Method of manufacturing a hollow shaft with internal swellings o

Details Method of manufacturing a hollow shaft with internal swellings o Method of manufacturing a hollow shaft with internal swellings o

1990-01-29

1991-07-02

Heinrich, Sam

Metal fusion bonding

Process

Using dynamic frictional energy

228114, B23K 2012, B23K10104

Patent

active

050279963

ABSTRACT:
A method of manufacturing a hollow shaft having internal swellings of revolution is disclosed. Hollow shaft sections, each having at least one internal swelling of revolution, are consecutively formed in a substantially continuous cold extrusion process using a single punch 7. Tubular blank 1a is extruded through narrowed orifice 14 of die 8. Tip 10 of punch 7 is inserted into axial passage 11 of blank 1a and shoulder 13 of punch 7 engages a rear end of blank 1a to push blank 1a partially through narrowed orifice 14 and thereby compress the front end of blank 1a between tip 10 and narrowed orifice 14. Punch 7 is then removed from die 8 and another tubular blank 12 is introduced in die 8 with its front end in abutment with the rear end of deformed blank 1b. With tip 10 to punch 7 partially removed from passage 11 of deformed blank 1b, shoulder 13 of punch 7 engages the rear end of blank 12 and pushes blank 12 through die 8 thus causing the formation of an internal swelling (2, 2') in the portion of blank 1b situated in front of tip 10. Force is continued on blank 12 until blank 1c is completely removed from die 8 leaving blank 12 in the position that original blank 1a was in at the beginning of the operation.

REFERENCES:
patent: 4677722 (1987-07-01), Emmer
patent: 4712941 (1987-12-01), Emmer

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