| 摘要 |
<p>PURPOSE:To subject quickly and stably the blade parts of a press die to quench hardening to high hardness by positioning the blade parts to face each other at a small spece in an overlapped state and passing high frequency current thereto. CONSTITUTION:Members 1, 2 constituting the blade parts of upper and lower dies in a press die are positioned to face each other at 2mm. space and are disposed in such a way that the blade parts facing each other overlap at 5mm.. Both members are connected on one side electrically by an electrode plate 3 having good current-conductive and wear-resistant electrodes 4, 5 and are connected on the other side to a high frequency power source 11 by lead plates 6, 7 having wear resistant electrodes 8, 9. High frequency current of 100kHz frequency is conducted at 10.5 ampere for 5sec to said electrodes from a power source 11 in this stage. A surface hardened layer is easily formed by quench hardening to both blade parts 1, 2 of the press die.</p> |
