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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Radii Tolerances relate to all fillet radii and corner radii. Greatest Length mm x Die Wear Tolerance factor. Over 30 to 50 incl.

Weights of Forgings after Trimming, in Pounds. See examples 5 and 6. Greatest dimension x Straightness Tolerance. Straightness Tolerances are applied independently of, and in addition to, all other tolerances. Appropriate value from Table V. Die Closure Tolerances relate to variations in thickness of forgings as affected by the closing of yolerance dies and die wear, and pertain to variations in dimensions crossing the fundamental parting line.

Block-type forgings with neither length, width. The Protrusion is checked against a line perpendicular to the plane forgung for checking the flat portion: These include, cold and warm coining to achieve closer thickness tolerances, using special pressure padded trimmers for improving straightness, cold sizing of holes for improved tolerances on ttolerance pierced holes, and warm forging as a manufacturing process.

9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association

Over 65 to x Greatest Length x Die Wear Tolerance factor. It is important that forging drawing be accurate and complete. The male portions of dies may, in special situations, tend to mushroom or upset rather than wear.


The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed. The experience of producers and purchasers of forged parts and products indicates that the tolerances set forth herein will provide adequate dimensional accuracy for most applications.

Largest Diameter mm x Die Wear Tolerance factor. Length x Die Wear Tolerance factor. Draft Angle Tolerances toleerance to all draft angles, specified on drawings that are not affected by subsequent operations. Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise.

Over Over 0.

Is.3469.1-3.1974 Die Steel Forging Standard

Furthermore, unless the purchaser’s drawings or specifications direct otherwise, circular shapes are normally assumed to be figures of revolution with a center on an axis, and all circular dimensions are normally shown as diameters. Over 10 to 30 incl. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet.

Flash Extension Tolerances are based on weight of the forging after trimming, and related to the amount of flash extension.

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.

This tolerance guide provides dimensioning and tolerancing that is considered linear and not geometric. Straightness Tolerances are expressed as decimal inch, in units of 0. Allowances for die wear occuring on dimensions measured perpendicular to the fundamental parting line of the dies are included in Die Closure Tolerances Table II.


Is Die Steel Forging Standard – Free Download PDF

Flash is measured from the body of the forging to the trimmed edge of the flash. Die wear varies according to the material that is forged and the shape of the forging. This tolerance is in addition to the Die Closure Tolerance. This will assist in the design of forging dies and tools, and in establishing effective inspection procedures. There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations.

Where surfaces of forgings are intended for use in “as forged” condition, surface imperfections are commonly permitted as shown in Table VI. Where purchaser specified stock for machining, these imperfections are commonly tolreance to within 1.

Forging dimensions are commonly analyzed independently, with consideration given to all applicable tolerances including match, straightness, length and width but not including die wear. Extremity Tolerances relate to variations in height of protrusions steps which are perpendicular to the fundamental parting line and are independent of die closure, die wear and other factors dealt with in this book.

Match Tolerances are expressed as decimal millimeter in units of 0. It is equally toperance that the purchaser provide drawings of the finish machined part, or equivalent information.

This tolerance applies only to steps that are contained in one die. Diameter x Die Wear Tolerance factor. Largest Diameter x Die Wear Tolerance factor. Tolerance on External Dimension.