Measurement Error Analysis of Spindle Thermal Deformation

2011 ◽  
Vol 697-698 ◽  
pp. 229-234
Author(s):  
Xiang Yang Qi ◽  
Wei Guo Gao ◽  
Da Wei Zhang ◽  
Liang Yu Cui ◽  
Hong Jie Zhang
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Thermal Deformation ◽  
Thermal Field ◽  
Theoretical Foundation ◽  
Stable State ◽  
Machining Accuracy ◽  
System Error ◽  
The Difference ◽  
Precision Machine Tools

In the high speed precision machine tools, the thermal deformation of spindle had an important influence in machining accuracy. The data of thermal deformation of spindle was got through measuring test rod in the experiment. However, the system error existing of test rod in running and heat imported led to the difference between the measured values and the actual values. The paper has discussed the deformation of test rod caused by centrifugal force in high speed, Non-uniform thermal field in a stable state, and gravity and the variational elastic modulus. Through analyzing those factors, the main ones and neglectable ones could be confirmed, which laid the theoretical foundation in order to eliminate the interference factors in the measurement values.

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.

An experimental study on the cryogenic face seal at different inlet pressures

2019 ◽  
Vol 234 (9) ◽  
pp. 1470-1481
Author(s):  
Guoyuan Zhang ◽  
Yangyang Zhao ◽  
Weigang Zhao ◽  
Xiutian Yan ◽  
Maotan Liang
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
High Speed ◽  
Fluid Pressure ◽  
Stable State ◽  
Test System ◽  
Leakage Rate ◽  
Mechanical Seals ◽  
Closing Force ◽  
The Difference

An experimental test system for cryogenic high-speed hydrodynamic non-contact mechanical seals is developed. Based on this system, the performances of seals under different working conditions are studied in detail in this paper. With the experimental results, the main performances of the seals (such as inlet and outlet temperatures, separated speed, face temperature, friction force, friction coefficient, leakage rate) are obtained, and the relationships of the performances with the inlet fluid pressure, the closing force and the rotational speed are discussed. The results show that the difference between the outlet and inlet temperatures decreases with increasing inlet fluid pressure. As the speed increases, the friction force varies little and remains at a constant value. The friction coefficient of the seal is approximately 0.12 and basically does not change with the speed. The leakage rate is also maintained at approximately 190 g/s. With the increase in the closing force, the friction at the seal’s face does not change greatly, which indicates that the friction at the face is always in a stable state with the seal’s closing force.

Current Development and Countermeasure of Ultra-Precision Machine Tools

2010 ◽  
Vol 455 ◽  
pp. 632-636
Author(s):  
R.J. Song ◽  
J.L. Niu ◽  
Dong Hai Chen
Keyword(s):  
Machine Tools ◽  
Precision Machining ◽  
Machining Accuracy ◽  
Current Development ◽  
Factors Influencing ◽  
Precision Machine ◽  
Ultra Precision ◽  
Precision Machine Tools

Ultra-precision machine tools is an important machinery equipment to implement ultra-precision machining. Current development and the trend of the ultra-precision machine tools was analyzed. The factors influencing machining accuracy were pointed out from the viewpoint of system. Some suggestions were put forward on the domestic development and research of the ultra-precision machine tools.

Energy Efficiency and Performance Optimized Control of a Hybrid Feed Drive

2015 ◽  
Author(s):  
Molong Duan ◽  
Chinedum E. Okwudire
Keyword(s):  
Energy Efficiency ◽  
Machine Tools ◽  
High Speed ◽  
Control Strategies ◽  
Electrical Energy ◽  
Motor Drives ◽  
Precise Positioning ◽  
Feed Drive ◽  
And Performance ◽  
Precision Machine Tools

Linear motor drives (LMDs) are well known to provide significant advantages in terms of positioning speed and precision over traditional screw drives (SDs), making them better suited for high-speed, high-precision machine tools. However, their use in such machine tools is limited by their tendency to consume a lot of electrical energy and cause thermal issues that help drive up costs. A hybrid feed drive (HFD) has been proposed as a possible solution to this dilemma. The HFD combines LMD and SD actuation to achieve speeds and accuracies similar to LMDs while consuming much less energy. This paper explores control strategies to further improve the performance of the HFD without unduly sacrificing its efficiency. First, it highlights two performance limitations of the controller proposed for the HFD in prior work, namely, imperfect tracking and suboptimal feedback gains. Then it compares two approaches for achieving perfect tracking with regard to performance and energy efficiency. Finally, it presents an approach for optimizing the feedback gains of the HFD to achieve the best positioning performance. Simulations and experiments are used to demonstrate significant gains in precise positioning using the methods proposed in this paper, while maintaining superb energy efficiency relative to an equivalent LMD.

Failure Mode Analysis for High-Speed Motorized Spindle of NC Machine Tools

2014 ◽  
Vol 623 ◽  
pp. 85-89
Author(s):  
Yu An He ◽  
Yan Ming He
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Failure Modes ◽  
Fault Tree ◽  
Mode Analysis ◽  
Machining Accuracy ◽  
High Speed Machining ◽  
Motorized Spindle ◽  
Nc Machine ◽  
Nc Machine Tools

High-speed motorized spindle of NC machine tools is the core component for high speed machining. Production efficiency, machining accuracy, processing quality are greatly improved, and production cost is reduced by high speed machining. The paper describes the common failure modes of high-speed motorized spindle. By the fault tree analysis method, failure modes of motorized spindle are modeled, and the main fault reasons of motorized spindle for NC machine tools are gotten. Qualitative analysis is performed for the fault tree by the mean of the structure function. At the end of this paper, the minimal cut sets which are the main sets of failure modes are all obtained. It has laid a good foundation for further study of quantitative analysis of motorized spindle failure modes.

A Study of High-Speed Angular Contact Ball Bearing Thermo-Mechanical Coupling Characteristics

2013 ◽  
Vol 397-400 ◽  
pp. 131-134
Author(s):  
Chun Li Lei ◽  
Zhi Yuan Rui ◽  
Bao Cheng Zhou ◽  
Jing Fang Fang
Keyword(s):  
Contact Stress ◽  
High Speed ◽  
Thermal Deformation ◽  
Ball Bearing ◽  
Contact Region ◽  
Element Model ◽  
Machining Accuracy ◽  
Angular Contact Ball Bearing ◽  
Mechanical Coupling ◽  
Coupling Characteristics

Heat generation and deformation of bearing are key factors that influence the rigidity and machining accuracy of the high-speed precision spindle system. Based on heat transfer and thermodynamics, the finite element model of angular contact ball bearing is established for thermal deformation. The contact stress and thermal deformation are analyzed and obtained at a speed of . The results show that the maximum contact stress and thermal deflection appeared at contact region, which is in accordance with actual status. The results provide the reference and the theory basis for research into thermal deformation of bearing.

Tracking Error Transform in Parallel Kinematic Machining

2010 ◽  
Vol 450 ◽  
pp. 585-588
Author(s):  
Ghasem Amirian ◽  
Christian Schenck ◽  
Bernd Kuhfuss
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Tracking Error ◽  
Contour Error ◽  
Machining Accuracy ◽  
Tracking Errors ◽  
High Productivity ◽  
Machine Errors ◽  
Parallel Kinematic ◽  
Servo Tracking

Parallel kinematic machine tools (PKM) are developed to increase dynamic parameters for high speed and high accuracy machining to gain short lead times and high productivity. One of the most important components of machine tools is the numerical controller (NC). Most NCs are organized in a cascaded structure, comprising the position, velocity and current loops. Commonly applied servo controllers generate tracking errors in each axis. These tracking errors are a significant factor that affects machining accuracy, beside geometric machine errors, vibrations, temperature changes and tool errors. In this paper the contour error originated from servo tracking controller in Cartesian kinematic machine tools (CKM) with perpendicular arranged machine axes and PKM is presented. The effects of the forward transformation of the tracking errors in PKM are addressed with experiment and simulation results. The servo tracking effect on trace accuracy is discussed by a tripod mechanism and radial deviations are measured with double ball bar method (DBB).

Analysis and Optimization of Thermal Characteristics for NC Lathe Spindle System

2011 ◽  
Vol 341-342 ◽  
pp. 291-295
Author(s):  
Ru Fu Hu ◽  
Xiao Ping Chen ◽  
Huan Xin Yao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Rise ◽  
High Speed ◽  
Thermal Deformation ◽  
Thermal Characteristics ◽  
Machining Accuracy ◽  
Spindle System ◽  
Modeling And Analysis ◽  
Mechanical Coupling

Improving thermal characteristics is a crucial approach for increasing machining accuracy of NC lathe. Modeling and analysis of thermal characteristics to a high speed NC lathe were implemented by using finite element method in this paper. Based on this, temperature rise characteristic of the whole spindle system was obtained. The thermal deformation of spindle system due to thermal-mechanical coupling was calculated. Layout and parameter were optimized for the radiating plate of spindle box. And this leads to a considerable reduction in the run-out error of spindle head. The optimization result reaches the expected goal.

Study on the Restraint Method of Thermal Deformation in the Machine Tools

2013 ◽  
Vol 797 ◽  
pp. 603-608
Author(s):  
Kyosuke Umezu ◽  
Kazuhito Ohashi ◽  
Shinya Tsukamoto
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Thermal Deformation ◽  
Estimation Accuracy ◽  
Machining Accuracy ◽  
Long Time ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Automatic Mass ◽  
Main Factor

In the NC machine tools for automatic mass production processing lines, it is demanded that high stable machining accuracy is maintained for a long time. The main factor of deterioration in machining accuracy depends on the thermal deformation of machine tool, and the measures are one of the most important issues in the machine tool design. The thermal deformation is practically estimated by the temperature changing state of machine tools based on obtained data of their thermal deformation chracteristics. The estimation accuracy of thermal deformation depends on the thermometry points of machine tool greatly. This study describes an approach to the most suitable thermometry points in machine tool to determine the effective thermal deformation measures experimentally. As a result, the existence of points where the temperature of components changed with relation to thermal deformation very closely was confirmed.

Study on Thermal Error Measurement Model of Small Precision Machine Tools

2015 ◽  
Vol 741 ◽  
pp. 789-792
Author(s):  
Yang Xu ◽  
Jian Mao ◽  
De Jia Chen
Keyword(s):  
Machine Tools ◽  
Thermal Error ◽  
Measurement Model ◽  
Machining Accuracy ◽  
Precision Machine ◽  
Algorithm Theory ◽  
Precision Machine Tools ◽  
The Impact ◽  
Main Factor ◽  
Model Approach

Taking the effect of geometric errors on machining accuracy into consideration in the design of small precision machine tools, the thermal errors become the main factor affecting the machining accuracy of machine tools. Currently, how to quickly and effectively evaluate the impact of thermal error on machining precision, in order to make effective thermal error prediction and compensation method, is needed to solve for small precision machining. Based on stepwise regression algorithm theory, combined with the DBB measured and analyzed on MATLAB in this paper, a better thermal error fitting regression formula is obtained. Meanwhile, this mathematical model approach is also applicable in a variety of other areas, such as machine tool thermal error analysis, compensation and testing etc.

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