, 2018년, pp.61 - 67

양용모 (한국폴리텍대학 동부산캠퍼스 컴퓨터응용기계과)

Abstract ▼ AI-Helper

The face milling cutter, which is mainly used for the face milling, is used to cut the Carbon steel(SM20C) in the machining center for 5 times and 10 times respectively. This study clarify the dimensional accuracy characteristics according to the number of fine machining varied the condition of cutting depth, table feed speed and spindle speed. Cutting depth is varied 0.05~0.2mm, table feed speed is varied 0.05~0.2mm/min and spindle speed is varied 1500~2500rpm. As a result, the dimensional accuracy was stable 6 times machining with table feed speed 150mm/min and 10 times machining with table speed 100mm/min and cutting depth 0.05mm regardless times of machining.

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가설 설정

3. The measurements were good and stable at a 0.05-mm cutting depth during straight cutting using the face-milling cutter, regardless of the number of machining times.

제안 방법

Cutting oil was not used in all cases. Tests were conducted with down cut milling to identify how the number of cutting machining processes affected the measurements. These occurred after the machining program was added to the machining center input device under the following cutting conditions: a principle spindle speed of 1,500 to 2,500 rpm, cutting depth of 0.
The experiment was conducted to verify the effects that several factors have on dimensional change, including changes in cutting conditions and the number of cutting procedures. To do this, the experiment device presented in Table 1 was utilized.
3 shows the specimen measurement location utilizing the coordinate measuring machine. The measurements were derived by selecting 6.5 mm in the right and left directions from the center based on a 20 mm-wide specimen (Y-axis) and a 20-mm distance on the machining side (X-axis) using the ball probe (measuring unit).
Thus, this study aims to apply dimension change characteristics according to the number of machining processes during finishing while cutting and machining carbon steel (SM20C) for a machine structure. A face-milling cutter is used in the machining center five times and 10 times separately, and the conditions are changed variably as follows: cutting depth from 0.
To minimize the effect of dimensional change according to the tool's degree of wear, the cutting tool was replaced whenever principle spindle speed, cutting depth, and table feed rate were changed.
To observe the effects of changes in principle spindle speed and table feed rate, measurements were taken with the coordinate measuring machine throughout 10 machining iterations while changing cutting depth from 0.05 to 0.2 mm, principle spindle speed from 1,500 to 2,500 rpm, and table feed rate from 100 to 200 mm/min. The changes are depicted in Fig.
To observe the effects of changes in principle spindle speed and table feed rate, the coordinate measuring machine took five sets of measurements of machining iterations while changing the cutting depth from 0.05 to 0.2 mm, principle spindle speed from 1,500 to 2,500 rpm, and table feed rate from 100 to 200 mm/min. The changes are depicted in Fig.
Using a face-milling cutter in a machining center, this paper analyzed and discussed the effect of changing machining conditions on measurements, and it assessed this according to changes in the number of iterative cutting processes.

대상 데이터

Machine structural carbon steel (SM20C) with dimensions of 70 × 70 × 20 mm was used as the specimen in this experiment.
The SPKN1203 EDR carbide tool, which is widely used in production sites, was employed as the cutting tool in this study, and FEM65A ST32– was used as the tool holder.

성능/효과

1. When the cutting depth was shallow, tool wear progressed slowly due to small interference from chip flow, and changes in dimension precision values were minimal despite the increase in machining times. As the cutting depth became deeper, tool wear progressed rapidly due to chip flow interference with the cutting, thereby increasing changes in the measurements.
2. The dimension precision showed stable and good measurements for five cutting machining iterations and a 150-mm/min table feed rate, and it also showed good measurements for 10 cutting machining iterations and a 100-mm/min table feed rate.

참고문헌 (11)

Seo, S. W., Kim, D. H., Kim, S. Jin., "A Study on the Linear Compensation Method of Ideal Surface Roughness to Actual Roughness in Milling", Journal of the Korean society of machine tool engineers, Vol. 15, No. 3, pp. 15-20, 2017.
Jang S. M., Baek, S. Y., "A Study on the Analysis of Tool-wear Patterns and Mechanisms in Face Milling" ournal of the Korean society of machine tool engineers, Vol. 16, No. 4, pp. 24-29, 1998.
Yoon, J. H., Lee, J. W., Jung, K. Y. Jung, M. S., "Cutting Condition for Improving Cutting Efficiency and Accuracy by Ball Endmill on a Machining Center",Journal of the Korean society of machine tool engineers", Vol. 7, No. 3, pp. 99-103, 1998.
Park, J. N., Cho, G. J. and Lee, S. C. "A Study on the Cutting Characteristics of Ti-6Al-4V Alloy in Turning Operation", Journal of the Korean Society of Manufacturing Technology, Vol. 3, No. 4, pp. 81-87, 2004.
Seong, C. H., Kim, H. C. and Kim, K. S., "Characteristics of Surface Roughness in the High Speed Micro Turning of Aluminum Alloy", Journal of the Korean Society of Precision Engineering, Vol. 16, No. 7, pp. 94-100, 1999.
Jun, J. U., Chung, J. S. and Ha, M. K., "Analysis of Cutting Specific in Non-ferrous Metal by Changed rake-angle and feed-rate adjustment at Turning", Journal of the Korean society of machine tool engineers, Vol. 10, No. 4, pp. 1-6, 2001.
Choi, J. G., Kim, H. S. and Kim, S. C. "A Study on the Optimum Finish Allowance for Machining Accuracy Improvement in the End Milling Processes", Journal of the Korean society of machine tool engineers, Vol. 13, No. 3, pp. 8-14, 2004.
Chung, M. S., "A Study on Transition of Dimension Error and Surface Precision in High Speed Machining of AI-alloy", Vol. 9, No. 3, pp. 96-102, 2000.
Yoon, J. H., Seo, S. W. and Lee, H. C., "A Study on the Effect of Dimensional Errors and Roundness in High Speed Cylindrical Machining of Al-alloy" Journal of the Korean society of machine tool engineers Vol. 10, No. 5, pp. 17-27, 2001.
Jung, P. G., Bae, G. H. and Hong, S. W., "A Study on the Performance of Atomic Force Probe for coordinate Measuring Machines", Journal of the Korean society of machine tool engineers, Vol. 17, No. 1, pp. 75-80, 2008.
Lee, D. J. and Kim, H. J., "3D precision coordinate measurement technology and trend", Journal of the Korean society of machine tool engineers, Vol. 11, No. 2, pp. 7-14, 2002.

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[국내논문] 머시닝센터 평면가공 시 가공횟수에 따른 치수정밀도 특성에 관한 연구
A Study on Characteristics of Dimensional Accuracy using Planning Number of Machining in Machining Center 원문보기

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[국내논문] 머시닝센터 평면가공 시 가공횟수에 따른 치수정밀도 특성에 관한 연구 A Study on Characteristics of Dimensional Accuracy using Planning Number of Machining in Machining Center 원문보기

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[국내논문] 머시닝센터 평면가공 시 가공횟수에 따른 치수정밀도 특성에 관한 연구
A Study on Characteristics of Dimensional Accuracy using Planning Number of Machining in Machining Center 원문보기

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