Influence of thickness reduction on the forming results in the three-dimensional surface rolling process with rigid arc-shaped rollers

2021 ◽  
Author(s):  
Xintong Wang ◽  
Mingzhe Li ◽  
Xiang Chang
Keyword(s):  
Three Dimensional ◽  
Rolling Process ◽  
Thickness Reduction ◽  
Dimensional Surface

EVALUATION FOR RESIDUAL AXIAL FORCE OF CORRODED HIGH TENSILE BOLTS

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Ryoichi Satake ◽  
Katashi Fujii ◽  
Yumi Mori
Keyword(s):  
Axial Force ◽  
Three Dimensional ◽  
High Strength ◽  
Surface Shape ◽  
Thickness Reduction ◽  
Long Time ◽  
Force Reduction ◽  
The Relationship ◽  
Dimensional Surface

This paper presents a method for evaluating the residual axial force of corroded high strength bolts in experiments, and analysis measuring the axial force of corroded high strength bolts. In order to reproduce the axial force reduction due to corrosion, the test specimens were made by cutting the bolt head widthwise or the height-wise with an initial axial force. The curve of axial force lowering is prepared with a reduced thickness in height and width of bolts as a parameter. Therefore, the residual axial force can be estimated by the thickness reduction of bolt. Moreover, we measured the residual axle force of real corroded high strength bolts, taken from a bridge removed from service for a long time, and inspected an axis drop curve. In order to classify corrosion shapes, we measured the three-dimensional surface shape of corroded high strength bolts without contact, and considered the relationship between the surface shape of corroded high strength bolts and the axial force reduction.

Rolling Process for the Continuous Forming of Curved Surface Parts Based on Bended Rolls

2013 ◽  
Vol 684 ◽  
pp. 334-337
Author(s):  
Zhong Yi Cai ◽  
Mi Wang ◽  
Ming Zhe Li
Keyword(s):  
Convex Surface ◽  
Three Dimensional ◽  
Rolling Process ◽  
Forming Process ◽  
Continuous Forming ◽  
Metal Forming Process ◽  
Longitudinal Bending ◽  
Roll Gap ◽  
Curved Surface Parts ◽  
Dimensional Surface

A new sheet metal forming process which can form three-dimensional surface rapidly, effectively and with lower-cost has been proposed. This paper mainly focuses on the fundamental aspects of the process. The principle of the rolling process based on bended rolls is introduced, and the methods to calculate the longitudinal bending deformation and to design the roll gap are presented. Experiments for typical surface parts are carried out. The forming results of convex surface and saddle shaped surface parts are measured and analyzed, the analyzed results demonstrated that the proposed process is a feasible and effective way of forming three-dimensional surface parts.

Research on flexible asymmetric rolling process for three-dimensional surface parts

2017 ◽  
Vol 95 (5-8) ◽  
pp. 2339-2347 ◽  
Author(s):  
Daming Wang ◽  
Changan Yu ◽  
Mingzhe Li ◽  
Xianzhong He ◽  
Zhijun Xie ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Process ◽  
Asymmetric Rolling ◽  
Dimensional Surface

Enhancement of Heat Transfer Performance in Nuclear Fuel Rod Using Nanofluids and Surface Roughness Technique

2015 ◽  
Author(s):  
Kang Liu ◽  
Titan C. Paul ◽  
Leo A. Carrilho ◽  
Jamil A. Khan
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Nuclear Fuel ◽  
Three Dimensional ◽  
Pressurized Water ◽  
Bulk Fluid ◽  
Fuel Rod ◽  
Dimensional Surface

The experimental investigations were carried out of a pressurized water nuclear reactor (PWR) with enhanced surface using different concentration (0.5 and 2.0 vol%) of ZnO/DI-water based nanofluids as a coolant. The experimental setup consisted of a flow loop with a nuclear fuel rod section that was heated by electrical current. The fuel rod surfaces were termed as two-dimensional surface roughness (square transverse ribbed surface) and three-dimensional surface roughness (diamond shaped blocks). The variation in temperature of nuclear fuel rod was measured along the length of a specified section. Heat transfer coefficient was calculated by measuring heat flux and temperature differences between surface and bulk fluid. The experimental results of nanofluids were compared with the coolant as a DI-water data. The maximum heat transfer coefficient enhancement was achieved 33% at Re = 1.15 × 105 for fuel rod with three-dimensional surface roughness using 2.0 vol% nanofluids compared to DI-water.

Sign in / Sign up

Export Citation Format

Share Document