著者

楠山 純平 小松 奏絵 橋本 匠海 棚田 耀介 中尾 陽一

出版者

公益社団法人 砥粒加工学会

雑誌

砥粒加工学会誌 (ISSN:09142703)

巻号頁・発行日

vol.64, no.5, pp.254-259, 2020-05-01 (Released:2020-12-17)

参考文献数

13

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マシニングセンタや複合加工機の場合,工具交換機能を有しており,工具の種類や工具径を変えながら加工が進められるため,主軸回転数も頻繁に変化させることになる.その結果,主軸回転数によってモ-タ発熱量や熱変形特性は変化する.したがって,スピンドルの発熱特性を把握して,適切な冷却構造をスピンドルに具備させたうえ,適切な冷却条件で冷却を行うことによって,高い加工精度を実現することが望まれる.とくに,最近,主流になっているビルトインモ-タスピンドルについては,モ-タの発熱がスピンドルの発熱や熱変形に直接影響する.本報では,開発した冷却構造を備えたビルトインモ-タスピンドルに対して,実験では測定が困難なスピンドル内部の温度変化と温度分布を熱解析シミュレ-ションにより検証した.さらに,水を冷却流体として供給し,スピンドルの回転数の違いによる温度変化,各冷却条件における冷却効果を実験的に明らかにし,シミュレ-ションとの比較を行った.

著者

林 晃生 中尾 陽一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.856, pp.17-00268-17-00268, 2017 (Released:2017-12-25)

参考文献数

14

被引用文献数

1

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Recently, the ultra-precision parts have become essential in many areas of advanced technology, including medical equipment, aircraft equipment, optical equipment and so on. These ultra-precision parts are required to have a high surface quality. Therefore, further precise machining and motion accuracy are required for the ultra-precision machine tools that machine these parts. Thus, the water-driven spindle, which is equipped with water hydrostatic bearings and a water-driven mechanism, was developed for ultra-precision machine tools. This spindle has higher stiffness than a spindle supported by aerostatic bearings. However, the heat generation due to fluid viscosity occurs at the bearings. If the temperature of each part in the spindle changes, undesirable deformation of the parts will occur. Deformation of the spindle during the machining process will then degrade the machining accuracy. In contrast, the water-driven spindle uses water as a lubricating fluid. Furthermore, water flow is supplied into the spindle in order to generate the driving power. Therefore, the water flow is an effective cooling medium for the water-driven spindle. Water cooling can be used to improve the thermal stability of the spindle because water has higher thermal conductivity and higher specific heat. In the present paper, the thermal stability of the water driven spindle is investigated experimentally. As a preliminary step, the changes in temperature of the water flow and the outer surface of the spindle are measured experimentally during spindle rotation at various rotational speeds. Furthermore, the influence of the power loss during spindle rotation on the temperature change of the water flow is investigated through calculations and experiments.