Apparatus and method for manufacturing sprocket segment

Details Apparatus and method for manufacturing sprocket segment Apparatus and method for manufacturing sprocket segment

2009-06-26

2010-11-16

Tolan, Edward (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

C072S353200

Reexamination Certificate

active

07832247

ABSTRACT:
Disclosed therein are an apparatus and method for manufacturing a sprocket segment, which can manufacture the sprocket segment through a simplified process including hot precision forging, through hardening and painting, thereby reducing manufacturing period and cost and securing competitive power. The sprocket segment manufacturing method includes: a primary hot forging process of putting a heated billet in a booster die (10) mounted on a forging press to perform a distribution of volume; a secondary hot forging process of putting the hot forged material (M) in a blocker die (11) to form a rib face (4); a tertiary hot forging process of putting the secondarily hot forged material (M) in a finisher die (12) to keep right angles and planes of a toothed face (6) and the rib face (4); and a process of putting the tertiarily hot forged material (M) in a product guide die (22) of a trimming-piercing-coining die (13) to eliminate a flash and form bolt holes (7) simultaneously.

REFERENCES:
patent: 3478560 (1969-11-01), O'Brien
patent: 4207762 (1980-06-01), Kelly, Jr.
patent: 4420962 (1983-12-01), Peterson
patent: 4463590 (1984-08-01), Theobald
patent: 4517819 (1985-05-01), Sandroni

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