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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This will assist in the design of forging dies si tools, and in establishing effective inspection procedures. Flat and thin with protrusion at right angles to the parting line. Extremity Tolerances are expressed as decimal millimeter in units of 0. All individual tolerances apply to each and every forged part unless specifically noted otherwise. This tolerance includes allowances for: There are toldrance special ways of providing closer tolerances on selected dimensions on forgings with added operations.
Match Tolerances are expressed as decimal millimeter in units of 0.
IS 3469-1 to 3: Tolerances for Closed Die Steel Forgings
Where surfaces of forgings are intended for use in “as forged” condition, surface imperfections are commonly permitted as shown in Table VI. The minimum should be plus or minus 0.
Block-type forgings with neither length, width. Decimals used in computing tolerances are forgnig and tolerabce to the next highest 0. Greatest Length mm x Die Wear Tolerance factor.
Diameter mm x Die Wear Tolerance factor. Weights of Forgings After Trimming, in kilograms. 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.
Where possible, measurements are made at areas of the forging unaffected by die wear. 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.
Normally, they are in addition to tolerances for die wear. Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise. Tolerance on Internal Dimension. The Tolerance on flat portion is computed first: The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed.
Raised to the next highest 0. The male portions of dies may, in special situations, tend to mushroom or upset rather than forgnig. Weights of Forgings after Trimming, in Pounds.
Is Die Steel Forging Standard – Free Download PDF
This tolerance applies only to steps that are contained in one die. Theoretical exactness is seldom attained, and it is therefore necessary to holerance allowance for deviations. 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.
Experience within the industry shows that dimensional forginv in forging are commonly functions of the dimensions involved, and the tolerances herein are based upon this observed fact.
Draft Angle Tolerances apply to all draft angles, specified on drawings id are not affected by subsequent operations. Flash Extension Tolerances are based on weight of the forging after trimming, and related to the amount of flash extension. Greatest Length x Die Wear Tolerance factor. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information. Over to incl.
The Protrusion is checked against a line perpendicular to the plane established for checking the flat portion: 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.