Split-die press tool

A split-die press tool for forming, by compressing a powder, a green body for a double-sided and double positive cutting insert for metal cutting, wherein the green body has a top edge, a bottom edge and a side surface connecting the top edge and the bottom edge, wherein the top edge is associated with an adjacent inclined upper surface in the side surface and the bottom edge is associated with an adjacent inclined lower surface in the side surface, which both respective inclined surfaces have a positive nominal angle α, the tool comprising

• a die having at least two die sections, wherein each die section is movably arranged along a horizontal axis to a respective proximal pressing position and to several respective distal positions, and wherein, when each die section is in the respective pressing position, the die sections form therebetween a punch tunnel extending along a vertical pressing axis;
• an upper punch unit and a lower punch unit, both the upper and lower punch unit having a front end with a circumferential front end periphery, and both upper and lower punch units being arranged in the punch tunnel with the respective front ends facing each other, and wherein both the upper and lower punch unit are movably arranged in the punch tunnel along the pressing axis to a respective proximal pressing position and to several respective distal positions, wherein, when the die sections, the lower punch unit and the upper punch unit are in their respective pressing positions, the front end periphery of the lower punch unit is at a first pressing level, and a compression space corresponding to a compressed state of the green body to be formed is formed in the punch tunnel, and when the lower punch unit is in a distal position in a form of a decompression position, the front end periphery of the lower punch unit is at a first expansion level corresponding to a maximal downward vertical decompression expansion of the green body to be formed, and wherein the punch tunnel includes a first side surface portion located on at least one of the die sections, wherein the first side surface portion has a vertical extension downward from the first pressing level to the first expansion level, and wherein the first side surface portion, as seen in a vertical cross section of the punch tunnel, is inclined downward and away from the pressing axis by an angle β of at least the angle α of an adjacent inclined lower surface of the green body to be formed, and the punch tunnel includes a second side surface portion located on the at least one of the die sections, which second side surface portion is vertically aligned with the first side surface portion and has a vertical extension downward from the first expansion level to a first restraining level, and at which first restraining level a horizontal distance to the adjacent front end periphery of the lower punch unit is less than at the first expansion level.