| 摘要 |
PURPOSE:To provide a titled tool which is inexpensive and is usable under high forging pressure by welding a sintered hard alloy and a steel by a high energy beam in the annealed state of the steel material then subjecting the welded material to hardening and tempering thereby distributing uniformly the hardness of the steel material. CONSTITUTION:A cold, warm and hot forged tool is constituted of a steel and a sintered hard alloy and an annealed material is used for the steel. The sintered hard alloy to be used in direct contact with the material to be worked is pressed thereto directly or via a metallic filler and a high energy beam is irradiated to the contact part to weld both materials. The entire part of the joined tool after welding is subjected to a heat treatment such as hardening, tempering, etc. to distribute uniformly the hardness of the steel. The sintered hard alloy consists of WC having 1-20mu average drain size and 15-40wt% bond metal of 1 or >=2 kinds among Co, Ni, Cr and Fe. |
