COMPOUND DIE MATERIAL FOR PRESS FORMING, ITS PRODUCTION, AND PRESS FORMING DIE CONSISTING OF THE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a block for die construction, where a sintered compact of cemented carbide and a steel material are metallurgically integrally joined to each other. SOLUTION: The block is a block 1 of die material in which a tungsten- carbide-base cemented carbide and a steel material 3 are integrally joined to each other. Moreover, this block is composed of a sintered compact of tungsten- carbide-base cemented carbide at least in three layers where the content of a binding phase component is decreased in a surface layer part 4 and increased stepwise from the surface layer part with the approach to an inner layer part 6, and further, the steel material 3 is joined to the inner layer part by diffusion reaction. Plural blocks mentioned above are arranged to constitute a die surface and form a press forming die. The fixing of the die to a backing plate by means of welding or bolting can easily be performed via the steel material, and dies of various shapes can be produced by the arrangement of the blocks. The surface layer part of the sintered compact of cemented carbide, to be the press working surface of a die, has excellent wear resistance, and a die surface having durability can be formed.