Patent DE-102007032621-A1 (DE)
Title: Metallic tool insert useful in plastic injection molding machine, comprises a shaping part with form surface, which is partially prefabricated out of steel, and a base part that is equipped with two cool channels
Inventor: HERZOG FRANK
IPC: B22F7/08
Filed: 2007-07-11
Abstract: The metallic tool insert useful in plastic injection molding machine, comprises a shaping part (2) with a form surface (3), and a base part (4) that is equipped with two cool channels. The shaping part is partially prefabricated out of steel and the side of the shaping part turned from the form surface serves as plane connection surface (6) for the construction of base part by a metal powder melting- or metal powder sintering process. The cool channel structure (5) of the base part is arranged areawisely running in an area adjacent to the shaping part. The metallic tool insert useful in plastic injection molding machine, comprises a shaping part (2) with a form surface (3), and a base part (4) that is equipped with two cool channels. The shaping part is partially prefabricated out of steel and the side of the shaping part turned from the form surface serves as plane connection surface (6) for the construction of base part by a metal powder melting- or metal powder sintering process. The cool channel structure (5) of the base part is arranged areawisely running in an area adjacent to the shaping part. The shaping part has a structure that is arranged at its form surface before the sintering or melting of the base part. Before or after sintering of the base part, the form surface is surface treated. The shaping part has a smaller or same height as the base part. The connection surface of the shaping part has a structure that corresponds with the surface of the base part to the shaping part. In the connection surface, a structure is subjected through a forming or separating process that forms a component of the cool structure. A part of the cross section area of the cool channel is incorporated to part in the connection surface of the shaping part and the remaining part of the cross section surface is subjected through a generative procedure. The cool channel is arranged dependent upon the structure of the form surface. The cool channel is arranged areawisely equidistant to the form surface of the shaping part. The cool channels have same length and/or same resistance at the cooling fluid within the channel. The cross-section of the cool channel has different geometry over its length. The cool channel has a network structure that is cast about half in the connection surface of the shaping part and is brought separately. The plain, in which the connection surface lies, penetrates in about half of an area of the cool channels. A turbulence element is integrated into the cool channels. The prefabricated shaping part consists of a vacuum melted, powder metallurgically produced and/or high heat conductive steel. A coating is intended between the base part and the shaping part, which consists of ceramic. The forming surface is formed as negative form. The base part has a gripping element to fix the tool insert temporarily in a tool. The gripping element is arranged as core hole or reception bore. The external contour of the shaping part and the base part conclusively connects to one another over an offset. The base part and the shaping part have a casting pin reception opening. The shaping part has high density than the base part. The base part consists of copper and/or bronze components. The shaping part is receivable in a support fixture, which is arranged on a carrier and/or a plat form of a laser melting or laser sintering plant. The shaping part, the support fixture and/or the carrier is equipped with a reference surface of the reference bore that enables a defined insertion in a processing machine. The support fixture and/or the carrier is detachably connected over a zero-point tension system with the platform. The support fixture has a plane surface with a recess in which the shaping part is insertable. The forming surface of the forming part corresponds with the form of the recess of the support fixture. An independent claim is included for a procedure for the production of tool insert insertable in plastic injection molding machine.