Prediction of Thermal Deformation for a Ball Screw System Under Composite Operating Conditions

2014 ◽  
pp. 17-30 ◽  
Author(s):  
A. S. Yang ◽  
S. Z. Chai ◽  
H. H. Hsu ◽  
T. C. Kuo ◽  
W. T. Wu ◽  
...  
Keyword(s):  
Thermal Deformation ◽  
Operating Conditions ◽  
Ball Screw

The analysis on the influence of mixed sliding-rolling motion mode to precision degradation of ball screw

2021 ◽  
pp. 095440622098201
Author(s):  
Qiang Cheng ◽  
Baobao Qi ◽  
Hongyan Chu ◽  
Ziling Zhang ◽  
Zhifeng Liu ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Experimental Tests ◽  
Theoretical Models ◽  
Operating Conditions ◽  
Ball Screw ◽  
Rolling Motion ◽  
Degradation Model ◽  
Sliding Motion ◽  
Factors Analysis ◽  
Motion Mode

The combination of sliding/rolling motion can influence the degree of precision degradation of ball screw. Precision degradation modeling and factors analysis can reveal the evolution law of ball screw precision. This paper presents a precision degradation model for factors analysis influencing precision due to mixed sliding-rolling motion. The precision loss model was verified through the comparison of theoretical models and experimental tests. The precision degradation due to rolling motion between the ball and raceway accounted for 29.09% of the screw precision loss due to sliding motion. Additionally, the total precision degradation due to rolling motion accounted for 21.03% of the total sliding precision loss of the screw and nut, and 17.38% of the overall ball screw precision loss under mixed sliding-rolling motion. In addition, the effects of operating conditions and structural parameters on precision loss were analyzed. The sensitivity coefficients of factors influencing were used to quantitatively describe impact degree on precision degradation.

Numerical Analysis on Thermal Deformation of Linear Motor in Chip Mounter

2011 ◽  
Author(s):  
Kang-Woo Joo ◽  
Kwang-Sun Kim ◽  
Jun-Young Kim ◽  
Hee-Rak Beom
Keyword(s):  
Thermal Deformation ◽  
Linear Motor ◽  
Ball Screw ◽  
Heat Transfer Analysis ◽  
Semiconductor Chip ◽  
Research Activities ◽  
And Performance ◽  
Stress And Deformation ◽  
Electro Magnetic ◽  
Semiconductor Chips

In the semiconductor chip mounting process, the size of semiconductor chips is decreasing, while the number of mounting the chips per time are increasing, and this trend is being accelerated. The research activities to develop the chip mounters, which are able to mount rapidly and accurately, have been needed in the industry. With this background, the linear motor in the chip mounters has been an important part. The electro-magnetic type linear motor has many advantages such as direct linear reciprocating motion being compared with the rotary motor and the ball screw type linear motor. However, the electro-magnetic linear motor has thermal problems. These problems affect life and performance of motor and bring out the other problems such as thermal stress and deformation. The heat transfer analysis is difficult to solve thermal problems because the moving and fixed parts coexist. The trial & error methods have been therefore used under majority of cases. In this paper, we investigated the thermal deformation problems of linear motor in a chip mounter and the optimized parameters to design the motion parts of electro-magnetic linear motor were obtained.

Fractal Analysis for Vibrational Signals Created in a Ball-Screw Machine Operating in Short- and Long-Range Tribological Tests

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Min-Chi Chang ◽  
Jeng Luen Liou ◽  
Chin-Chung Wei ◽  
Jeng-Haur Horng ◽  
Yueh-Ling Chiu ◽  
...  
Keyword(s):  
Long Range ◽  
Fractal Analysis ◽  
Rotational Speed ◽  
Operating Conditions ◽  
Ball Screw ◽  
Frictional Torque ◽  
A Value ◽  
Vibrational Signals ◽  
Inner Surface ◽  
Range Test

In the present study, the vibrational and frictional torque signals acquired from the forward-backward movements of a commercial ball-screw system were considered via mono fractal analysis. The short-range tests were carried out in order to investigate the effects of operating conditions, a nut's inner surface roughness and the applied pretension (preload) on the fractal dimension (Ds) and topothesy (G). The long-range test was conducted to observe the variations of vibrational and frictional torque signals and thus the fractal parameters acquired from the ball-screw operations under the condition of no fresh grease supply during the testing process. The effects of the ball-screw rotational speed and pretension on the G parameter of vibrations were greater than the Ds parameter. In the backward movement, the highest G value always occurred at the highest rotational speed (3000 rpm in this study). The Ds parameter generated in the forward movement by the nut's inner surface before polishing produced a value greater than that by the nut with a polished surface. The G parameter related to vibrational amplitudes showed a value before polishing greater than that after polishing. The unusual vibrational signals are assumed to be related to ball passing behavior. Their experimental frequency was verified to be consistent with the frequency predicted by the ball pass theory. An increase in the rotational speed can bring a significant increase in the number of ball-pass signals. The G parameter and its skewness data, defined for the number distribution function of the G peaks, showed values that in general increased with the test time if the fresh grease was not supplied during the long-range test.

Temperature Field Simulation of Ballscrew Whirlwind Milling

2012 ◽  
Vol 591-593 ◽  
pp. 588-592 ◽  
Author(s):  
Yan Feng Li ◽  
Jian Song ◽  
Shao Hui Liu ◽  
Xian Chun Song
Keyword(s):  
Temperature Distribution ◽  
Thermal Deformation ◽  
Influence Factors ◽  
Internal Heat ◽  
Ball Screw ◽  
Ansys Simulation ◽  
Distribution Rule ◽  
Nc Machine ◽  
Mechanical Devices ◽  
Deformation Error

Ball screw is the key parts of NC machine, precise instrument and many kinds of mechanical devices. Whirlwind milling is a new and effective thread manufacture technology. This article studies the internal heat conduction equation of whirlwind milling ball screw based on Heat Transfer, calculates ANSYS simulation result. The simulation results show that the surface temperature distribution rule and internal temperature distribution rule of a ballscrew is consistent. The article analyzes the influence factors of the thermal elongation. It provides a basis for compensating the thermal deformation error of whirlwind milling ballscrew.

scholarly journals Further study on thermal deformation reduction for CFRP-based improved ball screws

2020 ◽  
Vol 29 ◽  
pp. 2633366X2091798
Author(s):  
Xiangsheng Gao ◽  
Yueyang Guo ◽  
Min Wang ◽  
Tao Zan
Keyword(s):  
Thermal Deformation ◽  
Working Condition ◽  
Ball Screw ◽  
Fe Model ◽  
Input File ◽  
Fe Method ◽  
Time Step ◽  
Actual Working ◽  
G Code ◽  
Novel Method

To determine the thermal deformation of ball screw in actual working condition, a novel method for determining thermal deformation of ball screws in complicated working condition is proposed based on G-code and finite-element (FE) method. In the complicated working condition, it is difficult to obtain and import the nut movement into FE model due to the complex nut movement. In this research, the nut movement is directly determined from G-code by MATLAB code programming. The nut location is recorded with time in a file. The thermal parameters can be determined according to the nut speed with time as well. In the implicit FE analysis, the nut location is read from the input file instead of nut location calculation before every time step. And then, the effect of factors, such as working condition and materials, on thermal deformation reduction of ball screw is studied. The thermal deformation reduction of ball screws under different rotational speed, actual working condition, and different axial elastic modulus of composites is discussed, which can provide the guidelines to evaluate the thermal deformation reduction and design the composite in improved ball screws.

Precision of prestressed ball screw thermal behaviour in machine tool operating conditions

2020 ◽  
Vol 16 (1) ◽  
pp. 29
Author(s):  
Zbigniew Kowal ◽  
Jerzy Jedrzejewski ◽  
Taeweon Gim
Keyword(s):  
Machine Tool ◽  
Thermal Behaviour ◽  
Operating Conditions ◽  
Ball Screw

Analysis of Dynamic Characteristic of Numerical Remanufacture Machine's Feeding System

2010 ◽  
Vol 156-157 ◽  
pp. 1360-1365
Author(s):  
Qiu Lin Pu ◽  
Xiao Diao Huang ◽  
Wen Zheng Ding
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Operating Conditions ◽  
Ball Screw ◽  
Response Analysis ◽  
Feeding System ◽  
Nature Frequency ◽  
Grinding Machine ◽  
The Finite Element Model

In this paper,the ball screw feeding system’s dynamic characteristics of a numerical remanufacture grinding machine is analyzed using the FEM. Discusses the modeling method of ball screw system into the finite element model and established the combination of finite element model. Through the modal analysis and the harmonious response analysis, the nature frequency and vibration mode of the feeding system and typical operating conditions of excitation in the harmonic responsehave have been gotten,thus the dependable basis for the construction’s optimization and dynamic function’s increasing of the feeding system is provided, ensure the numerical remanufacture will be success.

scholarly journals Reduction of Thermal Deformation in a Motor Precision Positioning Device Cooled by Peltier Elements

2013 ◽  
Vol 7 (5) ◽  
pp. 544-549 ◽  
Author(s):  
Takashi Nozaki ◽  
◽  
Jiro Otsuka
Keyword(s):  
Beneficial Effect ◽  
Thermal Deformation ◽  
Ball Screw ◽  
Precision Positioning ◽  
Positioning Errors ◽  
Positioning Device

In a precision positioning device, positioning errors due to thermal deformation arise from heat generated by the motor and by friction between the ball screw and the nut. However, their proportional contributions to thermal deformation are not clear. In this study, thermal deformation was reduced by cooling the motor with Peltier elements, which had a beneficial effect on the precision of the positioning device.

scholarly journals Temperature Rise and Thermal Deformation of Magnetic Pole of MLDSB under Multiple Physical Field Coupling

2020 ◽  
Author(s):  
JianHua ZHAO ◽  
Ji-Sheng ZHAO ◽  
Sheng LI ◽  
Zhe WANG ◽  
Guo-Jun DU ◽  
...  
Keyword(s):  
Heat Loss ◽  
Temperature Rise ◽  
Thermal Deformation ◽  
Operating Conditions ◽  
Physical Field ◽  
Magnetic Pole ◽  
Distribution Law ◽  
Transfer Path ◽  
Field Coupling ◽  
Magnetic Poles

Abstract The thermal deformation of magnetic poles caused by the heat loss of the coils of Magnetic Liquid Double Suspension Bearing (MLDSB) can reduced the gap between magnetic poles and magnetic sleeve, and the probability and degree of impact-rub can be increased in the working process of MLDSB. And the coatings of magnetic poles and magnetic sleeve can be worn overly, and the operation stability and service life of MLDSB will be reduced severely. The thermal deformation of magnetic poles can be affected by the material property of magnetic pole, the electric current of the coils, and the cooling effect of the lubricants and so on, so it belongs to the multiple physical field coupling. Therefore, the flow-solid-thermal coupled mathematics model of MLDSB is established and solved with ANSYS in this paper, and the distribution law of flow field of the magnetic pole is explored. The transfer path and distribution principles of heat loss are revealed and the distribution law of temperature rise and thermal deformation of magnetic pole in different operating conditions are explored. The results indicate that the temperature rise and thermal deformation of the stator is symmetrically distributed in the center, it gradually increase from the outside to the center, and the thermal deformation near the corner of magnetic pole is largest. The most heat loss can be taken away by the lubricants under the condition of heat balance. The thermal deformation of magnetic pole can increase linearly as the current gradually increase, and the stress is concentrated in the threaded hole and magnetic pole. The thermal deformation decreases linearly as the inlet pressure of the lubricants gradually increase. The PIV results of flow trace are basically consistent with the simulation results. The research in this paper can provide the theoretical reference for the structural design and the optimization of MLDSB.

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