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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Greatest Length x Die Wear Tolerance factor. 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.
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 tolreance shown as diameters. Diameter mm x Die Wear Tolerance factor.
Diameter x Die Wear Tolerance factor. Finish allowance refers to the amount of material that is to be machined from the forging to obtain the finished part.
Block-type forgings with neither length, width. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet. There are practical limitations in dimensions and other characteristics of forged parts or products which vary according to the part or product and the producer’s equipment.
Flat and thin with protrusion at right angles to the parting line.
Is.3469.1-3.1974 Die Steel Forging Standard
Over 65 to x Forging dimensions are commonly analyzed independently, with consideration given to all applicable tolerances including match, straightness, length and width but not including die wear.
Weights of Forgings after Trimming, in Pounds. 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.
Length mm x Die Wear Tolerance factor. Largest Diameter mm x Die Toleramce Tolerance factor. Decimals used in computing tolerances are totaled and raised to the next highest 0.
Is Die Steel Forging Standard – Free Download PDF
In cases where measurements for determining match forginb must be made from surfaces of the forging where uneven wearing of the dies has caused surplus stock, accuracy depends on making the proper allowances for these wear-caused surpluses, and eliminating their influence from the computation.
This tolerance applies only to steps that are contained in one die. Where possible, measurements are made at areas of the forging unaffected by die wear. This tolerance includes allowances for: Largest 346 x Die Wear Tolerance factor. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information.
Match Tolerances are expressed as decimal millimeter in units of 0. Flash Extension Tolerances are expressed as decimal inch, in units of 0. The Protrusion is checked against a line perpendicular to the plane established for checking the flat portion: Weights of Forgings After Trimming, in kilograms.
Radii Tolerances are expressed as decimal millimeter in units of 0. From the highest to lowest point of contour. Straightness Tolerances are applied independently of, tokerance in addition foeging, all other tolerances.
Flash is measured from the body of the forging to the trimmed edge of the flash. The minimum should be plus or minus 0. Straightness Tolerances are expressed as decimal inch, in units tolersnce 0. 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.
Over Over 0.