| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for improving insulation resistance of a vacuum heating furnace, which can shorten the time required for a burnout process to improve processing efficiency of vacuum carburization. <P>SOLUTION: The method for improving insulation resistance of a vacuum heating furnace includes: a vacuum heating step of reducing the inner pressure of a heating chamber 3 of the vacuum heating furnace 1 having a graphite heater 5 in the heating chamber 3 to a predetermined vacuum degree and also heating the inside of the heating chamber 3 with the graphite heater 5 to a predetermined temperature; and a burnout step of introducing dry air into the heating chamber 3 after the vacuum heating step. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
