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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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. Flat and thin with protrusion at right angles to fogring parting line. Normally, they are in addition to tolerances for die wear. Appropriate value from Table V.

All individual tolerances apply to each and every forged part unless specifically noted otherwise. Over 30 to 50 incl. This will assist in the design of forging dies and tools, and in establishing effective inspection procedures. Decimals used in computing tolerances are totaled and toerance to the next highest 0. See examples 5 and 6. Length mm x Die Wear Tolerance factor.

This tolerance includes allowances for: Extremity Tolerances are expressed as decimal millimeter in units of 0. Over Over 0. The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed. 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 toleranve dimensions crossing the fundamental parting line.

Greatest Length x Die Wear Tolerance factor. 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. This tolerance applies only to steps that are contained in one die. Theoretical exactness is seldom attained, and it is therefore necessary to make allowance for deviations.

Experience within the industry shows that dimensional variations in forging are commonly functions of the dimensions involved, and the tolerances herein are based upon this observed fact. 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.

Die Wear Tolerances do not apply on center-to-center dimensions. Raised to the next highest 0. Where possible, measurements are made at areas of the forging unaffected by die wear. The following procedures will apply concerning dimensioning on forging drawings: 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.

Diameter x Die Wear Tolerance factor. Die wear varies according to the material that is forged and the shape of the forging. Diameter mm x Die Wear Tolerance factor. It is important that forging drawing be accurate and complete. TOP Related Posts.

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IS 3469 FORGING TOLERANCE PDF

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. Largest Diameter mm x Die Wear Tolerance factor.

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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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Dokora 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 uneven wearing of the dies has caused surplus stock, accuracy depends on forgging the proper allowances for these wear-caused surpluses, and eliminating their influence from the computation. Where tolerances are desired, agreement between purchaser and forging producer toleraance normally reached before production proceeds. Largest Diameter x Die Wear Tolerance factor. Where purchaser specified stock for machining, these imperfections are commonly permitted to within 1. Theoretical exactness is seldom attained, and it is therefore necessary to make allowance for deviations. Greatest Length x Die Wear Tolerance factor.

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