Method and apparatus for hole coldworking

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

1983-09-30

1987-05-19

Larson, Lowell A.

Metal deforming

By relatively receding work-engaging tool-faces

Embodying three or more tools

7245316, 7245318, 29252, B21D 4102

Patent

active

046657320

ABSTRACT:
A method and apparatus for coldworking of holes using a split mandrel. The apparatus uses a mandrel having radially directed slots to permit contraction of its outer diameter as it is fitted within a hole. The mandrel contains a pilot inside the mandrel. After placing the mandrel and pilot within a hole to be coldworked, the pilot is pushed into the mandrel expanding the mandrel. The pilot and mandrel are then withdrawn through the hole, thereby coldworking the hole.

REFERENCES:
patent: 1964023 (1934-06-01), Armstrong
patent: 2275451 (1942-03-01), Maxwell
patent: 2319216 (1943-05-01), DeWald
patent: 2357123 (1944-08-01), Maxwell
patent: 2697872 (1954-12-01), Armstrong
patent: 2974712 (1961-03-01), Frye et al.
patent: 3367011 (1968-02-01), Sipher
patent: 3470724 (1969-10-01), Gregg
patent: 4077102 (1978-03-01), Smith
patent: 4213239 (1980-07-01), Filer
patent: 4253324 (1981-03-01), Nugent

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