Preload degradation mechanism of double-nut ball screws revealed by an innovative wear distribution model

Article Engineering, Mechanical

A novel approach to predict the precision sustainability of ball screw under multidirectional load states

Jiajia Zhao et al.

Summary: This study established a novel contact load model for ball screws, examined the influence of load on precision and variations in position accuracy, and designed a new working bench for experimental research.

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE (2021)

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Review Engineering, Manufacturing

Positioning accuracy degradation and lifetime prediction of the ball screw considering time-varying working conditions and feed modes

Qiang Cheng et al.

Summary: The study developed an exponential prediction model for the positioning accuracy of BSM based on time-varying working conditions, using a macro-micro multiscale method. The microscopic wear process and positioning accuracy retention were investigated, and tests were conducted to determine the characteristics of BSM positioning accuracy under normal feed mode. The exponential wear model was used to describe wear status and predict accuracy loss values and positioning accuracy lifetime.

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE (2021)

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Article Engineering, Manufacturing

Study on heat transfer characteristics and thermal error suppression method of cylindrical giant magnetostrictive actuator for ball screw preload

Xiaojun Ju et al.

Summary: This study proposes a thermal error suppression method using an oil cooling system to control the temperature of a cylindrical giant magnetostrictive actuator (CGMA) for ball screw preload. By combining thermal circuit model analysis with finite element simulation analysis, the design parameters of the oil-cooling temperature control system are optimized, significantly improving the output accuracy and stability of the CGMA.

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE (2021)

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Article Engineering, Mechanical

Investigation of the decompression condition of double-nut ball screws considering the influence of the geometry error and additional elastic unit

Chang-Guang Zhou et al.

Summary: This study proposed a modified load distribution model to obtain the critical axial loads of double-nut ball screws and constructed a new test rig to validate the model's accuracy. Analysis showed that the influence of geometry errors on the decompression condition of double-nut ball screws is neglectable compared with the preload.

MECHANISM AND MACHINE THEORY (2021)

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Article Engineering, Mechanical

A modeling method for predicting the precision loss of the preload double-nut ball screw induced by raceway wear based on fractal theory

Jiajia Zhao et al.

Summary: This paper proposes a new method to characterize the rough spherical morphology of raceways for ball screws based on fractal theory, identifying the fractal parameters of the screw and nut raceways and establishing a fractal contact model of the raceway surface. Discussions include the contact coefficient of the inner and outer raceways, the influence of raceway fractal parameters on wear rate, and coupling research on precision loss and preload degradation for the ball screw.

WEAR (2021)

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Article Engineering, Mechanical

A new model for the preload degradation of linear rolling guide

Chang-Guang Zhou et al.

Summary: A preload degradation model for LRG was proposed and experimentally verified, showing that factors such as external load, running speed, and fractal parameters affect the rate of preload loss. The numerical simulation results indicated the varying degrees of influence these factors have on the rate of preload loss in linear rolling guides.

WEAR (2021)

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Article Engineering, Mechanical

Investigation on the ball screws no-load drag torque in presence of lubrication through MBD simulations

Antonio Carlo Bertolino et al.

Summary: The trend towards more electric aircraft, mainly driven by environmental and cost saving concerns, has led to increased efforts to replace traditional electro-hydraulic configurations with electro-mechanical actuators for flight control. This shift has theoretical advantages in terms of weight and environmental impact. The paper focuses on analyzing drag torque contributions in preloaded double nut ball screws of EMAs, highlighting the strong dependency of drag torque on temperature and lubricant viscosity.

MECHANISM AND MACHINE THEORY (2021)

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Article Engineering, Mechanical