scholarly journals Thermal behaviour in CNC machine-tools

2020 ◽  
Vol 10 (2) ◽  
pp. 5-10
Author(s):  
Sebastian Cabezas ◽  
Attila Szilágyi
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Machine Tools ◽  
External Heat ◽  
Cnc Machine Tools ◽  
Heat Sources ◽  
Cnc Machine ◽  
Thermal Errors ◽  
Basic Concepts

This article describes errors in machine-tools focusing on thermal errors. The internal and external heat sources in machine tools. The basic concepts of heat transfer and an introduction to Finite Element Method FEM applied to heat transfer.

Study on the Thermal Errors of CNC Machine Tools

2012 ◽  
Vol 472-475 ◽  
pp. 2918-2921
Author(s):  
Hong Qi Luo ◽  
Yue Hua Lai
Keyword(s):  
Machine Tools ◽  
Thermal Deformation ◽  
Thermal Error ◽  
External Heat ◽  
Cnc Machining ◽  
Cnc Machine Tools ◽  
Heat Sources ◽  
Cnc Machine ◽  
Thermal Errors ◽  
Machining Errors

Thermal deformation is produced by heat sources in CNC machine tools. Thermal error is one of the main parts in CNC machining errors. The internal and external heat sources were introduced. The research status about thermal errors was analyzed, including identification of thermal sensitive points, precaution against thermal errors and error compensation. Finally, thermal error models were summarized and discussed.

Study on Thermal Errors of High Speed Motorized Spindle on 5-Axis CNC Machine Tools

2009 ◽  
Vol 626-627 ◽  
pp. 411-416 ◽  
Author(s):  
Z.C. Wang ◽  
X.L. Hu ◽  
C.H. Zhang
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Axial Direction ◽  
Cnc Machine Tools ◽  
Heat Sources ◽  
Cnc Machine ◽  
Motorized Spindle ◽  
One Dimensional ◽  
Thermal Errors ◽  
The Relationship

A simplified one-dimensional model, accounting for thermal errors related to high speed spindle of 5-axis CNC machine tools, is developed, and the relationship between heat sources of rotating spindle and thermal deformation in axial direction is found with the help of Fourier’s law for heat transfer under two different boundary conditions. Based on the theory of homogeneous coordinate transformation in robotic, the transformation matrixes between the coordinate system of kinematic pairs and the relationship between errors and compensations are obtained, through which the compensation of thermal errors in high speed motorized spindle is obtainable.

Optimization Design and Structure Design of Precision CNC Machine

2016 ◽  
Vol 835 ◽  
pp. 605-608
Author(s):  
Xiao Ran Ye
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tools ◽  
Optimization Design ◽  
Structure Design ◽  
Machine Design ◽  
Cnc Machine Tools ◽  
Static Stiffness ◽  
Cnc Machine ◽  
Static And Dynamic Characteristics

In this paper, finite element method was used to carry out parameter optimization and structural improvements of CNC machine. Considering the static and dynamic characteristics of the machine, the headstock and bed of CNC machine has been improved by structural optimizationk, and wall ribs was designed on the headstock CNC machine tools. After optimized the static stiffness and strength of CNC machine can meet the requirements, with a decrease of approximately 24.8% in weight compared to the original machine design.

scholarly journals Influence of external heat sources on volumetric thermal errors of precision machine tools

2018 ◽  
Vol 99 (1-4) ◽  
pp. 475-495 ◽  
Author(s):  
Lingtao Weng ◽  
Weiguo Gao ◽  
Zhanshan Lv ◽  
Dawei Zhang ◽  
Teng Liu ◽  
...  
Keyword(s):  
Machine Tools ◽  
External Heat ◽  
Heat Sources ◽  
Thermal Errors ◽  
Precision Machine ◽  
Precision Machine Tools

scholarly journals Thermal Errors Classification Compensation without Sensor for CNC Machine Tools

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Xian Wei ◽  
Feng Gao ◽  
Yan Li ◽  
Dongya Zhang
Keyword(s):  
Theoretical Model ◽  
Machine Tools ◽  
Prediction Models ◽  
Rotational Velocity ◽  
Thermal Error ◽  
Temperature Sensors ◽  
Cnc Machine Tools ◽  
Error Prediction ◽  
Cnc Machine ◽  
Thermal Errors

Both multicollinearity and utilization deficiency of temperature sensors affect the robustness and the prediction precision of traditional thermal error prediction models. To address the problem, a thermal error prediction model without temperature sensors is proposed. Firstly, the paper analyzes the temperature field and thermal deformation mechanisms of the spindle of a CNC gear grinding machine in accordance with the parameters, efficiencies, and structures of the machine spindle and bearing. A preliminary theoretical model is established on the basis of the mechanism analysis. Secondly, the theoretical model is corrected according to the actual operation parameters of the machine. Thirdly, verification experiments are carried out on machine tools of the same type. It is found that the corrected model has higher precision in predicting thermal errors at the same rotational velocity. The standard deviation and the maximum residual error are reduced by at least 39% and 48% separately. The prediction precision decreases with the increase in prediction range when predicting thermal errors at different rotational velocities. The model has high prediction precision and strong robustness in the case of reasonable prediction range and classified prediction. In a word, prediction precision and robustness of the model without temperature sensors can be effectively ensured by reasonably determining the prediction range and practicing classified prediction and compensation for thermal errors at different rotational velocities. The model established can be applied to machine tools that have difficulties in arranging sensors or those whose sensors are significantly disturbed.

Thermal Deformation Finite Element Analysis for the Ram of Heavy-Duty CNC Machine Tools

2012 ◽  
Vol 433-440 ◽  
pp. 7159-7164 ◽  
Author(s):  
Yong Lu ◽  
Gang Wei Cui ◽  
Dong Gao ◽  
Heng Chao Xiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tools ◽  
Thermal Deformation ◽  
Theoretical Data ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Element Analysis

The thermal deformation of ram system in a heavy-duty CNC milling-boring machine tool has a serious effect on its accurateness. This paper analyses quantificationally the temperature field and deformation field of the ram system, and gives the ram’s heat sources, calculating quantity of heat and transferring type of heat. And then a finite element analysis is performed, the analyzing results provide basic theoretical data for thermal error compensation in machine tools.

Thermal Deformation Errors Compensation System of Machine Tools

2011 ◽  
Vol 201-203 ◽  
pp. 1657-1661
Author(s):  
Sheng Li ◽  
Xin Hua Yao ◽  
Jian Zhong Fu
Keyword(s):  
Machine Tools ◽  
Thermal Deformation ◽  
Compensation System ◽  
Working Time ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Thermal Errors ◽  
Compensation Process ◽  
Part Modeling

This research presents a design of a thermal deformation errors compensation system for CNC machine tools which can compensate thermal deformation of Z-axis during the working time. The thermal deformation errors compensation system includes three instruments: displacement tester, temperature tester and thermal errors compensator. Displacement and temperature testers have been designed in the early researches, and the thermal errors compensator is designed in this research. The compensation process includes two parts, modeling part and compensation part. Modeling part focuses on making a model of thermal deformation, and compensation part focuses on using the model to compensate the thermal deformation of Z-axis during the working time.

Sign in / Sign up

Export Citation Format

Share Document