Nkk Corporation

Nippon Kokan Kabushiki Kaisha

Structural Metals, Inc.

Toa Steel Corporation

Giichi Matsuo

Susumu Okawa

Hiroshi Fujii

Koji Okushima

Akira Sakai

Akio Mehara

Soichi Aoyama

Fumiyuki Yamaguchi

Yuji Watanabe

Yuki Sugawara

Hidenori Anai

Noburu Masuda

Bunnosuke Ushioda

Tamiyasu Kosugi

Daizo Kobayashi

Nobuyoshi Hamura

Tsuyoshi Nakano

Motosuke Sugahara

Dayton Elley

Jeral Rains

A plurality of materials are rolled in an upstream stand. While the transfer speed of a succeeding material and the front end position thereof are detected, the transfer speed and the rear end position of a preceding material are detected by a measuring roll. The transfer speed of the succeeding material is controlled by adjusting at least the drive speed of the pinch rolls so that the front end of the succeeding material contacts the rear end of the preceding material at a specified position in a travelling welder. The rear end of the preceding material is joined with the front end of the succeeding material by flash-butt welding using the travelling welder to form a continuous material while letting the travelling welder move at a speed synchronous with the transfer speed of the continuous material. The welded portion on the continuous material is ground and/or cut to remove burrs therefrom. After removing the burrs, the continuous material is continuously rolled by a down-stream stand.

Apparatus for continuously rolling steel billets

A plurality of materials are rolled in an upstream stand. While the transfer speed of a succeeding material and the front end position thereof are detected, the transfer speed and the rear end position of a preceding material are detected by a measuring roll. The transfer speed of the succeeding material is controlled by adjusting at least the drive speed of the pinch rolls so that the front end of the succeeding material contacts the rear end of the preceding material at a specified position in a travelling welder. The rear end of the preceding material is joined with the front end of the succeeding material by flash-butt welding using the travelling welder to form a continuous material while letting the travelling welder move at a speed synchronous with the transfer speed of the continuous material. The welded portion on the continuous material is ground and/or cut to remove burr therefrom. After removing the burr, the continuous material is continuously rolled by a down-stream stand.

Apparatus for continuous rolling by welding the rolled materials at an intermediate stage of a rolling line

A flash-butt welder having a stationary head,and a moving head,a pair of electrodes,, and,coupled to each of the stationary and moving heads, respectively, power source transformers,through,are located at the stationary head,side. Four bus bars,through,connecting the power source transformers,through,with the electrodes,, and,are arranged at symmetrical positions surrounding a billet,. However, the number of bus bars,,and,, which are connected to the electrodes,and,at the moving head,side is half the total number of four bus bars.

Flash butt welding device

This apparatus has plural fixed grinding machines, which are installed along the direction of travelling line of billets. Facing pairs of grinders are equipped in a manner that the distances between each facing pair of grinders are gradually shorter along the travelling direction of the billets from the upstream side to the downstream side. In such a multiple-stage grinding machine, the burr on the welded part of the top and bottom side of the billet is ground sequentially by the grinders, and the burr on welded part of the right and left side of the billet is ground sequentially by the grinders.

Apparatus for removing burr by multiple-stage grinding machine

A method of continuous rolling comprises the steps of: forming a continuous billet 20 by joining a rear end of preceding billet 21 with a front end of succeeding billet 21 by flash-butt welding 3; removing burr on welded portions of the continuous billets 20; then rolling the continuous billet 20 in a rolling mill line 6; wherein locally cold portions produced by clamping at welding are reheated after removing the burr using a travelling induction-heating unit 5 running at a speed synchronously with a running speed of the continuous billet 20, which travelling induction-heating unit 5 is provided with induction-heating coils arranged at the same distance with that of the locally cold portions.

Method and apparatus for continuous rolling by reheating locally cold

Method and apparatus for continuous rolling by welding the rolled

A method for continuous rolling includes flash-butt welding to form a continuous billet by joining a rear end of a preceding billet with a front end of a succeeding billet, removing burrs from a welded portion of the joined part, and continuously rolling the joined continuous billet in a rolling mill group. The flash-butt welding step includes the use of two travelling welders arranged in series and spaced at a distance along the direction of movement of the continuous billet corresponding to the length of the billet being welded. The travelling welders synchronously move with the continuous billet, and separately and simultaneously weld the continuous billet to another billet by flash-butt welding so as to extend the length of the continuous billet.

Method and apparatus of continuous rolling using multiple synchronously

A continuous rolling method includes the steps of: flash-butt welding a rear end of a preceding billet with a front end of a succeeding billet; grinding the welded portion to remove a burr on the welded portion; heating the continuous billet; and rolling the continuous billet through a series of rolling mills. The flash-butt welding step includes joining the rear end of the preceding billet with the front end of the succeeding billet by using the stationary welder and joining the billets having at least double the length of the preceding billet by using the travelling welder. A continuous rolling apparatus includes a stationary flash-butt welder, a travelling flash-butt welder, a travelling grinding machine, an induction heater and a series of continuous rolling mills.

Continuous rolling method of billet and apparatus therefor

A hot saw cutting type continuous rolling method comprises casting two strand billets continuously; cutting the billets to predetermined length by hot saws; directly feeding billet portions obtained by cutting onto a rolling line via a line connecting device; continuously welding and joining the billets portions by a flash butt welder to form a continuous billet; grinding and removing burrs at the welded portion of the continuous billet by a grinding machine; and continuously rolling the billet by a rolling mill group, after heating the continuous billet to a higher temperature by an induction heater. A hot saw cutting type continuous rolling apparatus is provided for performing the above-described method.

Hot saw cutting type continuous rolling method and apparatus thereof

Billets 10 which were continuously cast in a continuous casting machine 1 are directly supplied to a joining line 12. Scale on the billets is removed by a de-scaling apparatus 3. Then the rear end of a preceding billet is welded with the front end of a succeeding billet using a travelling flash butt welder 4 to produce a continuous billet. A burr on the welded part 15 is removed by grinders 51-53 in a travelling burr-removing apparatus 5. The continuous billet is heated in an induction heater 6, and then is continuously rolled in a rolling mill line.

Continuous rolling method

A method for removing burrs in a continuous rolling process including the steps of joining the rear end of a preceding billet with the front end of a succeeding billet using a flash butt welding method while both billets are moving, and grinding a burr on the welded part of the joined portion using a plurality of grinders while the billets are moving and while rotating the grinders and moving the grinders synchronously with the travelling speed of the billets. A grinding machine for continuously rolling a round billet includes a travelling body shuttling along the direction of movement of the round billet, a turret ring rotatably supported by the travelling body, and a plurality of grinding devices arranged in a movable manner within a radius of the turret ring, wherein the grinding devices include grinders which are set at a tilted angle relative to the center axis of the rotatable turret ring. A grinding machine for continuously rolling a rectangular billet includes a travelling body moving along a moving direction of the rectangular billet, two pairs of grinding devices located at a front side and a rear side, respectively, of the travelling body and having grinders which rotate on a plane facing the rectangular billet and along a longitudinal direction of the rectangular billet, a moving device for moving the grinding devices in a right angle direction relative to the rectangular billet, and a device for moving the grinders to come close to and apart from the rectangular billet.

Method and apparatus for removing burrs from joined billets in a

This invention relates to a method and apparatus for simultaneously forming four metal rounds and includes disclosure of two pair of forming rollers, a preslitter roller pair and two pair of slitting rollers, the dimensioning of the ridges and grooves of which, in combination, serve to separate an entering bar into four strands of substantially equal area for simultaneous forming into metal rounds.

Method and apparatus for simultaneously forming at least four metal

A multiplicity of cooled steel products, after having been severed from an as-rolled steel, divided into sectional bars and delivered to and accumulated on a cooling hearth, are taken from the cooling hearth, and delivered to a multi-bar straightening machine. There, simultaneously with straightening, a predetermined distance from the leading ends of the bars is measured simultaneously, the forward movement of the bars is interrupted after they have advanced by said measured distance, and said forward portions are cut.

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Yokohama, Japan

Giichi Matsuo