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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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. All individual tolerances apply to each and every forged part unless specifically noted otherwise.
It is important that forging drawing be accurate and complete. Greatest dimension x Straightness Tolerance. See Table II, below. 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 male portions of dies may, in special situations, tend to mushroom or upset rather than wear.
Is Die Steel Forging Standard – Free Download PDF
The tolerances set forth herein tolerajce 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.
The Straightness Tolerance on a protrusion is 0. Be sure to contact technical personnel at your forging source for help in determining such special capabilities. Straightness Tolerances are applied independently of, and in addition to, all other tolerances.
IS 3469-1 to 3: Tolerances for Closed Die Steel Forgings
Diameter mm x Die Wear Tolerance factor. Dressouts, scale pits and other forgingg are commonly allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise. Where possible, measurements are made at areas of the forging unaffected by die wear. Diameter x Die Wear Tolerance factor.
Greatest Length x Die Wear Tolerance factor. From the highest to lowest point of contour.
Is.3469.1-3.1974 Die Steel Forging Standard
See Figures 8 and Example Die Wear Tolerances on internal dimensions are expressed as minus values only. In such cases, the requirements of the forging should be confirmed by purchaser and producer in advance of production. Over to x Straightness Tolerances are expressed as decimal inch, in units of 0.
Where purchaser specified stock for machining, these imperfections are commonly permitted to within 1. Tolerance on Length Dimension. The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed.
Unless the purchaser’s drawings and specifications direct otherwise, all dimensions are normally assumed to refer to lines intersecting at right angles to each other commonly referred to as X, Y, and Z axes.
This tolerance applies only to steps that are contained in one die.
Flash Extension Tolerances are expressed as decimal inch, in units of 0. Over 65 to x 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.
Greatest Length mm x Die Wear Tolerance factor. Normally, they are in addition to tolerances for die wear. Area at the Trim Line Flash not included, expressed in square millimeters. This tolerance is in addition to the Die Closure Tolerance.
The degree of precision attainable in the manufacture ix forged parts or products is tollerance by the essential character of forging equipment and unavoidable contingencies in forging operations. Draft Angle Tolerances apply to all draft angles, specified on drawings that are not affected by subsequent operations. Tolerance on Internal 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.
Area at the Trim Line Flash not included, expressed in square inches. Die Closure Tolerances are expressed decimal millimeter in units of 0. Die wear varies according to the material that is forged and the shape of the forging. Radii Tolerances relate to all fillet radii and corner radii. This document more closely interprets fofging needed dimensional and tolerance modifications for forgings discussed in this booklet.