BOOK_CONTENT
From Handbook of Machining and Metalworking Calculations

OVERVIEW

The branch of metalworking known as sheet metal comprises a large and important element. Sheet metal parts are used in countless commercial and military products. Sheet metal parts are found on almost every product produced by the metalworking industries throughout the world.

Sheet metal gauges run from under 0.001 in to 0.500 in. Hot-rolled steel products can run from in thick to no. 18 gauge (0.0478 in) and still be considered sheet. Cold-rolled steel sheets are generally available from stock in sizes from 10 gauge (0.1345 in) down to 28 gauge (0.0148 in). Other sheet thicknesses are available as special-order mill-run products when the order is large enough. Large manufacturers who use vast tonnages of steel products, such as the automobile makers, switch-gear producers, and other sheet metal fabricators, may order their steel to their own specifications (composition, gauges, and physical properties).

The steel sheets are supplied in flat form or rolled into coils. Flat-form sheets are made to specific standard sizes unless ordered to special nonstandard dimensions.

The following sections show the methods used to calculate flat patterns for brake-bent or die-formed sheet metal parts. The later sections describe the geometry and instructions for laying out sheet metal developments and transitions. Also included are calculations for punching requirements of sheet metal parts and tooling requirements for punching and bending sheet metals.

Tables of sheet metal gauges and recommended bend radii and shear strengths for different metals and alloys are shown also.

The designer and tool engineer should...

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Products & Services
Rolled Metals and Drawn Metals
Rolled metals and drawn metals are metals and alloys that are rolled into sheets, plates, strips, foils, bars, rods, or other shapes. Rolling and drawing are the two different processes used to create these shapes.
Plate Forming Services
Plate forming services cut, roll, form, and weld metal plates typically greater than 3/16".
Roll Forming Machines
Roll forming machines bend metal sheet into channels and other cross-sectional shapes. They use paired rollers called roll stations to form metal parts with long lengths, often in large quantities. Roll forming equipment that is used to shape steel can fabricate parts with greater strength-to-weight ratios than can be obtained via alternative methods.
Metal Sheet
Metal sheet is metal or alloy stock supplied or available in the form of sheet or foil. It has a thickness between 0.006" and 0.250", and a width of 24" (609.6 mm) or more.

Topics of Interest

7.1 INVOLUTE FUNCTION CALCULATIONS Involute functions are used in some of the equations required to perform involute gear design. These functional values of the involute curve are easily calculated...

Overview The branch of metalworking known as sheet metal comprises a large and important element. Sheet metal parts are used in countless commercial and military products. Sheet metal parts are found...

OVERVIEW The branch of metalworking known as sheet metal represents a large and important element. Sheet-metal parts are used in countless commercial and military products and are found on almost...

This appendix offers the reader many reference to subjects related to the sheet metal forming processes, die design, and the die making trade that are not easily found on one place. A3.1 SHEET METAL...

Don S.Wolford Consulting Engineer Middletown, Ohio Wei-Wen Yu University of Missouri-Rolla Rolla, Missouri Overview The introduction of sheet rolling mills in England in 1784 by Henry Cort led to...