Abstract: A surface treating is performed by an electric discharge. The electric discharge is generated by applying a voltage between an electrode and a metal workpiece. The electrode is a solid or green compact electrode or the like which is made of a reforming material. The workpiece may be an end mill or the like. Then, a coating layer is formed on a surface of the metal workpiece. Thereafter, a nitriding treatment is performed on the coating layer in a nitriding vessel or the like. Thus, a hard coating layer of better quality is formed on the surface of the workpiece whether a material of the workpiece is steel or hard metal.
Type:
Grant
Filed:
June 2, 1998
Date of Patent:
July 11, 2000
Assignees:
Japan Science and Technology Corporation, Nagao Saito, Naotake Mohri, Mitsubishi Denki Kabushiki Kaisha
Abstract: A surface treating method uses an electric discharge machining to form a coating layer having strong adhesion and excellent characteristics on a metal surface such as a hard metal. A discharge electrode is formed by powders containing metal hydride. Electric discharge is generated in a working fluid containing carbon between the discharge electrode and a workpiece. Thus, a coating layer of the metal hydride is formed on a surface of the workpiece.
Type:
Grant
Filed:
January 15, 1997
Date of Patent:
January 12, 1999
Assignees:
Japan Science and Technology Corporation, Nagao Saito, Naotake Mouri, Mitsubishi Denki Kabushiki Kaisha
Abstract: A surface treating apparatus rotates a rotating tool and moves a surface treating electrode relative to the tool via a rotating shaft driver and a Z-axis driver. A power source applies voltage to generate an electric discharge between the tool and the electrode, thereby forming a reforming layer on a peripheral flank and a rake face of the tool.
Type:
Grant
Filed:
February 6, 1997
Date of Patent:
September 8, 1998
Assignees:
Japan Science and Technology Corporation, Mitsubishi Denki Kabushiki Kaisha, Nagao Saito, Naotoke Mouri
Abstract: An ultrasonic machining method comprises the steps of causing a machining solution to readily produce a gas in the machining solution, supplying the machining solution around a workpiece to be machined, and producing an ultrasonic vibration to carry out an ultrasonic machining operation, wherein the gas is produced during the machining operation so that a machined surface of the workpiece is prevented from being degraded by the occurrence of cavitation. An ultrasonic machining apparatus comprise a heater for heating the machining solution or a DC power source for electrolyzing the machining solution.
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