Primetals Technologies Japan, Ltd.

Mitsubishi-hitachi Metals Machinery, Inc.

Mitsuru Onose

Shinichi Kaga

Noriaki Tominaga

Takehiko Saito

Yasutsugu Yoshimura

Satoshi Hirano

Keiichi Sato

Yujiro Watanabe

Satoru Zenitani

Akihiro Satou

Toyotsugu Masuda

Hirotoshi Tagata

Ichirou Maeno

Ikuo Wakamoto

Hirotomo Tagata

Motoyuki Fujii

Hisayoshi Ishii

Hironori Shimogama

Motoyuki c/o Mitsubishi-Hitachi Metals Machinery Inc Fujii

Hisayoshi c/o Mitsubishi-Hitachi Metals Machinery Inc Ishii

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.

In an inspection device for inspecting front and back surfaces of a strip material rolled by a rolling machine, both ends of the strip material along a longitudinal direction of the strip material are claimed by two pairs of clamping devices and the front surface of the back surface of the strip material is pressed at an optional position between the two pairs of the clamping devices by at least one pressing device. Thus, after clamping the strip material, the two pairs of the clamping devices are not displaced along the longitudinal direction of the strip material. A function for applying tensile stress to the strip material and a function for clamping the strip material are individually and separately provided so that the inspection device can be simplified. By pressing the strip material at a point between the two pairs of the clamping devices, at least one of pressing devices can be down sized. It is superior in view of an economical reason. It is possible to set tensile stress at high accuracy and minimize tensile stress variation with respect to a tensile stress level previously set in an operation for inspecting front and back surfaces of the strip material. Therefore, it can be reduced a risk that the strip material is broken and it can be provide a safety inspection device with high reliability for inspecting front and back surfaces of the strip material. Further, it is possible to provide an inspection device for inspecting front and back surfaces wherein a warp of the strip material along a width direction thereof can be adjusted and wrinkles occurred on the strip material by clamping with the clamping devices are controlled.

Device for inspecting front and back surfaces of a strip material and method thereof

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Tokyo, Japan

Mitsuru Onose