Method for producing a cooling device

A method (1) for producing a cooling apparatus (10) comprising at least one hollow body (30) made of a first material being thermally conductive and a base body (20) made of a second material being thermally conductive, the method comprising

• coating an outside of the at least one hollow body (30) with a third material to provide a surface coating (36) of the third material,
• filling an inside of the at least one hollow body with the third material to provide a filled at least one hollow body (30) with a filling (5) of the third material, which has a lower melting temperature than the first and second materials,
• subsequently cooling the filling (5),
• subsequently putting the filled at least one hollow body (30) into a die casting mold,
• subsequently introducing the second material as a die casting at a first temperature into the die casting mold, wherein the second material flows around the at least one hollow body (30) at least in part, and wherein the die casting melts away the third material of the surface coating (36) and melts onto the first material of the at least one hollow body (30), so that a material bond between the die casting of the second material, forming the base body (20), and the first material of the at least one hollow body (30) is obtained at least in regions, wherein the die casting of the second material sets and becomes solid during a setting phase, wherein during the setting phase the die casting of the second material heats the filling (5) made of the third material inside the at least one hollow body (30) until the filling (5) reaches the melting temperature of the third material and becomes molten third material, and
• removing the molten third material from the at least one hollow body (30) under pressure.