Double nut ball screw with improved operating characteristics

Verl, Alexander; Frey, Siegfried; Heinze, T.

doi:10.1016/j.cirp.2014.03.128

Cited by 35 publications

(16 citation statements)

References 6 publications

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“…the axial load while still maintaining a certain contact pressure on the balls. 5 It can also be found that the critical load increases with the increase in the preload. Figure 8 illustrates the law that the preload increment arising in the position preloaded ball screw mechanism varies with the screw's rotational speed under no axial load.…”

Section: Axial Deformation Of Nut Under the Axial Loadmentioning

confidence: 93%

Dynamic axial contact stiffness analysis of position preloaded ball screw mechanism

Liu

2019

Advances in Mechanical Engineering

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This article establishes an axial contact stiffness model of position preloaded ball screw mechanism based on Hertz contact theory. The analysis of dynamic axial contact stiffness is one of the foundations of the research on the dynamic characteristic of the ball screw feed drive system. The model takes into account the coupling relationship between the contact angle and the normal contact force, as well as the coupling relationship between the elastic deformation and the contact deformation coefficient. The static and dynamic axial contact stiffness characteristics of the preloaded ball screw mechanism are studied. The numerical analysis result shows that the static contact stiffness of the preloaded ball screw mechanism increases with the increase in the preload and decreases with the increase in the axial load. The dynamic contact stiffness of the preloaded ball screw mechanism increases with the increase in the screw's rotational speed. The variation range of dynamic contact stiffness increases with the increase in axial load under the same preload. And the variation range of dynamic contact stiffness decreases with the increase in preload under the same axial load. The axial contact stiffness model established in this article can be used to analyze either static or dynamic contact stiffness of position preloaded ball screw mechanism.

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Section: Axial Deformation Of Nut Under the Axial Loadmentioning

confidence: 93%

Dynamic axial contact stiffness analysis of position preloaded ball screw mechanism

Liu

2019

Advances in Mechanical Engineering

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“…To design an optimized preload system for a ball screw, Verl et al [4] studied the influences of preload force and nut and geometric parameters of the screw raceway on the axial stiffness of the ball screw from the nut structure. They proposed a calculation method for the axial stiffness of the ball screw.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Luo

Jiao

et al. 2019

Mathematical Problems in Engineering

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Double-nut ball screws bear the action of bidirectional pretightening force, leading to the deformation of the contact area between the ball and the raceway. Under this condition, it is important to analyze and calculate the static stiffness of the ball screw. However, the conventional calculation method is inaccurate. Hence, a new method for the static stiffness analysis of a double-nut ball screw is proposed. Through the structural analysis of the ball screw and internal load distribution, a load deformation model was established based on the Hertzian contact theory. Through the load analysis of the ball screw, a static stiffness model of the ball screw was established and applied to a case study and a finite element simulation. The rigidity of THK double-nut ball screws used in the X-axis feed system of a high-stiffness heavy-duty friction stir welding robot (developed by the research group) was calculated. When the workload was lower than 1.1 × 104 N, the slope of the double-nut static stiffness curve increased significantly with the increase in the workload, and when the workload was greater than 1.1 × 104 N, its upward slope tended to stabilize. The simulated and experimental stiffness curves were in good agreement; when the external axial load was greater than 2.8 × 104 N, the stiffness value calculated using the finite element method gradually converged to the theoretical value; and when the axial load reached 3.0 × 104 N, the simulation and test curves matched well. The analysis method of the double-nut ball screw was found to be concise and accurate, and the stiffness curves calculated using the two methods were consistent. The simulation analysis of the static stiffness presented herein is expected to aid the design of double-nut ball screws of high-rigidity heavy-duty equipment.

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“…Weule and Frank [5] improved the positioning performance of a ball screw mechanism through an additional preload control process. Verl and Frey [6,7] showed that the preload force increases linearly with an increasing spin speed. Wei et al [8] developed a mathematical model for describing the effects of preload and lubrication on the dynamic behavior of a singlenut double-cycle ball screw.…”

Section: Introductionmentioning

confidence: 99%

Effect of environmental temperature on dynamic behavior of an adjustable preload double-nut ball screw

Liu

Lin

et al. 2018

Int J Adv Manuf Technol

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The dynamic behavior of adjustable preload double-nut ball screw has been investigated by finite element simulation model under different environmental temperature conditions. The simulations focus specifically on the effects of the ambient temperature (5~55°C) on the torque acting on the flange of the ball screw mechanism at rotational speeds of 50~1000 rpm. The environment temperature effect was less studies to discuss the heat deformation issue of ball screw. The validity of the simulation results is confirmed by comparing the predicted torque values with the experimental measurements. It is shown that the torque decreases logarithmically with an increasing temperature due to a change in the expansion coefficients of the ball screw mechanism components and a reduction in the viscosity of the ball screw lubricant. In particular, for a rotational speed of 1000 rpm, the torque reduces by approximately 75.6% as the environmental temperature is increased from 5 to 55°C. However, for a constant temperature, the torque decreases with an increasing rotational speed due to centrifugal effects. For a low-rotational speed of 100 rpm, a good qualitative agreement is observed between the simulated torque and the measured torque at higher temperatures. However, in the low-temperature regime (e.g., 5°C), the simulated torque is around 47.6% lower than the measured value.

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Double nut ball screw with improved operating characteristics

Cited by 35 publications

References 6 publications

Dynamic axial contact stiffness analysis of position preloaded ball screw mechanism

Dynamic axial contact stiffness analysis of position preloaded ball screw mechanism

Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double‐Nut Ball Screw with Heavy Load and High Precision

Effect of environmental temperature on dynamic behavior of an adjustable preload double-nut ball screw

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