Kawasaki Jukogyo Kabushiki Kaisha

Nissin Electric Co., Ltd.

Akio Tanaka

Mizuo Edamura

Satoru Kunise

Satoshi Furuitsu

Yasuo Suzuki

Satoshi Ruruitsu

Takeshi Goto

This invention relates to a retort type apparatus for ion-nitriding treatment which is so designed as to effect heating and nitriding of a workpiece at high thermal efficiency, with excellent uniformity and in a short time, by using both glow discharge and heat produced by a heating element.

Ion-nitriding apparatus

Apparatus for a wire spray coating method including a capacitor connected with an electric power source to be charged thereby. A gap switch having discharge electrodes which are spaced apart from each other so that a discharge is produced under a voltage applied by the capacitor. Wire receiving terminals which are spaced apart to receive a length of wire of coating material therebetween, the terminals being connected with the capacitor so that the charge of the capacitor is applied to the terminals through the switch. The discharge electrodes being maintained at a fixed distance so that a discharge across the electrodes is readily produced when the electrodes are supplied with the voltage from the capacitor. A voltage dividing element for applying a fraction of the voltage across the capacitor to the discharge electrodes and the remainder of the voltage to the wire receiving terminals when the wire is not in position between the terminals, but for applying substantially a total voltage of the capacitor when the wire is in a position between the terminals.

Apparatus for wire explosion spray coating

An ion-nitriding process in which workpieces are subjected to a two-step glow discharge in a nitrogen and hydrogen atmosphere, there being a larger nitrogen to hydrogen ratio in the second step.

Ion-nitriting process

The present invention provides an ion-nitriding process wherein a workpiece having at least one aperture is subjected to a DC voltage in an atmosphere of nitrogen-containing gas, characterized in that a first nitriding step is carried out under a vacuum which is strong enough to suppress arc discharge on the workpiece, and a second nitriding step is carried out under a weaker vacuum as compared to that in the first step so that glow discharge is produced even in the aperture of the workpiece.

Ion-nitriding process

An ion-nitriding apparatus which is designed so that in heating and nitriding a workpiece by the combined use of glow discharge and heat generated by a heat-producing element, uniform temperature distribution of the workpiece during glow discharge can be obtained, thereby preventing overheating of the workpiece and realizing uniform heating and uniform nitriding of the workpiece.

Apparatus for ion-nitriding treatment

An ion-nitriding apparatus wherein heating and nitriding of workpieces can be carried out at high thermal efficiency, with excellent uniformity and in a short time by the combined use of glow discharge and heat generated by a heat-producing element. Heating efficiency can be raised in heating of workpieces by lessening the heat value to be released out of the furnace, and overheating of workpieces can be prevented in nitriding of them by increasing the heat value to be released out of the furnace in proportion to the increase of glow discharge output, and thus the nitriding efficiency can be raised.

This invention relates to an apparatus for continuous glow discharge nitriding treatment whereby a workpiece is treated while it is being transferred in a vacuum chamber. It comprises a heating means to heat the workpiece up to the suitable temperature at which glow discharge nitriding is going on steadily, a heat-retaining means to keep the heated workpiece at said temperature and a discharge means to carry out discharge nitriding by glow discharge.

Growing community of inventors

Ono, Japan

Akio Tanaka