Abstract The present invention relates generally to improvements in methods and mechanisms for swaging the entering portion of a screw blank, and more specifically to novel methods and mechanisms for producing screw blanks having laterally offset, substantially conical entering or work swaging portions and a pilot extending therefrom. The invention as disclosed herein contemplates the use of a novel die arrangement wherein a first die section is provided with an openended cylindrical bore for telescopically accommodating a screw blank of corresponding size. An adjacently positioned second die section having a substantially conical bore is adapted to receive the entering extremity of a screw blank from the first die section. The substantially conical bore is offset or displaced laterally with respect to the bore in the first die section. This second die section is positioned intermediate the first die section and a third die section having a pilot-forming bore the central axis of which is coincident with the bore of the first die section.
A method of forming a die section to be used in forming the entering portion of a cylindrical screw blank including the steps of providing a die section with a central bore, forming a conical recess in the die section coaxial with the central bore, deforming the conical recess by engaging the recess with a forming tool positioned along an axis laterally displaced from the central axis and to a depth greater than the conical recess.
Claim 2
Independent Claim
76 words
A method of forming a die section to be used in forming the entering portion of a cylindrical screw blank including the steps of providing a die section with a central bore, forming a conical recess in the die section coaxial with the central bore, deforming the conical recess by engaging the recess with a forming tool positioned along an axis laterally displaced from the central axis and to a depth greater than the conical recess.
Claim 3
Dependent Claim
27 words
A method of forming a die section in accordance with claim 1 wherein the initial conical recess and subsequent deformation therein are formed by the same tool.
Claim 4
Dependent Claim
32 words
A method of forming a die section in accordance with claim 1 wherein the conical recess and subsequent deformation therein are accomplished by swaging the central bore with a conical swaging tool.