探討切屑熱量對滾珠螺桿螺帽間熱傳之影響;Study on the Effect of Chip Heat on the Heat Transfer between the Shaft and the Nut of a Ball Screw Drive System.

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Title:	探討切屑熱量對滾珠螺桿螺帽間熱傳之影響;Study on the Effect of Chip Heat on the Heat Transfer between the Shaft and the Nut of a Ball Screw Drive System.
Authors:	李迦暐;LI, CHIA-WEI
Contributors:	機械工程系研究所
Keywords:	定位精度;加熱片;切屑;滾珠螺桿;positioning accuracy;chip;nut;ball screw drive system
Date:	2018
Issue Date:	2019-05-23 12:52:46 (UTC+8)
Publisher:	機械工程系研究所
Abstract:	滾珠螺桿進給系統（BSDS）已廣泛應用於各種工業機械，如精密模具機械，電子機械和運輸機械等。BSDS的定位誤差主要是由滾珠螺桿軸向熱變形所引起的。在運行期間，BSDS會產生大量熱量，導致熱膨脹，這會對定位精度產生負面影響。主要的熱源包括滾珠螺桿主軸、螺帽、軸承、滑塊及切屑熱量。本研究探討了切屑熱量對BSDS定位精度的影響。首先，設計數學模型和實驗來估算切屑到載台上的熱通量。然後，進行另一個模型及實驗以預測滾珠螺桿主軸和螺帽之間的熱通量變化。結果顯示，通過數學模型估算切屑傳到BSDS載台上的熱通量約為50 W/m2。在5公尺/分鐘（mpm）的進給速度下螺帽與滾珠螺桿主軸之間的熱通量和熱對流係數分別為500 W/m2和10 W/m2-K；而在10 mpm的進給速度下螺帽與滾珠螺桿主軸之間的熱通量和熱對流係數分別為850 W/m2和11 W/m2-K。當在載台上的小面積切屑熱通量在10到100 W/m2之間時，螺帽和滾珠螺桿之間的熱通量沒有顯示出明顯的變化。然而，當載台上的大面積切屑熱通量在200 W / m2、進給速度為5 mpm時，從滾珠螺桿主軸到螺帽的熱通量減少了75 W / m2，但在10 mpm的進給速度下沒有明顯變化。 A ball screw drive system (BSDS) has been widely employed in various industrial machinery, such as precision tooling machinery, electronic machinery and transportation machinery. The position error of the BSDS is mainly caused by the thermal deformation of the ball screw shaft. During operation, a BSDS can produce significant heat, resulting in a thermal expansion, which has a negative impact on positioning accuracy. The main source of heat includes the ball screw shaft, nuts, bearings, sliders and chips from work pieces. This study investigates the effect of chip heat on the position error of a BSDS. First, a mathematical model and experiments are designed to estimate the heat flux from chips to the working table. Then, another model and experiments are conducted to predict the heat flux variation between the ball screw shaft and the nut.Results show that heat flux form chips to the working table of the BSDS is estimated around 50 W/m2 by the mathematical model. The heat flux between the nut and the ball screw shaft and heat convection coefficient are estimated as 500 W/m2 and 10 W/m2-K, respectively, at the feed speed of 5 meter per minute (mpm); whereas 850 W/m2 and 11 W/m2-K at 10 mpm. When the chip heat flux ranges between 10 and 100 W/m2 within a small area of the working table, the heat flux between the nut and the ball screw drive shows no significant variation. However, when a larger area of the working table is covered by falling chips with a heat flux of 200 W/m2, the heat flux from the ball screw shaft to the nut is reduced by 75 W/m2 at 5 mpm but shows no significant change at 10 mpm.
Appears in Collections:	[機械工程學系] 學位論文

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