IS 3469 FORGING TOLERANCE PDF

Akisida Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless to,erance specification or drawing states otherwise. See examples 7 and 8. This tolerance guide provides dimensioning and tolerancing that is considered linear and not geometric. 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. 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. The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed.

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Akisida Dressouts, scale pits and other imperfections are commonly allowed on surfaces to be finish machined unless to,erance specification or drawing states otherwise. See examples 7 and 8. This tolerance guide provides dimensioning and tolerancing that is considered linear and not geometric. 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. 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.

The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed. The minimum should be plus or minus 0. Area at the Trim Line Flash not included, expressed in square millimeters. 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. From the highest to lowest point of contour.

Tolerance on Length Dimension. 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. IS to 3: Tolerances for Closed Die Steel Forgings Giving consideration to the fact that forgings undergo dimensional changes due to cooling and because forgings are formed in most forgging between two impression dies that are not precisely on the same centerline, the ANSI Ofrging 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.

Radii Tolerances are expressed as decimal millimeter in units of 0. This will assist in the design of forging dies and tools, and in establishing effective inspection procedures. Diameter mm x Die Wear Tolerance factor.

This tolerance includes allowances for: Straightness Tolerances are applied independently of, and in addition to, all other tolerances. This tolerance is in addition to the Die Closure Tolerance. Die Closure Tolerances are expressed decimal millimeter in units of 0. Over 10 to 30 incl. This tolerance includes allowance for shrinkage, die sinking and die polishing variations.

See examples 5 and 6. Die Wear Tolerances for all length, width and diameter dimensions over mm or 30 in. Finish allowance refers to the amount of material that is to be machined from the forging to obtain the finished part. Flash Extension Tolerances are expressed as decimal inch, in units of 0. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information. Tolerance on External Ofrging. Greatest Length mm x Die Wear Tolerance factor.

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IS 3469 FORGING TOLERANCE PDF

Tygoll 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. Decimals used in computing tolerances are totaled and raised to the next highest 0. 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. Allowances for die wear occuring on dimensions measured perpendicular to the fundamental parting line of the dies toldrance included in Id Closure Tolerances Table II. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information.

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Length x Die Wear Tolerance factor. It is important that forging drawing be accurate and complete. Block-type forgings with neither length, width. Tolerance on Internal Dimension.

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Kazrat Tolerance on Length Dimension. Diameter mm x Die Wear Tolerance factor. See Table II, below. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information.

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