| 摘要 |
<p>PURPOSE:To reduce the production of a hardening strain in a member, to improve the dimensional accuracy after hardening, and to make the surface hardening uniform by supplying electric current to a high frequency heating means in a cooling liq. to heat the member having a suitable thickness. CONSTITUTION:A high frequency heating means 17 is placed along a surface of a member 11 to be hardened. The member 11 has a suitable thickness. A cooling liq. is fed to the surface of the member 11 to be hardened and the opposite surface from cooling liq. feeding pipes 15, 24. While supplying electric current to the means 17 in the cooling liq., the member 11 is moved properly and relatively to carry out induction hardening. By this method the production of a hardening strain is reduced, the dimensional accuracy after the hardening is improved, and the surface hardening is made uniform.</p> |
