Analysis of Leveling Strategy for a Plate Mill

2010 ◽  
Vol 145 ◽  
pp. 424-428 ◽  
Author(s):  
Li Cui ◽  
Xian Lei Hu ◽  
Xiang Hua Liu
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Time Delay ◽  
Static Pressure ◽  
High Strength ◽  
Plate Mill ◽  
Elastic Plastic ◽  
Residual Curvature ◽  
Deformation Ratio

In order to analysis the effect of leveling strategy on the quality of plate products, the curvature integration by elastic-plastic differences was adopted to simulate leveling results by different leveling strategy. It had studied plastic deformation ratio, residual stress, residual curvature and leveling force for different leveling strategies to find the effectual strategy and the adaptability conditions were given. Additionally, static pressure leveling with the time delay strategy was analyzed, which was proved to be an effectual strategy to resolve the leveling problem for high strength thicker plate by a certain 3500mm mill plate.

Improving the Quality of Parts Produced by Bending in a Die with an Elastic Element

2019 ◽  
Vol 822 ◽  
pp. 144-149
Author(s):  
Elena Nesterenko ◽  
Anton Volgushev ◽  
Katharina Frese
Keyword(s):  
Plastic Deformation ◽  
Elastic Element ◽  
Spring Back ◽  
Elastic Plastic ◽  
A Value ◽  
The Press ◽  
Elastic Spring

The process of less than 90 degrees angle bending is presented in this article. Elastic-plastic deformation took place in the sample. After removing the force, the effect of elastic spring-back occurs – the angle of the part is increased by a value that depends on many parameters. The usage of an elastic element in the stamp allows us to change the angle of spring-back. This is happened doe to adjusting the height of the press stroke. This allows us to produce parts with accurate dimensions.

Key Technology to Reduce Residual Stress Level of High Strength Steel

2012 ◽  
Vol 572 ◽  
pp. 221-226
Author(s):  
Wen Hong Ding
Keyword(s):  
Residual Stress ◽  
Stress Level ◽  
High Strength Steel ◽  
Rolling Force ◽  
Technical Problem ◽  
High Strength ◽  
Improve Performance ◽  
Key Technology ◽  
Servo Valve

Given that the traditional hot temper passing process cannot fulfill the demand of high strength steel on residual stress level and stable processability, leveler and temper passing process with dual servo valve (LTP-DSV) is developed to solve this technical problem. LTP-DSV process employs leveler to reduce residual stress level of high strength steel; uses dual servo valve variable gain rolling force control technology to improve performance stability of high strength steel; improves surface quality of high strength steel by means of temper passing. The residual stress level of products is substantially reduced on condition that the performance of high strength steel is ensured. The actual production data shows LTP-DS process is able to improve the performance and quality of high strength steel from all aspects.

Mechanical properties of Fe-based bulk glassy alloys in Fe–B–Si–Nb and Fe–Ga–P–C–B–Si systems

2003 ◽  
Vol 18 (6) ◽  
pp. 1487-1492 ◽  
Author(s):  
A. Inoue ◽  
B. L. Shen ◽  
A. R. Yavari ◽  
A. L. Greer
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Vickers Hardness ◽  
Glassy Alloy ◽  
High Strength ◽  
Deformation Mode ◽  
Soft Magnetic Materials ◽  
Elastic Plastic ◽  
Glassy Alloys ◽  
Hardness Tests

Mechanical properties of cast Fe-based bulk glassy alloy rods with compositions of (Fe0.75B0.15Si0.1)96Nb4 and Fe77Ga3P9.5C4B4Si2.5 were examined by compression and Vickers hardness tests. The Young's modulus (E), yield strength (σy), fracture strength (σf), elastic strain (εe), fracture strain (εf), and Vickers hardness (Hv) were 175 GPa, 3165 MPa, 3250 MPa, 1.8%, 2.2%, and 1060, respectively, for the former alloy and 182 GPa, 2980 MPa, 3160 MPa, 1.9%, 2.2%, and 870, respectively, for the latter alloy. The εf /E and Hv/3E were 0.019–0.017 and 0.020–0.016, respectively, for the alloys, in agreement with the previous data for a number of bulk glassy alloys. The agreement suggests that these Fe-based bulk glassy alloys have an elastic–plastic deformation mode. The syntheses of high-strength Fe-based bulk glassy alloys with distinct compressive plastic strain and elastic–plastic deformation mode are encouraging for future development of Fe-based bulk glassy alloys as structural and soft magnetic materials.

Theoretical Research of Residual Stress on H-Beam Roller Straightening

2012 ◽  
Vol 499 ◽  
pp. 258-262
Author(s):  
Xiao Wen Liu ◽  
Shi Qiang Zhang ◽  
Hui Gang Wang ◽  
Hai Sheng Liu
Keyword(s):  
Residual Stress ◽  
Carrying Capacity ◽  
Theoretical Research ◽  
Technological Parameters ◽  
Elastic Plastic ◽  
Elastic Core ◽  
Residual Curvature ◽  
Simulation Results ◽  
Core Height ◽  
H Beam

The residual stress of H-beam brought on roller straightening is very influential on carrying capacity of H-beam. It is not perfect to appraise the straightening effect only by residual curvature traditionally. In this paper, based on elastic-plastic theory, elastic core height of section and residual stress of H-beam on roller straightening are studied. Correlative formulae are deduced. Examples and simulation results show that the formulae are correct. The conclusions of this paper are important for the establishment of straightening technological parameters.

Numerical Analysis of Thermal Residual Stress in Diamond Film Deposited on Molybdenum Substrate

2010 ◽  
Vol 139-141 ◽  
pp. 456-459
Author(s):  
Chang Long Liu ◽  
Da Pei Tang
Keyword(s):  
Experimental Data ◽  
Residual Stress ◽  
Plastic Deformation ◽  
Diamond Film ◽  
Radial Stress ◽  
Axial Stress ◽  
Thermal Residual Stress ◽  
Molybdenum Substrate ◽  
Stress Components

In order to solve the problem of diamond film crack when deposited on molybdenum substrate to improve the preparation quality of diamond film and the rate of finished products , the distributions of thermal residual stress components in diamond film and at interface between the film and molybdenum substrate were simulated by finite element method in the case of whether to consider the plastic deformation of molybdenum substrate or not, moreover, the influence of thermal residual stress upon the failure of film was analyzed. Results show that thermal residual stress is more coincidental with experimental data when the plastic deformation of molybdenum substrate is considered. There are large tensile radial stress and tensile axial stress in the vicinity of upper surface of the film, which is the primary cause for the film to crack.

Roller Working Effect on Fatigue Strength of Ti-6Al-4V Alloy

2004 ◽  
Vol 261-263 ◽  
pp. 1269-1274
Author(s):  
S.Y. Son ◽  
S. Nishida ◽  
Nobusuke Hattori ◽  
W.T. Jeong
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Fatigue Strength ◽  
Fatigue Limit ◽  
Room Temperature ◽  
Hardness Test ◽  
Notch Effect ◽  
Sem Observation ◽  
Notched Specimens ◽  
Deformation Ratio

The fatigue strength have been investigated about the plastic deformed specimens by roller working in Ti-6Al-4V alloy with a notch by 4 kinds of plastic deformation ratio. The plastic deformation values (Δ t) are employed 0.05, 0.1, 0.25 and 0.4 mm on notched specimens of Ti-6Al-4V alloy by roller-working. The hardness test, fatigue test and SEM observation was carried out on non-roller worked specimens and roller-worked specimens at room temperature. Based on the results of these tests, Though the hardness number of roller worked materials are higher than those of non-deformed Ti-6Al-4V alloy, the fatigue limit of roller worked materials becomes deteriorated in spite of roller working. Fatigue fracture had occurred in the non- deformed area where tensile residual stress exists. From the results of the SEM observation, stepped defect could be notch effect for reducing the fatigue strength of Ti-6Al-4V alloy.

scholarly journals Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 831
Author(s):  
Yang Li ◽  
Zhengtong Lu ◽  
Tingchao Li ◽  
Dalei Li ◽  
Jinsheng Lu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Plastic Deformation ◽  
Stainless Steel ◽  
Severe Plastic Deformation ◽  
Mechanical Behavior ◽  
High Strength ◽  
304 Stainless Steel ◽  
Abrasive Waterjet ◽  
Positive Effects

In this study, two innovative surface severe plastic deformation (SSPD) methods, namely abrasive waterjet peening (AWJP) and ultrasonic nanocrystal surface modification (UNSM), were applied to a 304 stainless steel to improve the mechanical behavior. The surface roughness, microstructure, residual stress, hardness, and tensile mechanical properties of the alloy after the two SSPD treatments were studied systematically. The results show that both the AWJP and UNSM treatments have greatly positive effects on the mechanical-properties improvements by successfully introducing a hardening layer. Especially the UNSM-processed specimen possesses the most outstanding comprehensive mechanical properties (high strength with the comparable ductility). The yield strength with the UNSM treatment is 443 MPa, corresponding to the 109% and 19% improvements, as compared to that of the base (212 MPa) and AWJP-treated specimens (372 MPa). The results can be attributed to a much thicker hardening layer (about 500 μm) and a better surface integrity with lower roughness (Ra: 0.10 μm) formed by the UNSM technique.

FE Analysis on Rolls Deformation in Rolling Process of 4100 Heavy Plate Mill

2012 ◽  
Vol 562-564 ◽  
pp. 631-634
Author(s):  
Xue Tong Li ◽  
Min Ting Wang ◽  
Feng Shan Du ◽  
Yong Gang Cui
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Rolling Process ◽  
Fe Analysis ◽  
Fe Model ◽  
Plate Mill ◽  
Elastic Plastic ◽  
Heavy Plate ◽  
Roll Gap

Against 4100 heavy plate miller, a 3-D rolling model involving rolls’ elastic deformation and workpiece’s elastic-plastic deformation is established using large deformation elastic-plastic finite element method. The distributions of the rolls’ bending deformation and the roll gap shape by simulation under the different processes. The results can provide the practical referential value for equipment design and processing setup of heavy plate mill. The FE model may be used to analyze skinning process on off-line.

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