What's the correct term to apply a control to a volumetric region of material? 1

[flash3780]

I'm faced with adding a specific material property control to a region of a forging.

When working with machined parts, it's common to apply controls to "AREA"s (e.g. a length along a diameter requires a tighter tolerance or some special processing).

However, I don't think that I've ever had to apply a control to a volume of material... so I'm not sure the correct term to use.

VOLUME? REGION? ZONE? AREA?

Is there an ASME specification which would describe which terms are appropriate for a technical drawing?

 

[Burunduk]

I think that in the context of a drawing specification, it would still be called an area. As an example induction hardening applies to some depth into the material so essentially it is also a volume being controlled for some material property. Nevertheless the term used in the product definition standards is still an area.
See the following figure from ASME Y14.5-2009 and its title.

 

[chez311]

I too think a limited length/area designation would fit. It could be modified with a note stating that it applies for the full depth, or a specified depth depending on your needs (as noted above - similar to an induction hardening specification).

 

[flash3780]

Thank you for following up.

The induction hardening example seems the most relevant. I noticed that they say "length or area" in the title.

Area seems like it would apply to a surface, which is appropriate for most controls. Shot peening is applied to a surface, though the effect has some depth... So area makes sense there.

Perhaps "LENGTH A" would be more appropriate?

 

[Burunduk]

Perhaps "LENGTH A" would be more appropriate?

Quite possible. Or maybe you can simply specify the material property / metallurgical treatment itself near the length dimension instead of "REGION A" in your graphic, or with a leader pointing to the chain line - like in the standard's example? Is it a lengthy text?

By the way, I think that a chain line is more appropriate in your case than cross-hatching. Cross-hatching a cylindrical area like that is usually associated with a datum target.