Abstract: The present application relates to a method of manufacturing a heat sink from a plurality of extruded lamellas, each lamella including a base portion having a top surface, a bottom surface, and two side surfaces, each lamella further including a fin portion extending from the top surface of the base portion, wherein the base portion is wider than the fin portion. The method includes aligning the base portions of the plurality of lamellas with the fin portion of each lamella extending in the same direction and the side surfaces of adjacent base portions facing each other; pressing the base portions of adjacent lamellas into contact with each other by applying a force to the side surface of at least one of the base portions; and welding the bottom surfaces of adjacent base portions together. A heat sink and a lamella for use in manufacturing a heat sink are also disclosed.

Abstract: The present application relates to a method of manufacturing a heat sink from a plurality of extruded lamellas, each lamella including a base portion having a top surface, a bottom surface, and two side surfaces, each lamella further including a fin portion extending from the top surface of the base portion, wherein the base portion is wider than the fin portion. The method includes aligning the base portions of the plurality of lamellas with the fin portion of each lamella extending in the same direction and the side surfaces of adjacent base portions facing each other; pressing the base portions of adjacent lamellas into contact with each other by applying a force to the side surface of at least one of the base portions; and welding the bottom surfaces of adjacent base portions together. A heat sink and a lamella for use in manufacturing a heat sink are also disclosed.

Abstract: The hydroforming tool of the present invention comprises a pair of upper and lower tool inserts having open axial ends and defining an elongated cavity there between when the tool inserts are forced together. The upper and/or lower tool inserts are composed of segments that are attached to the upper and a lower base plates, by bolts. Retaining elements, such as pins, are introduced into holes in the base plates and continues into cavities formed in the segmented inserts. This prevents the insert segments from moving during the forming operation. In this way the use of base blocks may be omitted. Sometimes the friction force acting between the base plate and segmented inserts, caused by the high pressure applied to the tool surfaces, is sufficient to prevent the separation of the segments, whereby the segments are kept in place without the use of retaining elements.

Abstract: The hydroforming tool of the present invention comprises a pair of upper and lower tool inserts (B) having open axial ends and defining an elongated cavity there between when said tool inserts are forced together. The upper and/or lower tool inserts are composed of segments that are attached to the upper and a lower base plates, (A), by bolts. Retaining elements, such as pins, are introduced into holes in the base plates and continues into cavities (D) formed in the segmented inserts. This prevents the insert segments from moving during the forming operation. In this way the use of base blocks may be omitted. Sometimes the friction force acting between the base plate and segmented inserts, caused by the high pressure applied to the tool surfaces, is sufficient to prevent the separation of the segments, whereby the segments are kept in place without the use of retaining elements.