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A High Precision Servomechanism of a Constant Speed for NC Machines

数控机床高精度恒速伺服机构

基本信息

批准号：
63550177
负责人：
EMURA Takashi
金额：
$ 1.28万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550177/
关键词：
Direct-Drive Phase-Locked-Loop PLL Servomechanism Gear Finisher Gear Hobber NC Machines Mechatronics サーボ機構 NC 数値制御ダイレクトドライブ

项目摘要

The NC machine is useful for mass production. In particular, it is suitable for producing a complex machine element. However, the NC machine is not suitable for making a special component such as gears. For example, until several years ago, it had been unable to get high precision gears by NC cutting or NC grinding process. It is because a high precisely synchronized servomechanisms are required for NC gear process.T. Emura of the head of this research project developed a very high precision servomechanism about ten years ago, and he tried to apply his servomechanism to gear cutting machines of NC type. Then he succeeded in cutting high precision gears by a NC hobber.This research work is carried out in order to increase cutting or grinding speed by means of a direct-drive technique. Since the equivalent moment of inertia of the direct-drive servomechanism is extremely small, an inertial damper was used and the position loop-gain of the servomechanism was increased sufficiently in order to decrease the rotary vibration of a servo- spindle. Moreover the authors applied a new PLL developed by T. Emura to their high speed servo-spindle. After experiments, they succeeded in rotating their spindle at a speed of 4,000rpm and with the accuracy of 20"pp. These speed and accuracy are high enough for NC gear hobbers and NC gear grinders.

数控机床对于批量生产很有用。特别适合生产复杂的机械元件。然而，数控机床不适合制造齿轮等特殊零件。例如，直到几年前，还无法通过数控切削或数控磨削工艺获得高精度齿轮。这是因为数控齿轮加工需要高精度同步伺服机构。该研究项目的负责人江村大约十年前开发了一种非常高精度的伺服机构，并尝试将其伺服机构应用于数控型齿轮切削机床。随后，他成功地用数控滚齿机切削了高精度齿轮。这项研究工作是为了通过直接驱动技术提高切削或磨削速度。由于直驱伺服机构的等效转动惯量极小，因此采用惯性阻尼器并充分增大伺服机构的位置环增益，以减小伺服主轴的旋转振动。此外，作者将 T. Emura 开发的新型 PLL 应用于他们的高速伺服主轴。经过实验，他们成功地使主轴以4,000rpm的速度旋转，精度达到20"pp。这样的速度和精度对于数控滚齿机和数控磨齿机来说已经足够高了。