Ultraprecision Positioning by Preload Change of Lead Screws

Nakashima, Katuhiro; Tamaru, Yuuma; Takafuji, Kazuki

doi:10.1299/jsmec.44.808

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Hu et al 12 used a homogeneous transformation matrix to establish a kinematic model for a basic single-driven ball screw mechanism and analyzed the kinematic characteristics and slide–roll ratios at the contact points of the raceways. Nakashima et al 13 analyzed the influence of the ball screw pair of a double nut on the elastic deformation of the screw in an ultra-precision positioning test table when the preload was changed. Mu and Feng 14 analyzed the kinematic parameters of a nut-driven ball screw mechanism, studied the problem of isothermal elastohydrodynamic lubrication in elliptical contacts, and used a multigrid solver to derive the numerical solution for the parameters.…”

Section: Introductionmentioning

confidence: 99%

Kinematic analysis and simulation of a new type of differential micro-feed mechanism with friction

Feng

Sun

2019

Science Progress

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This article presents a new micro-feed mechanism, whose main transmission component is the nut–rotary ball screw pair. The screw and nut are driven by two motors, and they rotate in the same direction, with their movements enabling micro-feeding. The main contribution of the micro-feed mechanism is to avoid the inevitable low-speed nonlinear creeping phenomenon caused by the inherent properties of traditional electromechanical servo system structure, thus realizing high precision micro-feed. In this study, the motion state of the working ball is analyzed using the principle of differential geometry, the friction at the contact points is calculated, the balance equation for force and moment is established, the influences of the screw and nut on the kinematic parameters of the ball at different velocities and the differences in the motion states of the ball in different drive modes are studied, and the mechanical efficiency of the dual-driven ball screw mechanism is calculated. The potential applications of the new micro-feed mechanism and the results of numerical analysis can be applied to advanced technology fields such as robotics, suspensions, powertrain, national defense, integrated electronics, optoelectronics, medicine, and genetic engineering, so that the new system can have a lower stable speed limit and achieve precise micro-feed control.

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Section: Introductionmentioning

confidence: 99%

Kinematic analysis and simulation of a new type of differential micro-feed mechanism with friction

Feng

Sun

2019

Science Progress

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“…Considering the wear depth of an asperity, the contact ratio between the plastic and normal contact areas and the wear frequency due to the relative speed of the two contact surfaces, Wei et al (2012) established a new two-body abrasion model to describe the variation in the axial wear depths with the operating strokes by extending the micro-contact theory. However, the axial load must be smaller than the preload of the ball screws in Wei's model, while in fact, the axial load must be at least 2.8 times higher than the preload to maintain high mechanical efficiency (Nakashima et al, 2001). Lin et al (1994) and Wei and Lin (2003) have presented the slipping velocity between a ball and the screw raceway, and part of their studies was adopted in this paper.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the precision loss for ball screw raceway based on the modified Archard theory

Zhou

Feng

et al. 2017

ILT

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Purpose This paper aims to examine the precision loss of ball screw raceway under different operating conditions and geometry parameters. Design/methodology/approach Based on a new coefficient K’ introduced especially for ball screws to reflect the actual contact condition, the modified Archard theory is applied to ball screws to obtain wear volume of the ball-screw contacts. Thus, the axial precision loss can be defined as the ratio of the wear volume to the contact area. Meanwhile, a novel running bench and a precision-measuring system of ball screws are conducted. Precision variation is obtained and analyzed during the whole life running test, which agrees well with the theoretical values calculated in this paper. Findings For a given rotational speed, the increasing rate of the precision loss rate is high at low axial load and then becomes small with the increasing axial load, whereas for a given axial load, the precision loss rate is proportional to the rotational speed. Besides, the precision loss rate is reduced with the increasing contact angle between a ball and the screw raceway, and is proportional to the helix angle when the angle changes from 1 to 10 degrees. Research limitations/implications The rotational speed used in this experiment is low and the ball screw is of no-load type, although results calculated by the model and Wei’s model seem close when the axial load is high, whether the model built in the paper is applicable to the condition of high rotational speed and preload still needs to be verified in the future work. Practical implications This study provides an accurate model to predict the precision loss of the screw raceway and estimate the remaining life of ball screws, which is significant for better performance of ball screws as well as the computer numerical control machine tools. Originality/value Previous studies on the wear of ball screws mainly focused on the drag torque analysis and mechanical efficiency estimation, and the experiment to verify their theoretical analysis was almost all limited to the test of drag torque or axial rigidity, which is neither sufficient nor persuasive. However, in this paper, the authors proposed a comprehensive wear prediction model which combines the modified Archard wear theory, Hertz contact theory and kinematic theory of ball screws. To the best of the authors’ knowledge, this kind of study has never been reported in the literature. In addition, for the lack of the test bench and high cost of the experiment, the whole life operation test, which is designed and conducted to confirm the model in this paper, has never been reported in literature either.

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Kinematical analyses and transmission efficiency of a preloaded ball screw operating at high rotational speeds

Wei

Lai

2011

Mechanism and Machine Theory

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Ultraprecision Positioning by Preload Change of Lead Screws

Cited by 5 publications

References 6 publications

Kinematic analysis and simulation of a new type of differential micro-feed mechanism with friction

Kinematic analysis and simulation of a new type of differential micro-feed mechanism with friction

Investigation of the precision loss for ball screw raceway based on the modified Archard theory

Kinematical analyses and transmission efficiency of a preloaded ball screw operating at high rotational speeds

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