Primetals Technologies Japan, Ltd.

Mitsubishi-Hitachi Metals Machinery, Inc.

Shinichi Kaga

Takehiko Saito

Noriaki Tominaga

Yasutsugu Yoshimura

Satoshi Hirano

Keiichi Sato

Yujiro Watanabe

Takehisa Okuda

Mitsuru Onose

Satoru Zenitani

Akihiro Satou

Takahiro Yagi

Akihiro Yamamoto

Hirotoshi Tagata

Ikuo Wakamoto

Hirotomo Tagata

Takayuki Honda

Masaki Kobayashi

Tetsuya Nakano

An ironing plate is attached to a friction stir welding apparatus in such a manner that the ironing plate surrounds an outer peripheral portion of a rotating tool and does not rotate together with the rotating tool, an inside diameter of a portion of the ironing plate into which the rotating tool is inserted is larger than the diameter of the rotating tool, and a material inflow path through which an excessive material of two metallic plates flows in is formed between the ironing plate and the rotating tool when the ironing plate is disposed to surround the outer peripheral portion of the rotating tool.

Ironing plate for friction stir welding apparatus and friction stir welding apparatus including the same, and friction stir welding method

A pair of upper and lower pressure rollersis disposed so that their axesare tilted in a horizontal plane in respective directions opposite to each other with respect to a straight line perpendicular to a welding line of a joint portion J. The pressure rollersare positively driven by corresponding electric motorsto thereby roll the joint portion. Thus, steps defined at the joint portion can be smoothed and a step gradient can be reduced to ensure a high degree of joint strength. Thus, it is possible to prevent a step portion from being interfolded into the base material of the meal plates

Metal plate joining method and apparatus

Cold rolled material manufacturing equipment includes: an unwinding device for unwinding a hot rolled coil after acid pickling; a joining device, disposed on the exit side of the unwinding device, for joining the tail end of a preceding coil to the leading end of a succeeding coil unwound from the unwinding device; a rolling mill for continuously rolling the coils in one direction; a strip storage device, disposed between the joining device and the rolling mill, for storing a strip to perform continuous rolling during the joining; a strip cutting device for cutting the strip to a desired length; a winding device for winding the rolled coil; a transport device for transporting the coil to the unwinding device so that the coil is rolled a plurality of times; and a rolling speed control device controlling a rolling speed during the joining to a speed lower than a steady rolling speed.

Cold rolled material manufacturing equipment and cold rolling method

Mash seam welding is performed to weld metal plates with thicknesses of 2 mm or more to stabilize the strength of a joint portion, reduce uneven parts of the joint portion, and ensure high strength and reliability of the joint portion. First, two metal plates, clamped with first and second clamping devices, are placed to overlap each other at their end portions. The overlapping portions (L) of the metal plates are pressed together with a pair of upper and lower electrode wheels while welding currents flow to continuously weld the overlapping portions (L) and join the metal plates. The pressing forces applied to the electrode wheels are controlled so that upper and lower welding forces acting upon the overlapping portions are equal to each other during the time when the overlapping portions are continuously welded.

Mash seam welding method and apparatus

Cold rolled material manufacturing equipment comprises: an unwinding device for unwinding a hot rolled coil after acid pickling; joining means, disposed on the exit side of the unwinding device, for joining the tail end of a preceding coil to the leading end of a succeeding coil unwound from the unwinding device; a rolling mill for continuously rolling the coils in one direction; a strip storage device, disposed between the joining means and the rolling mill, for storing a strip to perform continuous rolling during the joining; a strip cutting device for cutting the strip to a desired length; a winding device for winding the rolled coil; transport means for transporting the coil to the unwinding device so that the coil is rolled a plurality of times; and a rolling speed control device for controlling a rolling speed during the joining to a lower speed than a steady rolling speed.

An on-line roll grinding method for a work roll, which can decrease an overshoot, by which the pressing load of a rotating grinding wheel on a work roll exceeds a set grinding pressing load, is provided. This method is an on-line grinding method for a work roll, adapted to press a rotating grinding wheel () having elasticity against a work roll () of a rolling mill to grind the work roll, wherein when the pressing load of the rotating grinding wheel () reaches a set load F, which has been set beforehand, after the rotating grinding wheel () contacts the work roll (), the forward velocity of the rotating grinding wheel () is reduced to decrease an overshoot by which the pressing load of the rotating grinding wheel () on the work roll () exceeds a set grinding pressing load F.

On-line grinding method for work roll

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Tokyo, Japan

Shinichi Kaga