PROCESS FOR PRODUCING ELECTRODE FOR DISCHARGE SURFACE TREATMENT, AND ELECTRODE FOR DISCHARGE SURFACE TREATMENT

• Main Authors: SHIINO, MASAYOSHI, YOSHIZAWA, HIROKI, OCHIAI, HIROYUKI, WATANABE, MITSUTOSHI, OTERA, ISSEI
• Format: Patent
• Language: English; French; Japanese
• Published: 22.01.2009
• Subjects: CASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; WORKING METALLIC POWDER; WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL

This invention provides a process for producing an electrode for discharge surface treatment, comprising the step of filling an electrode material powder (11) into a mold (7), compressing the electrode material powder (11) to produce a porous green compact (27), setting the porous green compact (27) within a chamber (25) in a heat treating furnace apparatus (23), supplying an inert gas or a hydrogen gas into the chamber (25), and, while blowing an inert gas or a hydrogen gas heated by a heater (39) in the heat treating furnace apparatus (23) toward the green compact (27), and circulating the inert gas or the hydrogen gas by blowing within the chamber (25), whereby the green compact (27) is heated by convection heat of an inert gas, a hydrogen gas, or a mixed gas containing a hydrogen gas and an inert gas as a main component, which passes through the inside of the green compact (27), to sinter the electrode material of the green compact (27). Cette invention concerne un procédé pour produire une électrode pour un traitement de surface par décharge, le procédé comprenant les étapes consistant à introduire une poudre de matériau d'électrode (11) dans un moule (7), comprimer la poudre de matériau d'électrode (11) pour produire un comprimé cru poreux (27), installer le comprimé cru poreux (27) à l'intérieur d'une chambre (25) dans un appareil de four de traitement thermique (23), introduire un gaz inerte ou un gaz d'hydrogène dans la chambre (25), et, tout en soufflant un gaz inerte ou un gaz d'hydrogène chauffé par un dispositif de chauffage (39) dans l'appareil de four de traitement thermique (23) en direction du comprimé cru (27), faire circuler le gaz inerte ou le gaz d'hydrogène par soufflage à l'intérieur de la chambre (25), ce par quoi le comprimé cru (27) est chauffé par la chaleur de convection d'un gaz inerte, d'un gaz d'hydrogène, ou d'un gaz mélangé contenant un gaz d'hydrogène et un gaz inerte comme composant principal, qui passe à travers l'intérieur du comprimé cru (27), afin de fritter le matériau d'électrode du comprimé cru (27).