ASME Y14.8M:1996 pdf download CASTINGS AND FORGINGS
1.1 General This Standard covers definitions of terms and features unique to casting and forging technologies with recom- mendations for their uniform description and inclusion on engineering drawings and related documents. Unless otherwise specified, any reference to features, parts or processes shall be interpreted as applying to both cast- ings and forgings. Castings and forgings are delineated as casting/forging throughout the Standard.
1.1.1 Units. The International System of Units (SI) is used in this Standard because SI units are expected to supersede United States (U.S.) customary units. Customary units could equally well be used without prejudice to the principles established.
1 .1 .2 Reference to This Standard. Where draw- ings are based on this Standard, this fact shall be noted o n the drawings or in a document referenced on the drawings. References to this Standard shall state “ASME Y 14.8M-1996.”
1.1.3 Figures. The Figures in this Standard are intended only as illustrations to aid the user in undcr- standing the principles and methods of drawing de- scribed in the text. The absence of a Figure illustrating the desired application is neither reason to assume inapplicability nor basis for drawing rejection. In some instances, Figures show added detail for emphasis; in other instances, Figures are incomplete by intent. Numerical values of dimensions and tolerances are illustrative only.
1.1.4 Notes. Notcs hercin in capital letters are intended to appear on drawings. Notes in lower case are explanatory only and are not intended to appear on drawings.
1.1.5 Dimensioning and Tolerancing. The methods of dimensioning and tolerancing shall be in accordance with ASME Y14.5M and this Standard.
1.2 References Where the following American National Standard referred to in this Standard is superseded by a revision approved by the American National Standards Institute, the revision shall apply.
ASME Y14.5M-1994，Dimensioning and Tolerancing.
1.3 Definitions
The following terms are defined as their use appliesin this Standard. Other commonly used casting/forgingterms are defined in Appendix A.
corner radius (edge radius): the convex radius onthe surface of a part connecting intersecting surfaces(see Fig. 1-1)
die closure: allowable part thickness variation causedby inconsistent mating of opposing segments of a moldor die (see Fig. 3-1)
draft: the taper (angle) applied to selected surfacesto aid in the removal of a part from a die or a patternfrom a mold (see Fig. 3-2)
dress out: a localized depression on the surface of aforging that results when abrasive tools are used toremove surface discontinuities
fillet radius: the concave radius on the surface of apart connecting intersecting surfaces (see Fig. l-l)
flash: excess material which results from leakage be-tween mating surfaces of a mold or die (see Fig. 3-4)flatnes: a condition of a surface having all elementsin one plane (refer to ASME Y14.5M)
forging plane: a plane perpendicular to the forgingdirection. [t normally coincides with the principal matingfaces of a set of dies (sce Fig. 3-3)
gate: a channel in a mold through which moltenmaterial flows into the mold cavity