Measurement and Evaluation of Temperature Change of Water Driven Spindle

2016 ◽  
Author(s):  
Akio Hayashi ◽  
Yohichi Nakao
Keyword(s):  
Thermal Stability ◽  
Machine Tool ◽  
Temperature Change ◽  
Thermal Deformation ◽  
Single Point ◽  
Machining Process ◽  
Machining Accuracy ◽  
Precision Machine ◽  
Ultra Precision ◽  
Thermal Stability Of

Recently, various precision products such as lenses or mirrors are produced by the ultra-precision machine tools. Then, the single-point diamond cutting is mainly carried out using the ultra-precision machine tool. In order to generate the high accuracy and high quality machined surfaces, the high stiffness and precise rotational accuracy of the spindle is required for the ultra-precision machining tools. The water driven spindle had been developed for the precision machine tool spindle. This spindle is driven by the generated torque due to the water flow power. Then, the rotational speed can be controlled by the supplied flow rate of water. In addition, the spindle has the water hydrostatic bearings that achieve the high bearing stiffness and precise motion accuracy. Furthermore, it is expected that the water driven spindle has the high thermal stability since the water with low viscosity is used as a coolant media. If the thermal deformation of the spindle is caused during the machining process, the deformation degrades the machining accuracy, accordingly. Thus, it is desirable that the thermal deformation and the temperature change of each part of the spindle and machine tool structure can be controlled and minimized during machining process. In this paper, in order to investigate the thermal stability of the water driven spindle, the measurement tests of the temperature of the water driven spindle were carried out. In addition, the power loss due to the water viscosity between the rotor and the casing of the spindle is calculated. As a result, this paper considers the temperature change and considers the thermal stability of the water driven spindle from the results of experiments.

Finite Element Analysis and Optimization of Thermal Deformation of Resin Concrete Manufacturing Bases

2014 ◽  
Vol 543-547 ◽  
pp. 4010-4013
Author(s):  
Yao Chen ◽  
Xiu Xia Liang ◽  
Shuang Qiu
Keyword(s):  
Thermal Stability ◽  
Machine Tool ◽  
Thermal Deformation ◽  
Precision Machining ◽  
Element Analysis ◽  
Excellent Thermal Stability ◽  
Good Thermal Stability ◽  
Machining Center ◽  
Ultra Precision ◽  
Thermal Stability Of

Resin concrete generally has good mechanical properties, excellent thermal stability and great vibration resistance, the model of the ultra-precision machining center bed is established to study the thermal stability of the resin concrete using virtual reality and collaborative simulation technology based on Pro/E and ANSYS Workbench. The main factors that affect the machine tool bed thermal deformation were found through analyzing the deformation results and the materials and restrain conditions were optimized. The results proved that the optimized machine tool bed has good thermal stability and theoretical basis was provided to improve the thermal stability of the ultra-precision machining centers.

Research on Low Speed Servo Control Technology of Ultra-Precision Machine Tool

2007 ◽  
Vol 339 ◽  
pp. 163-167
Author(s):  
X.W. Sun ◽  
Fei Hu Zhang ◽  
Shen Dong ◽  
L.J. Zhang
Keyword(s):  
Machine Tool ◽  
Control Algorithm ◽  
Closed Loop ◽  
Single Point ◽  
Tracking Error ◽  
Machining Process ◽  
Kdp Crystal ◽  
Low Speed ◽  
Precision Machine ◽  
Ultra Precision

An ultra-precision machine is developed by Precision Engineering Research Institute of Harbin Institute of Technology to machine components made of KDP crystal with single point diamond fly cutting technique . A stable ultra-low speed feed of worktable is necessary in the machining process inasmuch as the KDP crystal components to be machined must be high form accuracy, low surface roughness and low surface waveness . This paper analyses the effect on speed stability and positioning accuracy under the control of semi-closed loop and full-closed loop based on the experimental data, and also present a compensating control algorithm of error disturbance feed-forward which enhances the stability of ultra-low speed motion of the semi-closed loop feed control servo system of the machine. The simulation results indicate that the values of the steadystate tracking error decreased to 1/10 after using compensating control algorithm. The P-V value of the aluminum specimen machined by the ultra-precision machine tool was 0.27 wavelengths.

Measurement and analysis for frequency domain error of ultra-precision spindle in a flycutting machine tool

2016 ◽  
Vol 232 (9) ◽  
pp. 1501-1507 ◽  
Author(s):  
Guoda Chen ◽  
Yazhou Sun ◽  
Chenhui An ◽  
Feihu Zhang ◽  
Zhiji Sun ◽  
...  
Keyword(s):  
Machine Tool ◽  
Frequency Domain ◽  
Frequency Domain Analysis ◽  
Frequency Characteristics ◽  
Machining Process ◽  
Machining Accuracy ◽  
Machined Surface ◽  
Ultra Precision ◽  
Machining Process Planning ◽  
Aerostatic Spindle

The ultra-precision spindle is the key component of ultra-precision machine tool, which largely influences the machining accuracy. Its frequency characteristics mainly affect the frequency domain error of the machined surface. In this article, the error measurement setup for the ultra-precision aerostatic spindle in a flycutting machine tool is established. The dynamic and multi-direction errors of the spindle are real-time measured under different rotation speeds. Then, frequency domain analysis is carried out to obtain its regularity characteristics based on the measurement result. Through the analysis, the main synchronous and asynchronous errors with relatively large amplitude of the spindle errors are found, and the amplitude change law of these main spindle errors is obtained. Besides, the cause of the main synchronous and asynchronous errors is also analyzed and indicated. This study deepens the understanding of ultra-precision spindle dynamic characteristics and plays the important role in the spindle frequency domain errors’ control, machining process planning, frequency characteristics analysis and oriented control of the machined surface errors.

Design Concept and Structural Configuration of Advanced Nano-Pattern Generator with Large Work Area “ANGEL”

2011 ◽  
Vol 5 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Hayato Yoshioka ◽  
◽  
Hidenori Shinno
Keyword(s):  
Machine Tool ◽  
Three Dimensional ◽  
Design Concept ◽  
Machining Accuracy ◽  
Structural Configuration ◽  
Structured Surfaces ◽  
Precision Machine ◽  
Work Area ◽  
Wide Range ◽  
Ultra Precision

Industrial demands for ultra-precision machining have rapidly increased in a wide range of industries, e.g., aerospace, semiconductors, optics, molds, etc. In particular, various structured surfaces with micro- and nano-sized patterns have recently been required for advanced science and engineering fields. In order to rationally meet such requirements, it is indispensable to develop an ultra-precision machine tool with both nanometer-level machining accuracy and a large machining area. In this paper, therefore, the design concept and structural configuration of a desirable ultra-precision machine tool are proposed based on a new design concept. The machine tool developed here has a perfect non-contact structure and achieves three-dimensional nano-machining over a wide area with nanometer spatial resolution.

Application of Multifunctional Materials for Machine Tool Structures

2009 ◽  
Author(s):  
Francesco Aggogeri ◽  
Angelo Merlo ◽  
Marco Mazzola ◽  
Nicola Pellegrini
Keyword(s):  
Thermal Stability ◽  
Machine Tool ◽  
Metal Foam ◽  
Operating Time ◽  
Weight Ratio ◽  
Material Behavior ◽  
Time Range ◽  
Machining Accuracy ◽  
Machine Component ◽  
Latent Heat Storage

The competition on the international markets pushes manufacturers towards shorter design cycles and decreasing manufacturing times and costs for their products. This trend generates a demand for smart, flexible and faster machining systems, easy to set up and configure, which are able to drastically reduce machining time and improve the final accuracy. This paper rises from these considerations evaluating the possible application of multifunction materials in machine tool (MT) design and building. These solutions can provide a fundamental impact on functionality and reliability of a manufacturing system. In particular, use of innovative materials in today’s technology continues to grow steadily. Numerous reasons for this growth include light weight, superior insulating abilities, energy absorbing performance, excellent strength/weight ratio and low cost. This paper aims to investigate a possible application of multifunction materials in realisation of structure components for Machine Tools. There are many aspects that affect the machining accuracy and the cutting conditions of a high performance MT. The most important issues are related to the static, dynamic, mechatronic and thermal behavior of the machines. In particular, a strict requirement that a machine tool has to fulfill in order to drastically reduce operating time while improving the final accuracy is the thermal stability. This paper shows a complete study and testing validation on prototypes (plates and beam) based on sandwiches with core made of metal foam (open and closed cells) materials impregnated by a PCM (Phase Material Change) wax. Metal foams represent a class of materials with low density and novel physical, mechanical, thermal, electrical and acoustic proprieties. They offer potential for lightweight structures, for energy absorption and thermal management. PCMs are latent heat storage materials that absorb heat keeping constant the temperature of a machine component in a defined time range. The authors have designed, realized and tested the prototypes developing thermal trials, and then evaluating the comparison between experimental data and simulative analysis (FEM). The trials consisted to process the prototypes at a variation of temperature in order to assess the PCM proprieties to absorb heat and maintain thermal stability in a defined time range. The paper shows also a simulative study on PCM material behavior and their application in MT design supported by experimental trials and data analysis. The significant advantages and perspectives that can be obtained in applying of these MT structures complete the developed study.

scholarly journals Dynamic Accuracy Design Method of Ultra-precision Machine Tool

2018 ◽  
Vol 31 (1) ◽  
Author(s):  
Guo-Da Chen ◽  
Ya-Zhou Sun ◽  
Fei-Hu Zhang ◽  
Li-Hua Lu ◽  
Wan-Qun Chen ◽  
...  
Keyword(s):  
Machine Tool ◽  
Design Method ◽  
Dynamic Accuracy ◽  
Precision Machine ◽  
Ultra Precision
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