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Insertable Stud for Die Castings

IP.com Disclosure Number: IPCOM000073838D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Klaus, GF: AUTHOR [+2]

Abstract

A stud 2 to be secured to a die cast part 3 is formed with a curved leading surface 5, that may for instance be in the form of the segment of a sphere. Adjoining surface 5 is a cylindrical surface 6. Cylindrical surface 7 is of greater diameter than surface 6 and is axially separated by a reduced radius surface that forms an annular groove 9. A radial surface 10 is at the lower end of the body 11 of the stud 2.

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Insertable Stud for Die Castings

A stud 2 to be secured to a die cast part 3 is formed with a curved leading surface 5, that may for instance be in the form of the segment of a sphere. Adjoining surface 5 is a cylindrical surface 6. Cylindrical surface 7 is of greater diameter than surface 6 and is axially separated by a reduced radius surface that forms an annular groove 9. A radial surface 10 is at the lower end of the body 11 of the stud 2.

Stud 2 is pressed into a cored opening 13 in die cast part 3. The cored opening 13 is tapered to provide the necessary draft for the casting operation and presents an opening at surface 14 through which the leading portion of the stud, formed by surfaces 5 and 6, is received. The diameter of cored opening 13 at surface 14 is substantially equivalent to the diameter of surface 6. The opening must be large enough to accept the stud and small enough to cause surface 5 and 6 to engage the cored opening during a significant portion of the insertion stroke. Upon entering opening 13 the ball formed by surfaces 5 and 6 sizes and burnishes the cored opening. The ball tends to build up material as it advances, thus assuring full contact over a larger area of the holding configuration. The leading edge of cylindrical surface 7 engages the die cast part surface 14 and cuts through, bringing the seating diameter of radial surface 10 into contact with an undisturbed portion of surface 14. Also material driven ahead of the leading edge of...