Thermal characteristic analysis of high-speed motorized spindle system based on thermal contact resistance and thermal-conduction resistance

2014 ◽  
Vol 76 (9-12) ◽  
pp. 1913-1926 ◽  
Author(s):  
Zhifeng Liu ◽  
Minghui Pan ◽  
Aiping Zhang ◽  
Yongsheng Zhao ◽  
Yong Yang ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Conduction ◽  
High Speed ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Thermal Characteristic ◽  
Characteristic Analysis ◽  
Motorized Spindle ◽  
Spindle System

scholarly journals Design and thermal characteristic analysis of motorized spindle cooling system

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110208
Author(s):  
Yuan Zhang ◽  
Lifeng Wang ◽  
Yaodong Zhang ◽  
Yongde Zhang
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Thermal Deformation ◽  
Cooling System ◽  
Thermal Characteristic ◽  
Water Flow Rate ◽  
Thermal Characteristics ◽  
Characteristic Analysis ◽  
Motorized Spindle ◽  
Experiment And Simulation

The thermal deformation of high-speed motorized spindle will affect its reliability, so fully considering its thermal characteristics is the premise of optimal design. In order to study the thermal characteristics of high-speed motorized spindles, a coupled model of thermal-flow-structure was established. Through experiment and simulation, the thermal characteristics of spiral cooling motorized spindle are studied, and the U-shaped cooled motorized spindle is designed and optimized. The simulation results show that when the diameter of the cooling channel is 7 mm, the temperature of the spiral cooling system is lower than that of the U-shaped cooling system, but the radial thermal deformation is greater than that of the U-shaped cooling system. As the increase of the channel diameter of U-shaped cooling system, the temperature and radial thermal deformation decrease. When the diameter is 10 mm, the temperature and radial thermal deformation are lower than the spiral cooling system. And as the flow rate increases, the temperature and radial thermal deformation gradually decrease, which provides a basis for a reasonable choice of water flow rate. The maximum error between experiment and simulation is 2°C, and the error is small, which verifies the accuracy and lays the foundation for future research.

MD Simulations of Nanoparticle Thermal Conductivity and Nanoscale Thermal Contact Resistance

2007 ◽  
Author(s):  
Heng Xiang ◽  
Pei-Xue Jiang ◽  
Qi-Xin Liu
Keyword(s):  
Thermal Conductivity ◽  
Contact Resistance ◽  
Thermal Conduction ◽  
Thermal Contact Resistance ◽  
Phonon Scattering ◽  
Thermal Contact ◽  
Thermal Conductance ◽  
Md Simulations ◽  
Contact Layer ◽  
Conduction Model

The rapid progress and development of the synthesis and processing of materials with structures having nanometer length scales has created a demand for greater scientific understanding of thermal transport in nanoscale devices. Molecular dynamics (MD) simulations are emerging as a powerful tool for studying thermal conductance and phonon scattering in nanoscale objects. A thermal conduction model for spherical nanoparticles was constructed for non-equilibrium molecular dynamic (NEMD) simulations to investigate variations of the nanoparticle thermal conductivity with particle size. The results show that the nanoparticle thermal conductivity is smaller than the bulk value and that of a thin film with a thickness equal to the particle radius for the same boundary conditions. Another thermal conduction model was constructed to investigate the micro thermal contact resistance variations for various contact scenarios. These results show that the thermal contact resistance is a large part of the conduction resistance that decreases with increasing contact area and increases with increasing contact layer thickness.

scholarly journals A study of thermal behavior of the machine tool spindle

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 2117-2130 ◽  
Author(s):  
Aleksandar Zivkovic ◽  
Milan Zeljkovic ◽  
Cvijetin Mladjenovic ◽  
Slobodan Tabakovic ◽  
Zoran Milojevic ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Behavior ◽  
High Speed ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Mechanical Analysis ◽  
Thermal Imager ◽  
Accurate Analysis ◽  
Proposed Model ◽  
Machining Operations

The performances of high-speed machine tools depend not only on the speed, power, torque, dynamic and static stiffness, but also on the thermal behavior of the spindle. These parameters directly affect the productivity and quality of machining operations. This paper presents a 3-D finite element thermal model, which was based on the thermo mechanical bearing model and the numerical model of the spindle. Based on thermo mechanical analysis of bearings with angular contact, generated heat and thermal contact resistance are determined for each position of the ball. To provide the most accurate analysis possible in determining thermal contact resistance , bearings are divided into several zones based on the geometry of their cross-section. The aforementioned constraints have been applied to the 3-D FEM model which allowed for establishing temperature field distribution, and spindle thermal balance. In order to prove the efficacy of the proposed model, experimental measurements of spindle and bearing temperatures were done by using thermocouples and thermal imager.

Experimental and simulation study on the thermal characteristics of the high-speed spindle system

2016 ◽  
Vol 231 (6) ◽  
pp. 1072-1093 ◽  
Author(s):  
Chi Ma ◽  
Liang Zhao ◽  
Hu Shi ◽  
Xuesong Mei ◽  
Jun Yang
Keyword(s):  
Temperature Field ◽  
High Speed ◽  
Thermal Structure ◽  
Fractal Theory ◽  
Thermal Contact ◽  
Thermal Characteristic ◽  
Machining Accuracy ◽  
Heat Power ◽  
Spindle System ◽  
Fea Model

High-speed spindles often suffer from degeneration in its machining accuracy caused by the uneven distribution of temperature field. In order to improve the machining accuracy of high-speed spindles, a three-dimensional (3D) finite element analysis (FEA) model, which considered the combined effect of thermal contact resistance (TCR) and the change in heat power and stiffness caused by thermal displacements of bearing components on the accuracy of simulation results, was proposed to conduct transient thermal-structure analysis of high-speed spindles. The predictive model for TCR was proposed based on the fractal theory to characterize the rough surface morphology with disorder, self-affinity and non-stationary random features. And a contact mechanics model was developed to consider the influence of asperities’ deformation on TCR. The thermal-structure model of bearing was proposed to calculate the heat power and stiffness based on the quasi-static mechanics analysis. The FEA model proposed in this paper was used to simulate the temperature field distribution and thermal deformations of the high-speed spindle system. Then thermal characteristic experiments were conducted to validate the effectiveness of this model. The results showed that the FEA model was much more accurate than the traditional model which ignored the above two important factors. The temperature field and thermal errors of the spindle system were analyzed.

THERMAL CONTACT RESISTANCE MATCHING TO OPTIMIZE PERFORMANCE IN THERMOELECTRIC GENERATORS

2020 ◽  
Vol 27 (7) ◽  
pp. 617-627
Author(s):  
Yuanyuan Tian ◽  
Mengjun Zhang ◽  
Junli Wang ◽  
Anbang Liu ◽  
Huaqing Xie ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Thermoelectric Generators
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