| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 99 === This paper is aimed to discuss how the rotational speed of ball screw, which is high and low, have an effect in different operation conditions upon the transmission efficiency and vibration friction. And in the experiment, we employ manifold sensors to analyze and compare each of datas. To understand how the friction influence the transmission efficiency and vibration, in this study, we analyze the data with different operation condition and rotational speed using spectral estimation and statistical method.
The experimental results indicated that frictional heat source, generated by the ball screw in operation, leads to thermal deformation of material, which causes a tight fit in mechanical components inside the screw nut reducing the sliding phenomenon between the contact surface, and consequently the input torque decreases as experimental time goes on. In the analysis of friction vibration, the rigidity of ball screw increases as a result of friction heat effect, which makes high frequency friction vibration larger with experimental time going on. With respect to the use of cooling system of ball screw, for the lack of cooling, the condition without cooling system being on exacerbates the frictional heat effect, which results from the operation of machine, more than that with cooling system being off, and thus the ball screw without cooling system being on requires less input torque of motor than that with the cooling system being on, and vice versa.
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