scholarly journals Thermal Characteristics Analysis for Motorized Spindle System of CNC Machining Center

2019 ◽  
Vol 257 ◽  
pp. 02003
Author(s):  
Xiaolei Deng ◽  
Xinghui Zhang ◽  
Mucheng Zhang ◽  
Yibo Zhou ◽  
Huan Lin ◽  
...  
Keyword(s):  
Thermal Characteristics ◽  
Thermal Error ◽  
Cnc Machining ◽  
Transfer Coefficients ◽  
Motorized Spindle ◽  
Element Analysis ◽  
Spindle System ◽  
Heat Transfer Coefficients ◽  
Machining Center ◽  
Characteristics Analysis

Based on the comprehensive analysis of the heat sources of the motorized spindle system, the thermal loads, including the heat generation of bearing friction and the electromagnetic loss of the built-in motor, are carried out for a machining center motorized spindle system. And then, the convective heat transfer coefficients of the whole spindle system are analyzed. The thermal characteristics of the motorized spindle system are calculated by finite element analysis. The steady state temperature field distribution of the motorized spindle is obtained. It provides some references for improving the thermal characteristics of the motorized spindle and reducing the difficulty of thermal error compensation.

Thermal Error Measurement, Modeling and Compensation for Motorized Spindle and the Research on Compensation Effect Validation

2014 ◽  
Vol 889-890 ◽  
pp. 1003-1008 ◽  
Author(s):  
Yu Qing Fu ◽  
Wei Guo Gao ◽  
Jin Yu Yang ◽  
Qing Zhang ◽  
Da Wei Zhang
Keyword(s):  
Compensation Effect ◽  
Great Influence ◽  
Thermal Characteristics ◽  
Thermal Error ◽  
Shift Function ◽  
Linear Regression Method ◽  
Motorized Spindle ◽  
Verification Method ◽  
Machining Center ◽  
Thermal Error Model

The motorized spindle is a primate part of the machine tool and its thermal characteristics have great influence on the accuracy of the machine tools. The thermal errors of the spindle of a certain type of precision horizontal machining center were measured with PLC acquisition system. By multivariate linear regression method, the axial thermal error model was built. Online real-time error compensation was implemented by applying the FANUC 18i CNC system external machine coordinate system shift function. A verification method was proposed which include three steps: model validation, compensation validation and experimental machining verification. The accuracy of the model was 84.1%, 64.9% and 49.4% respectively. The quantitative analysis results showed the precision was effectively improved and the compensation method was reliable.

Spindle System Dynamic Characteristics Analysis of Vertical Gantry Machining Center

2013 ◽  
Vol 456 ◽  
pp. 286-290
Author(s):  
Hong Bing Huang ◽  
Yong Ming Wang ◽  
Shuai Xia
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Element Model ◽  
Motorized Spindle ◽  
Spindle System ◽  
Machining Center ◽  
Object Based ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis ◽  
The Finite Element Model

With the spindle system of a vertical gantry machining center as the research object, based on the vibration theory and finite element method, the modal analysis of spindle system is studied. Firstly, the finite element models of the mandrel box body and motorized spindle frame of spindle system are established by ANSYS. And then do the modal analysis of singleton in the boundary of free constraint. Lastly, based on the analysis results to establish the finite element model of the whole spindle system and do the modal analysis of the whole system which under constraint condition. The result shows that the swing of motorized spindle frame and motorized spindle sleeve of spindle system are more obvious.

Finite Element Analysis on Thermal Characteristics of Lathe Motorized Spindle

2011 ◽  
Vol 311-313 ◽  
pp. 2434-2439 ◽  
Author(s):  
Ping Ma ◽  
Biao Zhou ◽  
Hai Peng Li
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
High Speed ◽  
Thermal Characteristic ◽  
Thermal Characteristics ◽  
Internal Heat ◽  
Transfer Coefficients ◽  
Motorized Spindle ◽  
Element Analysis ◽  
Spindle Unit

Abstract．High-speed motorized spindle is a promising technology widely used in high speed machining．The lathe motorized spindle is the key component of the high speed NC lathe and the thermal characteristics of the lathe motorized spindle is one of the major factors influencing the performance of the machine tools．In order to improve the accuracy and reliability of the high speed NC lathe，the thermal characteristic of the high speed NC motorized spindle has been studied in this paper．Firstly，the structure feature of the spindle has been introduced and two major internal heat sources of motorized spindle have been investigated．Secondly，the heat transfer coefficients of the major components of the lathe spindle have been conducted．Then，the 2D temperature field model has been developed with finite element method．Based on it, the temperature field and temperature rises of the spindle have been simulated and the reasonability of temperature distribution of the spindle unit has also been discussed．The research results provide the reference to evaluate of the thermal behavior of the high speed NC motorized spindle．

Finite Element Analysis of Thermal Characteristics of High-Speed Motorized Spindle

2007 ◽  
Vol 10-12 ◽  
pp. 258-262 ◽  
Author(s):  
Y. Lu ◽  
Ying Xue Yao ◽  
R.H. Hong
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Temperature Rise ◽  
High Speed ◽  
Thermal Characteristics ◽  
Motorized Spindle ◽  
Element Analysis ◽  
Thermal Deformations ◽  
Characteristics Analysis ◽  
High Speed Machine

Motorized spindle is one of the core parts of high-speed machine tool, to a great extent, its thermal characteristics determine the thermal stress and thermal deformations, therefore the research on thermal characteristics is of great significance to increase the accuracy of high-speed machine tool. In this paper, the heat generation developed in the built-in motor and the bearings is calculated. The motorized spindle is modeled and its thermal characteristics analysis by finite element method is done using ANSYS software, in the foundation of analyzing its configuration and heat transfer. The variation regularity of its temperature-rise and temperature field is also summarized. Thereby it provides a powerful theoretical basis for reducing temperature–rise, calculating thermal deformations and improving working conditions.

Modeling and Estimating Thermal Error in Precision Machine Spindles

2010 ◽  
Vol 34-35 ◽  
pp. 507-511 ◽  
Author(s):  
Jian Han ◽  
Li Ping Wang ◽  
Lian Qing Yu
Keyword(s):  
Finite Element ◽  
Thermal Deformation ◽  
Thermal Structure ◽  
Thermal Characteristics ◽  
Thermal Error ◽  
Transient Temperature ◽  
Axial Deformation ◽  
Analysis Model ◽  
Element Analysis ◽  
Spindle System

Thermal induced errors are significant factors that affect machine tool accuracy. The deformation of spindle is the main contributor to thermal error. In this paper, the thermal characteristics of the spindle system are investigated. Taking into account the coupling of elastic deformation and temperature, the heat conduction of the spindle system is modeled. The heat of bearings and heat transfer coefficient, and boundary conditions of the spindle are determined. Based on the numerical results, an iterative model of spindle's temperature and thermal deformation are acquired under the actions of thermal loads using the finite element method. Taking the spindle of precision boring machine with some reasonable assumptions and simplicities as an example, the finite element analysis model of spindle thermal characteristics is analyzed with virtual prototyping, and the static/transient temperature field and thermal-structure field are calculated using ABAQUS software. The characteristics of heat flow and thermal deformation within the spindle are analyzed according to the simulation results. The research results provide a theoretical foundation for reasonable arrangement and optimal design to reduce radial and axial deformation of the spindle head, temperature controlling, and the error compensation to the precision machining tool.

Thermal Characteristics Analysis and Engineering Application of Machining Center Ram Based on ABAQUS

2013 ◽  
Vol 694-697 ◽  
pp. 762-766 ◽  
Author(s):  
Pan Luo ◽  
Zhong Ping Hua ◽  
Shui Sheng Chen ◽  
Chen Dai
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Engineering Application ◽  
Thermal Characteristics ◽  
Thermal Error ◽  
Axial Direction ◽  
Element Model ◽  
Machining Center ◽  
Characteristics Analysis ◽  
The Finite Element Model

This paper establishes the finite element model of XK2535 gantry machining center ram structure, and considers the influence of bearing to the slippery pillow in the axial direction to analyzes the rams temperature field and thermal deformation based on ABAQUS. Finally using SINUMERIK 840D is to compensating thermal error of the ram.

Experimental Platforms and Finite Element Analysis on Hot Stamping Processes

2014 ◽  
Vol 1063 ◽  
pp. 334-338 ◽  
Author(s):  
Tzu Hao Hung ◽  
Heng Kuang Tsai ◽  
Fuh Kuo Chen ◽  
Ping Kun Lee
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Process Design ◽  
Hot Stamping ◽  
Boron Steel ◽  
Transfer Coefficients ◽  
Element Analysis ◽  
Heat Transfer Coefficients ◽  
The Finite Element Analysis

Due to the complexity of hot stamping mechanism, including the coupling of material formability, thermal interaction and metallurgical microstructure, it makes the process design more difficult even with the aid of the finite element analysis. In the present study, the experimental platforms were developed to measure and derive the friction and heat transfer coefficients, respectively. The experiments at various elevated temperatures and contact pressures were conducted and the friction coefficients and heat transfer coefficients were obtained. A finite element model was also established with the experimental data and the material properties of the boron steel calculated from the JMatPro software. The finite element simulations for the hot stamping forming of an automotive door beam, including transportation analysis, hot forming analysis and die quenching analysis were then performed to examine the forming properties of the door beam. The validation of the finite element results by the production part confirms the efficiency and accuracy of the developed experimental platforms and the finite element analysis for the process design of hot stamping.

Experimental Analysis and FEM Calculation of the Thermal Deformation for the Spindle System of Machining Center

2008 ◽  
Vol 33-37 ◽  
pp. 1307-1312
Author(s):  
Mutellip Ahmat ◽  
Wei Cheng ◽  
Li Zheng
Keyword(s):  
Error Compensation ◽  
Thermal Deformation ◽  
Thermal Field ◽  
Theoretical Foundation ◽  
Thermal Error ◽  
Experimental System ◽  
Heat Sources ◽  
Fem Modeling ◽  
Spindle System ◽  
Machining Center

In this study, the chief heat sources of the spindle system for the TH6350 Machining Center are analyzed, and an experimental system based on the virtual instruments technology is presented, thirty-two thermocouple sensors are set at the spindle system of the machining center to measure the thermal field, and five electric vortex sensors are used to measure the thermal error of the spindle by five-point method. The FEM modeling of the thermal deformation of the spindle system is built up by based of I-DEAS, the temperature field and the thermal deformation of it are calculated, and the calculated values of the model tallies with the experimental values.The researching results provide a theoretical foundation for the improving design􀋈temperature controlling and the error compensation to the machining center.

scholarly journals MODERNIZUOTŲ DAUGIABUČIŲ NAMŲ MIKROKLIMATO RODIKLIŲ IR ATITVARŲ ŠILUMINIŲ CHARAKTERISTIKŲ TYRIMAS / ANALYSIS OF MICROCLIMATE INDICATORS AND THERMAL CHARACTERISTICS OF ENVELOPE OF RESIDENTIAL MULTI-STOREY BUILDINGS

2018 ◽  
Vol 10 (0) ◽  
pp. 1-6
Author(s):  
Juozas Bielskus ◽  
Giedrius Šiupšinskas
Keyword(s):  
Air Quality ◽  
Thermal Characteristics ◽  
Weighted Average ◽  
Co2 Concentration ◽  
Transfer Coefficients ◽  
Significant Discrepancy ◽  
Heat Transfer Coefficients ◽  
Heat Demand ◽  
Improvement Measures ◽  
Air Quality Improvement

The purpose of the study was to analyse the thermal characteristics of the microclimate parameters and envelope of the renovated 12 residential multi-storey buildings by assessing their impact on heat savings. The relevance of this work is related to a significant discrepancy between the theoretically simulated / estimated heat savings after the renovation and the actual measured values of heat meters. After the statistical analysis of the accumulated data, the average indoor temperature of the premises, relative humidity, and CO2 concentration were determined, and the distribution of frequency was assessed. The heat transfer coefficients of the walls, window glasses and window frames, measured according to the manufacturer’s recommended methodology, are reviewed in this work. The results are compared with the current requirements for microclimate. The results revealed that in the investigated buildings after the renovation the weighted average temperature of the premises was higher than the temperature under standard conditions, but the air quality (CO2 concentration) was insufficient. The air quality improvement measures increase heat demand and reduce the expected heat savings. Santrauka Tyrimo tikslas buvo atlikti modernizuotų 12 daugiabučių namų mikroklimato rodiklių ir atitvarų šiluminių charakteristikų analizę įvertinant jų įtaką sutaupytam šilumos kiekiui. Darbo aktualumas susijęs su pastebimu neatitikimu tarp teoriškai sumodeliuoto ar apskaičiuoto sutaupyto šilumos kiekio po modernizavimo ir faktinių užfiksuotų skaitiklių reikšmių. Darbe atlikus sukauptų duomenų statistinę analizę buvo nustatyta vidutinė patalpų vidaus temperatūra, santykinis drėgnis, CO2 koncentracija bei įvertintas reikšmių pasiskirstymo dažnis. Aptarti pagal gamintojų rekomenduojamą metodiką matuotų sienų, lango paketo ir lango rėmo šilumos perdavimo koeficientai. Gauti rezultatai palyginti su šiuo metu galiojančiais mikroklimatui keliamais reikalavimais. Rezultatai atskleidė, kad tirtuose pastatuose po modernizavimo patalpų svorinė vidutinė temperatūra buvo aukštesnė nei norminė, tačiau oro kokybė yra nepakankama. Oro kokybės gerinimo priemonės didina šilumos poreikį ir mažina tikėtiną sutaupytos šilumos kiekį.

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