ball mill quarrying equipment in south africa

ball mill quarrying equipment in south africa

Roll Eccentricity Control for Strip Rolling Mills

1987-7-1  Roll eccentricity is of major significance because it may be ampI ified by the "gaugemeter" control system and result in more serious thickness errors along the entire product length than would have been present wi thout the "gaugemeter" control.

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An Eccentricity Analysis Method Under Time-Varying

2001-9-1  Although roll eccentricity signal is a periodic function of roll angle, however, it is not that of time unless the rotational velocity of roll is constant. This implies that, roughly speaking, the frequency of roll eccentricity signal changes continuously over the job period. This situations motivates a conversion algorithm developed in Section 2.1.

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Strip Thickness Control of Cold Rolling Mill with Roll

2013-11-12  Figure 3. Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation. In the model, roll eccentricity modifies Equation (5) as :

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WINDER ROLL VIBRATION Winder Vibration Related to

2014-7-22  eccentricity of a roll when it is being wound. The model shows that there is no effect until the wavelength of the variation is equal to the circumference of the roll being wound and at this diameter there is a step change in eccentricity. This model explains some of the vibration effects seen in the case study. INTRODUCTION

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Neural network for identification of roll eccentricity in

1996-6-15  The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.

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Frequency-adaptive Backup-Roll Eccentricity

2012-1-1  The presence of backup roll eccentricity can be modeled as a roll radius that varies with the angular position BR : rBR (BR ) = rBR 0 + rBR (BR ). Usually, the work-roll eccentricity is several orders of magnitude smaller than backup roll eccentricity and. according to the HGC fequency capabilities, it is eventually compensated only at very low speed.

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An adaptive on-line sensor for roll eccentricity

1992-7-1  A common problem associated with this process is that the back-up and work roils are not perfectly circular in shape. In other words the rolls are eccentric. The roll eccentricity effect will, under normal constafit operating forces, result in steel strip with undesirable thickness deviations.

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Method of measuring and compensating roll

In Step 1 of the foregoing off-line eccentricity identification method, the work rolls 21,22 are pressed to exert a rolling force within 1500 to 2000 tons, and the angular velocity thereof is about 40 rpm. The variation of this rolling force, which is due to the backup roll eccentricity, is measured in Step 2.

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Gauge control using estimate of roll eccentricity

A method of controlling a rolling mill in which eccentricity of one or more of the roll assemblies of the mill and variations in thickness and/or hardness of material entering the mill ordinarily cause variations in the gauge of the material that exits from the mill, the eccentricity of the roll assembly or assemblies providing the material exiting the mill with a cyclic component, while the entering variations in thickness and/or

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A Multi-roll Eccentricity Controller for Strip Rolling

This paper describes an improved strip thickness controller design for a metal strip rolling mill with two work-rolls supported by larger diameter backup-rolls. The strategy is based on a model that represents the effects of multiple roll eccentricities, the plastic deformation process and elastic strains in the mill stand components. The strategy overcomes many of the fundamental difficulties

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Gauge control using estimate of roll eccentricity

The method involves the steps of slowly eliminating the cyclic effects of roll eccentricity on the exit gauge of the material while simultaneously correcting for the adverse effects of incoming gauge variations. This is accomplished by continually estimating a change in exit gauge using the standard gaugemeter equation but correcting the

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Neural network for identification of roll eccentricity in

1996-6-15  The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.

get price

A novel real-time fuzzy-based diagnostic system of

Roll eccentricity is one of the most important and, consequently, any action directed to removing roll eccentricity or its effects will greatly improve thickness quality and reduce production costs.For instance, after the rolling of a strip, the mill operators may find that the thickness measured by the X-ray gauge at the exit of the FHSM is

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Self-Tuning Regulator for Roll Eccentricity of Cold

1983-1-1  This paper introduces a new type self-tuning regulater to overcome the influence of roll eccentricity of the first stand, which use the rolling force

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A novel real-time fuzzy-based diagnostic system of

Roll eccentricity is one of the most important and, consequently, any action directed to removing roll eccentricity or its effects will greatly improve thickness 1) whether defects come from roll eccentricity; quality and reduce production costs. 2) for a defect caused by roll eccentricity, which roll or For instance, after the rolling of a

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US4222254A Gauge control using estimate of roll

A method of controlling a rolling mill in which eccentricity of the roll assemblies of the mill and variations in the thickness and/or hardness of material entering the mill ordinarily adversely affect the gauge of the material leaving the mill. The method involves the steps of slowly eliminating the cyclic effects of roll eccentricity on the exit gauge of the material while simultaneously

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A Multi-roll Eccentricity Controller for Strip Rolling

This paper describes an improved strip thickness controller design for a metal strip rolling mill with two work-rolls supported by larger diameter backup-rolls. The strategy is based on a model that represents the effects of multiple roll eccentricities, the plastic deformation process and elastic strains in the mill stand components. The strategy overcomes many of the fundamental difficulties

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Automatic eccentricity compensation

2017-9-21  the roll eccentricity: A) force affected by roll eccentricity (kN). B) compensator’s trim to HGC (mm). 2 The core of the D-REC (Danieli Roll Eccentricity Compensation) is the FAFC (Frequency Adaptive Feed-forward Cancellation) algorithm: for identifying online the correct frequency, the amplitude and the phase of the correction. Roll ovality

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Maya calmound 博客园

2013-9-16  Eccentricity 离心率0.4 Specular Roll of高光反射偏移 Reflectcivity反射 Special Effects Glow Intensity 灰光强度 高光颜色加入ramp---颜色(白灰暗灰)选Sample Info加入other facingRatio--vCord 反射颜色 ramp(灰黑)选Sample Info加入other facingRatio--vCord

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by

2021-5-16  CONTAINING UNBALANCE ECCENTRICITY AND PERMANENT RESIDUAL BOW by A. S. Maxwell Maintenance Specialist, Balancing and Vibration and A. F. P. Sanderson Maintenance Engineer, Mechanical System Maintenance Division Ontario Hydro Toronto, Ontario, Canada Stewart Maxwell was educated at the Royal Technical College, Salford En­

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The effects of visual depth and eccentricity on manual

The effects of visual depth and eccentricity on manual bias, induced motion, and vection. The relationship between the effects of visual-surround roll motion on compensatory manual tracking of a central display and the perceptual phenomena of induced motion and vection were investigated. To determine if manual-control biases generated in

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A novel real-time fuzzy-based diagnostic system of

Roll eccentricity is one of the most important and, consequently, any action directed to removing roll eccentricity or its effects will greatly improve thickness 1) whether defects come from roll eccentricity; quality and reduce production costs. 2) for a defect caused by roll eccentricity, which roll or For instance, after the rolling of a

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A Multi-roll Eccentricity Controller for Strip Rolling

This paper describes an improved strip thickness controller design for a metal strip rolling mill with two work-rolls supported by larger diameter backup-rolls. The strategy is based on a model that represents the effects of multiple roll eccentricities, the plastic deformation process and elastic strains in the mill stand components. The strategy overcomes many of the fundamental difficulties

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The Effects of Lateral Eccentricity on Failure Loads and

2014-5-13  The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. Injuries were diagnosed by a spine surgeon and scored. Classification functions were developed using discriminant analysis. The high eccentricity group had lower peak axial forces (1544 ±629

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Roll Eccentricity Extraction Method Based on

Roll eccentricity is ubiquitous in strip mills, which has a periodic impact on the strip thickness difference. Roll eccentricity compensation is an important part of the automatic gauge control system. Most roll eccentricity compensations extract the roll eccentricity based on

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Technological control for cold rolling processes

2021-2-16  Roll eccentricity control Irregularities in roll geometry cause periodic varia-tions in the roll gap, which can lead to variations in thickness of the rolled product. The predominant sources of these variations are the backup rolls of the stand. The function compensates for periodic disturbance from geometric asymmetries on the backup rolls. An

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Calender Gauge Control Tips FACTS, Inc

2013-6-13  Calender Roll Eccentricity Calender rolls must be round and free of run-out at ambient temperature. Any run-out of the Cord Spacing Effects on Calendered Gauge Cord spacing has a significant impact on overall sheet gauge and quality. 1. Keep the calender running stops cause the rolls to become egg shaped and introduce

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Target eccentricity effects for defensive responses

2019-1-5  rotations with large increases in visual field target eccentricity and involving incongruent responses observed in the AWAY condition. In chapter 4 we examined the effects of practice in the TOWARD or AWAY condition on performances in both conditions. We observed a shorter RT and premotor RT after 6 days of

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Maya calmound 博客园

2013-9-16  Eccentricity 离心率0.4 Specular Roll of高光反射偏移 Reflectcivity反射 Special Effects Glow Intensity 灰光强度 高光颜色加入ramp---颜色(白灰暗灰)选Sample Info加入other facingRatio--vCord 反射颜色 ramp(灰黑)选Sample Info加入other facingRatio--vCord

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A Review on Chatter Analysis in Cold Rolling process

2018-12-12  forward slip’). This negative slip occurs due to excessive roll-bite lubricity and/or excessive entry tension 14 Excessive roll bite friction 15 Coupling of adjacent stands by strips 16 Improperly ground work rolls 17 Defective work-roll bearings: (Radial loads, when applied to bearings through roll bending or unbalance or eccentricity of the

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