Theoretically it shouldn t be complicated.
Stamped sheet metal tolerances.
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To the uninitiated sheet metal and plate bending looks simple enough but the truth is that it s often the most complicated process on many metal fabrication shop floors.
Below are dimensions and tolerances typical of stamped metal components.
Commonly used flatness tolerances for metal stamping laser and turret are shown below.
By coining or placing a small dent in the outside radius of the bend you can break up and often reverse the tensional stress that was created during deformation see figure 3 this is because the coining action pushes metal outward and changes the stress from tension to compression.
Fabrication tolerances for dimensional variance in sheet metal and machined parts overview protocase takes great care to manufacture your electronic enclosures parts and components as accurately as possible.
If the material required to produce a metal stamping order is much less.
Flatness tolerances for metal stamping.
Dimensional tolerances of metal parts manufactured by stamping should be carefully considered.
Precision stampings or precision stamped features on stamped parts are possible without post machining or additional manufacturing steps.
In a sheet metal design specifying hole sizes locations and their alignment is critical.
This method works well for the bowing up problem shown in figure 1.
But tolerances still must take material variations into account.
Stippling the outside bend radius.
Cutting clearances between the punch and die are closely defined and specified in the die design stage based on the requirement of the part.
Fabricators are accustomed to idiots specifying sheet metal and weldment tolerances at pm 005.
Rolling mills work from master coils and so usually have minimum order quantities somewhere in the truckload range.
Photo courtesy of mate precision tooling.
Of course exceptions apply.
Dimensioning standard for sheet metal part diegolgraves mechanical 21 jun 16 19 16.
These sizes are usually readily available as stock items and are generally the best choice when cost and delivery are a major factor.
A normal metal stamping process creates a die cut is to drive a sharpened tool steel punch through the sheet or strip material into a die cavity where the slug or scrap is ejected.
The tolerances shown are well suited to the progressive stamping process and thus ensure quality and cost effective parts.
