Thermal Error and Compensation Method for Precision Machines

2020 ◽  
pp. 459-481
Author(s):  
J. P. Xi
Keyword(s):  
Thermal Error ◽  
Compensation Method ◽  
Precision Machines

Real-time thermal error compensation method for robotic visual inspection system

2014 ◽  
Vol 75 (5-8) ◽  
pp. 933-946 ◽  
Author(s):  
Shibin Yin ◽  
Yin Guo ◽  
Yongjie Ren ◽  
Jigui Zhu ◽  
Shourui Yang ◽  
...  
Keyword(s):  
Real Time ◽  
Error Compensation ◽  
Visual Inspection ◽  
Thermal Error ◽  
Compensation Method ◽  
Inspection System ◽  
Thermal Error Compensation

RBF-based compensation method on displacement and thermal error

2013 ◽  
Author(s):  
Kok Kiong Tan ◽  
Rui Yang ◽  
Poi Voon Er ◽  
Arthur Tay ◽  
Chek Sing Teo
Keyword(s):  
Thermal Error ◽  
Compensation Method

Thermal error compensation method for machine center

2011 ◽  
Vol 59 (5-8) ◽  
pp. 681-689 ◽  
Author(s):  
Ching-Wei Wu ◽  
Chia-Hui Tang ◽  
Ching-Feng Chang ◽  
Ying-Shing Shiao
Keyword(s):  
Error Compensation ◽  
Thermal Error ◽  
Compensation Method ◽  
Machine Center ◽  
Thermal Error Compensation

Thermal Error Modelling in CNC Machines

2014 ◽  
Vol 592-594 ◽  
pp. 1815-1819 ◽  
Author(s):  
R. Jamuna ◽  
U. Natarajan
Keyword(s):  
Thermal Error ◽  
Process Variables ◽  
Volumetric Error ◽  
Simulation Experiments ◽  
Ansys Simulation ◽  
Machine Tool Accuracy ◽  
Cnc Turning Centre ◽  
Precision Machines ◽  
Thermal Error Compensation ◽  
Selection Of

Latest trend in increasing the performance characteristics of precision machines is reducing error in machines. Today research is focused on Machine tool accuracy. The effect of thermal error contributes to major part of 70% of volumetric error. The present study aims to establish a new compensation method for CNC Turning centre. Selection of proper temperature variables is a great task in thermal error compensation. In this paper 3 thermal process variables namely spindle speed; temperature and time are used to create thermal error models. Using ANSYS simulation experiments are created.

Thermal Error Compensation for a High Precision Lathe to Improve Machining Accuracy

2009 ◽  
Author(s):  
Byung-Sub Kim ◽  
Young-Chan Song ◽  
Chun-Hong Park ◽  
Jong-Kweon Park
Keyword(s):  
High Precision ◽  
Temperature Control ◽  
Error Compensation ◽  
Thermal Error ◽  
Experimental Results ◽  
Machining Accuracy ◽  
Thermal Drift ◽  
Temperature Changes ◽  
Precision Machines ◽  
Thermal Error Compensation

High precision machines require very stable operational environment: temperature control and vibration isolation. Tight temperature control for machines usually demand high cost to operate air conditioners. Some of high precision machines require the ambient temperature changes to maintain within ±0.1 degrees. In this paper, we present a thermal error compensation scheme and experimental results for improving machining accuracy of a high precision lathe. The testbed lathe has X- and Z-axes and they are driven by linear motors and hydrostatic oil bearing. Due to the temperature changes of the ambient air and supplied oil to the hydrostatic bearing, thermal deformation is generated and measured to be as much as 200–300 nanometers. To identify the dynamic relations between the temperature changes and the thermal drift, a state-space model is used in which state variables are constructed from the input measured temperatures and the output thermal drift data. The identified model is implemented in a servo control loop and the predicted thermal error is compensated by subtracting the predicted thermal drift from the servo command. In our simulation, a thermal error of 97 nanometers RMS over 3 hours is reduced to 55 nanometers RMS. Experimental results show an average of 24% reduction in thermal drift and support the validity of our approach.

scholarly journals Comprehensive compensation method for thermal error of vertical drilling center

2019 ◽  
Vol 43 (1) ◽  
pp. 92-101 ◽  
Author(s):  
Cheng Ming Kang ◽  
Chun Yu Zhao ◽  
Kuo Liu ◽  
Tie Jun Li ◽  
Bo Yang
Keyword(s):  
Error Compensation ◽  
Thermal Error ◽  
Dimensional Accuracy ◽  
Experimental Tests ◽  
Compensation System ◽  
Compensation Method ◽  
Machining Accuracy ◽  
Thermal Displacement ◽  
Thermal Tests ◽  
Thermal Growth

To eliminate the influence of thermally induced error from a machine tool on machining accuracy, a comprehensive error compensation method for thermal displacement of the screw shaft and spindle is put forward. Based on a heat transfer mechanism and experimental analysis, a model of screw thermal expansion error is built. Modeling of spindle thermal growth that depends on speed variations is also proposed. Thermal tests for studying thermal behavior of the spindle and screw axis are carried out on the vertical drilling center TC500R. Finally, the compensation effect of the robust model is validated via experimental tests and machining. Experimental results show that thermal displacement variations are controlled within 2 μm when the compensation system is activated. The suggested model can achieve high accuracy and good applicability in different moving states. Machining results indicate that dimensional accuracy of the workpiece is significantly improved after implementation of compensation. Feasibility of the thermal error compensation system is satisfactory in applications for drilling operations.

The Adaptive Compensation Method and Modeling of Gear Hobbing Machine Based on Numerical Control System

2011 ◽  
Vol 422 ◽  
pp. 858-863
Author(s):  
Shi Long Wang ◽  
Shuai Yang ◽  
Jie Zhou
Keyword(s):  
Control System ◽  
Error Compensation ◽  
Thermal Error ◽  
Compensation Method ◽  
Least Square ◽  
Numerical Control ◽  
Numerical Control System ◽  
Adaptive Compensation ◽  
Gear Hobbing ◽  
Thermal Error Compensation

Thermal error is the main factor which affects the precision of gear hobbing. The paper discusses the individual feature of gear hobbing machine of thermal error, and uses the weighted grey correlativity to determine the key thermal error source of gear hobbing machine. Based on Least-square method, a fundamental model of thermal error compensation was constructed. An adaptive correction algorithm of thermal error compensation model on gear hobbing machine was proposed. An adaptive compensation method of thermal error on gear hobbing machine was given based on open numerical control system.

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