Research on Spindle Bearing Pre-Tightening Based on Spacer Sleeve Adjustment

2014 ◽  
Vol 488-489 ◽  
pp. 1087-1090 ◽  
Author(s):  
Yu Ming Qi ◽  
Xian Zhu Zhu ◽  
San Peng Deng ◽  
Zhong Min Wang
Keyword(s):  
High Precision ◽  
Calculation Method ◽  
Tightening Force ◽  
Machining Precision ◽  
Spindle Bearing ◽  
Precision Machine ◽  
Universal Spindle ◽  
Machine Spindle ◽  
Main Factors

Machine spindle pre-tightening force is closely related to machining precision. Universal spindle is generally pre-tightened through spacer sleeve adjustment. The calculation method about bearing pre-tightening force is put forward through analyzing and computing the main factors of bearing pre-tightening force, and the machine spindle bearing pre-tightening methods based on pre-tightening force are described in detail. This method is used for installation and maintenance of machine spindle, and it is proved to achieve the accuracy recovery of high-revolution, high-precision machine spindle.

scholarly journals High-precision Joint 2D Traveltime Calculation for Seismic Processing

2018 ◽  
Vol 22 (4) ◽  
pp. 327-334 ◽  
Author(s):  
Hui Sun ◽  
Fanchang Meng ◽  
Zhihou Zhang ◽  
Cheng Gao ◽  
Mingchen Liu
Keyword(s):  
High Precision ◽  
Calculation Method ◽  
Numerical Models ◽  
New Method ◽  
Fast Marching Method ◽  
Surrounding Area ◽  
Fast Marching ◽  
Seismic Processing ◽  
Grid Nodes ◽  
Marching Method

Fast Marching Method (FMM) boasts high calculation efficiency and strong adaptability and stability while being applied to seismic traveltime. However, when it is applied to the largescale model, the calculation precision of FMM is insufficient. FMM has poor calculation precision near the source, which is an essential reason for the low accuracy of the whole algorithm. This paper puts forward a joint traveltime calculation method to address the problem. Wavefront Construction (WFC) with a relatively high calculation accuracy rather than FMM is adopted for calculation of the grid nodes’ traveltime near the source. After that, FMM is used to calculate the seismic traveltime in the remaining area. Joint traveltime calculation method greatly improves the calculation accuracy of the source’s surrounding area and the calculation accuracy of FMM. According to the new method, FMM is still adopted for the calculation of most grid nodes in the model, so the high calculation efficiency of FMM is maintained. Multiple numerical models are utilized to verify the above conclusions in the paper. 

High-precision machine for decorating glassware

1974 ◽  
Vol 31 (10) ◽  
pp. 736-736
Author(s):  
N. A. Yudin ◽  
A. Z. Sanatulin ◽  
A. D. Shuvanov ◽  
I. A. Figurovskii ◽  
V. A. Zubanov
Keyword(s):  
High Precision ◽  
Precision Machine

Allowable Height Difference between Adjacent Monoliths with Spherical Surface Key Groove in Transverse Joints

2013 ◽  
Vol 438-439 ◽  
pp. 624-628
Author(s):  
Dan Ni Luo ◽  
Yu Hu ◽  
Qin Bing Li
Keyword(s):  
Analytical Model ◽  
Calculation Method ◽  
Spherical Surface ◽  
Arch Dam ◽  
Volume Deformation ◽  
Height Difference ◽  
Computation Theory ◽  
Main Factors ◽  
Vertical Deformations

The calculation method of the minimum aperture of transverse joints with spherical surface key groove was introduced in this study. Based on the computation theory of allowable height difference between adjacent monoliths proposed by Bofang Zhu, the analytical model of allowable height difference of Xiluodu arch dam was established with consideration of the effect of main factors on the transverse joints deformation, including the temperature, autogenous volume deformation, self-weight and foundation. After the horizontal and vertical deformations of transverse joints was required, according to the form of spherical surface key groove, the aperture of each part of key groove and the minimum aperture were obtained at several height difference between adjacent monoliths. The allowable height difference was determined on the condition of meeting the grouting requirements of transverse joints. The result shows that the allowable height difference for Xiluodu arch dam should not be more than 30m.

The Analysis about Increasing Competitive Ability to Accepting Orders of Garment Enterprise

2012 ◽  
Vol 433-440 ◽  
pp. 1879-1883
Author(s):  
Yu Ying Qiu
Keyword(s):  
Calculation Method ◽  
Competitive Ability ◽  
Working Ability ◽  
Main Factors

Main factors of affecting the ability to accept orders of garment enterprises ate working ability and competitive capacity. This paper mainly discusses three ability parameters of assemble line, and makes assessment for the working ability of the order. Simultaneously, it investigates the price composition of processing expense, and puts forward sample and practicable calculation method, which evaluates the competitive ability of enterprise. The conclusions and ways posed in this paper have practical value for trading.

Sign in / Sign up

Export Citation Format

Share Document