Creation and Fundamental Characteristic of a New Friction Joining Method

Horii, Kenji; Funamoto, Takao; Yoshimura, Yasutsugu

doi:10.9773/sosei.50.139

Cited by 6 publications

(2 citation statements)

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“…133,134) In addition, the endless hot strip rolling mills were operated newly, and as for joining technology of a rough bar which was a key technology, the friction welding technology using strong shear deformation was developed. 135) There are an induction welding technology and a laser welding technology except this technology for the joining technology. These three joining technologies became ones developed in Japan.…”

Section: Rolling Theory After 2000mentioning

confidence: 99%

Rolling Technology and Theory for the Last 100 Years: The Contribution of Theory to Innovation in Strip Rolling Technology

Ataka

2015

ISIJ International

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Rolling theory has made remarkable progress for the last 100 years. The history of rolling theory is described in this report, comparing rolling theory with innovation of strip rolling technology. In Japan, computer control system started to be introduced to iron and steel company in 1960s. Therefore, research of rolling theory became in dispensable. Before 1960, it was published mainly in the Western countries. It is said that two-dimensional rolling theory had been completed. First of all, in Japan flow stress was investigated to calculate rolling load precisely, and approximate three-dimensional analysis for deformation of rolled strip was researched to predict the distribution of rolling pressure in width direction, which made up crown and shape of rolled strip. After that, FEM (finite element analysis method) replaced the approximate three-dimensional analysis, by which three-dimensional deformation of rolled strip could be calculated precisely. The results of these researches supported the innovation of crown and flatness control technology and the invention of many rolling mills with high functional ability for crown and flatness control. Next, the continuous strip rolling theory was completed chiefly in Japan, by which the static and dynamic characteristics of tandem strip mills could be understood. It is said that the continuous rolling technology for cold and hot strip tandem mills would not be realized without the continuous strip rolling theory.

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Section: Rolling Theory After 2000mentioning

confidence: 99%

Rolling Technology and Theory for the Last 100 Years: The Contribution of Theory to Innovation in Strip Rolling Technology

Ataka

2015

ISIJ International

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“…However, continuous rolling has not been applied to high tensile strength steel because of a lack of joint strength. In addition to the induction heating method, laser welding methods 2) and shear joining methods [3][4][5] can also be used as hot-rolled sheet bar joining techniques, but no examples of the application of either method to high tensile strength steel have been reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of Joining Conditions on Residual Oxide in Joining with Induction Heating

Okazaki,

Ueno,

Kijima

et al. 2023

Mater. Trans.

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In No. 3 hot strip mill at JFE Steel East Japan Works (Chiba), mild steels are produced by the endless rolling process, in which rough rolled bars are joined and rolled continuously in the finishing mill. However, this process is not applied to high tensile strength steels because the alloy elements contained in those steels, such as silicon and manganese, form an oxide layer at the joining interface, disrupting the joining process. In laboratory joining tests, heating the joining surface until it melted resulted in discharge of the oxide layer from the interface, and steels that form oxide with a low melting temperature were successfully joined. A FEM flow analysis revealed that the viscosity of the oxide is the most important parameter for discharge. The low melting temperature of the oxide leads to low viscosity, resulting in the discharge of the oxide layer.

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Creation and Fundamental Characteristic of Super Deformation Joining Method

Horii¹,

Funamoto²,

Yoshimura³

2009

SOSEI-TO-KAKOU

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The endless hot rolling concept was introduced to meet the demand for diverse hot-rolled steel sheet products produced by a cost-effective process compared with the conventional batch-type process. Endless rolling involves joining the head and tail ends of two bars following their rough rolling. By applying solid-state joining utilizing the high temperature of the joined materials for endless hot rolling, a new joining technology was proposed to instantaneously obtain a sound and uniform joint as the base metal using relatively simple equipment. This report presents the super deformation joining method, which was developed from a study on remedying the friction joining method. In this method overlapped materials are sheared incompletely to obtain a sound joint. In laboratory tests, in the presence of scale on the overlapping surface, the joint strength was approximately half that of the base metal, and the joint area was about 60 %, although the joint strength was approximately the same as that of the base metal when there was no surface scale. Obtaining a sound joint under actual hot rolling conditions, in the presence of scale on the overlapping surface remains a problem to be overcome.

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Creation and Fundamental Characteristic of a New Friction Joining Method

Cited by 6 publications

References 0 publications

Rolling Technology and Theory for the Last 100 Years: The Contribution of Theory to Innovation in Strip Rolling Technology

Rolling Technology and Theory for the Last 100 Years: The Contribution of Theory to Innovation in Strip Rolling Technology

Influence of Joining Conditions on Residual Oxide in Joining with Induction Heating

Creation and Fundamental Characteristic of Super Deformation Joining Method

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