Koike Sanso Kogyo Co., Ltd.

Gunma Koike Co., Ltd.

Voike Sanso Kogyo Co., Ltd.

Akira Furujo

Tetsuo Koike

Masatoshi Motoyama

Ryuta Hirai

Kazuya Kashimata

Seiji Mizuno

Tetsuya Iizuka

Ryuji Kobayashi

Nobuo Ito

Masahiro Mogi

Go Sasaki

Takayuki Takarada

Kayoko Morishita

Hisahito Inagawa

Etsuo Nakano

Yasuyuki Takarada

Kazuomi Kusumoto

Inner nozzle for plasma torch

The present invention relates to a cutting method for cutting an upper edge and a lower edge of a cutting plane into a curved shape, when a cutting object is cut by supplying plasma gas to the periphery of an electrode of a plasma torch and ejecting plasma arc from a nozzle. In order to melt the upper edge and the lower edge of the cutting plane to form a curved shape, at least one condition selected from plural conditions including a cutting electric current, cutting speed, height of a plasma torch, angle of the plasma torch, and flow rate of plasma gas upon performing the vertical cutting for forming the upper edge and the lower edge of the cutting object substantially at right angles is changed.

Plasma cutting method and plasma cutting apparatus

Outer nozzle for plasma torch

[PROBLEMS] To reduce the generation of fume in cutting a material to be cut typified by a steel plate with plasma. [MEANS FOR SOLVING PROBLEMS] A plasma cutting method comprising spraying a plasma arc directed through a material to be cut from a plasma torch nozzle to cut the cutting material, wherein a plasma arc formed by supplying a mixed gas as a plasma gas composed of a single gas or a plurality of gases selected from halogen gases and rare gases belonging to up to the second row elements of the periodic table and a hydrogen gas, and oxygen-, argon- or nitrogen-containing gas to a part around an electrode, and electrifying a part between the electrode and the nozzle or between the electrode and the cutting material is sprayed toward the cutting material to cut the cutting material, or wherein a single gas or a plurality of gases selected from halogen gases or rare gases belonging to up to the second row elements of the periodic table and a hydrogen gas, together with the plasma arc composed mainly of an oxygen, argon or nitrogen gas, is sprayed toward the cutting material to cut the cutting material.

Plasma cutting method for cutting a carbon steel plate and for reducing fine particles

Electrode for plasma torch

Plasma torch body

Electrode for a plasma torch

Nozzle for plasma torch

It is an object of this invention to provide a laser piercing method capable of reducing the time required for piercing a workpiece and satisfactorily forming a pierced hole. This invention provides a laser piercing method, in which a piercing process is performed by setting the level of a nozzle during piercing execution to a value higher than the level of the nozzle during cutting execution, setting the pressure of the assist gas during piercing execution to a value higher than the pressure of the assist gas during cutting execution, and setting the level of a focal point O of the laser beam during piercing execution lower than the level of a focal point O of the laser beam during cutting execution and subsequent to the piercing process a cutting process for cutting a workpiece is performed by setting the level of the nozzle the pressure of the assist gas, and the level of the focal point O of the laser beam to a value prescribed for cutting execution, respectively.

Laser piercing method

The present invention relates to a plasma processing apparatus capable of obtaining a satisfactory plasma arc and a processing method used by this plasma processing apparatus. The plasma processing apparatus is constructed to vary an electric current or a voltage during start up at a fixed period for a fixed time. The plasma processing apparatus has a plasma power source capable of controlling an electric current or a voltage applied to a plasma torch, and an electrode and a nozzle are communicated by means of an electrification in the plasma torch. In a method for performing a plasma process by a plasma processing apparatus, a mixing gas has a ratio of Hydrogen to Argon in a range from 5 to 20 Vol %, and a frequency of a plasma electric current is controlled in a range from 10 to 30 KHz.

Plasma processing apparatus and method

Growing community of inventors

Tokyo, Japan

Akira Furujo