Nakata Manufacturing Co., Ltd.

Takeyuki Sato

Feizhou Wang

Tomoyasu Nakano

Hiroaki Yabuta

Jilong Yin

Takeshi Watanabe

Mitsuru Nakata

Takamitsu Miura

Manabu Ninomiya

Shunichi Haruyama

Hiromasa Kitayama

Changing of a horizontal roll in a horizontal roll stand involving readjustment of an amount of pressing is to be done readily and promptly. In order to achieve this, a horizontal roll standwith a pair of built-in upper and lower horizontal rollsis configured to retreat toward one side across a forming line. A fixed standstands upright on a counter-retreating side of the forming line. An overhang partof the fixed standjutting out over the forming line is provided with a pressure devicethat applies a pressing force to the horizontal rolls. The horizontal roll standincludes a horizontal roll housingwith an opened top, receives the pressing force from the pressure devicevia the opened top, and retreats to the outside of the forming line while the pressure deviceis left on the forming line. The overhang partof the fixed standis engaged with the horizontal roll housingof the horizontal roll standto support the horizontal roll housingin the forming line.

Roll forming machine

To manufacture a high-quality welded pipe, there is provided a welded pipe manufacturing apparatus for manufacturing a welded pipe by bending a metal plate and welding butting end portions of the metal plate. The welded pipe manufacturing apparatus includes a bending unit that bends the metal plate, a light emitter that emits directional light to an inner surface of the metal plate bent by the bending unit, an image capturing unit that captures light emitted by the light emitter and reflected by a surface of the metal plate, and an adjustment assistance unit that assists adjustment of the bending unit in accordance with a shape of the reflected light.

Welded pipe manufacturing apparatus and welded pipe manufacturing method

A pipe cutting machine comprises: rotary blades in a pair, with a plane at a right angle to a center line of a pipe, the rotary blades being arranged to face each other on both sides of a y axis in such a manner that blade edges of the rotary blades overlap each other in an x-axis direction; a straightforward driving mechanism that drives the rotary blades straightforward in opposite directions of a y-axis direction so as to make the rotary blades pass each other on the x axis and in the vicinity of the x axis; and power direction conversion mechanisms that move the rotary blades outwardly to get farther from the y axis for avoiding interference between the blade edges when the rotary blades pass each other on the x axis and in the vicinity of the x axis.

Pipe cutting machine

An object is to prolong the life of a ring tool, and improve the productivity of a welded pipe. A ring tool unit is held in a downstream-side end portion of a mandrel to be inserted into a welded pipe currently being manufactured from the upstream side of a welding position, and is used as a cutting tool for continuously cutting a bead produced on the inner surface of the welded pipe, wherein the ring tool unit is formed by fitting a ring tool having a ring-like blade in a sleeve having a circular hole for holding the outer circumference of the ring tool.

Ring tool unit, method for manufacturing the same, sleeve, and mandrel

In a forming apparatus, inner frames are arranged in a forming roll stand so as to move up and down. Mechanical structures of convexo-concave engagement are provided on opposed faces between respective roll chocks and yokes and the inner frames. After connection with a pressing device is released, the roll chocks and yokes are guided utilizing the moving-downward motion of the inner frames, and a stack body is formed in series so as to be withdrawn from the roll stand. The stack body is disassembled utilizing the moving-upward motion of the inner frames, and the roll chocks and yokes can be guided to the desired positions inside the stand and locked.

Growing community of inventors

Osaka, Japan

Takeyuki Sato