Method and apparatus for producing a high fin density extruded heat dissipator
First Claim
Patent Images
1. The method of manufacturing an integral heat dissipator having high density fins extending from a surface of a base comprising:
- extruding the integral heat dissipator with a partial cylindrical base having the fins extending substantially radially from the outer cylindrical surface of the base;
placing the said extruded heat dissipator about a mandrel;
securing one end of the base to the mandrel;
securing the other end of the base to a means for applying a tensile stress to the base in a plane tangent to the mandrel at a line of tangency;
braking rotation of the mandrel while applying the tensile stress to rotate the mandrel thereby gradually straightening the dissipator;
after the base has been substantially straightened stopping further rotation of the mandrel; and
increasing said tensile stress to a value slightly above the yield point to further strain straighten the base of the heat dissipator.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of manufacturing a high fin density heat dissipator is disclosed in which the dissipator is extruded through a die in a partially cylindrical shape with the elongated fins arranged on the base and extending radially therefrom. The extruded dissipator is straightened under tensile and bumping forces in a manner such that the base assumes a planar shape and the fins become substantially parallel to each other. Apparatus for straightening the extruded dissipator and a die for extruding the same are illustrated and described.
-
Citations
6 Claims
-
1. The method of manufacturing an integral heat dissipator having high density fins extending from a surface of a base comprising:
-
extruding the integral heat dissipator with a partial cylindrical base having the fins extending substantially radially from the outer cylindrical surface of the base; placing the said extruded heat dissipator about a mandrel; securing one end of the base to the mandrel; securing the other end of the base to a means for applying a tensile stress to the base in a plane tangent to the mandrel at a line of tangency; braking rotation of the mandrel while applying the tensile stress to rotate the mandrel thereby gradually straightening the dissipator; after the base has been substantially straightened stopping further rotation of the mandrel; and increasing said tensile stress to a value slightly above the yield point to further strain straighten the base of the heat dissipator. - View Dependent Claims (2, 3, 4)
-
-
5. Apparatus for straightening an extruded heat dissipator having a partially cylindrically shaped base with fins extending radially from the outer surface of the base, comprising:
-
a mandrel having means to grip one end of the base of the heat dissipator; means for gripping the other end of the base and for applying a pulling force to the base in a plane tangent to the mandrel at a line of tangency, thereby applying a bending moment to the base at the line of tangency; a brake arranged to prevent rotation of the mandrel until stresses resulting from said bending moment exceed the yield strength of the base at the line of tangency; means to stop rotation of the mandrel after the base has been substantially straightened; and means to further stretch the base by increasing the pulling force slightly above the yield point of the base to further strain straighten the base of the heat dissipator. - View Dependent Claims (6)
-
Specification