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티타늄 황삭가공에 있어서 공구형상이 공구마모율에 미치는 영향에 관한 연구
A Study on Effect of Tool Wear Rate upon Cutting Tool Shape in a Titanium Rough Cut Machining 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.10, 2019년, pp.27 - 33  

정화 (한국폴리텍대학 항공캠퍼스 항공기계과)

Abstract AI-Helper 아이콘AI-Helper

The aviation industry has grown beyond the simple processing and assembling of aircraft parts and now designs and exports finished aircraft. In this study, the vertical CNC milling rotational speed and feed rate were parameters to investigate the life of tools according to their shape: (flat, round,...

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제안 방법

  • Table 7 gives the cutting machining conditions. For cutting the tool shapes used in the experiment, the wet cutting was conducted using plane, round, and ball end-mills under the following conditions: spindle RPM from 1,000 to 1,600 with increments of 200 RPM and feed rates from 60 to 120 mm/min with increments of 20 mm/min.
  • In this study, the cutting temperature generated during the cutting process and tool weights before and after cutting a specimen were compared to measure the tool wear with parameters for RPM and feed rate of the cutting tool to determine the life of the cutting tool according to tool shape (plane, round, or ball end-mill) for the rough machining of titanium. The main comparison results are as follows:
  • The CNC milling apparatus used in this study was designed for vertical 3-axis high-speed cutting (D Company, Korea): its maximum spindle RPM is 12,000 and the maximum feed rate at the X and Y axes is 12,000 mm/min. Table 1 reports the main specifications of the CNC milling apparatus.
  • The cutting of aircraft parts is divided into two processes: rough machining for shaping while leaving the cut allowance and finishing to improve the shape dimensions, surface roughness, and geometric tolerance of the product.The aim of the study is to determine the maximum time that plane, round, and ball end-mills can be used when performing rough machining of titanium by measuring the cutting temperature generated during the cutting process with parameters for spindle revolutions per minute (RPM) and the feed rate of vertical computer numerical control (CNC) milling. The weight of the tool was measured before and after specimen cutting to calculate the tool wear rate followed by an investigation of tool lifetime through a comparison with the results of a previous study[1] .
  • The specimen was machined into a cube shape (400 × 400 × 400 mm) and a CNC milling NC program was generated using the CATIA program for cutting according to the tool shape for 60 min in the cutting experiment.

대상 데이터

  • The heat measurement generated in the specimen and tool during cutting was conducted by mounting a portable infrared thermometer to the CNC milling spindle using a magnet. The focus of the thermometer was aimed at 300 mm away from the edge of the end-mill. Table 8 reports the main specifications of the portable infrared thermometer.
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참고문헌 (4)

  1. Bae, M. W, Park, H. Y and Jung, H., "Study on Wear Characteristics of Cutting Tools in a Titanium Roughing Cut Machining," Transactions of the KSAE, Vol.24, No.1, pp.67-73, 2016. 

  2. Park, H. Y., Bae, M. W., Jung, H., Kang, M. S., "Effect of Cooling Method on Surface Roughness in High-speed Machining," 2010 KSAE Annual Conference and Exhibition, pp.2679-2684, 2010. 

  3. Park, H. Y., Bae, M. W. and Jung, H., "Effect of Cutting Depth on Surface Roughness of Al Alloy 7075 in High-speed Machining," 2011 KSAE Annual Conference and Exhibition, pp.2442-2446, 2011. 

  4. Bae, M. W., Park, H. Y. and Jung, H., "A Study on the Optimal Cutting Depth upon Surface Roughness of Al Alloy 7075 in High-speed Machining," Transactions of the KSAE, Vol.21, No.5, pp.74-81, 2013. 

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