The tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements . Is Die Steel Forging Standard – Download as PDF File .pdf), Text File .txt) or read IS to 3 (): Tolerances for Closed Die Steel. Resource for typical forging tolerances with impression die forgings.
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In such cases, the requirements of the forging should be confirmed by purchaser and producer in advance of production. It is important toperance forging drawing be accurate and complete. The tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements of forgings produced under normal operating conditions on standard forging equipment.
The minimum should be plus or minus 0. Die Wear Tolerances for all length, tolfrance and diameter dimensions over mm or 30 in. Decimals used in computing tolerances are totaled and raised to the next highest 0. Straightness Tolerance applied to flat portion. Surface Tolerances relate to depth of dressouts, scale pits and other imperfections on the surface of forgings.
Block-type forgings with neither length, width.
Is.3469.1-3.1974 Die Steel Forging Standard
This tolerance is in addition to the Die Closure Tolerance. This tolerance includes allowances for: Forglng Length x Die Wear Tolerance factor. Die Closure Tolerances are expressed decimal millimeter in units of 0.
Straightness Tolerances are expressed as decimal inch, in units of 0. Largest Diameter x Die Wear Tolerance factor. Over to x Theoretical exactness is seldom attained, and it is forfing necessary to make allowance for deviations. Radii Tolerances relate to all fillet radii and corner radii. Appropriate value from Table V. This will assist in the design of forging dies and tools, and in establishing effective inspection procedures.
The Tolerance on tolerancce portion is computed first: Normally, they are in addition to tolerances for die wear. Radii Tolerances are expressed as decimal millimeter in units of 0.
Flat and thin with protrusion at right angles to the parting line.
Over Over 0. Forginy x Die Wear Tolerance factor. Weights of Forgings after Trimming, in Pounds. Die Closure Tolerances relate to variations in thickness of forgings as affected by the closing of the dies and die wear, and pertain to variations in dimensions crossing the fundamental parting line.
The male portions of dies may, in special situations, forgjng to mushroom or upset rather than wear. The Straightness Tolerance on a protrusion is 0.
9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association
Tolerance on Length Dimension. Tolerance on Internal Dimension. Giving consideration to the fact that forgings undergo dimensional changes due to cooling and because forgings are formed in most cases between two impression dies that are not precisely on the same centerline, the ANSI Y Largest Diameter mm x Die Wear Tolerance factor. Die Wear Tolerances on internal dimensions are expressed as minus values only. Length mm x Die Wear Forfing factor.