Method and apparatus for hole coldworking

Details Method and apparatus for hole coldworking Method and apparatus for hole coldworking

1984-11-23

1986-04-22

Larson, Lowell A.

Metal deforming

By relatively receding work-engaging tool-faces

Embodying three or more tools

7245316, 7245318, 29252, B21D 4102

Patent

active

045833885

ABSTRACT:
A method and apparatus for coldworking of holes using a split mandrel. The apparatus uses a mandrel having a larger diameter end and radially directed slots to permit contraction of its outer diameter as it is fitted within a hole. The mandrel partially contains a pilot in its "at rest" state. After placing the mandrel and pilot within a hole to be coldworked, the pilot is pushed fully into the mandrel solidifying the mandrel. The pilot and mandrel are then withdrawn through the hole, thereby coldworking the hole. An air logic circuit accomplishes the pushing of the pilot within the mandrel and retraction of the pilot and mandrel.

REFERENCES:
patent: 2275451 (1942-03-01), Maxwell
patent: 2319216 (1943-05-01), Dewald
patent: 2357123 (1944-08-01), Maxwell
patent: 2974712 (1961-03-01), Frye et al.
patent: 3470724 (1969-10-01), Gregg
patent: 4253324 (1981-03-01), Nugent

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