Method for the manufacturing of a plate

Method for the manufacturing of a plate (2) of metal or of a ceramic material, the plate comprising one or more fields (3) which occupy the major part of the surface of the plate and which on at least one side of the plate is high relief patterned such that the plate on said at least one side within the area of said field or fields has/have reliefs with high projections and deep valleys (9) or recesses (8) alternatingly, and between the sides a thin web (10), said high relief patterned field or fields being at least partly bordered by broad edge portions (4) which have a thickness larger than the mean thickness of the plate within the region of said high relief patterned field or fields, the method comprising:

• manufacturing, in at least one preliminary step, an intermediate product (1), the intermediate product comprising a first portion (11) which shall form said high relief patterned field(s), which however is(are) not yet high relief patterned but contain(s) a quantity of material essentially corresponding to the quantity of material existing within said field(s) of the finished plate, and second portions (12) which shall form said edge portions and which contain substantially the quantity of material that shall exist in those portions of the finished plate,
• placing the intermediate product between at least two engraved moulding tool parts (30, 31), which are movable relative to one another, at least one of said moulding tool parts being high relief engraved and at least one being a punch (31), said tool parts, when they are maximally brought together, forming between them and/or together with at least one or more tool parts, a mould cavity corresponding to the final shape of the finished plate within the regions of said high relief patterned field(s) and at least near the final shape of said edge portions, and
• establishing the high relief pattern within the region/regions of said field(s) by striking the engraved tool parts against one another, at least said punch being stricken against said intermediate product wherein the material within the regions of said at least one first portion is caused to flow and fill the mould cavity to establish said high relief pattern essentially without transportation of material between said first and second portions,
• wherein in connection with the manufacturing of the high relief pattern, an impact member is stricken against at least said at least one punch, which transfers impact energy to the intermediate product (1).