Abstract
Based on the theory of thermal transmission, this article provides a new method to acquire the friction coefficient in ball screw mechanism. While the screw is in thermal equilibrium, the heat absorption is equal to the heat dissipation. The heat absorption is able to be achieved by calculating the heat energy due to the friction at the contact area and the heat dissipation can be calculated by the law of thermodynamics. When the temperature rise is determined, the heat dissipation can be obtained and the friction coefficient in ball screw mechanism can be calculated further. In order to confirm the validity of this method, a measuring system is constructed to obtain the temperature rise of ball screws. The experimental results show that the temperature rise has the same tendency with the theoretical values depending on this model. Therefore, it can be exploited to predict the temperature rise of ball screws in the rated life cycle when the ball screw is under the condition of thermal equilibrium. Furthermore, this model can be used to evaluate the mechanical efficiency, which is an important parameter for the performance of the ball screw.
Highlights
The ball screw mechanism is widely used in computer numerical control (CNC) machining equipment to transmit force and movement due to its excellent performance in positioning accuracy and loading capacity.[1]
When a ball screw operates at a certain rotational speed and in the condition of thermal equilibrium, the input work is divided in two parts: the out work and the heat loss
A new method to acquire the friction coefficient in ball screw mechanism is proposed based on the theory of thermal transmission
Summary
The ball screw mechanism is widely used in computer numerical control (CNC) machining equipment to transmit force and movement due to its excellent performance in positioning accuracy and loading capacity.[1]. Keywords Ball screw, friction coefficient, thermal transmission, temperature rise, mechanical efficiency As the friction exists in the ball screw, the temperature rise happens when it is operating, especially at a high speed.
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