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.
|Published (Last):||10 October 2007|
|PDF File Size:||20.3 Mb|
|ePub File Size:||7.40 Mb|
|Price:||Free* [*Free Regsitration Required]|
It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information. All individual tolerances apply to each and every forged part unless specifically noted otherwise.
Block-type forgings with neither length, width. Where purchaser specified stock for machining, these imperfections os commonly permitted to within 1. 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 tolerznce.
Decimals used in computing tolerances are totaled and raised to the next highest 0. Area at the Trim Line Flash not included, expressed in square inches.
Radii Tolerances are expressed as decimal millimeter in units of 0. Weights of Forgings After Trimming, in kilograms. Straightness Tolerances are expressed as decimal inch, in units of 0. 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.
IS 3469-1 to 3: Tolerances for Closed Die Steel Forgings
The Protrusion is checked against a line perpendicular to the plane established for checking the flat portion: 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 surpluses, and eliminating their influence from the computation.
Flat and thin with protrusion at right angles to the parting line. Straightness Tolerances are applied independently of, and in addition to, all other tolerances.
Where surfaces of forgings are intended for use in “as forged” condition, surface imperfections are commonly permitted as shown in Table VI. Die Closure Tolerances relate to variations in thickness of forgings as affected by the forgging of the dies and die wear, and pertain to variations in dimensions crossing the fundamental parting line. Flash Extension Tolerances are expressed as decimal inch, in units of 0. Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise.
This will assist in the design of forging dies and tools, and in establishing effective inspection procedures. Over Over 0.
9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association
Draft Angle Tolerances apply to all draft angles, specified on drawings that are not affected by subsequent operations.
Over 30 to 50 incl. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet. 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
There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations. Raised to the next highest 0. Tolefance Finish Stock Per Surface. This tolerance guide provides dimensioning and tolerancing that is considered linear and not geometric.
Over 65 to x 33469 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. Tolerance on Length Dimension. Diameter mm x Die Wear Tolerance factor. Area at the Trim Line Flash not included, expressed in square millimeters.
Is.3469.1-3.1974 Die Steel Forging Standard
Die wear varies according to the material that is forged and the shape of the forging. Length x Die Wear Tolerance factor. Over to incl. See Figures 8 and Example This tolerance applies only to steps that are contained in one die.
This tolerance is in addition to the Die Closure Tolerance. 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.
Match Tolerances are expressed as decimal millimeter in units of 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.