Metal tools and implements – making – Blank or process – Die
Patent
1994-05-09
1996-08-13
Jones, Eugenia
Metal tools and implements, making
Blank or process
Die
2940219, 72376, 216 52, 216100, 83651, B21K 520
Patent
active
055445497
ABSTRACT:
A process for producing a steel punching sheet that has the same ideal dimension over the entire length of the punching edge has the following steps: producing webs carrying punching edges on a steel starting sheet; processing the punching edges, wherein the distance between the punching edges and the back of the sheet is adjusted to a positive tolerance with respect to an ideal dimension; and grinding the back of the sheet to remove material in excess of the ideal dimension to within a tolerance of not more than 0.02 mm, more particularly a tolerance of not more than 0.005 mm. Advantageously, the process includes the following additional steps: adjusting the distance between the punching edges and the back of the sheet to a negative tolerance, with respect to an ideal dimension, and applying material to the back of the sheet to make-up for the negative tolerance up to a positive tolerance of not more than 0.02 mm, more particularly, a tolerance of not more than 0.005 mm; and adjusting the distance between the back of the punching sheet and the punching edge by guiding a non-cutting tool along the side walls; and pressing the non-cutting tool on both side walls directly in the region of the punching edge.
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