ASME Y14.8-2009 pdf download.Castings, Forgings, and Molded Parts Engineering Drawing and Related Documentation Practices.
1.8 DEFINITIONS The following terms are def ned as their use applies in this Standard. Other commonly used casting/forging/molded part terms are def ned in Nonmandatory Appendix A. 1.8.1 Casting casting: a part obtained by solidif cation of material in a die or mold. 1.8.2 Corner Radius (Edge Radius) corner radius (edge radius): the convex radius on the sur- face of a part connecting two surfaces (see Fig. 1-1). 1.8.3 Die die: any of various tools or devices for imparting a desired shape, form, or f nish to a material or for impressing an object or material. 1.8.4 Die Closure die closure: allowable part variation caused by inconsis- tent mating of opposing segments of a mold or die (see Fig. 3-2). 1.8.5 Draft draft: the taper given to a part so that it can be withdrawn from the mold or die (see Fig. 3-1). 1.8.6 Drawing drawing: an engineering document or digital data f le(s) that discloses (directly or by reference), by means of graphic or textual presentations, or by combinations of both, the physical or functional requirements of an item (ASME Y14.100).
1.8.7 Fillet Radius f llet radius: the concave radius on the surface of a part connecting two surfaces (see Fig. 1-1). Fillet radii are intended to minimize stress concentrations, aid in proper f ll, and minimize cosmetic defects. 1.8.8 Flash f ash: excess material that results from leakage between mating surfaces of a mold or die (see Fig. 3-10). 1.8.9 Flash Extension f ash extension: allowable f ash remnant (see Fig. 3-10). 1.8.10 Flatness f atness: a condition of a surface having all elements in one plane. See ASME Y14.5M. 1.8.11 Forging forging: a part created by plastically deforming metal. Also, the process by which metal is plastically deformed to a desired shape. 1.8.12 Forging Plane forging plane: a plane perpendicular to the forging direction. It normally coincides with the principal mating faces of a set of dies. See Fig. 3-3. 1.8.13 Gate gate: a channel in a mold through which molten material f ows into the mold cavity. 1.8.14 Grain Direction grain direction: the predominant orientation of the f brous crystalline structural units of wrought metals (see Fig. 3-21). 1.8.15 Grain Flow (Flow Lines) grain f ow (f ow lines): the directional elongation in the grain structure of the material, and its nonhomogeneous constituents, resulting from the forging process. Grain f ow follows the direction of working during forging and is usually revealed by polishing and etching sections of the forging. See para. 3.16. 1.8.16 Match Draft match draft: additional draft allowance permitted on matching surfaces at parting lines when the normal draft allowance would result in an offset of the surfaces at the parting line (see Fig. 3-13).
1.8.17 Mismatch mismatch: the offset of features on a part caused by mis- alignment of opposing segments of a mold or die (see Fig. 3-14). 1.8.18 Mold mold: a form made of sand, metal, or other material into which material is poured or injected to produce a part. 1.8.19 Mold Line mold line: a line generated by the theoretical intersection of projected surfaces (see Fig. 3-1). 1.8.20 Movable Targets movable targets: two or more targets with a controlled simultaneous motion used for centering parts (see para. 4.6 and Figs. 4-3, 4-12, and 4-13). 1.8.21 Parting Line parting line: (a) the separation between the mold or die segments. (b) a line on the drawing representing the mating sur- faces of the die or mold segments. See Figs. 3-2, 3-15, 3-16, and C-2. 1.8.22 Parting Plane parting plane: a plane representing the mating surfaces of the die or mold. 1.8.23 Pattern pattern: a form made of wood, metal, or other material around which sand or other suitable material is placed to make a mold.
1.8.27 Sink sink: a shallow depression in the surface of a cast or molded part, due to internal shrinkage in region of greater, or excessive, thickness. 1.8.28 Straightness straightness: a condition where an element of a surface or an axis is a straight line (ASME Y14.5M). 1.8.29 Vent Marks vent marks: small protrusions on the surface of a part caused by material entering the vents (air escape pas- sages) in the mold or die. 1.8.30 Wall wall: a solid feature at any physical orientation com- posed of opposing surfaces having a nominally uniform thickness (see Fig. 3-24). 1.8.31 Wall Thickness wall thickness: the actual local size between all sets of opposing points on the surfaces of a wall (see Fig. 3-24).