Method and apparatus for swaging screw blank extremities
阅读：130发布：2024-02-09
专利汇可以提供Method and apparatus for swaging screw blank extremities专利检索，专利查询，专利分析的服务。并且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 has a peripheral surface comprised of a pair of segments of conical surfaces each generated from axes which are offset or laterally displaced and one of these axes being coincident with the axis of 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.，下面是Method and apparatus for swaging screw blank extremities专利的具体信息内容。
1. The method of forming the entering portion of a cylindrical screw blank to include a substantially conical swaging portion and a pilot extending therefrom including the step of relatively and longitudinally moving a screw blank and a cylindrical bore of a die assembly in telescopic association, the diameter of said bore conforming substantially with the diameter of said screw blank, continuing said relative telescopic movement of said blank and die assembly so as to cause engagement of a first peripheral edge segment of the entering extremity of said blank with a first peripheral surface of a substantially conical tapered bore of said die assembly while a second, opposing, peripheral edge segment of the entering extremity of said blank is substantially unsupported within the die assembly to move and work the stock of the blank in a first direction lateral of the axis of the blank, continuing said telescopic movement to subsequently cause the second opposing peripheral edge segment of the blank to engage a second peripheral surface of said tapered bore disposed generally opposite the first peripheral surface to cause the second edge segment and first edge segment to be compressed inwardly toward each other, and continuing said relative movement so as to cause the advancing extremity of said blank to become telescopically associated with a pilot forming bore of said die assembly, said last mentioned bore being in axial alignment with and of smaller diameter than said cylindrical bore whereby the completed blank will present a cylindrical portion, a pilot portion in axial alignment therewith, and an intermediate substantially conical workpiece swaging section.
2. The method of forming the entering portion of a cylindrical screw blank as set forth in claim 1 wherein continued relative telescopic movement of the advancing extremity of said blank beyond said conical bore causes the entering extremity of said blank to enter said cylindrical pilot forming bore.
3. A die assembly for swaging the entering portion of a cylindrical screw blank including a first die section having an open-ended cylindrical bore for telescopically accommodating a complementary cylindrical screw blank, a second adjacently positioned die section having a bore of substantially conical shape for receiving and deforming the advancing extremity of a cylindrical blank from said first mentioned bore, the larger periphery of said substantially conical bore opening into the bore of said first die section, said substantially conical bore having a peripheral surface comprised of first and second portions of conical surfaces generated about noncoincident axes, one of said axes being coincident with the axis of the cylindrical bore in the first die section, the substantially conical bore having major and minor cross-sectional axes through the axial thereof, the first conical surface portion including segments disposed at a radial distance from the axis of the cylindrical bore which is less than the radial distance of the directly opposing segments on the second conical surface from said axis, said segments both lying in a plane perpendicular to said axis, pilot-forming bore means located beneath the substantially conical bore in axial alignment with the bore of the first die section and extending axially beyond the smaller diameter of said substantially conical bore, the region of merger of the cylindrical bore surfaces with the substantially conical surfaces including a first juncture line disposed at an angle to a plane extending perpendicularly to the axis of the cylindrical bore and thereby said first juncture line includes opposing peripheral segments which are essentially disposed axially from one another, the region of merger of the pilot forming bore surfaces with the substantIally conical surfaces including a second juncture line disposed at an angle to a plane extending perpendicularly to the axis of the cylindrical bore, said second juncture line also including peripheral segments which are essentially disposed axially from one another, whereby the telescopic association of a cylindrical screw blank with said die sections will result in the formation of a blank presenting an elongate cylindrical portion, a pilot portion in axial alignment therewith and an intermediate substantially conical portion which has been displaced laterally with respect to said elongate cylindrical portion and said pilot portion.
4. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3 wherein said second die section includes a die element disposed at an acute angle with respect to the longitudinal axes of said elongate cylindrical portion and said pilot forming portion.
5. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 4 wherein said second die section is wafer-like in shape.
6. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3, wherein a third die section is located beneath the substantially conical bore and in axial alignment with the bore of the first die section.
7. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 6, wherein the pilot forming bore means is located in the second die section.
8. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 6 wherein inner surfaces of said first and third die sections extend in parallelism with said inclined second die section and engage the opposite sides thereof.
9. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 6 wherein holder means encircles said first, second and third die sections.
10. A die device for swaging the entering portion of a cylindrical screw blank as set forth in claim 6 wherein the peripheries of said die sections define a cylinder, and annular holding means adjacently encircles said die sections.
11. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3 wherein the pilot-forming bore means is included in the second die section.
12. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3, wherein the larger extremity of said substantially conical bore at the juncture thereof with said cylindrical bore, in transverse section defines a plane intersecting the axis of said cylindrical bore at an acute angle.
13. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3, wherein the smaller extremity of said substantially conical bore at the juncture thereof with said pilot-forming bore, in transverse section defines a plane intersecting the axis of said pilot-forming bore at an acute angle.
14. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3, wherein the larger and smaller extremities of said substantially conical bore at the respective junctures thereof with said cylindrical and pilot-forming bores define planes intersecting the axis of said cylindrical and pilot-forming bores at an acute angle.
15. A die assembly for swaging the entering portion of a cylindrical screw blank as set forth in claim 3, wherein the larger extremity of said substantially conical bore has a minor diameter approximating the diameter of the cylindrical bore and a major diameter slightly larger than the diameter of said cylindrical bore, to enable the associated screw blank to enter the substantially conical bore without substantial abrupt resistance thereto.
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