Steel Ball Temperature Uniform Distribution Time Calculation Method in Annealing Process

2012 ◽  
Vol 472-475 ◽  
pp. 1639-1644
Author(s):  
Xiao Zeng Wang ◽  
Jiu Hong Yang
Keyword(s):  
Temperature Distribution ◽  
Uniform Distribution ◽  
Heat Conduction Equation ◽  
Series Solution ◽  
Quadratic Function ◽  
Annealing Process ◽  
Steel Ball ◽  
Spherical Bessel Function ◽  
Time Calculation ◽  
Ball Surface

The paper presents a fitness formula which is adopted to calculate the steel ball temperature uniform distribution time in the annealing process, analyses the steel ball temperature distribution in the process of heating. After the heat conduction equation of the steel ball is deduced, the spherical bessel function is adopted to solve it. The temperature distribution series solution is obtained. Using this formula, the steel ball temperature uniform distribution time of the different radius is calculated in the process of annealing. The result shows that the steel ball temperature uniform distribution time is the quadratic function of the steel ball radius. The time and radius data is adopted to deduce a second-order fitness polynomial. The steel ball temperature distribution is obtained in the different position. The steel ball temperature uniform distribution time is calculated by the fitness formula and the temperature distribution series one. The error between them is only 0.03%. The fitness formula can be used to calculate the steel ball temperature uniform distribution time. The change of the steel ball surface temperature is more severe than the internal. It often results in the crack of the steel ball in the annealing process.

Design of Deployment Mechanim of Steel Ball and Surface Defects Recognition

2013 ◽  
Vol 274 ◽  
pp. 245-248 ◽  
Author(s):  
Yan Ling Zhao ◽  
Wan Bo Che ◽  
Kai Zhou ◽  
Jia Ping Xuan
Keyword(s):  
Mathematical Model ◽  
Image Processing ◽  
Motion Analysis ◽  
Surface Defects ◽  
Steel Ball ◽  
Simulation Based ◽  
Ball Surface ◽  
Low Efficiency ◽  
The Mathematical Model ◽  
Ball Motion

At present, the steel ball surface defects are usually detected by manual work, but it has low efficiency and low reliability. For the current situation, in this paper, we design the steel ball deployment mechanism based on image processing technology, establish the mathematical model of the shooting point trajectory and determine the amount and location of the shooting points by the steel ball motion analysis. By the simulation based on Mathematica and Java, verify the effectiveness of the steel ball deployment mechanism in steel ball unfolding and defects recognition. Thus, the steel ball surface can be completely detected.

scholarly journals A Study on the Heat Transfer of Surrounding Rock-Supporting Structures in High-Geothermal Tunnels

2020 ◽  
Vol 10 (7) ◽  
pp. 2307
Author(s):  
Mingnian Wang ◽  
Yunpeng Hu ◽  
Dagang Liu ◽  
Cheng Jiang ◽  
Qiling Wang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Quadratic Function ◽  
Surrounding Rock ◽  
Curing Temperature ◽  
Rock Temperature ◽  
Lining Structure ◽  
Tunnel Design ◽  
The Impact ◽  
Research And Design ◽  
Initial Rock

The temperature distribution is one of the most vital parameters which should be fully considered in high geothermal tunnel design. For the purpose of studying the impact of temperature disturbance caused by construction on temperature distribution of surrounding rock and lining structure in a high geothermal tunnel, a new finite difference model for temperature prediction was proposed. Based on the abundant field test results, forecast analysis for the research of a high geothermal tunnel in this paper is made. The results indicate that the temperature of the surrounding rock near the tunnel sidewall decreases obviously in the first 14 days while that of the surrounding rock far away is stable after tunnel excavation, and the rock temperature showed three ways of change: undulate type (<2 m), decline type (2–5 m) and stable type (>5 m). There is a linear relationship between the initial rock temperature and the released heat of the surrounding rock. The radius of the heat-adjusting layer and the initial rock temperature presents a quadratic function relation. The lining concrete actually cures under the variable high-temperature environment and the real curing temperature decreases with time and becomes stable seven days later. The results would contribute to providing support for high geothermal tunnel research and design.

Relationship Between Temperature Distribution in EHL Film and Dimple Formation

2005 ◽  
Vol 127 (3) ◽  
pp. 658-665 ◽  
Author(s):  
Kazuyuki Yagi ◽  
Keiji Kyogoku ◽  
Tsunamitsu Nakahara
Keyword(s):  
Phase Transition ◽  
Experimental Study ◽  
Temperature Distribution ◽  
Elastohydrodynamic Lubrication ◽  
Infrared Emission ◽  
Maximum Temperature ◽  
Oil Film ◽  
Sliding Direction ◽  
Oil Flow ◽  
Ball Surface

This paper describes an experimental study on dimple formation under elastohydrodynamic lubrication (EHL) conditions. The oil film thickness between a ball surface and a glass disk was measured using optical interferometry, and the temperatures of both the surfaces and of the oil film averaged across it were measured using an infrared emission technique. It was found that the temperature profile across the oil film varies abruptly along the sliding direction, and the Couette flow decreases due to the viscosity wedge action as the oil flow is close to the dimple zone. The maximum temperature rise in the dimple zone sometimes reached over 400 K, thus, the phase transition of the oil from liquid to glass may not occur.

New Method of Spherical Surface Defect Detection Based on Machine Vision

2011 ◽  
Vol 295-297 ◽  
pp. 1274-1278 ◽  
Author(s):  
Jian Xi Yang ◽  
Fa Yu Zhang ◽  
Xiao Xia Song ◽  
Hong Zhe Xu
Keyword(s):  
Surface Defect ◽  
Spherical Surface ◽  
Steel Ball ◽  
Defect Inspection ◽  
Surface Reflection ◽  
Video Cameras ◽  
Quality Classification ◽  
Red Led ◽  
Ball Surface ◽  
Surface Defect Detection

According to requirements of online steel ball surface defect inspection, the automatic detection method of spherical surface defect on the track has been posed. To ensure photographing of the whole steel ball surface, the six CCD video cameras are used in this system. To overcome steel ball surface reflection, the red LED light source is used, and then the real and clear images are got. The steel ball surface defect is recognized accurately by means of image recognition technology and image reconstruction technology etc. This method provides theoretical basis and technical support for ball defection and quality classification.

Improved Point-Matching Techniques Applied to Multi-Region Heat Transfer Problems

1972 ◽  
Vol 94 (2) ◽  
pp. 203-209 ◽  
Author(s):  
D. M. France ◽  
T. Ginsberg
Keyword(s):  
Temperature Distribution ◽  
Boundary Conditions ◽  
Series Solution ◽  
The Other ◽  
Flow Area ◽  
Irregular Boundary ◽  
Nusselt Numbers ◽  
The Difference ◽  
Irregular Boundary Conditions ◽  
Matching Techniques

An analytical method is presented which extends the series solution of the Laplace and Poisson equations with irregular boundary conditions to multi-cell problems. The method employs a least-squares technique of satisfying the boundary conditions on the irregular boundaries and eliminates the use of a finite number of boundary points to satisfy these conditions. The technique is applied to the calculation of the fully developed temperature distribution of a constant-velocity fluid flowing parallel to a semi-infinite square array of circular nuclear fuel rods. The bounding wall of the array is located such that the flow area of the cell associated with the rod adjacent to the wall is different from the (equal) areas of all the other cells. The series solution is compared to a finite-difference solution for a sample case of two cells. The results for the semi-infinite array indicate that while the array temperature distribution is markedly affected by the difference in flow areas, the Nusselt numbers of the rods are relatively unaffected. Typical results are presented for a pitch-to-diameter of 1.2; the flow area of the first cell is 3.67 percent greater than the area of the other cells.

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