Feed fluctuation of ball screw feed systems and its effects on part surface quality

Liang, Ted; Lu, Dun; Yang, Xiaojun; Zhang, Jun; Ma, Xiaobo

doi:10.1016/j.ijmachtools.2015.11.002

Cited by 35 publications

(10 citation statements)

References 23 publications

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“…x z ′′ ′′ The range of standard conditions within static steadiness of the complex mass center positions is restricted by the contour Q′′K′′N′′F ′′. The contour at the section K′′N′′ corresponds to the circle arc, and it will be described by the dependences (11,12) at the sec tions F ′′N′′ and Q′′K′′ where q < 0.…”

Section: Fig 4 Kinematic Diagram Of the Lever-type Manipulator In-mentioning

confidence: 99%

Determination of static equilibrium conditions of a mobile terrestrial robotic complex

Strutynsky¹,

Hurzhii²,

Kozlov³

2019

NVNGU

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Purpose. Determination of the location of a robotic complex and an object being manipulated. Methodology. The applied theoretical methods are based on the solution of the problems of mechanical system statics, Monte Carlo methods and analytical geometry with approbation of the obtained results on a robotic complex prototype.findings. The conditions of the static equilibrium of a mobile terrestrial robotic complex with a levertype manipulator are established. They are based on the analytical correlation as the sum of moments of gravitational forces acting on the joints of the complex relative to the axes passing through the extreme supporing points of the chassis.The location of the mass center of the robotic complex with the levertype manipulator is determined. The area is created by the arc of a circle whose radius depends on the mass of the object captured by the manipulator. The influence of static chassis de formations on the permissible complex area location of the general mass center is defined. It is found how the complex location influenses the inclined surface of the tolerable area of the mass center location in terms of the persistency. The efficient conditions of the large mass manipulated object location are set.originality. Necessary and sufficient conditions for the terrestrial robotic complex to remain in a static equilibrium when work ing with objects of significant mass are determined. The area of the general mass center of the complex with all possible positions of the manipulator and different mass of the object being manipulated on the basis of the Monte Carlo methods adapted to the solution of the static problem of the terrestrial robotic complex with a lever type manipulator is established. In this case, the bear ing system deformability of the chassis and the features of the position of the complex being located on an inclined plane are considered.Practical value. The established conditions of the robotic complex static stability are the basis of the choice of its geometric parameters for providing maximum working capacity in different operating conditions.

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Section: Fig 4 Kinematic Diagram Of the Lever-type Manipulator In-mentioning

confidence: 99%

Determination of static equilibrium conditions of a mobile terrestrial robotic complex

Strutynsky¹,

Hurzhii²,

Kozlov³

2019

NVNGU

View full text Add to dashboard Cite

show abstract

“…The improvement of the characteristics of these elements is a promising way, which will increase the technical level of mobile robot manipulators. The publication [8] outlines a number of requirements for geometric parameters, the ranges of transverse angular displacements of joints, in particular. Separate designs of manipulator hinges constructed on the basis of parallel link mechanisms [9] are considered.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Design of parallel link mobile robot manipulator mechanisms based on function-oriented element base

Strutynskyi

Ночніченко

2019

EEJET

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“…The double nut pretightening ball screw is widely used in CNC machine tools. Compared with a single nut ball screw, there is no clearance between the screw and the mother screw in the transmission process, thus significantly improving the welding accuracy, and the presence of pretightening force also plays an important role in improving the axial contact stiffness of double-nut ball screws [19].…”

Section: Internal Load Distribution Of Double-nut Ball Screwsmentioning

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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Feed fluctuation of ball screw feed systems and its effects on part surface quality

Cited by 35 publications

References 23 publications

Determination of static equilibrium conditions of a mobile terrestrial robotic complex

Determination of static equilibrium conditions of a mobile terrestrial robotic complex

Design of parallel link mobile robot manipulator mechanisms based on function-oriented element base

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

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