| Budget Amount *help |
¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
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| Outline of Final Research Achievements |
This study discusses the cutting process in orbital drilling of CFRP/Ti alloy stacks. The cutting force is predicted in a force model based on the minimum cutting energy.
The hardness inside of the machined hole increases with improvement of the surface finish in orbital drilling using barrel tools. The orbital drilling operation should be divided into roughing and finishing processes in drilling of large diameter holes in terms of machining stability. The tool damage is controlled with improvement of the chip evacuation. Regarding the machining accuracy, the holes are drilled with roundness, cylindricity and coaxiality of less than 10 um; and finished with compressive residual stresses of larger than 300 MPa in orbital drilling with the barrel tools. The orbital drilling in the finishing process is effective in fatigue life in terms of residual stress and hardness.
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