The Testing and Finite Element Analysis of Temperature Distribution and Thermal Deformation in Vertical Machining Center

2012 ◽  
Vol 538-541 ◽  
pp. 730-734
Author(s):  
Bing Fang ◽  
Lei Zhang ◽  
Jian Fu Zhang ◽  
Ya Hong Li
Keyword(s):  
Temperature Distribution ◽  
Contact Resistance ◽  
Thermal Deformation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Measuring Method ◽  
Temperature Fields ◽  
Element Analysis ◽  
Fea Model ◽  
Machining Center

This paper presented a real-time measuring method of temperature fields and thermal deformations in vertical machining center. And a FEA model including the thermal contact resistance at interface for evaluating the temperature distribution and tools deformation in vertical machining center (VMC) was established. Compared with the experiment results, it is shown that the new model is much more accurate than the traditional model without considering thermal contact resistance at interface.

The Steady-State Thermal Characteristics Analysis of Precise Composite Grinding Machine

2011 ◽  
Vol 338 ◽  
pp. 241-244
Author(s):  
Hong Lin Zhao ◽  
Rui Chen ◽  
Yu Mei Huang ◽  
Guang Peng Zhang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Deformation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Thermal Characteristics ◽  
Numerical Control ◽  
Deformation Analysis ◽  
Characteristics Analysis ◽  
Grinding Machine ◽  
The Impact

It is commonly used method to analyze the overall thermal characteristics of mechanical structure without considering the thermal contact resistance of components. But in terms of precision composite grinding machine, the impact of thermal contact resistance can not be ignored. On the basic of thermal contact resistance characteristics, this article gives the concept and empirical value of the equivalent area factor. By calculating the equivalent contact coefficient, the thermal contact resistance characteristics were integrated into the grinder simulation. According to the structure and processing characteristics of grinder, grinding machine was analyzed in two parts respectively to get the pattern of temperature rise and thermal deformation. Analysis shows the impact that thermal deformation has on working accuracy, so as to provide basis to the compensation of numerical control system to improve the working accuracy.

Effect of Thermal Contact Resistance on Alumina Molten Particle Impacting onto a Metal Substrate

2012 ◽  
Vol 326-328 ◽  
pp. 482-487 ◽  
Author(s):  
S. Oukach ◽  
Bernard Pateyron ◽  
H. Hamdi ◽  
M. El Ganaoui
Keyword(s):  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Droplet Diameter ◽  
Thermal Contact ◽  
Thermal Spraying ◽  
Droplet Spreading ◽  
Element Analysis ◽  
Molten Droplet ◽  
Molten Droplets ◽  
Droplet Sizes

In this paper, a Finite Element Analysis is carried out in order to simulate the process of spreading and solidification of a micrometric molten droplet impinging onto a cold substrate. This process is a crucial key to have a good understanding of coatings obtained by means of thermal spraying. The effect of thermal contact resistance (TCR) on the droplet spreading and solidification was investigated using different values of TCR and different droplet sizes. The solidification time was found to be a linear function of the droplet diameter square. Viscous dissipation, wettability and surface tension effects are taken into account. The Level Set method was employed to explicitly track the free surface of molten droplets.

Nonlinear Thermoelastic Behavior of Structural Joints—Solution to a Missing Link for Prediction of Thermal Deformation of Machine Tools

1979 ◽  
Vol 101 (3) ◽  
pp. 348-354 ◽  
Author(s):  
M. H. Attia ◽  
L. Kops
Keyword(s):  
Heat Transfer ◽  
Contact Resistance ◽  
Contact Pressure ◽  
Thermal Deformation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Structural Elements ◽  
Nonlinear Load ◽  
Missing Link ◽  
Dependent Form

The analysis of the process of heat transfer across the joints in machine tool structures reveals their non-linear thermoelastic behavior. Nonlinearity basically results from two distinctive causes. First, it is the material nonlinearity due to the fact, that the stiffness of the surface asperities takes a nonlinear, load-dependent form. The second cause is the nonlinearity resulting from the thermoelastic behavior of contacting elements, which experience a closed-loop interaction between the thermal field and the thermal deformation of structural elements in contact. This interaction affects the distribution of the contact pressure along the joint and causes a consequent redistribution of the thermal contact resistance. As a result, the final pattern of deformation depends on the final contact pressure distribution which is unknown in advance. The nonlinear thermoelastic behavior of the joint is inherent to the process of heat transfer across the interface. By considering this behavior of the joint, characterized by the time-dependent distribution of the thermal contact resistance along the interface, thermal deformation of the whole structure can be treated with thermally interacting structural elements taken into account. This was a missing link in predicting the thermal deformation. As a solution, a consecutive-iteration technique is proposed, which, with introduction of contact elements representing equivalent properties of the joint, allows us to portray the thermal deformation of the structure under transient and steady state conditions.

scholarly journals Effects of contact pressure and interface temperature on thermal contact resistance between 2Cr12NiMoWV/BH137 and γ-TiAl/2Cr12NiMoWV interfaces

2020 ◽  
Vol 24 (1 Part A) ◽  
pp. 313-324
Author(s):  
Yuwei Liu ◽  
Yameng Ji ◽  
Fuhao Ye ◽  
Weizheng Zhang ◽  
Shujun Zhou
Keyword(s):  
Contact Resistance ◽  
Contact Pressure ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Temperature Fields ◽  
Maximum Temperature ◽  
Interface Temperature ◽  
Ambient Atmosphere ◽  
Heat Resistant Steel ◽  
Steady State Temperature

Thermal contact resistance between interfaces is an important parameter in the analysis of temperature distribution for structural components. Thermal contact resistance between heat resistant steel 2Cr12NiMoWV/aluminum alloy BH137 interfaces and 2Cr12NiMoWV/titanium alloy ?-TiAl interfaces were experimentally investigated in the present paper. The effects of contact pressure and interface tem-perature were detailed. The temperature of contacting surfaces was from 80- 250?, and the contact pressure ranged from 2-17 MPa. All experiments were conducted in ambient atmosphere. Results showed that thermal contact resistance decreases with an increment of interface temperature or contact pressure. Under the same conditions of contact pressure and interface temperature, thermal contact resistance between 2Cr12NiMoWV and BH137 interfaces is lower than that between 2Cr12NiMoWV and ?-TiAl interfaces. The temperature dependence of thermal conductivity and mechanical properties was analyzed to explain the results. Furthermore, with the piston and piston pin as the research object, steady state temperature fields were simulated in cases of considering thermal contact resistance and without considering thermal contact resistance, respectively. The results showed that the maximum temperature of the piston pin will be lower when thermal contact resistance is considered.

The effect of thermal contact resistance on the temperature distribution in a WC made cutting tool

2019 ◽  
Vol 45 (17) ◽  
pp. 22196-22202 ◽  
Author(s):  
Milad Sakkaki ◽  
Farhad Sadegh Moghanlou ◽  
Mohammad Vajdi ◽  
FatemehZahra Pishgar ◽  
Mohammadreza Shokouhimehr ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Cutting Tool ◽  
Thermal Contact
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