超音波振動付加による超耐熱合金の被削性向上と切削機構解明

Research Project

Project/Area Number	12650116
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	機械工作・生産工学
Research Institution	KYUSHU UNIVERSITY
Principal Investigator	ONIKURA Hiromichi Faculty of Engineering, KYUSHU UNIVERSITY, Prof., 大学院・工学研究院, 教授 (90108655)
Co-Investigator(Kenkyū-buntansha)	KATSUKI Akio Faculty of Engineering, KYUSHU UNIVERSITY, Res. Ass., 大学院・工学研究院, 助手 (20038095) OHNISHI Osamu Faculty of Engineering, KYUSHU UNIVERSITY, Ass. Prof., 大学院・工学研究院, 講師 (50315107)
Project Period (FY)	2000 – 2001
Project Status	Completed (Fiscal Year 2001)
Budget Amount *help	¥3,500,000 (Direct Cost: ¥3,500,000) Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000) Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
Keywords	Finish Turning / Super Heat-Resistant Alloy / Ultrasonic Vibration / Tool Wear / Surface Roughness / Coolant / Inconel 718 / Liquid Nitrogen / 仕上げ旋削 / 工具磨耗 / 超耐熱合金インコネル718 / 凝着 / 切削温度の低下 / 工具破損 / 工具台の剛性 / 振動方向
Research Abstract	Finish turning of super heat-resistant alloy, Inconel 718, was tried in order to improve the machinability, assisted by twist-type ultrasonic-vibration equipment. CBN tools and TiAIN coated carbide tools were used with the supply, of ecological coolant. Before the cutting experiment it is made clear that the holding stiffness of ultrasonic vibration equipment and the workpiece must be kept high to perform the stable cutting without chatter vibration. The cutting experiment shows the following; (1) Generally, the application of u1. vibration to the CBN tools results in the growth of groove wear and flank wear and the deterioration of roughness of finished surface. This may be caused by the repetition of workpiece adhesion and peeling, and the lack of toughness of CBN. (2) The supply of vegetable oil to CBN tools gives less toot wear than compressed air. (3) The supply of new fluorocarbon refrigerant to CBN tools without u1. vibration may prevent more work adhesion and end groove wear than compressed air. But, in the cape of new fluorocarbon refrigerant, the breakage of end flank sometimes happen. This must be avoided. (4) With u1. vibration the supply of liquid nitrogen shows small roughness of about 2 μm near the theoretical value after cutting length of 111 m. This result may be attributed to the low adhesion of workpiece resulting from low cutting temperature. Concerning this result, further investigation is needed