Failure analysis of rolling mill stand coupling

Domazet, Željko; Lukša, Francisko; Šušnjar, Marko

doi:10.1016/j.engfailanal.2014.09.002

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…This loading pattern negatively affects the strength of the main line parts and nodes, which concerns both one-time loading (overload) and fatigue phenomena. Spindle blades and rolls break, since elastic torque oscillations reduce the strength of mill parts [17].…”

Section: Causes Of Intensive Wear Of Spindle Jointsmentioning

confidence: 99%

Telemetry System to Monitor Elastic Torque on Rolling Stand Spindles

Voronin,

Loginov,

Gasiyarova

et al. 2024

JMMP

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This article outlines the relevance of building online telemetry systems for online monitoring of the technical conditions of rolling mill equipment. Electromechanical systems of the horizontal stand of the plate Mill 5000 are described, when operating in harsh conditions caused by the shock loading when workpieces enter the stand. It is noted that dynamic torque overloads, exceeding the rated motor torque by many-fold, cause the fatigue failure of spindle joints and breakage of rolls. In this regard, the development and implementation of systems for monitoring the elastic torque on spindles are extremely urgent. This issue has long been studied, but the references provide no information on the building principles and hardware composition of such systems. The use of strain gauges connected according to a balanced bridge circuit to measure the elastic torque is justified. This paper’s contribution is the proposed modular principle for building a telemetry monitoring system based on the analysis of known techniques for measuring and transmitting diagnostic data. The developed system structure is provided and the concept of data transfer and processing are explained. This article suggests the inductive power supply of a measuring unit mounted on a shaft without the use of batteries. A hardware structure was developed to be applied in a system for measuring, transmitting, and visualizing signals proportional to the elastic torque, manufactured on the basis of data measuring instruments by leading companies. The specifics of placement and connection of strain gauges are considered. The hardware providing a wireless power supply to the signal encoder and digital data transfer between the transmitter and receiver is described. The results of implementing the system on Mill 5000 are provided. The installation of a telemetry ring and a receiving head for the inductive power supply and data reception is shown. An experimental assessment of the elastic torques occurring when workpieces enter the cage was obtained by implementing a drive control algorithm which provided biting in the drive acceleration mode. The reliability of measuring the elastic torque with an error not exceeding ±5% and the reduction of dynamic loads on the spindle by 1.3–1.5 times due to the elimination of impacts from closing angular gaps in spindle joints was confirmed. This increases the service life of mechanical equipment and reduces the cost of eliminating the accident aftermath. The prospect of modifying the developed system into a cyber-physical system for monitoring the rolling mill’s mechatronic equipment conditions is shown.

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Section: Causes Of Intensive Wear Of Spindle Jointsmentioning

confidence: 99%

Telemetry System to Monitor Elastic Torque on Rolling Stand Spindles

Voronin,

Loginov,

Gasiyarova

et al. 2024

JMMP

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“…2) and second is square (see fig. 3) [Hladky 1991, Baoshou 2012. Alternative with circle cross section use key to prevent the roll to slip in its seat.…”

Section: Open Seats and Clampsmentioning

confidence: 99%

“…There are several possible design variants of machine. This article deals with rolling mill with two working rolls [Hladky 1969]. Next common variant is a machine with flat tools [Malinkin 1972, Tomczak 2018.…”

Section: Introductionmentioning

confidence: 99%

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Removable Mounting of the Rolling Machines’ Working Rolls

Hlavac¹,

Vydrzel²,

Dekastello³

et al. 2021

MMSJ

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The work is focused on the design solution of fixing the exchangeable working rolls into cross-wedge rolling machine. The tools are clamped to the cylinders. In case of technology change, the tools must be replaced. Tools can be changed directly on the machine, this is a non-productive time. Another way to change tools is to replace entire cylinders. The diameter of the rollers is large, so the rollers themselves cannot be pulled out through the side hole, as is the case with a rolling mill. There are several ways to connect the middle part of the cylinders to the pins located in the stands. The work compares connections with a lid and a square or cylindrical shaft and variants in a singlesided extension able shaft with a conical or spherical surface. The aim of the work is to compare the stiffness of connection methods.

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“…Rolls were loaded by rolling forces [2] between the roll and rolling stock and corresponding rolling torque ([3]; Table 1). The rolling time in passes corresponds loading time.…”

Section: Roll Neck Fracturementioning

confidence: 99%

Influence of roll neck design and inlet rolling temperature on roll neck service life

Lukša

Domazet

2018

Ironmaking & Steelmaking

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Roll neck fracture was the result of the rotational-bending fatigue due to uncontrolled decreasing of the inlet rolling temperature. Three groups of design modifications of the roll neck have been considered to decrease maximum local stresses and to increase roll service life. In order to reduce energy consumption, influence of three different inlet rolling temperatures has also been considered. The negative influence of rolling temperature decreasing on roll fatigue life can be completely compensated by the adequate shape of roll neck and in that way reduce energy consumption and overall costs.

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Failure analysis of rolling mill stand coupling

Cited by 9 publications

References 1 publication

Telemetry System to Monitor Elastic Torque on Rolling Stand Spindles

Telemetry System to Monitor Elastic Torque on Rolling Stand Spindles

Removable Mounting of the Rolling Machines’ Working Rolls

Influence of roll neck design and inlet rolling temperature on roll neck service life

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