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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Over 30 to 50 incl. Unless the purchaser’s drawings and specifications direct otherwise, all dimensions are normally assumed to refer to lines intersecting at right angles to each other commonly referred to as X, Y, and Z axes.

Is.3469.1-3.1974 Die Steel Forging Standard

The minimum should be plus or minus 0. Over 50 to incl. See Table II, below. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet. The Straightness Tolerance on fprging protrusion is 0. There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations. Minimum Finish Stock Per Surface. Be sure to contact technical personnel at your forging source for help in determining such special capabilities.

Straightness Tolerances are applied independently of, and in addition to, all other tolerances.

IS 3469-1 to 3: Tolerances for Closed Die Steel Forgings

The following procedures will apply concerning dimensioning on forging drawings: Flash is measured from the body of the forging to the trimmed edge of the flash. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information.

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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.

Where possible, measurements are made at areas of the forging unaffected fkrging die wear. Radii Tolerances are expressed as decimal millimeter in units of 0.

Appropriate value from Table V. Greatest Length x Die Wear Tolerance factor. From the highest to lowest point of contour. Largest Diameter mm x Die Wear Tolerance factor. Greatest dimension x Straightness Tolerance. Largest Diameter x Die Wear Tolerance factor. Radii Tolerances relate to all fillet radii and corner radii.

Where purchaser specified stock for machining, these imperfections are commonly permitted to within 1. Match Tolerances are based on weight of the forging after trimming and are expressed as decimal inch or decimal millimeters according to Table III, below.

Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise. This tolerance guide provides dimensioning and tolerancing that is considered linear and not geometric.

Area at the Trim Line Flash not included, expressed in foorging inches. Where tolerances are desired, agreement si purchaser and forging producer is normally reached before production proceeds.


Is Die Steel Forging Standard – Free Download PDF

Area at the Trim Line Flash not included, expressed in square millimeters. Greatest Length mm x Die Wear Tolerance factor. Theoretical exactness is seldom attained, and it is therefore necessary to make allowance for deviations. The male portions of dies may, in special situations, tend to mushroom or upset rolerance than wear.

Tolerance on Length Dimension. Ttolerance Protrusion is checked against a line perpendicular to the plane established for checking the flat portion: Over 10 to 30 incl. Radii Tolerances are plus or minus one-half the specified radii, except where corner radii are affected by subsequent removal of draft by trimming, broaching or punching.

Die Wear Tolerances for all length, width and diameter dimensions over mm or 30 in.

Die Wear Tolerances do not apply on center-to-center dimensions. In such cases, the requirements of the forging should be confirmed by purchaser and producer in advance of production. Over to x