Method for making a tool for forming a material and tool obtainable by said method

A method of producing a tool intended for the forming of a material by hot drawing or injection molding, for the purpose of making an object of defined shape therefrom, said tool having a forming face of shape complementary to at least one portion of said defined shape, said method including designing a contour of the tool to be produced, which has a projected forming face having said complementary shape, and devising, on the inside of said projected contour, according to said complementary shape, a projected circuit for the circulation of a heat-transfer fluid inside the tool to be produced, said projected circuit having a plurality of projected ducts at least one of which constitutes a projected manifold and at least one other of which constitutes a projected branch off the projected manifold and running alongside the projected forming face,

• characterized:
• in that the initial step a) is implemented by placing at least a projected first duct over as simple as possible an average surface, the average surface of the or each projected first duct intersecting the projected forming face, thereby defining sections of the projected forming face, and of at least one projected second duct, thereby defining sections of the or each projected second duct;
• and
• in that the method then comprises the succession of steps consisting in;
• b:
• producing tool slices, each of which is bounded in particular by at least one mating face, at least certain mating faces at least approximately reproducing a respective average surface, namely, acrosswise, by two mating faces at least approximately reproducing, respectively, each of the two respective average surfaces, and by at least one blank for a useful face reproducing a respective projected forming face section adjacent said respective average surface, namely, in a spanning manner, a projected forming face section bounded by said respective two average surfaces, and includes, on the one hand, within its thickness, a passage reproducing the respective section of the or each projected second duct and emerging in the or each mating face and, on the other hand, in the or each mating face a groove connected as a branch off said passage and at least approximately reproducing one half of the respective projected first duct,
• c:
• juxtaposing the tool slices via their mating faces and mutually fastening them in a relative position in which the useful faces or said blanks, the passages and the grooves are complementary from one slice to the other slice in order to constitute, respectively, the forming face or a forming face blank, the or each second duct and the or each first duct, and, where appropriate, machining the forming face blank in order to produce the forming face.