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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These include, cold and warm coining to achieve closer thickness tolerancf, using special pressure padded trimmers for improving straightness, cold sizing of holes for improved tolerances on hot pierced holes, and warm forging as a manufacturing process.
It is important that forging drawing be accurate and complete.
Over to x Over 10 to 30 incl. Die Closure Tolerances are expressed decimal millimeter in units of 0. There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations. Over 30 to 50 incl. Tolerance on Internal Dimension. In such cases, the requirements of the forging should be confirmed by purchaser forgin producer in advance of production.
Length mm x Die Wear Tolerance factor. The minimum should be plus or minus 0.
9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association
Area at the Trim Line Flash not included, expressed in square inches. Raised to the next highest 0. Die Wear Tolerances do not apply on center-to-center dimensions. Minimum Finish Stock Per Surface. Straightness Tolerance applied to flat portion. Appropriate value from Table V. See examples 7 and 8. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information. Greatest Length x Die Forgong Tolerance factor.
Flash is rolerance from the body of the forging to the trimmed edge of the flash. In cases where measurements for determining match tolerances 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 34669, and eliminating their influence from the computation.
Is.3469.1-3.1974 Die Steel Forging Standard
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. The following procedures will apply concerning dimensioning on forging drawings: Tolerancce on External Dimension. 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. Be sure to contact technical personnel at your forging source for help in determining such special capabilities.
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.
Flash Extension Tolerances are expressed as decimal inch, in units of 0. See examples 5 and 6. This tolerance includes allowance for shrinkage, die sinking and die polishing variations.
Is Die Steel Forging Standard – Free Download PDF
Normally, they are in addition to tolerances for die wear. 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. Block-type forgings with neither length, width.
Diameter x Die Wear Tolerance factor.
Over 65 to x The Tolerance on flat portion is computed first: Experience within the industry shows that dimensional variations in forging are commonly functions of the dimensions involved, and the tolerances herein are based tolerajce this observed fact. Die wear varies according to the material that is forged and the shape of the forging. Tolerances in this publication are expressed in decimal inch with metric equivalents sometimes referred to as “soft” metric conversion in the belief that this represents a practice most common in the industry at the time of publication.
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. The degree of precision attainable in the manufacture of forged parts or products is dictated by the essential character of forging equipment and unavoidable contingencies in forging operations.