Flatness measurement of a very large diameter plate on a machine tool by error separation method

1994 ◽  
Vol 16 (3) ◽  
pp. 233
Keyword(s):  
Machine Tool ◽  
Large Diameter ◽  
Separation Method ◽  
Error Separation ◽  
Flatness Measurement

Influence of Diameter and Number of Orifice on Static Characteristics of Radial-Thrust Aerostatic Bearing

2012 ◽  
Vol 497 ◽  
pp. 78-82
Author(s):  
Fei Hu Zhang ◽  
Sheng Fei Wang ◽  
Qiang Zhang ◽  
Peng Qiang Fu
Keyword(s):  
Machine Tool ◽  
Fluid Dynamic ◽  
Load Capacity ◽  
Large Diameter ◽  
Orifice Diameter ◽  
Static Characteristics ◽  
Aerostatic Bearing ◽  
Supporting System ◽  
Manufacturing Technologies ◽  
Radial Thrust

The working performance of the spindle system is the most important factor to embody the overall performance of the machine tool. To ensure the advanced capabilities, besides the high-precision manufacturing technologies, it is mainly depending on the bearing module and the forces on the spindle. In this paper, a new strategy of the vertical spindle supporting system is presented to meet the high stiffness requirement for the aerostatic bearing. Based on the computational fluid dynamics and finite volume method, a fluid dynamic model and structure model of the large diameter incorporate radial-thrust aerostatic bearing is developed and simulated to find out the pressure distribution laws of the spindle supporting system. The grid subdivision in the direction of film thickness is paid more attentions when establishing the grid of the whole gas film. Simulation results show that this special structure of bearing module can supply enough load capacity and stiffness for the machine tool. The results also indicate that the static characteristics of the bearing are improved as the supply pressure increases and as the supply orifice diameter decreases.

Easy measuring instrument for analyzing the radial and tilt error motions of a rotating shaft

2017 ◽  
Vol 231 (2) ◽  
pp. 667-674 ◽  
Author(s):  
Dong-Hyeok Lee ◽  
Wi-Ro Lee
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Probe Method ◽  
Separation Method ◽  
Rotating Shaft ◽  
Error Separation ◽  
Real Time Measurement ◽  
Rotary Stage ◽  
Tilt Error ◽  
Error Motion

In this study, a real-time measurement system to easily apply multi-probe error separation method for error motion measurement of a shaft was designed and developed. An arrangement condition of sensing probes for accurate multi-probe error separation method was examined and verified by a simulation test. By following the examined arrangement condition for multi-probe method, a measurement system to measure radial and tilt error motions of a shaft was designed and developed. The efficiency of the multi-probe method with the examined arrangement condition was checked by comparing the error motion results for a rotary stage with the error motions in the specifications of the guarantee. It is expected to apply this system to a real-time monitoring system of failure diagnosis for rotating shafts in ships and plants.

Modal Analysis of the Bed Structure of Large Diameter Fresnel Lens Mold Machine Tool

2014 ◽  
Vol 912-914 ◽  
pp. 707-710
Author(s):  
Jia Liang Guan ◽  
Xiao Hui Zhang ◽  
Cheng Guo Cao ◽  
Xin Qiang Ma ◽  
Ling Chen
Keyword(s):  
Machine Tool ◽  
Modal Analysis ◽  
Theoretical Basis ◽  
Natural Frequencies ◽  
Large Diameter ◽  
Fresnel Lens ◽  
Structure Characteristics ◽  
Solid Works ◽  
3D Software ◽  
Ansys Workbench

Modeling of the large diameter Fresnel lens mold machine tool bed using 3D software solid works, and then import the ANSYS Workbench, natural frequencies and modal shapes are obtained by the study of the modal analysis and analysis of the structure characteristics of the machine bed, for the next step on the bed structure optimized to provide a reliable theoretical basis. Keywords: the bed; ANSYS Workbench; modal analysis; natural frequencies

An error separation method based on surface matching in large aspheric measurement

2019 ◽  
Vol 15 (4) ◽  
pp. 355
Author(s):  
Lin Sun ◽  
Shuming Yang ◽  
Pengfei Wu ◽  
Changsheng Li ◽  
Qijing Lin ◽  
...  
Keyword(s):  
Separation Method ◽  
Surface Matching ◽  
Error Separation

Deformation Analysis for Hydrostatic Rotary Table of Heavy Duty CNC Machine Tool

2013 ◽  
Vol 457-458 ◽  
pp. 335-339 ◽  
Author(s):  
Xiang Min Dong ◽  
Li Gang Cai ◽  
Yong Sheng Zhao ◽  
Xiao Shi
Keyword(s):  
Machine Tool ◽  
Large Diameter ◽  
Great Influence ◽  
Theory Of Elasticity ◽  
Deformation Analysis ◽  
Cnc Machine Tool ◽  
Rotary Table ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Closed Type

The deformation of constant flow and closed type hydrostatic rotary table of heavy duty CNC machine tool has a great influence on the film thickness because of its large diameter, high load-bearing. According to the circular plate deformation theory of elasticity, differential equations of worktable deformation are derived in the simply supported conditions when bearing uniform force of different locations. Displacement curves of worktable are obtained. Force and deformation weaknesses of hydrostatic rotary table are found, which can provide theory basis for supporting location of heavy workpiece machining and whether oil film is failure or not.

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