scholarly journals Stiffness of a Ball Screw Including with Consideration to Deformation of the Screw, Nut and Screw Thread. 4th Report, Effect of Preloading Method and Load Condition.

1992 ◽  
Vol 58 (547) ◽  
pp. 896-902
Author(s):  
Kazuki TAKAFUJI ◽  
Katuhiro NAKASHIMA
Keyword(s):  
Load Condition ◽  
Ball Screw ◽  
Screw Thread ◽  
Preloading Method

Model of Precision Loss for the Precision Ball Screw

2013 ◽  
Vol 753-755 ◽  
pp. 1680-1685 ◽  
Author(s):  
Guang Yuan Xu ◽  
Wei Jun Tao ◽  
Hu Tian Feng
Keyword(s):  
Dynamic Characteristics ◽  
Classical Mechanics ◽  
Load Condition ◽  
Ball Screw ◽  
Contact Theory ◽  
Hertz Contact ◽  
External Interference ◽  
Characteristics Analysis ◽  
The Impact ◽  
Dynamic Characteristics Analysis

Aiming at the precision retaining ability problems of the precision ball screw, the modeling on the motion precision loss process under load condition is studied. The mechanics and deformation of the interface of ball and groove under load condition is analyzed by using the classical mechanics and Hertz contact theory, also a precision loss model for precision ball screw is established based on the dynamic characteristics analysis of the ball screw. Regardless of the external interference, the impact of various factors on the precision loss is analyzed and calculated.

On Developing an Electromechanical Drive Equipped with a Ball Screw Protected from Jamming

2020 ◽  
pp. 66-82
Author(s):  
R.R. Abdulin ◽  
V.V. Bolshakov ◽  
A.S. Zudilin ◽  
A.N. Stitsenko ◽  
N.V. Krylov ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Import Substitution ◽  
Cylindrical Body ◽  
The Body ◽  
Ball Screw ◽  
Helical Line ◽  
Screw Thread ◽  
Screw Design ◽  
Electromechanical Drive ◽  
Rolling Elements

At present, one of the most pressing issues is the problem of improving electromechanical drive reliability, specifically, eliminating the possibility of jamming in the ball screw. The paper proposes an engineering solution designed to replace expensive imported ball screws. We analysed alternative designs intended to improve electromechanical drive reliability. We proposed and patented a ball screw design featuring a separator, in which the nut acts as a piston. The structure consists of a smooth cylindrical body and a slotted separator, its slots positioned along a helical line with a step equal to the thread lead. The body and the separator are coaxial and rigidly fixed together at the separator end faces so that the rolling elements remain in contact with the screw thread surfaces, the internal smooth cylindrical surface of the nut body and the surfaces of the separator slots. The ball screw design proposed, which features a nut with no internal threading, significantly simplifies the structure and its manufacturing technology. We built a model of an electromechanical drive equipped with a recirculating ball screw in order to determine static and dynamic properties of an electromechanical drive containing a ball screw featuring a separator. We compared the strength of the ball screw designs considered. As the ball screw featuring a separator is simpler and more reliable, the results of our analysis and the properties of an electromechanical drive equipped with the design proposed show that it is a promising solution to the import substitution problem concerning recirculating ball screws

Optimized Designing for Structure of Ball Screw Recycling Tunel

2011 ◽  
Vol 48-49 ◽  
pp. 802-806
Author(s):  
Xian Chun Song ◽  
Wen Cheng Tang ◽  
Hong Kui Jiang ◽  
Bo Song Rong ◽  
Hong Bin Zhou ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Load Condition ◽  
Ball Screw ◽  
Runge Kutta

In order to improve the load condition of the balls in the returner,a dynamic model for the balls moving through the ball-recycling tunel is established after a analysis on the kinetical geometry bounds for the balls.A program is setup in Matlab,according to the Runge-Kutta formula.And the radius of the ball-recycling tunel track of the returner ,which is being used by Jining Bote , is optimized computed in this program.It is estified that t he improved returner make the friction torq of the ball screw lower and stablizer.

scholarly journals Research on the precision loss of ball screw with short-time overload impact

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881790 ◽  
Author(s):  
Jiajia Zhao ◽  
Mingxing Lin ◽  
Xianchun Song ◽  
Hongkui Jiang
Keyword(s):  
Plastic Deformation ◽  
Load Condition ◽  
Ball Screw ◽  
Axial Deformation ◽  
Elastic Plastic ◽  
Precision Equipment ◽  
Model Combining ◽  
High Load Condition ◽  
Short Time ◽  
The Relationship

Ball screw is the driving functional component most frequently used for the precision equipment. To a certain extent, the transmission accuracy of precision equipment is affected by the position error of ball screw caused by the elastic–plastic deformation between ball and raceway under the overload impact. This article aims to investigate the precision loss of ball screw considering short-time overload impact. A novel precision loss model combining the Hertzian and Thornton contact theories is established to describe the variations in the axial deformation depths. Thus, the axial precision loss can be defined as the differential value between the initial no-loading travel variations and the loading stroke variations caused by the axial plastic deformation of raceway. Meanwhile, the maximum stress and the residual plastic deformation for four couples of ball-raceway materials are analyzed. Furthermore, the relationship between the precision loss and the elastic–plastic deformation is studied by the theoretical analysis and experiments. The results show that the position and precision is affected indeed by the contact deformation. The position and precision loss of the nut relative to the screw increases with the increase in the axial load. The results can help to provide the prediction for the precision life of ball screw operating in high-load condition.

scholarly journals A novel non-contact measuring system for the thread profile of a ball screw

2018 ◽  
Vol 9 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Leilei Zhao ◽  
Hutian Feng ◽  
Qianfeng Rong
Keyword(s):  
Ccd Camera ◽  
Measuring System ◽  
Ball Screw ◽  
Screw Thread ◽  
Outer Contour ◽  
High Position ◽  
Position Accuracy ◽  
Thread Profile ◽  
Data Points ◽  
Target Data

Abstract. In order to meet the demand of high position accuracy, many methods have been developed for measuring the thread profile features of ball screws. However, most of these efforts are limited to measuring a small number of ball screw features and therefore less efficient. In this study, an automatic, non-contact measuring system for the thread profile of a ball screw was developed. It is capable of measuring most common features of the ball screw thread profile and can measure ball screws of different sizes and lengths. The main part of the system is the light curtain which has a high-resolution line-scan CCD camera to measure the projected outer contour of the target. Data points from the thread profile of a ball screw were collected by the measuring system and data pre-processing was performed. Then, the proposed method was used to calculate the most important geometric parameters and errors of the thread profile. The accuracy of the measuring system was verified by testing and evaluating four sets of ball screws from different manufacturers.

Microdensitometer—computer correlation analysis of ultrastructural periodicity

1978 ◽  
Vol 36 (2) ◽  
pp. 32-33
Author(s):  
D.R. Ensor ◽  
C.G. Jensen ◽  
J.A. Fillery ◽  
R.J.K. Baker
Keyword(s):  
Correlation Analysis ◽  
Background Noise ◽  
Computer Control ◽  
Optical Diffraction ◽  
Screw Thread ◽  
Straight Line ◽  
Computer Storage ◽  
Correlation Process ◽  
Electron Microscope Image ◽  
Fixed Beam

Because periodicity is a major indicator of structural organisation numerous methods have been devised to demonstrate periodicity masked by background “noise” in the electron microscope image (e.g. photographic image reinforcement, Markham et al, 1964; optical diffraction techniques, Horne, 1977; McIntosh,1974). Computer correlation analysis of a densitometer tracing provides another means of minimising "noise". The correlation process uncovers periodic information by cancelling random elements. The technique is easily executed, the results are readily interpreted and the computer removes tedium, lends accuracy and assists in impartiality.A scanning densitometer was adapted to allow computer control of the scan and to give direct computer storage of the data. A photographic transparency of the image to be scanned is mounted on a stage coupled directly to an accurate screw thread driven by a stepping motor. The stage is moved so that the fixed beam of the densitometer (which is directed normal to the transparency) traces a straight line along the structure of interest in the image.

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