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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Appropriate value from Table V. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information. The male portions of dies may, in special situations, tend to mushroom or upset rather than wear.
Weights of Forgings after Trimming, in Pounds. Die Closure Tolerances on forgings are based on the projected area of the forging at the trim line, not including flash, but including all areas to be subsequently punched out, and are applied as plus tolerances only. Block-type forgings with neither length, width.
Minimum Finish Stock Per Surface. Where possible, measurements are made at areas of the forging unaffected by die wear. 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.
Radii Tolerances are expressed as decimal millimeter in units of 0. The Straightness Tolerance on a protrusion is 0.
9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association
See Figures 8 and Example The Protrusion is checked against a line perpendicular to the plane established for checking the flat portion: Be sure to contact technical personnel at your forging source for help in determining such special capabilities.
Finish allowance refers to the amount forigng material that is to be machined from the forging to obtain the finished part. Die Wear Tolerances for all length, width and diameter dimensions over mm or 30 in. Over to x 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.
Largest Length x Die Wear Tolerance factor.
Is.3469.1-3.1974 Die Steel Forging Standard
Theoretical exactness is seldom attained, and it is therefore necessary to make allowance for deviations. 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.
Greatest Length x Die Wear Tolerance factor. From the highest to lowest point of contour. 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. Over to incl. The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed.
Is Die Steel Forging Standard – Free Download PDF
Radii Tolerances relate to all fillet radii and corner radii. 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. Tolerance on External Dimension. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet.
Die Wear Tolerances do not apply on center-to-center dimensions. Straightness Tolerance applied to flat portion. Area at the Ks Line Flash not included, expressed in square millimeters.
The Tolerance on flat portion is computed first: Diameter mm x Die Wear Tolerance factor. Where purchaser specified stock for machining, these imperfections are commonly permitted to within 1. Area at the Trim Line Flash not included, expressed in square inches. In cases where measurements for determining match tolerances must be made from surfaces of the forging where forgihg 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.
Over 10 to 30 incl. Diameter x Die Wear Tolerance factor. Die Closure Tolerances relate to variations in thickness of forgings as affected by the closing of the dies and die wear, and forgung to variations in dimensions crossing the fundamental parting line. Match Tolerances are expressed as decimal millimeter in units of 0.