Abstract
This study investigated the ambient environmental temperature effect on the positioning accuracy of a periodically-moving carrier. The moving carrier was operated in an environmental chamber in which the operational temperature could be controlled by an air conditioning system. Different operational temperature modes, including a stable environment, a rise in temperature, a decline in temperature, summer daytime hours, and winter nighttime hours in terms of seasonal climate change in Taiwan, were generated within the environmental chamber by an air conditioning system to investigate the operational temperature’s effect on positioning accuracy. From the experimental measurements of a periodically-moving carrier, it is found that the operational temperature conditions can significantly affect the positioning accuracy of the moving carrier, especially in the case of an operational temperature decline. Under stable operational conditions, the positioning accuracy of the moving carrier can be considerably improved. In comparison to the case of an operational temperature decline, the positioning accuracy improvement can reach 29.6%. Moreover, the effect of the temperature distributions within the chamber on the positioning accuracy was further investigated. It was found that, with a parallel flow pattern in the chamber, the positioning accuracy can be further enhanced.
Highlights
Demands for high production in the manufacturing industry are increasing due to global competition
Different environmental temperatures can be created within the designed environmental chamber to investigate the ambient temperature effect on the positioning accuracy of the moving carrier
We found that a decline in the operational temperature caused the positioning accuracy to worsen for a periodically-moving carrier
Summary
Demands for high production in the manufacturing industry are increasing due to global competition. Thermal deformation resulting from daily ambient temperature variations, in terms of different seasons and the effect of flow patterns around the moving machines on positioning accuracy, has not been experimentally investigated. Different operational temperature modes, including a stable environment, temperature rise, temperature drop, summer daytime hours, and winter nighttime hours, were generated within the environmental chamber by the air conditioning system to investigate the operational temperature’s effect on positioning accuracy. Analyses were based on CFD simulations, aiming to investigate the locations of air inlets and air outlets on the flow field in the chamber to ensure the stability of air flow and the laminar field within the processing area, achieving further improvements in terms of the positioning accuracy of a moving carrier
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