scholarly journals COMPARISON OF ROLL DEFORMATION IN 4HI ROLLING MILL AND 20 HI ROLLING MILL DUE TO THERMAL STRESSES, OVERLOADING, SPALLING AND DESIGN PARAMETERS

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Ravi Kumar Goyal ◽  
Anurag Joshi ◽  
Umesh Gurnani
Keyword(s):  
Rolling Mill ◽  
Thermal Stresses ◽  
Design Parameters ◽  
Roll Deformation

Effect of Adhesive Thickness and Bonding Length on Behavior of Composite Adhesive Joints Subject to Torsion

2007 ◽  
Vol 124-126 ◽  
pp. 1313-1316
Author(s):  
Je Hoon Oh
Keyword(s):  
Finite Element Analysis ◽  
Thermal Stresses ◽  
Failure Modes ◽  
Adhesive Joints ◽  
Design Parameters ◽  
Stress Distributions ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Adhesive Thickness ◽  
Bonding Length

Combined thermal and mechanical analyses were used to investigate the effect of joint design parameters such as the adhesive thickness and bonding length on stress distributions and torque capacities of tubular adhesive joints with composite adherends. The finite element analysis was employed to calculate the residual thermal stresses due to fabrication, and the mechanical stresses were analyzed using the nonlinear analysis of tubular adhesive joints. The analyses reveal that the stacking angle, adhesive thickness and bonding length have a significant influence on residual thermal stresses, and consequently failure modes and joint strengths.

scholarly journals Fused filament fabrication of commercial conductive filaments: experimental study on the process parameters aimed at the minimization, repeatability and thermal characterization of electrical resistance

2020 ◽  
Vol 111 (9-10) ◽  
pp. 2971-2986 ◽  
Author(s):  
Gianni Stano ◽  
Attilio Di Nisio ◽  
Anna Maria Lanzolla ◽  
Mattia Ragolia ◽  
Gianluca Percoco
Keyword(s):  
3D Printing ◽  
Electrical Resistance ◽  
Thermal Stresses ◽  
Wheatstone Bridge ◽  
Strain Sensors ◽  
Design Parameters ◽  
Strain Gauges ◽  
Fused Filament Fabrication ◽  
Embedded Sensing ◽  
3D Printed

Abstract Nowadays, a challenging scenario involving additive manufacturing (AM), or 3D printing, relates to concerns on the manufacturing of electronic devices. In particular, the possibility of using fused filament fabrication (FFF) technology, which is well known for being very widespread and inexpensive, to fabricate structures with embedded sensing elements, is really appealing. Several researchers in this field have highlighted the high electrical resistance values and variability in 3D-printed strain sensors made via FFF. It is important to find a way to minimize the electrical resistance and variability among strain sensors printed under the same conditions for several reasons, such as reducing the measurement noise and better balancing four 3D-printed strain gauges connected to form a Wheatstone bridge to obtain better measurements. In this study, a design of experiment (DoE) on 3D-printed strain gauges, studying the relevance of printing and design parameters, was performed. Three different commercial conductive materials were analyzed, including a total of 105 printed samples. The output of this study is a combination of parameters which allow both the electrical resistance and variability to be minimized; in particular, it was discovered that the “welding effect” due to the layer height and printing orientation is responsible for high values of resistance and variability. After the optimization of printing and design parameters, further experiments were performed to characterize the sensitivity of each specimen to mechanical and thermal stresses, highlighting an interesting aspect. A sensible variation of the electrical resistance at room temperature was observed, even if no stress was applied to the specimen, suggesting the potential of exploiting these materials for the 3D printing of highly sensitive temperature sensors.

Estimation of the resource of sliding bearings of roll reinforcement in section rolling mills

2021 ◽  
pp. 43-46
Author(s):  
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Design Parameters ◽  
Wear Model ◽  
Section Mill ◽  
Sliding Bearings ◽  
Rolling Mills ◽  
Bearing Unit ◽  
Rolling Roll ◽  
Section Rolling

A new bearing unit is developed for the input roll reinforcement of the stands of 170 ПАО MMK section mill. A model of wear of sliding bearings is considered, which establishes the influence of the design parameters of the bearing, the frictional characteristics of materials and the conditions of surface treatment on the resource, friction force and contour pressure. Keywords: section rolling mill, hot rolling, roll reinforcement, sliding bearings, wear model, resource. [email protected]

Failure Analysis of Si3N4 Rolls for Wire Hot Rolling by Numerical Simulation of Thermal and Mechanical Stresses

2005 ◽  
Vol 290 ◽  
pp. 94-101 ◽  
Author(s):  
Markus Lengauer ◽  
Robert Danzer ◽  
Domagoj Rubeša ◽  
Walter Harrer ◽  
W. Zleppnig
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Silicon Nitride ◽  
Hot Rolling ◽  
Rolling Mill ◽  
Subcritical Crack Growth ◽  
Thermal Stresses ◽  
High Strength ◽  
Induced Stresses ◽  
Observed Damage

Silicon nitride rolls for wire hot rolling have been tested in the rolling mill. After short employment for processing of ultra-high strength materials, cracks appeared in the roll calibre, which limited further application of the rolls. In order to find out possible causes for the damage, relevant mechanical properties of the roll have been determined and thermally and mechanically induced stresses were assessed by numerical simulation. It has been found that thermal stresses are of little relevance, whereas mechanically induced stresses are high enough to enhance subcritical crack growth resulting in the development of the macroscopic cracks, so that the observed damage of the rolls could have been adequately explained. One further result of the analysis was that flaws induced by grinding are decisive for the service time of ceramic rolls, so that special attention has to be paid to the machining of the roll calibre.

EFFECT OF ASYMMETRICAL STAND STIFFNESS ON HOT ROLLED STRIP SHAPE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5734-5739 ◽  
Author(s):  
DIANYAO GONG ◽  
JIANZHONG XU ◽  
ZHENGYI JIANG ◽  
XIAOMING ZHANG ◽  
XIANGHUA LIU ◽  
...  
Keyword(s):  
Rolling Mill ◽  
Deformation Analysis ◽  
Rolled Strip ◽  
Force Distribution ◽  
Influence Coefficient ◽  
Single Wave ◽  
Hot Rolled Strip ◽  
Strip Shape ◽  
Roll Deformation ◽  
Hot Rolled

The difference of elastic springs between the operating side (OS) and driving side (DS) of rolling mill has a significant influence on the strip shape not just the strip thickness. Based on the slit beam and roll deformation theories, the roll force distribution was analysed considering the asymmetric stiffness of the OS and DS of rolling mill, and the work roll and backup roll deformation equations were deduced respectively, and the thickness distribution in lateral direction of the hot rolled strip at exit was discussed. Using the roll elastic deformation analysis software which was developed previously based on the influence coefficient method, the roll flattening distribution, roll pressure distribution and the rolling force distribution caused by the asymmetric stand stiffness were calculated and analysed, and the exit strip profile of the rolling mill was also presented. The relationship between the mill stiffness difference and the strip wedge shape or single wave was obtained. Effect of the upstream asymmetric mill on strip crown and flatness of the downstream stands was discussed.

Review on Cold Rolling Mill Roll Deformation

2017 ◽  
Vol 1 (1) ◽  
pp. 83-95
Author(s):  
Dr. Ravi Goyal ◽  
◽  
Anurag Joshi ◽  
Umesh Gurnani ◽  
◽  
...  
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Mill Roll ◽  
Cold Rolling Mill ◽  
Rolling Mill Roll ◽  
Roll Deformation

scholarly journals Mathematical and software for the study of the dynamics of the finished rolling mill block wire mill

2018 ◽  
pp. 394-401
Author(s):  
V.I. Bolshakov ◽  
K.P. Lopatenko ◽  
A.M. Yunakov ◽  
A.A. Chernyshev
Keyword(s):  
Rolling Mill ◽  
High Speed ◽  
Block Design ◽  
Objective Assessment ◽  
Gear Ratio ◽  
Design Parameters ◽  
Technical Solution ◽  
Wire Mill ◽  
Linear Differential ◽  
Design Calculations

The aim of the work is the development of mathematical and software for the study of transients arising from the management of the finishing unit of the mill of the rolling mill 150. The movements, speeds, accelerations and torques in various connections of the finishing unit were studied. The linear mechanical analogue in the form of an extensive system of discrete masses connected by elastic-dissipative elements was used to estimate the integral characteristics of the block load. Block design calculations include engines, a distribution gearbox, two transmission shafts for rolling rolls of horizontal and vertical stands of the block. The mathematical model for analyzing the oscillation frequencies of a block is represented by a system of second-order linear differential equations. The equations for changing the drive current in the armature circuit of the motor and in the excitation circuit, equalizing the motion of the armature (rotor) of the electric motor, the equations for determining the motor torque are presented. . According to the results of studies of the mill 150, the range of rolling speeds outside the resonant zones was established and the possibility of increasing the rolling speed by 10% was justified. Analysis of the frequencies, the level and nature of dynamic loads allowed us to develop a technical solution to reduce the dynamics of the drive line by changing the gear ratio of the gearbox. The study of the dynamics of the rolling unit of the first in Ukraine high-speed double-strand wire mill 150, put into operation at the Makeevka metallurgical combine, allowed an objective assessment of the optimality of the design parameters of its equipment, reliability and guaranteed life.

Computer-Based Design of Disc Brakes by Multi-Objective Form Optimization

2001 ◽  
Author(s):  
Sayed M. Metwalli ◽  
Hesham A. Hegazi
Keyword(s):  
Thermal Stresses ◽  
Optimization Procedure ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Objective Functions ◽  
Multi Objective ◽  
Disk Brake ◽  
Disc Brakes ◽  
Present Design ◽  
Computer Based

Abstract This paper is concerned with the application of CAD to design disc brakes using multi-objective form optimization. Temperature and disc (rotor) volume are two competing design objective functions used to obtain the optimum design parameters of disc brakes. The geometrical parameters affecting disk brake design such as the outer and inner disc diameters, disc thickness, pad thickness and pad angle are considered. The exponents of the two competing objective functions are to be optimized for better results. A sensitivity analysis of the two exponents (A and B) is used for this optimization procedure. The design vector for optimizing disc brakes includes the outer disc diameters, diameter ratio, disc thickness, and pad angle. The multi-objective formulation satisfies maximum attained torque; minimum actuating force; minimum thermal stresses; minimum temperature and minimum disc volume. A comparison with two previous optimization results indicates a marked improvement of the present design since previous results did not consider all design parameters or optimized objectives.

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