Means for determining maximum ironing reduction

Details Means for determining maximum ironing reduction Means for determining maximum ironing reduction

1986-03-14

1988-03-15

Larson, Lowell A.

Measuring and testing

Ductility or brittleness

73835, 73 10, G01N 328

Patent

active

047304839

ABSTRACT:
Apparatus and method for determining the fracture resistance of thin wall hollow articles when ironed, the method including the step of providing a drawing die and punch or a mandrel having a portion thereof tapered in a continuous, linear manner. The taper is such that it provides a continuous decrease in punch-to-die clearance when the two are moved together, and thus a continuous range of ironing reductions along the side wall of an article located between the punch and die. The taper of the punch begins adjacent the forward end thereof and is sized to effect conventional thinning of the side wall of the article at the onset of ironing. The final diameter of the taper of the punch, however, is such that fracturing of the side wall is assured in the ironing process.

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Metalworking Lubricants by E. L. H. Bastian, McGraw-Hill Book Co., Inc., (1951), pp. 323-334.
The Making, Shaping and Treating of Steel by United States Steel; .COPYRGT. 1957, 7th ed., pp. 923 and 924.

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